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FRESH START ACCOUNTING - Schedule of Net Change in Cash (Details) - USD ($) $ in Millions		2 Months Ended	10 Months Ended	12 Months Ended
	Oct. 31, 2020	Dec. 31, 2020	Oct. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fresh-Start Adjustment [Line Items]
Proceeds from Revolving Credit Facility	$ 225
Proceeds from Subscription Rights and Backstop Commitment, net	446
Proceeds from Second Lien Term Loan	200
Repayments of debtor-in-possession facilities	(733)	$ 0	$ (802)	$ 0	$ 0
Payment of legal, professional and other fees	(15)	(3)	(43)
Debtor-in-possession financing costs		$ 0	$ (25)
Acquisition of noncontrolling interest as part of the Settlement Agreement	(2)
Distribution to noncontrolling interest holder	(3)
Payment of accrued interest and bank fees	(1)
Net change	97
Second Lien Term Loan
Fresh-Start Adjustment [Line Items]
Debtor-in-possession financing costs	(2)
Revolving Credit Facility
Fresh-Start Adjustment [Line Items]
Debtor-in-possession financing costs	$ (18)

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