Fresh Start Accounting - Cumulative Net Impact on Accumulated Deficit (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
Reorganization, Chapter 11 [Line Items]
Reorganization items, net		$ (5,569)	$ 0	$ 796	$ 0
Net impact on accumulated deficit	$ 0	0	825	(23,954)
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	0
Payment of FLLO alternative transaction fee	(12)
Reorganization items, net	6,370	(5,569)	$ 0	$ 796	$ 0
Cancellation of predecessor equity	18,571	18,571
Net impact on accumulated deficit	$ 24,941	$ 24,941