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LONG-TERM DEBT - Principal Repayments (Details) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of detailed information about borrowings [line items] |  |
Long-term debt | $ 16,751 | $ 15,967
Gross carrying amount |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term debt | 18,373 | $ 16,130
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 | 1,555 |
2023 |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term debt | 1,719 |
2024 |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term debt | 600 |
2025 |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term debt | 890 |
Thereafter |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term debt | $ 12,159 |

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