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Exploration and Evaluation Assets, Net - Summary of Exploration and Valuation Assets, Net (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Exploration And Evaluation Assets [Line Items] |  |  |  |  |
Beginning Balance | $ 623 |  |  |  |
Exploration Expense | (18) | $ (91) | [1] | $ (82) | [1]
Ending Balance | 720 | 623 |  |  |
E&E Asset |  |  |  |  |
Disclosure Of Exploration And Evaluation Assets [Line Items] |  |  |  |  |
Beginning Balance | 623 | 787 |  |  |
Acquisitions (Note 5) | 45 |  |  |  |
Additions | 55 | 48 |  |  |
Transfers to PP&E (Note 18) |  | (47) |  |  |
Exploration Expense | (9) | (91) |  |  |
Depletion |  | (18) |  |  |
Change in Decommissioning Liabilities | 6 | 5 |  |  |
Divestitures (Note 9) |  | (61) |  |  |
Ending Balance | $ 720 | $ 623 |  | $ 787 |
[1] | See Note 3(w) for revisions to comparative results.

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- Definition Adjustments for depreciation and amortisation expense to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Depreciation and amortisation expense; Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 20 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_20_b&doctype=Standard -URIDate 2021-03-24 + 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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