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Fresh Start Accounting - Estimated Fair Value of Debt at Emergence (Details) - USD ($) $ in Millions |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 02, 2018 | Dec. 31, 2018 | Jul. 01, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Fresh-Start Adjustment [Line Items] |  |  |  |  |
Carrying value after reorganization adjustments |  |  |  | $ 6,177 | $ 6,623
Fair value adjustment to record discount on the senior secured credit facilities and Ship Finance Loans |  | $ (24) | $ 0 | $ (44) | $ (47)
Debt, fair value | $ 7,301 |  |  |  |
Secured Debt | Senior secured notes |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |
Carrying value after reorganization adjustments | 866 |  |  |  |
Write-off of unamortized debt issuance costs | 9 |  |  |  |
Write-off of discounts for pre-issuance accrued interest settled upon issuance of senior secured notes (4% cash interest of $5 million and 8% paid-in kind interest of $10 million) | 15 |  |  |  |
Debt, fair value | $ 890 |  |  |  |
Stated interest rate, cash portion (as a percent) | 4.00% |  | 4.00% |  |
$5 million applicable to 4% cash interest |  |  | $ 5 |  |
Stated interest rate, paid-in-kind portion (as a percent) | 8.00% |  | 8.00% |  |
$10 million applicable to 8% paid-in-kind interest |  |  | $ 10 |  |
Secured Debt | Credit facilities contained within variable interest entities |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |
Carrying value after reorganization adjustments | $ 736 |  |  |  |
Write-off of unamortized debt issuance costs | 1 |  |  |  |
Fair value adjustment to record discount on the senior secured credit facilities and Ship Finance Loans | (33) |  |  |  |
Debt, fair value | 704 |  |  |  |
Floating rate debt obligations | Senior Credit Facilities |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |
Carrying value after reorganization adjustments | 5,636 |  |  |  |
Write-off of unamortized debt issuance costs | 26 |  |  |  |
Fair value adjustment to record discount on the senior secured credit facilities and Ship Finance Loans | (155) |  |  |  |
Debt, fair value | 5,507 |  |  |  |
Total |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |
Carrying value after reorganization adjustments | 7,238 |  |  |  |
Write-off of unamortized debt issuance costs | 36 |  |  |  |
Write-off of discounts for pre-issuance accrued interest settled upon issuance of senior secured notes (4% cash interest of $5 million and 8% paid-in kind interest of $10 million) | 15 |  |  |  |
Fair value adjustment to record discount on the senior secured credit facilities and Ship Finance Loans | (188) |  |  |  |
Debt, fair value | $ 7,101 |  |  |  |

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