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Derivative Financial Instruments - Derivative Instruments and their Balance Sheet Classifications (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Derivatives, Fair Value [Line Items]    
Derivative Assets $ 59 $ 105
Derivative Liabilities 40 19
Designated as Hedging Instruments [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 40 81
Derivative Liabilities 27 6
Not Designated As Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 19 24
Derivative Liabilities 13 13
Foreign exchange contracts [Member] | Not Designated As Hedging Instrument [Member] | Accrued liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 13 13
Foreign exchange contracts [Member] | Prepaid and other current assets [Member] | Designated as Hedging Instruments [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 35 57
Foreign exchange contracts [Member] | Prepaid and other current assets [Member] | Not Designated As Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 19 24
Foreign exchange contracts [Member] | Other Assets [Member] | Designated as Hedging Instruments [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 5 24
Foreign exchange contracts [Member] | Other Liabilities [Member] | Designated as Hedging Instruments [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 9 1
Foreign exchange contracts [Member] | Other Liabilities [Member] | Designated as Hedging Instruments [Member] | Accrued liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities $ 18 $ 5