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Property and Equipment, Net Property and Equipment, Net (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 1,005 $ 1,015  
Less: accumulated depreciation (695) (698)  
Property and equipment, net 310 317 $ 342
Depreciation and amortization expense 110 109 $ 102
Furniture, fixtures and equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 166 188  
Capitalized software      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 463 444  
Finance lease assets      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 78 80  
Building and leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 295 300  
Land      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 3 $ 3