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Stock-Based Compensation Plans - Summary of Stock-Based Compensation (Detail) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | $ (12) | $ 151 | $ 123 | $ 196
Stock Options With Associated Net Settlement Rights |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | 2 | 2 | 9 | 9
Cenovus Replacement Stock Options |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | (2) | 6 | 1 | (1)
Performance Share Units |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | (4) | 98 | 57 | 125
Restricted Share Units |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | (2) | 35 | 50 | 56
Deferred Share Units |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | $ (6) | $ 10 | $ 6 | $ 7

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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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