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VARIABLE INTEREST ENTITIES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Consolidated VIEs, aggregated          
Variable Interest Entity [Line Items]          
Variable interest entities outsourcing agreement initial term     5 years    
VIEs which are not primary beneficiary          
Variable Interest Entity [Line Items]          
Carrying amount $ 71   $ 71   $ 71
(Loss) income from equity method investments (13) $ (10) (38) $ (34)  
Eliminations | Consolidated VIEs          
Variable Interest Entity [Line Items]          
Liabilities associated with the certain outsourcing agreements and purchase options $ 126   126   $ 125
Sustainable Energy Company          
Variable Interest Entity [Line Items]          
Net revenues     1 2  
Operating loss     (35) (35)  
Net loss     $ (35) $ (35)