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v3.20.4

Subsequent Events (Details) |  | 2 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 03, 2021 USD ($) employee | Mar. 01, 2021 USD ($) employee | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Feb. 09, 2021 USD ($) | Feb. 02, 2021 USD ($) | Jun. 28, 2020 USD ($)
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Debt, principal |  |  | $ 9,095,000,000 | $ 8,916,000,000 |  |  |  |
Separation and other termination costs |  |  | $ 44,000,000 | $ 12,000,000 | $ 38,000,000 |  |  |
Credit facility | Exit credit facility |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Revolving credit, maximum borrowing capacity |  |  |  |  |  |  |  | $ 2,500,000,000
Credit facility | Tranche B Loans |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Revolving credit, maximum borrowing capacity |  |  |  |  |  |  |  | $ 220,000,000
Subsequent event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Number of employees terminated | employee | 220 | 220 |  |  |  |  |  |
Number of employees terminated, percent | 15.00% | 15.00% |  |  |  |  |  |
Separation and other termination costs | $ 20,000,000 | $ 20,000,000 |  |  |  |  |  |
Subsequent event | Minimum |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Fresh-start adjustment, increase (decrease), assets |  |  |  |  |  | $ 3,500,000,000 |  |
Fresh-start adjustment, increase (decrease), liabilities and stockholders' equity |  |  |  |  |  | 3,500,000,000 |  |
Subsequent event | Maximum |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Fresh-start adjustment, increase (decrease), assets |  |  |  |  |  | 4,700,000,000 |  |
Fresh-start adjustment, increase (decrease), liabilities and stockholders' equity |  |  |  |  |  | $ 4,700,000,000 |  |
Subsequent event | Senior notes | 5.5% Senior Notes due 2026 |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Debt, principal |  |  |  |  |  |  | $ 500,000,000 |
Subsequent event | Senior notes | 5.875% Senior Notes due 2029 |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Debt, principal |  |  |  |  |  |  | 500,000,000 |
Subsequent event | Credit facility | Exit credit facility |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Revolving credit, maximum borrowing capacity |  |  |  |  |  |  | 2,500,000,000 |
Subsequent event | Credit facility | Revolving Tranche A |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Revolving credit, maximum borrowing capacity |  |  |  |  |  |  | 1,750,000,000 |
Subsequent event | Credit facility | Tranche B Loans |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Revolving credit, maximum borrowing capacity |  |  |  |  |  |  | $ 220,000,000 |

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