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Stock-Based Compensation Plans - Summary of Stock-Based Compensation (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Total Stock-Based Compensation Expense (Recovery) | $ 126 | $ 97
Stock Options With Associated Net Settlement Rights |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Total Stock-Based Compensation Expense (Recovery) | 12 | 11
Cenovus Replacement Stock Options |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Total Stock-Based Compensation Expense (Recovery) | 1 | (5)
Performance Share Units |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Total Stock-Based Compensation Expense (Recovery) | 48 | 47
Restricted Share Units |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Total Stock-Based Compensation Expense (Recovery) | 60 | 46
Deferred Share Units |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Total Stock-Based Compensation Expense (Recovery) | $ 5 | $ (2)

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of expense from share-based payment transactions with employees. [Refer: Expense from share-based payment transactions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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