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BORROWINGS - Non-Recourse Borrowings (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Disclosure of detailed information about borrowings [line items] |  |
Current Non-recourse Borrowings And Current Portion of Non-current Non-recourse Borrowings | $ 226 | $ 364
Non-current Portion Of Non-current Non-recourse Borrowings | 9,463 | 7,699
Non-recourse borrowings |  |
Disclosure of detailed information about borrowings [line items] |  |
Total | $ 9,689 | $ 8,063

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