Fresh Start Accounting - Sources and Uses of Cash (Details) - USD ($) $ in Millions		1 Months Ended	11 Months Ended	12 Months Ended
	Feb. 09, 2021	Feb. 09, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Sources:
Proceeds from issuance of the Notes		$ 1,000	$ 0	$ 0	$ 108
Uses:
Payments on pre-petition revolving credit facility borrowings		$ 0	$ 0	$ (3,317)	$ (10,180)
Reorganization Adjustments
Sources:
Proceeds from issuance of the Notes	$ 1,000
Proceeds from Rights Offering	600
Proceeds from refunds of interest deposit for the Notes	5
Total sources of cash	1,605
Uses:
Payment of roll-up of DIP Facility balance	(1,179)
Payments on pre-petition revolving credit facility borrowings	(479)
Transfers to restricted cash for professional fee reserve	(76)
Transfers to restricted cash for convenience claim distribution reserve	(10)
Payment of professional fees	(31)
Payment of DIP Facility interest and fees	(12)
Payment of FLLO alternative transaction fee	(12)
Payment of the Notes fees funded out of escrow	(8)
Payment of RBL interest and fees	(1)
Total uses of cash	(1,808)
Net cash used	$ (203)