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Property, Equipment, and Capitalized Software, Net - Summary of Property, Equipment, and Capitalized Software (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Summary of property and equipment    
Property and equipment, gross $ 774 $ 883
Less: accumulated amortization - capitalized software (320) (308)
Less: accumulated depreciation and amortization - building and improvements, furniture and equipment (213) (233)
Total accumulated depreciation and amortization (533) (541)
Property, equipment, and capitalized software, net 241 342
Capitalized software    
Summary of property and equipment    
Property and equipment, gross 373 417
Furniture and equipment    
Summary of property and equipment    
Property and equipment, gross 231 289
Building and improvements    
Summary of property and equipment    
Property and equipment, gross 154 161
Land    
Summary of property and equipment    
Property and equipment, gross $ 16 $ 16