XML 115 R85.htm IDEA: XBRL DOCUMENT
v3.8.0.1

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - CAD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Analysis Of Other Comprehensive Income By Item [Abstract] |  |
Derivative financial instruments designated as cash flow hedges | $ 47 | $ 27
Foreign currency translation adjustment | (115) | 43
Accumulated other comprehensive income (loss) | $ (68) | $ 70

X
- Definition Accumulated Other Comprehensive Income, Net Of Tax, Derivative Instruments Designated As Cash Flow Hedges + References No definition available. + Details
Name: | cnq_AccumulatedOtherComprehensiveIncomeNetOfTaxDerivativeInstrumentsDesignatedAsCashFlowHedges
Namespace Prefix: | cnq_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Accumulated Other Comprehensive Income, Net Of Tax, Exchange Differences On Translation + References No definition available. + Details
Name: | cnq_AccumulatedOtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation
Namespace Prefix: | cnq_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Analysis Of Other Comprehensive Income By Item [Abstract] + References No definition available. + Details
Name: | cnq_AnalysisOfOtherComprehensiveIncomeByItemAbstract
Namespace Prefix: | cnq_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of accumulated items of income and expense (including reclassification adjustments) that are not recognised in profit or loss as required or permitted by other IFRSs. [Refer: IFRSs [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_AccumulatedOtherComprehensiveIncome
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant