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Derivative Instruments and Balance Sheet Classifications (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Derivatives, Fair Value [Line Items]    
Derivative Assets $ 81 $ 26
Derivative Liabilities 34 96
Derivatives designated as hedging instruments
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 64 17
Derivative Liabilities 17 75
Not Designated As Hedging Instrument
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 17 9
Derivative Liabilities 17 21
Foreign exchange contracts | Accrued Liabilities | Derivatives designated as hedging instruments
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 16 62
Foreign exchange contracts | Accrued Liabilities | Not Designated As Hedging Instrument
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 17 21
Foreign exchange contracts | Other Liabilities | Derivatives designated as hedging instruments
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 1 13
Foreign exchange contracts | Prepaid and other current assets | Derivatives designated as hedging instruments
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 42 16
Foreign exchange contracts | Prepaid and other current assets | Not Designated As Hedging Instrument
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 17 9
Foreign exchange contracts | Other Assets | Derivatives designated as hedging instruments
   
Derivatives, Fair Value [Line Items]    
Derivative Assets $ 22 $ 1