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INTEREST EXPENSE (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]      
Other financing fees $ 83 $ 12 $ 4
Interest expense 904 555 428
Interest on corporate facility      
Disclosure of detailed information about borrowings [line items]      
Interest 20 4 12
Interest on corporate debt      
Disclosure of detailed information about borrowings [line items]      
Interest 63 56 51
Interest on non-recourse borrowings      
Disclosure of detailed information about borrowings [line items]      
Interest $ 738 $ 483 $ 361