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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Changes in Fair Value of Derivatives (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year |  | $ 1,136
Derivative financial liabilities, beginning of year | $ (538) |
Proceeds received from settlement of derivatives | (27,690) | (54,141)
Payment on derivatives settled | 27,534 | 53,831
(Decrease) increase in fair value of derivatives | 1,119 | (1,364)
Derivative financial assets, end of year | 425 |
Derivative financial liabilities, end of year |  | (538)
Debt derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year |  | 72
Derivative financial liabilities, beginning of year | (101) |
Proceeds received from settlement of derivatives | (25,846) | (49,612)
Payment on derivatives settled | 25,746 | 49,642
(Decrease) increase in fair value of derivatives | 206 | (203)
Derivative financial assets, end of year | 5 |
Derivative financial liabilities, end of year |  | (101)
Equity derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 48 | 54
Proceeds received from settlement of derivatives | 0 | 0
Payment on derivatives settled | 0 | 0
(Decrease) increase in fair value of derivatives | (102) | (6)
Derivative financial assets, end of year |  | 48
Derivative financial liabilities, end of year | (54) |
Purchase Agreements |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial liabilities, beginning of year | 0 |
Proceeds received from settlement of derivatives | (1) |
Payment on derivatives settled | 2 |
(Decrease) increase in fair value of derivatives | (11) |
Derivative financial liabilities, end of year | (10) | 0
Cash flow hedges | Debt derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year |  | 916
Derivative financial liabilities, beginning of year | (470) |
Proceeds received from settlement of derivatives | (203) | (3,232)
Payment on derivatives settled | 196 | 2,710
(Decrease) increase in fair value of derivatives | 829 | (864)
Derivative financial assets, end of year | 352 |
Derivative financial liabilities, end of year |  | (470)
Cash flow hedges | Expenditure derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year |  | 94
Derivative financial liabilities, beginning of year | (15) |
Proceeds received from settlement of derivatives | (1,640) | (1,297)
Payment on derivatives settled | 1,590 | 1,479
(Decrease) increase in fair value of derivatives | 197 | (291)
Derivative financial assets, end of year | 132 |
Derivative financial liabilities, end of year |  | (15)
Before Offset Amount |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 651 |
Derivative financial liabilities, beginning of year | (1,189) |
Derivative financial assets, end of year | 1,333 | 651
Derivative financial liabilities, end of year | (908) | (1,189)
Before Offset Amount | Debt derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 0 |
Derivative financial assets, end of year |  | 0
Before Offset Amount | Equity derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial liabilities, beginning of year | 0 |
Derivative financial assets, end of year | 0 |
Derivative financial liabilities, end of year |  | $ 0
Before Offset Amount | Purchase Agreements |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, end of year | 0 |
Before Offset Amount | Cash flow hedges | Expenditure derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial liabilities, end of year | $ 0 |

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