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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, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | $ 77 | $ (12) | $ 117 | $ 123
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 | 8 | 9
Cenovus Replacement Stock Options |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | 0 | (2) | (1) | 1
Performance Share Units |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | 24 | (4) | 39 | 57
Restricted Share Units |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | 40 | (2) | 61 | 50
Deferred Share Units |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | $ 11 | $ (6) | $ 10 | $ 6

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