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Long-term Debt and Borrowing Facilities (Issuance And Repurchase Of Notes) (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 03, 2019 | Jul. 06, 2019 | Oct. 31, 2020 | Aug. 01, 2020 | Oct. 31, 2020 | Nov. 02, 2019 | Feb. 01, 2020
Debt Instrument, Face Amount |  |  | $ 6,449,000,000 |  | $ 6,449,000,000 | $ 5,458,000,000 | $ 5,458,000,000
Proceeds from Issuance of Long-Term Debt, Net of Issuance Costs |  |  |  |  | 2,219,000,000 | 486,000,000 |
Extinguishment of debt |  |  |  |  | 1,259,000,000 |  |
Debt Instrument, Repurchase Amount |  | $ 669,000,000 | 844,000,000 |  | 1,307,000,000 | 799,000,000 |
Loss on Extinguishment of Debt |  |  |  |  | 53,000,000 | 40,000,000 |
Extinguishment of Debt, Gain (Loss), Net of Tax |  |  |  |  | 40,000,000 | $ 30,000,000 |
Fixed Rate 6.625 Percent Notes Due April 2021 [Member] |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  | 463,000,000 |  |  |  |
Fixed Rate 7.00% Notes Due May 2020 [Member] |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount | $ 130,000,000 |  |  |  |  |  |
With Subsidiary Guarantee [Member] | 6.875% Fixed Interest Rate Secured Notes due July 2025 [Member] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 750,000,000 |  |  |
Debt instrument, stated rate |  |  |  | 6.875% |  |  |
Proceeds from Issuance of Debt |  |  |  | $ 739,000,000 |  |  |
Payments of Debt Issuance Costs |  |  |  | 11,000,000 |  |  |
With Subsidiary Guarantee [Member] | 9.375% Fixed Interest Rate Notes due July 2025 [Member] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 500,000,000 |  |  |
Debt instrument, stated rate |  |  |  | 9.375% |  |  |
Proceeds from Issuance of Debt |  |  |  | $ 492,000,000 |  |  |
Payments of Debt Issuance Costs |  |  |  | $ 8,000,000 |  |  |
With Subsidiary Guarantee [Member] | Fixed Rate 5.625 Percent Notes Due February 2022 [Member] |  |  |  |  |  |  |
Extinguishment of debt |  | 96,000,000 | 576,000,000 |  |  |  |
With Subsidiary Guarantee [Member] | Fixed Rate 6.625 Percent Notes Due April 2021 [Member] |  |  |  |  |  |  |
Extinguishment of debt |  | 330,000,000 | 450,000,000 |  |  |  |
With Subsidiary Guarantee [Member] | Fixed Rate 7.00% Notes Due May 2020 [Member] |  |  |  |  |  |  |
Extinguishment of debt | $ 126,000,000 | $ 212,000,000 |  |  |  |  |
With Subsidiary Guarantee [Member] | Fixed Rate 6.625% Notes Due October 2030 [Member] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 1,000,000,000 |  | $ 1,000,000,000 |  |
Debt instrument, stated rate |  |  | 6.625% |  | 6.625% |  |
Proceeds from Issuance of Debt |  |  | $ 988,000,000 |  |  |  |
Payments of Debt Issuance Costs |  |  | 12,000,000 |  | $ 12,000,000 |  |
With Subsidiary Guarantee [Member] | Fixed Rate 5.625% Notes Due October 2023 [Member] |  |  |  |  |  |  |
Extinguishment of debt |  |  | 180,000,000 |  |  |  |
Without Subsidiary Guarantee [Member] | Fixed Rate 7.60% Notes Due July 2037 [Member] |  |  |  |  |  |  |
Extinguishment of debt |  |  | $ 53,000,000 |  |  |  |

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