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NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER - Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Oct. 31, 2020
Dec. 31, 2019
NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER      
Asset retirement obligations $ 547 $ 543 $ 489
Deferred compensation and postretirement 184   182
Lease liability 35   38
Fair value of derivatives 6   0
Payments due to counterparties on commodity contracts 31   0
Other 19   11
Other Liabilities, Noncurrent, Total $ 822   $ 720