Other Liabilities - Current Table (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Other Current Liabilities [Line Items]
Revenues and royalties due others	$ 378	$ 500
Accrued drilling and production costs	216	212
Joint interest prepayments received	103	169
Accrued compensation and benefits	151	264
Other accrued taxes	57	37
Minimum gathering volume commitment	4	201
Other current liabilities	196	397
Total other current liabilities	1,544	2,219
Bank of New York Melton legal accrual [Member]
Other Current Liabilities [Line Items]
Estimated Litigation Liability	$ 439	$ 439