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Property, Equipment and Intangible Assets (Property And Equipment) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Property, Equipment and Intangible Assets [Abstract]    
Leasehold improvements $ 28 $ 56
Computer equipment 67 90
Office furniture and equipment 15 15
Property and equipment, gross 110 161
Less—accumulated depreciation and amortization (51) (80)
Property and equipment, net 59 81
Internally developed software 88 84
Other intangible assets 4 4
Less-accumulated amortization (44) (45)
Intangible assets, net 48 43
Total property equipment and intangible assets, net $ 107 $ 124