Fair Value of Financial Assets and Liabilities (Detail) - Financial assets and liabilities measured on recurring basis - Foreign currency forward sale contracts - USD ($) $ in Millions		Mar. 31, 2017	Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value measurements on a recurring basis, Assets	[1]	$ 10	$ 12
Significant Other Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value measurements on a recurring basis, Assets	[1]	$ 10	$ 12

[1] These derivative contracts have been designated as hedging instruments.