Fresh Start Accounting - Cumulative Net Impact on Accumulated Deficit (Details) - USD ($) $ in Millions		1 Months Ended	2 Months Ended	3 Months Ended
	Feb. 09, 2021	Feb. 09, 2021	Mar. 31, 2021	Mar. 31, 2022	Dec. 31, 2021
Reorganization, Chapter 11 [Line Items]
Total reorganization items, net		$ (5,569)	$ 0	$ 0
Net impact on accumulated deficit	$ 0	0		(233)	$ 825
Reorganization Adjustments
Reorganization, Chapter 11 [Line Items]
Gain on settlement of liabilities subject to compromise	6,443
Accrual of professional service provider success fees	(38)	(38)
Accrual of professional service provider fees	(5)	(5)
Surrender of other receivable	(18)	(18)	0	0
Payment of FLLO alternative transaction fee	(12)
Total reorganization items, net	6,370	(5,569)	$ 0	$ 0
Cancellation of predecessor equity	18,571	18,571
Net impact on accumulated deficit	$ 24,941	$ 24,941