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Financial Instruments and Risk Management - Fair Value of Derivative Instruments (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Total Asset Derivatives $ 6 $ 1
Total Liability Derivatives (25) (73)
Foreign Exchange Forward Contracts [Member]    
Derivatives, Fair Value [Line Items]    
Total Asset Derivatives 4  
Total Liability Derivatives (19)  
Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Total Asset Derivatives 5  
Total Liability Derivatives (24) (71)
Designated as Hedging Instrument [Member] | Foreign Exchange Forward Contracts [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Total Asset Derivatives 3  
Designated as Hedging Instrument [Member] | Foreign Exchange Forward Contracts [Member] | Other Payables and Accrued Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Total Liability Derivatives (18) (43)
Designated as Hedging Instrument [Member] | Currency Collars [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Total Asset Derivatives 1  
Designated as Hedging Instrument [Member] | Currency Collars [Member] | Other Payables and Accrued Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Total Liability Derivatives (6) (28)
Designated as Hedging Instrument [Member] | Currency Collars [Member] | Other Noncurrent Assets [Member]    
Derivatives, Fair Value [Line Items]    
Total Asset Derivatives 1  
Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Total Asset Derivatives 1 1
Total Liability Derivatives (1) (2)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward Contracts [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Total Asset Derivatives 1 1
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward Contracts [Member] | Other Payables and Accrued Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Total Liability Derivatives $ (1) $ (2)