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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, 2021 | Dec. 31, 2020
Disclosure of detailed information about financial instruments [abstract] |  |
Fair Value of Contracts, Beginning of Year | $ (53) | $ 3
Acquisition (Note 5A) | (14) | 0
Fair Value of Contracts Realized During the Year | 993 | 252
Change in Fair Value of Contracts in Place at Beginning of Year and Contracts Entered Into During the Year | (995) | (308)
Unrealized Foreign Exchange Gain (Loss) on U.S. Dollar Contracts | 1 | 0
Fair Value of Contracts, End of Year | $ (68) | $ (53)

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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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- 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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