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v3.20.4

Risk Management - Net Fair Value of Risk Management Positions (Parenthetical) (Detail) - Fair value derivative financial instruments [Member] | 12 Months Ended
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Dec. 31, 2020
Bottom of Range [Member] |
Disclosure of Derivative Financial Instruments [Line Items] |
Average contract financial term | 1 month
Top of Range [Member] |
Disclosure of Derivative Financial Instruments [Line Items] |
Average contract financial term | 23 months

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- Definition Average contract financial term. + References No definition available. + Details
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Namespace Prefix: | cve_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Disclosure of derivative financial instruments. + References No definition available. + Details
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Namespace Prefix: | cve_
Data Type: | xbrli:stringItemType
Balance Type: | na
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_TypesOfFinancialInstrumentsAxis=cve_FairValueDerivativeFinancialInstrumentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |