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INTEREST EXPENSE (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]      
Interest expense $ 555 $ 428 $ 392
Other financing fees 12 4 3
Interest on corporate facility      
Disclosure of detailed information about borrowings [line items]      
Interest 4 12 12
Interest on corporate debt      
Disclosure of detailed information about borrowings [line items]      
Interest 56 51 39
Interest on non-recourse borrowings      
Disclosure of detailed information about borrowings [line items]      
Interest $ 483 $ 361 $ 338