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Foreign Exchange (Gain) Loss, Net - Schedule of Foreign Exchange Gain Loss Net (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items] |  |
Unrealized Foreign Exchange (Gain) Loss | $ 550 | $ (210)
Realized Foreign Exchange (Gain) Loss | (88) | 143
Total | 462 | (67)
U.S. Dollar Debt Issued From Canada |  |
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items] |  |
Unrealized Foreign Exchange (Gain) Loss | 442 | (231)
Other |  |
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items] |  |
Unrealized Foreign Exchange (Gain) Loss | $ 108 | $ 21

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- Definition The amount of exchange differences recognised in profit or loss that arise from foreign currency transactions, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9. [Refer: At fair value [member]; Classes of financial instruments [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 21 -IssueDate 2024-01-01 -Paragraph 52 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=21&code=ifrs-tx-2024-en-r&anchor=para_52_a&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 35 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_35&doctype=Standard -URIDate 2024-03-27 + Details
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