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Property and Equipment (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 1,350   $ 1,292
Less: Accumulated depreciation (657)   (632)
Property and equipment, net 693   660
Depreciation 71 $ 51  
Computer equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 1,020   974
Computer software      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 74   72
Leasehold and other improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 180   168
Furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 70   69
Construction in progress      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 6   $ 9