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Joint Arrangements and Associate - Joint Operations (Details)	9 Months Ended
	Sep. 30, 2021
BP-Husky Refining LLC
Disclosure of joint operations [line items]
Proportion of ownership interest in joint operation	50.00%
Sunrise Oil Sands Partnership
Disclosure of joint operations [line items]
Proportion of ownership interest in joint operation	50.00%
WRB Refining LP
Disclosure of joint operations [line items]
Proportion of ownership interest in joint operation	50.00%

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
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 2021-01-01
-Paragraph 21
-Subparagraph a
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_21_a_iv&doctype=Standard
-URIDate 2021-03-24

+ Details

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

X

- Details

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

X

- Details

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

X

- Details

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