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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
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Sep. 30, 2023 CAD ($)
Disclosure of detailed information about financial instruments [abstract] |
As at December 31, 2022 | $ 46
Change in Fair Value of Contracts in Place, Beginning of Year | 1
Change in Fair Value of Contracts Entered Into During the Period | (76)
Fair Value of Contracts Realized During the Period | 1
Unrealized Foreign Exchange Gain (Loss) on U.S. Dollar Contracts | 1
As at September 30, 2023 | $ (27)

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- Definition Change in fair value of derivative financial instruments from foreign exchange. + References No definition available. + Details
Name: | cve_ChangeInFairValueOfDerivativeFinancialInstrumentsFromForeignExchange
Namespace Prefix: | cve_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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

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- 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

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- 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

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- 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

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- References No definition available. + Details
Name: | ifrs-full_DisclosureOfFinancialInstrumentsAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration