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BORROWINGS - Non-Recourse Borrowings (Details) $ in Millions, $ in Millions | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 10, 2018 CAD ($)
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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 | $ 1,028 | $ 985 |
Non-current Portion Of Non-current Non-recourse Borrowings | 13,172 | 12,128 |
Medium-term Notes, Maturing September 11, 2028 [Domain] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Notional amount |  |  | $ 500
Total | 382 | 365 |
Non-recourse borrowings |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total | $ 14,200 | $ 13,113 |
Debt Issuers | Medium-term Notes, Maturing September 11, 2028 [Domain] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Notional amount |  |  | $ 500

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