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Contingent Payment - Additional Information (Detail) $ in Millions		9 Months Ended	12 Months Ended
	May 17, 2021 CAD ($) $ / bbl	Sep. 30, 2021 CAD ($)	Dec. 31, 2020 CAD ($)
Disclosure of contingent liabilities in business combination [line items]
Contingent payable		$ 242
Conoco Phillips Company and certain of its subsidiaries
Disclosure of contingent liabilities in business combination [line items]
Contingent payments period	5 years
Average crude oil price | $ / bbl	52.00
Quarterly contingent payment	$ 6
Contingent payable		$ 119	$ 0

X

- Definition

Average crude oil price.

+ References

No definition available.

+ Details

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

X

- Definition

Contingent consideration payment period.

+ References

No definition available.

+ Details

Name:	cve_ContingentConsiderationPaymentPeriod
Namespace Prefix:	cve_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the quarterly contingent payment that will be required for each dollar in excess of specified average crude oil price per barrel based on acquisition agreement.

+ References

No definition available.

+ Details

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

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
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X

- Definition

The amount of contingent liabilities recognised in a business combination that were settled. [Refer: Contingent liabilities recognised in business combination]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2021-01-01
-Paragraph B67
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B67_c&doctype=Appendix&subtype=B
-URIDate 2021-03-24

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: