Other Liabilities - Current Table (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Other Liabilities Disclosure [Abstract]
Revenues and royalties due others	$ 562	$ 687
Accrued drilling and production costs	467	258
Joint interest prepayments received	69	73
Joint interest prepayments received	58	59
Accrued compensation and benefits	114	202
Other accrued taxes	105	108
Other	216	212
Total other current liabilities	$ 1,591	$ 1,599