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Fresh Start Accounting - Fresh Start Adjustments (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		8 Months Ended	9 Months Ended
	Feb. 09, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Reorganization, Chapter 11 [Line Items]
Predecessor accumulated other comprehensive income	$ 0					$ 45
Inflation factor	2.00%
Average credit-adjusted risk-free rate	5.18%
Income tax effects on accumulated other comprehensive income	$ 57
Income tax benefit	57	$ 10	$ 0	$ 10	$ 13
Fresh Start Adjustments
Reorganization, Chapter 11 [Line Items]
Predecessor accumulated other comprehensive income	(48)	(9)		(9)
Income tax effects on accumulated other comprehensive income		$ 57		$ 57
Senior Notes | 5.5% senior notes due 2026
Reorganization, Chapter 11 [Line Items]
Debt, fair value adjustments	22
Senior Notes | 5.875% senior notes due 2029
Reorganization, Chapter 11 [Line Items]
Debt, fair value adjustments	$ 30

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