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Subsequent Events (Details) shares in Millions	Nov. 02, 2021 shares
Subsequent Events [Abstract]
Normal course issuer bid, maximum common shares (in shares)	146.5

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- Definition

Normal course issuer bid, maximum common shares

+ References

No definition available.

+ Details

Name:	cve_NormalCourseIssuerBidMaximumCommonShares
Namespace Prefix:	cve_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

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- Definition

Subsequent Events [Abstract]

+ References

No definition available.

+ Details

Name:	cve_SubsequentEventsAbstract
Namespace Prefix:	cve_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration