CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]	Reorganization Adjustments Additional Paid-in Capital [Member]
Balance, beginning balance at Dec. 31, 2018	$ (3,666)	$ 1	$ 6,711	$ (8,671)	$ (1,746)	$ 39
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	3,684	0	0	3,661	0	23
Other Comprehensive Loss	49				49
Dividends Paid to Noncontrolling Interests	(22)					(22)
Equity Awards Granted, Vested and Exercised	(22)		(22)
Accelerated Stock Compensation due to Plan Effects	24		24
Stockholders' Equity, Other	2		0			2
Balance, ending balance at Dec. 13, 2019	2,931	0	2,897	0	0	34
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	(24)			(26)		2
Other Comprehensive Loss	9				9
Balance, ending balance at Dec. 31, 2019	2,916	0	2,897	(26)	9	36
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Fresh-Start Adjustment, Issuance Of Successor Common Stock To Creditors							$ 2,837
Fresh-Start Adjustment, Issuance Of Common Stock To Former Stockholders							29
Fresh-Start Adjustment, Issuance Of Warrants							$ 31
Net Income (Loss)	(1,899)			(1,921)		22
Other Comprehensive Loss	(52)				(52)
Dividends Paid to Noncontrolling Interests	(28)					(28)
Balance, ending balance at Dec. 31, 2020	937	0	2,897
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	(429)			(450)		21
Other Comprehensive Loss	8				8
Dividends Paid to Noncontrolling Interests	(27)					(27)
Equity Awards Granted, Vested and Exercised	(7)		(7)
Balance, ending balance at Dec. 31, 2021	$ 496	$ 0	$ 2,904	$ (2,397)	$ (35)	$ 24