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Property and Equipment (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Property, Plant and Equipment [Line Items]          
Property and equipment, gross $ 1,446   $ 1,446   $ 1,292
Less: Accumulated depreciation (714)   (714)   (632)
Property and equipment, net 732   732   660
Depreciation 78 $ 51 149 $ 102  
Computer equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 1,104   1,104   974
Computer software          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 77   77   72
Leasehold and other improvements          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 183   183   168
Furniture and fixtures          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 70   70   69
Construction in progress          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross $ 12   $ 12   $ 9