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Exploration and Evaluation Assets, Net - Summary of Exploration and Valuation Assets, Net (Detail) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Exploration And Evaluation Assets [Line Items] |  |  |  |  |  |  |
Beginning Balance |  |  | $ 623 |  |  |  |
Expense arising from exploration for and evaluation of mineral resources | $ (5) | $ (25) | (15) | $ (32) | $ (91) | $ (82) | $ (2,123)
Ending Balance | 655 |  | 655 |  | 623 |  |
E&E Assets [Member] |  |  |  |  |  |  |
Disclosure Of Exploration And Evaluation Assets [Line Items] |  |  |  |  |  |  |
Beginning Balance |  |  | 623 |  |  |  |
Additions |  |  | 37 |  |  |  |
Expense arising from exploration for and evaluation of mineral resources |  |  | (12) |  |  |  |
Change in Decommissioning Liabilities |  |  | 8 |  |  |  |
Exchange Rate Movements and Other |  |  | (1) |  |  |  |
Ending Balance | $ 655 |  | $ 655 |  | $ 623 |  |

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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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