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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Number of deferred share unit plans.

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Number of other equity instruments exercised or vested in share-based payment arrangement, settled for common shares

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Percentage of bonus award conversion to deferred share units.

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Performance Share Unit Plan, Vesting Multiplier, Percent

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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The intrinsic value of liabilities arising from share-based transactions for which the counterparty's right to cash or other assets had vested by the end of the period (for example, vested share appreciation rights). The intrinsic value is the difference between the fair value of the shares to which the counterparty has the (conditional or unconditional) right to subscribe, or which it has the right to receive, and the price (if any) that the counterparty is (or will be) required to pay for those shares. Share-based payment transactions are transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services, for which the counterparty's right to cash or other assets had vested by the end of the period (for example, vested share appreciation rights).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of liabilities arising from share-based payment transactions. Share-based payment transactions are transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services. [Refer: Share-based payment arrangements [member]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The weighted average fair value of share options granted during the period at the measurement date. [Refer: Weighted average [member]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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