Income Taxes - Deferred Tax Assets and Liabilities Table (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Deferred tax liabilities:
Property, plant and equipment	$ 0	$ (546)
Volumetric production payments	0	(89)
Derivative instruments	0	(14)
Other	(3)	(5)
Deferred tax liabilities	(3)	(654)
Deferred tax assets:
Property, plant and equipment	907	0
Net operating loss carryforwards	2,066	1,971
Carrying value of debt	48	169
Disallowed business interest carryforward	293	25
Asset retirement obligations	34	50
Investments	71	83
Accrued liabilities	288	64
Derivative instruments	53	0
Other	51	87
Deferred tax assets	3,811	2,449
Valuation allowance	(3,808)	(1,805)
Deferred tax assets after valuation allowance	3	644
Net deferred tax liability	$ 0	$ (10)