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Critical Accounting Judgments, Key Sources of Estimation Uncertainty and Recent Development - Additional Information (Detail) - JointOperation	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Joint Operations [Line Items]
Number of joint operations	2
WRB [Member]
Disclosure Of Joint Operations [Line Items]
Percent of ownership in joint operations	50.00%	50.00%

X

- Definition

Number of joint operations partnerships.

+ References

No definition available.

+ Details

Name:	cve_NumberOfJointOperationsPartnerships
Namespace Prefix:	cve_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfJointOperationsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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

+ Details

Name:	ifrs-full_ProportionOfOwnershipInterestInJointOperation
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_JointOperationsAxis=cve_WRBRefiningLPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: