Other Liabilities - Current Table (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Other Current Liabilities [Line Items]
Accrued Royalties, Current	$ 627	$ 1,176
Accrued Drilling And Production Costs	231	385
Prepayments Received	181	189
Employee-related Liabilities, Current	295	344
Accrual for Taxes Other than Income Taxes, Current	105	55
Dividends Payable, Current	43	101
Other Accrued Liabilities, Current	453	592
Other current liabilities ($11 and $15 attributable to our VIE)	2,374	3,061
Redemption of 2019 Notes [Member]
Other Current Liabilities [Line Items]
Estimated Litigation Liability	439	100
Royalty Settlement [Member]
Other Current Liabilities [Line Items]
Estimated Litigation Liability	$ 0	$ 119