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Exploration and Evaluation Assets - Summary of Exploration and Valuation Assets (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Exploration And Evaluation Assets [Line Items] |  |  |  |
Beginning Balance |  | $ 787 |  |
Exploration Expense |  | (91) | $ (82) | $ (2,123)
Ending Balance |  | 623 | 787 |
E&E Assets [Member] |  |  |  |
Disclosure Of Exploration And Evaluation Assets [Line Items] |  |  |  |
Beginning Balance |  | 787 | 785 |
Additions |  | 48 | 73 |
Transfers to PP&E (Note 18) (1) | [1] | (47) |  |
Exploration Expense |  | (91) | (82) |
Depletion |  | (18) |  |
Change in Decommissioning Liabilities |  | 5 | 9 |
Exchange Rate Movements and Other |  |  | 2 |
Divestitures (Note 8) |  | (61) |  |
Ending Balance |  | $ 623 | $ 787 | $ 785
[1] | (1)Includes the $41 million reclassification of the GORR retained in the sale of the Marten Hills assets (see Note 8).

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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 2020-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=6&code=ifrs-tx-2020-en-r&anchor=para_24_b&doctype=Standard -URIDate 2020-01-01 + Details
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