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, 2022	Dec. 31, 2021
Supplemental Cash Flow Information
Interest paid, net of amount capitalized	$ (8)	$ (79)	$ (43)	$ (28)
Income tax paid	0	0	20	0
Supplemental Disclosure of Noncash Investing and Financing Activities
Successor common stock, Subscription Rights and Warrants issued pursuant to the Plan	0	(494)	0	0
Successor common stock issued for the junior debtor-in-possession exit fee pursuant to the Plan	0	(12)	0	0
Successor common stock and EHP Notes issued for acquisition of noncontrolling interest pursuant to the Plan	0	(561)	0	0
Successor common stock issued for a backstop commitment premium pursuant to the Plan	0	(52)	0	0
Derivative related to additional earn-out consideration for the Ventura divestiture	0	0	0	3
Receivable from affiliate	0	0	32	0
Dividends accrued for stock-based compensation awards	0	0	2	0
Contribution to the Carbon TerraVault JV	$ 0	$ 0	$ 2	$ 0