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Accumulated Other Comprehensive Loss - Other Comprehensive Loss Before Reclassifications Associated With the Effective Portion of Derivatives Designated as Cash Flow Hedges (Detail) - Derivative Instruments [Member] - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Tax benefit $ 0 $ 4
Net of tax   (7)
Foreign Currency Derivatives [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive loss on derivatives before tax   $ (11)