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Assets Held for Sale and Discontinued Operations - Additional Information (Details) - CAD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 02, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Non-current Assets Held For Sale And Discontinued Operations [Line Items] |  |  |
Proceeds from sale of Fort Hills |  | $ 1,014 | $ 0
Asset impairment charges pre tax |  |  | 1,200
Asset impairment charges after tax |  |  | 961
Non-current assets held for sale (Note 5) |  | 0 | 173
Assets held for sale (Note 5) |  | 0 | 1,566
Fort Hill Cash Generating Unit |  |  |
Disclosure Of Non-current Assets Held For Sale And Discontinued Operations [Line Items] |  |  |
Proceeds from sale of Fort Hills |  | $ 1,000 |
Disposal group, including discontinued operation, liabilities | $ 269 |  |
Disposal group, including discontinued operation, liabilities, current | 26 |  |
Disposal group, including discontinued operation, liabilities, noncurrent | 243 |  |
Loss on sale of discontinued operations | $ 8 |  |
Mesaba Mineral Deposit |  |  |
Disclosure Of Non-current Assets Held For Sale And Discontinued Operations [Line Items] |  |  |
Non-current assets held for sale (Note 5) |  |  | 14
San Nicolas Copper-Zinc Development Project |  |  |
Disclosure Of Non-current Assets Held For Sale And Discontinued Operations [Line Items] |  |  |
Non-current assets held for sale (Note 5) |  |  | $ 159
Fort Hills Energy Limited Partnership |  |  |
Disclosure Of Non-current Assets Held For Sale And Discontinued Operations [Line Items] |  |  |
Proportion of ownership interest in joint operation | 21.30% |  |

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- Definition The amount of current assets other than non-current assets or disposal groups classified as held for sale or as held for distribution to owners. [Refer: Current assets; Disposal groups classified as held for sale [member]; Non-current assets or disposal groups classified as held for sale; Non-current assets or disposal groups classified as held for distribution to owners] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 66 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_66&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of non-current assets or disposal groups classified as held for sale or as held for distribution to owners. [Refer: Non-current assets or disposal groups classified as held for distribution to owners; Non-current assets or disposal groups classified as held for sale] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 54 -Subparagraph j -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_54_j&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The cash inflow from the disposal of mining assets. [Refer: Mining assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2023-01-01 -Paragraph 16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_16&doctype=Standard -URIDate 2023-03-23 + Details
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- Details
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