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Fresh Start Accounting - Reorganization Items, Net (Details) - USD ($) $ in Millions			1 Months Ended	11 Months Ended	12 Months Ended
	Feb. 09, 2021	Dec. 15, 2020	Feb. 09, 2021	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2020
Reorganization, Chapter 11 [Line Items]
Loss on divested assets		$ (128)
Total reorganization items, net			$ 5,569	$ 0	$ 0	$ (796)
Reorganization Adjustments
Reorganization, Chapter 11 [Line Items]
Gain on settlement of liabilities subject to compromise	$ 6,443		6,443			12
Accrual for allowed claims			(1,002)			(879)
Write off of unamortized debt premiums (discounts)			0			518
Write off of unamortized debt issuance costs			0			(61)
Gain on fresh start adjustments			201			0
Gain from release of commitment liabilities			55			0
Debt and equity financing fees			0			(145)
Loss on divested assets			0			(128)
Legal and professional fees			(60)			(113)
Success fees for professional service providers			(38)			0
Surrender of other receivable	18		(18)			0
FLLO alternative transaction fee			(12)			0
Total reorganization items, net	$ (6,370)		$ 5,569			$ (796)

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