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Intangible Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Intangible Assets, cost $ 1,128 $ 986
Intangible assets, net $ 650 621
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated weighted average useful life in years 10 years  
Intangible Assets, cost $ 438 392
Intangible Assets, accumulated depreciation $ (162) (96)
Computer software [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated weighted average useful life in years 3 years  
Intangible Assets, cost $ 348 316
Intangible Assets, accumulated depreciation $ (263) (242)
Patent And License [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated weighted average useful life in years 13 years  
Intangible Assets, cost $ 342 278
Intangible Assets, accumulated depreciation $ (53) $ (27)