Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Components of income (loss) before income taxes [Abstract]
Domestic	$ 92,000,000	$ (537,000,000)	$ 234,000,000
Foreign	1,264,000,000	1,039,000,000	614,000,000
Total	1,356,000,000	502,000,000	848,000,000
Current Taxes [Abstract]
Federal	14,000,000	11,000,000	25,000,000
State	1,000,000	2,000,000	2,000,000
Foreign	143,000,000	155,000,000	97,000,000
Total Current	158,000,000	168,000,000	124,000,000
Deferred Taxes [Abstract]
Federal	60,000,000	(130,000,000)	86,000,000
State	1,000,000	(3,000,000)	1,000,000
Foreign	172,000,000	55,000,000	6,000,000
Total Deferred	233,000,000	(78,000,000)	93,000,000
Total Income Tax Provision	391,000,000	90,000,000	217,000,000
Effective Tax Rate (in hundredths)	28.80%	17.90%	25.60%
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)	(4.90%)	(13.30%)	(4.80%)
State Taxes, Net of Federal Benefit (in hundredths)	0.20%	(0.10%)	0.40%
Difference Between US and Foreign Rates (in hundredths)	(4.90%)	(7.00%)	(1.20%)
Foreign Exploration Loss (in hundredths)	(3.80%)	(4.20%)	0.00%
Change in Valuation Allowance (in hundredths)	4.30%	6.60%	(2.70%)
Oil Profits Tax - Israel (in hundredths)	0.90%	2.60%	(1.90%)
Tax Contingency (in hundredths)	1.80%	0.00%	0.00%
Other, Net (in hundredths)	0.20%	(1.70%)	0.80%
Effective Rate (in hundredths)	28.80%	17.90%	25.60%
Deferred Tax Assets [Abstract]
Loss Carryforwards	235,000,000	200,000,000
Employee Compensation & Benefits	134,000,000	164,000,000
Foreign Tax Credits	38,000,000	57,000,000
Other	81,000,000	86,000,000
Total Deferred Tax Assets	488,000,000	507,000,000
Valuation Allowance - Foreign Loss Carryforwards	(81,000,000)	(65,000,000)	(70,000,000)
Tax Credit Carryforward, Valuation Allowance	(38,000,000)	(57,000,000)
Net Deferred Tax Assets	369,000,000	385,000,000
Deferred Tax Liabilities [Abstract]
Property, Plant and Equipment, Principally Due to Differences in Depreciation, Amortization, Lease Impairment and Abandonments	(2,481,000,000)	(2,409,000,000)
Total Deferred Tax Liability	(2,481,000,000)	(2,409,000,000)
Net Deferred Tax Liability	(2,112,000,000)	(2,024,000,000)
Deferred Tax Asset and Liability Classification [Abstract]
Deferred Income Tax Asset - Current	106,000,000	41,000,000
Deferred Income Tax Liability - Current	0	(6,000,000)
Deferred Income Tax Liability - Noncurrent	(2,218,000,000)	(2,059,000,000)
Net Deferred Tax Liability	(2,112,000,000)	(2,024,000,000)
Deferred Tax Assets [Abstract]
Valuation Allowance - Foreign Loss Carryforwards	81,000,000	65,000,000	70,000,000
Deferred Tax Asset for future foreign trax credits reversed	57,000,000
Deferred Tax Liability Release	12,000,000
Valuation Allowance, Deferred Tax Asset, Change in Amount		57,000,000	28,000,000
Change in Israeli Tax Law [Abstract]
Percentage point change in 2011 consolidated effective tax rate due to changes in Israeli Oil Profits Taxation Law (in hundredths)		4.00%
Accumulated Undistributed Earnings of Foreign Subsidiaries [Abstract]
Accumulated undistributed earnings of foreign subsidiaries	2,600,000,000
Estimated future US taxes on the eventual remittance of accumulated undistributed foreign subsidiary earnings	$ 685,000,000
US [Member]
Earliest Year Open to Examination [Abstract]
Income Tax Examination, Year under Examination	2009
Equatorial Guinea [Member]
Earliest Year Open to Examination [Abstract]
Income Tax Examination, Year under Examination	2007
Israel [Member]
Earliest Year Open to Examination [Abstract]
Income Tax Examination, Year under Examination	2008
China [Member]
Earliest Year Open to Examination [Abstract]
Income Tax Examination, Year under Examination	2006