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Financial Instruments - Summary of Earnings Impact of (Gain) Loss from Risk Management Positions (Detail) - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
(Gain) Loss on Risk Management |  | $ 1,636 | $ 995 | [1] | $ 308 | [1]
Net realized loss on crude oil contracts | $ 467 |  |  |  |  |
Realized (Gain) Loss |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
(Gain) Loss on Risk Management |  | 1,762 | 993 |  | 252 |
Unrealized (Gain) Loss |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
(Gain) Loss on Risk Management |  | $ (126) | $ 2 |  | $ 56 |
[1] | See Note 3X for revisions to prior period results.

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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 2022-03-24 -Paragraph 85 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_85&doctype=Standard -URIDate 2022-03-24 + Details
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