XML 89 R90.htm IDEA: XBRL DOCUMENT v3.20.1

Share Capital - Narrative (Details) - CAD ($) $ / shares in Units, $ in Millions					3 Months Ended	12 Months Ended
	Apr. 04, 2020	Mar. 06, 2019	Feb. 28, 2018	Mar. 01, 2017	Mar. 17, 2020	Dec. 31, 2019	May 22, 2019	Dec. 31, 2018	Dec. 31, 2017	May 21, 2019
Disclosure of terms and conditions of share-based payment arrangement [line items]
Quarterly dividend declared (in CAD per share)	$ 0.425	$ 0.375	$ 0.335	$ 0.275
Share repurchase term							12 months
Shares repurchased and retired (in shares)						25,900,000
Weighted average price per share of shares repurchased and retired (in CAD per share)						$ 36.32
Purchase of common shares under Normal Course Issuer Bid						$ 941
Top of range
Disclosure of terms and conditions of share-based payment arrangement [line items]
Shares authorized to be repurchased through Normal Course Issuer Bid (in shares)										59,729,706
Stock options
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting term						5 years
Shares that may be reserved for issuance as a percentage of common shares outstanding						7.00%
Stock options | Bottom of range
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expiration term						5 years
Stock options | Top of range
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expiration term						6 years
Retained earnings
Disclosure of terms and conditions of share-based payment arrangement [line items]
Purchase of common shares under Normal Course Issuer Bid						$ 738		$ 1,044	$ 0
Purchase Of Common Shares For Retirement
Disclosure of terms and conditions of share-based payment arrangement [line items]
Shares repurchased and retired (in shares)					6,970,000
Weighted average price per share of shares repurchased and retired (in CAD per share)					$ 38.84
Purchase of common shares under Normal Course Issuer Bid					$ 271

X

- Definition

Number Of Shares Authorised In Share Based Payment Arrangement As A Percentage Of Common Shares Outstanding

+ References

No definition available.

+ Details

Name:	cnq_NumberOfSharesAuthorisedInShareBasedPaymentArrangementAsAPercentageOfCommonSharesOutstanding
Namespace Prefix:	cnq_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Share-based Compensation Arrangement By Share-based Payment Award Expiration Period1

+ References

No definition available.

+ Details

Name:	cnq_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationPeriod1
Namespace Prefix:	cnq_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Share-Based Compensation Arrangement by Share-based Payment Award, Award Vesting Period2

+ References

No definition available.

+ Details

Name:	cnq_ShareBasedCompensationArrangementbySharebasedPaymentAwardAwardVestingPeriod2
Namespace Prefix:	cnq_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Stock Purchase Program, Term

+ References

No definition available.

+ Details

Name:	cnq_StockPurchaseProgramTerm
Namespace Prefix:	cnq_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Stock Repurchase Program, Number Of Shares Authorized To Be Repurchased1

+ References

No definition available.

+ Details

Name:	cnq_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased1
Namespace Prefix:	cnq_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Stock Repurchased And Retired During Period, Shares 1

+ References

No definition available.

+ Details

Name:	cnq_StockRepurchasedAndRetiredDuringPeriodShares1
Namespace Prefix:	cnq_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Stock Repurchased And Retired During Period, Value 1

+ References

No definition available.

+ Details

Name:	cnq_StockRepurchasedAndRetiredDuringPeriodValue1
Namespace Prefix:	cnq_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Stock Repurchased During Period, Weighted Average Price Per Share

+ References

No definition available.

+ Details

Name:	cnq_StockRepurchasedDuringPeriodWeightedAveragePricePerShare
Namespace Prefix:	cnq_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- 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_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount, per share, of dividends recognised as distributions to owners.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 107
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_107&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_DividendsRecognisedAsDistributionsToOwnersPerShare
Namespace Prefix:	ifrs-full_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=cnq_EmployeeStockOption1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ComponentsOfEquityAxis=ifrs-full_RetainedEarningsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=cnq_PurchaseOfCommonSharesForRetirementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: