XML 91 R61.htm IDEA: XBRL DOCUMENT
v3.8.0.1

INVESTMENTS - Narrative (Details) - CAD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017
Investment in PrairieSky Royalty Ltd. |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Non-cash share consideration received |  | $ 985 |
Non-cash share consideration received (in shares) |  | 44.4 |
Non-cash share consideration received, price per share (in CAD per share) |  | $ 22.16 |
Ownership interest in investment (less than) |  |  | 10.00%
Number of shares held as investment (in shares) |  |  | 22.6
Investment in Inter Pipeline Ltd. |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Number of shares held as investment (in shares) |  |  | 6.4
Partial disposal of PrairieSky Royalty Ltd. |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Non-cash shares distributed (in shares) | 21.8 |  |
Return of capital on PrairieSky Royalty Ltd. share distribution | $ 546 |  |
Disposal of Cold Lake Pipeline | Investment in Inter Pipeline Ltd. |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Non-cash share consideration received | $ 190 |  |
Non-cash share consideration received (in shares) | 6.4 |  |
Non-cash share consideration received, price per share (in CAD per share) | $ 29.57 |  |

X
- Definition Consideration Received, Equity Interests Of Acquiree + References No definition available. + Details
Name: | cnq_ConsiderationReceivedEquityInterestsOfAcquiree
Namespace Prefix: | cnq_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Consideration Received, Equity Interests Of Acquiree, Share Price + References No definition available. + Details
Name: | cnq_ConsiderationReceivedEquityInterestsOfAcquireeSharePrice
Namespace Prefix: | cnq_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Consideration Received, Number Of Instruments Or Interests Received + References No definition available. + Details
Name: | cnq_ConsiderationReceivedNumberOfInstrumentsOrInterestsReceived
Namespace Prefix: | cnq_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Current Investments, Number Of Shares Held + References No definition available. + Details
Name: | cnq_CurrentInvestmentsNumberOfSharesHeld
Namespace Prefix: | cnq_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Current Investments, Percent Of Shares Held + References No definition available. + Details
Name: | cnq_CurrentInvestmentsPercentOfSharesHeld
Namespace Prefix: | cnq_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Non-Cash Assets Recognized As Distributions To Owners, Shares + References No definition available. + Details
Name: | cnq_NonCashAssetsRecognizedAsDistributionsToOwnersShares
Namespace Prefix: | cnq_
Data Type: | xbrli:sharesItemType
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_DisclosureOfFinancialInstrumentsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The decrease in equity resulting from a reduction in issued capital. [Refer: Issued capital] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_106_d&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_ReductionOfIssuedCapital
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | cnq_InvestmentNameAxis=cnq_PrairieSkyRoyaltyLtd.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cnq_InvestmentNameAxis=cnq_InterPipelineLtd.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ContinuingAndDiscontinuedOperationsAxis=cnq_DisposalGroupNotDiscontinuedOperationsPartialDisposalPraireSkyRoyaltyLtd.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ContinuingAndDiscontinuedOperationsAxis=cnq_DisposalGroupNotDiscontinuedOperationsColdLakePipelineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |