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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Schedule Of Income Taxes [Line Items]      
Deferred taxes Included in current assets $ 788 $ 562  
Deferred taxes Included in long-term assets 183 160  
Deferred taxes Included in current liabilities 9 21  
Deferred taxes Included in long-term liabilities 18,040 [1] 17,320 [1]  
Increase (decrease) in valuation allowance 87    
Decrease in valuation allowance 87    
Increase in valuation allowance 174    
Income considered to be permanently reinvested in foreign subsidiaries and foreign corporate joint ventures 4,227 4,134  
Unrecognized tax benefits that if recognized, would affect effective tax rate 815 914 931
Accrued liabilities for interest and penalties 141 171 166
Interest and penalties affecting earnings 10 2 18
Supplementary UK Corporate Rate, before change 20.00%    
Supplementary UK Corporate Rate, after change 32.00%    
Overall UK Corporate Rate Before Change 50.00%    
Overall UK Corporate Rate, after change 62.00%    
Foreign Income Tax Expense Total, related to new rate 316    
Foreign Income Tax Expense Deferred, related to new rate 106    
Foreign Income Tax Expense Current, related to new rate $ 210    
[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.