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Derivative Financial Instruments - Derivative Instruments and their Balance Sheet Classifications (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Derivative Liabilities $ 38 $ 40
Derivative Assets 49 59
Designated as Hedging Instruments [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 26 27
Derivative Assets 27 40
Not Designated As Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 12 13
Derivative Assets 22 19
Foreign exchange contracts [Member] | Prepaid and other current assets [Member] | Designated as Hedging Instruments [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 18 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 13 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 12 13
Foreign exchange contracts [Member] | Other Assets [Member] | Designated as Hedging Instruments [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 9 5
Foreign exchange contracts [Member] | Other Assets [Member] | Not Designated As Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 1  
Foreign exchange contracts [Member] | Other Liabilities [Member] | Designated as Hedging Instruments [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 13 9
Foreign exchange contracts [Member] | Other Liabilities [Member] | Not Designated As Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities $ 0