CANADIAN NATURAL RESOURCES LTD (SEC Filing Page | XBRL Cloud Viewer | XBRL Instance)

Line Label Object Class Period Type Balance Report ElementName
1 0001000 - Document - DOCUMENT AND ENTITY INFORMATION Network

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2 Implied Table Table

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3 Document And Entity Information [Abstract] Abstract cnq:DocumentAndEntityInformationAbstract
4 Entity Registrant Name Concept (Text/String) For Period dei:EntityRegistrantName
5 Entity Central Index Key Concept (CIK Number) For Period dei:EntityCentralIndexKey
6 Current Fiscal Year End Date Concept (Month/Day) For Period dei:CurrentFiscalYearEndDate
7 Entity Current Reporting Status Concept (Yes/No) For Period dei:EntityCurrentReportingStatus
8 Document Type Concept (Submission Type) For Period dei:DocumentType
9 Document Period End Date Concept (Date) For Period dei:DocumentPeriodEndDate
10 Document Fiscal Year Focus Concept (Year) For Period dei:DocumentFiscalYearFocus
11 Document Fiscal Period Focus Concept (Fiscal Period) For Period dei:DocumentFiscalPeriodFocus
12 Amendment Flag Concept (Yes/No) For Period dei:AmendmentFlag
13 Emerging Growth Company Concept (Yes/No) For Period dei:EntityEmergingGrowthCompany
14 Entity Common Stock, Shares Outstanding (in shares) Concept (Shares) As Of dei:EntityCommonStockSharesOutstanding
15 1002000 - Statement - CONSOLIDATED BALANCE SHEETS Network

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16 Implied Table Table

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17 Statement of financial position [abstract] Abstract ifrs-full:StatementOfFinancialPositionAbstract
18 ASSETS Abstract ifrs-full:AssetsAbstract
19 Current assets Abstract ifrs-full:CurrentAssetsAbstract
20 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
21 Accounts receivable Concept (Monetary) As Of Debit ifrs-full:CurrentTradeReceivables
22 Current income taxes receivable Concept (Monetary) As Of Debit ifrs-full:CurrentTaxAssetsCurrent
23 Inventory Concept (Monetary) As Of Debit ifrs-full:Inventories
24 Prepaids and other Concept (Monetary) As Of Debit ifrs-full:CurrentPrepaymentsAndOtherCurrentAssets
25 Investments Concept (Monetary) As Of Debit ifrs-full:CurrentInvestments
26 Current portion of other long-term assets Concept (Monetary) As Of Debit ifrs-full:OtherCurrentAssets
27 Current assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
28 Non-current assets Abstract ifrs-full:NoncurrentAssetsAbstract
29 Exploration and evaluation assets Concept (Monetary) As Of Debit ifrs-full:AssetsArisingFromExplorationForAndEvaluationOfMineralResources
30 Property, plant and equipment Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
31 Other long-term assets Concept (Monetary) As Of Debit ifrs-full:OtherNoncurrentAssets
32 Assets Concept (Monetary) As Of Debit ifrs-full:Assets
33 LIABILITIES Abstract ifrs-full:LiabilitiesAbstract
34 Current liabilities Abstract ifrs-full:CurrentLiabilitiesAbstract
35 Accounts payable Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayablesToTradeSuppliers
36 Accrued liabilities Concept (Monetary) As Of Credit ifrs-full:AccrualsClassifiedAsCurrent
37 Current income taxes payable Concept (Monetary) As Of Credit ifrs-full:CurrentTaxLiabilitiesCurrent
38 Current portion of long-term debt Concept (Monetary) As Of Credit ifrs-full:CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings
39 Current portion of other long-term liabilities Concept (Monetary) As Of Credit ifrs-full:OtherCurrentLiabilities
40 Current liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
41 Non-current liabilities Abstract ifrs-full:NoncurrentLiabilitiesAbstract
42 Long-term debt Concept (Monetary) As Of Credit ifrs-full:LongtermBorrowings
43 Other long-term liabilities Concept (Monetary) As Of Credit ifrs-full:OtherNoncurrentLiabilities
44 Deferred income taxes Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
45 Liabilities Concept (Monetary) As Of Credit ifrs-full:Liabilities
46 SHAREHOLDERS’ EQUITY Abstract ifrs-full:EquityAbstract
47 Share capital Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
48 Retained earnings Concept (Monetary) As Of Credit ifrs-full:RetainedEarnings
49 Accumulated other comprehensive income (loss) Concept (Monetary) As Of Credit ifrs-full:AccumulatedOtherComprehensiveIncome
50 Shareholders' equity Concept (Monetary) As Of Credit ifrs-full:Equity
51 Liabilities and shareholders' equity Concept (Monetary) As Of Credit ifrs-full:EquityAndLiabilities
52 1003000 - Statement - CONSOLIDATED STATEMENTS OF EARNINGS (LOSS) Network

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53 Implied Table Table

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54 Profit or loss [abstract] Abstract ifrs-full:IncomeStatementAbstract
55 Product sales Concept (Monetary) For Period Credit ifrs-full:RevenueFromSaleOfOilAndGasProducts
56 Less: royalties Concept (Monetary) For Period Debit ifrs-full:RoyaltyExpense
57 Revenue Concept (Monetary) For Period Credit ifrs-full:Revenue
58 Expenses Abstract ifrs-full:ExpenseByNatureAbstract
59 Production Concept (Monetary) For Period Debit cnq:CostOfSalesProductionExpense
60 Transportation, blending and feedstock Concept (Monetary) For Period Debit cnq:CostOfSalesTransportationBlendingAndFeedstockExpense
61 Depletion, depreciation and amortization Concept (Monetary) For Period Debit ifrs-full:DepreciationAndAmortisationExpense
62 Administration Concept (Monetary) For Period Debit ifrs-full:AdministrativeExpense
63 Share-based compensation Concept (Monetary) For Period Debit ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
64 Asset retirement obligation accretion Concept (Monetary) For Period Debit cnq:DecommissioningRestorationAndRehabilitationCostsArisingFromPassageOfTIme
65 Interest and other financing expense Concept (Monetary) For Period Credit ifrs-full:FinanceIncomeCost
66 Risk management activities Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnChangeInFairValueOfDerivatives
67 Foreign exchange loss (gain) Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss
68 Gain on acquisition, disposition and revaluation of properties Concept (Monetary) For Period Credit cnq:GainsLossesOnAcquisitionsDisposalsAndRevaluationOfPropertyPlantAndEquipmentExplorationAndEvaluationAssets
69 Loss (gain) from investments Concept (Monetary) For Period Credit cnq:GainsLossesOnInvestments
70 Total expenses Concept (Monetary) For Period Debit ifrs-full:ExpenseByNature
71 Earnings (loss) before taxes Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
72 Current income tax expense (recovery) Concept (Monetary) For Period Debit ifrs-full:CurrentTaxExpenseIncome
73 Deferred income tax expense (recovery) Concept (Monetary) For Period Debit ifrs-full:DeferredTaxExpenseIncome
74 Net earnings (loss) Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
75 Net earnings (loss) per common share Abstract ifrs-full:EarningsPerShareAbstract
76 Basic earnings (loss) per share (in CAD per share) Concept (Share) For Period ifrs-full:BasicEarningsLossPerShare
77 Diluted earnings (loss) per share (in CAD per share) Concept (Share) For Period ifrs-full:DilutedEarningsLossPerShare
78 1004000 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) Network

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79 Implied Table Table

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80 Statement of comprehensive income [abstract] Abstract ifrs-full:StatementOfComprehensiveIncomeAbstract
81 Net earnings (loss) Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
82 Items that may be reclassified subsequently to net earnings (loss) Abstract ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract
83 Net change in derivative financial instruments designated as cash flow hedges Abstract ifrs-full:CashFlowHedgesAbstract
84 Unrealized income (loss), net of taxes of $nil (2017 – $9 million, 2016 – $3 million) Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnCashFlowHedgesNetOfTax
85 Reclassification to net earnings (loss), net of taxes of $6 million (2017 – $5 million, 2016 – $2 million) Concept (Monetary) For Period Debit ifrs-full:ReclassificationAdjustmentsOnCashFlowHedgesNetOfTax
86 Net change in derivative financial instruments designated as cash flow hedges Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges
87 Foreign currency translation adjustment Abstract ifrs-full:ExchangeDifferencesOnTranslationAbstract
88 Translation of net investment Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation
89 Other comprehensive income (loss), net of taxes Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncome
90 Comprehensive income (loss) Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
91 1004001 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) Network

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92 Implied Table Table

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93 Statement of comprehensive income [abstract] Abstract ifrs-full:StatementOfComprehensiveIncomeAbstract
94 Unrealized income (loss), tax Concept (Monetary) For Period Debit cnq:IncomeTaxRelatingToGainsLossesOnCashFlowHedgesOfOtherComprehensiveIncome
95 Reclassification to net earnings (loss), tax Concept (Monetary) For Period Debit cnq:IncomeTaxRelatingToReclassificationAdjustmentsOnCashFlowHedgesOfOtherComprehensiveIncome
96 1005000 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY Network

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97 Statement of changes in equity [table] Table

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 ifrs-full:StatementOfChangesInEquityTable
98 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
99 Equity [member] Member ifrs-full:EquityMember
100 Share capital Member ifrs-full:IssuedCapitalMember
101 Retained earnings Member ifrs-full:RetainedEarningsMember
102 Accumulated other comprehensive income (loss) Member ifrs-full:AccumulatedOtherComprehensiveIncomeMember
103 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
104 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
105 AOSP Member cnq:AthabascaOilSandsProjectAndOtherAssetsMember
106 Statement of changes in equity [line items] LineItems ifrs-full:StatementOfChangesInEquityLineItems
107 Balance – beginning of year Concept (Monetary) As Of Credit ifrs-full:Equity
108 Issued for the acquisition of AOSP and other assets Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughAcquisitionOfSubsidiary
109 Issued upon exercise of stock options Concept (Monetary) For Period Credit cnq:IncreaseDecreaseThroughExerciseOfOptionsCashReceived
110 Previously recognized liability on stock options exercised for common shares Concept (Monetary) For Period Credit cnq:IncreaseDecreaseThroughExerciseOfOptionsAdditionalValueReceivedInExcessOfCash
111 Purchase of common shares under Normal Course Issuer Bid Concept (Monetary) For Period Credit cnq:StockRepurchasedAndRetiredDuringPeriodValue1
112 Return of capital on PrairieSky Royalty Ltd. share distribution Concept (Monetary) For Period Debit ifrs-full:ReductionOfIssuedCapital
113 Net earnings (loss) Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
114 Dividends on common shares Concept (Monetary) For Period Debit ifrs-full:DividendsPaid
115 Other comprehensive income (loss), net of taxes Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncome
116 Balance – end of year Concept (Monetary) As Of Credit ifrs-full:Equity
117 Non-cash share considerations issued on the acquisition of AOSP and other assets Concept (Monetary) As Of Credit ifrs-full:EquityInterestsOfAcquirer
118 1006000 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS Network

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119 Disclosure of detailed information about business combination [table] Table

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 ifrs-full:DisclosureOfBusinessCombinationsTable
120 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
121 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
122 AOSP Member cnq:AthabascaOilSandsProjectAndOtherAssetsMember
123 Continuing and discontinued operations [axis] Axis ifrs-full:ContinuingAndDiscontinuedOperationsAxis
124 Aggregate continuing and discontinued operations [member] Member ifrs-full:AggregateContinuingAndDiscontinuedOperationsMember
125 Disposal of Cold Lake Pipeline Member cnq:DisposalGroupNotDiscontinuedOperationsColdLakePipelineMember
126 Investment, Name [Axis] Axis cnq:InvestmentNameAxis
127 Investment, Name [Domain] Member cnq:InvestmentNameDomain
128 Investment in Inter Pipeline Ltd. Member cnq:InterPipelineLtd.Member
129 Disclosure of detailed information about business combination [line items] LineItems ifrs-full:DisclosureOfBusinessCombinationsLineItems
130 Operating activities Abstract ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
131 Net earnings (loss) Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
132 Non-cash items Abstract ifrs-full:AdjustmentsForReconcileProfitLossAbstract
133 Depletion, depreciation and amortization Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDepreciationAndAmortisationExpense
134 Share-based compensation Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForSharebasedPayments
135 Asset retirement obligation accretion Concept (Monetary) For Period Debit cnq:AdjustmentForDecommissioningRestorationAndRehabilitationCostsArisingFromThePassageOfTIme
136 Unrealized risk management (gain) loss Concept (Monetary) For Period Credit ifrs-full:AdjustmentsForGainsLossesOnChangeInFairValueOfDerivatives
137 Unrealized foreign exchange loss (gain) Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForUnrealisedForeignExchangeLossesGains
138 Realized foreign exchange loss on repayment of US dollar securities Concept (Monetary) For Period Debit cnq:ForeignCurrencyTransactionLoss1
139 Gain on acquisition, disposition and revaluation of properties Concept (Monetary) For Period Debit cnq:AdjustmentForGainsLossesOnAcquisitionsDisposalsAndRevaluationOfPropertyPlantAndEquipmentExplorationAndEvaluationAssets
140 Loss (gain) from investments Concept (Monetary) For Period Credit cnq:AdjustmentsForGainLossOnInvestments
141 Deferred income tax expense (recovery) Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDeferredTaxExpense
142 Other Concept (Monetary) For Period Debit ifrs-full:OtherInflowsOutflowsOfCashClassifiedAsOperatingActivities
143 Abandonment expenditures Concept (Monetary) For Period Credit cnq:DecommissioningRestorationAndRehabilitationCostsProvisionUsed
144 Net change in non-cash working capital Concept (Monetary) For Period Credit cnq:IncreaseDecreaseInWorkingCapitalOperatingActivities
145 Cash flows from operating activities Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperatingActivities
146 Financing activities Abstract ifrs-full:CashFlowsFromUsedInFinancingActivitiesAbstract
147 (Repayment) issue of bank credit facilities and commercial paper, net Concept (Monetary) For Period Debit cnq:IssuanceRepaymentsOfLineOfCreditBorrowingsClassifiedAsFinancingActivities
148 Issue of medium-term notes, net Concept (Monetary) For Period Debit cnq:IssuanceRepaymentsOfMediumTermBorrowingsClassifiedAsFinancingActivities
149 (Repayment) issue of US dollar debt securities, net Concept (Monetary) For Period Debit cnq:IssuanceRepaymentsOfLongTermBorrowingsClassifiedAsFinancingActivities
150 Issue of common shares on exercise of stock options Concept (Monetary) For Period Debit ifrs-full:ProceedsFromExerciseOfOptions
151 Purchase of common shares under Normal Course Issuer Bid Concept (Monetary) For Period Credit ifrs-full:PaymentsToAcquireOrRedeemEntitysShares
152 Dividends on common shares Concept (Monetary) For Period Credit ifrs-full:DividendsPaidClassifiedAsFinancingActivities
153 Cash flows (used in) from financing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInFinancingActivities
154 Investing activities Abstract ifrs-full:CashFlowsFromUsedInInvestingActivitiesAbstract
155 Net (expenditures) proceeds on exploration and evaluation assets Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInExplorationForAndEvaluationOfMineralResourcesClassifiedAsInvestingActivities
156 Net expenditures on property, plant and equipment Concept (Monetary) For Period Debit cnq:CashFlowsFromUsedInPropertyPlantandEquipmentClassifiedAsInvestingActivities
157 Acquisition of AOSP and other assets, net of cash acquired Concept (Monetary) For Period Credit ifrs-full:CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities
158 Investment in other long-term assets Concept (Monetary) For Period Credit ifrs-full:PurchaseOfOtherLongtermAssetsClassifiedAsInvestingActivities
159 Net change in non-cash working capital Concept (Monetary) For Period Credit cnq:IncreaseDecreaseInWorkingCapitalInvestingActivities
160 Cash flows used in investing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInInvestingActivities
161 (Decrease) increase in cash and cash equivalents Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseInCashAndCashEquivalents
162 Cash and cash equivalents – beginning of year Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
163 Cash and cash equivalents – end of year Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
164 Interest paid, net Concept (Monetary) For Period Credit cnq:InterestPaidReceivedNet
165 Income taxes received Concept (Monetary) For Period Credit ifrs-full:IncomeTaxesPaidRefund
166 Non-cash share consideration received Concept (Monetary) For Period Debit cnq:ConsiderationReceivedEquityInterestsOfAcquiree
167 Other working capital Concept (Monetary) As Of Debit cnq:OtherWorkingCapitalRecognizedAsOfAcquisitionDate
168 Fair value of share considerations issued Concept (Monetary) As Of Credit ifrs-full:EquityInterestsOfAcquirer
169 2101100 - Disclosure - ACCOUNTING POLICIES Network

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170 Implied Table Table

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171 Corporate Information And Statement Of IFRS Compliance [Abstract] Abstract cnq:CorporateInformationAndStatementOfIFRSComplianceAbstract
172 ACCOUNTING POLICIES Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory
173 2102100 - Disclosure - CHANGES IN ACCOUNTING POLICIES Network

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174 Implied Table Table

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175 Corporate Information And Statement Of IFRS Compliance [Abstract] Abstract cnq:CorporateInformationAndStatementOfIFRSComplianceAbstract
176 CHANGES IN ACCOUNTING POLICIES Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfChangesInAccountingPoliciesExplanatory
177 2104100 - Disclosure - ACCOUNTING STANDARDS ISSUED BUT NOT YET APPLIED Network

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178 Implied Table Table

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179 Corporate Information And Statement Of IFRS Compliance [Abstract] Abstract cnq:CorporateInformationAndStatementOfIFRSComplianceAbstract
180 ACCOUNTING STANDARDS ISSUED BUT NOT YET APPLIED Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfChangesInAccountingPoliciesExplanatory
181 2107100 - Disclosure - CRITICAL ACCOUNTING ESTIMATES AND JUDGEMENTS Network

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182 Implied Table Table

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183 Corporate Information And Statement Of IFRS Compliance [Abstract] Abstract cnq:CorporateInformationAndStatementOfIFRSComplianceAbstract
184 CRITICAL ACCOUNTING ESTIMATES AND JUDGEMENTS Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfAccountingJudgementsAndEstimatesExplanatory
185 2110100 - Disclosure - INVENTORY Network

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186 Implied Table Table

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187 Inventories [Abstract] Abstract cnq:InventoriesAbstract
188 INVENTORY Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInventoriesExplanatory
189 2113100 - Disclosure - EXPLORATION AND EVALUATION ASSETS Network

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190 Implied Table Table

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191 Exploration For And Evaluation Of Mineral Resources [Abstract] Abstract cnq:ExplorationForAndEvaluationOfMineralResourcesAbstract
192 EXPLORATION AND EVALUATION ASSETS Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfExplorationAndEvaluationAssetsExplanatory
193 2116100 - Disclosure - PROPERTY, PLANT AND EQUIPMENT Network

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194 Implied Table Table

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195 Property, plant and equipment [abstract] Abstract ifrs-full:PropertyPlantAndEquipmentAbstract
196 PROPERTY, PLANT AND EQUIPMENT Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfPropertyPlantAndEquipmentExplanatory
197 2119100 - Disclosure - ACQUISITION OF INTERESTS IN THE ATHABASCA OIL SANDS PROJECT AND OTHER ASSETS Network

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198 Implied Table Table

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199 Business Combinations1 [Abstract] Abstract cnq:BusinessCombinations1Abstract
200 ACQUISITION OF INTERESTS IN THE ATHABASCA OIL SANDS PROJECT AND OTHER ASSETS Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBusinessCombinationsExplanatory
201 2120100 - Disclosure - INVESTMENTS Network

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202 Implied Table Table

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203 Financial Instruments [Abstract] Abstract cnq:FinancialInstrumentsAbstract
204 INVESTMENTS Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethodExplanatory
205 2122100 - Disclosure - OTHER LONG-TERM ASSETS Network

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206 Implied Table Table

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207 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
208 OTHER LONG-TERM ASSETS Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOtherNoncurrentAssetsExplanatory
209 2123100 - Disclosure - LONG-TERM DEBT Network

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210 Implied Table Table

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211 Financial Instruments [Abstract] Abstract cnq:FinancialInstrumentsAbstract
212 LONG-TERM DEBT Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBorrowingsExplanatory
213 2125100 - Disclosure - OTHER LONG-TERM LIABILITIES Network

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214 Implied Table Table

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215 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
216 OTHER LONG-TERM LIABILITIES Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOtherNoncurrentLiabilitiesExplanatory
217 2128100 - Disclosure - INCOME TAXES Network

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218 Implied Table Table

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219 Income Taxes [Abstract] Abstract cnq:IncomeTaxesAbstract
220 INCOME TAXES Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIncomeTaxExplanatory
221 2131100 - Disclosure - SHARE CAPITAL Network

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222 Implied Table Table

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223 Share Capital, Reserves And Other Equity Interest [Abstract] Abstract cnq:ShareCapitalReservesAndOtherEquityInterestAbstract
224 SHARE CAPITAL Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIssuedCapitalExplanatory
225 2134100 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Network

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226 Implied Table Table

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227 Analysis Of Other Comprehensive Income By Item [Abstract] Abstract cnq:AnalysisOfOtherComprehensiveIncomeByItemAbstract
228 ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemExplanatory
229 2137100 - Disclosure - CAPITAL DISCLOSURES Network

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230 Implied Table Table

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231 Corporate Information And Statement Of IFRS Compliance [Abstract] Abstract cnq:CorporateInformationAndStatementOfIFRSComplianceAbstract
232 CAPITAL DISCLOSURES Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalExplanatory
233 2140100 - Disclosure - NET EARNINGS (LOSS) PER COMMON SHARE Network

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234 Implied Table Table

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235 Earnings per share [abstract] Abstract ifrs-full:EarningsPerShareAbstract
236 NET EARNINGS (LOSS) PER COMMON SHARE Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEarningsPerShareExplanatory
237 2143100 - Disclosure - INTEREST AND OTHER FINANCING EXPENSE Network

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238 Implied Table Table

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239 Borrowing costs [abstract] Abstract ifrs-full:BorrowingCostsAbstract
240 INTEREST AND OTHER FINANCING EXPENSE Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinanceIncomeExpenseExplanatory
241 2146100 - Disclosure - FINANCIAL INSTRUMENTS Network

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242 Implied Table Table

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243 Financial Instruments [Abstract] Abstract cnq:FinancialInstrumentsAbstract
244 FINANCIAL INSTRUMENTS Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialInstrumentsExplanatory
245 2149100 - Disclosure - COMMITMENTS AND CONTINGENCIES Network

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246 Implied Table Table

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247 Other Provisions, Contingent Liabilities And Contingent Assets [Abstract] Abstract cnq:OtherProvisionsContingentLiabilitiesAndContingentAssetsAbstract
248 COMMITMENTS AND CONTINGENCIES Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCommitmentsAndContingentLiabilitiesExplanatory
249 2152100 - Disclosure - SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION Network

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250 Implied Table Table

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251 Statement Of Cash Flows, Additional Disclosures [Abstract] Abstract cnq:StatementOfCashFlowsAdditionalDisclosuresAbstract
252 SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCashFlowStatementExplanatory
253 2155100 - Disclosure - SEGMENTED INFORMATION Network

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254 Implied Table Table

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255 Operating Segments [Abstract] Abstract cnq:OperatingSegmentsAbstract
256 SEGMENTED INFORMATION Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEntitysReportableSegmentsExplanatory
257 2158100 - Disclosure - REMUNERATION OF DIRECTORS AND SENIOR MANAGEMENT Network

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258 Implied Table Table

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259 Related Party [Abstract] Abstract cnq:RelatedPartyAbstract
260 REMUNERATION OF DIRECTORS AND SENIOR MANAGEMENT Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInformationAboutKeyManagementPersonnelExplanatory
261 2159100 - Disclosure - SUPPLEMENTARY OIL & GAS INFORMATION (Unaudited) Network

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262 Implied Table Table

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263 Extractive Industries [Abstract] Abstract srt:ExtractiveIndustriesAbstract
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516 Oil Sands Mining and Upgrading Member cnq:OilSandsMiningAndUpgradingSegmentMember
517 Midstream Member cnq:MidstreamSegmentMember
518 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
519 Carrying amount Member ifrs-full:CarryingAmountMember
520 Cost Member ifrs-full:GrossCarryingAmountMember
521 Accumulated depletion and depreciation Member ifrs-full:AccumulatedDepreciationAndAmortisationMember
522 Disclosure of detailed information about property, plant and equipment [line items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
523 Reconciliation of changes in property, plant and equipment [abstract] Abstract ifrs-full:ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract
524 Beginning balance Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
525 Additions Concept (Monetary) For Period Debit cnq:AdditionsPropertyPlantAndEquipment
526 Acquisition of AOSP and other assets (note 7) Concept (Monetary) For Period Debit ifrs-full:AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment
527 Transfers from E&E assets Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment
528 Disposals/derecognitions Concept (Monetary) For Period Credit ifrs-full:DisposalsPropertyPlantAndEquipment
529 Foreign exchange adjustments and other Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment
530 Expense Concept (Monetary) For Period ifrs-full:DepreciationPropertyPlantAndEquipment
531 Ending balance Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
532 Revaluation pre-tax gain Concept (Monetary) For Period Debit ifrs-full:RevaluationIncreaseDecreasePropertyPlantAndEquipment
533 Project costs not subject to depletion and depreciation Concept (Monetary) As Of Debit ifrs-full:ConstructionInProgress
534 2416403 - Disclosure - PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) Network

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535 Disclosure of detailed information about property, plant and equipment [table] Table

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536 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
537 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
538 AOSP Member cnq:AthabascaOilSandsProjectAndOtherAssetsMember
539 Segments [axis] Axis ifrs-full:SegmentsAxis
540 Segments [member] Member ifrs-full:SegmentsMember
541 North America Member cnq:NorthAmericaExplorationAndProductionSegmentMember
542 North Sea Member cnq:NorthSeaExplorationAndProductionSegmentMember
543 North America, Exploration and Production segment and Midstream segment Member cnq:NorthAmericaExplorationAndProductionSegmentAndMidstreamSegmentMember
544 Oil Sands Mining and Upgrading segment and North America Exploration and Production segment Member cnq:OilSandsMiningAndUpgradingSegmentAndNorthAmericaExplorationAndProductionSegmentMember
545 Midstream Member cnq:MidstreamSegmentMember
546 Disclosure of detailed information about property, plant and equipment [line items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
547 Net cash paid for consideration for acquisition of exploration and evaluation assets Concept (Monetary) For Period Credit cnq:AcquisitionsThroughOtherBusinessCombinationsNetCashConsiderationPaid
548 Asset retirement obligations Concept (Monetary) As Of Credit cnq:DecommissioningRestorationAndRehabilitationAssetsRecognizedAsofAcquisitionDate
549 Deferred tax liabilities Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate
550 Gains on acquisitions of property, plant and equipment, pre-tax Concept (Monetary) For Period Credit cnq:GainsOnAcquisitionsOfPropertyPlantAndEquipment
551 Property, plant and equipment acquisition Concept (Monetary) For Period Debit cnq:AdditionsPropertyPlantAndEquipment
552 Net proceeds received for acquisition of property, plant and equipment Concept (Monetary) For Period Debit cnq:AcquisitionsThroughOtherBusinessCombinationsNetCashConsiderationReceived
553 Net working capital assets recognised, property, plant and equipment acquisition Concept (Monetary) As Of Debit cnq:NetWorkingCapitalAssetsRecognisedAsOfAcquisitionDate
554 Revaluation pre-tax gain Concept (Monetary) For Period Debit ifrs-full:RevaluationIncreaseDecreasePropertyPlantAndEquipment
555 Return of asset retirement obligations upon disposal of property Concept (Monetary) As Of Debit cnq:DisposalsProvisionForDecommissioningRestorationAndRehabilitationCosts
556 Disposals of property, plant and equipment pre-tax gain Concept (Monetary) For Period Credit ifrs-full:GainsOnDisposalsOfPropertyPlantAndEquipment
557 Disposals of property, plant and equipment after-tax gain Concept (Monetary) For Period Credit cnq:GainsOnDisposalsOfPropertyPlantAndEquipmentNetOfTax
558 Acquired exploration and evaluation assets Concept (Monetary) For Period Credit cnq:AcquisitionsThroughOtherBusinessCombinationsExplorationForAndEvaluationOfMineralResources
559 Revaluation after-tax gain Concept (Monetary) For Period Debit cnq:RevaluationIncreaseDecreasePropertyPlantAndEquipmentNetOfTax
560 Interest costs capitalized Concept (Monetary) For Period ifrs-full:BorrowingCostsCapitalised
561 Weighted average capitalization rate Concept (Percent) For Period ifrs-full:CapitalisationRateOfBorrowingCostsEligibleForCapitalisation
562 2419402 - Disclosure - ACQUISITION OF INTERESTS IN THE ATHABASCA OIL SANDS PROJECT AND OTHER ASSETS - Narrative (Details) Network

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563 Disclosure of detailed information about business combination [table] Table

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564 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
565 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
566 AOSP Member cnq:AthabascaOilSandsProjectAndOtherAssetsMember
567 AOSP, Mining And Extraction Operations Member cnq:AthabascaOilsSandsProjectMiningAndExtractionOperationsMember
568 AOSP, Scotford Upgrader And Quest Carbon Capture And Storage Project Member cnq:AthabascaOilsSandsProjectScotfordUpgraderAndQuestCarbonCaptureAndStorageProjectMember
569 AOSP, Peace River Thermal In Situ Operations And Cliffdale Heavy Oil Field Member cnq:AthabascaOilsSandsProjectPeaceRiverThermalInSituOperationsAndCliffdaleHeavyOilFieldMember
570 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
571 Borrowings by name Member ifrs-full:BorrowingsByNameMember
572 Medium-term notes Member cnq:MediumTermNotes1Member
573 Long-term debt Member ifrs-full:LongtermBorrowingsMember
574 Non-revolving term credit facility maturing May 2020 Member cnq:NonRevolvingTermCreditFacilityMaturingMay2020Member
575 Disclosure of detailed information about business combination [line items] LineItems ifrs-full:DisclosureOfBusinessCombinationsLineItems
576 Interest acquired Concept (Percent) As Of cnq:PercentageOfEquityInterestAcquired
577 Total purchase consideration Concept (Monetary) As Of Credit ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferred
578 Cash transferred Concept (Monetary) As Of Credit ifrs-full:CashTransferred
579 Common shares issued (in shares) Concept (Decimal) As Of ifrs-full:NumberOfInstrumentsOrInterestsIssuedOrIssuable
580 Fair value of share considerations issued Concept (Monetary) As Of Credit ifrs-full:EquityInterestsOfAcquirer
581 Deferred purchase consideration payable Concept (Monetary) As Of Credit ifrs-full:LiabilitiesIncurred
582 Borrowings Concept (Monetary) As Of Credit ifrs-full:Borrowings
583 Non-revolving term loan facility Concept (Monetary) As Of Credit cnq:LineOfCreditFacilityMaximumBorrowingCapacity1
584 Gain on acquisition, net of transaction costs Concept (Monetary) For Period Credit cnq:GainRecognisedInBargainPurchaseTransactionNetOfAcquisitionrelatedCosts
585 Acquisition related transaction costs Concept (Monetary) For Period Debit ifrs-full:AcquisitionrelatedCostsForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination
586 2419403 - Disclosure - ACQUISITION OF INTERESTS IN THE ATHABASCA OIL SANDS PROJECT AND OTHER ASSETS - Summary of Net Assets Acquired and Liabilities Assumed (Details) Network

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587 Disclosure of detailed information about business combination [table] Table

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588 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
589 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
590 AOSP Member cnq:AthabascaOilSandsProjectAndOtherAssetsMember
591 Disclosure of detailed information about business combination [line items] LineItems ifrs-full:DisclosureOfBusinessCombinationsLineItems
592 Cash Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalentsRecognisedAsOfAcquisitionDate
593 Other working capital Concept (Monetary) As Of Debit cnq:OtherWorkingCapitalRecognizedAsOfAcquisitionDate
594 Property, plant and equipment Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate
595 Exploration and evaluation assets Concept (Monetary) As Of Debit cnq:ExplorationAndEvaluationAssetsRecognizedAsOfAcquisitionDate
596 Asset retirement obligations Concept (Monetary) As Of Credit cnq:DecommissioningRestorationAndRehabilitationAssetsRecognizedAsofAcquisitionDate
597 Other long-term liabilities Concept (Monetary) As Of Credit cnq:OtherNoncurrentLiabilitiesRecognisedAsOfAcquisitionDate
598 Deferred income taxes Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate
599 Net assets acquired Concept (Monetary) As Of Debit ifrs-full:IdentifiableAssetsAcquiredLiabilitiesAssumed
600 Total purchase consideration Concept (Monetary) As Of Credit ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferred
601 Gain on acquisition before transaction costs Concept (Monetary) For Period Credit ifrs-full:GainRecognisedInBargainPurchaseTransaction
602 2420402 - Disclosure - INVESTMENTS - Summary of Investments (Details) Network

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603 Disclosure of detailed information about financial instruments [table] Table

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604 Investment, Name [Axis] Axis cnq:InvestmentNameAxis
605 Investment, Name [Domain] Member cnq:InvestmentNameDomain
606 Investment in PrairieSky Royalty Ltd. Member cnq:PrairieSkyRoyaltyLtd.Member
607 Investment in Inter Pipeline Ltd. Member cnq:InterPipelineLtd.Member
608 Disclosure of detailed information about financial instruments [line items] LineItems ifrs-full:DisclosureOfFinancialInstrumentsLineItems
609 Investments Concept (Monetary) As Of Debit ifrs-full:CurrentInvestments
610 2420403 - Disclosure - INVESTMENTS - Narrative (Details) Network

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611 Disclosure of detailed information about financial instruments [table] Table

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612 Continuing and discontinued operations [axis] Axis ifrs-full:ContinuingAndDiscontinuedOperationsAxis
613 Aggregate continuing and discontinued operations [member] Member ifrs-full:AggregateContinuingAndDiscontinuedOperationsMember
614 Disposal of Cold Lake Pipeline Member cnq:DisposalGroupNotDiscontinuedOperationsColdLakePipelineMember
615 Investment, Name [Axis] Axis cnq:InvestmentNameAxis
616 Investment, Name [Domain] Member cnq:InvestmentNameDomain
617 Investment in PrairieSky Royalty Ltd. Member cnq:PrairieSkyRoyaltyLtd.Member
618 Investment in Inter Pipeline Ltd. Member cnq:InterPipelineLtd.Member
619 Disclosure of detailed information about financial instruments [line items] LineItems ifrs-full:DisclosureOfFinancialInstrumentsLineItems
620 Number of shares held as investment (in shares) Concept (Shares) As Of cnq:CurrentInvestmentsNumberOfSharesHeld
621 Non-cash share consideration received Concept (Monetary) For Period Debit cnq:ConsiderationReceivedEquityInterestsOfAcquiree
622 Non-cash share consideration received (in shares) Concept (Shares) For Period cnq:ConsiderationReceivedNumberOfInstrumentsOrInterestsReceived
623 Non-cash share consideration received, price per share (in CAD per share) Concept (Share) As Of cnq:ConsiderationReceivedEquityInterestsOfAcquireeSharePrice
624 2420404 - Disclosure - INVESTMENTS - PrairieSky (Details) Network

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625 Disclosure of detailed information about financial instruments [table] Table

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626 Investment, Name [Axis] Axis cnq:InvestmentNameAxis
627 Investment, Name [Domain] Member cnq:InvestmentNameDomain
628 Investment in PrairieSky Royalty Ltd. Member cnq:PrairieSkyRoyaltyLtd.Member
629 Disclosure of detailed information about financial instruments [line items] LineItems ifrs-full:DisclosureOfFinancialInstrumentsLineItems
630 Fair value loss (gain) from PrairieSky Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLoss
631 Dividend income from PrairieSky Concept (Monetary) For Period Credit ifrs-full:RevenueFromDividends
632 (Gain) loss from investment Concept (Monetary) For Period Credit cnq:GainsLossesOnInvestments
633 2420405 - Disclosure - INVESTMENTS - Inter Pipeline (Details) Network

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634 Disclosure of financial assets [table] Table

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635 Investment, Name [Axis] Axis cnq:InvestmentNameAxis
636 Investment, Name [Domain] Member cnq:InvestmentNameDomain
637 Investment in Inter Pipeline Ltd. Member cnq:InterPipelineLtd.Member
638 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
639 Fair value loss from Inter Pipeline Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLoss
640 Dividend income from Inter Pipeline Concept (Monetary) For Period Credit ifrs-full:RevenueFromDividends
641 (Gain) loss from investment Concept (Monetary) For Period Credit cnq:GainsLossesOnInvestments
642 2422402 - Disclosure - OTHER LONG-TERM ASSETS - Schedule of other long-term assets (Details) Network

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643 Implied Table Table

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644 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
645 Investment in North West Redwater Partnership Concept (Monetary) As Of Debit ifrs-full:InvestmentAccountedForUsingEquityMethod
646 North West Redwater Partnership subordinated debt Concept (Monetary) As Of Debit ifrs-full:DebtInstrumentsHeld
647 Risk management (note 19) Concept (Monetary) As Of Debit ifrs-full:DerivativeFinancialAssets
648 Other Concept (Monetary) As Of Debit cnq:MIscellaneousOtherAssets
649 Other assets Concept (Monetary) As Of Debit ifrs-full:OtherAssets
650 Less: current portion Concept (Monetary) As Of Debit ifrs-full:OtherCurrentAssets
651 Other long-term assets Concept (Monetary) As Of Debit ifrs-full:OtherNoncurrentAssets
652 2422403 - Disclosure - OTHER LONG-TERM ASSETS - Narrative (Details) Network

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653 Disclosure of joint ventures [table] Table

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654 Non-adjusting events after reporting period [axis] Axis ifrs-full:NonadjustingEventsAfterReportingPeriodAxis
655 Non-adjusting events after reporting period [member] Member ifrs-full:NonadjustingEventsMember
656 Major Borrowings Transactions Member cnq:MajorBorrowingsTransactionsMember
657 Legal Entity [Axis] Axis dei:LegalEntityAxis
658 Entity [Domain] Member dei:EntityDomain
659 North West Redwater Partnership Member cnq:NorthWestRedwaterPartnershipMember
660 Joint ventures [axis] Axis ifrs-full:JointVenturesAxis
661 Entity's total for joint ventures [member] Member ifrs-full:EntitysTotalForJointVenturesMember
662 North West Redwater Partnership Member cnq:NorthWestRedwaterPartnershipMember
663 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
664 Borrowings by name Member ifrs-full:BorrowingsByNameMember
665 2.80% Series J Senior Secured Bonds Due June 2027 Member cnq:TwoPointEightZeroPercentSeriesJSeniorSecuredBondsDueJune2027Member
666 3.65% Series K Senior Secured Bonds Due June 2035 Member cnq:ThreePointSixFivePercentSeriesKSeniorSecuredBondsDueJune2035Member
667 4.25% Series F Senior Secured Bonds Due June 2029 Member cnq:FourPointTwoFivePercentSeriesFSeniorSecuredBondsDueJune2029Member
668 4.75% Percent Series G Senior Secured Bonds Due June 2037 Member cnq:FourPointSevenFivePercentSeriesGSeniorSecuredBondsDueJune2037Member
669 4.15% Series H Senior Secured Bonds Due June 2033 Member cnq:FourPointOneFivePercentSeriesHSeniorSecuredBondsDueJune2033Member
670 4.35% Series I Senior Secured Bonds Due January 2039 Member cnq:FourPointThreeFivePercentSeriesISeniorSecuredBondsDueJanuary2039Member
671 Syndicated credit facility Member cnq:SyndicatedCreditFacilityMember
672 Non-revolving term credit facility maturing February 2020 Member cnq:NonRevolvingTermCreditFacilityMaturingFebruary2020Member
673 Disclosure of joint ventures [line items] LineItems ifrs-full:DisclosureOfJointVenturesLineItems
674 Company's voting percent interest in joint venture Concept (Percent) For Period ifrs-full:ProportionOfVotingRightsHeldInJointVenture
675 Processing agreement, barrels of bitumen feedstock per day Concept (num:volumeItemType) For Period cnq:JointVentureProcessingAgreementBarrelsOfBitumenFeedstockProcessedPerDay
676 Processing agreement, barrels of bitumen feedstock per date for the Company Concept (num:volumeItemType) For Period cnq:JointVentureProcessingAgreementBarrelsOfBitumenFeedstockProcessedPerDayPortionRelatedToCompany
677 Processing agreement, barrels of bitumen feedstock per date for others Concept (num:volumeItemType) For Period cnq:JointVentureProcessingAgreementBarrelsOfBitumenFeedstockProcessedPerDayPortionRelatedToOthers
678 Processing agreement term Concept (xbrli:durationItemType) For Period cnq:JointVentureProcessingAgreementTerm
679 Facility capital cost budget for the Project Concept (Monetary) As Of Credit cnq:CommitmentsInRelationToJointVenturesFacilitiesCapitalCostBudget
680 Company's ownership interest in joint venture Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInJointVenture
681 Subordinated debt interest rate variable Concept (Percent) As Of cnq:CommitmentsInRelationToJointVenturesAdjustmentToInterestRateBasis
682 Debt to equity ratio Concept (Percent) For Period cnq:DebtToEquityRatioDebtCovenant
683 Subordinated debt contributed before accrued interest Concept (Monetary) As Of Debit cnq:DebtInstrumentsHeldBeforeAccruedInterest
684 Accrued interest Concept (Monetary) As Of Debit cnq:DebtInstrumentsHeldAccruedInterest
685 North West Redwater Partnership subordinated debt Concept (Monetary) As Of Debit ifrs-full:DebtInstrumentsHeld
686 Percent of pro rata share of debt company has committed paying to joint venture Concept (Percent) As Of cnq:CommitmentsInRelationToJointVenturesPercentageProRataShareOfMonthlyDebtCost
687 Term of commitment to joint venture Concept (xbrli:durationItemType) For Period cnq:CommitmentsInRelationToJointVenturesTerm
688 Prepaid service tolls Concept (Monetary) As Of Debit cnq:PrepaidServiceTolls
689 Bonds issued Concept (Monetary) As Of ifrs-full:NotionalAmount
690 Bonds issued, interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
691 Borrowings Concept (Monetary) As Of Credit ifrs-full:Borrowings
692 Maximum credit facility Concept (Monetary) As Of Credit cnq:LineOfCreditFacilityMaximumBorrowingCapacity1
693 2422404 - Disclosure - OTHER LONG-TERM ASSETS - Summary of Assets, Liabilities, Partners' Equity and Equity (Income) Loss (Details) Network

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694 Disclosure of joint ventures [table] Table

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695 Legal Entity [Axis] Axis dei:LegalEntityAxis
696 Entity [Domain] Member dei:EntityDomain
697 North West Redwater Partnership Member cnq:NorthWestRedwaterPartnershipMember
698 Joint ventures [axis] Axis ifrs-full:JointVenturesAxis
699 Entity's total for joint ventures [member] Member ifrs-full:EntitysTotalForJointVenturesMember
700 North West Redwater Partnership Member cnq:NorthWestRedwaterPartnershipMember
701 Disclosure of joint ventures [line items] LineItems ifrs-full:DisclosureOfJointVenturesLineItems
702 Current assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
703 Non-current assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssets
704 Current liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
705 Non-current liabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentLiabilities
706 Partners’ equity Concept (Monetary) As Of Credit ifrs-full:Equity
707 Equity loss (income) Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
708 2423402 - Disclosure - LONG-TERM DEBT - Summary of Long-term Debt (Details) Network

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709 Disclosure of detailed information about borrowings [table] Table

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710 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
711 Carrying amount Member ifrs-full:CarryingAmountMember
712 Gross carrying amount Member ifrs-full:GrossCarryingAmountMember
713 Original issue discounts, net Member cnq:OriginalIssuePremiumsDiscountsNetMember
714 Transaction costs Member cnq:DeferredFinancingCostsMember
715 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
716 Borrowings by name Member ifrs-full:BorrowingsByNameMember
717 Bank credit facilities Member cnq:CanadianCreditFacilitiesMember
718 3.05% debentures due June 19, 2019 Member cnq:MediumTermBorrowingsThreePointZeroFivePercentDebenturesDueJune2019Member
719 2.60% debentures due December 3, 2019 Member cnq:MediumTermBorrowingsTwoPointSixZeroPercentDebenturesDueDecember2019Member
720 2.05% debentures due June 1, 2020 Member cnq:MediumTermBorrowingsTwoPointZeroFivePercentDebenturesDueJune2020Member
721 2.89% debentures due August 14, 2020 Member cnq:MediumTermBorrowingsTwoPointEightNinePercentDebenturesDueAugust2020Member
722 3.31% debentures due February 11, 2022 Member cnq:MediumTermBorrowingsThreePointThreeOnePercentDebenturesDueFebruary2021Member
723 3.55% debentures due June 3, 2024 Member cnq:MediumTermBorrowingsThreePointFiveFivePercentDebenturesDueJune2024Member
724 3.42% debentures due December 1, 2026 Member cnq:MediumTermBorrowingsThreePointFourTwoPercentDebenturesDueDecember2026Member
725 4.85% debentures due May 30, 2047 Member cnq:MediumTermBorrowingsFourPointEightFivePercentDebenturesDueMay2047Member
726 Medium-term notes Member cnq:CanadianDollarDenominatedDebtMember
727 Bank credit facilities (December 31, 2018 - US$2,954 million; December 31, 2017 - US$1,839 million) Member cnq:USCreditFacilitiesMember
728 Commercial paper (December 31, 2018 - US$104 million; December 31, 2017 - US$500 million) Member cnq:CommercialPaper1Member
729 1.75% due January 15, 2018 (US$600 million) Member cnq:LongTermBorrowingsOnePointSevenFivePercentDueJanuary2018Member
730 5.90% due February 1, 2018 (US$400 million) Member cnq:LongTermBorrowingsFivePointNineZeroPercentDueFebruary2018Member
731 3.45% due November 15, 2021 (US$500 million) Member cnq:LongTermBorrowingsThreePointFourFivePercentDueNovember2021Member
732 2.95% due January 15, 2023 (US$1,000 million) Member cnq:LongTermBorrowingsTwoPointNineFivePercentDueJanuary2023Member
733 3.80% due April 15, 2024 (US$500 million) Member cnq:LongTermBorrowingsThreePointEightZeroPercentDueApril2024Member
734 3.90% due February 1, 2025 (US$600 million) Member cnq:LongTermBorrowingsThreePointNineZeroPercentDueFebruary2025Member
735 3.85% due June 1, 2027 (US$1,250 million) Member cnq:LongTermBorrowingsThreePointEightFivePercentDueJune2027Member
736 7.20% due January 15, 2032 (US$400 million) Member cnq:LongTermBorrowingsSevenPointTwoZeroPercentDueJanuary2032Member
737 6.45% due June 30, 2033 (US$350 million) Member cnq:LongTermBorrowingsSixPointFourFivePercentDueJune2033Member
738 5.85% due February 1, 2035 (US$350 million) Member cnq:LongTermBorrowingsFivePointEightFivePercentDueFebruary2035Member
739 6.50% due February 15, 2037 (US$450 million) Member cnq:LongTermBorrowingsSixPointFiveZeroPercentDueFebruary2037Member
740 6.25% due March 15, 2038 (US$1,100 million) Member cnq:LongTermBorrowingsSixPointTwoFivePercentDueMarch2038Member
741 6.75% due February 1, 2039 (US$400 million) Member cnq:LongTermBorrowingsSixPointSevenFivePercentDueFebruary2039Member
742 4.95% due June 1, 2047 (US$750 million) Member cnq:LongTermBorrowingsFourPointNineFivePercentDueJune2047Member
743 Long-term debt Member ifrs-full:LongtermBorrowingsMember
744 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
745 Borrowings, interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
746 Notional amount Concept (Monetary) As Of ifrs-full:NotionalAmount
747 Borrowings Concept (Monetary) As Of Credit ifrs-full:Borrowings
748 Less: current portion of commercial paper Concept (Monetary) As Of Credit ifrs-full:ShorttermBorrowings
749 Current portion of other long-term debt Concept (Monetary) As Of Credit ifrs-full:CurrentPortionOfLongtermBorrowings
750 Long-term debt Concept (Monetary) As Of Credit ifrs-full:LongtermBorrowings
751 2423403 - Disclosure - LONG-TERM DEBT - Narrative (Details) Network

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752 Disclosure of detailed information about borrowings [table] Table

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753 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
754 Borrowings by name Member ifrs-full:BorrowingsByNameMember
755 Bank credit facilities Member cnq:CreditFacilitiesMember
756 Term Credit Facility Member cnq:TermCreditFacilityMember
757 Demand credit facility Member cnq:DemandCreditFacilityMember
758 Non-revolving term credit facility maturing May 2020 Member cnq:NonRevolvingTermCreditFacilityMaturingMay2020Member
759 Non-revolving term credit facility maturing October 2020 Member cnq:NonRevolvingTermCreditFacilityMaturingOctober2020Member
760 Non-Revolving Term Credit Facility Maturing February 2019 Member cnq:NonRevolvingTermCreditFacilityMaturingFebruary20192Member
761 Non-revolving term credit facility maturing February 2020 Member cnq:NonRevolvingTermCreditFacilityMaturingFebruary2020Member
762 Commercial Paper Member cnq:CommercialPaper1Member
763 Revolving syndicated credit facility Member cnq:RevolvingSyndicatedCreditFacilityDueJune2019andJune2021Member
764 Revolving syndicated credit facility maturing June 2019 Member cnq:RevolvingSyndicatedCreditFacilityMaturingJune2019Member
765 Revolving syndicated credit facility maturing June 2021 Member cnq:RevolvingSyndicatedCreditFacilityMaturingJune2021Member
766 Revolving syndicated credit facility maturing June 2022 Member cnq:RevolvingSyndicatedCreditFacilityMaturingJune2022Member
767 Credit facilities and commercial paper Member cnq:CreditFacilitiesAndCommercialPaperMember
768 Long-term debt Member ifrs-full:LongtermBorrowingsMember
769 2.05% debentures due June 1, 2020 Member cnq:MediumTermBorrowingsTwoPointZeroFivePercentDebenturesDueJune2020Member
770 3.42% debentures due December 1, 2026 Member cnq:MediumTermBorrowingsThreePointFourTwoPercentDebenturesDueDecember2026Member
771 4.85% debentures due May 30, 2047 Member cnq:MediumTermBorrowingsFourPointEightFivePercentDebenturesDueMay2047Member
772 Medium-Term Borrowings Expiring August 2019 Member cnq:MediumTermBorrowingsExpiringAugust2019Member
773 1.75% due January 15, 2018 (US$600 million) Member cnq:LongTermBorrowingsOnePointSevenFivePercentDueJanuary2018Member
774 5.90% due February 1, 2018 (US$400 million) Member cnq:LongTermBorrowingsFivePointNineZeroPercentDueFebruary2018Member
775 5.70% due May 15, 2017 (US$1,100 million) Member cnq:LongTermBorrowingsFivePointSevenZeroPercentDueMay2017Member
776 2.95% due January 15, 2023 (US$1,000 million) Member cnq:LongTermBorrowingsTwoPointNineFivePercentDueJanuary2023Member
777 3.85% due June 1, 2027 (US$1,250 million) Member cnq:LongTermBorrowingsThreePointEightFivePercentDueJune2027Member
778 4.95% due June 1, 2047 (US$750 million) Member cnq:LongTermBorrowingsFourPointNineFivePercentDueJune2047Member
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789 Notional amount Concept (Monetary) As Of ifrs-full:NotionalAmount
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792 2423404 - Disclosure - LONG-TERM DEBT - Schedule of Debt Repayments (Details) Network

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803 2023 Member ifrs-full:LaterThanFourYearsAndNotLaterThanFiveYearsMember
804 Thereafter Member ifrs-full:LaterThanFiveYearsMember
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807 2425402 - Disclosure - OTHER LONG-TERM LIABILITIES - Schedule of other long-term liabilities (Details) Network

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814 Share-based compensation Concept (Monetary) As Of Credit ifrs-full:LiabilitiesFromSharebasedPaymentTransactions2011
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823 2425403 - Disclosure - OTHER LONG-TERM LIABILITIES - Asset Retirement Obligations (Details) Network

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824 Disclosure of other provisions [table] Table

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836 Liabilities acquired, net Concept (Monetary) For Period Credit ifrs-full:AcquisitionsThroughBusinessCombinationsOtherProvisions
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840 Change in discount rate Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughChangeInDiscountRateOtherProvisions
841 Foreign exchange adjustments Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesOtherProvisions
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843 2425404 - Disclosure - OTHER LONG-TERM LIABILITIES - Segmented Asset Retirement Obligations (Details) Network

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854 2425405 - Disclosure - OTHER LONG-TERM LIABILITIES - Share-Based Compensation (Details) Network

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862 Share-based compensation (recovery) expense Concept (Monetary) For Period Debit ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
863 Cash payment for stock options surrendered Concept (Monetary) For Period Credit ifrs-full:PaymentsOfOtherEquityInstruments
864 Transferred to common shares Concept (Monetary) For Period Debit cnq:LiabilitiesFromShareBasedPaymentTransactionsTransferredToCommonSharesThroughExerciseOfOptions
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868 Non-current liabilities from share-based payment arrangements Concept (Monetary) As Of Credit cnq:NonCurrentLiabilitiesFromShareBasedPaymentTransactions
869 2425406 - Disclosure - OTHER LONG-TERM LIABILITIES - Weighted Average Assumptions Used to Calculate Share-Based Compensation Liability (Details) Network

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870 Disclosure of terms and conditions of share-based payment arrangement [table] Table

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877 Share price Concept (Monetary) For Period ifrs-full:WeightedAverageSharePriceShareOptionsGranted
878 Expected volatility Concept (Percent) For Period ifrs-full:DescriptionOfExpectedVolatilityShareOptionsGranted
879 Expected dividend yield Concept (Percent) For Period ifrs-full:ExpectedDividendAsPercentageShareOptionsGranted
880 Risk free interest rate Concept (Percent) For Period ifrs-full:DescriptionOfRiskFreeInterestRateShareOptionsGranted
881 Expected forfeiture rate Concept (Percent) For Period cnq:ExpectedForfeitureAsPercentageShareOptionsGranted
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883 Intrinsic value of vested stock options Concept (Monetary) As Of Credit ifrs-full:IntrinsicValueOfLiabilitiesFromSharebasedPaymentTransactionsForWhichCounterpartysRightToCashOrOtherAssetsVested2011
884 2428402 - Disclosure - INCOME TAXES - Schedule Of Provision For Income Tax (Details) Network

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892 Current Abstract ifrs-full:CurrentTaxExpenseIncomeAndAdjustmentsForCurrentTaxOfPriorPeriodsAbstract
893 Current corporate income tax Concept (Monetary) For Period Debit cnq:CurrentCorporateIncomeTaxExpenseIncome
894 Current PRT - North Sea Concept (Monetary) For Period Debit cnq:CurrentPetroleumRevenueTaxExpenseIncome
895 Other taxes Concept (Monetary) For Period Debit cnq:CurrentOtherTaxExpenseIncome
896 Current income tax Concept (Monetary) For Period Debit ifrs-full:CurrentTaxExpenseIncome
897 Deferred Abstract ifrs-full:DeferredTaxExpenseIncomeAbstract
898 Deferred corporate income tax Concept (Monetary) For Period Debit cnq:DeferredCorporateIncomeTaxExpenseIncome
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900 Deferred income tax Concept (Monetary) For Period Debit ifrs-full:DeferredTaxExpenseIncome
901 Income tax expense (recovery) Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
902 2428403 - Disclosure - INCOME TAXES - Schedule of Provision For Income Tax Rate Reconciliation (Details) Network

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903 Implied Table Table

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*

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904 Income Taxes [Abstract] Abstract cnq:IncomeTaxesAbstract
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906 Canadian statutory income tax rate Concept (Percent) For Period ifrs-full:ApplicableTaxRate
907 Income tax provision at statutory rate Concept (Monetary) For Period Debit ifrs-full:TaxExpenseIncomeAtApplicableTaxRate
908 UK PRT and other taxes Concept (Monetary) For Period Debit cnq:TaxEffectOfPetroleumRevenueAndOtherTaxes
909 Impact of deductible UK PRT and other taxes on corporate income tax Concept (Monetary) For Period Credit cnq:TaxEffectOfDeductiblePetroleumRevenueAndOtherTaxesOnCorporateIncomeTax
910 Foreign and domestic tax rate differentials Concept (Monetary) For Period Debit ifrs-full:TaxEffectOfForeignTaxRates
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912 Stock options exercised for common shares Concept (Monetary) For Period Credit cnq:TaxEffectOfExerciseOfOptions
913 Income tax rate and other legislative changes Concept (Monetary) For Period Debit ifrs-full:TaxEffectFromChangeInTaxRate
914 Non-taxable gain on corporate acquisitions Concept (Monetary) For Period Credit cnq:TaxEffectOfGainsFromBusinessCombinationExemptFromTaxation
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917 Other Concept (Monetary) For Period Debit ifrs-full:OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome
918 Income tax expense (recovery) Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
919 2428404 - Disclosure - INCOME TAXES - Summary of Major Temporary Differences (Details) Network

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920 Disclosure of temporary difference, unused tax losses and unused tax credits [table] Table

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 ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
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937 2428405 - Disclosure - INCOME TAXES - Summary of Movements in Deferred Tax Assets and Liabilities (Details) Network

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954 2428406 - Disclosure - INCOME TAXES - Summary of Net Deferred Income Tax Liability (Details) Network

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955 Implied Table Table

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959 Deferred income tax expense (recovery) Concept (Monetary) For Period ifrs-full:DeferredTaxExpenseIncomeRecognisedInProfitOrLoss
960 Deferred income tax (recovery) expense included in other comprehensive income Concept (Monetary) For Period ifrs-full:IncomeTaxRelatingToComponentsOfOtherComprehensiveIncome
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964 2428407 - Disclosure - INCOME TAXES - Narrative (Details) Network

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983 2431402 - Disclosure - SHARE CAPITAL - Outstanding Common Shares (Details) Network

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984 Disclosure of classes of share capital [table] Table

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997 Issued upon exercise of stock options (in shares) Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsExercisedInSharebasedPaymentArrangement
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1001 Purchase of common shares under Normal Course Issuer Bid Concept (Monetary) For Period Credit cnq:StockRepurchasedAndRetiredDuringPeriodValue1
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1003 Balance – end of year Concept (Monetary) As Of Credit ifrs-full:Equity
1004 2431403 - Disclosure - SHARE CAPITAL - Narrative (Details) Network

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1005 Disclosure of terms and conditions of share-based payment arrangement [table] Table

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1027 Vesting term Concept (xbrli:durationItemType) For Period cnq:ShareBasedCompensationArrangementbySharebasedPaymentAwardAwardVestingPeriod2
1028 Shares that may be reserved for issuance as a percentage of common shares outstanding Concept (Percent) As Of cnq:NumberOfSharesAuthorisedInShareBasedPaymentArrangementAsAPercentageOfCommonSharesOutstanding
1029 2431404 - Disclosure - SHARE CAPITAL - Stock Option Activity (Details) Network

*

*

 http://www.cnrl.com/role/ShareCapitalStockOptionActivityDetails
1030 Implied Table Table

*

*

 implied:Table
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1033 Stock options granted (in shares) Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsGrantedInSharebasedPaymentArrangement
1034 Stock options surrendered for cash settlement (in shares) Concept (Decimal) For Period cnq:NumberOfShareOptionsSurrenderedForCashInSharebasedPaymentArrangement
1035 Stock options exercised for common shares (in shares) Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsExercisedInSharebasedPaymentArrangement
1036 Stock options forfeited (in shares) Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement
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1038 Stock options exercisable (in shares) Concept (Decimal) As Of ifrs-full:NumberOfShareOptionsExercisableInSharebasedPaymentArrangement
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1045 Weighted average exercise price, options exercisable (in CAD per share) Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement
1046 2431405 - Disclosure - SHARE CAPITAL - Range of Exercise Prices of Stock Options (Details) Network

*

*

 http://www.cnrl.com/role/ShareCapitalRangeOfExercisePricesOfStockOptionsDetails
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 ifrs-full:DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable
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1065 Stock options exercisable (in shares) Concept (Decimal) As Of ifrs-full:NumberOfShareOptionsExercisableInSharebasedPaymentArrangement
1066 Weighted average exercise price, options exercisable (in CAD per share) Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement
1067 2434402 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) Network

*

*

 http://www.cnrl.com/role/AccumulatedOtherComprehensiveIncomeLossDetails
1068 Implied Table Table

*

*

 implied:Table
1069 Analysis Of Other Comprehensive Income By Item [Abstract] Abstract cnq:AnalysisOfOtherComprehensiveIncomeByItemAbstract
1070 Derivative financial instruments designated as cash flow hedges Concept (Monetary) As Of Credit cnq:AccumulatedOtherComprehensiveIncomeNetOfTaxDerivativeInstrumentsDesignatedAsCashFlowHedges
1071 Foreign currency translation adjustment Concept (Monetary) As Of Credit cnq:AccumulatedOtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation
1072 Accumulated other comprehensive income (loss) Concept (Monetary) As Of Credit ifrs-full:AccumulatedOtherComprehensiveIncome
1073 2437402 - Disclosure - CAPITAL DISCLOSURES (Details) Network

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*

 http://www.cnrl.com/role/CapitalDisclosuresDetails
1074 Disclosure of objectives, policies and processes for managing capital [table] Table

*

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 ifrs-full:DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalTable
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1080 Debt to book capitalization Concept (Percent) For Period cnq:DebtToBookCapitalizationRatio
1081 Long-term debt, net Concept (Monetary) As Of Credit cnq:BorrowingsNetOfCashAndCashEquivalents
1082 Total shareholders’ equity Concept (Monetary) As Of Credit ifrs-full:Equity
1083 Debt to book capitalization Concept (Percent) For Period cnq:DebtInstrumentDebtToBookCapitalizationRatio
1084 2440402 - Disclosure - NET EARNINGS (LOSS) PER COMMON SHARE - Schedule of Basic and Diluted Net Earnings (Loss) per Common Share (Details) Network

*

*

 http://www.cnrl.com/role/NetEarningsLossPerCommonShareScheduleOfBasicAndDilutedNetEarningsLossPerCommonShareDetails
1085 Implied Table Table

*

*

 implied:Table
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1087 Weighted average ordinary shares and adjusted weighted average ordinary shares [abstract] Abstract ifrs-full:WeightedAverageSharesAndAdjustedWeightedAverageSharesAbstract
1088 Weighted average common shares outstanding – basic (thousands of shares) Concept (Shares) For Period ifrs-full:WeightedAverageShares
1089 Effect of dilutive stock options (thousands of shares) Concept (Shares) For Period ifrs-full:DilutiveEffectOfShareOptionsOnNumberOfOrdinaryShares
1090 Weighted average common shares outstanding – diluted (thousands of shares) Concept (Shares) For Period ifrs-full:AdjustedWeightedAverageShares
1091 Net earnings (loss) Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
1092 Net earnings (loss) per common share - basic (in CAD per share) Concept (Share) For Period ifrs-full:BasicEarningsLossPerShare
1093 Net earnings (loss) per common share - diluted (in CAD per share) Concept (Share) For Period ifrs-full:DilutedEarningsLossPerShare
1094 2440403 - Disclosure - NET EARNINGS (LOSS) PER COMMON SHARE - Narrative (Details) Network

*

*

 http://www.cnrl.com/role/NetEarningsLossPerCommonShareNarrativeDetails
1095 Implied Table Table

*

*

 implied:Table
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1097 Potentially anti-dilutive securities (in shares) Concept (Shares) For Period cnq:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount1
1098 2443402 - Disclosure - INTEREST AND OTHER FINANCING EXPENSE (Details) Network

*

*

 http://www.cnrl.com/role/InterestAndOtherFinancingExpenseDetails
1099 Implied Table Table

*

*

 implied:Table
1100 Borrowing costs [abstract] Abstract ifrs-full:BorrowingCostsAbstract
1101 Long-term debt Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnBorrowings
1102 Less: amounts capitalized on qualifying assets Concept (Monetary) For Period ifrs-full:BorrowingCostsCapitalised
1103 Total interest and other financing expense Concept (Monetary) For Period Debit ifrs-full:FinanceCosts
1104 Total interest income Concept (Monetary) For Period Credit ifrs-full:FinanceIncome
1105 Net interest and other financing expense Concept (Monetary) For Period Credit ifrs-full:FinanceIncomeCost
1106 2446402 - Disclosure - FINANCIAL INSTRUMENTS - Carrying amounts of financial instruments by category (Details) Network

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*

 http://www.cnrl.com/role/FinancialInstrumentsCarryingAmountsOfFinancialInstrumentsByCategoryDetails
1107 Disclosure of detailed information about financial instruments [table] Table

*

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 ifrs-full:DisclosureOfFinancialInstrumentsTable
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1128 Financial assets, derivatives used for hedging Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncome
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1136 2446403 - Disclosure - FINANCIAL INSTRUMENTS - Carrying amounts and fair values of financial instruments (Details) Network

*

*

 http://www.cnrl.com/role/FinancialInstrumentsCarryingAmountsAndFairValuesOfFinancialInstrumentsDetails
1137 Disclosure of detailed information about financial instruments [table] Table

*

*

 ifrs-full:DisclosureOfFinancialInstrumentsTable
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1147 Interest rate types [member] Member ifrs-full:InterestRateTypesMember
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1149 Levels of fair value hierarchy [axis] Axis ifrs-full:LevelsOfFairValueHierarchyAxis
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1152 Level 2 Member ifrs-full:Level2OfFairValueHierarchyMember
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1158 Financial liabilities, at fair value Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValue
1159 2446404 - Disclosure - FINANCIAL INSTRUMENTS - Carrying amounts and reconciliation of derivative financial instruments (Details) Network

*

*

 http://www.cnrl.com/role/FinancialInstrumentsCarryingAmountsAndReconciliationOfDerivativeFinancialInstrumentsDetails
1160 Disclosure of detailed information about hedging instruments [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsTable
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1165 AECO basis swap Member cnq:AECOBasisSwapMember
1166 AECO fixed price swaps Member cnq:AECOFixedPriceSwapMember
1167 Cross currency swaps Member ifrs-full:CurrencySwapContractMember
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1173 Cash flow hedges, asset (liability) Concept (Monetary) As Of Debit cnq:DerivativeFinancialAssetsLiabilitiesHeldForHedging
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1175 Current portion of other long-term assets Concept (Monetary) As Of Debit ifrs-full:CurrentDerivativeFinancialAssets
1176 Current portion of other long-term liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentDerivativeFinancialLiabilities
1177 Other long-term assets Concept (Monetary) As Of Debit cnq:NonCurrentDerivativeFinancialAssetsLiabilities
1178 Gain (loss) on hedge ineffectiveness Concept (Monetary) For Period Credit ifrs-full:GainLossOnHedgeIneffectivenessRecognisedInProfitOrLoss
1179 Financial liabilities at amortised cost Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtAmortisedCost
1180 2446405 - Disclosure - FINANCIAL INSTRUMENTS - Estimated fair values of derivative financial instruments included in risk management asset (Details) Network

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*

 http://www.cnrl.com/role/FinancialInstrumentsEstimatedFairValuesOfDerivativeFinancialInstrumentsIncludedInRiskManagementAssetDetails
1181 Implied Table Table

*

*

 implied:Table
1182 Financial Instruments [Abstract] Abstract cnq:FinancialInstrumentsAbstract
1183 Reconciliation Of Changes In Derivative Financial Assets (Liabilities), Net [Roll Forward] Abstract cnq:ReconciliationOfChangesInDerivativeFinancialAssetsLiabilitiesNetRollForward
1184 Derivative financial asset (liability), net Concept (Monetary) As Of Debit cnq:DerivativeFinancialAssetsLiabilitiesNet
1185 Net change in fair value of outstanding derivatives financial instruments recognized in: Risk management activities Concept (Monetary) For Period Credit cnq:GainLossesOnChangeInFairValueOfUnsettledDerivatives
1186 Net change in fair value of outstanding derivatives financial instruments recognized in: Foreign exchange Concept (Monetary) For Period Credit cnq:GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLossSettledAndUnsettledDerivativeHedgingInstruments
1187 Net change in fair value of outstanding derivatives financial instruments recognized in: Other comprehensive income (loss) Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnCashFlowHedgesBeforeTax
1188 Derivative financial asset (liability), net Concept (Monetary) As Of Debit cnq:DerivativeFinancialAssetsLiabilitiesNet
1189 Asset (liability), included in current portion of other long-term (liabilities) assets Concept (Monetary) As Of Debit cnq:CurrentDerivativeFinancialAssetsLiabilities
1190 Asset (liability), included in other long-term assets Concept (Monetary) As Of Debit cnq:NonCurrentDerivativeFinancialAssetsLiabilities
1191 2446406 - Disclosure - FINANCIAL INSTRUMENTS - Net (gains) losses from risk management activities (Details) Network

*

*

 http://www.cnrl.com/role/FinancialInstrumentsNetGainsLossesFromRiskManagementActivitiesDetails
1192 Implied Table Table

*

*

 implied:Table
1193 Financial Instruments [Abstract] Abstract cnq:FinancialInstrumentsAbstract
1194 Net realized risk management (gain) loss Concept (Monetary) For Period Credit cnq:GainLossesOnChangeInFairValueOfSettledDerivatives
1195 Net unrealized risk management (gain) loss Concept (Monetary) For Period Credit cnq:GainLossesOnChangeInFairValueOfUnsettledDerivatives
1196 Gains (losses) on change in fair value of derivatives Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnChangeInFairValueOfDerivatives
1197 Gain (Losses) On Change In Fair Value Of Derivatives Not Designated As Hedging Instruments And Gain (Loss) On Hedge Ineffectiveness Concept (Monetary) For Period Credit cnq:GainLossesOnChangeInFairValueOfDerivativesNotDesignatedAsHedgingInstrumentsAndGainLossOnHedgeIneffectiveness
1198 2446407 - Disclosure - FINANCIAL INSTRUMENTS - Commodity price risk management (Details) Network

*

*

 http://www.cnrl.com/role/FinancialInstrumentsCommodityPriceRiskManagementDetails
1199 Disclosure of detailed information about hedging instruments [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsTable
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1209 AECO Fixed Price Swap, Apr 2019 to Oct 2019 Member cnq:AECOFixedPriceSwapAprilTwoThousandNineteenToOctoberTwoThousandNineteenMember
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1211 Risks [member] Member ifrs-full:TypesOfRisksMember
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1213 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
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1216 Disclosure of detailed information about hedging instruments [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems
1217 Oil volume per day Concept (Decimal) For Period cnq:DerivativeFinancialInstrumentVolumeRateCrudeOil
1218 Natural gas energy per day Concept (Decimal) For Period cnq:DerivativeFinancialInstrumentVolumeRateNaturalGas
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1220 Average price of hedging instrument Concept (Decimal) As Of ifrs-full:AveragePriceOfHedgingInstrument
1221 2446408 - Disclosure - FINANCIAL INSTRUMENTS - Foreign currency exchange rate risk management (Details) Network

*

*

 http://www.cnrl.com/role/FinancialInstrumentsForeignCurrencyExchangeRateRiskManagementDetails
1222 Disclosure of detailed information about hedging instruments [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsTable
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1226 Forward contracts Member ifrs-full:ForwardContractMember
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1228 All Currencies [Domain] Member currency:AllCurrenciesDomain
1229 US Member currency:USD
1230 CAD Member currency:CAD
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1232 Risks [member] Member ifrs-full:TypesOfRisksMember
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1234 Types of hedges [axis] Axis ifrs-full:TypesOfHedgesAxis
1235 Hedges [member] Member ifrs-full:TypesOfHedgesMember
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1237 Hedging instruments [axis] Axis ifrs-full:HedgingInstrumentsAxis
1238 Hedging instruments [member] Member ifrs-full:HedgingInstrumentsMember
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1240 Currency swap contract, term through March 2038 Member cnq:CurrencySwapContractTermThroughMarch2038Member
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1242 Disclosure of detailed information about hedging instruments [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems
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1244 Exchange rate (US$/C$) Concept (Decimal) For Period ifrs-full:AverageForeignExchangeRate
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1248 2446409 - Disclosure - FINANCIAL INSTRUMENTS - Financial instrument sensitivities (Details) Network

*

*

 http://www.cnrl.com/role/FinancialInstrumentsFinancialInstrumentSensitivitiesdetails
1249 Disclosure of detailed information about financial instruments [table] Table

*

*

 ifrs-full:DisclosureOfFinancialInstrumentsTable
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1274 2446410 - Disclosure - FINANCIAL INSTRUMENTS - Counterparty credit risk management (Details) Network

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*

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1275 Disclosure of detailed information about financial instruments [table] Table

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*

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1282 2446411 - Disclosure - FINANCIAL INSTRUMENTS - Maturity dates for financial liabilities (Details) Network

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 http://www.cnrl.com/role/FinancialInstrumentsMaturityDatesForFinancialLiabilitiesDetails
1283 Disclosure of detailed information about financial instruments [table] Table

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1302 2449402 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details) Network

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1327 2452402 - Disclosure - SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION - Supplemental Schedule Of Cash Flow Information (Details) Network

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1360 2452403 - Disclosure - SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION - Liabilities Arising From Financing Activities (Details) Network

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*

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1373 2455402 - Disclosure - SEGMENTED INFORMATION - Narrative (Details) Network

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1374 Implied Table Table

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1377 2455403 - Disclosure - SEGMENTED INFORMATION - Operating Segments Earnings (Details) Network

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1419 2455404 - Disclosure - SEGMENTED INFORMATION - Capital Expenditures (Details) Network

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1420 Disclosure of operating segments [table] Table

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1449 2455405 - Disclosure - SEGMENTED INFORMATION - Segmented Assets (Details) Network

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1465 2458402 - Disclosure - REMUNERATION OF DIRECTORS AND SENIOR MANAGEMENT (Details) Network

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 http://www.cnrl.com/role/RemunerationOfDirectorsAndSeniorManagementDetails
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1477 2459402 - Disclosure - SUPPLEMENTARY OIL & GAS INFORMATION (Unaudited) - Twelve Month Average Benchmark Prices (Details) Network

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1503 2459403 - Disclosure - SUPPLEMENTARY OIL & GAS INFORMATION (Unaudited) - Proved and Proved Developed Oil and Natural Gas Reserves, Net of Royalties (Details) Network

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1529 2459404 - Disclosure - SUPPLEMENTARY OIL & GAS INFORMATION (Unaudited) - Proved and Proved Developed Natural Gas Reserve Quantities (Details) Network

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1537 North Sea Member cnq:NorthSeaMember
1538 Offshore Africa Member cnq:OffshoreAfricaMember
1539 Reserve Quantities [Line Items] LineItems srt:ReserveQuantitiesLineItems
1540 Proved Developed And Undeveloped Reserves [Roll Forward] Abstract cnq:ProvedDevelopedAndUndevelopedReserves1RollForward
1541 Proved reserves, net, beginning balance Concept (num:volumeItemType) As Of srt:ProvedDevelopedAndUndevelopedReservesNet
1542 Extensions and discoveries (in Bcf) Concept (num:volumeItemType) For Period srt:ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
1543 Improved recovery (in Bcf) Concept (num:volumeItemType) For Period srt:ProvedDevelopedAndUndevelopedReservesImprovedRecovery
1544 Purchases of reserves in place (in Bcf) Concept (num:volumeItemType) For Period srt:ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace
1545 Sales of reserves in place (in Bcf) Concept (num:volumeItemType) For Period srt:ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace
1546 Production (in Bcf) Concept (num:volumeItemType) For Period srt:ProvedDevelopedAndUndevelopedReservesProduction
1547 Economic revisions due to prices (in Bcf) Concept (num:volumeItemType) For Period cnq:ProvedDevelopedAndUndevelopedReservesEconomicRevisionsDueToPrices
1548 Revisions of prior estimates (in Bcf) Concept (num:volumeItemType) For Period srt:ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
1549 Proved reserves, net, ending balance Concept (num:volumeItemType) As Of srt:ProvedDevelopedAndUndevelopedReservesNet
1550 Net proved developed reserves (in Bcf) Concept (num:volumeItemType) As Of srt:ProvedDevelopedReservesVolume
1551 Change in proved developed and undeveloped reserves, net (in Bcf) Concept (num:volumeItemType) For Period srt:ProvedDevelopedAndUndevelopedReservesNetPeriodIncreaseDecrease
1552 2459405 - Disclosure - SUPPLEMENTARY OIL & GAS INFORMATION (Unaudited) - Capitalized Costs Related to Crude Oil and Natural Gas Activities (Details) Network

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 http://www.cnrl.com/role/SupplementaryOilGasInformationUnauditedCapitalizedCostsRelatedToCrudeOilAndNaturalGasActivitiesDetails
1553 Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Table] Table

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 cnq:CapitalizedCostsRelatingToOilAndGasProducingActivitiesByGeographicArea1Table
1554 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
1555 Geographical areas Member ifrs-full:GeographicalAreasMember
1556 North America Member srt:NorthAmericaMember
1557 North Sea Member cnq:NorthSeaMember
1558 Offshore Africa Member cnq:OffshoreAfricaMember
1559 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
1560 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
1561 Oil and gas assets Member ifrs-full:OilAndGasAssetsMember
1562 Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items] LineItems cnq:CapitalizedCostsRelatingToOilAndGasProducingActivitiesByGeographicArea1LineItems
1563 Capitalized costs, proved properties Concept (Monetary) As Of Debit cnq:CapitalizedCostsProvedProperties1
1564 Capitalized costs, unproved properties Concept (Monetary) As Of Debit cnq:CapitalizedCostsUnprovedProperties1
1565 Capitalized costs, gross Concept (Monetary) As Of Debit cnq:CapitalizedCostsOilAndGasProducingActivitiesGross1
1566 Less: accumulated depletion and depreciation Concept (Monetary) As Of Credit cnq:CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceRelatingToOilAndGasProducingActivities1
1567 Net capitalized costs Concept (Monetary) As Of Debit cnq:CapitalizedCostsOilAndGasProducingActivitiesNet
1568 2459406 - Disclosure - SUPPLEMENTARY OIL & GAS INFORMATION (Unaudited) - Costs Incurred in Crude Oil and Natural Gas Activities (Details) Network

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 http://www.cnrl.com/role/SupplementaryOilGasInformationUnauditedCostsIncurredInCrudeOilAndNaturalGasActivitiesDetails
1569 Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Table] Table

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 cnq:CostsIncurredInOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities1Table
1570 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
1571 Geographical areas Member ifrs-full:GeographicalAreasMember
1572 North Sea Member cnq:NorthSeaMember
1573 Offshore Africa Member cnq:OffshoreAfricaMember
1574 North America Member srt:NorthAmericaMember
1575 Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items] LineItems cnq:CostsIncurredInOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities1LineItems
1576 Property acquisitions, proved Concept (Monetary) For Period Debit cnq:CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves1
1577 Property acquisitions, unproved Concept (Monetary) For Period Debit cnq:CostsIncurredAcquisitionOfUnprovedOilAndGasProperties1
1578 Exploration Concept (Monetary) For Period Debit ifrs-full:ExpenseArisingFromExplorationForAndEvaluationOfMineralResources
1579 Development Concept (Monetary) For Period Debit cnq:CostsIncurredDevelopmentCosts1
1580 Costs incurred Concept (Monetary) For Period Debit cnq:CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities1
1581 2459407 - Disclosure - SUPPLEMENTARY OIL & GAS INFORMATION (Unaudited) - Results of Operations from Crude Oil and Natural Gas Producing Activities (Details) Network

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 http://www.cnrl.com/role/SupplementaryOilGasInformationUnauditedResultsOfOperationsFromCrudeOilAndNaturalGasProducingActivitiesDetails
1582 Supplementary Oil & Gas Information [Table] Table

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 cnq:SupplementaryOilGasInformationTable
1583 Products and services [axis] Axis ifrs-full:ProductsAndServicesAxis
1584 Products and services Member ifrs-full:ProductsAndServicesMember
1585 Oil And Gas Member cnq:OilAndGas1Member
1586 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
1587 Geographical areas Member ifrs-full:GeographicalAreasMember
1588 North America Member srt:NorthAmericaMember
1589 North Sea Member cnq:NorthSeaMember
1590 Offshore Africa Member cnq:OffshoreAfricaMember
1591 Supplementary Oil & Gas Information [Line Items] LineItems cnq:SupplementaryOilGasInformationLineItems
1592 Crude oil and natural gas revenue, net of royalties, blending and feedstock costs Concept (Monetary) For Period Credit ifrs-full:Revenue
1593 Production Concept (Monetary) For Period Debit cnq:CostOfSalesProductionExpense
1594 Transportation Concept (Monetary) For Period Debit cnq:CostOfSalesTransportationBlendingAndFeedstockExpense
1595 Depletion, depreciation and amortization Concept (Monetary) For Period Debit ifrs-full:DepreciationAndAmortisationExpense
1596 Asset retirement obligation accretion Concept (Monetary) For Period Debit cnq:DecommissioningRestorationAndRehabilitationCostsArisingFromPassageOfTIme
1597 Petroleum revenue tax Concept (Monetary) For Period Debit ifrs-full:TaxExpenseOtherThanIncomeTaxExpense
1598 Income tax Concept (Monetary) For Period Debit ifrs-full:CurrentTaxExpenseIncome
1599 Results of operations Concept (Monetary) For Period Credit ifrs-full:GrossProfit
1600 Exploration and evaluation assets, derecognition due to withdrawal Concept (Monetary) As Of Credit cnq:ExplorationandEvaluationAssetsDerecognitionDuetoWithdrawal
1601 2459408 - Disclosure - SUPPLEMENTARY OIL & GAS INFORMATION (Unaudited) - Future Net Cash Flows Relating to Proved Crude Oil and Natural Gas Reserves (Details) Network

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 http://www.cnrl.com/role/SupplementaryOilGasInformationUnauditedFutureNetCashFlowsRelatingToProvedCrudeOilAndNaturalGasReservesDetails
1602 Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Table] Table

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 srt:DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesTable
1603 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
1604 Geographical areas Member ifrs-full:GeographicalAreasMember
1605 North America Member srt:NorthAmericaMember
1606 North Sea Member cnq:NorthSeaMember
1607 Offshore Africa Member cnq:OffshoreAfricaMember
1608 Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] LineItems srt:DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesLineItems
1609 Future cash inflows Concept (Monetary) As Of Debit srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows
1610 Future production costs Concept (Monetary) As Of Credit srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts
1611 Future development costs and asset retirement obligations Concept (Monetary) As Of Credit cnq:FutureNetCashFlowsRelatingtoProvedOilandGasReservesDevelopmentCostsandAssetRetirementObligations
1612 Future income taxes Concept (Monetary) As Of Credit srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense
1613 Future net cash flows Concept (Monetary) As Of Debit srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows
1614 10% annual discount for timing of future cash flows Concept (Monetary) As Of Credit srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows
1615 Standardized measure of future net cash flows Concept (Monetary) As Of Debit srt:StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
1616 2459409 - Disclosure - SUPPLEMENTARY OIL & GAS INFORMATION (Unaudited) - Sources of Change in the Standardized Measure of Discounted Future Net Cash Flows (Details) Network

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 http://www.cnrl.com/role/SupplementaryOilGasInformationUnauditedSourcesOfChangeInStandardizedMeasureOfDiscountedFutureNetCashFlowsDetails
1617 Implied Table Table

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 implied:Table
1618 Extractive Industries [Abstract] Abstract srt:ExtractiveIndustriesAbstract
1619 Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves 1 [Roll Forward] Abstract srt:IncreaseDecreaseInStandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesRollForward
1620 Sales of crude oil and natural gas produced, net of production costs Concept (Monetary) For Period Credit srt:SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts
1621 Net changes in sales prices and production costs Concept (Monetary) For Period Debit srt:NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts
1622 Extensions, discoveries and improved recovery Concept (Monetary) For Period Debit srt:ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts
1623 Changes in estimated future development costs Concept (Monetary) For Period Debit srt:IncreaseDecreaseInEstimatedFutureDevelopmentCosts
1624 Purchases of proved reserves in place Concept (Monetary) For Period Debit srt:IncreaseDueToPurchasesOfMineralsInPlace
1625 Sales of proved reserves in place Concept (Monetary) For Period Credit srt:DecreaseDueToSalesOfMineralsInPlace
1626 Revisions of previous reserve estimates Concept (Monetary) For Period Debit srt:RevisionsOfPreviousQuantityEstimates
1627 Accretion of discount Concept (Monetary) For Period Credit srt:StandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesAccretionOfDiscount
1628 Changes in production timing and other Concept (Monetary) For Period Debit srt:StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOther
1629 Net change in income taxes Concept (Monetary) For Period Debit srt:IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves
1630 Net change Concept (Monetary) For Period srt:StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease
1631 Balance - beginning of year Concept (Monetary) As Of Debit srt:StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
1632 Balance - end of year Concept (Monetary) As Of Debit srt:StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves

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