Income Taxes - Deferred Tax Assets and Liabilities Table (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Deferred tax liabilities:
Property, plant and equipment	$ (544)	$ 0
Volumetric production payments	(117)	(129)
Carrying value of debt	(95)	0
Derivative instruments	(56)	0
Other	(7)	(20)
Deferred tax liabilities	(819)	(149)
Deferred tax assets:
Property, plant and equipment	0	1
Net operating loss carryforwards	2,737	2,248
Carrying value of debt	0	161
Disallowed business interest carryforward	194	0
Asset retirement obligations	40	42
Investments	132	161
Derivative instruments	0	17
Accrued liabilities	89	125
Other	60	71
Deferred tax assets	3,252	2,826
Valuation allowance	(2,433)	(2,674)
Net deferred tax assets	819	152
Net deferred tax assets	$ 0	$ 3