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Fresh Start Accounting - Fresh Start Adjustments (Details) - USD ($) $ in Millions		1 Months Ended	11 Months Ended	12 Months Ended
	Feb. 09, 2021	Feb. 09, 2021	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2020
Reorganization, Chapter 11 [Line Items]
Accumulated other comprehensive income	$ 0	$ 0
Inflation factor	2.00%	2.00%
Average credit-adjusted risk-free rate	5.18%	5.18%
Income tax effects on accumulated other comprehensive income	$ 57	$ 57
Income tax benefit	57	57	$ 49	$ 1,285	$ 19
Reorganization, Chapter 11, Fresh-Start Adjustment
Reorganization, Chapter 11 [Line Items]
Accumulated other comprehensive income	(48)	(48)
Income tax effects on accumulated other comprehensive income	57	57
Senior notes | 5.50% senior notes due 2026
Reorganization, Chapter 11 [Line Items]
Debt, fair value adjustments	22	22
Senior notes | 5.875% senior notes due 2029
Reorganization, Chapter 11 [Line Items]
Debt, fair value adjustments	$ 30	$ 30

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