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Property and Equipment, Net Property and Equipment, Net (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 867 $ 811  
Less: accumulated depreciation (559) (538)  
Property and equipment, net 308 273  
Depreciation and amortization expense 93 88 $ 85
Furniture, fixtures and equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 162 176  
Capitalized software      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 334 293  
Assets Held under Finance/Capital Leases      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 76 64  
Building and leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 292 275  
Land      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 3 $ 3