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NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER - Accrued Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Oct. 31, 2020
Dec. 31, 2019
Accrued liabilities current [abstract]      
Accrued employee-related costs $ 72   $ 116
Accrued taxes other than on income 36   57
Asset retirement obligations 50 $ 50 28
Accrued interest 1   13
Lease liability 7   28
Fair value of derivatives 50   0
Payments due to counterparties on commodity contracts 21   5
Other 24   66
Accrued liabilities 261   $ 313
Accrued payroll tax $ 5