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Contingent Payment - Summary of Contingent Payment (Detail) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Contingent Liabilities In Business Combination [Abstract]
Contingent Payment, Beginning of Year	$ 143	$ 132
Re-measurement	(80)	164
Liabilities Settled or Payable		(153)
Contingent Payment, End of Year	63	143
Less: Current Portion	36	79
Long-Term Portion	$ 27	$ 64

X

- Definition

Contingent payment current.

+ References

No definition available.

+ Details

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

X

- Definition

Contingent payment long-term.

+ References

No definition available.

+ Details

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

X

- Definition

Re-measurement of contingent payments.

+ References

No definition available.

+ Details

Name:	cve_ReMeasurementOfContingentPayments
Namespace Prefix:	cve_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of contingent liabilities recognised in a business combination. [Refer: Contingent liabilities [member]; Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2020-01-01
-Paragraph B67
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2020-en-r&anchor=para_B67_c&doctype=Appendix&subtype=B
-URIDate 2020-01-01

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
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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 2020-01-01
-Paragraph B67
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2020-en-r&anchor=para_B67_c&doctype=Appendix&subtype=B
-URIDate 2020-01-01

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Balance Type:	debit
Period Type:	duration