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LONG-TERM DEBT - Schedule of Debt Repayments (Details) - CAD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Borrowings | $ 22,458 | $ 16,805
Gross carrying amount |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Borrowings | 22,597 | $ 16,870
Gross carrying amount | 2018 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Borrowings | 2,027 |
Gross carrying amount | 2019 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Borrowings | 4,228 |
Gross carrying amount | 2020 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Borrowings | 4,231 |
Gross carrying amount | 2021 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Borrowings | 760 |
Gross carrying amount | 2022 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Borrowings | 1,000 |
Gross carrying amount | Thereafter |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Borrowings | $ 10,351 |

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