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NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER - Asset Retirement Obligations (Details) - USD ($)
$ in Millions
2 Months Ended 10 Months Ended 12 Months Ended
Dec. 31, 2020
Oct. 31, 2020
Dec. 31, 2019
Asset Retirement Obligations Roll forward      
Beginning balance $ 593 $ 517 $ 433
Liabilities incurred, capitalized to PP&E 0 0 (5)
Liabilities settled and paid (5) (12) (26)
Accretion expense 8 33 36
Dispositions, reduction to PP&E 0 (4) (10)
Other 1 2 4
Revisions in estimated cash flows 0 0 85
Impact of fresh start accounting 0 57 0
Ending balance 597 593 517
Current portion 50 50 28
Non-current portion $ 547 $ 543 $ 489