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FRESH START ACCOUNTING - Schedule of Net Change in Cash (Details) - USD ($) $ in Millions |  | 2 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2020 | Dec. 31, 2020 | Oct. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fresh-Start Adjustment [Line Items] |  |  |  |  |
Proceeds from Revolving Credit Facility | $ 225 |  |  |  |
Proceeds from Subscription Rights and Backstop Commitment, net | 446 |  |  |  |
Proceeds from Second Lien Term Loan | 200 |  |  |  |
Repayments of debtor-in-possession facilities | (733) | $ 0 | $ (802) | $ 0 | $ 0
Payment of legal, professional and other fees | (15) | (3) | (43) |  |
Debtor-in-possession financing costs |  | $ 0 | $ (25) |  |
Acquisition of noncontrolling interest as part of the Settlement Agreement | (2) |  |  |  |
Distribution to noncontrolling interest holder | (3) |  |  |  |
Payment of accrued interest and bank fees | (1) |  |  |  |
Net change | 97 |  |  |  |
Second Lien Term Loan |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |
Debtor-in-possession financing costs | (2) |  |  |  |
Revolving Credit Facility |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |
Debtor-in-possession financing costs | $ (18) |  |  |  |

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