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Financing Activities - Narrative (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 08, 2020 | Aug. 01, 2020 | Aug. 01, 2020 | Aug. 03, 2019 | Jun. 30, 2020
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 1,500,000,000 | $ 1,500,000,000 |  |
Proceeds from Issuance of Debt |  |  | $ 2,780,000,000 | $ 0 |
New 2024 Notes |  |  |  |  |
Interest rate stated percentage |  | 6.65% | 6.65% |  |
Long-term Debt, Gross |  | $ 81,000,000 | $ 81,000,000 |  |
Old 2024 Notes |  |  |  |  |
Interest rate stated percentage |  |  |  |  | 6.65%
New 2028 Notes |  |  |  |  |
Interest rate stated percentage |  | 6.70% | 6.70% |  |
Long-term Debt, Gross |  | $ 74,000,000 | $ 74,000,000 |  |
Old 2028 Notes |  |  |  |  |
Interest rate stated percentage |  |  |  |  | 6.70%
New 2029 Notes |  |  |  |  |
Interest rate stated percentage |  | 8.75% | 8.75% |  |
Long-term Debt, Gross |  | $ 13,000,000 | $ 13,000,000 |  |
Old 2029 Notes |  |  |  |  |
Interest rate stated percentage |  |  |  |  | 8.75%
New 2030 Notes |  |  |  |  |
Interest rate stated percentage |  | 7.875% | 7.875% |  |
Long-term Debt, Gross |  | $ 5,000,000 | $ 5,000,000 |  |
Old 2030 Notes |  |  |  |  |
Interest rate stated percentage |  |  |  |  | 7.875%
New 2032 Notes |  |  |  |  |
Interest rate stated percentage |  | 6.90% | 6.90% |  |
Long-term Debt, Gross |  | $ 5,000,000 | $ 5,000,000 |  |
Old 2032 Notes |  |  |  |  |
Interest rate stated percentage |  |  |  |  | 6.90%
New 2034 Notes |  |  |  |  |
Interest rate stated percentage |  | 6.70% | 6.70% |  |
Long-term Debt, Gross |  | $ 183,000,000 | $ 183,000,000 |  |
Old 2034 Notes |  |  |  |  |
Interest rate stated percentage |  |  |  |  | 6.70%
Revolving Credit Facility [Member] |  |  |  |  |
Proceeds from Lines of Credit |  |  | 1,500,000,000 |  |
Revolving Credit Facility [Member] | April 30, 2021 or After |  |  |  |  |
Percent of loan cap | 10.00% |  |  |  |
Availability plus suppressed availability | $ 250,000,000 |  |  |  |
Revolving Credit Facility [Member] | Prior to April 30, 2021 |  |  |  |  |
Percent of loan cap | 10.00% |  |  |  |
Availability plus suppressed availability | $ 250,000,000 |  |  |  |
ABL Borrower | Revolving Credit Facility [Member] |  |  |  |  |
Additional borrowing capacity available | $ 750,000,000 |  |  |  |
Liquidation percentage | 80.00% |  |  |  |
Liquidation percentage, upon satisfaction of certain conditions | 90.00% |  |  |  |
ABL Borrower | Revolving Credit Facility [Member] | Revolving ABL Facility |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 2,926,000,000 | 2,926,000,000 |  |
ABL Borrower | Revolving Credit Facility [Member] | Bridge Facility |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 300,000,000 |  |  |  |
Senior Notes |  |  |  |  |
Face amount | $ 1,300,000,000 |  |  |  |
Interest rate stated percentage | 8.375% |  |  |  |
Old 2024 Notes |  |  |  |  |
Long-term Debt, Gross |  | 41,000,000 | 41,000,000 |  |
Debt subject to consent offer |  | 85,000,000 |  |  |
Old 2028 Notes |  |  |  |  |
Long-term Debt, Gross |  | 29,000,000 | 29,000,000 |  |
Debt subject to consent offer |  | 77,000,000 |  |  |
Old 2029 Notes |  |  |  |  |
Debt subject to consent offer |  | 13,000,000 |  |  |
Old 2030 Notes |  |  |  |  |
Long-term Debt, Gross |  | 5,000,000 | 5,000,000 |  |
Debt subject to consent offer |  | 5,000,000 |  |  |
Old 2032 Notes |  |  |  |  |
Long-term Debt, Gross |  | 12,000,000 | 12,000,000 |  |
Debt subject to consent offer |  | 6,000,000 |  |  |
Old 2034 Notes |  |  |  |  |
Long-term Debt, Gross |  | 18,000,000 | $ 18,000,000 |  |
Debt subject to consent offer |  | $ 185,000,000 |  |  |
Minimum |  |  |  |  |
Current borrowing capacity | $ 25,000,000 |  |  |  |
Minimum | ABL Borrower |  |  |  |  |
Coverage ratio | 1.00 |  |  |  |
Minimum | ABL Borrower | Revolving Credit Facility [Member] | Prior to Step Down Date | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Basis spread on variable rate | 2.75% |  |  |  |
Minimum | ABL Borrower | Revolving Credit Facility [Member] | Prior to Step Down Date | Base Rate |  |  |  |  |
Basis spread on variable rate | 1.75% |  |  |  |
Minimum | ABL Borrower | Revolving Credit Facility [Member] | After Step Down Date | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Basis spread on variable rate | 2.25% |  |  |  |
Minimum | ABL Borrower | Revolving Credit Facility [Member] | After Step Down Date | Base Rate |  |  |  |  |
Basis spread on variable rate | 1.25% |  |  |  |
Maximum | ABL Borrower |  |  |  |  |
Coverage ratio | 1.00 |  |  |  |
Maximum | ABL Borrower | Revolving Credit Facility [Member] | Prior to Step Down Date | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Basis spread on variable rate | 3.00% |  |  |  |
Maximum | ABL Borrower | Revolving Credit Facility [Member] | Prior to Step Down Date | Base Rate |  |  |  |  |
Basis spread on variable rate | 2.00% |  |  |  |
Maximum | ABL Borrower | Revolving Credit Facility [Member] | After Step Down Date | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Basis spread on variable rate | 2.50% |  |  |  |
Maximum | ABL Borrower | Revolving Credit Facility [Member] | After Step Down Date | Base Rate |  |  |  |  |
Basis spread on variable rate | 1.50% |  |  |  |

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