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Financing Activities (Narrative) (Details) - USD ($) |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Aug. 17, 2021 | Mar. 17, 2021 | Oct. 30, 2021 | Jul. 31, 2021 | May 01, 2021 | Aug. 01, 2020 | Jul. 31, 2021 | Aug. 01, 2020
Gains (losses) on retirement of debt |  |  |  | $ (3,000,000) | $ (11,000,000) | $ 0 | $ (14,000,000) | $ 0
Extinguishment of debt |  | $ 500,000,000 |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  | $ 17,000,000 |  |  |  |  |  |
Secured Debt, Current [Member] |  |  |  |  |  |  |  |
Face amount |  |  |  | $ 1,300,000,000 |  |  | $ 1,300,000,000 |
5.875% Senior Notes due 2029 [Member] |  |  |  |  |  |  |  |
Debt instrument interest rate, stated percentage |  | 5.875% |  |  |  |  |  |
Face amount |  | $ 500,000,000 |  |  |  |  |  |
Debt instrument, maturity date |  | Apr. 01, 2029 |  |  |  |  |  |
Forecast [Member] |  |  |  |  |  |  |  |
Gains (losses) on retirement of debt |  |  | $ 185,000,000 |  |  |  |  |
Subsequent Event [Member] | 8.375% Senior secured notes due 2025 [Member] |  |  |  |  |  |  |  |
Debt instrument, redeemed in principal amount | $ 1,300,000,000 |  |  |  |  |  |  |
Debt instrument interest rate, stated percentage | 8.375% |  |  |  |  |  |  |
Debt instrument, redemption price, percentage of principal amount redeemed | 100.00% |  |  |  |  |  |  |
Debt instrument, accrued and unpaid interest | $ 19,000,000 |  |  |  |  |  |  |
Gain (loss) on early redemption of debt before write off | 138,000,000 |  |  |  |  |  |  |
Unamortized deferred debt costs | $ 47,000,000 |  |  |  |  |  |  |

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