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Stock-Based Compensation Plans - Additional Information (Detail) $ / shares in Units, shares in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 CAD ($) plan $ / shares shares | Dec. 31, 2022 CAD ($)
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Options expiration term | 7 years |
Liabilities from share based payment | $ 284,000,000 | $ 162,000,000
Number of deferred share unit plans | plan | 2 |
Minimum |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Vesting multiplier, percent | 0.00% |
Maximum |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Vesting multiplier, percent | 200.00% |
Net settlement rights |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Weighted average unit fair value of granted | $ 7.41 |
Cenovus Replacement Stock Options |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Liabilities from share based payment | $ 12,000,000 | 42,000,000
Cenovus Replacement Stock Options | Settled for cash |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Number of other equity instruments exercised or vested in share-based payment arrangement, settled for cash | shares | (2,113) |
Weighted average exercise price, exercised (in dollars per share) | $ / shares | $ 9.98 |
Cenovus Replacement Stock Options | Settled for common shares |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Number of other equity instruments exercised or vested in share-based payment arrangement, settled for common shares (in shares) | shares | 3 |
Weighted average exercise price of other equity instruments exercised or vested in share-based payment arrangement, settled for common shares (in dollars per share) | $ / shares | $ 3.54 |
Common shares issued in exercise of other equity instruments (in shares) | shares | 2 |
PSUs |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Liabilities from share based payment | $ 238,000,000 | 216,000,000
Award vesting term | 3 years |
Intrinsic value of vested | $ 0 |
RSUs |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Liabilities from share based payment | $ 97,000,000 | 109,000,000
Award vesting term | 3 years |
Intrinsic value of vested | $ 0 |
DSUs |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Liabilities from share based payment | $ 37,000,000 | $ 40,000,000
DSUs Option One |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Percentage of annual bonus award to convert into DSUs | 0.00% |
DSUs Option Two |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Percentage of annual bonus award to convert into DSUs | 25.00% |
DSUs Option Three |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Percentage of annual bonus award to convert into DSUs | 50.00% |
DSUs Option Four |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Percentage of annual bonus award to convert into DSUs | 75.00% |
Deferred Share Units Option Five |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Percentage of annual bonus award to convert into DSUs | 100.00% |
Later than one year |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Percentage of options exercisable | 30.00% |
3 Years |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Percentage of options exercisable | 30.00% |

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