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Property, Equipment and Intangible Assets (Property And Equipment) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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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

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