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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative [Line Items]      
Estimated net amount of existing (losses) expected to be reclassified into income within the next 12 months $ 12    
Foreign Exchange Forward [Member]      
Derivative [Line Items]      
Pre-tax gain (loss) on Derivatives $ (18) $ (8) $ 1
Foreign Currency Forward Contracts [Member]      
Derivative [Line Items]      
Foreign currency forward contracts, maturity year 2020