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INTEREST EXPENSE (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about borrowings [line items]      
Other financing fees $ 4 $ 3 $ 6
Interest expense 428 392 367
Interest on corporate facility      
Disclosure of detailed information about borrowings [line items]      
Interest 12 12 5
Interest on corporate debt      
Disclosure of detailed information about borrowings [line items]      
Interest 51 39 22
Interest on non-recourse borrowings      
Disclosure of detailed information about borrowings [line items]      
Interest $ 361 $ 338 $ 334