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Stock-Based Compensation Plans - Additional Information (Detail) | 12 Months Ended |
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Dec. 31, 2022 CAD ($) Plan shares plans $ / shares | Dec. 31, 2021 CAD ($)
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Number of deferred share unit plans | plans | 2 |
Liabilities from share based payment | $ 162,000,000 | $ 317,000,000
Net settlement rights |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Options expiration term | 7 years |
Weighted average unit fair value of granted | $ 19.94 |
Weighted average exercise price, exercised (in dollars per share) | $ / shares | $ 12.77 |
Number of units exercised (in shares) | shares | 11,599,000 |
Cenovus Replacement Stock Options |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Liabilities from share based payment | $ 42,000,000 | 30,000,000
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 | 103,000 |
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 | $ 14.98 |
Common shares issued in exercise of other equity instruments (in shares) | shares | 81,000 |
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 | 6,042,000 |
Weighted average exercise price, exercised (in dollars per share) | $ / shares | $ 16.57 |
PSUs |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Liabilities from share based payment | $ 216,000,000 | 61,000,000
Intrinsic value of vested | $ 0 |
RSUs |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Award vesting term | 3 years |
Liabilities from share based payment | $ 109,000,000 | 53,000,000
Intrinsic value of vested | $ 0 |
DSUs |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Award vesting term | 3 years |
Liabilities from share based payment | $ 40,000,000 | $ 20,000,000
DSUs | Bottom of range |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Number of deferred share unit plans | Plan | 0 |
DSUs | Top of range |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Number of deferred share unit plans | Plan | 2 |
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 | 5000.00% |
DSUs Option Four |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Percentage of annual bonus award to convert into DSUs | 7500.00% |
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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