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v3.20.4

Other Assets - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2020
Intangible Asset [Member] |
Other Assets [Line Items] |
Cost amortized over the life of contract | 10 years

X
- Definition Cost amortized during the term of contract. + References No definition available. + Details
Name: | cve_CostAmortizedDuringTheTermOfContract
Namespace Prefix: | cve_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Other assets. + References No definition available. + Details
Name: | cve_OtherAssetsLineItems
Namespace Prefix: | cve_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_IntangibleAssetsWithIndefiniteUsefulLifeAxis=cve_IntangibleAssetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |