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Property, Equipment and Intangible Assets (Property And Equipment) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Property, Equipment and Intangible Assets [Abstract]    
Leasehold improvements $ 43 $ 42
Computer equipment 67 41
Office furniture and equipment 15 14
Property and equipment, gross 125 97
Less—accumulated depreciation and amortization (40) (30)
Property and equipment, net 85 67
Internally developed software 77 73
Other intangible assets 4  
Less-accumulated amortization (35) (36)
Intangible assets, net 46 37
Total property equipment and intangible assets, net $ 131 $ 104