Fresh Start Accounting - Change in Successor Additional Paid-in Capital (Details) - USD ($) $ in Millions	Feb. 09, 2021	Mar. 31, 2022	Dec. 31, 2021
Class of Stock [Line Items]
Issuance of Successor equity associated with the Rights Offering and Backstop Commitment	$ 2,371
Issuance of Successor equity to holders of the FLLO Term Loan, incremental to the Rights Offering and Backstop Commitment	783
Issuance of Successor common stock to Second Lien Note holders, incremental to the Rights Offering and Backstop Commitment	124
Issuance of Successor common stock to unsecured note holders	45
Issuance of Successor common stock to general unsecured claims	8
Total change in Successor common stock and additional paid-in capital	3,586
Less: par value of Successor common stock	(1)	$ (1)	$ (1)
Change in Successor additional paid-in capital	3,585
Class A Warrants
Class of Stock [Line Items]
Warrants	93
Class B Warrants
Class of Stock [Line Items]
Warrants	94
Class C Warrants
Class of Stock [Line Items]
Warrants	$ 68