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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Impairment of Intangible Assets $ 0 $ 0  
Goodwill accumulated impairment 0 0  
Goodwill impairment loss 0 $ 0 $ 0
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) $ 17    
Goodwill [Member] | Discounted cash flows | Minimum      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Discount rate (percent) 8.00%    
Goodwill [Member] | Discounted cash flows | Maximum      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Discount rate (percent) 13.00%