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Property, Equipment, and Capitalized Software, Net - Summary of Property, Equipment, and Capitalized Software (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Summary of property and equipment    
Property and equipment, gross $ 883 $ 919
Less: accumulated amortization - capitalized software (308) (259)
Less: accumulated depreciation and amortization - building and improvements, furniture and equipment (233) (206)
Accumulated depreciation, Total (541) (465)
Property, equipment, and capitalized software, net 342 454
Capitalized software    
Summary of property and equipment    
Property and equipment, gross 417 443
Furniture and equipment    
Summary of property and equipment    
Property and equipment, gross 289 301
Building and improvements    
Summary of property and equipment    
Property and equipment, gross 161 159
Land    
Summary of property and equipment    
Property and equipment, gross $ 16 $ 16