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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Financial Instruments at Fair Value (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |  |
Investments in private companies | $ 128 | $ 118 |
Derivative financial assets | 425 |  | $ 1,136
Total financial assets | 1,461 | 769 |
Long-term debt | 41,896 | 40,855 | 31,733
Total financial liabilities | 42,794 | 42,044 |
Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 5 |  | 72
Equity derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets |  | 48 | 54
Cash flow hedges | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 352 |  | 916
Cash flow hedges | Expenditure derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 132 |  | $ 94
Fair value (Level 2) | Fair value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Investments in private companies | 0 | 0 |
Total financial assets | 1,333 | 651 |
Long-term debt | 39,765 | 39,001 |
Total financial liabilities | 40,663 | 40,190 |
Fair value (Level 2) | Fair value | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 7 | 0 |
Derivative financial liabilities | 2 | 101 |
Fair value (Level 2) | Fair value | Equity derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 0 | 48 |
Derivative financial liabilities | 54 | 0 |
Fair value (Level 2) | Fair value | Cash flow hedges | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 1,194 | 599 |
Derivative financial liabilities | 842 | 1,069 |
Fair value (Level 2) | Fair value | Cash flow hedges | Expenditure derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 132 | 4 |
Derivative financial liabilities | 0 | 19 |
Fair value (Level 3) | Fair value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Investments in private companies | 128 | 118 |
Total financial assets | 128 | 118 |
Long-term debt | 0 | 0 |
Total financial liabilities | 0 | 0 |
Fair value (Level 3) | Fair value | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 0 | 0 |
Derivative financial liabilities | 0 | 0 |
Fair value (Level 3) | Fair value | Equity derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 0 | 0 |
Derivative financial liabilities |  |  |
Fair value (Level 3) | Fair value | Cash flow hedges | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 0 | 0 |
Derivative financial liabilities | 0 | 0 |
Fair value (Level 3) | Fair value | Cash flow hedges | Expenditure derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 0 | 0 |
Derivative financial liabilities | 0 | 0 |
Before Offset Amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 1,333 | 651 |
Before Offset Amount | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets |  | 0 |
Derivative financial liabilities | 2 | 101 |
Before Offset Amount | Equity derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 0 |  |
Derivative financial liabilities | 54 | 0 |
Before Offset Amount | Cash flow hedges | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities | 842 | 1,069 |
Before Offset Amount | Cash flow hedges | Expenditure derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities | $ 0 | $ 19 |

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