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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

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