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Financial Instruments - Reconciliation of Changes in the Fair Value of Cenovus's Risk Management Assets and Liabilities (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of detailed information about financial instruments [abstract] |  |
Fair Value of Contracts, Beginning of Year | $ 12 | $ 46
Change in Fair Value of Contracts in Place at Beginning of Year | (20) | 0
Change in Fair Value of Contracts Entered Into During the Year | (30) | (45)
Fair Value of Contracts Realized During the Year | 46 | 9
Unrealized Foreign Exchange Gain (Loss) on U.S. Dollar Contracts | (1) | 2
Fair Value of Contracts, End of Year | $ 7 | $ 12

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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_
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Balance Type: | debit
Period Type: | duration

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- Definition Fair value of derivative financial instruments net. + References No definition available. + Details
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Namespace Prefix: | cve_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Gains Losses On Change In Fair Value of Contracts Entered During Year + References No definition available. + Details
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Namespace Prefix: | cve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Gains losses on change in fair value of contracts. + References No definition available. + Details
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Namespace Prefix: | cve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Settlements fair value measurement assets liabilities including discontinued operations. + References No definition available. + Details
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Namespace Prefix: | cve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- References No definition available. + Details
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