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v3.22.4

Exploration and Evaluation Assets, Net - Summary of Exploration and Valuation Assets, Net (Detail) - CAD ($) $ in Millions | 8 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure Of Exploration And Evaluation Assets [Line Items] |  |  |  |  |  |
Beginning Balance | $ 720 | $ 720 |  |  |  |
Write-downs |  | (101) | $ (18) | [1] | $ (91) | [1]
Ending Balance |  | 685 | 720 |  |  |
Sunrise Oil Sands Partnership |  |  |  |  |  |
Disclosure Of Exploration And Evaluation Assets [Line Items] |  |  |  |  |  |
Carrying Value Of Investment In Joint Ventures Prior To Acquisition​ Date | 0 |  |  |  |  |
Gain (loss) recognised as result of remeasuring to fair value equity interest in acquiree held by acquirer before business combination | 40 |  |  |  |  |
Oil Sands |  |  |  |  |  |
Disclosure Of Exploration And Evaluation Assets [Line Items] |  |  |  |  |  |
Beginning Balance | 653 | 653 |  |  |  |
Ending Balance |  | 674 | 653 |  |  |
Offshore |  |  |  |  |  |
Disclosure Of Exploration And Evaluation Assets [Line Items] |  |  |  |  |  |
Beginning Balance | 61 | 61 |  |  |  |
Ending Balance |  | 5 | 61 |  |  |
E&E Asset |  |  |  |  |  |
Disclosure Of Exploration And Evaluation Assets [Line Items] |  |  |  |  |  |
Beginning Balance | $ 720 | 720 | 623 |  |  |
Acquisitions (Note 5) |  |  | 45 |  |  |
Additions |  | 37 | 55 |  |  |
Write-downs |  | (64) | (9) |  |  |
Change in Decommissioning Liabilities |  | (12) | 6 |  |  |
Exchange Rate Movements and Other |  | 4 |  |  |  |
Ending Balance |  | 685 | 720 |  | $ 623 |
E&E Asset | Oil Sands |  |  |  |  |  |
Disclosure Of Exploration And Evaluation Assets [Line Items] |  |  |  |  |  |
Exploration and evaluation costs previously capitalized, written off |  | 2 | $ 9 |  |  |
E&E Asset | Offshore |  |  |  |  |  |
Disclosure Of Exploration And Evaluation Assets [Line Items] |  |  |  |  |  |
Exploration and evaluation costs previously capitalized, written off |  | $ 62 |  |  |  |
[1] | See Note 3X for revisions to prior period results.

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- Definition The amount of expense arising from the search for mineral resources, including minerals, oil, natural gas and similar non-regenerative resources after the entity has obtained legal rights to explore in a specific area, as well as the determination of the technical feasibility and commercial viability of extracting the mineral resource. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 6 -IssueDate 2022-03-24 -Paragraph 24 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=6&code=ifrs-tx-2022-en-r&anchor=para_24_b&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount of exploration and evaluation assets recognised as intangible assets in accordance with the entity's accounting policy. [Refer: Exploration and evaluation assets [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 6 -IssueDate 2022-03-24 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=6&code=ifrs-tx-2022-en-r&anchor=para_25&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2022-03-24 -Paragraph 119 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2022-en-r&anchor=para_119&doctype=Standard -URIDate 2022-03-24 + Details
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