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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

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