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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Financial Instruments at Fair Value (Details) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |  |
Investments in publicly traded companies | $ 0 | $ 1,200 |
Investments in private companies | 118 | 53 |
Derivative financial assets | (538) | 1,136 | $ 895
Total financial assets | 769 | 2,803 |
Long-term debt | 40,855 | 31,733 | 18,688
Total financial liabilities | 42,044 | 32,147 |
Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | (571) | 988 |
Equity derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 48 | 54 | 36
Cash flow hedges | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | (470) | 916 | 1,110
Cash flow hedges | Interest rate derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets |  | 0 |
Cash flow hedges | Expenditure derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets |  | 94 | $ (19)
Fair value (Level 1) | Fair value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Investments in publicly traded companies | 0 | 1,200 |
Investments in private companies | 0 | 0 |
Total financial assets | 0 | 1,200 |
Long-term debt | 0 | 0 |
Total financial liabilities | 0 | 0 |
Fair value (Level 1) | 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 1) | Fair value | Equity derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 0 | 0 |
Fair value (Level 1) | 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 1) | 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 |
Fair value (Level 2) | Fair value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Investments in publicly traded companies | 0 | 0 |
Investments in private companies | 0 | 0 |
Total financial assets | 651 | 1,550 |
Long-term debt | 39,001 | 29,355 |
Total financial liabilities | 40,190 | 29,769 |
Fair value (Level 2) | Fair value | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 0 | 72 |
Derivative financial liabilities | 101 | 0 |
Fair value (Level 2) | Fair value | Equity derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 48 | 54 |
Fair value (Level 2) | Fair value | Cash flow hedges | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 599 | 1,330 |
Derivative financial liabilities | 1,069 | 414 |
Fair value (Level 2) | Fair value | Cash flow hedges | Expenditure derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 4 | 94 |
Derivative financial liabilities | 19 | 0 |
Fair value (Level 3) | Fair value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Investments in publicly traded companies | 0 | 0 |
Investments in private companies | 118 | 53 |
Total financial assets | 118 | 53 |
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 |
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 | 651 | 1,550 |
Before Offset Amount | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 0 | 72 |
Derivative financial liabilities | 101 | 0 |
Before Offset Amount | Equity derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 48 | 54 |
Before Offset Amount | Cash flow hedges | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 599 | 1,330 |
Derivative financial liabilities | 1,069 | 414 |
Before Offset Amount | Cash flow hedges | Interest rate derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets |  | 0 |
Before Offset Amount | Cash flow hedges | Expenditure derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 4 | 94 |
Derivative financial liabilities | $ 19 | $ 0 |

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