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Financial Instruments and Risk Management - Fair Value of Derivative Instruments (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Derivatives, Fair Value [Line Items]    
Total Asset Derivatives $ 43 $ 36
Total Liability Derivatives (4) (1)
Designated as Hedging Instrument [Member]
    
Derivatives, Fair Value [Line Items]    
Total Asset Derivatives 41 29
Total Liability Derivatives (3)  
Designated as Hedging Instrument [Member] | Forward Contracts [Member] | Other Current Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Total Asset Derivatives 26 21
Designated as Hedging Instrument [Member] | Forward Contracts [Member] | Other Payables And Accrued Liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Total Liability Derivatives (1)  
Designated as Hedging Instrument [Member] | Collars [Member] | Other Current Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Total Asset Derivatives 10 8
Designated as Hedging Instrument [Member] | Collars [Member] | Other Payables And Accrued Liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Total Liability Derivatives (2)  
Designated as Hedging Instrument [Member] | Currency Options [Member] | Other Current Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Total Asset Derivatives 5  
Not Designated as Hedging Instrument [Member]
    
Derivatives, Fair Value [Line Items]    
Total Asset Derivatives 2 7
Total Liability Derivatives (1) (1)
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] | Other Current Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Total Asset Derivatives 2 7
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] | Other Payables And Accrued Liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Total Liability Derivatives $ (1) $ (1)