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financial instruments - Derivative gains and losses (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Currency risk |  |
Disclosure of detailed information about financial instruments |  |
Amount of gain (loss) recognized in other comprehensive income (effective portion) | $ 355 | $ (261)
Gain (loss) reclassified from other comprehensive income to income (effective portion) | (501) | 84
Derivative assets |  |
Disclosure of detailed information about financial instruments |  |
Amount of gain (loss) recognized in other comprehensive income (effective portion) | 361 | (264)
Gain (loss) reclassified from other comprehensive income to income (effective portion) | 505 | (88)
Derivative assets | Currency risk |  |
Disclosure of detailed information about financial instruments |  |
Amount of gain (loss) recognized in other comprehensive income (effective portion) | 355 | (261)
Gain (loss) reclassified from other comprehensive income to income (effective portion) | 501 | (84)
Derivatives held for hedging | Currency risk related to purchases | U.S. Dollars | Goods and services purchased |  |
Disclosure of detailed information about financial instruments |  |
Amount of gain (loss) recognized in other comprehensive income (effective portion) | 34 | (7)
Gain (loss) reclassified from other comprehensive income to income (effective portion) | 9 | 17
Derivatives held for hedging | Currency risk related to long-term debt | U.S. Dollars | Financing costs |  |
Disclosure of detailed information about financial instruments |  |
Amount of gain (loss) recognized in other comprehensive income (effective portion) | 266 | (222)
Gain (loss) reclassified from other comprehensive income to income (effective portion) | 470 | (108)
Spread included in fair value of derivative instruments | (185) | 40
Derivatives held for hedging | Currency risk related to investment in a foreign operation | Financing costs |  |
Disclosure of detailed information about financial instruments |  |
Amount of gain (loss) recognized in other comprehensive income (effective portion) | 55 | (32)
Gain (loss) reclassified from other comprehensive income to income (effective portion) | 22 | 7
Derivatives held for hedging | Currency risk related to investment in a foreign operation | U.S. Dollars | Financing costs |  |
Disclosure of detailed information about financial instruments |  |
Spread included in fair value of derivative instruments | (1) | 2
Derivatives held for hedging | Other market risk | Financing costs |  |
Disclosure of detailed information about financial instruments |  |
Amount of gain (loss) recognized in other comprehensive income (effective portion) | 6 | (3)
Gain (loss) reclassified from other comprehensive income to income (effective portion) | 4 | (4)
Derivatives held for trading | Currency risk | Financing costs |  |
Disclosure of detailed information about financial instruments |  |
Gain (loss) on derivatives recognized in income | (6) | 5
Unrealized changes in virtual power purchase agreements forward element | Financing costs |  |
Disclosure of detailed information about financial instruments |  |
Gain (loss) on derivatives recognized in income | (231) |
Cash flow hedging item (HFH) | Derivative assets | Currency risk related to long-term debt | U.S. Dollars |  |
Disclosure of detailed information about financial instruments |  |
Spread included in fair value of derivative instruments | (22) | 163
Cash flow hedging item (HFH) | Derivative assets | Currency risk related to long-term debt | European euro |  |
Disclosure of detailed information about financial instruments |  |
Spread included in fair value of derivative instruments | 2 | 3
Cash flow hedging item (HFH) | Derivatives held for hedging |  |
Disclosure of detailed information about financial instruments |  |
Ineffective portion of derivative instruments classified as cash flow hedging items | $ 0 | $ 0

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- Definition The gain (loss) recognised in profit or loss on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24C_a_i&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24C -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24C_b_ii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The gains (losses) recognised in other comprehensive income on cash flow hedges, before tax, before reclassification adjustments. [Refer: Cash flow hedges [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 91 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_91_b&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The gains (losses) on financial assets at fair value through profit or loss classified as held for trading. [Refer: Financial assets at fair value through profit or loss, classified as held for trading; Gains (losses) on financial assets at fair value through profit or loss] + References No definition available. + Details
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