v3.20.4
Property and Equipment - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Depreciation and amortization expense $ 232 $ 182 $ 154
Equipment and Computer Software [Member]      
Property, Plant and Equipment [Line Items]      
Qualifying software costs $ 95 $ 93 $ 77
Estimated useful life 3 years 3 years