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Note 6. Property and Equipment, Net Property and Equipment, Net (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 915 $ 843  
Less: accumulated depreciation (626) (576)  
Property and equipment, net 289 267 $ 254
Depreciation and amortization expense 96 89 $ 84
Furniture, fixtures and equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 281 254  
Capitalized software      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 366 351  
Building and leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 265 235  
Land      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 3 $ 3