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Critical Accounting Judgments, Key Sources of Estimation Uncertainty and Recent Development - Additional Information (Detail) - JointOperation | 12 Months Ended
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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%

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- 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

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- 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

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- 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

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