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Property and Equipment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 670 $ 668  
Accumulated depreciation and amortization (491) (483)  
Property and equipment, net 179 185  
Depreciation 59 45 $ 48
Furniture, fixtures and equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 235 239  
Data processing equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 212 210  
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 118 121  
Buildings      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 84 79  
Land      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 14 14  
Other      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 7 $ 5