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Intangible Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Intangible Assets, cost $ 1,093 $ 993
Intangible assets, net $ 481 484
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated weighted average useful life in years 8 years  
Intangible Assets, cost $ 348 333
Intangible Assets, accumulated depreciation $ (150) (120)
Computer software [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated weighted average useful life in years 1 year  
Intangible Assets, cost $ 463 396
Intangible Assets, accumulated depreciation $ (361) (310)
Patent And License [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated weighted average useful life in years 10 years  
Intangible Assets, cost $ 282 264
Intangible Assets, accumulated depreciation $ (101) $ (79)