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PROPERTY, EQUIPMENT AND SOFTWARE, NET (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 273 $ 245
Less: Accumulated depreciation (194) (160)
Property and equipment, net 79 85
Software    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 204 174
Office equipment, including data processing equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 28 27
Leasehold improvements    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 24 24
Furniture, fixtures, and equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 16 17
Projects in progress    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 1 $ 3