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Other Assets - Additional Information (Detail)	12 Months Ended
	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: