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Fresh Start Accounting - Reorganization Items, Net (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended		8 Months Ended	9 Months Ended
	Feb. 09, 2021	Feb. 09, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Reorganization, Chapter 11 [Line Items]
Gains on the settlement of liabilities subject to compromise			$ 0	$ 9
Accrual for allowed claims			0	(465)
Write off of unamortized debt premiums (discounts) on Predecessor debt		$ 0			$ 0	$ 518
Write off of unamortized debt issuance costs on Predecessor debt		0			0	(61)
Debt and equity financing fees		0	0	(115)	0	(178)
Professional service provider fees and other			0	(40)
Total reorganization items, net		5,569	$ 0	$ (611)	0	(217)
Reorganization Adjustments
Reorganization, Chapter 11 [Line Items]
Gains on the settlement of liabilities subject to compromise		6,443			0	9
Accrual for allowed claims		(1,002)			0	(465)
Gain on fresh start adjustments		201			0	0
Gain from release of commitment liabilities		55			0	0
Professional service provider fees and other		(60)			0	(40)
Success fees for professional service providers		(38)			0	0
Surrender of other receivable	$ (18)	(18)			0	0
FLLO alternative transaction fee		(12)			0	0
Total reorganization items, net	$ (6,370)	$ 5,569			$ 0	$ (217)

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