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Financial Instruments - Summary of Earnings Impact of (Gain) Loss from Risk Management Positions (Detail) - 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] |  |
(Gain) Loss on Risk Management | $ 58 | $ 61
Realized (Gain) Loss |  |
Disclosure of detailed information about financial instruments [line items] |  |
(Gain) Loss on Risk Management | 46 | 9
Unrealized (Gain) Loss |  |
Disclosure of detailed information about financial instruments [line items] |  |
(Gain) Loss on Risk Management | $ 12 | $ 52

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- Definition The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 85 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_85&doctype=Standard -URIDate 2024-03-27 + Details
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