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NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	2 Months Ended	10 Months Ended	12 Months Ended
	Dec. 31, 2020	Oct. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Supplemental Cash Flow Information
Cash paid for interest, net of amounts capitalized	$ (8)	$ (79)	$ (425)	$ (433)
Supplementary Disclosure of Noncash Investing and Financing Activities
Successor common stock, Subscription Rights and Warrants issued pursuant to the Plan		(494)
Successor common stock issued for the junior debtor-in-possession exit fee pursuant to the Plan		(12)
Successor common stock and EHP Notes issued for acquisition of noncontrolling interest pursuant to the Plan		(561)
Successor common stock issued for a backstop commitment premium pursuant to the Plan		$ (52)
Warrant issued to a joint venture partner			$ (3)
Common stock issued as part of the acquisition of Elk Hills unit				$ (51)