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Financial Instruments and Risk Management - Effect on Consolidated Statements of Income of Derivative Instruments Not Designated as Hedge (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]    
Foreign exchange forward contracts $ 11 $ 10
Foreign Exchange Forward Contracts [Member] | Other Income and Expenses, Net [Member] | Not Designated as Hedging Instrument [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Foreign exchange forward contracts $ 11 $ 10