Income Taxes (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Jul. 31, 2013	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jul. 20, 2015
Components of income (loss) before income taxes [Abstract]
Domestic			$ (2,338)	$ 282	$ 202
Foreign			119	1,428	1,142
Income (Loss) from Continuing Operations Before Income Taxes			(2,219)	1,710	1,344
Current Taxes
Federal			(1)	19	21
State			0	1	1
Foreign			107	208	144
Total Current			106	228	166
Deferred Taxes
Federal			216	237	96
State			(5)	13	1
Foreign			(95)	18	174
Total Deferred			116	268	271
Total Income Tax Provision			$ 222	$ 496	$ 437
Effective Tax Rate (in hundredths)			(10.00%)	29.00%	32.50%
Federal statutory tax rate reconciliation [Abstract]
Federal Statutory Rate (in hundredths)			35.00%	35.00%	35.00%
Effect of
Earnings of Equity Method Investees (in hundredths)			0.60%	(3.30%)	(5.30%)
State Taxes, Net of Federal Benefit (in hundredths)			0.30%	0.80%	0.10%
Difference Between US and Foreign Rates (in hundredths)			2.60%	(14.20%)	(6.30%)
Foreign Exploration Loss (in hundredths)			2.70%	0.00%	2.70%
Change in Valuation Allowance (in hundredths)			0.00%	1.90%	3.80%
Oil Profits Tax - Israel (in hundredths)			0.10%	0.20%	0.30%
Tax Contingency (in hundredths)			0.40%	0.10%	0.40%
Indefinite Reinvestment of Foreign Earnings (in hundredths)			(37.70%)	8.20%	0.00%
Goodwill Impairment			(12.30%)	0.00%	0.00%
Other, Net (in hundredths)			(1.70%)	0.30%	1.80%
Effective Tax Rate (in hundredths)			(10.00%)	29.00%	32.50%
Deferred Tax Assets
Loss Carryforwards		$ 468	$ 468	$ 170
Employee Compensation and Benefits		151	151	149
Foreign Tax Credits		0	0	67
Other		81	81	51
Total Deferred Tax Assets		700	700	437
Net Deferred Tax Assets		494	494	224
Deferred Tax Liabilities
Mark to Market of Commodity Derivative Instruments		(128)	(128)	(209)
Accumulated Undistributed Foreign Earnings		368	368	141
Property, Plant and Equipment, Principally Due to Differences in Depreciation, Amortization, Lease Impairment and Abandonments		(2,824)	(2,824)	(2,548)
Deferred Tax Liabilities, Gross		3,320	3,320	2,898
Total Deferred Tax Liability		(2,826)	(2,826)	(2,674)
Deferred Tax Liabilities, Deferred Expense					$ 12
Deferred Tax Asset and Liability Classification [Abstract]
Deferred Tax Liabilities, Net, Current		0	0	(158)
Deferred Income Tax Liability - Noncurrent		(2,826)	(2,826)	(2,516)
Accumulated Undistributed Earnings of Foreign Subsidiaries [Abstract]
Accumulated undistributed earnings of foreign subsidiaries		1,600	1,600
Estimated future US taxes on the eventual remittance of accumulated undistributed foreign subsidiary earnings		227	$ 227
US [Member]
Earliest Year Open to Examination [Abstract]
Income Tax Examination, Year under Examination			2012
Equatorial Guinea [Member]
Earliest Year Open to Examination [Abstract]
Income Tax Examination, Year under Examination			2010
Israel [Member]
Effect of
Difference Between US and Foreign Rates (in hundredths)	25.00%
Statutory Federal Corporate Tax Rate Future Year	26.50%
Earliest Year Open to Examination [Abstract]
Income Tax Examination, Year under Examination			2011
Foreign Loss Carryforward [Member]
Deferred Tax Assets
Deferred Tax Assets, Valuation Allowance		(206)	$ (206)	(145)
Deferred Tax Liabilities
Valuation Allowance Deferred Tax Asset Reversal			60
Foreign Tax Credit [Member]
Deferred Tax Assets
Deferred Tax Assets, Valuation Allowance		0	0	(67)
Deferred Tax Liabilities
Accumulated Undistributed Foreign Earnings		141	141
Valuation Allowance Deferred Tax Asset Reversal		36
Capital Loss Carryforward [Member]
Deferred Tax Assets
Deferred Tax Assets, Valuation Allowance		$ 0	$ 0	$ (1)
Rosetta Resources, Inc
Deferred Tax Liabilities
Operating Loss Carryforwards						$ 681