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        "label": "Net Increase (Decrease) in Sales and Transfer Prices and Production Costs",
        "description": "Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of change in sales and transfer prices and in production (lifting) costs related to future production.",
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              "end": "2017-12-31",
              "val": 2236183000,
              "accn": "0000033213-19-000006",
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              "form": "10-K",
              "filed": "2019-02-14"
            },
            {
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              "filed": "2019-02-14"
            },
            {
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            },
            {
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              "frame": "CY2020"
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              "val": 17290913000,
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              "filed": "2022-02-10"
            },
            {
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              "val": 17290913000,
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              "fy": null,
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            {
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              "val": 17290913000,
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              "form": "10-K",
              "filed": "2023-02-16"
            },
            {
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              "val": 17290913000,
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              "val": 35353172000,
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              "form": "10-K",
              "filed": "2023-02-16"
            },
            {
              "start": "2022-01-01",
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              "val": 35353172000,
              "accn": "0000033213-24-000008",
              "fy": 2023,
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              "form": "10-K",
              "filed": "2024-02-14"
            },
            {
              "start": "2022-01-01",
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              "val": 35353172000,
              "accn": "0000033213-25-000011",
              "fy": 2024,
              "fp": "FY",
              "form": "10-K",
              "filed": "2025-02-19",
              "frame": "CY2022"
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            {
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            {
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              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2023"
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            {
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              "form": "10-K",
              "filed": "2025-02-19"
            },
            {
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              "val": -1237271000,
              "accn": "0000033213-26-000018",
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              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2024"
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            {
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              "accn": "0000033213-26-000018",
              "fy": 2025,
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              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2025"
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          ]
        }
      },
      "ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy": {
        "label": "Proved Developed and Undeveloped Reserve, Extension and Discovery (Energy)",
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              "val": 68,
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              "fp": "FY",
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              "filed": "2019-02-14",
              "frame": "CY2016"
            },
            {
              "start": "2017-01-01",
              "end": "2017-12-31",
              "val": 477,
              "accn": "0000033213-19-000006",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-14"
            },
            {
              "start": "2017-01-01",
              "end": "2017-12-31",
              "val": 477,
              "accn": "0000033213-20-000008",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-27",
              "frame": "CY2017"
            },
            {
              "start": "2018-01-01",
              "end": "2018-12-31",
              "val": 148,
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              "fy": 2018,
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              "form": "10-K",
              "filed": "2019-02-14"
            },
            {
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              "accn": "0000033213-20-000008",
              "fy": 2019,
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              "form": "10-K",
              "filed": "2020-02-27"
            },
            {
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              "val": 148,
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              "fy": 2020,
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              "form": "10-K",
              "filed": "2021-02-17",
              "frame": "CY2018"
            },
            {
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              "accn": "0000033213-21-000006",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2021-02-17"
            },
            {
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              "end": "2020-12-31",
              "val": 2096,
              "accn": "0000033213-22-000007",
              "fy": 2021,
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              "form": "10-K",
              "filed": "2022-02-10"
            },
            {
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            },
            {
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            {
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            },
            {
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              "filed": "2023-02-16"
            },
            {
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              "filed": "2024-02-14",
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            },
            {
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              "filed": "2025-02-19",
              "frame": "CY2022"
            },
            {
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            {
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              "filed": "2025-02-19"
            },
            {
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            },
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              "fy": 2024,
              "fp": "FY",
              "form": "10-K",
              "filed": "2025-02-19"
            },
            {
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              "end": "2024-12-31",
              "val": 157,
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              "fp": "FY",
              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2024"
            },
            {
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              "end": "2025-12-31",
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              "accn": "0000033213-26-000018",
              "fy": 2025,
              "fp": "FY",
              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2025"
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          ],
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              "form": "10-K",
              "filed": "2025-02-19",
              "frame": "CY2022"
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            {
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            {
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              "form": "10-K",
              "filed": "2025-02-19"
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            {
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              "form": "10-K",
              "filed": "2026-02-18",
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            {
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              "form": "10-K",
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              "filed": "2019-02-14",
              "frame": "CY2016"
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            {
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              "form": "10-K",
              "filed": "2019-02-14"
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            {
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              "end": "2017-12-31",
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              "form": "10-K",
              "filed": "2020-02-27",
              "frame": "CY2017"
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            {
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              "end": "2018-12-31",
              "val": 4739,
              "accn": "0000033213-19-000006",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-14"
            },
            {
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              "val": 4739,
              "accn": "0000033213-20-000008",
              "fy": 2019,
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              "form": "10-K",
              "filed": "2020-02-27"
            },
            {
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              "end": "2018-12-31",
              "val": 4739,
              "accn": "0000033213-21-000006",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2021-02-17",
              "frame": "CY2018"
            },
            {
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              "end": "2019-12-31",
              "val": 2068,
              "accn": "0000033213-20-000008",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-27"
            },
            {
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              "end": "2019-12-31",
              "val": 2068,
              "accn": "0000033213-21-000006",
              "fy": 2020,
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              "form": "10-K",
              "filed": "2021-02-17"
            },
            {
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              "end": "2019-12-31",
              "val": 2068,
              "accn": "0000033213-22-000007",
              "fy": 2021,
              "fp": "FY",
              "form": "10-K",
              "filed": "2022-02-10"
            },
            {
              "start": "2019-01-01",
              "end": "2019-12-31",
              "val": 2068,
              "accn": "0000033213-22-000015",
              "fy": null,
              "fp": null,
              "form": "8-K",
              "filed": "2022-04-28",
              "frame": "CY2019"
            },
            {
              "start": "2020-01-01",
              "end": "2020-12-31",
              "val": 3446,
              "accn": "0000033213-21-000006",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2021-02-17"
            },
            {
              "start": "2020-01-01",
              "end": "2020-12-31",
              "val": 3446,
              "accn": "0000033213-22-000007",
              "fy": 2021,
              "fp": "FY",
              "form": "10-K",
              "filed": "2022-02-10"
            },
            {
              "start": "2020-01-01",
              "end": "2020-12-31",
              "val": 3446,
              "accn": "0000033213-22-000015",
              "fy": null,
              "fp": null,
              "form": "8-K",
              "filed": "2022-04-28"
            },
            {
              "start": "2020-01-01",
              "end": "2020-12-31",
              "val": 3446,
              "accn": "0000033213-23-000008",
              "fy": 2022,
              "fp": "FY",
              "form": "10-K",
              "filed": "2023-02-16",
              "frame": "CY2020"
            },
            {
              "start": "2021-01-01",
              "end": "2021-12-31",
              "val": 3104,
              "accn": "0000033213-22-000007",
              "fy": 2021,
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              "form": "10-K",
              "filed": "2022-02-10"
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            {
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            {
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              "filed": "2023-02-16"
            },
            {
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              "fy": 2023,
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              "form": "10-K",
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              "frame": "CY2021"
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            {
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              "filed": "2023-02-16"
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            {
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              "form": "10-K",
              "filed": "2024-02-14"
            },
            {
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              "val": 2495,
              "accn": "0000033213-25-000011",
              "fy": 2024,
              "fp": "FY",
              "form": "10-K",
              "filed": "2025-02-19",
              "frame": "CY2022"
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            {
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              "form": "10-K",
              "filed": "2024-02-14"
            },
            {
              "start": "2023-01-01",
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              "form": "10-K",
              "filed": "2025-02-19"
            },
            {
              "start": "2023-01-01",
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              "accn": "0000033213-26-000018",
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              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2023"
            },
            {
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              "fy": 2024,
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              "form": "10-K",
              "filed": "2025-02-19"
            },
            {
              "start": "2024-01-01",
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              "val": 3126,
              "accn": "0000033213-26-000018",
              "fy": 2025,
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              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2024"
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            {
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              "fy": 2025,
              "fp": "FY",
              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2025"
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          ]
        }
      },
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        "label": "Proved Developed and Undeveloped Reserve, Production (Energy)",
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              "filed": "2019-02-14"
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              "filed": "2020-02-27",
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              "fy": 2018,
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              "filed": "2019-02-14"
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            {
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            {
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            },
            {
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              "val": 2382000,
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              "form": "10-K",
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            {
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            {
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            {
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      },
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            {
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            {
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            {
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            {
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            {
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            {
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            {
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        "label": "Proved Developed and Undeveloped Reserves, Sale of Mineral in Place (Energy)",
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              "filed": "2020-02-27"
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        "label": "Proved Developed and Undeveloped Reserves, Sales of Minerals in Place",
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            {
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              "val": 256663,
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              "fy": 2020,
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              "filed": "2021-02-17"
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            {
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              "filed": "2023-02-16",
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      },
      "ProvedDevelopedReservesVolume": {
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            {
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              "filed": "2024-02-14"
            },
            {
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              "end": "2022-12-31",
              "val": 1728112000,
              "accn": "0000033213-25-000011",
              "fy": 2024,
              "fp": "FY",
              "form": "10-K",
              "filed": "2025-02-19",
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            },
            {
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              "end": "2023-12-31",
              "val": 4006452000,
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              "fy": 2023,
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              "form": "10-K",
              "filed": "2024-02-14"
            },
            {
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              "val": 4006452000,
              "accn": "0000033213-25-000011",
              "fy": 2024,
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              "form": "10-K",
              "filed": "2025-02-19"
            },
            {
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              "val": 4006452000,
              "accn": "0000033213-26-000018",
              "fy": 2025,
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              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2023"
            },
            {
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              "val": 926235000,
              "accn": "0000033213-25-000011",
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              "filed": "2025-02-19"
            },
            {
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              "val": 926235000,
              "accn": "0000033213-26-000018",
              "fy": 2025,
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              "filed": "2026-02-18",
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            },
            {
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              "val": 799914000,
              "accn": "0000033213-26-000018",
              "fy": 2025,
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              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2025"
            }
          ]
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      },
      "StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves": {
        "label": "Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves",
        "description": "Amount of discounted future accumulated cash inflow relating to proved oil and gas reserves.",
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              "filed": "2019-02-14"
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            {
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            {
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              "filed": "2019-02-14"
            },
            {
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            {
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              "filed": "2021-02-17",
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            },
            {
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              "val": 11611898000,
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              "form": "10-K",
              "filed": "2019-02-14"
            },
            {
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              "form": "10-K",
              "filed": "2020-02-27"
            },
            {
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              "filed": "2022-02-10"
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            {
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            {
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            {
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            {
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      },
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        "label": "Proved Developed and Undeveloped Reserve, Net (Energy)",
        "description": "Energy measure of proved reserve of oil and gas, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).",
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              "filed": "2025-02-19"
            },
            {
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            {
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              "filed": "2026-02-18",
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          ]
        }
      },
      "ProvedDevelopedAndUndevelopedReservePurchaseOfMineralInPlaceEnergy": {
        "label": "Proved Developed and Undeveloped Reserve, Purchase of Mineral in Place (Energy)",
        "description": "Energy measure of increase in quantity of proved reserve of oil and gas resulting from purchase of mineral in place, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).",
        "units": {
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            {
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            {
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              "filed": "2026-02-18",
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            {
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              "filed": "2026-02-18",
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      },
      "ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy": {
        "label": "Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy)",
        "description": "Energy measure of increase (decrease) in quantity of proved reserve of oil and gas related to revision of a previous estimate resulting from new information, except for an increase in proved acreage, or change in economic factors, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).",
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            {
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              "accn": "0000033213-25-000011",
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            {
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            {
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            {
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              "form": "10-K",
              "filed": "2026-02-18",
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          ]
        }
      },
      "ProvedDevelopedReservesBOE1": {
        "label": "Proved Developed Reserves (Energy)",
        "description": "Energy measure of interests in proved developed reserves of crude oil, including condensate and natural gas liquids, natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas.",
        "units": {
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              "accn": "0000033213-25-000011",
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              "fp": "FY",
              "form": "10-K",
              "filed": "2025-02-19",
              "frame": "CY2021Q4I"
            },
            {
              "end": "2022-12-31",
              "val": 17513645,
              "accn": "0000033213-25-000011",
              "fy": 2024,
              "fp": "FY",
              "form": "10-K",
              "filed": "2025-02-19"
            },
            {
              "end": "2022-12-31",
              "val": 17513645,
              "accn": "0000033213-26-000018",
              "fy": 2025,
              "fp": "FY",
              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2022Q4I"
            },
            {
              "end": "2023-12-31",
              "val": 19558176,
              "accn": "0000033213-25-000011",
              "fy": 2024,
              "fp": "FY",
              "form": "10-K",
              "filed": "2025-02-19"
            },
            {
              "end": "2023-12-31",
              "val": 19558176,
              "accn": "0000033213-26-000018",
              "fy": 2025,
              "fp": "FY",
              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2023Q4I"
            },
            {
              "end": "2024-12-31",
              "val": 18804929,
              "accn": "0000033213-25-000011",
              "fy": 2024,
              "fp": "FY",
              "form": "10-K",
              "filed": "2025-02-19"
            },
            {
              "end": "2024-12-31",
              "val": 18804929,
              "accn": "0000033213-26-000018",
              "fy": 2025,
              "fp": "FY",
              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2024Q4I"
            },
            {
              "end": "2025-12-31",
              "val": 20580992,
              "accn": "0000033213-26-000018",
              "fy": 2025,
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              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2025Q4I"
            }
          ]
        }
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      "AssetsHeldForSaleCurrent": {
        "label": "Assets Held-for-sale, Current (Deprecated 2014-01-31)",
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            {
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      "AssetsOfDisposalGroupIncludingDiscontinuedOperation": {
        "label": "Disposal Group, Including Discontinued Operation, Assets",
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            {
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            {
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            {
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          ]
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      },
      "BusinessCombinationAcquisitionRelatedCosts": {
        "label": "Business Combination, Acquisition Related Costs",
        "description": "This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.",
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        "label": "Capitalized Costs, Uncompleted Wells, Equipment and Facilities",
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            {
              "end": "2024-12-31",
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      },
      "DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities": {
        "label": "Deferred Tax Liabilities, Unrealized Gains on Trading Securities",
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      "DefinedBenefitPlanAccumulatedBenefitObligation": {
        "label": "Defined Benefit Plan, Accumulated Benefit Obligation",
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              "accn": "0001104659-14-011816",
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            {
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            {
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            {
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        "units": {
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              "val": 5400000,
              "accn": "0000033213-19-000006",
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              "filed": "2019-02-14",
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            {
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              "end": "2016-06-30",
              "val": 5400000,
              "accn": "0000033213-18-000003",
              "fy": 2017,
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              "filed": "2018-02-15"
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          ]
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      "DefinedBenefitPlanBenefitsPaid": {
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              "filed": "2017-02-09",
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        "units": {
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              "filed": "2013-02-21",
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              "frame": "CY2011"
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            {
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            {
              "start": "2012-01-01",
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              "accn": "0001104659-14-011816",
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            {
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              "form": "10-K",
              "filed": "2016-02-11",
              "frame": "CY2013"
            },
            {
              "start": "2013-01-01",
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              "val": 223000,
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              "form": "10-K",
              "filed": "2015-02-12"
            },
            {
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              "val": 229000,
              "accn": "0000033213-17-000003",
              "fy": 2016,
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              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2014"
            },
            {
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              "val": 229000,
              "accn": "0000033213-16-000018",
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              "filed": "2016-02-11"
            },
            {
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              "end": "2014-12-31",
              "val": 229000,
              "accn": "0000033213-15-000004",
              "fy": 2014,
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              "form": "10-K",
              "filed": "2015-02-12"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 278000,
              "accn": "0000033213-17-000003",
              "fy": 2016,
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              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2015"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 278000,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "start": "2016-01-01",
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              "val": 190000,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2016"
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          ]
        }
      },
      "DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1": {
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        "description": "Amount of decrease in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point decrease in assumed health care cost trend rate.",
        "units": {
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              "end": "2010-12-31",
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              "form": "10-K",
              "filed": "2013-02-21",
              "frame": "CY2010"
            },
            {
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              "accn": "0001104659-14-011816",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-20",
              "frame": "CY2011"
            },
            {
              "start": "2011-01-01",
              "end": "2011-12-31",
              "val": -39000,
              "accn": "0001104659-13-012699",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-21"
            },
            {
              "start": "2012-01-01",
              "end": "2012-12-31",
              "val": -32000,
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              "form": "10-K",
              "filed": "2014-02-20"
            },
            {
              "start": "2012-01-01",
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              "form": "10-K",
              "filed": "2013-02-21"
            },
            {
              "start": "2012-01-01",
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              "val": 32000,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12",
              "frame": "CY2012"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": -26000,
              "accn": "0001104659-14-011816",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-20"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 26000,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11",
              "frame": "CY2013"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 26000,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 14000,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2014"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 14000,
              "accn": "0000033213-16-000018",
              "fy": 2015,
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              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "start": "2014-01-01",
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              "val": 14000,
              "accn": "0000033213-15-000004",
              "fy": 2014,
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              "form": "10-K",
              "filed": "2015-02-12"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 11000,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2015"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 11000,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 18000,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2016"
            }
          ]
        }
      },
      "DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation": {
        "label": "Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation",
        "description": "Amount of increase in accumulated postretirement benefit obligation from one-percentage-point increase in assumed health care cost trend rate.",
        "units": {
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              "start": "2010-01-01",
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              "accn": "0001104659-13-012699",
              "fy": 2012,
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              "filed": "2013-02-21",
              "frame": "CY2010"
            },
            {
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              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-20",
              "frame": "CY2011"
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            {
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            {
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              "form": "10-K",
              "filed": "2014-02-20"
            },
            {
              "start": "2012-01-01",
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              "val": 711000,
              "accn": "0001104659-13-012699",
              "fy": 2012,
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              "form": "10-K",
              "filed": "2013-02-21"
            },
            {
              "start": "2012-01-01",
              "end": "2012-12-31",
              "val": 711000,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12",
              "frame": "CY2012"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 220000,
              "accn": "0001104659-14-011816",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-20"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 220000,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11",
              "frame": "CY2013"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 220000,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 228000,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2014"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 228000,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 228000,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 268000,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2015"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 268000,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 181000,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2016"
            }
          ]
        }
      },
      "DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents": {
        "label": "Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components",
        "description": "Amount of increase in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point increase in assumed health care cost trend rate.",
        "units": {
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              "end": "2010-12-31",
              "val": 47000,
              "accn": "0001104659-13-012699",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-21",
              "frame": "CY2010"
            },
            {
              "start": "2011-01-01",
              "end": "2011-12-31",
              "val": 40000,
              "accn": "0001104659-14-011816",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-20",
              "frame": "CY2011"
            },
            {
              "start": "2011-01-01",
              "end": "2011-12-31",
              "val": 40000,
              "accn": "0001104659-13-012699",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-21"
            },
            {
              "start": "2012-01-01",
              "end": "2012-12-31",
              "val": 32000,
              "accn": "0001104659-14-011816",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-20"
            },
            {
              "start": "2012-01-01",
              "end": "2012-12-31",
              "val": 32000,
              "accn": "0001104659-13-012699",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-21"
            },
            {
              "start": "2012-01-01",
              "end": "2012-12-31",
              "val": 32000,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12",
              "frame": "CY2012"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 25000,
              "accn": "0001104659-14-011816",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-20"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 25000,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11",
              "frame": "CY2013"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 25000,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 13000,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2014"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 13000,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 13000,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 10000,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2015"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 10000,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 16000,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2016"
            }
          ]
        }
      },
      "DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear": {
        "label": "Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year",
        "description": "Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position.",
        "units": {
          "USD": [
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              "val": -9400000,
              "accn": "0000033213-19-000006",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-14",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2016-12-31",
              "val": -9400000,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15"
            }
          ]
        }
      },
      "DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths": {
        "label": "Defined Benefit Plan, Expected Future Benefit Payment, Year One",
        "description": "Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.",
        "units": {
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              "end": "2016-03-31",
              "val": 6000000,
              "accn": "0000033213-16-000022",
              "fy": 2016,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2016-04-28",
              "frame": "CY2016Q1I"
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          ]
        }
      },
      "DefinedBenefitPlanRecognizedNetGainLossDueToSettlements": {
        "label": "Defined Benefit Plan, Recognized Net (Gain) Loss Due to Settlements (Deprecated 2012-01-31)",
        "description": "The amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts to cover vested benefits.",
        "units": {
          "USD": [
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              "start": "2008-01-01",
              "end": "2008-12-31",
              "val": 9000000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24",
              "frame": "CY2008"
            }
          ]
        }
      },
      "DefinedBenefitPlanUltimateHealthCareCostTrendRate": {
        "label": "Defined Benefit Plan, Ultimate Health Care Cost Trend Rate (Deprecated 2017-01-31)",
        "description": "The ultimate trend rate for health care costs.",
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              "start": "2010-01-01",
              "end": "2010-12-31",
              "val": 0.05,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24",
              "frame": "CY2010"
            },
            {
              "start": "2011-01-01",
              "end": "2011-12-31",
              "val": 0.05,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2011"
            },
            {
              "start": "2012-01-01",
              "end": "2012-12-31",
              "val": 0.05,
              "accn": "0001104659-13-012699",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-21",
              "frame": "CY2012"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 0.05,
              "accn": "0001104659-14-011816",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-20",
              "frame": "CY2013"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 0.05,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12",
              "frame": "CY2014"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 0.05,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11",
              "frame": "CY2015"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 0.05,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2016"
            }
          ]
        }
      },
      "DefinedBenefitPlanWeightedAverageAssetAllocations": {
        "label": "Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage",
        "description": "Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.",
        "units": {
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              "val": 1,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24",
              "frame": "CY2009Q4I"
            },
            {
              "end": "2010-12-31",
              "val": 1,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2010-12-31",
              "val": 1,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24"
            },
            {
              "end": "2011-12-31",
              "val": 1,
              "accn": "0001104659-13-012699",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-21",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2011-12-31",
              "val": 1,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16"
            },
            {
              "end": "2012-12-31",
              "val": 1,
              "accn": "0001104659-14-011816",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-20",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2012-12-31",
              "val": 1,
              "accn": "0001104659-13-012699",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-21"
            },
            {
              "end": "2013-12-31",
              "val": 1,
              "accn": "0001104659-14-011816",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-20"
            },
            {
              "end": "2013-12-31",
              "val": 1,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2014-12-31",
              "val": 1,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2014-12-31",
              "val": 1,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12"
            },
            {
              "end": "2015-12-31",
              "val": 1,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11",
              "frame": "CY2015Q4I"
            }
          ]
        }
      },
      "DefinedContributionPlanCostRecognized": {
        "label": "Defined Contribution Plan, Cost",
        "description": "Amount of cost for defined contribution plan.",
        "units": {
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              "end": "2008-12-31",
              "val": 8800000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24",
              "frame": "CY2008"
            },
            {
              "start": "2009-01-01",
              "end": "2009-12-31",
              "val": 10100000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24"
            },
            {
              "start": "2009-01-01",
              "end": "2009-12-31",
              "val": 10100000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2009"
            },
            {
              "start": "2010-01-01",
              "end": "2010-12-31",
              "val": 10400000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24"
            },
            {
              "start": "2010-01-01",
              "end": "2010-12-31",
              "val": 10400000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16"
            },
            {
              "start": "2010-01-01",
              "end": "2010-12-31",
              "val": 10400000,
              "accn": "0001104659-13-012699",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-21",
              "frame": "CY2010"
            },
            {
              "start": "2011-01-01",
              "end": "2011-12-31",
              "val": 10100000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16"
            },
            {
              "start": "2011-01-01",
              "end": "2011-12-31",
              "val": 10100000,
              "accn": "0001104659-13-012699",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-21"
            },
            {
              "start": "2011-01-01",
              "end": "2011-12-31",
              "val": 10100000,
              "accn": "0001104659-14-011816",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-20",
              "frame": "CY2011"
            },
            {
              "start": "2012-01-01",
              "end": "2012-12-31",
              "val": 12000000,
              "accn": "0001104659-13-012699",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-21"
            },
            {
              "start": "2012-01-01",
              "end": "2012-12-31",
              "val": 12000000,
              "accn": "0001104659-14-011816",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-20"
            },
            {
              "start": "2012-01-01",
              "end": "2012-12-31",
              "val": 12000000,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12",
              "frame": "CY2012"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 14600000,
              "accn": "0001104659-14-011816",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-20"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 14600000,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 14600000,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11",
              "frame": "CY2013"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 13700000,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 13700000,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 13700000,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2014"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 15700000,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 15700000,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 15700000,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2015"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 16000000,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 16000000,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 16000000,
              "accn": "0000033213-19-000006",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-14",
              "frame": "CY2016"
            },
            {
              "start": "2017-01-01",
              "end": "2017-12-31",
              "val": 16600000,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15"
            },
            {
              "start": "2017-01-01",
              "end": "2017-12-31",
              "val": 16600000,
              "accn": "0000033213-19-000006",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-14"
            },
            {
              "start": "2017-01-01",
              "end": "2017-12-31",
              "val": 16600000,
              "accn": "0000033213-20-000008",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-27",
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              "accn": "0001104659-11-058465",
              "fy": 2011,
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              "form": "10-Q",
              "filed": "2011-10-27",
              "frame": "CY2011Q3I"
            },
            {
              "end": "2011-12-31",
              "val": 123960000,
              "accn": "0001104659-13-012699",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-21",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2011-12-31",
              "val": 123960000,
              "accn": "0001104659-12-071186",
              "fy": 2012,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2012-10-25"
            },
            {
              "end": "2011-12-31",
              "val": 123960000,
              "accn": "0001104659-12-051449",
              "fy": 2012,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2012-07-26"
            },
            {
              "end": "2011-12-31",
              "val": 123960000,
              "accn": "0001104659-12-029053",
              "fy": 2012,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2012-04-26"
            },
            {
              "end": "2011-12-31",
              "val": 123960000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16"
            },
            {
              "end": "2012-03-31",
              "val": 65657000,
              "accn": "0001104659-12-029053",
              "fy": 2012,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2012-04-26",
              "frame": "CY2012Q1I"
            },
            {
              "end": "2012-06-30",
              "val": 77907000,
              "accn": "0001104659-12-051449",
              "fy": 2012,
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              "form": "10-Q",
              "filed": "2012-07-26",
              "frame": "CY2012Q2I"
            },
            {
              "end": "2012-09-30",
              "val": 88171000,
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              "fy": 2012,
              "fp": "Q3",
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              "filed": "2012-10-25",
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            },
            {
              "end": "2012-12-31",
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              "accn": "0001104659-14-011816",
              "fy": 2013,
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              "frame": "CY2012Q4I"
            },
            {
              "end": "2012-12-31",
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            },
            {
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            },
            {
              "end": "2012-12-31",
              "val": 76787000,
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            },
            {
              "end": "2012-12-31",
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              "filed": "2013-02-21"
            },
            {
              "end": "2013-03-31",
              "val": 41405000,
              "accn": "0001104659-13-032980",
              "fy": 2013,
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              "form": "10-Q",
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              "frame": "CY2013Q1I"
            },
            {
              "end": "2013-06-30",
              "val": 55034000,
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              "form": "10-Q",
              "filed": "2013-07-25",
              "frame": "CY2013Q2I"
            },
            {
              "end": "2013-09-30",
              "val": 67911000,
              "accn": "0001104659-13-077631",
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              "fp": "Q3",
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            },
            {
              "end": "2013-12-31",
              "val": 19656000,
              "accn": "0001104659-14-053274",
              "fy": 2014,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2014-07-24"
            },
            {
              "end": "2013-12-31",
              "val": 19656000,
              "accn": "0001104659-14-029892",
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              "form": "10-Q",
              "filed": "2014-04-24"
            },
            {
              "end": "2013-12-31",
              "val": 19656000,
              "accn": "0001104659-14-011816",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-20"
            },
            {
              "end": "2013-12-31",
              "val": 19656000,
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              "filed": "2015-02-12",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2014-03-31",
              "val": 9928000,
              "accn": "0001104659-14-029892",
              "fy": 2014,
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              "frame": "CY2014Q1I"
            },
            {
              "end": "2014-06-30",
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            },
            {
              "end": "2014-12-31",
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              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12",
              "frame": "CY2014Q4I"
            }
          ]
        }
      },
      "EquityMethodInvestmentAggregateCost": {
        "label": "Equity Method Investment, Aggregate Cost",
        "description": "This element represents the aggregate cost of investments accounted for under the equity method of accounting.",
        "units": {
          "USD": [
            {
              "end": "2019-12-31",
              "val": 676009000,
              "accn": "0000033213-20-000016",
              "fy": 2020,
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            },
            {
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            },
            {
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              "fy": 2020,
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              "form": "10-Q",
              "filed": "2020-10-22"
            },
            {
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              "accn": "0000033213-21-000006",
              "fy": 2020,
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              "filed": "2021-02-17",
              "frame": "CY2019Q4I"
            },
            {
              "end": "2020-03-31",
              "val": 127258000,
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              "fy": 2020,
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              "filed": "2020-05-07",
              "frame": "CY2020Q1I"
            },
            {
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              "filed": "2020-07-27",
              "frame": "CY2020Q2I"
            },
            {
              "end": "2020-09-30",
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              "filed": "2020-10-22",
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            },
            {
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              "accn": "0000033213-21-000006",
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              "filed": "2021-02-17",
              "frame": "CY2020Q4I"
            }
          ]
        }
      },
      "EquityMethodInvestmentOwnershipPercentage": {
        "label": "Equity Method Investment, Ownership Percentage",
        "description": "The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.",
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              "filed": "2012-02-16",
              "frame": "CY2010Q4I"
            },
            {
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              "form": "10-Q",
              "filed": "2015-10-22"
            },
            {
              "end": "2014-06-30",
              "val": 0.5,
              "accn": "0000033213-15-000011",
              "fy": 2015,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2015-07-23",
              "frame": "CY2014Q2I"
            }
          ]
        }
      },
      "EquityMethodInvestmentSummarizedFinancialInformationAssets": {
        "label": "Equity Method Investment, Summarized Financial Information, Assets (Deprecated 2020-01-31)",
        "description": "The amount of assets reported by an equity method investment of the entity.",
        "units": {
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              "accn": "0001104659-11-009751",
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              "filed": "2011-02-24",
              "frame": "CY2009Q4I"
            },
            {
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              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2010-12-31",
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              "filed": "2011-02-24"
            },
            {
              "end": "2011-12-31",
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              "filed": "2013-02-21",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2011-12-31",
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            },
            {
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              "filed": "2014-02-20",
              "frame": "CY2012Q4I"
            },
            {
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            },
            {
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            },
            {
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              "filed": "2015-02-12",
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            },
            {
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              "fy": 2014,
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              "form": "10-K",
              "filed": "2015-02-12",
              "frame": "CY2014Q4I"
            }
          ]
        }
      },
      "EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets": {
        "label": "Equity Method Investment, Summarized Financial Information, Current Assets (Deprecated 2020-01-31)",
        "description": "The amount of current assets reported by an equity method investment of the entity.",
        "units": {
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              "accn": "0001104659-11-009751",
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              "filed": "2011-02-24",
              "frame": "CY2009Q4I"
            },
            {
              "end": "2010-12-31",
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              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2010-12-31",
              "val": 45493000,
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              "fy": 2010,
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              "form": "10-K",
              "filed": "2011-02-24"
            },
            {
              "end": "2011-12-31",
              "val": 18838000,
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              "fy": 2012,
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              "form": "10-K",
              "filed": "2013-02-21",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2011-12-31",
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              "fy": 2011,
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              "filed": "2012-02-16"
            },
            {
              "end": "2012-12-31",
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              "form": "10-K",
              "filed": "2014-02-20",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2012-12-31",
              "val": 15966000,
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              "fy": 2012,
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              "filed": "2013-02-21"
            },
            {
              "end": "2013-12-31",
              "val": 27014000,
              "accn": "0001104659-14-011816",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-20"
            },
            {
              "end": "2013-12-31",
              "val": 27014000,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2014-12-31",
              "val": 0,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12",
              "frame": "CY2014Q4I"
            }
          ]
        }
      },
      "EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities": {
        "label": "Equity Method Investment, Summarized Financial Information, Current Liabilities (Deprecated 2020-01-31)",
        "description": "The amount of current liabilities reported by an equity method investment of the entity.",
        "units": {
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            {
              "end": "2009-12-31",
              "val": 6350000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24",
              "frame": "CY2009Q4I"
            },
            {
              "end": "2010-12-31",
              "val": 8013000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2010-12-31",
              "val": 8013000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24"
            },
            {
              "end": "2011-12-31",
              "val": 5210000,
              "accn": "0001104659-13-012699",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-21",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2011-12-31",
              "val": 5210000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16"
            },
            {
              "end": "2012-12-31",
              "val": 4476000,
              "accn": "0001104659-14-011816",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-20",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2012-12-31",
              "val": 4476000,
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              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-21"
            },
            {
              "end": "2013-12-31",
              "val": 8529000,
              "accn": "0001104659-14-011816",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-20"
            },
            {
              "end": "2013-12-31",
              "val": 8529000,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2014-12-31",
              "val": 0,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12",
              "frame": "CY2014Q4I"
            }
          ]
        }
      },
      "EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital": {
        "label": "Equity Method Investment, Summarized Financial Information, Equity Excluding Noncontrolling Interests (Deprecated 2020-01-31)",
        "description": "Amount of equity, excluding noncontrolling interest, attributable to the equity method investment of the entity.",
        "units": {
          "USD": [
            {
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              "val": 431156000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24",
              "frame": "CY2009Q4I"
            },
            {
              "end": "2010-12-31",
              "val": 436927000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2010-12-31",
              "val": 436927000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
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              "form": "10-K",
              "filed": "2011-02-24"
            },
            {
              "end": "2011-12-31",
              "val": 273914000,
              "accn": "0001104659-13-012699",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-21",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2011-12-31",
              "val": 273914000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16"
            },
            {
              "end": "2012-12-31",
              "val": 260837000,
              "accn": "0001104659-14-011816",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-20",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2012-12-31",
              "val": 260837000,
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              "fy": 2012,
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              "filed": "2013-02-21"
            },
            {
              "end": "2013-12-31",
              "val": 258068000,
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              "fy": 2013,
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              "form": "10-K",
              "filed": "2014-02-20"
            },
            {
              "end": "2013-12-31",
              "val": 258068000,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2014-12-31",
              "val": 0,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12",
              "frame": "CY2014Q4I"
            }
          ]
        }
      },
      "EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity": {
        "label": "Equity Method Investment, Summarized Financial Information, Liabilities and Equity (Deprecated 2020-01-31)",
        "description": "The amount of liabilities and equity reported by an equity method investment of the entity.",
        "units": {
          "USD": [
            {
              "end": "2009-12-31",
              "val": 437506000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
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              "form": "10-K",
              "filed": "2011-02-24",
              "frame": "CY2009Q4I"
            },
            {
              "end": "2010-12-31",
              "val": 444940000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2010Q4I"
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            {
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            {
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            {
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            {
              "end": "2013-12-31",
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            {
              "end": "2014-12-31",
              "val": 0,
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            {
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            {
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            {
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            {
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            {
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              "filed": "2015-02-12"
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            {
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            {
              "start": "2014-01-01",
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              "filed": "2015-02-12"
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            {
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              "filed": "2016-02-11",
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          ]
        }
      },
      "EquityMethodInvestmentSummarizedFinancialInformationNetSalesOrGrossRevenue": {
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        "description": "The amount of noncurrent assets reported by an equity method investment of the entity.",
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            {
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            {
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            {
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            {
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            {
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            {
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            {
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      },
      "EquityMethodInvestments": {
        "label": "Equity Method Investments",
        "description": "This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.",
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              "val": 0,
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      "ExplorationAbandonmentAndImpairmentExpense": {
        "label": "Exploration Abandonment and Impairment Expense",
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              "filed": "2018-02-15",
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        "label": "Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Income Tax Expense",
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            {
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              "val": 89000,
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            {
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              "fy": 2011,
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              "filed": "2011-07-28",
              "frame": "CY2010Q2"
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            {
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              "val": 369000,
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              "fy": 2010,
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        "label": "Gain (Loss) on Disposition of Oil and Gas Property",
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            {
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            },
            {
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              "filed": "2015-02-12"
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            {
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            {
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              "val": 0,
              "accn": "0000033213-15-000014",
              "fy": 2015,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2015-10-22",
              "frame": "CY2015Q3"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 0,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2015"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 0,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 0,
              "accn": "0000033213-16-000018",
              "fy": 2015,
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              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
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              "end": "2016-12-31",
              "val": 8025000,
              "accn": "0000033213-19-000006",
              "fy": 2018,
              "fp": "FY",
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              "filed": "2019-02-14",
              "frame": "CY2016"
            },
            {
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              "val": 8025000,
              "accn": "0000033213-18-000003",
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              "form": "10-K",
              "filed": "2018-02-15"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 8025000,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
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              "val": 0,
              "accn": "0000033213-19-000006",
              "fy": 2018,
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              "form": "10-K",
              "filed": "2019-02-14",
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            {
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              "accn": "0000033213-18-000003",
              "fy": 2017,
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              "filed": "2018-02-15"
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            {
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            },
            {
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              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2015"
            },
            {
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              "filed": "2017-02-09"
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            {
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              "val": 8025000,
              "accn": "0000033213-18-000003",
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            {
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              "filed": "2019-02-14",
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            {
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              "accn": "0000033213-18-000003",
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            {
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              "filed": "2022-04-28"
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            {
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              "end": "2021-12-31",
              "val": 23909000,
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              "fy": 2022,
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              "form": "10-K",
              "filed": "2023-02-16",
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            {
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          ]
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            {
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            {
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              "filed": "2011-02-24"
            },
            {
              "start": "2009-01-01",
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            {
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            {
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            {
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            {
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            {
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            {
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            {
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            {
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            {
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            },
            {
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      "IncreaseDueToPurchasesOfMineralsInPlace": {
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              "form": "10-Q",
              "filed": "2025-10-22",
              "frame": "CY2025Q3I"
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              "form": "10-K",
              "filed": "2026-02-18"
            },
            {
              "end": "2025-12-31",
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              "form": "10-Q",
              "filed": "2026-04-22"
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            {
              "end": "2025-12-31",
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              "accn": "0000033213-26-000043",
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              "fp": "Q2",
              "form": "10-Q",
              "filed": "2026-07-22",
              "frame": "CY2025Q4I"
            },
            {
              "end": "2026-03-31",
              "val": 87601000,
              "accn": "0000033213-26-000030",
              "fy": 2026,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2026-04-22",
              "frame": "CY2026Q1I"
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            {
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              "fp": "Q2",
              "form": "10-Q",
              "filed": "2026-07-22",
              "frame": "CY2026Q2I"
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          ]
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            {
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              "filed": "2011-02-24",
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              "filed": "2013-02-21"
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              "filed": "2014-02-20"
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            {
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              "filed": "2016-02-11"
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              "filed": "2015-02-12"
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              "val": 11848000,
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            {
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              "accn": "0000033213-21-000020",
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              "form": "10-Q",
              "filed": "2021-07-29"
            },
            {
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              "val": 11829000,
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            {
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              "val": 66861000,
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              "filed": "2021-10-28"
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            {
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            },
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              "val": 56000000,
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              "val": 85200000,
              "accn": "0000033213-18-000003",
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              "accn": "0000033213-17-000003",
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            },
            {
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            },
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              "val": 44100000,
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            },
            {
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              "val": 60800000,
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              "filed": "2019-02-14",
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              "val": 60800000,
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              "filed": "2018-02-15"
            },
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              "accn": "0000033213-19-000006",
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              "filed": "2019-02-14",
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      },
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        "label": "Lease, Cost",
        "description": "Amount of lease cost recognized by lessee for lease contract.",
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            {
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              "fy": 2019,
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              "form": "10-Q",
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            {
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            },
            {
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              "fy": 2013,
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              "filed": "2013-07-25"
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              "fp": "Q2",
              "form": "10-Q",
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              "frame": "CY2013Q2"
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            {
              "start": "2013-04-01",
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            {
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            {
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            {
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            {
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              "form": "10-Q",
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            },
            {
              "start": "2013-01-01",
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              "filed": "2014-02-20"
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            {
              "start": "2013-01-01",
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              "val": 0.017,
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              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12",
              "frame": "CY2013"
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        }
      },
      "LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod": {
        "label": "Line of Credit Facility, Maximum Amount Outstanding During Period",
        "description": "Maximum amount borrowed under the credit facility at any time during the period.",
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              "val": 448900000,
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              "frame": "CY2009"
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            {
              "start": "2010-01-01",
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            {
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            {
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            {
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              "filed": "2013-10-24"
            },
            {
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              "val": 178500000,
              "accn": "0000033213-14-000004",
              "fy": 2014,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2014-10-23"
            },
            {
              "start": "2013-07-01",
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              "val": 140500000,
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            {
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              "val": 140500000,
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              "fy": 2014,
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              "frame": "CY2013Q3"
            },
            {
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              "val": 178500000,
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              "fy": 2013,
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              "filed": "2014-02-20"
            },
            {
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              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12",
              "frame": "CY2013"
            },
            {
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              "val": 0,
              "accn": "0001104659-14-029892",
              "fy": 2014,
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              "form": "10-Q",
              "filed": "2014-04-24",
              "frame": "CY2014Q1"
            },
            {
              "start": "2014-01-01",
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              "val": 0,
              "accn": "0001104659-14-053274",
              "fy": 2014,
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              "form": "10-Q",
              "filed": "2014-07-24"
            },
            {
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              "val": 0,
              "accn": "0001104659-14-053274",
              "fy": 2014,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2014-07-24",
              "frame": "CY2014Q2"
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          ]
        }
      },
      "LineOfCreditFacilityMaximumBorrowingCapacity": {
        "label": "Line of Credit Facility, Maximum Borrowing Capacity",
        "description": "Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.",
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              "val": 1500000000,
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              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2010Q4I"
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            {
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              "val": 1500000000,
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              "fy": 2010,
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              "filed": "2011-02-24"
            },
            {
              "end": "2012-12-31",
              "val": 1500000000,
              "accn": "0001104659-13-077631",
              "fy": 2013,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2013-10-24",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2012-12-31",
              "val": 1500000000,
              "accn": "0001104659-13-012699",
              "fy": 2012,
              "fp": "FY",
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            {
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              "val": 1500000000,
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              "fy": 2013,
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              "end": "2014-02-18",
              "val": 1500000000,
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        }
      },
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        "label": "Line of Credit, Current",
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              "filed": "2017-02-09",
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      },
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        "label": "Estimated Litigation Liability, Current",
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      },
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              "fp": null,
              "form": "8-K",
              "filed": "2022-04-28",
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            {
              "start": "2020-01-01",
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              "val": 11350000,
              "accn": "0000033213-21-000006",
              "fy": 2020,
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              "form": "10-K",
              "filed": "2021-02-17"
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      },
      "OperatingLeaseRightOfUseAsset": {
        "label": "Operating Lease, Right-of-Use Asset",
        "description": "Amount of lessee's right to use underlying asset under operating lease.",
        "units": {
          "USD": [
            {
              "end": "2019-01-01",
              "val": 89000000,
              "accn": "0000033213-19-000014",
              "fy": 2019,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-04-25"
            },
            {
              "end": "2019-01-01",
              "val": 89000000,
              "accn": "0000033213-19-000023",
              "fy": 2019,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-07-25"
            },
            {
              "end": "2019-01-01",
              "val": 89000000,
              "accn": "0000033213-19-000031",
              "fy": 2019,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-10-31"
            },
            {
              "end": "2019-01-01",
              "val": 89000000,
              "accn": "0000033213-20-000008",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-27"
            },
            {
              "end": "2019-01-01",
              "val": 89000000,
              "accn": "0000033213-21-000006",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2021-02-17",
              "frame": "CY2018Q4I"
            },
            {
              "end": "2019-03-31",
              "val": 67300000,
              "accn": "0000033213-19-000014",
              "fy": 2019,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-04-25",
              "frame": "CY2019Q1I"
            },
            {
              "end": "2019-06-30",
              "val": 51600000,
              "accn": "0000033213-19-000023",
              "fy": 2019,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-07-25",
              "frame": "CY2019Q2I"
            },
            {
              "end": "2019-09-30",
              "val": 59100000,
              "accn": "0000033213-19-000031",
              "fy": 2019,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-10-31",
              "frame": "CY2019Q3I"
            },
            {
              "end": "2019-12-31",
              "val": 52200000,
              "accn": "0000033213-20-000008",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-27"
            },
            {
              "end": "2019-12-31",
              "val": 52200000,
              "accn": "0000033213-21-000006",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2021-02-17",
              "frame": "CY2019Q4I"
            },
            {
              "end": "2020-12-31",
              "val": 21600000,
              "accn": "0000033213-21-000006",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2021-02-17"
            },
            {
              "end": "2020-12-31",
              "val": 21600000,
              "accn": "0000033213-22-000007",
              "fy": 2021,
              "fp": "FY",
              "form": "10-K",
              "filed": "2022-02-10"
            },
            {
              "end": "2020-12-31",
              "val": 21600000,
              "accn": "0000033213-22-000015",
              "fy": null,
              "fp": null,
              "form": "8-K",
              "filed": "2022-04-28",
              "frame": "CY2020Q4I"
            },
            {
              "end": "2021-12-31",
              "val": 26100000,
              "accn": "0000033213-22-000007",
              "fy": 2021,
              "fp": "FY",
              "form": "10-K",
              "filed": "2022-02-10"
            },
            {
              "end": "2021-12-31",
              "val": 26100000,
              "accn": "0000033213-22-000015",
              "fy": null,
              "fp": null,
              "form": "8-K",
              "filed": "2022-04-28"
            },
            {
              "end": "2021-12-31",
              "val": 26100000,
              "accn": "0000033213-23-000008",
              "fy": 2022,
              "fp": "FY",
              "form": "10-K",
              "filed": "2023-02-16",
              "frame": "CY2021Q4I"
            },
            {
              "end": "2022-12-31",
              "val": 29200000,
              "accn": "0000033213-23-000008",
              "fy": 2022,
              "fp": "FY",
              "form": "10-K",
              "filed": "2023-02-16"
            },
            {
              "end": "2022-12-31",
              "val": 29200000,
              "accn": "0000033213-24-000008",
              "fy": 2023,
              "fp": "FY",
              "form": "10-K",
              "filed": "2024-02-14",
              "frame": "CY2022Q4I"
            },
            {
              "end": "2023-12-31",
              "val": 48800000,
              "accn": "0000033213-24-000008",
              "fy": 2023,
              "fp": "FY",
              "form": "10-K",
              "filed": "2024-02-14"
            },
            {
              "end": "2023-12-31",
              "val": 42338000,
              "accn": "0000033213-25-000011",
              "fy": 2024,
              "fp": "FY",
              "form": "10-K",
              "filed": "2025-02-19",
              "frame": "CY2023Q4I"
            },
            {
              "end": "2024-12-31",
              "val": 60496000,
              "accn": "0000033213-25-000011",
              "fy": 2024,
              "fp": "FY",
              "form": "10-K",
              "filed": "2025-02-19"
            },
            {
              "end": "2024-12-31",
              "val": 60496000,
              "accn": "0000033213-26-000018",
              "fy": 2025,
              "fp": "FY",
              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2024Q4I"
            },
            {
              "end": "2025-12-31",
              "val": 74111000,
              "accn": "0000033213-26-000018",
              "fy": 2025,
              "fp": "FY",
              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2025Q4I"
            }
          ]
        }
      },
      "OperatingLeasesFutureMinimumPaymentsDue": {
        "label": "Operating Leases, Future Minimum Payments Due",
        "description": "Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.",
        "units": {
          "USD": [
            {
              "end": "2010-12-31",
              "val": 171700000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2011-12-31",
              "val": 200300000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2012-12-31",
              "val": 165400000,
              "accn": "0001104659-13-012699",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-21",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2013-12-31",
              "val": 134200000,
              "accn": "0001104659-14-011816",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-20",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2014-12-31",
              "val": 225600000,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2015-12-31",
              "val": 155500000,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2016-12-31",
              "val": 143300000,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2017-12-31",
              "val": 231500000,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2018-12-31",
              "val": 109900000,
              "accn": "0000033213-19-000006",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-14",
              "frame": "CY2018Q4I"
            }
          ]
        }
      },
      "OperatingLeasesFutureMinimumPaymentsDueCurrent": {
        "label": "Operating Leases, Future Minimum Payments Due, Next Twelve Months",
        "description": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "units": {
          "USD": [
            {
              "end": "2010-12-31",
              "val": 28400000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2011-12-31",
              "val": 39900000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2012-12-31",
              "val": 39700000,
              "accn": "0001104659-13-012699",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-21",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2013-12-31",
              "val": 42900000,
              "accn": "0001104659-14-011816",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-20",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2014-12-31",
              "val": 83400000,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2015-12-31",
              "val": 41500000,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2016-12-31",
              "val": 55500000,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2017-12-31",
              "val": 70900000,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2018-12-31",
              "val": 70300000,
              "accn": "0000033213-19-000006",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-14",
              "frame": "CY2018Q4I"
            }
          ]
        }
      },
      "OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals": {
        "label": "Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals",
        "description": "Contractually required future rental payments receivable on noncancelable subleasing arrangements.",
        "units": {
          "USD": [
            {
              "end": "2010-12-31",
              "val": 32400000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2011-12-31",
              "val": 30200000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2012-12-31",
              "val": 28300000,
              "accn": "0001104659-13-012699",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-21",
              "frame": "CY2012Q4I"
            }
          ]
        }
      },
      "OperatingLeasesFutureMinimumPaymentsDueInFiveYears": {
        "label": "Operating Leases, Future Minimum Payments, Due in Five Years",
        "description": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "units": {
          "USD": [
            {
              "end": "2010-12-31",
              "val": 8100000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2011-12-31",
              "val": 7900000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2012-12-31",
              "val": 8600000,
              "accn": "0001104659-13-012699",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-21",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2013-12-31",
              "val": 6300000,
              "accn": "0001104659-14-011816",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-20",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2014-12-31",
              "val": 9600000,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2015-12-31",
              "val": 9800000,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2016-12-31",
              "val": 9800000,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2017-12-31",
              "val": 13600000,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2018-12-31",
              "val": 8400000,
              "accn": "0000033213-19-000006",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-14",
              "frame": "CY2018Q4I"
            }
          ]
        }
      },
      "OperatingLeasesFutureMinimumPaymentsDueInFourYears": {
        "label": "Operating Leases, Future Minimum Payments, Due in Four Years",
        "description": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "units": {
          "USD": [
            {
              "end": "2010-12-31",
              "val": 15300000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2011-12-31",
              "val": 18300000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2012-12-31",
              "val": 14200000,
              "accn": "0001104659-13-012699",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-21",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2013-12-31",
              "val": 10700000,
              "accn": "0001104659-14-011816",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-20",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2014-12-31",
              "val": 16800000,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2015-12-31",
              "val": 11900000,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2016-12-31",
              "val": 9800000,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2017-12-31",
              "val": 13600000,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2018-12-31",
              "val": 8400000,
              "accn": "0000033213-19-000006",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-14",
              "frame": "CY2018Q4I"
            }
          ]
        }
      },
      "OperatingLeasesFutureMinimumPaymentsDueInThreeYears": {
        "label": "Operating Leases, Future Minimum Payments, Due in Three Years",
        "description": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "units": {
          "USD": [
            {
              "end": "2010-12-31",
              "val": 22200000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2011-12-31",
              "val": 28700000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2012-12-31",
              "val": 19100000,
              "accn": "0001104659-13-012699",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-21",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2013-12-31",
              "val": 18400000,
              "accn": "0001104659-14-011816",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-20",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2014-12-31",
              "val": 31700000,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2015-12-31",
              "val": 19700000,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2016-12-31",
              "val": 12200000,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2017-12-31",
              "val": 13400000,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2018-12-31",
              "val": 8400000,
              "accn": "0000033213-19-000006",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-14",
              "frame": "CY2018Q4I"
            }
          ]
        }
      },
      "OperatingLeasesFutureMinimumPaymentsDueInTwoYears": {
        "label": "Operating Leases, Future Minimum Payments, Due in Two Years",
        "description": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "units": {
          "USD": [
            {
              "end": "2010-12-31",
              "val": 23000000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2011-12-31",
              "val": 38700000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
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              "filed": "2011-02-24",
              "frame": "CY2009"
            },
            {
              "start": "2009-01-01",
              "end": "2009-12-31",
              "val": 5691000,
              "accn": "0001104659-10-007860",
              "fy": 2009,
              "fp": "FY",
              "form": "10-K",
              "filed": "2010-02-18"
            },
            {
              "start": "2010-01-01",
              "end": "2010-03-31",
              "val": 403000,
              "accn": "0001104659-11-023731",
              "fy": 2011,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2011-04-28",
              "frame": "CY2010Q1"
            },
            {
              "start": "2010-01-01",
              "end": "2010-06-30",
              "val": 806000,
              "accn": "0001104659-11-041495",
              "fy": 2011,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2011-07-28"
            },
            {
              "start": "2010-04-01",
              "end": "2010-06-30",
              "val": 403000,
              "accn": "0001104659-11-041495",
              "fy": 2011,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2011-07-28",
              "frame": "CY2010Q2"
            },
            {
              "start": "2010-01-01",
              "end": "2010-09-30",
              "val": 1211000,
              "accn": "0001104659-11-058465",
              "fy": 2011,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2011-10-27"
            },
            {
              "start": "2010-07-01",
              "end": "2010-09-30",
              "val": 405000,
              "accn": "0001104659-11-058465",
              "fy": 2011,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2011-10-27",
              "frame": "CY2010Q3"
            },
            {
              "start": "2010-01-01",
              "end": "2010-12-31",
              "val": -2021000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24",
              "frame": "CY2010"
            },
            {
              "start": "2011-01-01",
              "end": "2011-03-31",
              "val": 412000,
              "accn": "0001104659-11-023731",
              "fy": 2011,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2011-04-28",
              "frame": "CY2011Q1"
            },
            {
              "start": "2011-01-01",
              "end": "2011-06-30",
              "val": 824000,
              "accn": "0001104659-11-041495",
              "fy": 2011,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2011-07-28"
            },
            {
              "start": "2011-04-01",
              "end": "2011-06-30",
              "val": 413000,
              "accn": "0001104659-11-041495",
              "fy": 2011,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2011-07-28",
              "frame": "CY2011Q2"
            },
            {
              "start": "2011-01-01",
              "end": "2011-09-30",
              "val": 1236000,
              "accn": "0001104659-11-058465",
              "fy": 2011,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2011-10-27"
            },
            {
              "start": "2011-07-01",
              "end": "2011-09-30",
              "val": 412000,
              "accn": "0001104659-11-058465",
              "fy": 2011,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2011-10-27",
              "frame": "CY2011Q3"
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          ]
        }
      },
      "OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent": {
        "label": "Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent",
        "description": "Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan, attributable to parent.",
        "units": {
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              "start": "2009-01-01",
              "end": "2009-12-31",
              "val": -5691000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2009"
            },
            {
              "start": "2010-01-01",
              "end": "2010-12-31",
              "val": -2021000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2010"
            },
            {
              "start": "2011-01-01",
              "end": "2011-03-31",
              "val": -412000,
              "accn": "0001104659-12-029053",
              "fy": 2012,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2012-04-26",
              "frame": "CY2011Q1"
            },
            {
              "start": "2011-01-01",
              "end": "2011-06-30",
              "val": -824000,
              "accn": "0001104659-12-051449",
              "fy": 2012,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2012-07-26"
            },
            {
              "start": "2011-04-01",
              "end": "2011-06-30",
              "val": -413000,
              "accn": "0001104659-12-051449",
              "fy": 2012,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2012-07-26",
              "frame": "CY2011Q2"
            },
            {
              "start": "2011-01-01",
              "end": "2011-12-31",
              "val": 4474000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2011"
            },
            {
              "start": "2012-01-01",
              "end": "2012-03-31",
              "val": -947000,
              "accn": "0001104659-12-029053",
              "fy": 2012,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2012-04-26",
              "frame": "CY2012Q1"
            },
            {
              "start": "2012-01-01",
              "end": "2012-06-30",
              "val": -1436000,
              "accn": "0001104659-12-051449",
              "fy": 2012,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2012-07-26"
            },
            {
              "start": "2012-04-01",
              "end": "2012-06-30",
              "val": -489000,
              "accn": "0001104659-12-051449",
              "fy": 2012,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2012-07-26",
              "frame": "CY2012Q2"
            }
          ]
        }
      },
      "OtherComprehensiveIncomeDefinedBenefitPlansTax": {
        "label": "Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax (Deprecated 2012-01-31)",
        "description": "Tax effects of the increase (decrease) to accumulated comprehensive income during the period related to benefit plans. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.",
        "units": {
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              "end": "2007-12-31",
              "val": -3700000,
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              "form": "10-K",
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              "frame": "CY2007"
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            {
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              "val": 8697000,
              "accn": "0001104659-11-009751",
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              "form": "10-K",
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            {
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              "filed": "2010-02-18"
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            {
              "start": "2009-01-01",
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              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2009"
            },
            {
              "start": "2009-01-01",
              "end": "2009-12-31",
              "val": 3733000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24"
            },
            {
              "start": "2009-01-01",
              "end": "2009-12-31",
              "val": 3733000,
              "accn": "0001104659-10-007860",
              "fy": 2009,
              "fp": "FY",
              "form": "10-K",
              "filed": "2010-02-18"
            },
            {
              "start": "2010-01-01",
              "end": "2010-12-31",
              "val": 1331000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2010"
            },
            {
              "start": "2010-01-01",
              "end": "2010-12-31",
              "val": 1331000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
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              "filed": "2011-02-24"
            },
            {
              "start": "2011-01-01",
              "end": "2011-03-31",
              "val": 282000,
              "accn": "0001104659-12-029053",
              "fy": 2012,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2012-04-26",
              "frame": "CY2011Q1"
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            {
              "start": "2011-01-01",
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              "accn": "0001104659-12-051449",
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              "filed": "2012-07-26"
            },
            {
              "start": "2011-04-01",
              "end": "2011-06-30",
              "val": -281000,
              "accn": "0001104659-12-051449",
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              "frame": "CY2011Q2"
            },
            {
              "start": "2011-01-01",
              "end": "2011-12-31",
              "val": 2752000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
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              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2011"
            },
            {
              "start": "2012-01-01",
              "end": "2012-03-31",
              "val": 122000,
              "accn": "0001104659-12-029053",
              "fy": 2012,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2012-04-26",
              "frame": "CY2012Q1"
            },
            {
              "start": "2012-01-01",
              "end": "2012-06-30",
              "val": -214000,
              "accn": "0001104659-12-051449",
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              "form": "10-Q",
              "filed": "2012-07-26"
            },
            {
              "start": "2012-04-01",
              "end": "2012-06-30",
              "val": -92000,
              "accn": "0001104659-12-051449",
              "fy": 2012,
              "fp": "Q2",
              "form": "10-Q",
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              "frame": "CY2012Q2"
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          ]
        }
      },
      "OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease": {
        "label": "Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax (Deprecated 2012-01-31)",
        "description": "Net of tax effect change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges after taxes. A cash flow hedge is a hedge of the exposure to variability in the cash flows of a recognized asset or liability or a forecasted transaction that is attributable to a particular risk. The change includes an entity's share of an equity investee's increase or decrease in deferred hedging gains or losses. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.",
        "units": {
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              "end": "2007-12-31",
              "val": -20000,
              "accn": "0001104659-10-007860",
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              "fp": "FY",
              "form": "10-K",
              "filed": "2010-02-18",
              "frame": "CY2007"
            },
            {
              "start": "2008-01-01",
              "end": "2008-12-31",
              "val": 257442000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24",
              "frame": "CY2008"
            },
            {
              "start": "2008-01-01",
              "end": "2008-12-31",
              "val": 257442000,
              "accn": "0001104659-10-007860",
              "fy": 2009,
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              "form": "10-K",
              "filed": "2010-02-18"
            },
            {
              "start": "2009-01-01",
              "end": "2009-12-31",
              "val": 44401000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24",
              "frame": "CY2009"
            },
            {
              "start": "2009-01-01",
              "end": "2009-12-31",
              "val": 44401000,
              "accn": "0001104659-10-007860",
              "fy": 2009,
              "fp": "FY",
              "form": "10-K",
              "filed": "2010-02-18"
            },
            {
              "start": "2010-01-01",
              "end": "2010-03-31",
              "val": 63443000,
              "accn": "0001104659-11-023731",
              "fy": 2011,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2011-04-28",
              "frame": "CY2010Q1"
            },
            {
              "start": "2010-01-01",
              "end": "2010-06-30",
              "val": 33069000,
              "accn": "0001104659-11-041495",
              "fy": 2011,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2011-07-28"
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            {
              "start": "2010-04-01",
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              "val": -30374000,
              "accn": "0001104659-11-041495",
              "fy": 2011,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2011-07-28",
              "frame": "CY2010Q2"
            },
            {
              "start": "2010-01-01",
              "end": "2010-09-30",
              "val": 74885000,
              "accn": "0001104659-11-058465",
              "fy": 2011,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2011-10-27"
            },
            {
              "start": "2010-07-01",
              "end": "2010-09-30",
              "val": 41816000,
              "accn": "0001104659-11-058465",
              "fy": 2011,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2011-10-27",
              "frame": "CY2010Q3"
            },
            {
              "start": "2010-01-01",
              "end": "2010-12-31",
              "val": 49601000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24",
              "frame": "CY2010"
            },
            {
              "start": "2011-01-01",
              "end": "2011-03-31",
              "val": -12676000,
              "accn": "0001104659-11-023731",
              "fy": 2011,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2011-04-28",
              "frame": "CY2011Q1"
            },
            {
              "start": "2011-01-01",
              "end": "2011-06-30",
              "val": 10688000,
              "accn": "0001104659-11-041495",
              "fy": 2011,
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              "filed": "2011-07-28"
            },
            {
              "start": "2011-04-01",
              "end": "2011-06-30",
              "val": 23363000,
              "accn": "0001104659-11-041495",
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            },
            {
              "start": "2011-01-01",
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              "val": 59992000,
              "accn": "0001104659-11-058465",
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              "filed": "2011-10-27"
            },
            {
              "start": "2011-07-01",
              "end": "2011-09-30",
              "val": 49304000,
              "accn": "0001104659-11-058465",
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              "form": "10-Q",
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          ]
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      },
      "OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent": {
        "label": "Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent",
        "description": "Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss), attributable to parent entity.",
        "units": {
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              "end": "2009-12-31",
              "val": 44401000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2009"
            },
            {
              "start": "2010-01-01",
              "end": "2010-12-31",
              "val": 49601000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2010"
            },
            {
              "start": "2011-01-01",
              "end": "2011-03-31",
              "val": -12706000,
              "accn": "0001104659-12-029053",
              "fy": 2012,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2012-04-26",
              "frame": "CY2011Q1"
            },
            {
              "start": "2011-01-01",
              "end": "2011-06-30",
              "val": 10630000,
              "accn": "0001104659-12-051449",
              "fy": 2012,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2012-07-26"
            },
            {
              "start": "2011-04-01",
              "end": "2011-06-30",
              "val": 23334000,
              "accn": "0001104659-12-051449",
              "fy": 2012,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2012-07-26",
              "frame": "CY2011Q2"
            },
            {
              "start": "2011-01-01",
              "end": "2011-12-31",
              "val": 166840000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2011"
            },
            {
              "start": "2012-01-01",
              "end": "2012-03-31",
              "val": 59502000,
              "accn": "0001104659-12-029053",
              "fy": 2012,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2012-04-26",
              "frame": "CY2012Q1"
            },
            {
              "start": "2012-01-01",
              "end": "2012-06-30",
              "val": -4714000,
              "accn": "0001104659-12-051449",
              "fy": 2012,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2012-07-26"
            },
            {
              "start": "2012-04-01",
              "end": "2012-06-30",
              "val": -64216000,
              "accn": "0001104659-12-051449",
              "fy": 2012,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2012-07-26",
              "frame": "CY2012Q2"
            }
          ]
        }
      },
      "OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxEffectPeriodIncreaseDecrease": {
        "label": "Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Effect (Deprecated 2012-01-31)",
        "description": "Total tax effect of the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. The change includes an entity's share of an equity investee's increase or decrease in deferred hedging gains or losses. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.",
        "units": {
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              "end": "2007-12-31",
              "val": 370000,
              "accn": "0001104659-10-007860",
              "fy": 2009,
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              "form": "10-K",
              "filed": "2010-02-18",
              "frame": "CY2007"
            },
            {
              "start": "2008-01-01",
              "end": "2008-12-31",
              "val": 155678000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24",
              "frame": "CY2008"
            },
            {
              "start": "2008-01-01",
              "end": "2008-12-31",
              "val": 155678000,
              "accn": "0001104659-10-007860",
              "fy": 2009,
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            },
            {
              "start": "2009-01-01",
              "end": "2009-12-31",
              "val": 27166000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2009"
            },
            {
              "start": "2009-01-01",
              "end": "2009-12-31",
              "val": 27166000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24"
            },
            {
              "start": "2009-01-01",
              "end": "2009-12-31",
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      "PaymentsToAcquireAvailableForSaleSecurities": {
        "label": "Payments to Acquire Available-for-sale Securities",
        "description": "The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.",
        "units": {
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              "end": "2007-12-31",
              "val": 9709000,
              "accn": "0001104659-10-007860",
              "fy": 2009,
              "fp": "FY",
              "form": "10-K",
              "filed": "2010-02-18",
              "frame": "CY2007"
            },
            {
              "start": "2008-01-01",
              "end": "2008-06-30",
              "val": 3000000,
              "accn": "0001104659-09-045570",
              "fy": 2009,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2009-07-29"
            },
            {
              "start": "2008-01-01",
              "end": "2008-09-30",
              "val": 3000000,
              "accn": "0001104659-09-061197",
              "fy": 2009,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2009-10-29"
            },
            {
              "start": "2008-01-01",
              "end": "2008-12-31",
              "val": 3000000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24",
              "frame": "CY2008"
            },
            {
              "start": "2008-01-01",
              "end": "2008-12-31",
              "val": 3000000,
              "accn": "0001104659-10-007860",
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              "form": "10-K",
              "filed": "2010-02-18"
            },
            {
              "start": "2009-01-01",
              "end": "2009-03-31",
              "val": 3000000,
              "accn": "0001104659-10-022535",
              "fy": 2010,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2010-04-28",
              "frame": "CY2009Q1"
            },
            {
              "start": "2009-01-01",
              "end": "2009-06-30",
              "val": 3000000,
              "accn": "0001104659-10-040530",
              "fy": 2010,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2010-07-29"
            },
            {
              "start": "2009-01-01",
              "end": "2009-06-30",
              "val": 3000000,
              "accn": "0001104659-09-045570",
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              "form": "10-Q",
              "filed": "2009-07-29"
            },
            {
              "start": "2009-01-01",
              "end": "2009-09-30",
              "val": 3000000,
              "accn": "0001104659-10-054336",
              "fy": 2010,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2010-10-28"
            },
            {
              "start": "2009-01-01",
              "end": "2009-09-30",
              "val": 3000000,
              "accn": "0001104659-09-061197",
              "fy": 2009,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2009-10-29"
            },
            {
              "start": "2009-01-01",
              "end": "2009-12-31",
              "val": 3000000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2009"
            },
            {
              "start": "2009-01-01",
              "end": "2009-12-31",
              "val": 3000000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24"
            },
            {
              "start": "2009-01-01",
              "end": "2009-12-31",
              "val": 3000000,
              "accn": "0001104659-10-007860",
              "fy": 2009,
              "fp": "FY",
              "form": "10-K",
              "filed": "2010-02-18"
            },
            {
              "start": "2010-01-01",
              "end": "2010-03-31",
              "val": 750000,
              "accn": "0001104659-11-023731",
              "fy": 2011,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2011-04-28",
              "frame": "CY2010Q1"
            },
            {
              "start": "2010-01-01",
              "end": "2010-03-31",
              "val": 750000,
              "accn": "0001104659-10-022535",
              "fy": 2010,
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            },
            {
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              "filed": "2011-07-28"
            },
            {
              "start": "2010-01-01",
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              "fy": 2010,
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              "filed": "2010-07-29"
            },
            {
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              "end": "2010-09-30",
              "val": 750000,
              "accn": "0001104659-11-058465",
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              "filed": "2011-10-27"
            },
            {
              "start": "2010-01-01",
              "end": "2010-09-30",
              "val": 750000,
              "accn": "0001104659-10-054336",
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              "fp": "Q3",
              "form": "10-Q",
              "filed": "2010-10-28"
            },
            {
              "start": "2010-01-01",
              "end": "2010-12-31",
              "val": 750000,
              "accn": "0001104659-13-012699",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-21",
              "frame": "CY2010"
            },
            {
              "start": "2010-01-01",
              "end": "2010-12-31",
              "val": 750000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16"
            },
            {
              "start": "2010-01-01",
              "end": "2010-12-31",
              "val": 750000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
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              "form": "10-K",
              "filed": "2011-02-24"
            }
          ]
        }
      },
      "PaymentsToAcquireBusinessesAndInterestInAffiliates": {
        "label": "Payments to Acquire Businesses and Interest in Affiliates",
        "description": "The cash outflow associated with the acquisition of a controlling interest in another entity or an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment).",
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              "form": "10-Q",
              "filed": "2009-07-29"
            },
            {
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              "end": "2008-09-30",
              "val": 22800000,
              "accn": "0001104659-09-061197",
              "fy": 2009,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2009-10-29"
            },
            {
              "start": "2009-01-01",
              "end": "2009-06-30",
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              "form": "10-Q",
              "filed": "2009-07-29"
            },
            {
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              "val": 6400000,
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              "form": "10-Q",
              "filed": "2009-10-29"
            },
            {
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              "filed": "2012-02-16",
              "frame": "CY2009"
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          ]
        }
      },
      "PaymentsToAcquireBusinessesGross": {
        "label": "Payments to Acquire Businesses, Gross",
        "description": "The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.",
        "units": {
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              "filed": "2017-02-09",
              "frame": "CY2014"
            },
            {
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            {
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            },
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            {
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            },
            {
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            {
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            {
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            {
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            },
            {
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              "filed": "2023-10-26"
            },
            {
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            },
            {
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            {
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            },
            {
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              "filed": "2024-10-30"
            },
            {
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              "val": 30053000,
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              "filed": "2024-04-24",
              "frame": "CY2024Q1"
            },
            {
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            {
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          ]
        }
      },
      "PaymentsToAcquireBusinessesNetOfCashAcquired": {
        "label": "Payments to Acquire Businesses, Net of Cash Acquired",
        "description": "The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.",
        "units": {
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            },
            {
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              "filed": "2020-02-27",
              "frame": "CY2017"
            },
            {
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            },
            {
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              "filed": "2020-02-27"
            },
            {
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              "filed": "2021-02-17",
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            },
            {
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            },
            {
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            },
            {
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            },
            {
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              "filed": "2022-04-28",
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            },
            {
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            {
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            {
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            {
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            {
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              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 2051,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2015"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 2385,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 2385,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2016"
            },
            {
              "start": "2017-01-01",
              "end": "2017-12-31",
              "val": 2225,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2017"
            }
          ]
        }
      },
      "ProvedDevelopedAndUndevelopedReserveProductionEnergy": {
        "label": "Proved Developed and Undeveloped Reserve, Production (Energy)",
        "description": "Energy measure of decrease in quantity of proved reserve of oil and gas resulting from production, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).",
        "units": {
          "Bcfe": [
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 488,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2014"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 619,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 619,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2015"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 776,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 776,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2016"
            },
            {
              "start": "2017-01-01",
              "end": "2017-12-31",
              "val": 908,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2017"
            }
          ]
        }
      },
      "ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy": {
        "label": "Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy)",
        "description": "Energy measure of increase (decrease) in quantity of proved reserve of oil and gas related to revision of a previous estimate resulting from new information, except for an increase in proved acreage, or change in economic factors, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).",
        "units": {
          "Bcfe": [
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 711,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2014"
            }
          ]
        }
      },
      "ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions": {
        "label": "Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions",
        "description": "Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields.",
        "units": {
          "MMcf": [
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 2046578,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11",
              "frame": "CY2013"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 3276054,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 3276054,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2014"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 2051071,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 2051071,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 2051071,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2015"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 2384682,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 2384682,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2016"
            },
            {
              "start": "2017-01-01",
              "end": "2017-12-31",
              "val": 2225141,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2017"
            }
          ]
        }
      },
      "ProvedDevelopedAndUndevelopedReservesNet": {
        "label": "Proved Developed and Undeveloped Reserves, Net",
        "description": "The net quantity of proved reserves as of the balance sheet date. Proved oil reserves are the estimated quantities of crude oil and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable.",
        "units": {
          "MMcf": [
            {
              "end": "2012-12-31",
              "val": 6004952,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2013-12-31",
              "val": 8348269,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "end": "2013-12-31",
              "val": 8348269,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2014-12-31",
              "val": 10738948,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "end": "2014-12-31",
              "val": 10738948,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "end": "2014-12-31",
              "val": 10738948,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2015-12-31",
              "val": 9976597,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "end": "2015-12-31",
              "val": 9976597,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "end": "2015-12-31",
              "val": 9976597,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2016-12-31",
              "val": 13508407,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "end": "2016-12-31",
              "val": 13508407,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2017-12-31",
              "val": 21445667,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2017Q4I"
            }
          ]
        }
      },
      "ProvedDevelopedAndUndevelopedReservesProduction": {
        "label": "Proved Developed and Undeveloped Reserves, Production",
        "description": "Production of proved reserves.",
        "units": {
          "MMcf": [
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 367113,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11",
              "frame": "CY2013"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 488080,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 488080,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2014"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 618686,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 618686,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 618686,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2015"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 776363,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 776363,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2016"
            },
            {
              "start": "2017-01-01",
              "end": "2017-12-31",
              "val": 907892,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2017"
            }
          ]
        }
      },
      "ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace": {
        "label": "Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place",
        "description": "Purchase of minerals in place.",
        "units": {
          "MMcf": [
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 472798,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11",
              "frame": "CY2013"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 102713,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 102713,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2014"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 0,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 0,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 0,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2015"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 2395776,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 2395776,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2016"
            },
            {
              "start": "2017-01-01",
              "end": "2017-12-31",
              "val": 9389638,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2017"
            }
          ]
        }
      },
      "ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease": {
        "label": "Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates",
        "description": "Revisions represent changes in previous estimates of proved reserves, either upward or downward, resulting from new information (except for an increase in proved acreage) normally obtained from development drilling and production history or resulting from change in economic factors.",
        "units": {
          "MMcf": [
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 191509,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11",
              "frame": "CY2013"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": -301351,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": -301351,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2014"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": -2194675,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": -2194675,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": -2194675,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2015"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": -472285,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": -472285,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2016"
            },
            {
              "start": "2017-01-01",
              "end": "2017-12-31",
              "val": -2766981,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2017"
            }
          ]
        }
      },
      "ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace": {
        "label": "Proved Developed and Undeveloped Reserves, Sales of Minerals in Place",
        "description": "Sales of minerals in place.",
        "units": {
          "MMcf": [
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 455,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11",
              "frame": "CY2013"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 198657,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 198657,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2014"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 61,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 61,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 61,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2015"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 0,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 0,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2016"
            },
            {
              "start": "2017-01-01",
              "end": "2017-12-31",
              "val": 2646,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2017"
            }
          ]
        }
      },
      "ProvedDevelopedReservesVolume": {
        "label": "Proved Developed Reserves (Volume)",
        "description": "Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. \"Net\" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in \"net\" quantities if the necessary information is available to the enterprise. \"Net\" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as \"barrels\" for oil and synthetic oil reserves or \"cubic feet\" or \"cubic meters\" for natural gas and synthetic gas reserves.",
        "units": {
          "MMcf": [
            {
              "end": "2012-12-31",
              "val": 2798381,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2013-12-31",
              "val": 3985687,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "end": "2013-12-31",
              "val": 3985687,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2014-12-31",
              "val": 4826387,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "end": "2014-12-31",
              "val": 4826387,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "end": "2014-12-31",
              "val": 4826387,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2015-12-31",
              "val": 6279557,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "end": "2015-12-31",
              "val": 6279557,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "end": "2015-12-31",
              "val": 6279557,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2016-12-31",
              "val": 6842958,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "end": "2016-12-31",
              "val": 6842958,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2017-12-31",
              "val": 11297956,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2017Q4I"
            }
          ]
        }
      },
      "ProvedUndevelopedReserveBOE1": {
        "label": "Proved Undeveloped Reserves (Energy)",
        "description": "Energy measure of proved undeveloped reserves of crude oil, including condensate and natural gas liquids, natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas.",
        "units": {
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              "val": 15300000,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12",
              "frame": "CY2014Q4I"
            }
          ]
        }
      },
      "ProvedUndevelopedReserveVolume": {
        "label": "Proved Undeveloped Reserve (Volume)",
        "description": "Net quantities of an enterprise's interests in proved undeveloped reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other renewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. \"Net\" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in \"net\" quantities if the necessary information is available to the enterprise. \"Net\" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as \"barrels\" for oil and synthetic oil reserves or \"cubic feet\" or \"cubic meters\" for natural gas and synthetic gas reserves.",
        "units": {
          "MMcf": [
            {
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              "val": 3206571,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2013-12-31",
              "val": 4362582,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "end": "2013-12-31",
              "val": 4362582,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2014-12-31",
              "val": 5912561,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "end": "2014-12-31",
              "val": 5912561,
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              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "end": "2014-12-31",
              "val": 5912561,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2015-12-31",
              "val": 3697040,
              "accn": "0000033213-16-000018",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-11"
            },
            {
              "end": "2015-12-31",
              "val": 3697040,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "end": "2015-12-31",
              "val": 3697040,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2016-12-31",
              "val": 6665449,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "end": "2016-12-31",
              "val": 6665449,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2017-12-31",
              "val": 10147711,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2017Q4I"
            }
          ]
        }
      },
      "ProvisionForDoubtfulAccounts": {
        "label": "Accounts Receivable, Credit Loss Expense (Reversal)",
        "description": "Amount of expense (reversal of expense) for expected credit loss on accounts receivable.",
        "units": {
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              "end": "2007-12-31",
              "val": 353000,
              "accn": "0001104659-10-007860",
              "fy": 2009,
              "fp": "FY",
              "form": "10-K",
              "filed": "2010-02-18",
              "frame": "CY2007"
            },
            {
              "start": "2008-01-01",
              "end": "2008-06-30",
              "val": 3922000,
              "accn": "0001104659-09-045570",
              "fy": 2009,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2009-07-29"
            },
            {
              "start": "2008-01-01",
              "end": "2008-09-30",
              "val": 8591000,
              "accn": "0001104659-09-061197",
              "fy": 2009,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2009-10-29"
            },
            {
              "start": "2008-01-01",
              "end": "2008-12-31",
              "val": 11744000,
              "accn": "0001104659-10-007860",
              "fy": 2009,
              "fp": "FY",
              "form": "10-K",
              "filed": "2010-02-18"
            },
            {
              "start": "2008-01-01",
              "end": "2008-12-31",
              "val": 11744000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24",
              "frame": "CY2008"
            },
            {
              "start": "2009-01-01",
              "end": "2009-03-31",
              "val": 1140000,
              "accn": "0001104659-10-022535",
              "fy": 2010,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2010-04-28",
              "frame": "CY2009Q1"
            },
            {
              "start": "2009-01-01",
              "end": "2009-06-30",
              "val": -1007000,
              "accn": "0001104659-09-045570",
              "fy": 2009,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2009-07-29"
            },
            {
              "start": "2009-01-01",
              "end": "2009-06-30",
              "val": -1007000,
              "accn": "0001104659-10-040530",
              "fy": 2010,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2010-07-29"
            },
            {
              "start": "2009-01-01",
              "end": "2009-09-30",
              "val": -2110000,
              "accn": "0001104659-09-061197",
              "fy": 2009,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2009-10-29"
            },
            {
              "start": "2009-01-01",
              "end": "2009-09-30",
              "val": -2110000,
              "accn": "0001104659-10-054336",
              "fy": 2010,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2010-10-28"
            },
            {
              "start": "2009-01-01",
              "end": "2009-12-31",
              "val": -1263000,
              "accn": "0001104659-10-007860",
              "fy": 2009,
              "fp": "FY",
              "form": "10-K",
              "filed": "2010-02-18"
            },
            {
              "start": "2009-01-01",
              "end": "2009-12-31",
              "val": -1263000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24"
            },
            {
              "start": "2009-01-01",
              "end": "2009-12-31",
              "val": -1263000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2009"
            },
            {
              "start": "2010-01-01",
              "end": "2010-03-31",
              "val": 4000000,
              "accn": "0001104659-10-022535",
              "fy": 2010,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2010-04-28"
            },
            {
              "start": "2010-01-01",
              "end": "2010-03-31",
              "val": 4000000,
              "accn": "0001104659-11-023731",
              "fy": 2011,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2011-04-28",
              "frame": "CY2010Q1"
            },
            {
              "start": "2010-01-01",
              "end": "2010-06-30",
              "val": 4061000,
              "accn": "0001104659-10-040530",
              "fy": 2010,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2010-07-29"
            },
            {
              "start": "2010-01-01",
              "end": "2010-06-30",
              "val": 4061000,
              "accn": "0001104659-11-041495",
              "fy": 2011,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2011-07-28"
            },
            {
              "start": "2010-01-01",
              "end": "2010-09-30",
              "val": 2917000,
              "accn": "0001104659-10-054336",
              "fy": 2010,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2010-10-28"
            },
            {
              "start": "2010-01-01",
              "end": "2010-09-30",
              "val": 2917000,
              "accn": "0001104659-11-058465",
              "fy": 2011,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2011-10-27"
            },
            {
              "start": "2010-01-01",
              "end": "2010-12-31",
              "val": 5134000,
              "accn": "0001104659-11-009751",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-24"
            },
            {
              "start": "2010-01-01",
              "end": "2010-12-31",
              "val": 5134000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16"
            },
            {
              "start": "2010-01-01",
              "end": "2010-12-31",
              "val": 5134000,
              "accn": "0001104659-13-012699",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-21",
              "frame": "CY2010"
            },
            {
              "start": "2011-01-01",
              "end": "2011-03-31",
              "val": 2717000,
              "accn": "0001104659-11-023731",
              "fy": 2011,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2011-04-28"
            },
            {
              "start": "2011-01-01",
              "end": "2011-03-31",
              "val": 2717000,
              "accn": "0001104659-12-029053",
              "fy": 2012,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2012-04-26",
              "frame": "CY2011Q1"
            },
            {
              "start": "2011-01-01",
              "end": "2011-06-30",
              "val": 1704000,
              "accn": "0001104659-11-041495",
              "fy": 2011,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2011-07-28"
            },
            {
              "start": "2011-01-01",
              "end": "2011-06-30",
              "val": 1704000,
              "accn": "0001104659-12-051449",
              "fy": 2012,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2012-07-26"
            },
            {
              "start": "2011-01-01",
              "end": "2011-09-30",
              "val": -176000,
              "accn": "0001104659-11-058465",
              "fy": 2011,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2011-10-27"
            },
            {
              "start": "2011-01-01",
              "end": "2011-09-30",
              "val": -176000,
              "accn": "0001104659-12-071186",
              "fy": 2012,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2012-10-25"
            },
            {
              "start": "2011-01-01",
              "end": "2011-12-31",
              "val": 1581000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16"
            },
            {
              "start": "2011-01-01",
              "end": "2011-12-31",
              "val": 1581000,
              "accn": "0001104659-13-012699",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-21"
            },
            {
              "start": "2011-01-01",
              "end": "2011-12-31",
              "val": 1581000,
              "accn": "0001104659-14-011816",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-20",
              "frame": "CY2011"
            },
            {
              "start": "2012-01-01",
              "end": "2012-03-31",
              "val": 196000,
              "accn": "0001104659-12-029053",
              "fy": 2012,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2012-04-26"
            },
            {
              "start": "2012-01-01",
              "end": "2012-03-31",
              "val": 196000,
              "accn": "0001104659-13-032980",
              "fy": 2013,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2013-04-25",
              "frame": "CY2012Q1"
            },
            {
              "start": "2012-01-01",
              "end": "2012-06-30",
              "val": -2638000,
              "accn": "0001104659-12-051449",
              "fy": 2012,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2012-07-26"
            },
            {
              "start": "2012-01-01",
              "end": "2012-06-30",
              "val": -2638000,
              "accn": "0001104659-13-056665",
              "fy": 2013,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2013-07-25"
            },
            {
              "start": "2012-01-01",
              "end": "2012-09-30",
              "val": -3187000,
              "accn": "0001104659-12-071186",
              "fy": 2012,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2012-10-25"
            },
            {
              "start": "2012-01-01",
              "end": "2012-09-30",
              "val": -3187000,
              "accn": "0001104659-13-077631",
              "fy": 2013,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2013-10-24"
            },
            {
              "start": "2012-01-01",
              "end": "2012-12-31",
              "val": -1235000,
              "accn": "0001104659-13-012699",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-21"
            },
            {
              "start": "2012-01-01",
              "end": "2012-12-31",
              "val": -1235000,
              "accn": "0001104659-14-011816",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-20"
            },
            {
              "start": "2012-01-01",
              "end": "2012-12-31",
              "val": -1235000,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12",
              "frame": "CY2012"
            },
            {
              "start": "2013-01-01",
              "end": "2013-03-31",
              "val": 1962000,
              "accn": "0001104659-13-032980",
              "fy": 2013,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2013-04-25"
            },
            {
              "start": "2013-01-01",
              "end": "2013-03-31",
              "val": 1962000,
              "accn": "0001104659-14-029892",
              "fy": 2014,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2014-04-24",
              "frame": "CY2013Q1"
            },
            {
              "start": "2013-01-01",
              "end": "2013-06-30",
              "val": 2246000,
              "accn": "0001104659-13-056665",
              "fy": 2013,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2013-07-25"
            },
            {
              "start": "2013-01-01",
              "end": "2013-06-30",
              "val": 2246000,
              "accn": "0001104659-14-053274",
              "fy": 2014,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2014-07-24"
            },
            {
              "start": "2013-01-01",
              "end": "2013-09-30",
              "val": 986000,
              "accn": "0001104659-13-077631",
              "fy": 2013,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2013-10-24"
            },
            {
              "start": "2013-01-01",
              "end": "2013-09-30",
              "val": 986000,
              "accn": "0000033213-14-000004",
              "fy": 2014,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2014-10-23"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 2957000,
              "accn": "0001104659-14-011816",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-20"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 2957000,
              "accn": "0000033213-15-000004",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-12"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 2957000,
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      },
      "RestrictedCash": {
        "label": "Restricted Cash",
        "description": "Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.",
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        "label": "Restricted Cash and Cash Equivalents",
        "description": "Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
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        "label": "Restricted Cash and Investments, Current",
        "description": "The current cash, cash equivalents and investments that are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes current cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal.",
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        "label": "Restricted Cash and Investments, Noncurrent",
        "description": "The noncurrent cash, cash equivalents and investments that is restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits classified as long-term; that is not expected to be released from such existing restrictions within one year of the balance sheet date or operating cycle, whichever is longer. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes noncurrent cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal.",
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              "start": "2022-01-01",
              "end": "2022-12-31",
              "val": 393022000,
              "accn": "0000033213-23-000008",
              "fy": 2022,
              "fp": "FY",
              "form": "10-K",
              "filed": "2023-02-16"
            },
            {
              "start": "2022-01-01",
              "end": "2022-12-31",
              "val": 393022000,
              "accn": "0000033213-24-000008",
              "fy": 2023,
              "fp": "FY",
              "form": "10-K",
              "filed": "2024-02-14"
            },
            {
              "start": "2022-01-01",
              "end": "2022-12-31",
              "val": 393022000,
              "accn": "0000033213-25-000011",
              "fy": 2024,
              "fp": "FY",
              "form": "10-K",
              "filed": "2025-02-19",
              "frame": "CY2022"
            },
            {
              "start": "2023-01-01",
              "end": "2023-03-31",
              "val": 201029000,
              "accn": "0000033213-23-000017",
              "fy": 2023,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2023-04-27"
            },
            {
              "start": "2023-01-01",
              "end": "2023-03-31",
              "val": 201029000,
              "accn": "0000033213-24-000021",
              "fy": 2024,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2024-04-24",
              "frame": "CY2023Q1"
            },
            {
              "start": "2023-01-01",
              "end": "2023-06-30",
              "val": 201029000,
              "accn": "0000033213-23-000028",
              "fy": 2023,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2023-07-26"
            },
            {
              "start": "2023-01-01",
              "end": "2023-06-30",
              "val": 201029000,
              "accn": "0000033213-24-000032",
              "fy": 2024,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2024-07-24"
            },
            {
              "start": "2023-01-01",
              "end": "2023-09-30",
              "val": 201029000,
              "accn": "0000033213-23-000041",
              "fy": 2023,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2023-10-26"
            },
            {
              "start": "2023-01-01",
              "end": "2023-09-30",
              "val": 201029000,
              "accn": "0000033213-24-000047",
              "fy": 2024,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2024-10-30"
            },
            {
              "start": "2023-01-01",
              "end": "2023-12-31",
              "val": 201029000,
              "accn": "0000033213-24-000008",
              "fy": 2023,
              "fp": "FY",
              "form": "10-K",
              "filed": "2024-02-14"
            },
            {
              "start": "2023-01-01",
              "end": "2023-12-31",
              "val": 201029000,
              "accn": "0000033213-25-000011",
              "fy": 2024,
              "fp": "FY",
              "form": "10-K",
              "filed": "2025-02-19"
            },
            {
              "start": "2023-01-01",
              "end": "2023-12-31",
              "val": 201029000,
              "accn": "0000033213-26-000018",
              "fy": 2025,
              "fp": "FY",
              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2023"
            }
          ]
        }
      },
      "StockRepurchasedDuringPeriodShares": {
        "label": "Stock Repurchased During Period, Shares",
        "description": "Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.",
        "units": {
          "shares": [
            {
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              "end": "2018-09-30",
              "val": 9946382,
              "accn": "0000033213-18-000014",
              "fy": 2018,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2018-10-25",
              "frame": "CY2018Q3"
            },
            {
              "start": "2024-01-01",
              "end": "2024-12-31",
              "val": 0,
              "accn": "0000033213-25-000011",
              "fy": 2024,
              "fp": "FY",
              "form": "10-K",
              "filed": "2025-02-19"
            },
            {
              "start": "2024-01-01",
              "end": "2024-12-31",
              "val": 0,
              "accn": "0000033213-26-000018",
              "fy": 2025,
              "fp": "FY",
              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2024"
            },
            {
              "start": "2025-01-01",
              "end": "2025-12-31",
              "val": 0,
              "accn": "0000033213-26-000018",
              "fy": 2025,
              "fp": "FY",
              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2025"
            }
          ]
        }
      },
      "StockRepurchasedDuringPeriodValue": {
        "label": "Stock Repurchased During Period, Value",
        "description": "Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.",
        "units": {
          "USD": [
            {
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              "end": "2016-03-31",
              "val": 10000,
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              "fy": 2016,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2016-04-28",
              "frame": "CY2016Q1"
            }
          ]
        }
      },
      "StockRepurchaseProgramAuthorizedAmount1": {
        "label": "Stock Repurchase Program, Authorized Amount",
        "description": "Amount of stock repurchase plan authorized.",
        "units": {
          "USD": [
            {
              "end": "2018-09-30",
              "val": 500000000,
              "accn": "0000033213-18-000014",
              "fy": 2018,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2018-10-25",
              "frame": "CY2018Q3I"
            }
          ]
        }
      },
      "SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions": {
        "label": "Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions",
        "description": "Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.",
        "units": {
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            {
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              "end": "2012-07-02",
              "val": 0.594,
              "accn": "0001104659-13-012699",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-21"
            },
            {
              "start": "2012-07-01",
              "end": "2012-07-02",
              "val": 0.594,
              "accn": "0001104659-12-071186",
              "fy": 2012,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2012-10-25"
            },
            {
              "start": "2012-01-01",
              "end": "2012-09-30",
              "val": 0.594,
              "accn": "0001104659-12-071186",
              "fy": 2012,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2012-10-25"
            }
          ]
        }
      },
      "TaxCreditCarryforwardAmount": {
        "label": "Tax Credit Carryforward, Amount",
        "description": "The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.",
        "units": {
          "USD": [
            {
              "end": "2011-12-31",
              "val": 65500000,
              "accn": "0001104659-12-010579",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-16",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2012-12-31",
              "val": 69900000,
              "accn": "0001104659-13-012699",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-21",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2018-12-31",
              "val": 295000000,
              "accn": "0000033213-19-000006",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-14",
              "frame": "CY2018Q4I"
            },
            {
              "end": "2019-12-31",
              "val": 95000000,
              "accn": "0000033213-20-000008",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-27",
              "frame": "CY2019Q4I"
            }
          ]
        }
      },
      "TaxCreditCarryforwardValuationAllowance": {
        "label": "Tax Credit Carryforward, Valuation Allowance",
        "description": "Amount of valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from tax credit carryforwards for which it is more likely than not that a tax benefit will not be realized.",
        "units": {
          "USD": [
            {
              "end": "2018-12-31",
              "val": 13300000,
              "accn": "0000033213-20-000008",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-27",
              "frame": "CY2018Q4I"
            },
            {
              "end": "2018-12-31",
              "val": 13300000,
              "accn": "0000033213-19-000006",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-14"
            }
          ]
        }
      },
      "TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect": {
        "label": "Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect",
        "description": "Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act.",
        "units": {
          "USD": [
            {
              "start": "2018-01-01",
              "end": "2018-12-31",
              "val": 0,
              "accn": "0000033213-21-000006",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2021-02-17",
              "frame": "CY2018"
            },
            {
              "start": "2019-01-01",
              "end": "2019-12-31",
              "val": -496000,
              "accn": "0000033213-21-000006",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2021-02-17"
            },
            {
              "start": "2019-01-01",
              "end": "2019-12-31",
              "val": -496000,
              "accn": "0000033213-22-000007",
              "fy": 2021,
              "fp": "FY",
              "form": "10-K",
              "filed": "2022-02-10"
            },
            {
              "start": "2019-01-01",
              "end": "2019-12-31",
              "val": -496000,
              "accn": "0000033213-22-000015",
              "fy": null,
              "fp": null,
              "form": "8-K",
              "filed": "2022-04-28",
              "frame": "CY2019"
            },
            {
              "start": "2020-01-01",
              "end": "2020-12-31",
              "val": 0,
              "accn": "0000033213-21-000006",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2021-02-17"
            },
            {
              "start": "2020-01-01",
              "end": "2020-12-31",
              "val": 0,
              "accn": "0000033213-22-000007",
              "fy": 2021,
              "fp": "FY",
              "form": "10-K",
              "filed": "2022-02-10"
            },
            {
              "start": "2020-01-01",
              "end": "2020-12-31",
              "val": 0,
              "accn": "0000033213-22-000015",
              "fy": null,
              "fp": null,
              "form": "8-K",
              "filed": "2022-04-28",
              "frame": "CY2020"
            },
            {
              "start": "2021-01-01",
              "end": "2021-12-31",
              "val": 0,
              "accn": "0000033213-22-000007",
              "fy": 2021,
              "fp": "FY",
              "form": "10-K",
              "filed": "2022-02-10"
            },
            {
              "start": "2021-01-01",
              "end": "2021-12-31",
              "val": 0,
              "accn": "0000033213-22-000015",
              "fy": null,
              "fp": null,
              "form": "8-K",
              "filed": "2022-04-28",
              "frame": "CY2021"
            }
          ]
        }
      },
      "TaxesPayableCurrentAndNoncurrent": {
        "label": "Taxes Payable",
        "description": "Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes.",
        "units": {
          "USD": [
            {
              "end": "2019-12-31",
              "val": 0,
              "accn": "0000033213-21-000006",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2021-02-17",
              "frame": "CY2019Q4I"
            },
            {
              "end": "2020-12-31",
              "val": 23909000,
              "accn": "0000033213-21-000006",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2021-02-17",
              "frame": "CY2020Q4I"
            }
          ]
        }
      },
      "TradingSecurities": {
        "label": "Debt Securities, Trading, and Equity Securities, FV-NI",
        "description": "Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).",
        "units": {
          "USD": [
            {
              "end": "2015-12-31",
              "val": 0,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2016-12-31",
              "val": 286396000,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2016-12-31",
              "val": 286396000,
              "accn": "0000033213-17-000012",
              "fy": 2017,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2017-10-26"
            },
            {
              "end": "2016-12-31",
              "val": 286396000,
              "accn": "0000033213-17-000009",
              "fy": 2017,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2017-07-27"
            },
            {
              "end": "2016-12-31",
              "val": 286396000,
              "accn": "0000033213-17-000006",
              "fy": 2017,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2017-04-27"
            },
            {
              "end": "2016-12-31",
              "val": 286396000,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "end": "2017-03-31",
              "val": 0,
              "accn": "0000033213-17-000006",
              "fy": 2017,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2017-04-27",
              "frame": "CY2017Q1I"
            },
            {
              "end": "2017-06-30",
              "val": 0,
              "accn": "0000033213-17-000009",
              "fy": 2017,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2017-07-27",
              "frame": "CY2017Q2I"
            },
            {
              "end": "2017-09-30",
              "val": 0,
              "accn": "0000033213-17-000012",
              "fy": 2017,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2017-10-26",
              "frame": "CY2017Q3I"
            },
            {
              "end": "2017-12-31",
              "val": 0,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2017Q4I"
            }
          ]
        }
      },
      "TradingSecuritiesUnrealizedHoldingGainLoss": {
        "label": "Trading Securities, Change in Unrealized Holding Gain (Loss)",
        "description": "Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.",
        "units": {
          "USD": [
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 1500000,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2016"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 1500000,
              "accn": "0000033213-17-000003",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-09"
            },
            {
              "start": "2017-01-01",
              "end": "2017-12-31",
              "val": -2600000,
              "accn": "0000033213-18-000003",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-15",
              "frame": "CY2017"
            }
          ]
        }
      },
      "TransferToInvestments": {
        "label": "Transfer to Investments",
        "description": "Value of investments transferred to the entity's investments in noncash transactions.",
        "units": {
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            {
              "start": "2015-01-01",
              "end": "2015-03-31",
              "val": 0,
              "accn": "0000033213-16-000022",
              "fy": 2016,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2016-04-28",
              "frame": "CY2015Q1"
            },
            {
              "start": "2015-01-01",
              "end": "2015-06-30",
              "val": 0,
              "accn": "0000033213-16-000026",
              "fy": 2016,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2016-07-28"
            },
            {
              "start": "2015-01-01",
              "end": "2015-09-30",
              "val": 0,
              "accn": "0000033213-16-000029",
              "fy": 2016,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2016-10-27"
            },
            {
              "start": "2016-01-01",
              "end": "2016-03-31",
              "val": 13864000,
              "accn": "0000033213-16-000022",
              "fy": 2016,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2016-04-28",
              "frame": "CY2016Q1"
            },
            {
              "start": "2016-01-01",
              "end": "2016-06-30",
              "val": 27052000,
              "accn": "0000033213-16-000026",
              "fy": 2016,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2016-07-28"
            },
            {
              "start": "2016-01-01",
              "end": "2016-09-30",
              "val": 13095000,
              "accn": "0000033213-16-000029",
              "fy": 2016,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2016-10-27"
            }
          ]
        }
      },
      "TreasuryStockAcquiredAverageCostPerShare": {
        "label": "Treasury Stock Acquired, Average Cost Per Share",
        "description": "Total cost of shares repurchased divided by the total number of shares repurchased.",
        "units": {
          "USD/shares": [
            {
              "start": "2018-07-01",
              "end": "2018-09-30",
              "val": 50.29,
              "accn": "0000033213-18-000014",
              "fy": 2018,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2018-10-25",
              "frame": "CY2018Q3"
            },
            {
              "start": "2018-01-01",
              "end": "2018-12-31",
              "val": 50.62,
              "accn": "0000033213-21-000006",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2021-02-17",
              "frame": "CY2018"
            },
            {
              "start": "2018-01-01",
              "end": "2018-12-31",
              "val": 50.62,
              "accn": "0000033213-20-000008",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-27"
            },
            {
              "start": "2018-01-01",
              "end": "2018-12-31",
              "val": 50.62,
              "accn": "0000033213-19-000006",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-14"
            }
          ]
        }
      },
      "TreasuryStockShares": {
        "label": "Treasury Stock, Shares",
        "description": "Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.",
        "units": {
          "shares": [
            {
              "end": "2008-12-31",
              "val": 26764000,
              "accn": "0001104659-09-045570",
              "fy": 2009,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2009-07-29"
            },
            {
              "end": "2008-12-31",
              "val": 26764000,
              "accn": "0001104659-09-061197",
              "fy": 2009,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2009-10-29"
            },
            {
              "end": "2008-12-31",
              "val": 26764000,
              "accn": "0001104659-10-007860",
              "fy": 2009,
              "fp": "FY",
              "form": "10-K",
              "filed": "2010-02-18",
              "frame": "CY2008Q4I"
            },
            {
              "end": "2009-06-30",
              "val": 26727000,
              "accn": "0001104659-09-045570",
              "fy": 2009,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2009-07-29",
              "frame": "CY2009Q2I"
            },
            {
              "end": "2009-09-30",
              "val": 26711000,
              "accn": "0001104659-09-061197",
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        "description": "Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "units": {
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            {
              "end": "2024-12-31",
              "val": 4523000,
              "accn": "0000033213-25-000011",
              "fy": 2024,
              "fp": "FY",
              "form": "10-K",
              "filed": "2025-02-19",
              "frame": "CY2024Q4I"
            },
            {
              "end": "2025-12-31",
              "val": 4697000,
              "accn": "0000033213-26-000018",
              "fy": 2025,
              "fp": "FY",
              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2025Q4I"
            }
          ]
        }
      },
      "FinanceLeaseLiabilityPaymentsDueYearFour": {
        "label": "Finance Lease, Liability, to be Paid, Year Four",
        "description": "Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "units": {
          "USD": [
            {
              "end": "2024-12-31",
              "val": 4806000,
              "accn": "0000033213-25-000011",
              "fy": 2024,
              "fp": "FY",
              "form": "10-K",
              "filed": "2025-02-19",
              "frame": "CY2024Q4I"
            },
            {
              "end": "2025-12-31",
              "val": 5879000,
              "accn": "0000033213-26-000018",
              "fy": 2025,
              "fp": "FY",
              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2025Q4I"
            }
          ]
        }
      },
      "FinanceLeaseLiabilityPaymentsDueYearThree": {
        "label": "Finance Lease, Liability, to be Paid, Year Three",
        "description": "Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "units": {
          "USD": [
            {
              "end": "2024-12-31",
              "val": 6057000,
              "accn": "0000033213-25-000011",
              "fy": 2024,
              "fp": "FY",
              "form": "10-K",
              "filed": "2025-02-19",
              "frame": "CY2024Q4I"
            },
            {
              "end": "2025-12-31",
              "val": 7058000,
              "accn": "0000033213-26-000018",
              "fy": 2025,
              "fp": "FY",
              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2025Q4I"
            }
          ]
        }
      },
      "FinanceLeaseLiabilityPaymentsDueYearTwo": {
        "label": "Finance Lease, Liability, to be Paid, Year Two",
        "description": "Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "units": {
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              "val": 6420000,
              "accn": "0000033213-25-000011",
              "fy": 2024,
              "fp": "FY",
              "form": "10-K",
              "filed": "2025-02-19",
              "frame": "CY2024Q4I"
            },
            {
              "end": "2025-12-31",
              "val": 8355000,
              "accn": "0000033213-26-000018",
              "fy": 2025,
              "fp": "FY",
              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2025Q4I"
            }
          ]
        }
      },
      "FinanceLeaseLiabilityUndiscountedExcessAmount": {
        "label": "Finance Lease, Liability, Undiscounted Excess Amount",
        "description": "Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for finance lease.",
        "units": {
          "USD": [
            {
              "end": "2024-12-31",
              "val": 6258000,
              "accn": "0000033213-25-000011",
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              "fp": "FY",
              "form": "10-K",
              "filed": "2025-02-19",
              "frame": "CY2024Q4I"
            },
            {
              "end": "2025-12-31",
              "val": 5361000,
              "accn": "0000033213-26-000018",
              "fy": 2025,
              "fp": "FY",
              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2025Q4I"
            }
          ]
        }
      },
      "FinanceLeaseRightOfUseAsset": {
        "label": "Finance Lease, Right-of-Use Asset, after Accumulated Amortization",
        "description": "Amount, after accumulated amortization, of right-of-use asset from finance lease.",
        "units": {
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              "val": 6494000,
              "accn": "0000033213-25-000011",
              "fy": 2024,
              "fp": "FY",
              "form": "10-K",
              "filed": "2025-02-19",
              "frame": "CY2023Q4I"
            },
            {
              "end": "2024-12-31",
              "val": 34803000,
              "accn": "0000033213-25-000011",
              "fy": 2024,
              "fp": "FY",
              "form": "10-K",
              "filed": "2025-02-19"
            },
            {
              "end": "2024-12-31",
              "val": 34803000,
              "accn": "0000033213-26-000018",
              "fy": 2025,
              "fp": "FY",
              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2024Q4I"
            },
            {
              "end": "2025-12-31",
              "val": 35650000,
              "accn": "0000033213-26-000018",
              "fy": 2025,
              "fp": "FY",
              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2025Q4I"
            }
          ]
        }
      },
      "LesseeFinanceLeaseDiscountRate": {
        "label": "Lessee, Finance Lease, Discount Rate",
        "description": "Discount rate used by lessee to determine present value of finance lease payments.",
        "units": {
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              "val": 0.039,
              "accn": "0000033213-25-000011",
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              "fp": "FY",
              "form": "10-K",
              "filed": "2025-02-19",
              "frame": "CY2022Q4I"
            },
            {
              "end": "2023-12-31",
              "val": 0.048,
              "accn": "0000033213-25-000011",
              "fy": 2024,
              "fp": "FY",
              "form": "10-K",
              "filed": "2025-02-19"
            },
            {
              "end": "2023-12-31",
              "val": 0.048,
              "accn": "0000033213-26-000018",
              "fy": 2025,
              "fp": "FY",
              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2023Q4I"
            },
            {
              "end": "2024-12-31",
              "val": 0.051,
              "accn": "0000033213-25-000011",
              "fy": 2024,
              "fp": "FY",
              "form": "10-K",
              "filed": "2025-02-19"
            },
            {
              "end": "2024-12-31",
              "val": 0.051,
              "accn": "0000033213-26-000018",
              "fy": 2025,
              "fp": "FY",
              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2024Q4I"
            },
            {
              "end": "2025-12-31",
              "val": 0.051,
              "accn": "0000033213-26-000018",
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              "fp": "FY",
              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2025Q4I"
            }
          ]
        }
      },
      "OperatingLeaseLiabilityNoncurrent": {
        "label": "Operating Lease, Liability, Noncurrent",
        "description": "Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.",
        "units": {
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              "val": 8443000,
              "accn": "0000033213-25-000011",
              "fy": 2024,
              "fp": "FY",
              "form": "10-K",
              "filed": "2025-02-19",
              "frame": "CY2023Q4I"
            },
            {
              "end": "2024-12-31",
              "val": 29391000,
              "accn": "0000033213-25-000011",
              "fy": 2024,
              "fp": "FY",
              "form": "10-K",
              "filed": "2025-02-19"
            },
            {
              "end": "2024-12-31",
              "val": 29391000,
              "accn": "0000033213-26-000018",
              "fy": 2025,
              "fp": "FY",
              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2024Q4I"
            },
            {
              "end": "2025-12-31",
              "val": 27369000,
              "accn": "0000033213-26-000018",
              "fy": 2025,
              "fp": "FY",
              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2025Q4I"
            }
          ]
        }
      },
      "PaymentsToAcquireAssetsInvestingActivities": {
        "label": "Payments to Acquire Assets, Investing Activities",
        "description": "Aggregate cash payments for a combination of transactions that are classified as investing activities in which assets, which may include securities, other types of investments, or productive assets, are purchased from third-party sellers. This element can be used by entities to aggregate payments for all asset purchases that are classified as investing activities.",
        "units": {
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              "end": "2024-03-31",
              "val": 0,
              "accn": "0000033213-25-000023",
              "fy": 2025,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2025-04-23",
              "frame": "CY2024Q1"
            },
            {
              "start": "2025-01-01",
              "end": "2025-03-31",
              "val": 6449000,
              "accn": "0000033213-25-000023",
              "fy": 2025,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2025-04-23",
              "frame": "CY2025Q1"
            }
          ]
        }
      },
      "StockGrantedDuringPeriodValueSharebasedCompensationForfeited": {
        "label": "Shares Granted, Value, Share-based Payment Arrangement, Forfeited",
        "description": "Value of forfeited shares granted under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).",
        "units": {
          "USD": [
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              "start": "2024-01-01",
              "end": "2024-03-31",
              "val": 22008000,
              "accn": "0000033213-25-000023",
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              "fp": "Q1",
              "form": "10-Q",
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              "frame": "CY2024Q1"
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            {
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              "form": "10-Q",
              "filed": "2025-07-23"
            },
            {
              "start": "2025-01-01",
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              "val": 30968000,
              "accn": "0000033213-25-000023",
              "fy": 2025,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2025-04-23",
              "frame": "CY2025Q1"
            },
            {
              "start": "2025-01-01",
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              "accn": "0000033213-25-000033",
              "fy": 2025,
              "fp": "Q2",
              "form": "10-Q",
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          ]
        }
      },
      "IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable": {
        "label": "Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable",
        "description": "The increase (decrease) during the reporting period in the amounts payable to taxing authorities for taxes that are based on the reporting entity's earnings, net of amounts receivable from taxing authorities for refunds of overpayments or recoveries of income taxes.",
        "units": {
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              "form": "10-K",
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              "accn": "0000033213-25-000033",
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              "form": "10-Q",
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            },
            {
              "start": "2024-01-01",
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              "form": "10-Q",
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            {
              "start": "2024-01-01",
              "end": "2024-12-31",
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              "accn": "0000033213-26-000018",
              "fy": 2025,
              "fp": "FY",
              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2024"
            },
            {
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              "val": 97378000,
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              "fy": 2025,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2025-07-23"
            },
            {
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              "end": "2025-06-30",
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              "accn": "0000033213-26-000043",
              "fy": 2026,
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              "form": "10-Q",
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            },
            {
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              "val": 97378000,
              "accn": "0000033213-25-000049",
              "fy": 2025,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2025-10-22"
            },
            {
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              "val": 73028000,
              "accn": "0000033213-26-000018",
              "fy": 2025,
              "fp": "FY",
              "form": "10-K",
              "filed": "2026-02-18",
              "frame": "CY2025"
            },
            {
              "start": "2026-01-01",
              "end": "2026-06-30",
              "val": 25320000,
              "accn": "0000033213-26-000043",
              "fy": 2026,
              "fp": "Q2",
              "form": "10-Q",
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          ]
        }
      },
      "StockGrantedDuringPeriodValueSharebasedCompensation": {
        "label": "Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture",
        "description": "Value, after forfeiture, of shares granted under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).",
        "units": {
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              "val": 13616000,
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              "form": "10-Q",
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            },
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              "accn": "0000033213-25-000033",
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              "form": "10-Q",
              "filed": "2025-07-23",
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            }
          ]
        }
      },
      "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable": {
        "label": "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable",
        "description": "Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date.",
        "units": {
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              "val": 3082000,
              "accn": "0000033213-25-000049",
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          ]
        }
      },
      "DividendsCommonStockCash": {
        "label": "Dividends, Common Stock, Cash",
        "description": "Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.",
        "units": {
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            {
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            {
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            {
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            {
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            {
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            {
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              "frame": "CY2025"
            },
            {
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              "accn": "0000033213-26-000030",
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              "frame": "CY2026Q1"
            },
            {
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            {
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              "accn": "0000033213-26-000043",
              "fy": 2026,
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              "form": "10-Q",
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              "frame": "CY2026Q2"
            }
          ]
        }
      },
      "WeightedAverageNumberDilutedSharesOutstandingAdjustment": {
        "label": "Weighted Average Number Diluted Shares Outstanding Adjustment",
        "description": "The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.",
        "units": {
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              "end": "2024-09-30",
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            {
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              "form": "10-Q",
              "filed": "2025-10-22",
              "frame": "CY2024Q3"
            },
            {
              "start": "2025-01-01",
              "end": "2025-09-30",
              "val": 4182000,
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            {
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              "end": "2025-09-30",
              "val": 3792000,
              "accn": "0000033213-25-000049",
              "fy": 2025,
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              "form": "10-Q",
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