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BORROWINGS - Non-Recourse Borrowings (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]    
Total $ 10,164 $ 8,326
Non-recourse borrowings    
Disclosure of detailed information about borrowings [line items]    
Current 364 279
Non-current 7,699 7,045
Total $ 8,063 $ 7,324