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Decommissioning Liabilities - Summary of Changes to the Credit-Adjusted Risk-Free Rate or the Inflation Rate Impact on the Decommissioning Liabilities (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
One percent increase [member] |  |
Disclosure Of Other Provisions [Line Items] |  |
Credit-Adjusted Risk-Free Rate | $ (228) | $ (236)
Inflation Rate | 321 | 340
One percent decrease [member] |  |
Disclosure Of Other Provisions [Line Items] |  |
Credit-Adjusted Risk-Free Rate | 313 | 332
Inflation Rate | $ (235) | $ (243)

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- Definition Theoretical impact to decommissioning liability from increase/decrease in credit -adjusted risk free rate + 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 Theoretical impact to decommissioning liability from increase/decrease in inflation rate + 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 Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | cve_CreditAdjustedRiskFreeRateAndInflationRateAxis=cve_OnePercentDecreaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |