OBSIDIAN ENERGY LTD. (SEC Filing Page | XBRL Cloud Viewer | XBRL Instance)

Line Label Object Class Period Type Balance Report ElementName
1 1001 - Document - Document and Entity Information Network

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http://imetrix.edgar-online.com/taxonomy/role/DocumentandEntityInformation
2 Document Information [Table] Table

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3 Legal entity [axis] Axis dei:LegalEntityAxis
4 Entity [Domain] Member dei:EntityDomain
5 Document Information [Line Items] LineItems dei:DocumentInformationLineItems
6 Document Type Concept (Submission Type) For Period dei:DocumentType
7 Amendment Flag Concept (Yes/No) For Period dei:AmendmentFlag
8 Document Period End Date Concept (Date) For Period dei:DocumentPeriodEndDate
9 Document Fiscal Year Focus Concept (Year) For Period dei:DocumentFiscalYearFocus
10 Document Fiscal Period Focus Concept (Fiscal Period) For Period dei:DocumentFiscalPeriodFocus
11 Trading Symbol Concept (Text/String) For Period dei:TradingSymbol
12 Entity Registrant Name Concept (Text/String) For Period dei:EntityRegistrantName
13 Entity Central Index Key Concept (CIK Number) For Period dei:EntityCentralIndexKey
14 Current Fiscal Year End Date Concept (Month/Day) For Period dei:CurrentFiscalYearEndDate
15 Entity Current Reporting Status Concept (Yes/No) For Period dei:EntityCurrentReportingStatus
16 Entity Emerging Growth Company Concept (Yes/No) For Period dei:EntityEmergingGrowthCompany
17 Entity Ex Transition Period Concept (Yes/No) For Period dei:EntityExTransitionPeriod
18 Entity Common Stock, Shares Outstanding Concept (Shares) As Of dei:EntityCommonStockSharesOutstanding
19 1003 - Statement - Consolidated Balance Sheets Network

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http://imetrix.edgar-online.com/taxonomy/role/StatementOfFinancialPositionCurrentNonCurrent-210000
20 Statement [table] Table

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21 Legal entity [axis] Axis dei:LegalEntityAxis
22 Entity [Domain] Member dei:EntityDomain
23 Statement [LineItems] LineItems obe:StatementLineItems
24 Assets Abstract ifrs-full:AssetsAbstract
25 Current Abstract ifrs-full:CurrentAssetsAbstract
26 Cash Concept (Monetary) As Of Debit ifrs-full:Cash
27 Accounts receivable Concept (Monetary) As Of Debit ifrs-full:CurrentTradeReceivables
28 Risk management Concept (Monetary) As Of Debit ifrs-full:CurrentFinancialAssets
29 Other Concept (Monetary) As Of Debit ifrs-full:OtherCurrentAssets
30 Deferred funding asset Concept (Monetary) As Of Debit obe:CurrentDeferredFundingAsset
31 Assets held for sale Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners
32 Total current assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
33 Non-current Abstract ifrs-full:NoncurrentAssetsAbstract
34 Property, plant and equipment Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
35 Total non-current assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssets
36 Total assets Concept (Monetary) As Of Debit ifrs-full:Assets
37 Liabilities and Shareholders' Equity Abstract ifrs-full:EquityAndLiabilitiesAbstract
38 Current Abstract ifrs-full:CurrentLiabilitiesAbstract
39 Bank overdraft Concept (Monetary) As Of Credit obe:BankOverdraft
40 Accounts payable and accrued liabilities Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayables
41 Current portion of long-term debt Concept (Monetary) As Of Credit ifrs-full:CurrentPortionOfLongtermBorrowings
42 Current portion of provisions Concept (Monetary) As Of Credit ifrs-full:CurrentProvisions
43 Risk management Concept (Monetary) As Of Credit ifrs-full:CurrentFinancialLiabilities
44 Liabilities related to assets held for sale Concept (Monetary) As Of Credit ifrs-full:LiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale
45 Total current liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
46 Non-current Abstract ifrs-full:NoncurrentLiabilitiesAbstract
47 Long-term debt Concept (Monetary) As Of Credit ifrs-full:LongtermBorrowings
48 Provisions Concept (Monetary) As Of Credit ifrs-full:NoncurrentProvisions
49 Risk management Concept (Monetary) As Of Credit ifrs-full:NoncurrentFinancialLiabilities
50 Other non-current liabilities Concept (Monetary) As Of Credit ifrs-full:OtherNoncurrentLiabilities
51 Total liabilities Concept (Monetary) As Of Credit ifrs-full:Liabilities
52 Shareholders' equity Abstract ifrs-full:EquityAbstract
53 Shareholders' capital Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
54 Other reserves Concept (Monetary) As Of Credit ifrs-full:OtherReserves
55 Deficit Concept (Monetary) As Of Credit ifrs-full:RetainedEarnings
56 Total shareholders' equity Concept (Monetary) As Of Credit ifrs-full:Equity
57 Total liabilities and shareholders' equity Concept (Monetary) As Of Credit ifrs-full:EquityAndLiabilities
58 1004 - Statement - Consolidated Statements of Income (Loss) Network

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59 Statement [table] Table

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60 Legal entity [axis] Axis dei:LegalEntityAxis
61 Entity [Domain] Member dei:EntityDomain
62 Statement [LineItems] LineItems obe:StatementLineItems
63 Oil and natural gas sales and other income Concept (Monetary) For Period Credit ifrs-full:RevenueFromSaleOfOilAndGasProducts
64 Royalties Concept (Monetary) For Period Debit ifrs-full:RoyaltyExpense
65 Gross Revenue Concept (Monetary) For Period Credit obe:RevenueNetOfRoyaltyExpense
66 Risk management gain (loss) Concept (Monetary) For Period Credit obe:RiskManagementGainLoss
67 Total revenue Concept (Monetary) For Period Credit ifrs-full:Revenue
68 Expenses Abstract ifrs-full:ExpenseByNatureAbstract
69 Operating Concept (Monetary) For Period Debit ifrs-full:OperatingExpense
70 Transportation Concept (Monetary) For Period Debit ifrs-full:TransportationExpense
71 General and administrative Concept (Monetary) For Period Debit ifrs-full:SellingGeneralAndAdministrativeExpense
72 Restructuring Concept (Monetary) For Period Debit ifrs-full:ExpenseOfRestructuringActivities
73 Share-based compensation Concept (Monetary) For Period Debit ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
74 Depletion, depreciation, impairment and accretion Concept (Monetary) For Period Debit obe:DepletionDepreciationImpairmentLossAndAccretionRecognisedInProfitOrLoss
75 Gain on dispositions Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnDisposalsOfPropertyPlantAndEquipment
76 Provisions Concept (Monetary) For Period Credit obe:ProvisionsRecognisedInProfitOrLoss
77 Foreign exchange loss (gain) Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss
78 Financing Concept (Monetary) For Period Debit ifrs-full:FinanceCosts
79 Other Concept (Monetary) For Period Debit ifrs-full:OtherExpenseByNature
80 Total expenses Concept (Monetary) For Period Debit ifrs-full:ExpenseByNature
81 Loss before taxes Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
82 Deferred tax recovery Concept (Monetary) For Period ifrs-full:DeferredTaxExpenseIncomeRecognisedInProfitOrLoss
83 Net and comprehensive loss Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
84 Net loss per share Abstract ifrs-full:EarningsPerShareAbstract
85 Basic Concept (Share) For Period ifrs-full:BasicEarningsLossPerShare
86 Diluted Concept (Share) For Period ifrs-full:DilutedEarningsLossPerShare
87 Weighted average shares outstanding (millions) Abstract ifrs-full:WeightedAverageSharesAndAdjustedWeightedAverageSharesAbstract
88 Basic Concept (Shares) For Period ifrs-full:WeightedAverageShares
89 Diluted Concept (Shares) For Period ifrs-full:AdjustedWeightedAverageShares
90 1005 - Statement - Consolidated Statements of Cash Flows Network

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91 Statement [table] Table

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92 Legal entity [axis] Axis dei:LegalEntityAxis
93 Entity [Domain] Member dei:EntityDomain
94 Statement [LineItems] LineItems obe:StatementLineItems
95 Operating activities Abstract ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
96 Net income (loss) Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
97 Depletion, depreciation, impairment and accretion Concept (Monetary) For Period Debit obe:DepletionDepreciationImpairmentLossAndAccretionRecognisedInProfitOrLoss
98 Gain on dispositions Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets
99 Provisions Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForProvisions
100 Deferred tax recovery Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDeferredTaxExpense
101 Share-based compensation Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForSharebasedPayments
102 Unrealized risk management loss (gain) Concept (Monetary) For Period Credit obe:AdjustmentForUnrealizedRiskManagementGainLoss
103 Unrealized foreign exchange gain Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForUnrealisedForeignExchangeLossesGains
104 Restructuring Concept (Monetary) For Period Debit obe:AdjustmentsForRestructuring
105 Other Concept (Monetary) For Period Debit ifrs-full:OtherAdjustmentsToReconcileProfitLoss
106 Decommissioning expenditures Concept (Monetary) For Period Debit obe:AdjustmentsForDecommissioningExpenditures
107 Office lease settlements Concept (Monetary) For Period Credit ifrs-full:CashOutflowForLeases
108 Change in non-cash working capital Concept (Monetary) For Period Credit obe:IncreaseDecreaseInNonCashWorkingCapitalOperatingActivities
109 Cash flows from (used in) operating activities Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperatingActivities
110 Investing activities Abstract ifrs-full:CashFlowsFromUsedInInvestingActivitiesAbstract
111 Capital expenditures Concept (Monetary) For Period Credit ifrs-full:PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
112 Property dispositions (acquisitions), net Concept (Monetary) For Period Debit obe:ProceedsPaymentFromDispositionsAcquisitionsOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
113 Change in non-cash working capital Concept (Monetary) For Period Debit obe:NonCashChangesInWorkingCapitalRelatedToInvestingActivities
114 Cash flows from (used in) investing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInInvestingActivities
115 Financing activities Abstract ifrs-full:CashFlowsFromUsedInFinancingActivitiesAbstract
116 Increase (decrease) in long-term debt Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInIncreaseDecreaseInCurrentBorrowings
117 Repayments of senior notes Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfBondsNotesAndDebentures
118 Realized foreign exchange loss on repayments Concept (Monetary) For Period Debit obe:IncreaseDecreaseThroughNetExchangeDifferencesRepaymentsOfDebt
119 Issue of equity compensation plans Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssuingShares
120 Cash flows from (used in) financing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInFinancingActivities
121 Change in cash and cash equivalents Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseInCashAndCashEquivalents
122 Cash and cash equivalents, beginning of year Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
123 Cash and cash equivalents, end of year Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
124 1006 - Statement - Statements of Changes in Shareholders' Equity Network

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http://imetrix.edgar-online.com/taxonomy/role/StatementOfChangesInEquity-610000
125 Statement [table] Table

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126 Legal entity [axis] Axis dei:LegalEntityAxis
127 Entity [Domain] Member dei:EntityDomain
128 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
129 Equity [member] Member ifrs-full:EquityMember
130 Shareholders' Capital [member] Member ifrs-full:IssuedCapitalMember
131 Other Reserves [member] Member ifrs-full:OtherReservesMember
132 Deficit [member] Member ifrs-full:RetainedEarningsMember
133 Statement [LineItems] LineItems obe:StatementLineItems
134 Beginning balance Concept (Monetary) As Of Credit ifrs-full:Equity
135 Net and comprehensive loss Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
136 Share-based compensation Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions
137 Issued on exercise of options Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughExerciseOfOptions
138 Elimination of deficit Concept (Monetary) For Period Debit obe:AdjustmentsForDeficitElimination
139 Ending balance Concept (Monetary) As Of Credit ifrs-full:Equity
140 1007 - Disclosure - Structure of Obsidian Energy Network

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141 Statement [table] Table

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143 Entity [Domain] Member dei:EntityDomain
144 Statement [LineItems] LineItems obe:StatementLineItems
145 Structure of Obsidian Energy Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCompositionOfGroupExplanatory
146 1008 - Disclosure - Basis of presentation and statement of compliance Network

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147 Statement [table] Table

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149 Entity [Domain] Member dei:EntityDomain
150 Statement [LineItems] LineItems obe:StatementLineItems
151 Basis of presentation and statement of compliance Concept (Text Block (HTML)) For Period obe:TheEntireDisclosureBasisOfPresentationAndStatementOfComplianceExplanatory
152 1009 - Disclosure - Significant accounting policies Network

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153 Statement [table] Table

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155 Entity [Domain] Member dei:EntityDomain
156 Statement [LineItems] LineItems obe:StatementLineItems
157 Significant accounting policies Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory
158 1010 - Disclosure - Deferred funding asset Network

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159 Statement [table] Table

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160 Legal entity [axis] Axis dei:LegalEntityAxis
161 Entity [Domain] Member dei:EntityDomain
162 Statement [LineItems] LineItems obe:StatementLineItems
163 Deferred funding asset Concept (Text Block (HTML)) For Period obe:DisclosureOfDeferredFundingAssetExplanatory
164 1011 - Disclosure - Assets and liabilities held for sale Network

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165 Statement [table] Table

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167 Entity [Domain] Member dei:EntityDomain
168 Statement [LineItems] LineItems obe:StatementLineItems
169 Assets and liabilities held for sale Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfNoncurrentAssetsHeldForSaleAndDiscontinuedOperationsExplanatory
170 1012 - Disclosure - Property, plant and equipment Network

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http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfPropertyPlantAndEquipmentExplanatory
171 Statement [table] Table

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172 Legal entity [axis] Axis dei:LegalEntityAxis
173 Entity [Domain] Member dei:EntityDomain
174 Statement [LineItems] LineItems obe:StatementLineItems
175 Property, plant and equipment Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfPropertyPlantAndEquipmentExplanatory
176 1013 - Disclosure - Long-term debt Network

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177 Statement [table] Table

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179 Entity [Domain] Member dei:EntityDomain
180 Statement [LineItems] LineItems obe:StatementLineItems
181 Long-term debt Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBorrowingsExplanatory
182 1014 - Disclosure - Provisions Network

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183 Statement [table] Table

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185 Entity [Domain] Member dei:EntityDomain
186 Statement [LineItems] LineItems obe:StatementLineItems
187 Provisions Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfProvisionsExplanatory
188 1015 - Disclosure - Risk management Network

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189 Statement [table] Table

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191 Entity [Domain] Member dei:EntityDomain
192 Statement [LineItems] LineItems obe:StatementLineItems
193 Risk management Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialRiskManagementExplanatory
194 1016 - Disclosure - Revenue Network

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195 Statement [table] Table

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197 Entity [Domain] Member dei:EntityDomain
198 Statement [LineItems] LineItems obe:StatementLineItems
199 Revenue Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfRevenueFromContractsWithCustomersExplanatory
200 1017 - Disclosure - Income taxes Network

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201 Statement [table] Table

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203 Entity [Domain] Member dei:EntityDomain
204 Statement [LineItems] LineItems obe:StatementLineItems
205 Income taxes Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIncomeTaxExplanatory
206 1018 - Disclosure - Shareholders' equity Network

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http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory
207 Statement [table] Table

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209 Entity [Domain] Member dei:EntityDomain
210 Statement [LineItems] LineItems obe:StatementLineItems
211 Shareholders' equity Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory
212 1019 - Disclosure - Share-based compensation Network

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213 Statement [table] Table

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214 Legal entity [axis] Axis dei:LegalEntityAxis
215 Entity [Domain] Member dei:EntityDomain
216 Statement [LineItems] LineItems obe:StatementLineItems
217 Share-based compensation Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSharebasedPaymentArrangementsExplanatory
218 1020 - Disclosure - Per share amounts Network

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219 Statement [table] Table

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221 Entity [Domain] Member dei:EntityDomain
222 Statement [LineItems] LineItems obe:StatementLineItems
223 Per share amounts Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEarningsPerShareExplanatory
224 1021 - Disclosure - Changes in non-cash working capital (increase) decrease Network

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http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfIncreaseDecreaseInNoncashWorkingCapitalAndSplitAmongstOperatingAndInvestingActivitiesExplanatory
225 Statement [table] Table

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229 Changes in non-cash working capital (increase) decrease Concept (Text Block (HTML)) For Period obe:DisclosureOfIncreaseDecreaseInNoncashWorkingCapitalAndSplitAmongstOperatingAndInvestingActivitiesExplanatory
230 1022 - Disclosure - Capital management Network

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231 Statement [table] Table

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233 Entity [Domain] Member dei:EntityDomain
234 Statement [LineItems] LineItems obe:StatementLineItems
235 Capital management Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalExplanatory
236 1023 - Disclosure - Commitments and contingencies Network

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237 Statement [table] Table

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240 Statement [LineItems] LineItems obe:StatementLineItems
241 Commitments and contingencies Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCommitmentsAndContingentLiabilitiesExplanatory
242 1024 - Disclosure - Related-party transactions Network

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243 Statement [table] Table

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247 Related-party transactions Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfRelatedPartyExplanatory
248 1025 - Disclosure - Supplemental Items Network

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249 Statement [table] Table

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253 Supplemental Items Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfAdditionalInformationExplanatory
254 1026 - Disclosure - Supplementary Oil and Gas Information - (Unaudited) Network

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255 Statement [table] Table

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259 Supplementary Oil and Gas Information - (Unaudited) Concept (Text Block (HTML)) For Period obe:DisclosureOfSupplementaryInformationRelatedToOilAndGasExplanatory
260 1027 - Disclosure - Significant accounting policies (Policies) Network

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261 Statement [table] Table

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265 Critical accounting judgments and key estimates Concept (Text Block (HTML)) For Period obe:JudgmentsAndEstimatesMadeByCompanyInPreparationOfTheseFinancialStatementsExplanatory
266 Business combinations Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForBusinessCombinationsExplanatory
267 Revenue Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForRecognitionOfRevenue
268 Joint arrangements Concept (Text Block (HTML)) For Period obe:DescriptionOfAccountingPolicyForJointArrangementsTextBlock
269 Transportation expense Concept (Text Block (HTML)) For Period obe:DescriptionOfAccountingPolicyForTransportationExpenseTextBlock
270 Foreign currency translation Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory
271 PP&E Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory
272 Share-based payments Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory
273 Provisions Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForProvisionsExplanatory
274 Leases Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForLeasesExplanatory
275 Share capital Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForIssuedCapitalExplanatory
276 Earnings per share Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForEarningsPerShareExplanatory
277 Taxation Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForIncomeTaxExplanatory
278 Financial instruments Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory
279 Embedded derivatives Concept (Text Block (HTML)) For Period obe:DescriptionOfAccountingPolicyForEmbeddedDerivativesExplanatory
280 Classification of debt or equity Concept (Text Block (HTML)) For Period obe:DescriptionOfAccountingPolicyForClassificationOfDebtOrEquityExplanatory
281 New Accounting Policies Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfChangesInAccountingPoliciesExplanatory
282 Future accounting pronouncements Concept (Text Block (HTML)) For Period obe:FutureAccountingPronouncementsPolicyExplanatory
283 1028 - Disclosure - Significant accounting policies (Tables) Network

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284 Statement [table] Table

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288 Impact of Adoption of IFRS 15 on Certain Line Items within Consolidated Statements of Income (Loss) (Detail) Concept (Text Block (HTML)) For Period obe:DisclosureOfDetailsOfNoImpactChangesInConsolidatedNetIncomeLossExplanatory
289 Summary of Original Measurement Categories Under IAS 39 and New Measurement Categories Under IFRS 9 Concept (Text Block (HTML)) For Period obe:DisclosureOfMeasurementCategoriesUnderIAS39AndUnderIFRS9Explanatory
290 1029 - Disclosure - Deferred funding asset (Tables) Network

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296 1030 - Disclosure - Assets and liabilities held for sale (Tables) Network

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301 Disclosure of Detailed Information about Assets and Liabilities Held for Sale Concept (Text Block (HTML)) For Period obe:DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesHeldForSaleExplanatory
302 1031 - Disclosure - Property, plant and equipment (Tables) Network

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306 Statement [LineItems] LineItems obe:StatementLineItems
307 Disclosure of Property Plant and Equipment Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory
308 Disclosure of Benchmark Prices Used in Impairment Tests Concept (Text Block (HTML)) For Period obe:DisclosureOfDetailedInformationAboutBenchmarkPricesUsedInImpairmentTestsExplanatory
309 1032 - Disclosure - Long-term debt (Tables) Network

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310 Statement [table] Table

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311 Legal entity [axis] Axis dei:LegalEntityAxis
312 Entity [Domain] Member dei:EntityDomain
313 Statement [LineItems] LineItems obe:StatementLineItems
314 Schedule of Long-term Debt Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDebtSecuritiesExplanatory
315 Estimated Fair Values of Principal and Interest Obligations of Outstanding Senior Secured Notes Concept (Text Block (HTML)) For Period obe:DisclosureOfEstimatedFairValueOfDebtExplanatory
316 Realized and Unrealized Gain (Loss) on Foreign Exchange Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEffectOfChangesInForeignExchangeRatesExplanatory
317 1033 - Disclosure - Provisions (Tables) Network

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318 Statement [table] Table

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319 Legal entity [axis] Axis dei:LegalEntityAxis
320 Entity [Domain] Member dei:EntityDomain
321 Statement [LineItems] LineItems obe:StatementLineItems
322 Summary of Provisions Concept (Text Block (HTML)) For Period obe:DisclosureOfDetailedInformationAboutProvisionsExplanatory
323 Summary of Changes to Decommissioning Liability Concept (Text Block (HTML)) For Period obe:DisclosureOfChangesInDecommissioningLiabilityExplanatory
324 Summary of Changes to Office Lease Provision Concept (Text Block (HTML)) For Period obe:DisclosureOfChangesInOfficeLeaseProvisionExplanatory
325 1034 - Disclosure - Risk management (Tables) Network

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326 Statement [table] Table

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327 Legal entity [axis] Axis dei:LegalEntityAxis
328 Entity [Domain] Member dei:EntityDomain
329 Statement [LineItems] LineItems obe:StatementLineItems
330 Summary of Reconcilation of Change in Fair Value of Financial Instruments Outstanding Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialInstrumentsAtFairValueThroughProfitOrLossExplanatory
331 Schedule of Financial Instruments Outstanding Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDerivativeFinancialInstrumentsExplanatory
332 Components of Risk Management on Consolidated Statements of Income (Loss) Concept (Text Block (HTML)) For Period obe:DisclosureOfRealizedAndUnrealizedRiskManagementGainLossexplanatory
333 Disclosure of Detailed Information about Accounts Receivable Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTradeAndOtherReceivablesExplanatory
334 Summary of Estimated Future Obligations for Non-Derivative Financial Liabilities Concept (Text Block (HTML)) For Period ifrs-full:MaturityAnalysisForNonderivativeFinancialLiabilities
335 1035 - Disclosure - Revenue (Tables) Network

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336 Statement [table] Table

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337 Legal entity [axis] Axis dei:LegalEntityAxis
338 Entity [Domain] Member dei:EntityDomain
339 Statement [LineItems] LineItems obe:StatementLineItems
340 Disclosure of Significant Revenue Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersExplanatory
341 1036 - Disclosure - Income taxes (Tables) Network

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342 Statement [table] Table

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343 Legal entity [axis] Axis dei:LegalEntityAxis
344 Entity [Domain] Member dei:EntityDomain
345 Statement [LineItems] LineItems obe:StatementLineItems
346 Summary of Provision for Income Taxes Concept (Text Block (HTML)) For Period obe:DisclosureOfProvisionForIncomeTaxesExplanatory
347 Summary of Provision for Income Taxes Reflects Effective Tax Rate Concept (Text Block (HTML)) For Period obe:DisclosureRepresentingMajorComponentsOfTaxExpenseIncomeExplanatory
348 Summary of Net Deferred Income Tax Liability Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDeferredTaxesExplanatory
349 1037 - Disclosure - Shareholders' equity (Tables) Network

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350 Statement [table] Table

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351 Legal entity [axis] Axis dei:LegalEntityAxis
352 Entity [Domain] Member dei:EntityDomain
353 Statement [LineItems] LineItems obe:StatementLineItems
354 Summary of Issued Capital Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIssuedCapitalExplanatory
355 Summary of Other Reserves Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfReservesAndOtherEquityInterestExplanatory
356 1038 - Disclosure - Share-based compensation (Tables) Network

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357 Statement [table] Table

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358 Legal entity [axis] Axis dei:LegalEntityAxis
359 Entity [Domain] Member dei:EntityDomain
360 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
361 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
362 Restricted share unit plan [member] Member obe:RestrictedShareUnitPlanMember
363 PSU Plan [member] Member obe:PerformanceShareUnitPlanMember
364 Plan Name1 [axis] Axis obe:PlanName1Axis
365 Plan Name 1 [domain] Member obe:PlanName1Domain
366 Options granted prior to June 2017 [member] Member obe:OptionsGrantedPriorToJuneTwoThousandSeventeenMember
367 Options granted from June 2017 [member] Member obe:OptionsGrantedFromJuneTwoThousandSeventeenMember
368 Statement [LineItems] LineItems obe:StatementLineItems
369 Summary of Restricted and Performance Share Unit plan ("RPSU plan") Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfNumberAndWeightedAverageExercisePricesOfOtherEquityInstrumentsExplanatory
370 Summary of Weighted Average Assumptions of RPSU Plan Units Under Equity Method Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedOtherEquityInstrumentsGrantedDuringPeriodExplanatory
371 Summary of Stock Option Activity and Related Information Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfNumberAndWeightedAverageExercisePricesOfShareOptionsExplanatory
372 Summary of Options Outstanding and Exercisable Concept (Text Block (HTML)) For Period obe:DisclosureOfOptionsOutstandingAndExcercisableExplanatory
373 Summary of Share-Based Compensation Concept (Text Block (HTML)) For Period obe:DisclosureOfShareBasedCompensationExplanatory
374 1039 - Disclosure - Per share amounts (Tables) Network

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375 Statement [table] Table

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376 Legal entity [axis] Axis dei:LegalEntityAxis
377 Entity [Domain] Member dei:EntityDomain
378 Statement [LineItems] LineItems obe:StatementLineItems
379 Disclosure of Detailed Information about Net Loss Basic and Diluted Concept (Text Block (HTML)) For Period obe:DisclosureOfDetailedInformationAboutNetLossBasicAndDilutedExplanatory
380 Disclosure of Detailed Information about Weighted Average Number of Shares Per Share Concept (Text Block (HTML)) For Period ifrs-full:EarningsPerShareExplanatory
381 1040 - Disclosure - Changes in non-cash working capital (increase) decrease (Tables) Network

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382 Statement [table] Table

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383 Legal entity [axis] Axis dei:LegalEntityAxis
384 Entity [Domain] Member dei:EntityDomain
385 Statement [LineItems] LineItems obe:StatementLineItems
386 Summary of Changes in Non-cash Working Capital (Increase) Decrease Concept (Text Block (HTML)) For Period obe:DisclosureOfDetailedInformationIncreaseDecreaseInNoncashWorkingCapitalExplanatory
387 1041 - Disclosure - Capital management (Tables) Network

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388 Statement [table] Table

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389 Legal entity [axis] Axis dei:LegalEntityAxis
390 Entity [Domain] Member dei:EntityDomain
391 Statement [LineItems] LineItems obe:StatementLineItems
392 Summary of Financial Covenants Under Lending Agreements Concept (Text Block (HTML)) For Period obe:DisclosureOfFinancialCovenantsUnderLendingAgreementsExplanatory
393 1042 - Disclosure - Commitments and contingencies (Tables) Network

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394 Statement [table] Table

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395 Legal entity [axis] Axis dei:LegalEntityAxis
396 Entity [Domain] Member dei:EntityDomain
397 Statement [LineItems] LineItems obe:StatementLineItems
398 Summary of Certain Payments Over the Next Five Years Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCommitmentsExplanatory
399 1043 - Disclosure - Related-party transactions (Tables) Network

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400 Statement [table] Table

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401 Legal entity [axis] Axis dei:LegalEntityAxis
402 Entity [Domain] Member dei:EntityDomain
403 Statement [LineItems] LineItems obe:StatementLineItems
404 Summary of Compensation of key Management Personnel Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInformationAboutKeyManagementPersonnelExplanatory
405 1044 - Disclosure - Supplementary Oil and Gas Information - (Unaudited) (Tables) Network

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406 Statement [table] Table

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407 Legal entity [axis] Axis dei:LegalEntityAxis
408 Entity [Domain] Member dei:EntityDomain
409 Statement [LineItems] LineItems obe:StatementLineItems
410 Net Proved Oil and Natural Gas Reserves Concept (Text Block (HTML)) For Period srt:ScheduleOfProvedDevelopedAndUndevelopedOilAndGasReserveQuantitiesTextBlock
411 Capitalized Costs Concept (Text Block (HTML)) For Period obe:CapitalizedCostsRelatingToOilAndGasProducingActivitiesDisclosureTextBlock
412 Costs Incurred Concept (Text Block (HTML)) For Period obe:CostIncurredInOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivitiesDisclosureTextBlock
413 Standardized Measure of Discounted Future Net Cash Flows Concept (Text Block (HTML)) For Period srt:StandardizedMeasureOfDiscountedFutureCashFlowsRelatingToProvedReservesDisclosureTextBlock
414 Standardized Measure of Discounted Future Net Cash Flow Changes Concept (Text Block (HTML)) For Period srt:ScheduleOfChangesInStandardizedMeasureOfDiscountedFutureNetCashFlowsTableTextBlock
415 1045 - Disclosure - Structure of Penn West - Additional Information (Detail) Network

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416 Disclosure of operating segments [table] Table

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417 Legal entity [axis] Axis dei:LegalEntityAxis
418 Entity [Domain] Member dei:EntityDomain
419 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
420 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
421 Peace River Oil Partnership [member] Member obe:PeaceRiverOilPartnershipMember
422 Disclosure of operating segments [line items] LineItems ifrs-full:DisclosureOfOperatingSegmentsLineItems
423 Number of operating segment Concept (Integer) For Period obe:NumberOfReportableOperatingSegments
424 Percentage of ownership in petroleum and natural gas assets Concept (Percent) For Period obe:PercentageOfOwnershipOfPetroleumAndNaturalGasAssets
425 Proportion of ownership interest in joint arrangement Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInJointOperation
426 1046 - Disclosure - Significant accounting policies - Additional Information (Detail) Network

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427 Summary Of Significant Accounting Policies [table] Table

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428 Legal entity [axis] Axis dei:LegalEntityAxis
429 Entity [Domain] Member dei:EntityDomain
430 Range [axis] Axis ifrs-full:RangeAxis
431 Ranges [member] Member ifrs-full:RangesMember
432 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
433 Top of range [member] Member ifrs-full:TopOfRangeMember
434 Joint operations [axis] Axis ifrs-full:JointOperationsAxis
435 Entity's total for joint operations [member] Member ifrs-full:EntitysTotalForJointOperationsMember
436 Peace River Oil Partnership [member] Member obe:PeaceRiverOilPartnershipMember
437 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
438 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
439 Turnaround component [member] Member obe:TurnaroundComponentMember
440 Corporate asset component [member] Member obe:CorporateAssetComponentMember
441 Summary Of Significant Accounting Policies [Line items] LineItems obe:SummaryOfSignificantAccountingPoliciesLineItems
442 Percentage of economically recoverable proved reserves Concept (Percent) For Period obe:PercentageOfEconomicallyRecoverableProvedReserves
443 Proportion of ownership interest in joint arrangement Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInJointOperation
444 Description of conversion of oil and gas products Concept (Text/String) For Period obe:DescriptionOfConversionOfOilAndGasProducts
445 Estimated useful life Concept (Text/String) For Period ifrs-full:UsefulLivesOrDepreciationRatesPropertyPlantAndEquipment
446 1047 - Disclosure - Significant accounting policies - Impact of Adoption of IFRS 15 on Certain Line Items within Consolidated Statements of Income (Loss) (Detail) Network

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447 Significant Changes In Financial Statement Line Items Due To Application Of IFRS15 [table] Table

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448 Legal entity [axis] Axis dei:LegalEntityAxis
449 Entity [Domain] Member dei:EntityDomain
450 Retrospective application and retrospective restatement [axis] Axis ifrs-full:RetrospectiveApplicationAndRetrospectiveRestatementAxis
451 Currently stated [member] Member ifrs-full:RestatedMember
452 Increase (decrease) due to application of IFRS 15 [member] Member ifrs-full:IncreaseDecreaseDueToApplicationOfIFRS15Member
453 Significant changes in financial statement line items due to application of IFRS15 [line items] LineItems obe:SignificantChangesInFinancialStatementLineItemsDueToApplicationOfIFRS15LineItems
454 Increase in Oil and natural gas sales and other income Concept (Monetary) For Period Credit ifrs-full:RevenueFromSaleOfOilAndGasProducts
455 Increase in Operating expenses Concept (Monetary) For Period Debit ifrs-full:OperatingExpense
456 Net and comprehensive loss Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
457 1048 - Disclosure - Significant accounting policies - Summary of Original Measurement Categories Under IAS 39 and New Measurement Categories Under IFRS 9 (Detail) Network

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458 Disclosure of original measurement categories under ias39 and new measurement categories under ifrs9 for each class of company financial assets and financial liabilities [table] Table

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459 Legal entity [axis] Axis dei:LegalEntityAxis
460 Entity [Domain] Member dei:EntityDomain
461 Retrospective application and retrospective restatement [axis] Axis ifrs-full:RetrospectiveApplicationAndRetrospectiveRestatementAxis
462 Currently stated [member] Member ifrs-full:RestatedMember
463 IFRS9 [member] Member obe:IFRS9Member
464 IAS 39 [member] Member obe:IAS39Member
465 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
466 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
467 Cash and cash equivalents [member] Member obe:CashAndCashEquivalentMember
468 Accounts receivable [member] Member obe:AccountsReceivableMember
469 Accounts payable and accrued liabilities [member] Member obe:AccountsPayableAndAccruedLiabilitiesMember
470 Long term debt [member] Member obe:LongTermDebtMember
471 Risk management contracts [member] Member obe:RiskManagementContractsMember
472 Disclosure of original measurement categories under IAS 39 and new measurement categories under IFRS 9 for each class of company financial assets and financial liabilities [line items] LineItems obe:DisclosureOfOriginalMeasurementCategoriesUnderIAS39AndNewMeasurementCategoriesUnderIFRS9ForEachClassOfCompanyFinancialAssetsAndFinancialLiabilitiesLineItems
473 Measurement category Concept (Text/String) For Period obe:MeasurementCategory
474 1049 - Disclosure - Deferred Funding Asset - Disclosure of Detailed Information About Composition of Deferred Funding Asset (Detail) Network

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475 Disclosure of financial assets [table] Table

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476 Legal entity [axis] Axis dei:LegalEntityAxis
477 Entity [Domain] Member dei:EntityDomain
478 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
479 Current portion Concept (Monetary) As Of Debit obe:CurrentDeferredFundingAsset
480 Long-term portion Concept (Monetary) As Of Debit obe:NoncurrentDeferredFundingAsset
481 Total Concept (Monetary) As Of Debit obe:DeferredFundingAsset
482 1050 - Disclosure - Assets and Liabilities Held for Sale - Disclosure of Detailed Information about Assets and Liabilities Held for Sale (Detail) Network

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483 Disclosure of assets and liabilities classified as held for sale [table] Table

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484 Legal entity [axis] Axis dei:LegalEntityAxis
485 Entity [Domain] Member dei:EntityDomain
486 Assets and liabilities [axis] Axis ifrs-full:AssetsAndLiabilitiesAxis
487 Assets and liabilities [member] Member ifrs-full:AssetsAndLiabilitiesMember
488 Working capital [member] Member obe:WorkingCapitalMember
489 Disposal of property, plant and equipment [member] Member obe:DisposalOfPropertyPlantAndEquipmentMember
490 Decommissioning liability [member] Member obe:DecommissioningLiabilityMember
491 Disclosure of assets and liabilities classified as held for sale [line items] LineItems obe:DisclosureOfAssetsAndLiabilitiesClassifiedAsHeldForSaleLineItems
492 Assets held for sale Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners
493 Liabilities related to assets held for sale Concept (Monetary) As Of Credit ifrs-full:LiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale
494 1051 - Disclosure - Assets and Liabilities Held for Sale - Additional Information (Detail) Network

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495 Disclosure of assets and liabilities classified as held for sale [table] Table

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496 Legal entity [axis] Axis dei:LegalEntityAxis
497 Entity [Domain] Member dei:EntityDomain
498 Income Statement Location 1 [axis] Axis obe:IncomeStatementLocation1Axis
499 Income Statement Location 1 [member] Member obe:IncomeStatementLocationMember
500 Depletion depreciation, impairment and accretion [member] Member obe:DepletionDepreciationImpairmentAndAccretionMember
501 Disclosure of assets and liabilities classified as held for sale [line items] LineItems obe:DisclosureOfAssetsAndLiabilitiesClassifiedAsHeldForSaleLineItems
502 Impairment loss, net of tax Concept (Monetary) For Period obe:ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipmentNetOfTax
503 1052 - Disclosure - Property, plant and equipment - Disclosure of Property Plant and Equipment (Detail) Network

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

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505 Legal entity [axis] Axis dei:LegalEntityAxis
506 Entity [Domain] Member dei:EntityDomain
507 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
508 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
509 Oil and gas assets [member] Member ifrs-full:OilAndGasAssetsMember
510 Facilities [member] Member obe:FacilitiesMember
511 Corporate assets [member] Member obe:CorporateAssetsMember
512 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
513 Carrying amount [member] Member ifrs-full:CarryingAmountMember
514 Cost [member] Member ifrs-full:GrossCarryingAmountMember
515 Accumulated depletion, depreciation and impairment [member] Member ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember
516 Disclosure of detailed information about property, plant and equipment [line items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
517 Beginning balance Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
518 Capital expenditures Concept (Monetary) For Period Debit ifrs-full:AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment
519 Depletion and depreciation Concept (Monetary) For Period ifrs-full:DepreciationPropertyPlantAndEquipment
520 Joint venture, carried capital Concept (Monetary) For Period Debit obe:JointVentureCarriedCapital
521 Impairments Concept (Monetary) For Period ifrs-full:ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment
522 Acquisitions Concept (Monetary) For Period Debit ifrs-full:AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment
523 Dispositions Concept (Monetary) For Period Credit ifrs-full:DisposalsPropertyPlantAndEquipment
524 Transfers to asset held for sale Concept (Monetary) For Period Credit obe:TransferToAssetHeldForSale
525 Net decommissioning dispositions Concept (Monetary) For Period Credit obe:DecommissioningDispositionsNet
526 SR&ED credits (note 11) Concept (Monetary) For Period Credit obe:ScientificResearchAndExperimentalDevelopmentTaxCredit
527 Ending balance Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
528 1053 - Disclosure - Property, plant and equipment - Additional Information (Detail) Network

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

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530 Legal entity [axis] Axis dei:LegalEntityAxis
531 Entity [Domain] Member dei:EntityDomain
532 Individual assets or cash-generating units [axis] Axis ifrs-full:IndividualAssetsOrCashgeneratingUnitsAxis
533 Entity's total for individual assets or cash-generating units [member] Member ifrs-full:EntitysTotalForIndividualAssetsOrCashgeneratingUnitsMember
534 Peace River CGU [member] Member obe:PeaceRiverCguMember
535 Viking CGU [member] Member obe:VikingCguMember
536 Legacy CGU [member] Member obe:LegacyCguMember
537 Range [axis] Axis ifrs-full:RangeAxis
538 Ranges [member] Member ifrs-full:RangesMember
539 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
540 Top of range [member] Member ifrs-full:TopOfRangeMember
541 Discount rate [axis] Axis obe:DiscountRateAxis
542 Discount rate 1- [member] Member obe:DiscountRate1Member
543 1% percent change in discount rate [member] Member obe:OnePercentChangeInDiscountRateMember
544 5% change in forecast cash flows [member] Member obe:FivePercentChangeInForecastCashFlowsMember
545 Disclosure of detailed information about property, plant and equipment [line items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
546 Gains on disposition of assets Concept (Monetary) For Period Credit obe:GainsLossesOnDisposalOfOilAndGasAssets
547 Impairment reversal Concept (Monetary) For Period Credit ifrs-full:ReversalOfImpairmentLoss
548 Impairment Concept (Monetary) For Period ifrs-full:ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment
549 Description of value in use calculation Concept (Text/String) For Period obe:DescriptionOfValueInUseCalculation
550 Discount rate used in current estimate of value in use Concept (Percent) As Of ifrs-full:DescriptionOfDiscountRatesUsedInCurrentEstimateOfValueInUse
551 Pre-tax impairement expense recovery Concept (Monetary) For Period Credit obe:PretaxImpairmentExpenseRecovery
552 1054 - Disclosure - Property, plant and equipment - Disclosure of Benchmark Prices Used in Impairment Tests (Detail) Network

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

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554 Legal entity [axis] Axis dei:LegalEntityAxis
555 Entity [Domain] Member dei:EntityDomain
556 WTI [member] Member obe:WTIMember
557 AECO [member] Member obe:AECOMember
558 Disclosure of detailed information about property, plant and equipment [line items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
559 2019 Concept (Decimal) As Of obe:ExchangeRateOfBenchmarkPricesUsedInImpairmentTestWithinOneYear
560 2020 Concept (Decimal) As Of obe:ExchangeRateOfBenchmarkPricesUsedInImpairmentTestInYearTwo
561 2021 Concept (Decimal) As Of obe:ExchangeRateOfBenchmarkPricesUsedInImpairmentTestInYearThree
562 2022 Concept (Decimal) As Of obe:ExchangeRateOfBenchmarkPricesUsedInImpairmentTestInYearFour
563 2023 Concept (Decimal) As Of obe:ExchangeRateOfBenchmarkPricesUsedInImpairmentTestInYearFive
564 2024 - 2029 Concept (Decimal) As Of obe:ExchangeRateOfBenchmarkPricesUsedInImpairmentTestAfterYearFive
565 2019 Concept (Decimal) As Of obe:BenchmarkPricesUsedInImpairmentTestWithinOneYear
566 2020 Concept (Decimal) As Of obe:BenchmarkPricesUsedInImpairmentTestInYearTwo
567 2021 Concept (Decimal) As Of obe:BenchmarkPricesUsedInImpairmentTestInYearThree
568 2022 Concept (Decimal) As Of obe:BenchmarkPricesUsedInImpairmentTestInYearFour
569 2023 Concept (Decimal) As Of obe:BenchmarkPricesUsedInImpairmentTestInYearFive
570 2024 - 2029 Concept (Decimal) As Of obe:BenchmarkPricesUsedInImpairmentTestAfterYearFive
571 Thereafter (inflation percentage) Concept (Percent) As Of obe:BenchmarkPricesInflationPercentageUsedInImpairmentTest
572 2019 Concept (Percent) As Of obe:InflationRateOfBenchmarkPricesUsedInImpairmentTestWithinOneYear
573 2020 Concept (Percent) As Of obe:InflationRateOfBenchmarkPricesUsedInImpairmentTestInYearTwo
574 2021 Concept (Percent) As Of obe:InflationRateOfBenchmarkPricesUsedInImpairmentTestInYearThree
575 2022 Concept (Percent) As Of obe:InflationRateOfBenchmarkPricesUsedInImpairmentTestInYearFour
576 2023 Concept (Percent) As Of obe:InflationRateOfBenchmarkPricesUsedInImpairmentTestInYearFive
577 2024 - 2029 Concept (Percent) As Of obe:InflationRateOfBenchmarkPricesUsedInImpairmentTestAfterYearFive
578 Thereafter (inflation percentage) Concept (Percent) As Of obe:InflationRateOfBenchmarkPricesUsedInImpairmentTestThereafter
579 1055 - Disclosure - Long-term debt - Schedule of Long-term Debt (Detail) Network

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580 Disclosure of detailed information about borrowings [table] Table

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581 Legal entity [axis] Axis dei:LegalEntityAxis
582 Entity [Domain] Member dei:EntityDomain
583 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
584 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
585 Bankers acceptances and prime rate loans [member] Member obe:BankersAcceptancesAndPrimeRateLoansMember
586 5.90%, US$5 Million, maturing May 31, 2019 [member] Member obe:FivePointNineZeroPercentageUsSeniorNotesMember
587 6.30%, US$24 Million, maturing May 29, 2018 [member] Member obe:SixPointThreeZeroPercentageTwoThousandEightSeniorNotesMember
588 6.40%, US$4 Million, maturing May 29, 2020 [member] Member obe:SixPointFourZeroPercentageTwoThousandEightSeniorNotesMember
589 9.32%, US$8 Million, maturing May 5, 2019 [member] Member obe:NinePointThreeTwoPercentageTwoThousandNineSeniorNotesMember
590 5.85%, US$10 Million, maturing March 16, 2020 [member] Member obe:FivePointEightFivePercentageTwoThousandTenQOneSeniorNotesMember
591 4.88%, US$13 Million, maturing December 2, 2020 [member] Member obe:FourPointEightEightPercentageTwoThousandTenQFourSeniorNotesMember
592 4.98%, US$6 Million, maturing December 2, 2022 [member] Member obe:FourPointNineEightPercentageTwoThousandTenQFourSeniorNotesMember
593 5.23%, US$2 Million, maturing December 2, 2025 [member] Member obe:FivePointTwoThreePercentageTwoThousandTenQFourSeniorNotesMember
594 4.79%, US$12 Million, maturing November 30, 2021 [member] Member obe:FourPointSevenNinePercentageTwoThousandElevenFourQSeniorNotesMember
595 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
596 Borrowings Concept (Monetary) As Of Credit ifrs-full:Borrowings
597 Current portion Concept (Monetary) As Of Credit ifrs-full:CurrentPortionOfLongtermBorrowings
598 Long-term portion Concept (Monetary) As Of Credit ifrs-full:LongtermBorrowings
599 Weighted average remaining life (years) Concept (Text/String) For Period obe:DebtWeightedAverageUsefulLife
600 Weighted average interest rate Concept (Percent) For Period obe:DebtWeightedAverageInterestRate1
601 1056 - Disclosure - Long-term debt - Schedule of Long-term Debt (Parenthetical) (Detail) Network

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602 Disclosure of detailed information about borrowings [table] Table

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ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
603 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
604 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
605 5.90%, US$5 Million, maturing May 31, 2019 [member] Member obe:FivePointNineZeroPercentageUsSeniorNotesMember
606 6.30%, US$24 Million, maturing May 29, 2018 [member] Member obe:SixPointThreeZeroPercentageTwoThousandEightSeniorNotesMember
607 6.40%, US$4 Million, maturing May 29, 2020 [member] Member obe:SixPointFourZeroPercentageTwoThousandEightSeniorNotesMember
608 9.32%, US$8 Million, maturing May 5, 2019 [member] Member obe:NinePointThreeTwoPercentageTwoThousandNineSeniorNotesMember
609 5.85%, US$10 Million, maturing March 16, 2020 [member] Member obe:FivePointEightFivePercentageTwoThousandTenQOneSeniorNotesMember
610 4.88%, US$13 Million, maturing December 2, 2020 [member] Member obe:FourPointEightEightPercentageTwoThousandTenQFourSeniorNotesMember
611 4.98%, US$6 Million, maturing December 2, 2022 [member] Member obe:FourPointNineEightPercentageTwoThousandTenQFourSeniorNotesMember
612 5.23%, US$2 Million, maturing December 2, 2025 [member] Member obe:FivePointTwoThreePercentageTwoThousandTenQFourSeniorNotesMember
613 4.79%, US$12 Million, maturing November 30, 2021 [member] Member obe:FourPointSevenNinePercentageTwoThousandElevenFourQSeniorNotesMember
614 Legal entity [axis] Axis dei:LegalEntityAxis
615 Entity [Domain] Member dei:EntityDomain
616 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
617 Debt, interest rate Concept (Percent) As Of obe:DebtInstrumentInterestRateStatedPercentage1
618 Debt Concept (Monetary) As Of Credit ifrs-full:DebtSecurities
619 Debt, maturity date Concept (Text/String) For Period ifrs-full:BorrowingsMaturity
620 1057 - Disclosure - Long-term debt - Additional Information (Detail) Network

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621 Disclosure of detailed information about borrowings [table] Table

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622 Legal entity [axis] Axis dei:LegalEntityAxis
623 Entity [Domain] Member dei:EntityDomain
624 Categories of financial liabilities [axis] Axis ifrs-full:CategoriesOfFinancialLiabilitiesAxis
625 Financial liabilities, category [member] Member ifrs-full:FinancialLiabilitiesCategoryMember
626 Syndicated credit facility [member] Member obe:SyndicatedCreditFacilityMember
627 Range [axis] Axis ifrs-full:RangeAxis
628 Ranges [member] Member ifrs-full:RangesMember
629 Top of range [member] Member ifrs-full:TopOfRangeMember
630 Non-adjusting events after reporting period [axis] Axis ifrs-full:NonadjustingEventsAfterReportingPeriodAxis
631 Non-adjusting events after reporting period [member] Member ifrs-full:NonadjustingEventsMember
632 Amending agreements [member] Member obe:AmendingAgreementsMember
633 Prior amending agreements [member] Member obe:PriorAmendingAgreementsMember
634 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
635 Repayment of senior notes Concept (Monetary) For Period Credit obe:RepaymentOfSeniorNotes
636 Debt Concept (Monetary) As Of Credit ifrs-full:DebtSecurities
637 Available borrowing facilities Concept (Monetary) As Of Credit obe:AvailableBorrowingFacilities
638 Debt, maturity date Concept (Text/String) For Period ifrs-full:BorrowingsMaturity
639 Credit facilities term out period Concept (xbrli:durationItemType) For Period obe:CreditFacilitiesTermOutPeriod
640 Percentage of long-term debt instruments exposed to changes in short-term interest rates Concept (Percent) For Period obe:PercentageOfLongTermDebtInstrumentsExposedToChangesInShortTermInterestRates
641 Letters of credit outstanding Concept (Monetary) As Of Credit obe:LineOfCreditFacilityAmount
642 Senior debt to Adjusted EBITDA Concept (Pure) As Of obe:SeniorDebtToAdjustedEarningsBeforeInterestTaxesDepreciationAndAmortizationConversionRatio
643 Total debt to Adjusted EBITDA Concept (Pure) As Of obe:DebtToAdjustedEarningsBeforeInterestTaxesDepreciationAndAmortizationConversionRatio
644 1058 - Disclosure - Long-term debt - Estimated Fair Values of Principal and Interest Obligations of Outstanding Senior Secured Notes (Detail) Network

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645 Disclosure of fair value measurement of liabilities [table] Table

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646 Legal entity [axis] Axis dei:LegalEntityAxis
647 Entity [Domain] Member dei:EntityDomain
648 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
649 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
650 2007 notes [member] Member obe:TwoThousandSevenSeniorNotesMember
651 2008 notes [member] Member obe:TwoThousandEightSeniorNotesMember
652 2009 notes [member] Member obe:TwoThousandNineSeniorNotesMember
653 2010 Q1 notes [member] Member obe:TwoThousandTenQOneSeniorNotesMember
654 2010 Q4 notes [member] Member obe:TwoThousandTenQFourSeniorNotesMember
655 2011 notes [member] Member obe:TwoThousandElevenSeniorNotesMember
656 Disclosure of fair value measurement of liabilities [line items] LineItems ifrs-full:DisclosureOfFairValueMeasurementOfLiabilitiesLineItems
657 Senior notes Concept (Monetary) As Of Credit obe:DebtInstrumentFairValue1
658 1059 - Disclosure - Long-term debt - Realized and Unrealized Gain (Loss) on Foreign Exchange (Detail) Network

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659 Disclosure Of Foreign Exchange Rates [table] Table

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660 Legal entity [axis] Axis dei:LegalEntityAxis
661 Entity [Domain] Member dei:EntityDomain
662 Disclosure of foreign exchange rates [line items] LineItems obe:DisclosureOfForeignExchangeRatesLineItems
663 Realized foreign exchange loss on debt maturities Concept (Monetary) For Period Debit obe:LossOnForeignExchangeDebtMaturitiesRecognised
664 Unrealized foreign exchange gain Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForUnrealisedForeignExchangeLossesGains
665 Foreign exchange gain (loss) Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss
666 1060 - Disclosure - Provisions - Summary of Provisions (Detail) Network

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667 Disclosure of Provisions [table] Table

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668 Legal entity [axis] Axis dei:LegalEntityAxis
669 Entity [Domain] Member dei:EntityDomain
670 Disclosure of Provisions [line items] LineItems obe:DisclosureOfProvisionsLineItems
671 Decommissioning liability Concept (Monetary) As Of Credit ifrs-full:ProvisionForDecommissioningRestorationAndRehabilitationCosts
672 Office lease provision Concept (Monetary) As Of Credit obe:OfficeLeaseProvision
673 Total Concept (Monetary) As Of Credit ifrs-full:Provisions
674 Current portion Concept (Monetary) As Of Credit ifrs-full:CurrentProvisions
675 Long-term portion Concept (Monetary) As Of Credit ifrs-full:NoncurrentProvisions
676 Total Concept (Monetary) As Of Credit ifrs-full:Provisions
677 1061 - Disclosure - Provisions - Additional Information (Detail) Network

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678 Disclosure of provision matrix [table] Table

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679 Legal entity [axis] Axis dei:LegalEntityAxis
680 Entity [Domain] Member dei:EntityDomain
681 Classes of other provisions [axis] Axis ifrs-full:ClassesOfProvisionsAxis
682 Other provisions [member] Member ifrs-full:OtherProvisionsMember
683 Decommissioning liability on undiscounted uninflated basis [member] Member obe:DecommissioningLiabilityOnUndiscountedUninflatedBasisMember
684 Disclosure of provision matrix [line items] LineItems ifrs-full:DisclosureOfProvisionMatrixLineItems
685 Decommissioning liability, inflation factor rate Concept (Percent) For Period obe:DecommissioningLiabilityInflationFactorRate
686 Decommissioning liability, credit-adjusted rate Concept (Percent) For Period obe:DecommissioningLiabilityCreditAdjustedRate
687 Decommissioning liability, expected useful life Concept (Decimal) For Period obe:DecommissioningLiabilityExpectedUsefulLife
688 Decommissioning liability Concept (Monetary) As Of Credit ifrs-full:ProvisionForDecommissioningRestorationAndRehabilitationCosts
689 Office lease provision, credit-adjusted discount rate Concept (Percent) For Period obe:OfficeLeaseProvisionCreditAdjustedDiscountRate
690 1062 - Disclosure - Provisions - Summary of Changes to Decommissioning Liability (Detail) Network

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691 Disclosure of Provisions [table] Table

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692 Legal entity [axis] Axis dei:LegalEntityAxis
693 Entity [Domain] Member dei:EntityDomain
694 Disclosure of Provisions [line items] LineItems obe:DisclosureOfProvisionsLineItems
695 Balance, beginning of year Concept (Monetary) As Of Credit ifrs-full:ProvisionForDecommissioningRestorationAndRehabilitationCosts
696 Net liabilities added (disposed) Concept (Monetary) For Period Debit obe:IncreaseDecreaseThroughDispositionOfAssetsProvisions
697 Decrease due to changes in estimates Concept (Monetary) For Period Debit obe:IncreaseDecreaseInDecommissioningLiabilityDueToChangesInEstimates
698 Liabilities settled Concept (Monetary) For Period Debit obe:ProvisionsSettledOrAssetsDecommissioned
699 Transfers to liabilities for assets held for sale Concept (Monetary) For Period Debit ifrs-full:DecreaseThroughTransferToLiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSaleOtherProvisions
700 Accretion charges Concept (Monetary) For Period Credit obe:IncreaseDueToAccretionProvisions
701 Balance, end of year Concept (Monetary) As Of Credit ifrs-full:ProvisionForDecommissioningRestorationAndRehabilitationCosts
702 Current portion Concept (Monetary) As Of Credit ifrs-full:ShorttermProvisionForDecommissioningRestorationAndRehabilitationCosts
703 Long-term portion Concept (Monetary) As Of Credit ifrs-full:LongtermProvisionForDecommissioningRestorationAndRehabilitationCosts
704 1063 - Disclosure - Provisions - Summary of Changes to Decommissioning Liability (Parenthetical) (Detail) Network

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705 Disclosure of Provisions [table] Table

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706 Legal entity [axis] Axis dei:LegalEntityAxis
707 Entity [Domain] Member dei:EntityDomain
708 Disclosure of Provisions [line items] LineItems obe:DisclosureOfProvisionsLineItems
709 Increase (decrease) in decommissioning liability due to change in discount rate Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughChangeInDiscountRateOtherProvisions
710 1064 - Disclosure - Provisions - Summary of Changes to Office Lease Provision (Detail) Network

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711 Disclosure of Provisions [table] Table

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712 Legal entity [axis] Axis dei:LegalEntityAxis
713 Entity [Domain] Member dei:EntityDomain
714 Disclosure of Provisions [line items] LineItems obe:DisclosureOfProvisionsLineItems
715 Balance, beginning of year Concept (Monetary) As Of Credit obe:OfficeLeaseProvision
716 Net additions (dispositions) Concept (Monetary) For Period Debit obe:OfficeLeaseProvisionNetAdditionsDispositions
717 Decrease due to changes in estimates Concept (Monetary) For Period Credit obe:DecreaseInOfficeLeaseProvisionNetAdditionsDueToChangesInEstimates
718 Settlements Concept (Monetary) For Period Debit obe:OfficeLeaseProvisionCashSettlements
719 Accretion charges Concept (Monetary) For Period Credit obe:OfficeLeaseProvisionAccretionCharges
720 Balance, end of year Concept (Monetary) As Of Credit obe:OfficeLeaseProvision
721 Current portion Concept (Monetary) As Of Credit obe:CurrentOfficeLeaseProvision
722 Long-term portion Concept (Monetary) As Of Credit obe:NoncurrentOfficeLeaseProvision
723 1065 - Disclosure - Risk management - Additional Information (Detail) Network

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724 Disclosure of risk management strategy [table] Table

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725 Legal entity [axis] Axis dei:LegalEntityAxis
726 Entity [Domain] Member dei:EntityDomain
727 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
728 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
729 Senior notes [member] Member obe:SeniorNotes1Member
730 Measurement [axis] Axis ifrs-full:MeasurementAxis
731 Aggregated measurement [member] Member ifrs-full:AggregatedMeasurementMember
732 At fair value [member] Member ifrs-full:AtFairValueMember
733 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
734 Assets [member] Member ifrs-full:ClassesOfAssetsMember
735 Natural gas [member] Member obe:NaturalGasMember
736 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
737 Risks [member] Member ifrs-full:TypesOfRisksMember
738 Pound sterling cross currency swap [member] Member obe:PoundSterlingCrossCurrencySwapsMember
739 Past due status [axis] Axis ifrs-full:PastDueStatusAxis
740 Past due status [member] Member ifrs-full:PastDueStatusMember
741 Later than three months [member] Member ifrs-full:LaterThanThreeMonthsMember
742 Disclosure of risk management strategy [line items] LineItems obe:DisclosureOfRiskManagementStrategyLineItems
743 Senior notes Concept (Monetary) As Of Credit ifrs-full:NotesAndDebenturesIssued
744 Pre-tax unrealized risk management, change in price per unit Concept (Decimal) As Of obe:PreTaxUnrealizedRiskManagementChangeInPricePerUnit
745 Pre-tax unrealized risk management, change in price, amount Concept (Monetary) As Of Credit obe:PreTaxUnrealizedRiskManagementChangeInPriceAmount
746 Risk management, description Concept (Text/String) For Period obe:RiskManagementDescription
747 Realized loss Concept (Monetary) For Period Credit obe:RealizedRiskManagementGainLoss
748 Maximum exposure to credit risk Concept (Monetary) As Of ifrs-full:MaximumExposureToCreditRisk
749 Accounts receivable, carrying value Concept (Monetary) As Of Debit ifrs-full:TradeAndOtherCurrentReceivables
750 Derivative financial assets, fair value Concept (Monetary) As Of Debit ifrs-full:DerivativeFinancialAssets
751 Percentage of long term debt instruments exposed to changes in short term interest rates Concept (Percent) For Period obe:PercentageOfLongTermDebtInstrumentsExposedToChangesInShortTermInterestRates
752 Fixed interest rate debt instruments outstanding Concept (Monetary) As Of Credit obe:FixedInterestRateDebtInstrumentsOutstanding
753 Fixed interest rate debt instruments average remaining term Concept (xbrli:durationItemType) For Period obe:FixedInterestRateDebtInstrumentsAverageRemainingTerm
754 Average interest rate Concept (Percent) As Of obe:DebtInstrumentsAverageInterestRate
755 1066 - Disclosure - Risk management - Summary of Reconciliation of Change in Fair Value of Financial Instruments Outstanding (Detail) Network

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

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757 Legal entity [axis] Axis dei:LegalEntityAxis
758 Entity [Domain] Member dei:EntityDomain
759 Measurement [axis] Axis ifrs-full:MeasurementAxis
760 Aggregated measurement [member] Member ifrs-full:AggregatedMeasurementMember
761 At fair value [member] Member ifrs-full:AtFairValueMember
762 Disclosure of detailed information about financial instruments [line items] LineItems ifrs-full:DisclosureOfFinancialInstrumentsLineItems
763 Balance, beginning of year Concept (Monetary) As Of Debit obe:FinancialAssetLiabilities
764 Unrealized gain (loss) on financial instruments: Abstract obe:UnrealizedGainLossOnFinancialInstrumentsAbstract
765 Commodity collars and swaps Concept (Monetary) For Period Credit obe:UnrealizedGainLossOnFinancialInstrumentsCommodityCollarsAndSwaps
766 Foreign exchange forwards Concept (Monetary) For Period Credit obe:UnrealizedGainLossOnFinancialInstrumentsForeignExchangeForwards
767 Cross currency swaps Concept (Monetary) For Period Credit obe:UnrealizedGainLossOnFinancialInstrumentsCrossCurrencySwaps
768 Total fair value, end of year Concept (Monetary) As Of Debit obe:FinancialAssetLiabilities
769 Total fair value consists of the following: Abstract obe:FinancialInstrumentsAbstract
770 Current asset portion Concept (Monetary) As Of Debit ifrs-full:CurrentFinancialAssets
771 Current liability portion Concept (Monetary) As Of Credit ifrs-full:CurrentFinancialLiabilities
772 Non-current asset portion Concept (Monetary) As Of Debit ifrs-full:NoncurrentFinancialAssets
773 Non-current liability portion Concept (Monetary) As Of Credit ifrs-full:NoncurrentFinancialLiabilities
774 Total fair value, end of year Concept (Monetary) As Of Debit obe:FinancialAssetLiabilities
775 1067 - Disclosure - Risk management - Schedule of Financial Instruments Outstanding (Detail) Network

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

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777 Legal entity [axis] Axis dei:LegalEntityAxis
778 Entity [Domain] Member dei:EntityDomain
779 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
780 Assets [member] Member ifrs-full:ClassesOfAssetsMember
781 Crude oil [member] Member obe:CrudeOil1Member
782 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
783 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
784 W T I swaps [member] Member obe:WTISwapsMember
785 Foreign exchange forward contracts on revenue [member] Member obe:ForeignExchangeForwardContractsOnRevenueMember
786 Contract duration [axis] Axis ifrs-full:ContractDurationAxis
787 Contract duration [member] Member ifrs-full:ContractDurationMember
788 Q1 2019 [member] Member obe:RemainingTermQuarterOneTwoThousandNineteenOneMember
789 Q1 2019 [member] Member obe:RemainingTermQuarterOneTwoThousandNineteenTwoMember
790 Q1 2019 [member] Member obe:RemainingTermQuarterOneTwoThousandNineteenThreeMember
791 Jan/19 - Jun/19 [member] Member obe:RemainingTermJanuaryTwoThousandNineteenToJuneTwoThousandNineteenMember
792 Q2 2019 [member] Member obe:RemainingTermQuarterTwoTwoThousandNineteenMember
793 FX swap [member] Member obe:FXSwapMember
794 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
795 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
796 FX swap [member] Member obe:FXSwapMember
797 FX Swap 3 [member] Member obe:FXSwap3Member
798 Disclosure of detailed information about financial instruments [line items] LineItems ifrs-full:DisclosureOfFinancialInstrumentsLineItems
799 Financial instruments, notional volume Concept (Decimal) As Of obe:FinancialInstrumentsNotionalVolume
800 Notional value Concept (Monetary) As Of ifrs-full:NotionalAmount
801 Financial instruments, remaining term, description Concept (Text/String) For Period obe:FinancialInstrumentsRemainingTermDescription
802 Foreign exchange forward rate Concept (Decimal) As Of obe:ForeignExchangeForwardRate
803 Financial instruments, benchmark pricing per unit Concept (Decimal) As Of obe:FinancialInstrumentsBenchmarkPricingPerUnit
804 Financial liabilities, at fair value Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValue
805 Financial Assets, at fair value Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValue
806 1068 - Disclosure - Risk management - Components of Risk Management on Consolidated Statements of Income (Loss) (Detail) Network

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807 Disclosure of nature and extent of risks arising from financial instruments [table] Table

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808 Legal entity [axis] Axis dei:LegalEntityAxis
809 Entity [Domain] Member dei:EntityDomain
810 Disclosure of nature and extent of risks arising from financial instruments [line items] LineItems ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems
811 Realized risk management gain/loss on settlement of commodity contracts/assignment Concept (Monetary) For Period Credit obe:RealizedRiskManagementGainLossOnSettlementOfCommodityContracts
812 Realized risk management gain/loss on settlement of foreign exchange contracts Concept (Monetary) For Period Credit obe:RealizedRiskManagementGainLossOnSettlementOfForeignExchangeContracts
813 Total realized risk management gain (loss) Concept (Monetary) For Period Credit obe:RealizedRiskManagementGainLoss
814 Unrealized risk management gain/loss on commodity contracts Concept (Monetary) For Period Credit obe:UnrealizedRiskManagementGainLossOnCommodityContracts
815 Unrealized risk management gain/loss on foreign exchange contracts Concept (Monetary) For Period Credit obe:UnrealizedRiskManagementGainLossOnForeignExchangeContracts
816 Unrealized risk management gain/loss on cross currency swaps Concept (Monetary) For Period Credit obe:UnrealizedRiskManagementGainLossOnCrossCurrencySwaps
817 Total unrealized risk management gain (loss) Concept (Monetary) For Period Credit obe:UnrealizedRiskManagementGainLoss
818 Risk management gain (loss) Concept (Monetary) For Period Credit obe:RiskManagementGainLoss
819 1069 - Disclosure - Risk management - Disclosure of Detailed Information about Accounts Receivable (Detail) Network

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820 Disclosure of Accounts receivable [table] Table

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821 Legal entity [axis] Axis dei:LegalEntityAxis
822 Entity [Domain] Member dei:EntityDomain
823 Past due status [axis] Axis ifrs-full:PastDueStatusAxis
824 Past due status [member] Member ifrs-full:PastDueStatusMember
825 Current [member] Member ifrs-full:CurrentMember
826 Later than one month and not later than three months [member] Member ifrs-full:LaterThanOneMonthAndNotLaterThanThreeMonthsMember
827 Later than three months [member] Member ifrs-full:LaterThanThreeMonthsMember
828 Disclosure of accounts receivables [line items] LineItems obe:DisclosureOfAccountsReceivablesLineItems
829 Accounts receivables Concept (Monetary) As Of Debit ifrs-full:TradeAndOtherCurrentReceivables
830 1070 - Disclosure - Risk management - Disclosure of Detailed Information about Accounts Receivable (Parenthetical) (Detail) Network

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831 Disclosure of Accounts receivable [table] Table

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832 Assets and liabilities classified as held for sale [axis] Axis ifrs-full:AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis
833 Assets and liabilities not classified as held for sale [member] Member ifrs-full:AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember
834 Disposal groups classified as held for sale [member] Member ifrs-full:DisposalGroupsClassifiedAsHeldForSaleMember
835 Legal entity [axis] Axis dei:LegalEntityAxis
836 Entity [Domain] Member dei:EntityDomain
837 Disclosure of accounts receivables [line items] LineItems obe:DisclosureOfAccountsReceivablesLineItems
838 Accounts receivables Concept (Monetary) As Of Debit ifrs-full:CurrentTradeReceivables
839 1071 - Disclosure - Risk management - Summary of Estimated Future Obligations for Non-Derivative Financial Liabilities (Detail) Network

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840 Disclosure of financial liabilities [table] Table

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ifrs-full:DisclosureOfFinancialLiabilitiesTable
841 Legal entity [axis] Axis dei:LegalEntityAxis
842 Entity [Domain] Member dei:EntityDomain
843 Categories of financial liabilities [axis] Axis ifrs-full:CategoriesOfFinancialLiabilitiesAxis
844 Financial liabilities, category [member] Member ifrs-full:FinancialLiabilitiesCategoryMember
845 2019 [member] Member obe:TwoThousandNineteenMember
846 2020 [member] Member obe:TwoThousandTwentyMember
847 2021 [member] Member obe:TwoThousandTwentyOneMember
848 2022 [member] Member obe:TwoThousandTwentyTwoMember
849 Thereafter [member] Member obe:ThereafterMember
850 Disclosure of financial liabilities [line items] LineItems ifrs-full:DisclosureOfFinancialLiabilitiesLineItems
851 Long-term debt Concept (Monetary) As Of Credit ifrs-full:Borrowings
852 Accounts payable & accrued liabilities Concept (Monetary) As Of Credit obe:AccountsPayableAndAccruedLiabilities
853 Share-based compensation accrual Concept (Monetary) As Of Credit obe:ShareBasedCompensationAccrual
854 Bank overdraft Concept (Monetary) As Of Credit obe:BankOverdraft
855 Total Concept (Monetary) As Of Credit obe:EstimatedFutureObligationsForNonderivativeFinancialLiabilities
856 1072 - Disclosure - Risk management - Summary of Estimated Future Obligations for Non-Derivative Financial Liabilities (Parenthetical) (Detail) Network

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857 Disclosure of financial liabilities [table] Table

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858 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
859 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
860 Syndicated credit facility [member] Member obe:SyndicatedCreditFacilityMember
861 Categories of financial liabilities [axis] Axis ifrs-full:CategoriesOfFinancialLiabilitiesAxis
862 Financial liabilities, category [member] Member ifrs-full:FinancialLiabilitiesCategoryMember
863 2020 [member] Member obe:TwoThousandTwentyMember
864 Legal entity [axis] Axis dei:LegalEntityAxis
865 Entity [Domain] Member dei:EntityDomain
866 Disclosure of financial liabilities [line items] LineItems ifrs-full:DisclosureOfFinancialLiabilitiesLineItems
867 Long-term debt Concept (Monetary) As Of Credit ifrs-full:Borrowings
868 1073 - Disclosure - Revenue - Disclosure of Significant Revenue (Detail) Network

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869 Disclosure of disaggregation of revenue from contracts with customers [table] Table

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871 Entity [Domain] Member dei:EntityDomain
872 Products and services [axis] Axis ifrs-full:ProductsAndServicesAxis
873 Products and services [member] Member ifrs-full:ProductsAndServicesMember
874 Crude oil [member] Member obe:CrudeOilMember
875 Natural gas liquids [member] Member obe:NaturalGasLiquidsMember
876 Natural gas [member] Member obe:NaturalGasMember
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878 Production revenues Concept (Monetary) For Period Credit ifrs-full:RevenueFromContractsWithCustomers
879 Processing fees Concept (Monetary) For Period Credit obe:ProcessingRevenue
880 Other income Concept (Monetary) For Period Credit ifrs-full:OtherIncome
881 Oil and natural gas sales and other income Concept (Monetary) For Period Credit obe:RevenueFromSaleOfOilGasProductsAndOtherIncome
882 1074 - Disclosure - Revenue - Additional Information (Detail) Network

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883 Disclosure of disaggregation of revenue from contracts with customers [table] Table

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885 Entity [Domain] Member dei:EntityDomain
886 Products and services [axis] Axis ifrs-full:ProductsAndServicesAxis
887 Products and services [member] Member ifrs-full:ProductsAndServicesMember
888 Natural gas liquids [member] Member obe:NaturalGasLiquidsMember
889 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
890 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
891 Northern Border Ventura [member] Member obe:NorthernBorderVenturaMember
892 Disclosure of disaggregation of revenue from contracts with customers [line items] LineItems ifrs-full:DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems
893 Other income Concept (Monetary) For Period Credit ifrs-full:OtherIncome
894 1075 - Disclosure - Income taxes - Summary of Provision for Income Taxes (Detail) Network

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895 Disclosure representing major components of tax expense income [table] Table

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897 Entity [Domain] Member dei:EntityDomain
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899 Deferred tax recovery Concept (Monetary) For Period ifrs-full:DeferredTaxExpenseIncomeRecognisedInProfitOrLoss
900 1076 - Disclosure - Income taxes - Summary of Provision for Income Taxes Reflects Effective Tax Rate (Detail) Network

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901 Disclosure representing major components of tax expense income [table] Table

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902 Legal entity [axis] Axis dei:LegalEntityAxis
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905 Loss before taxes Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
906 Combined statutory tax rate Concept (Percent) For Period obe:CombinedFederalAndProvincialStatutoryTaxRates
907 Computed income tax recovery Concept (Monetary) For Period Debit ifrs-full:TaxExpenseIncomeAtApplicableTaxRate
908 Increase (decrease) resulting from: Abstract ifrs-full:ReconciliationOfAccountingProfitMultipliedByApplicableTaxRatesAbstract
909 Share-based compensation Concept (Monetary) For Period Debit obe:TaxEffectOfSharebasedCompensation
910 Non-taxable foreign exchange (gain) loss Concept (Monetary) For Period Debit ifrs-full:TaxEffectOfForeignTaxRates
911 Unrecognized deferred tax asset Concept (Monetary) As Of Debit ifrs-full:DeferredTaxAssets
912 Adjustments related to prior years Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDeferredTaxOfPriorPeriods
913 Other Concept (Monetary) For Period Debit ifrs-full:OtherComponentsOfDeferredTaxExpenseIncome
914 Deferred tax recovery Concept (Monetary) For Period ifrs-full:DeferredTaxExpenseIncomeRecognisedInProfitOrLoss
915 1077 - Disclosure - Income taxes - Summary of Net Deferred Income Tax Liability (Detail) Network

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918 Entity [Domain] Member dei:EntityDomain
919 Temporary difference, unused tax losses and unused tax credits [axis] Axis ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis
920 Temporary difference, unused tax losses and unused tax credits [member] Member ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember
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922 Risk Management [member] Member obe:RiskManagementMember
923 Decommissioning liability [member] Member obe:DecommissioningLiabilityMember
924 Share-based Compensation [member] Member obe:ShareBasedCompensationMember
925 Non-capital Losses [member] Member obe:NoncapitalLossesMember
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928 Provision (Recovery) in Income Concept (Monetary) For Period ifrs-full:DeferredTaxExpenseIncomeRecognisedInProfitOrLoss
929 Recognized in Property, Plant and Equipment Concept (Monetary) For Period Debit obe:DeferredTaxExpenseIncomeRecognisedInPropertyPlantAndEquipment
930 Ending Balance Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
931 1078 - Disclosure - Income Taxes - Additional Information (Detail) Network

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

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934 Entity [Domain] Member dei:EntityDomain
935 Disclosure of temporary difference, unused tax losses and unused tax credits [line items] LineItems ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
936 Tax pool Concept (Monetary) For Period Debit obe:TaxReservePool
937 Non-capital losses Concept (Monetary) For Period Debit obe:NonCapitalLosses
938 Non-capital losses for which deferred tax asset has not been recognized Concept (Monetary) For Period Debit obe:NoncapitalLossesWithRespectToDeferredTaxAssetThatHasNotBeenRecognized
939 Realized and unrealized net capital losses Concept (Monetary) As Of Credit obe:RealizedAndUnrealizedNetCapitalLosses
940 1079 - Disclosure - Shareholders' equity - Additional Information (Detail) Network

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941 Disclosure of classes of share capital [table] Table

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943 Entity [Domain] Member dei:EntityDomain
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947 Preferred shares [member] Member ifrs-full:PreferenceSharesMember
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949 Number of authorized preferred shares Concept (Shares) As Of ifrs-full:NumberOfSharesAuthorised
950 Number of authorized common shares Concept (Text/String) For Period obe:DescriptionOfNumberOfSharesAuthorised
951 Number of shares issued Concept (Shares) As Of ifrs-full:NumberOfSharesIssued
952 Number of shares outstanding Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
953 1080 - Disclosure - Shareholders' equity - Summary of Issued Capital (Detail) Network

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954 Disclosure of classes of share capital [table] Table

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956 Entity [Domain] Member dei:EntityDomain
957 Classes of share capital [axis] Axis ifrs-full:ClassesOfShareCapitalAxis
958 Share capital [member] Member ifrs-full:ClassesOfShareCapitalMember
959 Common shares [member] Member ifrs-full:OrdinarySharesMember
960 Disclosure of classes of share capital [line items] LineItems ifrs-full:DisclosureOfClassesOfShareCapitalLineItems
961 Balance, beginning of year Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
962 Issued on exercise of equity compensation plans Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions
963 Elimination of deficit Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity
964 Balance, end of year Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
965 Balance, beginning of year Concept (Shares) As Of ifrs-full:NumberOfSharesIssued
966 Issued on exercise of equity compensation plans Concept (Shares) For Period obe:NumberOfSharesOnIssuedExerciseOfEquityCompensationPlans
967 Balance, end of year Concept (Shares) As Of ifrs-full:NumberOfSharesIssued
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969 Disclosure of reserves within equity [table] Table

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971 Entity [Domain] Member dei:EntityDomain
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973 Balance, beginning of year Concept (Monetary) As Of Credit ifrs-full:OtherReserves
974 Share-based compensation expense Concept (Monetary) For Period Credit obe:IncreaseDecreaseOnOtherReservesThroughSharebasedCompensationExpense
975 Net benefit on options exercised Concept (Monetary) For Period Credit obe:IncreaseDecreaseOnOtherReservesThroughNetBenefitOnOptionsExercised
976 Balance, end of year Concept (Monetary) As Of Credit ifrs-full:OtherReserves
977 1082 - Disclosure - Share-based compensation - Summary of Restricted Share Units Plan (Detail) Network

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

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980 Entity [Domain] Member dei:EntityDomain
981 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
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983 Restricted share unit plan [member] Member obe:RestrictedShareUnitPlanMember
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985 Outstanding, beginning of year Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
986 Granted Concept (Decimal) For Period ifrs-full:NumberOfInstrumentsOtherEquityInstrumentsGranted
987 Vested Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
988 Forfeited Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement
989 Outstanding, end of year Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
990 Outstanding units - liability method Concept (Decimal) For Period obe:NumberOfShareUnitLiabilityMethod
991 Outstanding units - equity method Concept (Decimal) For Period obe:NumberOfShareUnitEquityMethod
992 Current liability (1) Concept (Monetary) As Of Credit ifrs-full:CurrentRecognisedLiabilitiesDefinedBenefitPlan
993 Non-current liability Concept (Monetary) As Of Credit ifrs-full:NoncurrentRecognisedLiabilitiesDefinedBenefitPlan
994 1083 - Disclosure - Share-based compensation - Summary of Weighted Average Assumptions of RPSU Plan Units Under Equity Method (Detail) Network

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

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997 Entity [Domain] Member dei:EntityDomain
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1000 Restricted share unit plan [member] Member obe:RestrictedShareUnitPlanMember
1001 Disclosure of terms and conditions of share-based payment arrangement [line items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
1002 Average fair value of units granted (per unit) Concept (Share) For Period obe:WeightedAverageSharePriceOtherEquityInstrumentsGranted
1003 Expected life of units (years) Concept (Text/String) For Period obe:DescriptionOfUnitsLifeShareOtherEquityInstrumentsGranted
1004 Expected forfeiture rate Concept (Percent) For Period obe:DescriptionOfExpectedForfeitureRateOtherEquityInstrumentsGranted
1005 1084 - Disclosure - Share-based compensation - Summary of Performance Share Unit Plan (Detail) Network

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1006 Disclosure of terms and conditions of share-based payment arrangement [table] Table

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1008 Entity [Domain] Member dei:EntityDomain
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1013 Plan Name 1 [domain] Member obe:PlanName1Domain
1014 Options granted from June 2017 [member] Member obe:OptionsGrantedFromJuneTwoThousandSeventeenMember
1015 Options granted prior to June 2017 [member] Member obe:OptionsGrantedPriorToJuneTwoThousandSeventeenMember
1016 Disclosure of terms and conditions of share-based payment arrangement [line items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
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1018 Granted Concept (Decimal) For Period ifrs-full:NumberOfInstrumentsOtherEquityInstrumentsGranted
1019 Vested Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
1020 Forfeited Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement
1021 Outstanding, end of year Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1022 Non-current liability Concept (Monetary) As Of Credit ifrs-full:NoncurrentRecognisedLiabilitiesDefinedBenefitPlan
1023 1085 - Disclosure - Share-based compensation - Summary of Stock Option Activity and Related Information (Detail) Network

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1024 Disclosure of terms and conditions of share-based payment arrangement [table] Table

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1026 Entity [Domain] Member dei:EntityDomain
1027 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1028 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
1029 Options [member] Member obe:ShareOptionPlanMember
1030 Disclosure of terms and conditions of share-based payment arrangement [line items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
1031 Number of Options Outstanding, beginning of year Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
1032 Number of Options, Exercised Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsExercisedInSharebasedPaymentArrangement
1033 Number of Options, Forfeited Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement
1034 Number of Options Outstanding, end of year Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
1035 Number of Options Exercisable, end of year Concept (Decimal) As Of ifrs-full:NumberOfShareOptionsExercisableInSharebasedPaymentArrangement
1036 Weighted Average Exercise Price Outstanding, beginning of year Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
1037 Weighted Average Exercise Price, Exercised Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement
1038 Weighted Average Exercise Price, Forfeited Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsForfeitedInSharebasedPaymentArrangement
1039 Weighted Average Exercise Price, Outstanding, end of year Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
1040 Weighted Average Exercise Price, Exercisable, end of year Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement
1041 1086 - Disclosure - Share-based compensation - Summary of Options Outstanding and Exercisable (Detail) Network

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1042 Disclosure of terms and conditions of share-based payment arrangement [table] Table

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1044 Entity [Domain] Member dei:EntityDomain
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1047 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
1048 Top of range [member] Member ifrs-full:TopOfRangeMember
1049 Ranges of exercise prices for outstanding share options [axis] Axis ifrs-full:RangesOfExercisePricesForOutstandingShareOptionsAxis
1050 Ranges of exercise prices for outstanding share options [member] Member ifrs-full:RangesOfExercisePricesForOutstandingShareOptionsMember
1051 $1.00-$1.99 [member] Member obe:RangesOfExercisePricesForOutstandingShareOptionsOneMember
1052 $2.00-4.99 [member] Member obe:RangesOfExercisePricesForOutstandingShareOptionsTwoMember
1053 $5.00-$9.99 [member] Member obe:RangesOfExercisePricesForOutstandingShareOptionsThreeMember
1054 Disclosure of terms and conditions of share-based payment arrangement [line items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
1055 Range of Grant Prices Concept (Monetary) As Of ifrs-full:ExercisePriceOfOutstandingShareOptions
1056 Number of Options Outstanding Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
1057 Options Outstanding, Weighted Average Exercise Price Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
1058 Options Outstanding, Weighted Remaining Contractual Life(years) Concept (Decimal) As Of ifrs-full:WeightedAverageRemainingContractualLifeOfOutstandingShareOptions
1059 Number of Options Exercisable Concept (Decimal) As Of ifrs-full:NumberOfShareOptionsExercisableInSharebasedPaymentArrangement
1060 Options Exercisable, Weighted Average Exercise Price Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement
1061 1087 - Disclosure - Share-based compensation - Additional Information (Detail) Network

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1062 Disclosure of classes of share capital [table] Table

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1064 Entity [Domain] Member dei:EntityDomain
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1067 Deferred share unit [member] Member obe:DeferredShareUnitMember
1068 Maturity [axis] Axis ifrs-full:MaturityAxis
1069 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
1070 2020 [member] Member ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
1071 After year two [member] Member obe:AfterYearTwoMember
1072 Disclosure of classes of share capital [line items] LineItems ifrs-full:DisclosureOfClassesOfShareCapitalLineItems
1073 Number of options outstanding, Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1074 Current liability Concept (Monetary) As Of Credit ifrs-full:CurrentRecognisedLiabilitiesDefinedBenefitPlan
1075 Weighted average share price Concept (Monetary) For Period ifrs-full:WeightedAverageSharePrice
1076 Employer contributions to employee retirement savings plan percentage of employee contribution Concept (Percent) For Period obe:EmployerContributionsToEmployeeRetirementSavingsPlanPercentageOfEmployeeContribution
1077 Percentage of employees contribution Concept (Percent) For Period obe:PercentageOfEmployeesContribution
1078 1088 - Disclosure - Share-based compensation - Summary of Share-Based Compensation (Detail) Network

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1079 Disclosure of terms and conditions of share-based payment arrangement [table] Table

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1080 Legal entity [axis] Axis dei:LegalEntityAxis
1081 Entity [Domain] Member dei:EntityDomain
1082 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1083 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
1084 Options [member] Member obe:ShareOptionPlanMember
1085 PSU Plan [member] Member obe:PerformanceShareUnitPlanMember
1086 RPSU Plan - equity method [member] Member obe:RestrictedAndPerformanceShareUnitPlanEquityMethodMember
1087 RPSU Plan - liability method [member] Member obe:RestrictedAndPerformanceShareUnitPlanLiabilityMethodMember
1088 Disclosure of terms and conditions of share-based payment arrangement [line items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
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1090 1089 - Disclosure - Per share amounts - Disclosure of Detailed Information about Net Loss Basic and Diluted (Detail) Network

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1091 Earnings per share [table] Table

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1095 Net loss - basic and diluted Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
1096 1090 - Disclosure - Per share amounts - Disclosure of Detailed Information about Weighted Average Number of Shares Per Share (Detail) Network

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1097 Earnings per share [table] Table

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1098 Legal entity [axis] Axis dei:LegalEntityAxis
1099 Entity [Domain] Member dei:EntityDomain
1100 Earnings per share [line items] LineItems ifrs-full:EarningsPerShareLineItems
1101 Basic and Diluted Concept (Shares) For Period ifrs-full:WeightedAverageShares
1102 1091 - Disclosure - Per share amounts - Additional Information (Detail) Network

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1103 Earnings per share [table] Table

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1104 Legal entity [axis] Axis dei:LegalEntityAxis
1105 Entity [Domain] Member dei:EntityDomain
1106 Earnings per share [line items] LineItems ifrs-full:EarningsPerShareLineItems
1107 Anti-dilutive securities issued under option plan Concept (Shares) For Period obe:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount1
1108 1092 - Disclosure - Changes in non-cash working capital (increase) decrease - Summary of Changes in Non-cash Working Capital (Increase) Decrease (Detail) Network

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1109 Disclosure Of Increase Decrease In Noncash Working Capital [table] Table

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1113 Accounts receivable Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables
1114 Other current assets Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInOtherAssets
1115 Deferred funding asset Concept (Monetary) For Period Debit obe:AdjustmentsForIncreaseDecreaseInDeferredFundingAsset
1116 Accounts payable and accrued liabilities Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables
1117 Net changes in non cash working capital Concept (Monetary) For Period Debit obe:NetChangesInNonCashWorkingCapital
1118 Operating activities Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseInWorkingCapital
1119 Investing activities Concept (Monetary) For Period Debit obe:IncreaseDecreaseInWorkingCapitalClassifiedAsInvestingActivities
1120 Net changes in non cash working capital Concept (Monetary) For Period Debit obe:NetChangesInNonCashWorkingCapital
1121 Interest paid Concept (Monetary) For Period Credit obe:InterestPaid1
1122 Income taxes recovered Concept (Monetary) For Period Credit ifrs-full:IncomeTaxesPaidRefund
1123 1093 - Disclosure - Changes in non-cash working capital (increase) decrease - Summary of Changes in Non-cash Working Capital (Increase) Decrease (Parenthetical) (Detail) Network

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1124 Disclosure Of Increase Decrease In Noncash Working Capital [table] Table

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1125 Assets and liabilities classified as held for sale [axis] Axis ifrs-full:AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis
1126 Assets and liabilities not classified as held for sale [member] Member ifrs-full:AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember
1127 Current assets held for sale [member] Member obe:CurrentAssetsHeldForSaleMember
1128 Legal entity [axis] Axis dei:LegalEntityAxis
1129 Entity [Domain] Member dei:EntityDomain
1130 Disclosure of Increase Decrease In Non-cash Working Capital [line items] LineItems obe:DisclosureOfIncreaseDecreaseInNoncashWorkingCapitalLineItems
1131 Accounts receivable Concept (Monetary) As Of Debit ifrs-full:CurrentTradeReceivables
1132 Accounts payable and accrued liabilities Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayables
1133 1094 - Disclosure - Capital management - Summary of Financial Covenants Under Lending Agreements (Detail) Network

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1134 Disclosure of objectives, policies and processes for managing capital [table] Table

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1137 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
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1139 Bank overdraft [member] Member obe:BankOverdraftMember
1140 Letters of credit [member] Member obe:LettersOfCreditMember
1141 Senior debt and total debt [member] Member obe:SeniorDebtMember
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1143 Long-term debt Concept (Monetary) As Of Credit ifrs-full:Borrowings
1144 Components of capital Abstract obe:ComponentsOfCapitalAbstract
1145 Shareholders' equity Concept (Monetary) As Of Credit ifrs-full:Equity
1146 Long-term debt Concept (Monetary) As Of Credit ifrs-full:Borrowings
1147 Ratios Abstract obe:CovenantRatiosAbstract
1148 Senior debt to Adjusted EBITDA Concept (Pure) As Of obe:SeniorDebtToAdjustedEarningsBeforeInterestTaxesDepreciationAndAmortizationConversionRatio
1149 Total debt to Adjusted EBITDA Concept (Pure) As Of obe:DebtToAdjustedEarningsBeforeInterestTaxesDepreciationAndAmortizationConversionRatio
1150 Senior debt to capitalization Concept (Percent) As Of obe:SeniorDebtToCapitalizationConversionRatio
1151 Total debt to capitalization Concept (Percent) As Of obe:DebtToCapitalizationConversionRatio
1152 Priority debt to consolidated tangible assets Concept (Percent) As Of obe:PriorityDebtToConsolidatedTangibleAssetsRatio
1153 Adjusted EBITDA Concept (Monetary) For Period Credit obe:EarningsBeforeInterestTaxDepreciationAndAmortization
1154 Long-term debt Concept (Monetary) As Of Credit ifrs-full:Borrowings
1155 Total shareholders' equity Concept (Monetary) As Of Credit ifrs-full:Equity
1156 Total capitalization Concept (Monetary) As Of Credit obe:Capital1
1157 1095 - Disclosure - Capital management - Summary of Financial Covenants Under Lending Agreements (Parenthetical) (Detail) Network

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1158 Disclosure of objectives, policies and processes for managing capital [table] Table

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1161 Range [axis] Axis ifrs-full:RangeAxis
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1163 Top of range [member] Member ifrs-full:TopOfRangeMember
1164 Disclosure of objectives, policies and processes for managing capital [line items] LineItems ifrs-full:DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalLineItems
1165 Senior debt to EBITDA Concept (Pure) As Of obe:SeniorDebtToAdjustedEarningsBeforeInterestTaxesDepreciationAndAmortizationConversionRatio
1166 Total debt to EBITDA Concept (Pure) As Of obe:DebtToAdjustedEarningsBeforeInterestTaxesDepreciationAndAmortizationConversionRatio
1167 Maximum senior debt to capitalization Concept (Percent) As Of obe:MaximumSeniorDebtToCapitalizationConversionRatio
1168 Maximum total debt to capitalization Concept (Percent) As Of obe:MaximumDebtToCapitalizationConversionRatio
1169 Maximum priority debt to consolidated tangible assets Concept (Percent) As Of obe:MaximumPriorityDebtToConsolidatedTangibleAssetsRatio
1170 Bank EBITDA Concept (Text Block (HTML)) For Period obe:BankEarningsBeforeInterestTaxDepreciationAndAmortizationExplanatory
1171 1096 - Disclosure - Commitments and contingencies - Summary of Certain Payments Over the Next Five Years (Detail) Network

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1172 Disclosure Of Commitments And Contingencies [table] Table

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1173 Legal entity [axis] Axis dei:LegalEntityAxis
1174 Entity [Domain] Member dei:EntityDomain
1175 Maturity [axis] Axis ifrs-full:MaturityAxis
1176 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
1177 2019 [member] Member ifrs-full:LaterThanOneYearMember
1178 2020 [member] Member ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
1179 2021 [member] Member ifrs-full:LaterThanTwoYearsAndNotLaterThanThreeYearsMember
1180 2022 [member] Member ifrs-full:LaterThanThreeYearsAndNotLaterThanFourYearsMember
1181 2023 [member] Member ifrs-full:LaterThanFourYearsAndNotLaterThanFiveYearsMember
1182 Thereafter [member] Member ifrs-full:LaterThanFiveYearsMember
1183 Disclosure of commitments and contingencies [line items] LineItems obe:DisclosureOfCommitmentsAndContingenciesLineItems
1184 Long-term debt Concept (Monetary) As Of Credit ifrs-full:Borrowings
1185 Transportation Concept (Monetary) As Of Credit obe:TransportationCommitments
1186 Power infrastructure Concept (Monetary) As Of Credit obe:PowerInfrastructureCommitments
1187 Interest obligations Concept (Monetary) As Of Credit obe:InterestObligations
1188 Office lease Concept (Monetary) As Of Credit obe:OfficeLeaseCommitments
1189 Decommissioning liability Concept (Monetary) As Of Credit obe:DecommissioningLiability
1190 Total Concept (Monetary) As Of Credit obe:CommittedCashPayments
1191 1097 - Disclosure - Commitments and contingencies - Summary of Certain Payments Over the Next Five Years (Parenthetical) (Detail) Network

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1192 Disclosure Of Commitments And Contingencies [table] Table

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1193 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
1194 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
1195 Bankers acceptances and prime rate loans [member] Member obe:BankersAcceptancesAndPrimeRateLoansMember
1196 Legal entity [axis] Axis dei:LegalEntityAxis
1197 Entity [Domain] Member dei:EntityDomain
1198 Maturity [axis] Axis ifrs-full:MaturityAxis
1199 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
1200 2020 [member] Member ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
1201 Disclosure of commitments and contingencies [line items] LineItems obe:DisclosureOfCommitmentsAndContingenciesLineItems
1202 Long-term debt Concept (Monetary) As Of Credit ifrs-full:Borrowings
1203 1098 - Disclosure - Commitments and contingencies - Additional Information (Detail) Network

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1204 Disclosure Of Commitments And Contingencies [table] Table

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1206 Entity [Domain] Member dei:EntityDomain
1207 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
1208 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
1209 Senior notes [member] Member obe:SeniorNotes1Member
1210 Period Type [axis] Axis obe:PeriodTypeAxis
1211 Period Type [domain] Member obe:PeriodTypeDomain
1212 October 2018 [member] Member obe:OctoberTwoThousandEighteenMember
1213 July 2019 [member] Member obe:JulyTwoThousandNineteenMember
1214 July 2020 [member] Member obe:JulyTwoThousandTwentyMember
1215 Disclosure of commitments and contingencies [line items] LineItems obe:DisclosureOfCommitmentsAndContingenciesLineItems
1216 Amount of outstanding funds Concept (Monetary) As Of Credit ifrs-full:Borrowings
1217 Senior notes, maturity Concept (Text/String) For Period ifrs-full:BorrowingsMaturity
1218 Sublease recoveries Concept (Monetary) For Period Credit obe:SubleaseRecoveries
1219 Lease costs, net of recoveries Concept (Monetary) For Period Debit obe:LeaseCostsNetOfRecoveries
1220 Payment in respect of settlement agreements Concept (Monetary) As Of Credit ifrs-full:LegalProceedingsProvision
1221 1099 - Disclosure - Related-party transactions - Summary of Compensation of Key Management Personnel (Detail) Network

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1222 Disclosure of transactions between related parties [table] Table

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1223 Legal entity [axis] Axis dei:LegalEntityAxis
1224 Entity [Domain] Member dei:EntityDomain
1225 Disclosure of transactions between related parties [line items] LineItems ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
1226 Salary and employee benefits Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationShorttermEmployeeBenefits
1227 Termination benefits Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationTerminationBenefits
1228 Share-based payments Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationSharebasedPayment
1229 Key Management Personnel Compensation Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensation
1230 1100 - Disclosure - Supplemental Items - Additional Information (Detail) (Detail) Network

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1231 Supplemental information [table] Table

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1232 Legal entity [axis] Axis dei:LegalEntityAxis
1233 Entity [Domain] Member dei:EntityDomain
1234 Statement of comprehensive income, profit or loss location [axis] Axis obe:StatementOfComprehensiveIncomeProfitOrLossLocationAxis
1235 Statement of comprehensive income, profit or loss location [member] Member obe:StatementOfComprehensiveIncomeProfitOrLossLocationMember
1236 Operating expense [member] Member obe:OperatingExpenseMember
1237 General and administrative expense [member] Member obe:GeneralAndAdministrativeExpenseMember
1238 Supplemental Information [line items] LineItems obe:SupplementalInformationLineItems
1239 Employee compensation costs Concept (Monetary) For Period Debit ifrs-full:EmployeeBenefitsExpense
1240 1101 - Disclosure - Supplementary Oil and Gas Information - (Unaudited) - Net Proved Oil and Natural Gas Reserves (Detail) Network

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1241 Proved Developed and Undeveloped Oil and Gas Reserve Quantities [Table] Table

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1243 Entity [Domain] Member dei:EntityDomain
1244 Petroleum Reserves [Axis] Axis srt:ReserveQuantitiesByTypeOfReserveAxis
1245 Type of Reserve [Domain] Member srt:TypeOfReserveDomain
1246 Light and medium crude oil [member] Member obe:LightAndMediumCrudeOilMember
1247 Heavy crude oil and bitumen [member] Member obe:HeavyCrudeOilAndBitumenMember
1248 Natural gas [member] Member srt:NaturalGasReservesMember
1249 Natural gas liquids [member] Member srt:NaturalGasLiquidsReservesMember
1250 Barrels of oil equivalent [member] Member obe:BarrelsOfOilEquivalentMember
1251 Reserve Quantities [Line Items] LineItems srt:ReserveQuantitiesLineItems
1252 Beginning balance Concept (num:volumeItemType) As Of srt:ProvedDevelopedAndUndevelopedReservesNet
1253 Extensions & Discoveries Concept (num:volumeItemType) For Period srt:ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
1254 Improved Recovery & Infill Drilling Concept (num:volumeItemType) For Period obe:ProvedDevelopedAndUndevelopedReservesImprovedRecoveryAndInfillDrilling
1255 Technical Revisions Concept (num:volumeItemType) For Period srt:ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
1256 Acquisitions Concept (num:volumeItemType) For Period srt:ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace
1257 Dispositions Concept (num:volumeItemType) For Period srt:ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace
1258 Production Concept (num:volumeItemType) For Period srt:ProvedDevelopedAndUndevelopedReservesProduction
1259 Change for the year Concept (num:volumeItemType) For Period srt:ProvedDevelopedAndUndevelopedReservesNetPeriodIncreaseDecrease
1260 Ending balance Concept (num:volumeItemType) As Of srt:ProvedDevelopedAndUndevelopedReservesNet
1261 Developed Concept (num:volumeItemType) As Of srt:ProvedDevelopedReservesVolume
1262 Undeveloped Concept (num:volumeItemType) As Of srt:ProvedUndevelopedReserveVolume
1263 1102 - Disclosure - Supplementary Oil and Gas Information - (Unaudited) - Capitalized Costs (Detail) Network

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1264 Capitalized Costs Relating To Oil And Gas Producing Activities By Geographic Area [table] Table

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1267 Capitalized Costs Relating To Oil and Gas Producing Activities By Geographic Area [line items] LineItems obe:CapitalizedCostsRelatingToOilAndGasProducingActivitiesByGeographicAreaLineItems
1268 Proved oil and gas properties Concept (Monetary) As Of Debit obe:CapitalizedCostsProvedProperties
1269 Unproved oil and gas properties Concept (Monetary) As Of Debit obe:CapitalizedCostsUnprovedProperties
1270 Total capitalized costs Concept (Monetary) As Of Debit obe:CapitalizedCostsOilAndGasProducingActivitiesGross
1271 Accumulated depletion and depreciation Concept (Monetary) As Of Credit obe:CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities
1272 Net capitalized costs Concept (Monetary) As Of Debit obe:CapitalizedCostsOilAndGasProducingActivitiesNet
1273 1103 - Disclosure - Supplementary Oil and Gas Information - (Unaudited) - Costs Incurred (Detail) Network

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1274 CostsIncurred In Oil And Gas Property Acquisition Exploration And Development Activities [table] Table

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1277 Costs Incurred Oil And Gas Property Acquisition Exploration And Development Activities [line items] LineItems obe:CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivitiesLineItems
1278 Proved oil and gas properties - acquisitions Concept (Monetary) For Period Credit obe:CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves
1279 Proved oil and gas properties - dispositions Concept (Monetary) For Period Credit obe:CostsIncurredDispositionOfOilAndGasPropertiesWithProvedReserves
1280 Unproved oil and gas properties Concept (Monetary) For Period Debit obe:CostsIncurredAcquisitionOfUnprovedOilAndGasProperties
1281 Exploration costs Concept (Monetary) For Period Debit obe:CostsIncurredExplorationCosts
1282 Development costs Concept (Monetary) For Period Debit obe:CostsIncurredDevelopmentCosts
1283 Joint venture, carried capital Concept (Monetary) For Period Credit obe:CostsIncurredJointVentureCarriedCapital
1284 Capital expenditures Concept (Monetary) For Period Debit obe:CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities
1285 Corporate acquisitions Concept (Monetary) For Period Debit obe:CostsIncurredCorporateAcquisition
1286 Total expenditures Concept (Monetary) For Period Debit obe:CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivitiesIncludingCorporateAcquisitions
1287 1104 - Disclosure - Supplementary Oil and Gas Information - (Unaudited) - Additional Information (Detail) Network

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1288 Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Table] Table

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1290 Entity [Domain] Member dei:EntityDomain
1291 Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] LineItems srt:DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesLineItems
1292 Discounted future net cash flows, annual discount factor Concept (Percent) For Period obe:DiscountedFutureNetCashFlowsAnnualDiscountFactor
1293 1105 - Disclosure - Supplementary Oil and Gas Information - (Unaudited) - Standardized Measure of Discounted Future Net Cash Flows (Detail) Network

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1294 Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Table] Table

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1295 Legal entity [axis] Axis dei:LegalEntityAxis
1296 Entity [Domain] Member dei:EntityDomain
1297 Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] LineItems srt:DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesLineItems
1298 Future cash inflows Concept (Monetary) As Of Debit srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows
1299 Future production costs Concept (Monetary) As Of Credit srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts
1300 Future development costs Concept (Monetary) As Of Credit srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts
1301 Undiscounted pre-tax cash flows Concept (Monetary) As Of Debit obe:UndiscountedPretaxCashFlowsRelatingToProvedOilAndGasReserves
1302 Deferred income taxes Concept (Monetary) As Of Credit srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense
1303 Future net cash flows Concept (Monetary) As Of Debit srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows
1304 Less 10% annual discount factor Concept (Monetary) As Of Credit srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows
1305 Standardized measure of discounted future net cash flows Concept (Monetary) As Of Debit srt:StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
1306 1106 - Disclosure - Supplementary Oil and Gas Information - (Unaudited) - Standardized Measure of Discounted Future Net Cash Flow Changes (Detail) Network

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1307 Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Table] Table

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1308 Legal entity [axis] Axis dei:LegalEntityAxis
1309 Entity [Domain] Member dei:EntityDomain
1310 Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] LineItems srt:DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesLineItems
1311 Standardized measure of discounted future net cash flows at beginning of year Concept (Monetary) As Of Debit srt:StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
1312 Oil and gas sales during period net of production costs and royalties Concept (Monetary) For Period Credit srt:SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts
1313 Changes due to prices Concept (Monetary) For Period Debit obe:NetChangesInPrices
1314 Development costs during the period Concept (Monetary) For Period Debit srt:PreviouslyEstimatedDevelopmentCostsIncurred
1315 Changes in forecast development costs Concept (Monetary) For Period Debit srt:IncreaseDecreaseInEstimatedFutureDevelopmentCosts
1316 Changes resulting from extensions, infills and improved recovery Concept (Monetary) For Period Debit obe:StandardizedMeasureOfDiscountedFutureNetCashFlowExtensionsInfillsAndImprovedRecovery
1317 Changes resulting from discoveries Concept (Monetary) For Period Debit obe:StandardizedMeasureOfDiscountedFutureNetCashFlowDiscoveries
1318 Changes resulting from acquisitions of reserves Concept (Monetary) For Period Debit srt:IncreaseDueToPurchasesOfMineralsInPlace
1319 Changes resulting from dispositions of reserves Concept (Monetary) For Period Credit srt:DecreaseDueToSalesOfMineralsInPlace
1320 Accretion of discount Concept (Monetary) For Period Credit srt:StandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesAccretionOfDiscount
1321 Net change in income tax Concept (Monetary) For Period Debit srt:IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves
1322 Changes resulting from other changes and technical reserves revisions plus effects on timing Concept (Monetary) For Period Debit srt:StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOther
1323 Standardized measure of discounted future net cash flows at end of year Concept (Monetary) As Of Debit srt:StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves

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