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Financial Instruments - Summary of Changes in Inputs to Option Pricing Model, Resulted in Unrealized Gains (Losses) Impacting Earnings Before Income Tax (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2023 CAD ($) $ / bbl
Western Canadian Select Forward Pricing
Disclosure Of Sensitivity Of Fair Value Measurement To Changes In Unobservable Inputs Liabilities [Line Items]
Sensitivity price range | $ / bbl	10.00
West Texas Intermediate Option Volatility
Disclosure Of Sensitivity Of Fair Value Measurement To Changes In Unobservable Inputs Liabilities [Line Items]
Sensitivity range	10.00%
Foreign Exchange Volatility Rate
Disclosure Of Sensitivity Of Fair Value Measurement To Changes In Unobservable Inputs Liabilities [Line Items]
Increase in volatility	$ 0
Decrease in volatility	$ 0
Sensitivity range	5.00%

X

- Definition

Contingent liabilities sensitivity price range.

+ References

No definition available.

+ Details

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

X

- Definition

Contingent liabilities sensitivity range.

+ References

No definition available.

+ Details

Name:	cve_ContingentLiabilitiesSensitivityRange
Namespace Prefix:	cve_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Disclosure of sensitivity of fair value measurement to changes in unobservable inputs liabilities.

+ References

No definition available.

+ Details

Name:	cve_DisclosureOfSensitivityOfFairValueMeasurementToChangesInUnobservableInputsLiabilitiesLineItems
Namespace Prefix:	cve_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Theoretical impact to net earnings before tax from decrease in option pricing model sensitivity inputs.

+ References

No definition available.

+ Details

Name:	cve_TheoreticalImpactToNetEarningsBeforeTaxFromDecreaseInOptionPricingModelSensitivityInputs
Namespace Prefix:	cve_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Theoretical impact to net earnings before tax from increase in option pricing model sensitivity inputs.

+ References

No definition available.

+ Details

Name:	cve_TheoreticalImpactToNetEarningsBeforeTaxFromIncreaseInOptionPricingModelSensitivityInputs
Namespace Prefix:	cve_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	ifrs-full_ItemsOfContingentLiabilitiesAxis=cve_WesternCanadianSelectForwardPricingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ItemsOfContingentLiabilitiesAxis=cve_WestTexasIntermediateOptionVolatilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ItemsOfContingentLiabilitiesAxis=cve_ForeignExchangeVolatilityRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: