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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, 2021 CAD ($)
Disclosure of detailed information about financial instruments [abstract] |
Fair Value of Contracts, Beginning of Year | $ (53)
Acquisition | (14)
Fair Value of Contracts Realized During the Period | 725
Change in Fair Value of Contracts in Place at Beginning of Year and Contracts Entered Into During the Period | (951)
Unrealized Foreign Exchange Gain (Loss) on U.S. Dollar Contracts | 1
Fair Value of Contracts, End of Period | $ (292)

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- Definition Acquisitions, Fair Value Of Derivative Financial Instruments + References No definition available. + Details
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- Definition Change in fair value of derivative financial instruments from foreign exchange. + References No definition available. + Details
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Namespace Prefix: | cve_
Data Type: | xbrli:monetaryItemType
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- Definition Fair value of derivative financial instruments net. + References No definition available. + Details
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Balance Type: | debit
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- Definition Gains losses on change in fair value of contracts. + References No definition available. + Details
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- Definition Settlements fair value measurement assets liabilities including discontinued operations. + References No definition available. + Details
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- References No definition available. + Details
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