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Financial Instruments - Summary of Earnings Impact of (Gain) Loss from Risk Management Positions (Detail) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Disclosure of detailed information about financial instruments [line items] |  |  |  |
(Gain) Loss on Risk Management | $ (20) | $ 72 | $ 42 | $ 89
Realized (Gain) Loss |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
(Gain) Loss on Risk Management | (27) | 0 | 11 | 1
Unrealized (Gain) Loss on Risk Management |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
(Gain) Loss on Risk Management | $ 7 | $ 72 | $ 31 | $ 88

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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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