Fresh Start Accounting - Reorganization Items, Net (Details) - USD ($) $ in Millions		1 Months Ended	11 Months Ended	12 Months Ended
	Feb. 09, 2021	Feb. 09, 2021	Dec. 31, 2021	Dec. 31, 2023	Dec. 31, 2022
Reorganization, Chapter 11 [Line Items]
Gain on settlement of liabilities subject to compromise		$ 6,443
Accrual for allowed claims		(1,002)
Gain on fresh start adjustments		201
Gain from release of commitment liabilities		55
Professional service provider fees and other		(60)
Success fees for professional service providers		(38)
Surrender of other receivable		(18)
FLLO alternative transaction fee		(12)
Total reorganization items, net		$ 5,569	$ 0	$ 0	$ 0
Reorganization Adjustments
Reorganization, Chapter 11 [Line Items]
Gain on settlement of liabilities subject to compromise	$ 6,443
Surrender of other receivable	18
Total reorganization items, net	$ (6,370)