v3.19.3.a.u2
Property and Equipment - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]      
Depreciation and amortization expense $ 182 $ 154 $ 132
Equipment and Computer Software [Member]      
Property, Plant and Equipment [Line Items]      
Qualifying software costs $ 93 $ 77 $ 60
Estimated useful life 3 years