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Property and Equipment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 544 $ 670  
Accumulated depreciation and amortization (376) (491)  
Property and equipment, net 168 179  
Depreciation 55 59 $ 45
Furniture, fixtures and equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 163 235  
Data processing equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 145 212  
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 121 118  
Buildings      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 95 84  
Land      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 14 14  
Other      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 6 $ 7