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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | $ 151 | $ (1) | $ 196 | $ 193
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 | 3 | 9 | 12
Cenovus Replacement Stock Options |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | 6 | (5) | (1) | 36
Performance Share Units |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | 98 | 1 | 125 | 66
Restricted Share Units |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | 35 | 4 | 56 | 65
Deferred Share Units |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Stock-Based Compensation Expense (Recovery) | $ 10 | $ (4) | $ 7 | $ 14

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