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Debt - Post-emergence Debt (Details) - USD ($) $ in Millions | Feb. 09, 2021 | Feb. 02, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Outstanding borrowings |  |  | $ 9,095 | $ 9,458
Subsequent event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding borrowings | $ 1,271 |  |  |
Subsequent event | Senior notes | 5.5% Senior Notes due 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.50% | 5.50% |  |
Outstanding borrowings | $ 500 |  |  |
Subsequent event | Senior notes | 5.875% Senior Notes due 2029 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.875% | 5.875% |  |
Outstanding borrowings | $ 500 |  |  |
Subsequent event | Credit facility | Exit credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding borrowings | 221 |  |  |
Subsequent event | Credit facility | Exit credit facility | Revolving credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding borrowings | $ 50 |  |  |

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