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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Changes in Fair Value of Derivatives (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | $ 895 | $ 1,011
Proceeds received from settlement of derivatives | (12,376) | (5,127)
Payment on derivatives settled | 12,379 | 5,236
Increase (decrease) in fair value of derivatives | 238 | (225)
Derivative financial assets, end of year | 1,136 | 895
Debt derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 1,121 |
Derivative financial liabilities, beginning of year | 11 |
Proceeds received from settlement of derivatives | (10,029) | (3,914)
Payment on derivatives settled | 9,956 | 3,931
Increase (decrease) in fair value of derivatives | 134 | 6
Derivative financial assets, end of year | 988 | 1,121
Derivative financial liabilities, end of year | 72 | 11
Interest rate derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial liabilities, beginning of year | (243) |
Derivative financial liabilities, end of year | 0 | (243)
Equity derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 36 | 34
Proceeds received from settlement of derivatives | 0 | (3)
Payment on derivatives settled | 0 | 0
Increase (decrease) in fair value of derivatives | 18 | 5
Derivative financial assets, end of year | 54 | 36
Cash flow hedges | Debt derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 1,110 | 1,098
Proceeds received from settlement of derivatives | (987) | 0
Payment on derivatives settled | 1,019 | 0
Increase (decrease) in fair value of derivatives | (226) | 12
Derivative financial assets, end of year | 916 | 1,110
Cash flow hedges | Interest rate derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial liabilities, beginning of year | (243) | 0
Proceeds received from settlement of derivatives | (112) | (9)
Payment on derivatives settled | 165 | 0
Increase (decrease) in fair value of derivatives | 190 | (234)
Derivative financial liabilities, end of year | 0 | (243)
Cash flow hedges | Expenditure derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | (19) | (109)
Derivative financial liabilities, beginning of year | 19 |
Proceeds received from settlement of derivatives | (1,248) | (1,201)
Payment on derivatives settled | 1,239 | 1,305
Increase (decrease) in fair value of derivatives | 122 | (14)
Derivative financial assets, end of year |  | (19)
Derivative financial liabilities, end of year | 94 | 19
Before Offset Amount |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 1,551 |
Derivative financial liabilities, beginning of year | (656) |
Derivative financial assets, end of year | 1,550 | 1,551
Derivative financial liabilities, end of year | (414) | (656)
Before Offset Amount | Debt derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 11 | (12)
Derivative financial liabilities, beginning of year | 0 |
Derivative financial assets, end of year | (72) | 11
Derivative financial liabilities, end of year | 0 | 0
Before Offset Amount | Interest rate derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
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 | 36 |
Derivative financial liabilities, beginning of year | 0 |
Derivative financial assets, end of year | 54 | 36
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 | 1,453 |
Derivative financial liabilities, beginning of year | (343) |
Derivative financial assets, end of year | 1,330 | 1,453
Derivative financial liabilities, end of year | (414) | (343)
Before Offset Amount | Cash flow hedges | Interest rate derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 40 |
Derivative financial liabilities, beginning of year | (283) |
Derivative financial assets, end of year | 0 | 40
Derivative financial liabilities, end of year |  | (283)
Before Offset Amount | Cash flow hedges | Expenditure derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 11 |
Derivative financial liabilities, beginning of year | (30) |
Derivative financial assets, end of year | 94 | 11
Derivative financial liabilities, end of year | $ 0 | $ (30)

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