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Acquisitions - Summary of Purchase Price Allocation (Parenthetical) (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
Business Acquisition [Line Items]  
Goodwill $ 116
Trade Names [Member]  
Business Acquisition [Line Items]  
Estimated useful lives 20 years
Customer Relationships [Member]  
Business Acquisition [Line Items]  
Estimated useful lives 10 years