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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, 2023 | Dec. 31, 2022
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Total Stock-Based Compensation Expense (Recovery) | $ 97 | $ 373
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) | 11 | 15
Cenovus Replacement Stock Options |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Total Stock-Based Compensation Expense (Recovery) | (5) | 53
Performance Share Units |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Total Stock-Based Compensation Expense (Recovery) | 47 | 183
Restricted Share Units |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Total Stock-Based Compensation Expense (Recovery) | 46 | 100
Deferred Share Units |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Total Stock-Based Compensation Expense (Recovery) | $ (2) | $ 22

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