Other Liabilities - Current Table (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Other Current Liabilities [Line Items]
Accrued Royalties, Current	$ 757	$ 1,176
Accrued Drilling And Production Costs	327	385
Prepayments Received	202	189
Employee-related Liabilities, Current	237	344
Accrual for Taxes Other than Income Taxes, Current	130	55
Dividends Payable, Current	43	101
Other Accrued Liabilities, Current	400	592
Other current liabilities ($11 and $15 attributable to our VIE)	2,649	3,061
Redemption of 2019 Notes [Member]
Other Current Liabilities [Line Items]
Estimated Litigation Liability	439	100
Oklahoma Royalty Settlement [Member]
Other Current Liabilities [Line Items]
Estimated Litigation Liability	$ 114	$ 119