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Property, Equipment and Intangible Assets (Property And Equipment) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Property, Equipment and Intangible Assets [Abstract]    
Leasehold improvements $ 56 $ 51
Computer equipment 90 84
Office furniture and equipment 15 16
Property and equipment, gross 161 151
Less—accumulated depreciation and amortization (80) (58)
Property and equipment, net 81 93
Internally developed software 84 87
Other intangible assets 4 4
Less-accumulated amortization (45) (43)
Intangible assets, net 43 48
Total property equipment and intangible assets, net $ 124 $ 141