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Property and Equipment, Net (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 209 $ 174
Less: Accumulated depreciation (130) (104)
Property and equipment, net 79 70
Software    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 144 114
Office equipment, including data processing equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 27 23
Leasehold improvements    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 21 15
Furniture, fixtures, and equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 15 15
Projects in progress    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 2 $ 7