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VARIABLE INTEREST ENTITIES - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Consolidated VIEs, aggregated | Minimum      
Variable Interest Entities      
Outsourcing agreement initial term 5 years    
Consolidated VIEs | Eliminations      
Variable Interest Entities      
Liabilities associated with the certain outsourcing agreements and purchase options $ 127 $ 125  
VIEs which are not primary beneficiary      
Variable Interest Entities      
Carrying amount of investments in VIEs 71 71  
Gain (loss) on equity investments $ (50) $ (45) $ (5)