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              "fy": 2019,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2018-06-04",
              "frame": "CY2017Q1I"
            },
            {
              "end": "2017-07-31",
              "val": 7183000000,
              "accn": "0000104169-17-000057",
              "fy": 2018,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2017-08-31"
            },
            {
              "end": "2017-07-31",
              "val": 7183000000,
              "accn": "0000104169-18-000086",
              "fy": 2019,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2018-09-06",
              "frame": "CY2017Q2I"
            },
            {
              "end": "2017-10-31",
              "val": 7144000000,
              "accn": "0000104169-17-000081",
              "fy": 2018,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2017-12-01"
            },
            {
              "end": "2017-10-31",
              "val": 7144000000,
              "accn": "0000104169-18-000110",
              "fy": 2019,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2018-11-30",
              "frame": "CY2017Q3I"
            },
            {
              "end": "2018-01-31",
              "val": 7143000000,
              "accn": "0000104169-18-000028",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-03-30"
            },
            {
              "end": "2018-01-31",
              "val": 7143000000,
              "accn": "0000104169-18-000054",
              "fy": 2019,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2018-06-04"
            },
            {
              "end": "2018-01-31",
              "val": 7143000000,
              "accn": "0000104169-18-000086",
              "fy": 2019,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2018-09-06"
            },
            {
              "end": "2018-01-31",
              "val": 7143000000,
              "accn": "0000104169-18-000110",
              "fy": 2019,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2018-11-30"
            },
            {
              "end": "2018-01-31",
              "val": 7143000000,
              "accn": "0000104169-19-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-03-28",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2018-04-30",
              "val": 7178000000,
              "accn": "0000104169-18-000054",
              "fy": 2019,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2018-06-04"
            },
            {
              "end": "2018-04-30",
              "val": 7178000000,
              "accn": "0000104169-19-000024",
              "fy": 2020,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-06-07",
              "frame": "CY2018Q1I"
            },
            {
              "end": "2018-07-31",
              "val": 6998000000,
              "accn": "0000104169-18-000086",
              "fy": 2019,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2018-09-06"
            },
            {
              "end": "2018-07-31",
              "val": 6998000000,
              "accn": "0000104169-19-000064",
              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-09-06",
              "frame": "CY2018Q2I"
            },
            {
              "end": "2018-10-31",
              "val": 6991000000,
              "accn": "0000104169-18-000110",
              "fy": 2019,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2018-11-30"
            },
            {
              "end": "2018-10-31",
              "val": 6991000000,
              "accn": "0000104169-19-000088",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-12-04",
              "frame": "CY2018Q3I"
            },
            {
              "end": "2019-01-31",
              "val": 7078000000,
              "accn": "0000104169-19-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-03-28"
            },
            {
              "end": "2019-01-31",
              "val": 7078000000,
              "accn": "0000104169-19-000024",
              "fy": 2020,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-06-07"
            },
            {
              "end": "2019-01-31",
              "val": 7078000000,
              "accn": "0000104169-19-000064",
              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-09-06"
            },
            {
              "end": "2019-01-31",
              "val": 7078000000,
              "accn": "0000104169-19-000088",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-12-04"
            },
            {
              "end": "2019-01-31",
              "val": 7078000000,
              "accn": "0000104169-20-000011",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-03-20",
              "frame": "CY2018Q4I"
            },
            {
              "end": "2019-04-30",
              "val": 0,
              "accn": "0000104169-19-000024",
              "fy": 2020,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-06-07",
              "frame": "CY2019Q1I"
            },
            {
              "end": "2019-07-31",
              "val": 0,
              "accn": "0000104169-19-000064",
              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-09-06",
              "frame": "CY2019Q2I"
            },
            {
              "end": "2019-10-31",
              "val": 0,
              "accn": "0000104169-19-000088",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-12-04",
              "frame": "CY2019Q3I"
            },
            {
              "end": "2020-01-31",
              "val": 0,
              "accn": "0000104169-20-000011",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-03-20",
              "frame": "CY2019Q4I"
            }
          ]
        }
      },
      "CapitalLeasesFutureMinimumPaymentsDue": {
        "label": "Capital Leases, Future Minimum Payments Due",
        "description": "Amount of minimum lease payments for capital leases.",
        "units": {
          "USD": [
            {
              "end": "2011-01-31",
              "val": 5916000000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2012-01-31",
              "val": 5935000000,
              "accn": "0001193125-12-134679",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-03-27",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2013-01-31",
              "val": 6268000000,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2014-01-31",
              "val": 6291000000,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2015-01-31",
              "val": 5454000000,
              "accn": "0000104169-15-000011",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-04-01",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2016-01-31",
              "val": 8655000000,
              "accn": "0000104169-16-000079",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-03-30",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2017-01-31",
              "val": 8909000000,
              "accn": "0000104169-17-000021",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-03-31",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2018-01-31",
              "val": 9930000000,
              "accn": "0000104169-18-000028",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-03-30",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2019-01-31",
              "val": 9896000000,
              "accn": "0000104169-19-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-03-28"
            },
            {
              "end": "2019-01-31",
              "val": 9896000000,
              "accn": "0000104169-19-000024",
              "fy": 2020,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-06-07"
            },
            {
              "end": "2019-01-31",
              "val": 9896000000,
              "accn": "0000104169-19-000064",
              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-09-06"
            },
            {
              "end": "2019-01-31",
              "val": 9896000000,
              "accn": "0000104169-19-000088",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-12-04"
            },
            {
              "end": "2019-01-31",
              "val": 9896000000,
              "accn": "0000104169-20-000011",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-03-20",
              "frame": "CY2018Q4I"
            }
          ]
        }
      },
      "CapitalLeasesFutureMinimumPaymentsDueCurrent": {
        "label": "Capital Leases, Future Minimum Payments Due, Next Twelve Months",
        "description": "Amount of minimum lease payments for capital leases 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": "2011-01-31",
              "val": 609000000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2012-01-31",
              "val": 608000000,
              "accn": "0001193125-12-134679",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-03-27",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2013-01-31",
              "val": 620000000,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2014-01-31",
              "val": 586000000,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2015-01-31",
              "val": 504000000,
              "accn": "0000104169-15-000011",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-04-01",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2016-01-31",
              "val": 815000000,
              "accn": "0000104169-16-000079",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-03-30",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2017-01-31",
              "val": 894000000,
              "accn": "0000104169-17-000021",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-03-31",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2018-01-31",
              "val": 1039000000,
              "accn": "0000104169-18-000028",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-03-30",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2019-01-31",
              "val": 917000000,
              "accn": "0000104169-19-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-03-28"
            },
            {
              "end": "2019-01-31",
              "val": 917000000,
              "accn": "0000104169-19-000024",
              "fy": 2020,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-06-07"
            },
            {
              "end": "2019-01-31",
              "val": 917000000,
              "accn": "0000104169-19-000064",
              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-09-06"
            },
            {
              "end": "2019-01-31",
              "val": 917000000,
              "accn": "0000104169-19-000088",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-12-04"
            },
            {
              "end": "2019-01-31",
              "val": 917000000,
              "accn": "0000104169-20-000011",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-03-20",
              "frame": "CY2018Q4I"
            }
          ]
        }
      },
      "CapitalLeasesFutureMinimumPaymentsDueInFiveYears": {
        "label": "Capital Leases, Future Minimum Payments Due in Five Years",
        "description": "Amount of minimum lease payments for capital leases 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": "2011-01-31",
              "val": 462000000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2012-01-31",
              "val": 457000000,
              "accn": "0001193125-12-134679",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-03-27",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2013-01-31",
              "val": 449000000,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2014-01-31",
              "val": 438000000,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2015-01-31",
              "val": 370000000,
              "accn": "0000104169-15-000011",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-04-01",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2016-01-31",
              "val": 624000000,
              "accn": "0000104169-16-000079",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-03-30",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2017-01-31",
              "val": 652000000,
              "accn": "0000104169-17-000021",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-03-31",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2018-01-31",
              "val": 696000000,
              "accn": "0000104169-18-000028",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-03-30",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2019-01-31",
              "val": 593000000,
              "accn": "0000104169-19-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-03-28"
            },
            {
              "end": "2019-01-31",
              "val": 593000000,
              "accn": "0000104169-19-000024",
              "fy": 2020,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-06-07"
            },
            {
              "end": "2019-01-31",
              "val": 593000000,
              "accn": "0000104169-19-000064",
              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-09-06"
            },
            {
              "end": "2019-01-31",
              "val": 593000000,
              "accn": "0000104169-19-000088",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-12-04"
            },
            {
              "end": "2019-01-31",
              "val": 593000000,
              "accn": "0000104169-20-000011",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-03-20",
              "frame": "CY2018Q4I"
            }
          ]
        }
      },
      "CapitalLeasesFutureMinimumPaymentsDueInFourYears": {
        "label": "Capital Leases, Future Minimum Payments Due in Four Years",
        "description": "Amount of minimum lease payments for capital leases 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": "2011-01-31",
              "val": 496000000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2012-01-31",
              "val": 497000000,
              "accn": "0001193125-12-134679",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-03-27",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2013-01-31",
              "val": 490000000,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2014-01-31",
              "val": 479000000,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2015-01-31",
              "val": 408000000,
              "accn": "0000104169-15-000011",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-04-01",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2016-01-31",
              "val": 655000000,
              "accn": "0000104169-16-000079",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-03-30",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2017-01-31",
              "val": 743000000,
              "accn": "0000104169-17-000021",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-03-31",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2018-01-31",
              "val": 843000000,
              "accn": "0000104169-18-000028",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-03-30",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2019-01-31",
              "val": 667000000,
              "accn": "0000104169-19-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-03-28"
            },
            {
              "end": "2019-01-31",
              "val": 667000000,
              "accn": "0000104169-19-000024",
              "fy": 2020,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-06-07"
            },
            {
              "end": "2019-01-31",
              "val": 667000000,
              "accn": "0000104169-19-000064",
              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-09-06"
            },
            {
              "end": "2019-01-31",
              "val": 667000000,
              "accn": "0000104169-19-000088",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-12-04"
            },
            {
              "end": "2019-01-31",
              "val": 667000000,
              "accn": "0000104169-20-000011",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-03-20",
              "frame": "CY2018Q4I"
            }
          ]
        }
      },
      "CapitalLeasesFutureMinimumPaymentsDueInThreeYears": {
        "label": "Capital Leases, Future Minimum Payments Due in Three Years",
        "description": "Amount of minimum lease payments for capital leases 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": "2011-01-31",
              "val": 545000000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2012-01-31",
              "val": 532000000,
              "accn": "0001193125-12-134679",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-03-27",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2013-01-31",
              "val": 535000000,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2014-01-31",
              "val": 519000000,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2015-01-31",
              "val": 444000000,
              "accn": "0000104169-15-000011",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-04-01",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2016-01-31",
              "val": 710000000,
              "accn": "0000104169-16-000079",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-03-30",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2017-01-31",
              "val": 786000000,
              "accn": "0000104169-17-000021",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-03-31",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2018-01-31",
              "val": 942000000,
              "accn": "0000104169-18-000028",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-03-30",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2019-01-31",
              "val": 794000000,
              "accn": "0000104169-19-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-03-28"
            },
            {
              "end": "2019-01-31",
              "val": 794000000,
              "accn": "0000104169-19-000024",
              "fy": 2020,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-06-07"
            },
            {
              "end": "2019-01-31",
              "val": 794000000,
              "accn": "0000104169-19-000064",
              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-09-06"
            },
            {
              "end": "2019-01-31",
              "val": 794000000,
              "accn": "0000104169-19-000088",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-12-04"
            },
            {
              "end": "2019-01-31",
              "val": 794000000,
              "accn": "0000104169-20-000011",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-03-20",
              "frame": "CY2018Q4I"
            }
          ]
        }
      },
      "CapitalLeasesFutureMinimumPaymentsDueInTwoYears": {
        "label": "Capital Leases, Future Minimum Payments Due in Two Years",
        "description": "Amount of minimum lease payments for capital leases 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": "2011-01-31",
              "val": 574000000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2012-01-31",
              "val": 580000000,
              "accn": "0001193125-12-134679",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-03-27",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2013-01-31",
              "val": 584000000,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2014-01-31",
              "val": 558000000,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2015-01-31",
              "val": 476000000,
              "accn": "0000104169-15-000011",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-04-01",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2016-01-31",
              "val": 758000000,
              "accn": "0000104169-16-000079",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-03-30",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2017-01-31",
              "val": 838000000,
              "accn": "0000104169-17-000021",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-03-31",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2018-01-31",
              "val": 987000000,
              "accn": "0000104169-18-000028",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-03-30",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2019-01-31",
              "val": 856000000,
              "accn": "0000104169-19-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-03-28"
            },
            {
              "end": "2019-01-31",
              "val": 856000000,
              "accn": "0000104169-19-000024",
              "fy": 2020,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-06-07"
            },
            {
              "end": "2019-01-31",
              "val": 856000000,
              "accn": "0000104169-19-000064",
              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-09-06"
            },
            {
              "end": "2019-01-31",
              "val": 856000000,
              "accn": "0000104169-19-000088",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-12-04"
            },
            {
              "end": "2019-01-31",
              "val": 856000000,
              "accn": "0000104169-20-000011",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-03-20",
              "frame": "CY2018Q4I"
            }
          ]
        }
      },
      "CapitalLeasesFutureMinimumPaymentsDueThereafter": {
        "label": "Capital Leases, Future Minimum Payments Due Thereafter",
        "description": "Amount of minimum lease payments for capital leases due after 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": "2011-01-31",
              "val": 3230000000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2012-01-31",
              "val": 3261000000,
              "accn": "0001193125-12-134679",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-03-27",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2013-01-31",
              "val": 3590000000,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2014-01-31",
              "val": 3711000000,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2015-01-31",
              "val": 3252000000,
              "accn": "0000104169-15-000011",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-04-01",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2016-01-31",
              "val": 5093000000,
              "accn": "0000104169-16-000079",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-03-30",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2017-01-31",
              "val": 4996000000,
              "accn": "0000104169-17-000021",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-03-31",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2018-01-31",
              "val": 5423000000,
              "accn": "0000104169-18-000028",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-03-30",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2019-01-31",
              "val": 6069000000,
              "accn": "0000104169-19-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-03-28"
            },
            {
              "end": "2019-01-31",
              "val": 6069000000,
              "accn": "0000104169-19-000024",
              "fy": 2020,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-06-07"
            },
            {
              "end": "2019-01-31",
              "val": 6069000000,
              "accn": "0000104169-19-000064",
              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-09-06"
            },
            {
              "end": "2019-01-31",
              "val": 6069000000,
              "accn": "0000104169-19-000088",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-12-04"
            },
            {
              "end": "2019-01-31",
              "val": 6069000000,
              "accn": "0000104169-20-000011",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-03-20",
              "frame": "CY2018Q4I"
            }
          ]
        }
      },
      "CapitalLeasesFutureMinimumPaymentsExecutoryCosts": {
        "label": "Capital Leases, Future Minimum Payments, Executory Costs",
        "description": "Amounts to be paid by lessee to lessor for maintenance, insurance, and tax expenses related to the leased asset.",
        "units": {
          "USD": [
            {
              "end": "2011-01-31",
              "val": 51000000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2012-01-31",
              "val": 50000000,
              "accn": "0001193125-12-134679",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-03-27",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2013-01-31",
              "val": 55000000,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2014-01-31",
              "val": 60000000,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2015-01-31",
              "val": 49000000,
              "accn": "0000104169-15-000011",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-04-01",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2016-01-31",
              "val": 39000000,
              "accn": "0000104169-16-000079",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-03-30",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2017-01-31",
              "val": 30000000,
              "accn": "0000104169-17-000021",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-03-31",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2018-01-31",
              "val": 27000000,
              "accn": "0000104169-18-000028",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-03-30",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2019-01-31",
              "val": 23000000,
              "accn": "0000104169-19-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-03-28"
            },
            {
              "end": "2019-01-31",
              "val": 23000000,
              "accn": "0000104169-19-000024",
              "fy": 2020,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-06-07"
            },
            {
              "end": "2019-01-31",
              "val": 23000000,
              "accn": "0000104169-19-000064",
              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-09-06"
            },
            {
              "end": "2019-01-31",
              "val": 23000000,
              "accn": "0000104169-19-000088",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-12-04"
            },
            {
              "end": "2019-01-31",
              "val": 23000000,
              "accn": "0000104169-20-000011",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-03-20",
              "frame": "CY2018Q4I"
            }
          ]
        }
      },
      "CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments": {
        "label": "Capital Leases, Future Minimum Payments, Interest Included in Payments",
        "description": "Amount necessary to reduce net minimum lease payments to present value for capital leases.",
        "units": {
          "USD": [
            {
              "end": "2011-01-31",
              "val": 2379000000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2012-01-31",
              "val": 2550000000,
              "accn": "0001193125-12-134679",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-03-27",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2013-01-31",
              "val": 2863000000,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2014-01-31",
              "val": 3134000000,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2015-01-31",
              "val": 2512000000,
              "accn": "0000104169-15-000011",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-04-01",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2016-01-31",
              "val": 3319000000,
              "accn": "0000104169-16-000079",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-03-30",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2017-01-31",
              "val": 3372000000,
              "accn": "0000104169-17-000021",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-03-31",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2018-01-31",
              "val": 3567000000,
              "accn": "0000104169-18-000028",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-03-30",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2019-01-31",
              "val": 4739000000,
              "accn": "0000104169-19-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-03-28"
            },
            {
              "end": "2019-01-31",
              "val": 4739000000,
              "accn": "0000104169-19-000024",
              "fy": 2020,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-06-07"
            },
            {
              "end": "2019-01-31",
              "val": 4739000000,
              "accn": "0000104169-19-000064",
              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-09-06"
            },
            {
              "end": "2019-01-31",
              "val": 4739000000,
              "accn": "0000104169-19-000088",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-12-04"
            },
            {
              "end": "2019-01-31",
              "val": 4739000000,
              "accn": "0000104169-20-000011",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-03-20",
              "frame": "CY2018Q4I"
            }
          ]
        }
      },
      "CapitalLeasesFutureMinimumPaymentsNetMinimumPayments": {
        "label": "Capital Leases, Future Minimum Payments, Net Minimum Payments (Deprecated 2012-01-31)",
        "description": "The total contractually required rental payments on capitalized leases net of deductions for: (i) executory costs, including any profit thereon, included in the minimum lease payments and (ii) the amount of imputed interest necessary to reduce the net minimum lease payments to present value.",
        "units": {
          "USD": [
            {
              "end": "2011-01-31",
              "val": 5865000000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2012-01-31",
              "val": 5885000000,
              "accn": "0001193125-12-134679",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-03-27",
              "frame": "CY2011Q4I"
            }
          ]
        }
      },
      "CapitalLeasesFutureMinimumPaymentsNetMinimumPayments1": {
        "label": "Capital Leases, Future Minimum Payments, Net Minimum Payments",
        "description": "Amount of minimum lease payments for capital leases net of executory costs, which include amounts paid by the lessee to the lessor for insurance, maintenance and taxes.",
        "units": {
          "USD": [
            {
              "end": "2019-01-31",
              "val": 9873000000,
              "accn": "0000104169-19-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-03-28"
            },
            {
              "end": "2019-01-31",
              "val": 9873000000,
              "accn": "0000104169-19-000024",
              "fy": 2020,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-06-07"
            },
            {
              "end": "2019-01-31",
              "val": 9873000000,
              "accn": "0000104169-19-000064",
              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-09-06"
            },
            {
              "end": "2019-01-31",
              "val": 9873000000,
              "accn": "0000104169-19-000088",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-12-04"
            },
            {
              "end": "2019-01-31",
              "val": 9873000000,
              "accn": "0000104169-20-000011",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-03-20",
              "frame": "CY2018Q4I"
            }
          ]
        }
      },
      "CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments": {
        "label": "Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments",
        "description": "Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes.",
        "units": {
          "USD": [
            {
              "end": "2011-01-31",
              "val": 3486000000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2012-01-31",
              "val": 3335000000,
              "accn": "0001193125-12-134679",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-03-27",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2013-01-31",
              "val": 6213000000,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2014-01-31",
              "val": 6231000000,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2015-01-31",
              "val": 5405000000,
              "accn": "0000104169-15-000011",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-04-01",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2016-01-31",
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              "frame": "CY2013"
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              "filed": "2017-03-31",
              "frame": "CY2014"
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            {
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              "val": 9454000000,
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              "val": 9454000000,
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              "form": "10-K",
              "filed": "2017-03-31"
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            {
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              "val": 10080000000,
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              "filed": "2017-03-31"
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            {
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              "val": 10080000000,
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              "filed": "2018-03-30"
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            {
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              "val": 10080000000,
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              "form": "10-K",
              "filed": "2019-03-28",
              "frame": "CY2016"
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            {
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              "val": 10529000000,
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            {
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              "fy": 2020,
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            {
              "end": "2019-01-31",
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            {
              "end": "2019-04-30",
              "val": 209000000,
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        "label": "Derivative, Collateral, Right to Reclaim Cash",
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        "units": {
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              "end": "2018-01-31",
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              "fy": 2018,
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              "filed": "2018-03-30"
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              "end": "2018-01-31",
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              "fy": 2019,
              "fp": "FY",
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              "filed": "2019-03-28",
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            {
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              "filed": "2019-03-28",
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      },
      "DerivativeFairValueOfDerivativeNet": {
        "label": "Derivative, Fair Value, Net",
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              "filed": "2020-12-02",
              "frame": "CY2019Q4I"
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            {
              "end": "2020-10-31",
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            {
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            {
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            {
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          ]
        }
      },
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        "label": "Finance Lease, Liability, Payment, Due",
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              "frame": "CY2019Q4I"
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        }
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              "frame": "CY2025Q4I"
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              "form": "10-Q",
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              "filed": "2020-03-20",
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              "filed": "2025-03-14",
              "frame": "CY2024Q4I"
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              "frame": "CY2019Q3I"
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              "frame": "CY2019Q4I"
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              "filed": "2024-03-15",
              "frame": "CY2023Q4I"
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              "fy": 2025,
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              "frame": "CY2024Q4I"
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              "accn": "0000104169-26-000055",
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              "frame": "CY2025Q4I"
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              "frame": "CY2019Q1I"
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              "fy": 2020,
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              "form": "10-Q",
              "filed": "2019-09-06",
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              "filed": "2020-03-20",
              "frame": "CY2019Q4I"
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              "end": "2021-01-31",
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              "frame": "CY2021Q4I"
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              "end": "2023-01-31",
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              "accn": "0000104169-23-000020",
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              "filed": "2023-03-17",
              "frame": "CY2022Q4I"
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              "frame": "CY2023Q4I"
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              "end": "2025-01-31",
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              "accn": "0000104169-25-000021",
              "fy": 2025,
              "fp": "FY",
              "form": "10-K",
              "filed": "2025-03-14",
              "frame": "CY2024Q4I"
            },
            {
              "end": "2026-01-31",
              "val": 1132000000,
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        "label": "Finance Lease, Right-of-Use Asset, Amortization",
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              "end": "2022-01-31",
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        "label": "Financing Receivable (Deprecated 2012-01-31)",
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              "start": "2012-02-01",
              "end": "2013-01-31",
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            {
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              "fy": 2013,
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              "form": "10-K",
              "filed": "2014-03-21"
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              "start": "2012-02-01",
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              "form": "10-K",
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              "fy": 2013,
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            {
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              "form": "10-K",
              "filed": "2017-03-31"
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            {
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              "form": "10-K",
              "filed": "2018-03-30",
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            {
              "start": "2016-02-01",
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              "val": 2600000000,
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              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-03-31"
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            {
              "start": "2016-02-01",
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              "val": 2600000000,
              "accn": "0000104169-18-000028",
              "fy": 2018,
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              "filed": "2018-03-30"
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            {
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              "filed": "2019-03-28",
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              "val": 2900000000,
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              "fy": 2018,
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              "form": "10-K",
              "filed": "2018-03-30"
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            {
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              "form": "10-K",
              "filed": "2020-03-20",
              "frame": "CY2017"
            },
            {
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              "accn": "0000104169-19-000016",
              "fy": 2019,
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              "form": "10-K",
              "filed": "2019-03-28"
            },
            {
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              "val": 3000000000,
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              "fy": 2020,
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              "form": "10-K",
              "filed": "2020-03-20",
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      },
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        "label": "Lessee, Operating Lease, Liability, to be Paid",
        "description": "Amount of lessee's undiscounted obligation for lease payment for operating lease.",
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              "filed": "2014-09-05"
            },
            {
              "end": "2014-01-31",
              "val": 89000000,
              "accn": "0000104169-14-000080",
              "fy": 2015,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2014-12-01"
            },
            {
              "end": "2014-01-31",
              "val": 89000000,
              "accn": "0000104169-15-000011",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-04-01",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2014-04-30",
              "val": 70000000,
              "accn": "0000104169-14-000033",
              "fy": 2015,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2014-06-06"
            },
            {
              "end": "2014-04-30",
              "val": 70000000,
              "accn": "0000104169-15-000022",
              "fy": 2016,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2015-06-05",
              "frame": "CY2014Q1I"
            },
            {
              "end": "2014-07-31",
              "val": 0,
              "accn": "0000104169-14-000057",
              "fy": 2015,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2014-09-05",
              "frame": "CY2014Q2I"
            },
            {
              "end": "2014-10-31",
              "val": 0,
              "accn": "0000104169-14-000080",
              "fy": 2015,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2014-12-01",
              "frame": "CY2014Q3I"
            },
            {
              "end": "2015-01-31",
              "val": 0,
              "accn": "0000104169-15-000011",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-04-01"
            },
            {
              "end": "2015-01-31",
              "val": 0,
              "accn": "0000104169-15-000022",
              "fy": 2016,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2015-06-05",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2015-04-30",
              "val": 0,
              "accn": "0000104169-15-000022",
              "fy": 2016,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2015-06-05",
              "frame": "CY2015Q1I"
            },
            {
              "end": "2020-01-31",
              "val": 0,
              "accn": "0000104169-21-000033",
              "fy": 2021,
              "fp": "FY",
              "form": "10-K",
              "filed": "2021-03-19",
              "frame": "CY2019Q4I"
            },
            {
              "end": "2021-01-31",
              "val": 12734000000,
              "accn": "0000104169-21-000033",
              "fy": 2021,
              "fp": "FY",
              "form": "10-K",
              "filed": "2021-03-19"
            },
            {
              "end": "2021-01-31",
              "val": 12734000000,
              "accn": "0000104169-22-000012",
              "fy": 2022,
              "fp": "FY",
              "form": "10-K",
              "filed": "2022-03-18",
              "frame": "CY2020Q4I"
            },
            {
              "end": "2022-01-31",
              "val": 21000000,
              "accn": "0000104169-22-000012",
              "fy": 2022,
              "fp": "FY",
              "form": "10-K",
              "filed": "2022-03-18",
              "frame": "CY2021Q4I"
            }
          ]
        }
      },
      "LineOfCredit": {
        "label": "Long-term Line of Credit",
        "description": "The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.",
        "units": {
          "USD": [
            {
              "end": "2019-01-31",
              "val": 0,
              "accn": "0000104169-19-000088",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-12-04",
              "frame": "CY2018Q4I"
            },
            {
              "end": "2019-10-31",
              "val": 0,
              "accn": "0000104169-19-000088",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-12-04",
              "frame": "CY2019Q3I"
            }
          ]
        }
      },
      "LineOfCreditFacilityAmountOutstanding": {
        "label": "Line of Credit Facility, Amount Outstanding (Deprecated 2014-01-31)",
        "description": "Amount borrowed under the credit facility as of the balance sheet date.",
        "units": {
          "USD": [
            {
              "end": "2011-01-31",
              "val": 11500000000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2012-01-31",
              "val": 18500000000,
              "accn": "0001193125-12-134679",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-03-27",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2013-01-31",
              "val": 18100000000,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2013-01-31",
              "val": 18100000000,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26"
            },
            {
              "end": "2014-01-31",
              "val": 17300000000,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2013Q4I"
            }
          ]
        }
      },
      "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.",
        "units": {
          "USD": [
            {
              "end": "2012-01-31",
              "val": 18483000000,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2013-01-31",
              "val": 18129000000,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26"
            },
            {
              "end": "2013-01-31",
              "val": 18129000000,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2014-01-31",
              "val": 17283000000,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21"
            },
            {
              "end": "2014-01-31",
              "val": 15400000000,
              "accn": "0000104169-15-000011",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-04-01",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2015-01-31",
              "val": 15000000000,
              "accn": "0000104169-15-000011",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-04-01"
            },
            {
              "end": "2015-01-31",
              "val": 15000000000,
              "accn": "0000104169-16-000079",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-03-30",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2016-01-31",
              "val": 15000000000,
              "accn": "0000104169-16-000079",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-03-30"
            },
            {
              "end": "2016-01-31",
              "val": 15000000000,
              "accn": "0000104169-17-000021",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-03-31",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2017-01-31",
              "val": 12500000000,
              "accn": "0000104169-17-000021",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-03-31"
            },
            {
              "end": "2017-01-31",
              "val": 12500000000,
              "accn": "0000104169-18-000028",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-03-30",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2018-01-31",
              "val": 12500000000,
              "accn": "0000104169-18-000028",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-03-30"
            },
            {
              "end": "2018-01-31",
              "val": 12500000000,
              "accn": "0000104169-18-000086",
              "fy": 2019,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2018-09-06"
            },
            {
              "end": "2018-01-31",
              "val": 12500000000,
              "accn": "0000104169-18-000110",
              "fy": 2019,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2018-11-30"
            },
            {
              "end": "2018-01-31",
              "val": 12500000000,
              "accn": "0000104169-19-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-03-28",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2018-07-31",
              "val": 15000000000,
              "accn": "0000104169-18-000086",
              "fy": 2019,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2018-09-06"
            },
            {
              "end": "2018-07-31",
              "val": 15000000000,
              "accn": "0000104169-19-000064",
              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-09-06",
              "frame": "CY2018Q2I"
            },
            {
              "end": "2018-10-31",
              "val": 15000000000,
              "accn": "0000104169-18-000110",
              "fy": 2019,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2018-11-30",
              "frame": "CY2018Q3I"
            },
            {
              "end": "2019-01-31",
              "val": 15000000000,
              "accn": "0000104169-19-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-03-28"
            },
            {
              "end": "2019-01-31",
              "val": 15000000000,
              "accn": "0000104169-19-000088",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-12-04",
              "frame": "CY2018Q4I"
            },
            {
              "end": "2019-07-31",
              "val": 15000000000,
              "accn": "0000104169-19-000064",
              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-09-06",
              "frame": "CY2019Q2I"
            },
            {
              "end": "2019-10-31",
              "val": 15000000000,
              "accn": "0000104169-19-000088",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-12-04",
              "frame": "CY2019Q3I"
            }
          ]
        }
      },
      "LitigationSettlementGross": {
        "label": "Litigation Settlement, Gross (Deprecated 2013-01-31)",
        "description": "This element represents the gross amount awarded, to be received by, or to be remitted to the entity in settlement of litigation occurring during the period.",
        "units": {
          "USD": [
            {
              "start": "2006-09-01",
              "end": "2007-11-14",
              "val": 188000000,
              "accn": "0001193125-10-274171",
              "fy": 2010,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2010-12-06"
            },
            {
              "start": "2006-09-01",
              "end": "2007-11-14",
              "val": 188000000,
              "accn": "0001193125-10-202779",
              "fy": 2010,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2010-09-01"
            }
          ]
        }
      },
      "LongTermDebt": {
        "label": "Long-term Debt",
        "description": "Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.",
        "units": {
          "USD": [
            {
              "end": "2010-01-31",
              "val": 37281000000,
              "accn": "0001193125-10-202779",
              "fy": 2010,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2010-09-01"
            },
            {
              "end": "2010-01-31",
              "val": 37281000000,
              "accn": "0001193125-10-274171",
              "fy": 2010,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2010-12-06"
            },
            {
              "end": "2010-01-31",
              "val": 37281000000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2009Q4I"
            },
            {
              "end": "2010-07-31",
              "val": 41175000000,
              "accn": "0001193125-10-202779",
              "fy": 2010,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2010-09-01",
              "frame": "CY2010Q2I"
            },
            {
              "end": "2010-10-31",
              "val": 45999000000,
              "accn": "0001193125-10-274171",
              "fy": 2010,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2010-12-06",
              "frame": "CY2010Q3I"
            },
            {
              "end": "2011-01-31",
              "val": 45347000000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30"
            },
            {
              "end": "2011-01-31",
              "val": 45347000000,
              "accn": "0001193125-11-158587",
              "fy": 2011,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2011-06-03"
            },
            {
              "end": "2011-01-31",
              "val": 45347000000,
              "accn": "0001193125-11-238857",
              "fy": 2011,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2011-09-01"
            },
            {
              "end": "2011-01-31",
              "val": 45347000000,
              "accn": "0001193125-11-335177",
              "fy": 2011,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2011-12-08"
            },
            {
              "end": "2011-01-31",
              "val": 45347000000,
              "accn": "0001193125-12-134679",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-03-27",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2011-04-30",
              "val": 48659000000,
              "accn": "0001193125-11-158587",
              "fy": 2011,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2011-06-03",
              "frame": "CY2011Q1I"
            },
            {
              "end": "2011-07-31",
              "val": 47025000000,
              "accn": "0001193125-11-238857",
              "fy": 2011,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2011-09-01",
              "frame": "CY2011Q2I"
            },
            {
              "end": "2011-10-31",
              "val": 46342000000,
              "accn": "0001193125-11-335177",
              "fy": 2011,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2011-12-08",
              "frame": "CY2011Q3I"
            },
            {
              "end": "2012-01-31",
              "val": 46045000000,
              "accn": "0001193125-12-134679",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-03-27"
            },
            {
              "end": "2012-01-31",
              "val": 46045000000,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2013-01-31",
              "val": 43981000000,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26"
            },
            {
              "end": "2013-01-31",
              "val": 43981000000,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2014-01-31",
              "val": 45874000000,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21"
            },
            {
              "end": "2014-01-31",
              "val": 45874000000,
              "accn": "0000104169-15-000011",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-04-01",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2015-01-31",
              "val": 45896000000,
              "accn": "0000104169-15-000011",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-04-01"
            },
            {
              "end": "2015-01-31",
              "val": 45680000000,
              "accn": "0000104169-16-000079",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-03-30",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2016-01-31",
              "val": 40959000000,
              "accn": "0000104169-16-000079",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-03-30"
            },
            {
              "end": "2016-01-31",
              "val": 40959000000,
              "accn": "0000104169-17-000021",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-03-31",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2017-01-31",
              "val": 38271000000,
              "accn": "0000104169-17-000021",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-03-31"
            },
            {
              "end": "2017-01-31",
              "val": 38271000000,
              "accn": "0000104169-18-000028",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-03-30",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2018-01-31",
              "val": 33783000000,
              "accn": "0000104169-18-000028",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-03-30"
            },
            {
              "end": "2018-01-31",
              "val": 33783000000,
              "accn": "0000104169-19-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-03-28",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2019-01-31",
              "val": 45396000000,
              "accn": "0000104169-19-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-03-28"
            },
            {
              "end": "2019-01-31",
              "val": 45396000000,
              "accn": "0000104169-19-000064",
              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-09-06"
            },
            {
              "end": "2019-01-31",
              "val": 45396000000,
              "accn": "0000104169-19-000088",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-12-04"
            },
            {
              "end": "2019-01-31",
              "val": 45396000000,
              "accn": "0000104169-20-000011",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-03-20",
              "frame": "CY2018Q4I"
            },
            {
              "end": "2019-07-31",
              "val": 48800000000,
              "accn": "0000104169-19-000064",
              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-09-06",
              "frame": "CY2019Q2I"
            },
            {
              "end": "2019-10-31",
              "val": 49005000000,
              "accn": "0000104169-19-000088",
              "fy": 2020,
              "fp": "Q3",
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            {
              "end": "2025-10-31",
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              "end": "2026-01-31",
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              "form": "10-K",
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            },
            {
              "end": "2026-01-31",
              "val": 14750000000,
              "accn": "0000104169-26-000102",
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              "fp": "Q1",
              "form": "10-Q",
              "filed": "2026-05-29",
              "frame": "CY2025Q4I"
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            {
              "end": "2026-04-30",
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              "fy": 2027,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2026-05-29",
              "frame": "CY2026Q1I"
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        }
      },
      "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.",
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              "val": 14123000000,
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              "filed": "2017-03-31",
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            {
              "end": "2018-01-31",
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              "filed": "2018-03-30",
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              "fy": 2019,
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              "form": "10-K",
              "filed": "2019-03-28"
            },
            {
              "end": "2019-01-31",
              "val": 14118000000,
              "accn": "0000104169-19-000024",
              "fy": 2020,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-06-07"
            },
            {
              "end": "2019-01-31",
              "val": 14118000000,
              "accn": "0000104169-19-000064",
              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-09-06"
            },
            {
              "end": "2019-01-31",
              "val": 14118000000,
              "accn": "0000104169-19-000088",
              "fy": 2020,
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              "form": "10-Q",
              "filed": "2019-12-04"
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            {
              "end": "2019-01-31",
              "val": 14118000000,
              "accn": "0000104169-20-000011",
              "fy": 2020,
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              "filed": "2020-03-20",
              "frame": "CY2018Q4I"
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        }
      },
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        "label": "Operating Leases, Future Minimum Payments Due, Next Twelve Months",
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              "form": "10-K",
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              "filed": "2013-03-26",
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              "fy": 2016,
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              "filed": "2016-03-30",
              "frame": "CY2015Q4I"
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              "accn": "0000104169-17-000021",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-03-31",
              "frame": "CY2016Q4I"
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            {
              "end": "2018-01-31",
              "val": 1933000000,
              "accn": "0000104169-18-000028",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-03-30",
              "frame": "CY2017Q4I"
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              "end": "2019-01-31",
              "val": 1856000000,
              "accn": "0000104169-19-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-03-28"
            },
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              "end": "2019-01-31",
              "val": 1856000000,
              "accn": "0000104169-19-000024",
              "fy": 2020,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-06-07"
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            {
              "end": "2019-01-31",
              "val": 1856000000,
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              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-09-06"
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              "end": "2019-01-31",
              "val": 1856000000,
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              "form": "10-Q",
              "filed": "2019-12-04"
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              "end": "2019-01-31",
              "val": 1856000000,
              "accn": "0000104169-20-000011",
              "fy": 2020,
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              "filed": "2020-03-20",
              "frame": "CY2018Q4I"
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      },
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              "val": 1120000000,
              "accn": "0001193125-11-083157",
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              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2010Q4I"
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              "accn": "0001193125-12-134679",
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              "filed": "2012-03-27",
              "frame": "CY2011Q4I"
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              "fy": 2012,
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              "form": "10-K",
              "filed": "2013-03-26",
              "frame": "CY2012Q4I"
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              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2013Q4I"
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            {
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              "val": 1236000000,
              "accn": "0000104169-15-000011",
              "fy": 2015,
              "fp": "FY",
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              "filed": "2015-04-01",
              "frame": "CY2014Q4I"
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            {
              "end": "2016-01-31",
              "val": 1530000000,
              "accn": "0000104169-16-000079",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-03-30",
              "frame": "CY2015Q4I"
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            {
              "end": "2017-01-31",
              "val": 1342000000,
              "accn": "0000104169-17-000021",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-03-31",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2018-01-31",
              "val": 1158000000,
              "accn": "0000104169-18-000028",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-03-30",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2019-01-31",
              "val": 1063000000,
              "accn": "0000104169-19-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-03-28"
            },
            {
              "end": "2019-01-31",
              "val": 1063000000,
              "accn": "0000104169-19-000024",
              "fy": 2020,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-06-07"
            },
            {
              "end": "2019-01-31",
              "val": 1063000000,
              "accn": "0000104169-19-000064",
              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-09-06"
            },
            {
              "end": "2019-01-31",
              "val": 1063000000,
              "accn": "0000104169-19-000088",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-12-04"
            },
            {
              "end": "2019-01-31",
              "val": 1063000000,
              "accn": "0000104169-20-000011",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-03-20",
              "frame": "CY2018Q4I"
            }
          ]
        }
      },
      "OperatingLeasesFutureMinimumPaymentsDueInFourYears": {
        "label": "Operating Leases, Future Minimum Payments, Due in Four Years",
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              "val": 1205000000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2012-01-31",
              "val": 1428000000,
              "accn": "0001193125-12-134679",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-03-27",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2013-01-31",
              "val": 1384000000,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2014-01-31",
              "val": 1314000000,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2015-01-31",
              "val": 1354000000,
              "accn": "0000104169-15-000011",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-04-01",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2016-01-31",
              "val": 1697000000,
              "accn": "0000104169-16-000079",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-03-30",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2017-01-31",
              "val": 1524000000,
              "accn": "0000104169-17-000021",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-03-31",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2018-01-31",
              "val": 1381000000,
              "accn": "0000104169-18-000028",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-03-30",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2019-01-31",
              "val": 1233000000,
              "accn": "0000104169-19-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-03-28"
            },
            {
              "end": "2019-01-31",
              "val": 1233000000,
              "accn": "0000104169-19-000024",
              "fy": 2020,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-06-07"
            },
            {
              "end": "2019-01-31",
              "val": 1233000000,
              "accn": "0000104169-19-000064",
              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-09-06"
            },
            {
              "end": "2019-01-31",
              "val": 1233000000,
              "accn": "0000104169-19-000088",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-12-04"
            },
            {
              "end": "2019-01-31",
              "val": 1233000000,
              "accn": "0000104169-20-000011",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-03-20",
              "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": "2011-01-31",
              "val": 1271000000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2012-01-31",
              "val": 1525000000,
              "accn": "0001193125-12-134679",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-03-27",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2013-01-31",
              "val": 1480000000,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2014-01-31",
              "val": 1462000000,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2015-01-31",
              "val": 1482000000,
              "accn": "0000104169-15-000011",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-04-01",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2016-01-31",
              "val": 1794000000,
              "accn": "0000104169-16-000079",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-03-30",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2017-01-31",
              "val": 1679000000,
              "accn": "0000104169-17-000021",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-03-31",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2018-01-31",
              "val": 1532000000,
              "accn": "0000104169-18-000028",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-03-30",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2019-01-31",
              "val": 1420000000,
              "accn": "0000104169-19-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-03-28"
            },
            {
              "end": "2019-01-31",
              "val": 1420000000,
              "accn": "0000104169-19-000024",
              "fy": 2020,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-06-07"
            },
            {
              "end": "2019-01-31",
              "val": 1420000000,
              "accn": "0000104169-19-000064",
              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-09-06"
            },
            {
              "end": "2019-01-31",
              "val": 1420000000,
              "accn": "0000104169-19-000088",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-12-04"
            },
            {
              "end": "2019-01-31",
              "val": 1420000000,
              "accn": "0000104169-20-000011",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-03-20",
              "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": "2011-01-31",
              "val": 1336000000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2012-01-31",
              "val": 1590000000,
              "accn": "0001193125-12-134679",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-03-27",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2013-01-31",
              "val": 1598000000,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2014-01-31",
              "val": 1632000000,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2015-01-31",
              "val": 1615000000,
              "accn": "0000104169-15-000011",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-04-01",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2016-01-31",
              "val": 1989000000,
              "accn": "0000104169-16-000079",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-03-30",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2017-01-31",
              "val": 1787000000,
              "accn": "0000104169-17-000021",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-03-31",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2018-01-31",
              "val": 1718000000,
              "accn": "0000104169-18-000028",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-03-30",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2019-01-31",
              "val": 1655000000,
              "accn": "0000104169-19-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-03-28"
            },
            {
              "end": "2019-01-31",
              "val": 1655000000,
              "accn": "0000104169-19-000024",
              "fy": 2020,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-06-07"
            },
            {
              "end": "2019-01-31",
              "val": 1655000000,
              "accn": "0000104169-19-000064",
              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-09-06"
            },
            {
              "end": "2019-01-31",
              "val": 1655000000,
              "accn": "0000104169-19-000088",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-12-04"
            },
            {
              "end": "2019-01-31",
              "val": 1655000000,
              "accn": "0000104169-20-000011",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-03-20",
              "frame": "CY2018Q4I"
            }
          ]
        }
      },
      "OperatingLeasesFutureMinimumPaymentsDueThereafter": {
        "label": "Operating Leases, Future Minimum Payments, Due Thereafter",
        "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 after 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": "2011-01-31",
              "val": 7785000000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2012-01-31",
              "val": 8916000000,
              "accn": "0001193125-12-134679",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-03-27",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2013-01-31",
              "val": 9373000000,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2014-01-31",
              "val": 9836000000,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2015-01-31",
              "val": 10464000000,
              "accn": "0000104169-15-000011",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-04-01",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2016-01-31",
              "val": 12438000000,
              "accn": "0000104169-16-000079",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-03-30",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2017-01-31",
              "val": 9537000000,
              "accn": "0000104169-17-000021",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-03-31",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2018-01-31",
              "val": 7644000000,
              "accn": "0000104169-18-000028",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-03-30",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2019-01-31",
              "val": 6891000000,
              "accn": "0000104169-19-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-03-28"
            },
            {
              "end": "2019-01-31",
              "val": 6891000000,
              "accn": "0000104169-19-000024",
              "fy": 2020,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-06-07"
            },
            {
              "end": "2019-01-31",
              "val": 6891000000,
              "accn": "0000104169-19-000064",
              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-09-06"
            },
            {
              "end": "2019-01-31",
              "val": 6891000000,
              "accn": "0000104169-19-000088",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-12-04"
            },
            {
              "end": "2019-01-31",
              "val": 6891000000,
              "accn": "0000104169-20-000011",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-03-20",
              "frame": "CY2018Q4I"
            }
          ]
        }
      },
      "OperatingLeasesRentExpenseContingentRentals": {
        "label": "Operating Leases, Rent Expense, Contingent Rentals",
        "description": "The increases or decreases in lease payments that result from changes occurring after the inception of the lease in the factors (other than the passage of time) on which lease payments are based, except that any escalation of minimum lease payments relating to increases in construction or acquisition cost of the leased property or for increases in some measure of cost or value during the construction or preconstruction period, are excluded from contingent rentals. Contingent rentals also may include amounts for which the triggering events have not yet occurred or the specified targets for which have not yet been achieved (such as sales based percentage rent), but which events are considered probable of occurring or which specified targets are considered probable of being achieved.",
        "units": {
          "USD": [
            {
              "start": "2011-02-01",
              "end": "2012-01-31",
              "val": 109000000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2011"
            },
            {
              "start": "2012-02-01",
              "end": "2013-01-31",
              "val": 92000000,
              "accn": "0001193125-12-134679",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-03-27"
            },
            {
              "start": "2012-02-01",
              "end": "2013-01-31",
              "val": 82000000,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26",
              "frame": "CY2012"
            },
            {
              "start": "2013-02-01",
              "end": "2014-01-31",
              "val": 49000000,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2013"
            },
            {
              "start": "2014-02-01",
              "end": "2015-01-31",
              "val": 58000000,
              "accn": "0000104169-15-000011",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-04-01",
              "frame": "CY2014"
            },
            {
              "start": "2015-02-01",
              "end": "2016-01-31",
              "val": 34000000,
              "accn": "0000104169-16-000079",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-03-30",
              "frame": "CY2015"
            }
          ]
        }
      },
      "OperatingLeaseWeightedAverageDiscountRatePercent": {
        "label": "Operating Lease, Weighted Average Discount Rate, Percent",
        "description": "Weighted average discount rate for operating lease calculated at point in time.",
        "units": {
          "pure": [
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              "end": "2019-04-30",
              "val": 0.053,
              "accn": "0000104169-19-000024",
              "fy": 2020,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-06-07",
              "frame": "CY2019Q1I"
            },
            {
              "end": "2019-07-31",
              "val": 0.053,
              "accn": "0000104169-19-000064",
              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-09-06",
              "frame": "CY2019Q2I"
            },
            {
              "end": "2019-10-31",
              "val": 0.054,
              "accn": "0000104169-19-000088",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-12-04",
              "frame": "CY2019Q3I"
            },
            {
              "end": "2020-01-31",
              "val": 0.054,
              "accn": "0000104169-20-000011",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-03-20"
            },
            {
              "end": "2020-01-31",
              "val": 0.054,
              "accn": "0000104169-21-000033",
              "fy": 2021,
              "fp": "FY",
              "form": "10-K",
              "filed": "2021-03-19",
              "frame": "CY2019Q4I"
            },
            {
              "end": "2021-01-31",
              "val": 0.061,
              "accn": "0000104169-21-000033",
              "fy": 2021,
              "fp": "FY",
              "form": "10-K",
              "filed": "2021-03-19"
            },
            {
              "end": "2021-01-31",
              "val": 0.061,
              "accn": "0000104169-22-000012",
              "fy": 2022,
              "fp": "FY",
              "form": "10-K",
              "filed": "2022-03-18",
              "frame": "CY2020Q4I"
            },
            {
              "end": "2022-01-31",
              "val": 0.059,
              "accn": "0000104169-22-000012",
              "fy": 2022,
              "fp": "FY",
              "form": "10-K",
              "filed": "2022-03-18"
            },
            {
              "end": "2022-01-31",
              "val": 0.059,
              "accn": "0000104169-23-000020",
              "fy": 2023,
              "fp": "FY",
              "form": "10-K",
              "filed": "2023-03-17",
              "frame": "CY2021Q4I"
            },
            {
              "end": "2023-01-31",
              "val": 0.06,
              "accn": "0000104169-23-000020",
              "fy": 2023,
              "fp": "FY",
              "form": "10-K",
              "filed": "2023-03-17"
            },
            {
              "end": "2023-01-31",
              "val": 0.06,
              "accn": "0000104169-24-000056",
              "fy": 2024,
              "fp": "FY",
              "form": "10-K",
              "filed": "2024-03-15",
              "frame": "CY2022Q4I"
            },
            {
              "end": "2024-01-31",
              "val": 0.064,
              "accn": "0000104169-24-000056",
              "fy": 2024,
              "fp": "FY",
              "form": "10-K",
              "filed": "2024-03-15"
            },
            {
              "end": "2024-01-31",
              "val": 0.064,
              "accn": "0000104169-25-000021",
              "fy": 2025,
              "fp": "FY",
              "form": "10-K",
              "filed": "2025-03-14",
              "frame": "CY2023Q4I"
            },
            {
              "end": "2025-01-31",
              "val": 0.065,
              "accn": "0000104169-25-000021",
              "fy": 2025,
              "fp": "FY",
              "form": "10-K",
              "filed": "2025-03-14"
            },
            {
              "end": "2025-01-31",
              "val": 0.065,
              "accn": "0000104169-26-000055",
              "fy": 2026,
              "fp": "FY",
              "form": "10-K",
              "filed": "2026-03-13",
              "frame": "CY2024Q4I"
            },
            {
              "end": "2026-01-31",
              "val": 0.067,
              "accn": "0000104169-26-000055",
              "fy": 2026,
              "fp": "FY",
              "form": "10-K",
              "filed": "2026-03-13",
              "frame": "CY2025Q4I"
            }
          ]
        }
      },
      "OtherAccruedLiabilitiesCurrent": {
        "label": "Other Accrued Liabilities, Current",
        "description": "Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.",
        "units": {
          "USD": [
            {
              "end": "2010-01-31",
              "val": 9524000000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2009Q4I"
            },
            {
              "end": "2011-01-31",
              "val": 9359000000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30"
            },
            {
              "end": "2011-01-31",
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              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-03-27",
              "frame": "CY2009"
            },
            {
              "start": "2009-02-01",
              "end": "2010-01-31",
              "val": 0.187,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30"
            },
            {
              "start": "2010-02-01",
              "end": "2011-01-31",
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              "accn": "0001193125-12-134679",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-03-27"
            },
            {
              "start": "2010-02-01",
              "end": "2011-01-31",
              "val": 0.171,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30"
            },
            {
              "start": "2010-02-01",
              "end": "2011-01-31",
              "val": 0.171,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26",
              "frame": "CY2010"
            },
            {
              "start": "2011-02-01",
              "end": "2012-01-31",
              "val": 0.176,
              "accn": "0001193125-12-134679",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-03-27"
            },
            {
              "start": "2011-02-01",
              "end": "2012-01-31",
              "val": 0.176,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2011"
            },
            {
              "start": "2011-02-01",
              "end": "2012-01-31",
              "val": 0.176,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26"
            },
            {
              "start": "2012-02-01",
              "end": "2013-01-31",
              "val": 0.162,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2012"
            },
            {
              "start": "2012-02-01",
              "end": "2013-01-31",
              "val": 0.162,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26"
            },
            {
              "start": "2013-02-01",
              "end": "2014-01-31",
              "val": 0.152,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2013"
            }
          ]
        }
      },
      "ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate": {
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate",
        "description": "The risk-free interest rate assumption that is used in valuing an option on its own shares.",
        "units": {
          "pure": [
            {
              "start": "2008-02-01",
              "end": "2009-01-31",
              "val": 0.02,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2008"
            },
            {
              "start": "2009-02-01",
              "end": "2010-01-31",
              "val": 0.014,
              "accn": "0001193125-12-134679",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-03-27",
              "frame": "CY2009"
            },
            {
              "start": "2009-02-01",
              "end": "2010-01-31",
              "val": 0.014,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30"
            },
            {
              "start": "2010-02-01",
              "end": "2011-01-31",
              "val": 0.018,
              "accn": "0001193125-12-134679",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-03-27"
            },
            {
              "start": "2010-02-01",
              "end": "2011-01-31",
              "val": 0.018,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30"
            },
            {
              "start": "2010-02-01",
              "end": "2011-01-31",
              "val": 0.018,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26",
              "frame": "CY2010"
            },
            {
              "start": "2011-02-01",
              "end": "2012-01-31",
              "val": 0.013,
              "accn": "0001193125-12-134679",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-03-27"
            },
            {
              "start": "2011-02-01",
              "end": "2012-01-31",
              "val": 0.013,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2011"
            },
            {
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              "end": "2012-01-31",
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              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26"
            },
            {
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              "end": "2013-01-31",
              "val": 0.006,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2012"
            },
            {
              "start": "2012-02-01",
              "end": "2013-01-31",
              "val": 0.006,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26"
            },
            {
              "start": "2013-02-01",
              "end": "2014-01-31",
              "val": 0.004,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2013"
            }
          ]
        }
      },
      "ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized": {
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized",
        "description": "Number of shares authorized for issuance under share-based payment arrangement.",
        "units": {
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              "end": "2010-06-04",
              "val": 210000000,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26"
            },
            {
              "end": "2010-06-04",
              "val": 210000000,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21"
            },
            {
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              "val": 210000000,
              "accn": "0000104169-15-000011",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-04-01",
              "frame": "CY2010Q2I"
            },
            {
              "end": "2011-01-31",
              "val": 49000000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2012-01-31",
              "val": 210000000,
              "accn": "0001193125-12-134679",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-03-27",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2013-01-31",
              "val": 49000000,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
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              "filed": "2013-03-26",
              "frame": "CY2012Q4I"
            },
            {
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              "val": 49000000,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2015-06-05",
              "val": 210000000,
              "accn": "0000104169-16-000079",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-03-30"
            },
            {
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              "val": 210000000,
              "accn": "0000104169-17-000021",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-03-31"
            },
            {
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              "fp": "FY",
              "form": "10-K",
              "filed": "2018-03-30",
              "frame": "CY2015Q2I"
            },
            {
              "end": "2018-02-01",
              "val": 260000000,
              "accn": "0000104169-19-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-03-28"
            },
            {
              "end": "2018-02-01",
              "val": 260000000,
              "accn": "0000104169-20-000011",
              "fy": 2020,
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              "form": "10-K",
              "filed": "2020-03-20"
            },
            {
              "end": "2018-02-01",
              "val": 260000000,
              "accn": "0000104169-21-000033",
              "fy": 2021,
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              "form": "10-K",
              "filed": "2021-03-19"
            },
            {
              "end": "2018-02-01",
              "val": 260000000,
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              "fp": "FY",
              "form": "10-K",
              "filed": "2022-03-18"
            },
            {
              "end": "2018-02-01",
              "val": 260000000,
              "accn": "0000104169-23-000020",
              "fy": 2023,
              "fp": "FY",
              "form": "10-K",
              "filed": "2023-03-17"
            },
            {
              "end": "2018-02-01",
              "val": 780000000,
              "accn": "0000104169-24-000056",
              "fy": 2024,
              "fp": "FY",
              "form": "10-K",
              "filed": "2024-03-15"
            },
            {
              "end": "2018-02-01",
              "val": 780000000,
              "accn": "0000104169-25-000021",
              "fy": 2025,
              "fp": "FY",
              "form": "10-K",
              "filed": "2025-03-14",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2026-01-31",
              "val": 215000000,
              "accn": "0000104169-26-000055",
              "fy": 2026,
              "fp": "FY",
              "form": "10-K",
              "filed": "2026-03-13",
              "frame": "CY2025Q4I"
            }
          ]
        }
      },
      "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableIntrinsicValue": {
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value (Deprecated 2011-01-31)",
        "description": "The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date.",
        "units": {
          "USD": [
            {
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              "end": "2011-01-31",
              "val": 117319000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2010"
            }
          ]
        }
      },
      "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber": {
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number",
        "description": "The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.",
        "units": {
          "shares": [
            {
              "end": "2011-01-31",
              "val": 23793000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2013-01-31",
              "val": 5326,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2014-01-31",
              "val": 3119000,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2013Q4I"
            }
          ]
        }
      },
      "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice": {
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price",
        "description": "The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.",
        "units": {
          "USD/shares": [
            {
              "end": "2011-01-31",
              "val": 51.31,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2013-01-31",
              "val": 50,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2014-01-31",
              "val": 48.45,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2013Q4I"
            }
          ]
        }
      },
      "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm": {
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Deprecated 2012-01-31)",
        "description": "The weighted average period between the balance sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.",
        "units": {
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            {
              "start": "2010-02-01",
              "end": "2011-01-31",
              "val": 3.2,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2010"
            }
          ],
          "years": [
            {
              "start": "2011-02-01",
              "end": "2012-01-31",
              "val": 2.9,
              "accn": "0001193125-12-134679",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-03-27",
              "frame": "CY2011"
            }
          ]
        }
      },
      "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriod": {
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (Deprecated 2011-01-31)",
        "description": "The decrease in the number of reserved shares that could potentially be issued attributable to the exercise or conversion during the reporting period of previously issued stock options under the option plan.",
        "units": {
          "shares": [
            {
              "start": "2010-02-01",
              "end": "2011-01-31",
              "val": -7868000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2010"
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          ]
        }
      },
      "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue": {
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value",
        "description": "Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.",
        "units": {
          "USD": [
            {
              "start": "2008-02-01",
              "end": "2009-01-31",
              "val": 173000000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2008"
            },
            {
              "start": "2009-02-01",
              "end": "2010-01-31",
              "val": 39000000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2009"
            },
            {
              "start": "2010-02-01",
              "end": "2011-01-31",
              "val": 51000000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30"
            },
            {
              "start": "2010-02-01",
              "end": "2011-01-31",
              "val": 51000000,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26",
              "frame": "CY2010"
            },
            {
              "start": "2011-02-01",
              "end": "2012-01-31",
              "val": 91000000,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2011"
            },
            {
              "start": "2011-02-01",
              "end": "2012-01-31",
              "val": 91000000,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26"
            },
            {
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              "end": "2013-01-31",
              "val": 207000000,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2012"
            },
            {
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              "end": "2013-01-31",
              "val": 207000000,
              "accn": "0000104169-13-000011",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-26"
            },
            {
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              "end": "2014-01-31",
              "val": 99000000,
              "accn": "0000104169-14-000019",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-21",
              "frame": "CY2013"
            }
          ]
        }
      },
      "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice": {
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (Deprecated 2012-01-31)",
        "description": "The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.",
        "units": {
          "USD": [
            {
              "end": "2011-01-31",
              "val": 47.66,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2010Q4I"
            }
          ]
        }
      },
      "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod": {
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period",
        "description": "For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.",
        "units": {
          "shares": [
            {
              "start": "2010-02-01",
              "end": "2011-01-31",
              "val": -2626000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2010"
            }
          ]
        }
      },
      "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice": {
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price",
        "description": "Weighted average price of options that were either forfeited or expired.",
        "units": {
          "USD/shares": [
            {
              "start": "2010-02-01",
              "end": "2011-01-31",
              "val": 49.85,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2010"
            }
          ]
        }
      },
      "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod": {
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures",
        "description": "Net number of share options (or share units) granted during the period.",
        "units": {
          "shares": [
            {
              "start": "2010-02-01",
              "end": "2011-01-31",
              "val": 1921000,
              "accn": "0001193125-11-083157",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-30",
              "frame": "CY2010"
            }
          ]
        }
      },
      "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice": {
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        "label": "Termination Loans",
        "description": "Definite liabilities to third parties under a termination loan agreement, whether or not guaranteed in whole or in part by the government.",
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      },
      "TradingSecuritiesDebt": {
        "label": "Debt Securities, Trading",
        "description": "Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading).",
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