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Fresh Start Accounting - Cumulative Net Impact on Accumulated Deficit (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	Dec. 31, 2020
Reorganization, Chapter 11 [Line Items]
Total reorganization items, net		$ (5,569)	$ 0	$ 611	$ 0	$ 217
Net impact on accumulated deficit	$ 0	0	$ (557)		(557)		$ (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
Payment of FLLO alternative transaction fee	(12)
Total reorganization items, net	6,370	(5,569)			$ 0	$ 217
Cancellation of predecessor equity	18,571	18,571
Net impact on accumulated deficit	$ 24,941	$ 24,941

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