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Exploration and Evaluation Assets, Net - Summary of Exploration and Valuation Assets, Net (Detail) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | [1] | Jun. 30, 2022 | Jun. 30, 2021 | [1]
Disclosure Of Exploration And Evaluation Assets [Line Items] |  |  |  |
Beginning Balance |  |  | $ 720 |
Exploration Expense | $ (10) | $ (4) | (26) | $ (10)
Ending Balance | 725 |  | 725 |
E&E Assets |  |  |  |
Disclosure Of Exploration And Evaluation Assets [Line Items] |  |  |  |
Beginning Balance |  |  | 720 |
Additions |  |  | 13 |
Change in Decommissioning Liabilities |  |  | (12) |
Exchange Rate Movements and Other |  |  | 4 |
Ending Balance | $ 725 |  | $ 725 |
[1] | See Note 3 for revisions to prior period results.

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- Definition Increase decrease in exploration and evaluation assets from changes in provision for decommissioning restoration and rehabilitation costs. + References No definition available. + Details
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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 2021-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=6&code=ifrs-tx-2021-en-r&anchor=para_24_b&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=6&code=ifrs-tx-2021-en-r&anchor=para_25&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2021-01-01 -Paragraph 119 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2021-en-r&anchor=para_119&doctype=Standard -URIDate 2021-03-24 + Details
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