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Derivative Financial Instruments - Derivative Instruments and their Balance Sheet Classifications (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Derivative Assets $ 36 $ 59
Derivative Liabilities 186 40
Designated as Hedging Instruments [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 15 40
Derivative Liabilities 142 27
Not Designated As Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 21 19
Derivative Liabilities 44 13
Foreign exchange contracts [Member] | Prepaid and other current assets [Member] | Designated as Hedging Instruments [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 9 35
Foreign exchange contracts [Member] | Prepaid and other current assets [Member] | Designated as Hedging Instruments [Member] | Accrued liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 97 18
Foreign exchange contracts [Member] | Prepaid and other current assets [Member] | Not Designated As Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 21 19
Foreign exchange contracts [Member] | Prepaid and other current assets [Member] | Not Designated As Hedging Instrument [Member] | Accrued liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 43 13
Foreign exchange contracts [Member] | Other Assets [Member] | Designated as Hedging Instruments [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 6 5
Foreign exchange contracts [Member] | Other Assets [Member] | Not Designated As Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 0  
Foreign exchange contracts [Member] | Other Liabilities [Member] | Designated as Hedging Instruments [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 45 9
Foreign exchange contracts [Member] | Other Liabilities [Member] | Not Designated As Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities $ 1