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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Disclosure of detailed information about financial instruments [line items] |  |  |  |
(Gain) Loss on Risk Management | $ 72 | $ (28) | $ 89 | $ 1,540
Realized (Gain) Loss |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
(Gain) Loss on Risk Management | 0 | (10) | 1 | 1,628
Unrealized (Gain) Loss on Risk Management |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
(Gain) Loss on Risk Management | $ 72 | $ (18) | $ 88 | $ (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 2023-01-01 -Paragraph 85 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_85&doctype=Standard -URIDate 2023-03-23 + Details
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