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Fresh Start Accounting - Impact on Accumulated Deficit (Details) - USD ($) $ in Millions	Sep. 30, 2021	Feb. 09, 2021	Dec. 31, 2020
Reorganization, Chapter 11 [Line Items]
Total property and equipment, net		$ (5,670)
Other long-term assets	$ (84)	(114)	$ (234)
Debt		1,313
Asset retirement obligations, net of current portion	244		139
Predecessor accumulated other comprehensive income		0	45
Total liabilities and stockholders’ equity (deficit)	7,326	6,814	$ 6,584
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)
Predecessor accumulated other comprehensive income	(9)	(48)
Total liabilities and stockholders’ equity (deficit)	201	$ 359
Income tax effects on accumulated other comprehensive income	57
Net impact to accumulated deficit	$ 258

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