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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Balance Sheet Classification (Details) - CAD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of detailed information about financial instruments [line items] |  |  |
Current asset | $ 120 | $ 61 |
Long-term asset | 1,431 | 1,378 |
Derivative financial assets | 895 | 1,011 | $ 1,439
Long-term liability | (189) | (318) |
Before Offset Amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Current asset | 120 | 61 |
Long-term asset | 1,431 | 1,378 |
Derivative financial assets | 1,551 | 1,439 |
Current liability | (467) | (110) |
Long-term liability | (189) | (318) |
Derivative financial liabilities | $ (656) | $ (428) |

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