Annual report pursuant to Section 13 and 15(d)

Property and Equipment, Net Property and Equipment, Net (Details)

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Property and Equipment, Net Property and Equipment, Net (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 701 $ 513
Less: Accumulated depreciation 375 263
Property and equipment, net 326 250
Land    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 17 14
Buildings and leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 212 171
Capitalized software    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 292 242
Furniture, fixtures and equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 86 69
Capital leases    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 72 5
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 22 $ 12