Other Liabilities - Current Table (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Other Liabilities Disclosure [Abstract]
Revenues and royalties due others	$ 584	$ 612
Accrued drilling and production costs	297	216
Joint interest prepayments received	76	74
Accrued compensation and benefits	125	214
Accrued restructuring and other termination costs	27	0
Other accrued taxes	41	43
Other	207	296
Current liabilities	$ 1,357	$ 1,455