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Stockholders' Equity - Summary of Non-controlling Interests (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Equity [Abstract]        
Beginning Balance     $ 249 $ 227
Distribution to non-controlling interest     (29)  
Investment by non-controlling interest     10  
Comprehensive income:        
Net income $ 7 $ 5 18 11
Foreign currency adjustments, net of income tax     (3) 5
Ending Balance $ 245 $ 243 $ 245 $ 243