Income Taxes - Deferred Tax Assets and Liabilities Table (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred tax liabilities:
Other	$ (3)	$ (3)
Deferred tax liabilities	(3)	(3)
Deferred tax assets:
Property, plant and equipment	340	907
Net operating loss carryforwards	784	2,066
Carrying value of debt	31	48
Excess business interest expense carryforward	684	293
Asset retirement obligations	86	34
Investments	66	71
Accrued liabilities	38	288
Derivative instruments	289	53
Other	68	51
Deferred tax assets	2,386	3,811
Valuation allowance	(2,383)	(3,808)
Deferred tax assets after valuation allowance	3	3
Net deferred tax liability	$ 0	$ 0