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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Balance Sheet Classification (Details) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of detailed information about financial instruments [line items] |  |  |
Current asset | $ 61 | $ 101 |
Long-term asset | 1,378 | 1,478 |
Derivative financial assets | 1,011 | 1,439 | $ 1,500
Long-term liability | (318) | (90) |
Before Offset Amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Current asset | 61 | 101 |
Long-term asset | 1,378 | 1,478 |
Derivative financial assets | 1,439 | 1,579 |
Current liability | (110) | (50) |
Long-term liability | (318) | (90) |
Derivative financial liabilities | $ (428) | $ (140) |

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