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Property, Equipment, and Capitalized Software - Summary of Property, Equipment, and Capitalized Software (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Summary of property and equipment    
Property and equipment, gross $ 919 $ 755
Less: accumulated amortization for capitalized software (259) (195)
Less: accumulated depreciation and amortization on building and improvements, furniture and equipment (206) (167)
Accumulated depreciation, Total (465) (362)
Property, equipment, and capitalized software, net 454 393
Capitalized software    
Summary of property and equipment    
Property and equipment, gross 443 336
Furniture and equipment    
Summary of property and equipment    
Property and equipment, gross 301 250
Building and improvements    
Summary of property and equipment    
Property and equipment, gross 159 153
Land    
Summary of property and equipment    
Property and equipment, gross $ 16 $ 16