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Financial Instruments - Reconciliation of Changes in the Fair Value of Cenovus's Risk Management Assets and Liabilities (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2025 CAD ($)
Disclosure of detailed information about financial instruments [abstract]
As at December 31, 2024	$ 7
Change in Fair Value of Contracts in Place, Beginning of Year	57
Change in Fair Value of Contracts Entered Into During the Period	14
Fair Value of Contracts Realized During the Period	(14)
As at September 30, 2025	$ 64

X

- Definition

Fair Value Of Contracts Entered Into During Period

+ References

No definition available.

+ Details

Name:	cve_FairValueOfContractsEnteredIntoDuringPeriod
Namespace Prefix:	cve_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Fair value of derivative financial instruments net.

+ References

No definition available.

+ Details

Name:	cve_FairValueOfDerivativeFinancialInstrumentsNet
Namespace Prefix:	cve_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Gains losses on change in fair value of contracts.

+ References

No definition available.

+ Details

Name:	cve_GainsLossesOnChangeInFairValueOfContracts
Namespace Prefix:	cve_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Settlements fair value measurement assets liabilities including discontinued operations.

+ References

No definition available.

+ Details

Name:	cve_SettlementsFairValueMeasurementAssetsLiabilitiesIncludingDiscontinuedOperations
Namespace Prefix:	cve_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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