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Property and Equipment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 557 $ 544  
Accumulated depreciation and amortization (384) (376)  
Property and equipment, net 173 168  
Depreciation 53 55 $ 59
Furniture, fixtures and equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 161 163  
Data processing equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 155 145  
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 126 121  
Buildings      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 93 95  
Land      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 14 14  
Other      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 8 $ 6