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Income Taxes - Reconciliation of Unrecognized Tax Benefits (Excluding Interest and Penalties) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Balance at beginning of year $ 18 $ 7 $ 8
Additions for tax positions of the current year 12    
Additions for tax positions of prior years   14 4
Reductions for tax positions of prior years   (2) (3)
Settlements with tax authorities (1)   (1)
Expiration of the statute of limitations (1) (1)  
Foreign currency translation     (1)
Balance at end of year $ 28 $ 18 $ 7