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Financial Instruments and Derivative Contracts - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2010
4.6% Bonds [Member]
Debt Instrument [Line Items]      
Amount converted by interest rate swap execution     $ 500
Interest rate of fixed bonds     4.60%
Payment term of receivables 30 days or less    
Aggregate fair value of all derivative instruments in a liability position 237    
Collateral was posted for derivative instruments in a liability position 3    
Additional collateral, either in the form of cash or letters of credit 234    
Carrying value of share investment in LUKOIL   1,083 [1]  
Closing price per share on London Stock Exchange   $ 56.50  
Fixed-rate on joint venture acquisition obligation 5.30%    
Effective yield rate 1.24% 1.87%  
Obligations to return cash collateral 0 5  
Rights to reclaim cash collateral $ 244 $ 324  
[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.