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Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets, Net [Abstract]    
Definite-lived intangible assets, amortization expense $ 100 $ 48
Estimates annual amortization expense, 2017 90  
Estimates annual amortization expense, 2018 82  
Estimates annual amortization expense, 2019 66  
Estimates annual amortization expense, 2020 47  
Estimates annual amortization expense, 2021 $ 44