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: |