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Commitments and Contingencies - Summary of Future Payments of Commitments (Parenthetical) (Detail) - CAD ($) $ in Billions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of commitments [Line Items]
Transportation Commitment	$ 14	$ 13
Transportation Commitment Term	20 years	20 years
WRB [Member]
Disclosure of commitments [Line Items]
Percent of ownership in joint operations	50.00%	50.00%

X

- Definition

Disclosure of commitments line items.

+ References

No definition available.

+ Details

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

X

- Definition

Transportation commitments subject to regulatory approval or approved but not yet in service.

+ References

No definition available.

+ Details

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Namespace Prefix:	cve_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Transportation commitments subject to regulatory approval or approved but not yet in service term.

+ References

No definition available.

+ Details

Name:	cve_TransportationCommitmentsSubjectToRegulatoryApprovalOrApprovedButNotYetInServiceTerm
Namespace Prefix:	cve_
Data Type:	xbrli:durationItemType
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X

- Definition

The proportion of ownership interest in a joint operation attributable to the entity. [Refer: Joint operations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2020-01-01
-Paragraph 21
-Subparagraph a
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_21_a_iv&doctype=Standard
-URIDate 2020-01-01

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- Details

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Namespace Prefix:
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