Fresh Start Accounting - Impact on Accumulated Deficit (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Feb. 09, 2021
Reorganization, Chapter 11 [Line Items]
Total property and equipment, net			$ (5,670)
Other long-term assets	$ (78)	$ (104)	(114)
Debt			1,313
Asset retirement obligations, net of current portion	334	349
AOCI, after tax			0
Total liabilities and stockholders’ equity	13,293	$ 11,009	6,814
Income tax effects on accumulated other comprehensive income			57
Fresh Start Adjustments
Reorganization, Chapter 11 [Line Items]
Total property and equipment, net	443		(443)
Other long-term assets	(84)		84
Debt	(52)		52
Asset retirement obligations, net of current portion	(97)
AOCI, after tax	(9)		(48)
Total liabilities and stockholders’ equity	201		$ 359
Income tax effects on accumulated other comprehensive income	57
Net impact to accumulated deficit	$ 258