v2.4.0.6
Financial Instruments and Derivative Contracts - Commodity Derivative and Financial Instruments (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Financial Assets    
Investment in LUKOIL   $ 1,083 [1]
Fair Value [Member] | Foreign currency exchange derivatives [Member]
   
Financial Assets    
Foreign currency exchange derivatives 13 15
Financial Liabilities    
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value 23 9
Fair Value [Member] | Interest rate derivatives [Member]
   
Financial Assets    
Interest rate derivatives 31 20
Fair Value [Member] | Commodity Contract [Member]
   
Financial Assets    
Price Risk Derivative Assets, at Fair Value 814 624
Financial Liabilities    
Price Risk Derivative Liabilities, at Fair Value 446 426
Fair Value [Member] | LUKOIL Investment [Member]
   
Financial Assets    
Investment in LUKOIL at fair value   1,083
Fair Value [Member] | Total debt, excluding capital leases [Member]
   
Financial Liabilities    
Total debt, excluding capital leases 27,065 26,144
Fair Value [Member] | Joint Venture Acquisition Obligation [Member]
   
Financial Liabilities    
Joint venture acquisition obligation at fair value 4,820 5,600
Carrying Amount [Member] | Foreign currency exchange derivatives [Member]
   
Financial Assets    
Foreign currency exchange derivatives 13 15
Financial Liabilities    
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value 23 9
Carrying Amount [Member] | Interest rate derivatives [Member]
   
Financial Assets    
Interest rate derivatives 31 20
Carrying Amount [Member] | Commodity Contract [Member]
   
Financial Assets    
Price Risk Derivative Assets, at Fair Value 814 624
Financial Liabilities    
Price Risk Derivative Liabilities, at Fair Value 446 426
Carrying Amount [Member] | LUKOIL Investment [Member]
   
Financial Assets    
Investment in LUKOIL   1,083
Carrying Amount [Member] | Total debt, excluding capital leases [Member]
   
Financial Liabilities    
Total debt, excluding capital leases, carrying amount 22,592 23,553
Carrying Amount [Member] | Joint Venture Acquisition Obligation [Member]
   
Financial Liabilities    
Joint venture acquisition obligation at carrying value $ 4,314 $ 5,009
[1] Certain amounts have been restated to reflect a prior period adjustment. See Note 21-Accumulated Other Comprehensive Income, in the Notes to Consolidated Financial Statements.