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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, 2023 | Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | $ 1,136 | $ 895
Proceeds received from settlement of derivatives | (54,141) | (12,376)
Payment on derivatives settled | 53,831 | 12,379
(Decrease) increase in fair value of derivatives | (1,364) | 238
Derivative financial assets, end of year | (538) | 1,136
Debt derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 988 |
Derivative financial liabilities, beginning of year | 72 |
Proceeds received from settlement of derivatives | (49,612) | (10,029)
Payment on derivatives settled | 49,642 | 9,956
(Decrease) increase in fair value of derivatives | (203) | 134
Derivative financial assets, end of year | (571) | 988
Derivative financial liabilities, end of year | (101) | 72
Interest rate derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial liabilities, beginning of year | 0 |
Derivative financial liabilities, end of year |  | 0
Equity derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 54 | 36
Proceeds received from settlement of derivatives | 0 | 0
Payment on derivatives settled | 0 | 0
(Decrease) increase in fair value of derivatives | (6) | 18
Derivative financial assets, end of year | 48 | 54
Cash flow hedges | Debt derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 916 | 1,110
Proceeds received from settlement of derivatives | (3,232) | (987)
Payment on derivatives settled | 2,710 | 1,019
(Decrease) increase in fair value of derivatives | (864) | (226)
Derivative financial assets, end of year | (470) | 916
Cash flow hedges | Interest rate derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 0 |
Proceeds received from settlement of derivatives |  | (112)
Payment on derivatives settled |  | 165
(Decrease) increase in fair value of derivatives |  | 190
Derivative financial assets, end of year |  | 0
Cash flow hedges | Expenditure derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 94 | (19)
Derivative financial liabilities, beginning of year | (94) |
Proceeds received from settlement of derivatives | (1,297) | (1,248)
Payment on derivatives settled | 1,479 | 1,239
(Decrease) increase in fair value of derivatives | (291) | 122
Derivative financial assets, end of year |  | 94
Derivative financial liabilities, end of year | (15) | (94)
Before Offset Amount |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 1,550 |
Derivative financial liabilities, beginning of year | (414) |
Derivative financial assets, end of year | 651 | 1,550
Derivative financial liabilities, end of year | (1,189) | (414)
Before Offset Amount | Debt derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 72 |
Derivative financial liabilities, beginning of year | 0 | (11)
Derivative financial assets, end of year | 0 | 72
Derivative financial liabilities, end of year | (101) | 0
Before Offset Amount | Interest rate derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial liabilities, beginning of year | 0 |
Derivative financial liabilities, end of year |  | 0
Before Offset Amount | Equity derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 54 |
Derivative financial liabilities, beginning of year | 0 |
Derivative financial assets, end of year | 48 | 54
Derivative financial liabilities, end of year | 0 | 0
Before Offset Amount | Cash flow hedges | Debt derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 1,330 |
Derivative financial liabilities, beginning of year | (414) |
Derivative financial assets, end of year | 599 | 1,330
Derivative financial liabilities, end of year | (1,069) | (414)
Before Offset Amount | Cash flow hedges | Interest rate derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 0 |
Derivative financial liabilities, beginning of year | (243) |
Derivative financial assets, end of year |  | 0
Derivative financial liabilities, end of year |  | (243)
Before Offset Amount | 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 | 0 |
Derivative financial assets, end of year | 4 | 94
Derivative financial liabilities, end of year | $ (19) | $ 0

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