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LONG-TERM DEBT - Principal Repayments (Details) - CAD CAD in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of detailed information about borrowings [line items] |  |
Long-term debt | CAD 12,692 | CAD 15,330
Gross carrying amount |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term debt | 14,555 | CAD 16,197
2019 |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term debt | 900 |
2020 |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term debt | 900 |
2021 |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term debt | 1,450 |
2022 |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term debt | CAD 600 |

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