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INTEREST EXPENSE (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]      
Other financing fees $ 140 $ 83 $ 12
Interest expense 1,179 904 555
Interest on corporate facility      
Disclosure of detailed information about borrowings [line items]      
Interest 19 20 4
Interest on corporate debt      
Disclosure of detailed information about borrowings [line items]      
Interest 76 63 56
Interest on non-recourse borrowings      
Disclosure of detailed information about borrowings [line items]      
Interest $ 944 $ 738 $ 483