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965000 - Disclosure - Extractive Industries

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Arc name	presentationArc
Arc role	http://www.xbrl.org/2003/arcrole/parent-child
Link role	http://fasb.org/us-gaap/role/disclosure/ExtractiveIndustries

Concept	Order
Extractive Industries [Abstract] `srt:ExtractiveIndustriesAbstract`
Mineral Industries Disclosures [Abstract] `us-gaap:MineralIndustriesDisclosuresAbstract`	10
Mineral Industries Disclosures [Text Block] `us-gaap:MineralIndustriesDisclosuresTextBlock`	10
Mineral Properties, Net [Abstract] `us-gaap:MineralPropertiesNetAbstract`	10
Mineral Properties, Gross `us-gaap:MineralPropertiesGross`	10
Mineral Rights `us-gaap:MineralRights`	20
Mineral Properties, Accumulated Depletion `us-gaap:MineralPropertiesAccumulatedDepletion`	30
Mineral Properties, Accumulated Impairment `us-gaap:MineralPropertiesAccumulatedImpairment`	40
Mineral Properties, Net `us-gaap:MineralPropertiesNet`	50
Oil and Gas Exploration and Production Industries Disclosures [Abstract] `us-gaap:OilAndGasExplorationAndProductionIndustriesDisclosuresAbstract`	20
Oil and Gas Exploration and Production Industries Disclosures [Text Block] `us-gaap:OilAndGasExplorationAndProductionIndustriesDisclosuresTextBlock`	10
Oil and Gas Property [Abstract] `us-gaap:OilAndGasPropertyAbstract`	10
Oil and Gas Properties [Text Block] `us-gaap:OilAndGasPropertiesTextBlock`	10
Oil and Gas Property, Successful Effort Method, Net [Abstract] `us-gaap:OilAndGasPropertySuccessfulEffortMethodNetAbstract`	10
Oil and Gas Property, Successful Effort Method, Gross [Abstract] `us-gaap:OilAndGasPropertySuccessfulEffortMethodGrossAbstract`	10
Unproved Oil and Gas Property, Successful Effort Method `us-gaap:UnprovedOilAndGasPropertySuccessfulEffortMethod`	10
Proved Oil and Gas Property, Successful Effort Method `us-gaap:ProvedOilAndGasPropertySuccessfulEffortMethod`	20
Oil and Gas Property, Successful Effort Method, Gross `us-gaap:OilAndGasPropertySuccessfulEffortMethodGross`	30
Oil and Gas Property, Successful Effort Method, Accumulated Depreciation, Depletion Amortization and Impairment [Abstract] `us-gaap:OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAmortizationAndImpairmentAbstract`	20
Oil and Gas Property, Successful Effort Method, Accumulated Impairment `us-gaap:OilAndGasPropertySuccessfulEffortMethodAccumulatedImpairment`	10
Oil and Gas Property, Successful Effort Method, Accumulated Depreciation, Depletion and Amortization `us-gaap:OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization`	20
Oil and Gas Property, Successful Effort Method, Accumulated Depreciation, Depletion Amortization and Impairment `us-gaap:OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAmortizationAndImpairment`	30
Other Oil and Gas Property, Successful Effort Method `us-gaap:OtherOilAndGasPropertySuccessfulEffortMethod`	30
Oil and Gas Property, Successful Effort Method, Net `us-gaap:OilAndGasPropertySuccessfulEffortMethodNet`	40
Full Cost Method of Accounting for Investments in Oil and Gas Properties Disclosure [Text Block] `us-gaap:FullCostMethodOfAccountingForInvestmentsInOilAndGasPropertiesDisclosureTextBlock`	20
Schedule of Amortization Expense Per Unit of Production [Table Text Block] `us-gaap:ScheduleOfAmortizationExpensePerUnitOfProductionTextBlock`	10
Amortization Expense Per Unit of Production [Table] `us-gaap:AmortizationExpensePerUnitOfProductionTable`	10
Cost Center [Axis] `us-gaap:AmortizationExpensePerUnitOfProductionByCostCenterAxis`	10
Cost Center for Oil and Gas Disclosures [Domain] `us-gaap:CostCenterForOilAndGasDisclosuresDomain`	10
Amortization Expense Per Equivalent Unit of Production or Per Dollar of Gross Revenue [Line Items] `us-gaap:AmortizationExpensePerEquivalentUnitOfProductionOrPerDollarOfGrossRevenueLineItems`	20
Amortization Expense Per Physical Unit of Production `us-gaap:AmortizationExpensePerPhysicalUnitOfProduction`	10
Amortization Expense Per Dollar of Gross Revenue `us-gaap:AmortizationExpensePerDollarOfGrossRevenue`	20
Schedule of Capitalized Costs of Unproved Properties Excluded from Amortization [Table Text Block] `us-gaap:ScheduleOfCapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationTextBlock`	20
Capitalized Costs of Unproved Properties Excluded from Amortization [Table] `us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationTable`	10
Project [Axis] `us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis`	10
Project [Domain] `us-gaap:ProjectMember`	10
Support Equipment and Facilities [Member] `us-gaap:SupportEquipmentAndFacilitiesMember`	10
Uncompleted Wells Equipment and Facilities [Member] `us-gaap:UncompletedWellsEquipmentAndFacilitiesMember`	20
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] `us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationLineItems`	20
Capitalized Costs of Unproved Properties Excluded from Amortization, Period Cost [Abstract] `us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationAbstract`	10
Acquisition Costs, Period Cost `us-gaap:AcquisitionCosts`	10
Exploration Costs, Period Cost `us-gaap:ExplorationCosts`	20
Development Costs, Period Cost `us-gaap:DevelopmentCosts`	30
Production Costs, Period Cost `us-gaap:ProductionCosts`	40
Capitalized Costs of Unproved Properties Excluded from Amortization, Period Cost `us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization`	50
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative [Abstract] `us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulativeAbstract`	20
Acquisition Costs, Cumulative `us-gaap:AcquisitionCostsCumulative`	10
Exploration Costs, Cumulative `us-gaap:ExplorationCostsCumulative`	20
Development Costs, Cumulative `us-gaap:DevelopmentCostsCumulative`	30
Production Costs, Cumulative `us-gaap:ProductionCostsCumulative`	40
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative `us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative`	50
Description of Current Status of Project `us-gaap:DescriptionOfCurrentStatusOfProject`	30
Anticipated Timing of Inclusion of Costs in Amortization Calculation `us-gaap:AnticipatedTimingOfInclusionOfCostsInAmortizationCalculation`	40
Effects of Using Cash Flow Hedges in Calculating Ceiling Limitations [Table Text Block] `us-gaap:EffectsOfUsingCashFlowHedgesInCalculatingCeilingLimitationsTextBlock`	30
Portion of Future Oil and Gas Production Being Hedged `us-gaap:PortionOfFutureOilAndGasProductionBeingHedged`	10
Effects of Cash Flow Hedges Not Considered in Calculating Ceiling Limitation, Amount `us-gaap:EffectsOfCashFlowHedgesNotConsideredInCalculatingCeilingLimitationAmount`	20
Unamortized Costs Capitalized Exceed Ceiling Limitations [Abstract] `us-gaap:UnamortizedCostsCapitalizedExceedCeilingLimitationsAbstract`	40
Unamortized Costs Capitalized Less Related Deferred Income Taxes Exceed Ceiling Limitations, Cost Center `us-gaap:UnamortizedCostsCapitalizedLessRelatedDeferredIncomeTaxesExceedCeilingLimitationsCostCenter`	10
Unamortized Costs Capitalized Less Related Deferred Income Taxes Exceed Ceiling Limitations, Expense `us-gaap:UnamortizedCostsCapitalizedLessRelatedDeferredIncomeTaxesExceedCeilingLimitationExpense`	20
Unamortized Costs Capitalized Less Related Deferred Income Taxes Exceed Ceiling Limitations, Explanation of Expense Not Charged `us-gaap:UnamortizedCostsCapitalizedLessRelatedDeferredIncomeTaxesExceedCeilingLimitationsExplanationOfExpenseNotCharged`	30
Oil and Gas Property, Full Cost Method, Net [Abstract] `us-gaap:OilAndGasPropertyFullCostMethodNetAbstract`	50
Oil and Gas Property, Full Cost Method, Gross `us-gaap:OilAndGasPropertyFullCostMethodGross`	10
Oil and Gas Property, Full Cost Method, Depletion `us-gaap:OilAndGasPropertyFullCostMethodDepletion`	20
Oil and Gas Property, Full Cost Method, Net `us-gaap:OilAndGasPropertyFullCostMethodNet`	30
Schedule of Proved Developed and Undeveloped Oil and Gas Reserve Quantities [Table Text Block] `srt:ScheduleOfProvedDevelopedAndUndevelopedOilAndGasReserveQuantitiesTextBlock`	20
Proved Developed and Undeveloped Oil and Gas Reserve Quantities [Table] `srt:ProvedDevelopedAndUndevelopedOilAndGasReserveQuantitiesTable`	10
Consolidation Items [Axis] `srt:ConsolidationItemsAxis`	10
Consolidation Items [Domain] `srt:ConsolidationItemsDomain`	10
Reportable Geographical Components [Member] `srt:ReportableGeographicalComponentsMember`	10
Geography Eliminations [Member] `srt:GeographyEliminationsMember`	20
Reportable Legal Entities [Member] `srt:ReportableLegalEntitiesMember`	30
Consolidation, Eliminations [Member] `srt:ConsolidationEliminationsMember`	40
Geographical [Axis] `srt:StatementGeographicalAxis`	20
Geographical [Domain] `srt:SegmentGeographicalDomain`	10
Petroleum Reserves [Axis] `srt:ReserveQuantitiesByTypeOfReserveAxis`	30
Type of Reserve [Domain] `srt:TypeOfReserveDomain`	10
Oil [Member] `srt:OilReservesMember`	10
Natural Gas [Member] `srt:NaturalGasReservesMember`	20
Natural Gas Liquids [Member] `srt:NaturalGasLiquidsReservesMember`	30
Synthetic Oil [Member] `srt:SyntheticOilMember`	40
Synthetic Gas [Member] `srt:SyntheticGasMember`	50
Other Nonrenewable Natural Resources [Member] `srt:OtherNonrenewableNaturalResourcesMember`	60
Legal Entity [Axis] `dei:LegalEntityAxis`	40
Entity [Domain] `dei:EntityDomain`	10
Related Party [Axis] `us-gaap:RelatedPartyTransactionsByRelatedPartyAxis`	50
Related Party [Domain] `us-gaap:RelatedPartyDomain`	10
Consolidated Entities [Member] `us-gaap:ConsolidatedEntitiesMember`	10
Equity Method Investee [Member] `us-gaap:EquityMethodInvesteeMember`	20
Reserve Quantities [Line Items] `srt:ReserveQuantitiesLineItems`	60
Proved Developed Reserves (Volume) `srt:ProvedDevelopedReservesVolume`	10
Proved Developed Reserves (Energy) `srt:ProvedDevelopedReservesBOE1`	20
Proved Undeveloped Reserve (Volume) `srt:ProvedUndevelopedReserveVolume`	30
Proved Undeveloped Reserves (Energy) `srt:ProvedUndevelopedReserveBOE1`	40
Reserve Quantity Attributable to Consolidated Subsidiary, Noncontrolling Interest, Volume `srt:ReserveQuantityAttributableToConsolidatedSubsidiaryNoncontrollingInterestVolume`	50
Reserve Quantity Attributable to Consolidated Subsidiary, Noncontrolling Interest [true false] `srt:ReserveQuantityAttributableToConsolidatedSubsidiaryNoncontrollingInterest`	60
Reserves, Share of Equity Method Investee's Net Proved Oil and Gas Reserves `srt:ReservesShareOfEquityMethodInvesteesNetProvedOilAndGasReserves`	70
Proved Reserve Quantity, Location in Home Country [true false] `srt:ProvedReserveQuantityLocationInHomeCountry`	80
Proved Developed and Undeveloped Reserves [Roll Forward] `srt:IncreaseDecreaseInProvedDevelopedAndUndevelopedReservesRollForward`	90
Proved Developed and Undeveloped Reserves, Net `srt:ProvedDevelopedAndUndevelopedReservesNet`	10
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates `srt:ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease`	20
Proved Developed and Undeveloped Reserves, Improved Recovery `srt:ProvedDevelopedAndUndevelopedReservesImprovedRecovery`	30
Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place `srt:ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace`	40
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions `srt:ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions`	50
Proved Developed and Undeveloped Reserves, Production `srt:ProvedDevelopedAndUndevelopedReservesProduction`	60
Proved Developed and Undeveloped Reserves, Sales of Minerals in Place `srt:ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace`	70
Proved Developed and Undeveloped Reserves, Net, Period Increase (Decrease) `srt:ProvedDevelopedAndUndevelopedReservesNetPeriodIncreaseDecrease`	80
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] `srt:ProvedDevelopedAndUndevelopedReserveEnergyRollForward`	100
Proved Developed and Undeveloped Reserve, Net (Energy) `srt:ProvedDevelopedAndUndevelopedReserveNetEnergy`	10
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy) `srt:ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy`	20
Proved Developed and Undeveloped Reserve, Improved Recovery (Energy) `srt:ProvedDevelopedAndUndevelopedReserveImprovedRecoveryEnergy`	30
Proved Developed and Undeveloped Reserve, Purchase of Mineral in Place (Energy) `srt:ProvedDevelopedAndUndevelopedReservePurchaseOfMineralInPlaceEnergy`	40
Proved Developed and Undeveloped Reserve, Extension and Discovery (Energy) `srt:ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy`	50
Proved Developed and Undeveloped Reserve, Production (Energy) `srt:ProvedDevelopedAndUndevelopedReserveProductionEnergy`	60
Proved Developed and Undeveloped Reserves, Sale of Mineral in Place (Energy) `srt:ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy`	70
Proved Developed and Undeveloped Reserve, Net (Energy), Period Increase (Decrease) `srt:ProvedDevelopedAndUndevelopedReserveNetEnergyPeriodIncreaseDecrease`	80
Significant Changes in Reserves `srt:SignificantChangesInReserves`	110
Long-Term Supply Agreements with Governments or Authorities [Abstract] `srt:LongTermSupplyAgreementsWithGovernmentsOrAuthoritiesAbstract`	120
Proved Oil and Gas Reserve Quantities Applicable to Long-Term Supply Agreements with Governments or Authorities `srt:ProvedOilAndGasReserveQuantitiesApplicableToLongTermSupplyAgreementsWithGovernmentsOrAuthorities`	10
Oil and Gas Quantities Received under Long-Term Supply Agreements with Governments or Authorities `srt:OilAndGasQuantitiesReceivedUnderLongTermSupplyAgreementsWithGovernmentsOrAuthorities`	20
Disclosure of Other Reserve Information [Abstract] `us-gaap:DisclosureOfOtherReserveInformationAbstract`	30
Reserves Related to Royalty Interests Not Available `us-gaap:ReservesRelatedToRoyaltyInterestsNotAvailable`	10
Description of Economic Factors or Significant Uncertainties that May Affect Proved Reserves `us-gaap:DescriptionOfSignificantChangesInReservesQuantitiesOrSignificantFactorsOrUncertaintiesThatMayAffectProvedReserves`	20
Disclosure of Reserve Information for Cost-of-service Oil and Gas Producing Properties of Rate Regulated Companies `us-gaap:DisclosureOfReserveInformationForCostOfServiceOilAndGasProducingPropertiesOfRateRegulatedCompanies`	30
Oil and Gas Producing Properties of Rate Regulated Companies, Proved and Unproved Reserves `us-gaap:OilAndGasProducingPropertiesOfRateRegulatedCompaniesProvedAndUnprovedReserves`	40
Oil and Gas Producing Properties of Rate Regulated Companies, Unamortized Cost `us-gaap:OilAndGasProducingPropertiesOfRateRegulatedCompaniesUnamortizedCost`	50
Capitalized Costs Relating to Oil and Gas Producing Activities Disclosure [Table Text Block] `us-gaap:CapitalizedCostsRelatingToOilAndGasProducingActivitiesDisclosureTextBlock`	40
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Table] `us-gaap:CapitalizedCostsRelatingToOilAndGasProducingActivitiesByGeographicAreaTable`	10
Consolidation Items [Axis] `srt:ConsolidationItemsAxis`	10
Consolidation Items [Domain] `srt:ConsolidationItemsDomain`	10
Reportable Geographical Components [Member] `srt:ReportableGeographicalComponentsMember`	10
Geography Eliminations [Member] `srt:GeographyEliminationsMember`	20
Reportable Legal Entities [Member] `srt:ReportableLegalEntitiesMember`	30
Consolidation, Eliminations [Member] `srt:ConsolidationEliminationsMember`	40
Geographical [Axis] `srt:StatementGeographicalAxis`	20
Geographical [Domain] `srt:SegmentGeographicalDomain`	10
Legal Entity [Axis] `dei:LegalEntityAxis`	30
Entity [Domain] `dei:EntityDomain`	10
Related Party [Axis] `us-gaap:RelatedPartyTransactionsByRelatedPartyAxis`	40
Related Party [Domain] `us-gaap:RelatedPartyDomain`	10
Consolidated Entities [Member] `us-gaap:ConsolidatedEntitiesMember`	10
Equity Method Investee [Member] `us-gaap:EquityMethodInvesteeMember`	20
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] `us-gaap:CapitalizedCostsRelatingToOilAndGasProducingActivitiesByGeographicAreaLineItems`	50
Capitalized Costs, Oil and Gas Producing Activities, Net [Abstract] `us-gaap:CapitalizedCostsOilAndGasProducingActivitiesNetAbstract`	10
Capitalized Costs, Oil and Gas Producing Activities, Gross [Abstract] `us-gaap:CapitalizedCostsOilAndGasProducingActivitiesGrossAbstract`	10
Capitalized Costs, Mineral Interests in Unproved Properties `us-gaap:CapitalizedCostsMineralInterestsInUnprovedProperties`	10
Capitalized Costs, Mineral Interests in Proved Properties `us-gaap:CapitalizedCostsMineralInterestsInProvedProperties`	20
Capitalized Costs, Wells and Related Equipment and Facilities `us-gaap:CapitalizedCostsWellsAndRelatedEquipmentAndFacilities`	30
Capitalized Costs, Support Equipment and Facilities `us-gaap:CapitalizedCostsSupportEquipmentAndFacilities`	40
Capitalized Costs, Uncompleted Wells, Equipment and Facilities `us-gaap:CapitalizedCostsUncompletedWellsEquipmentAndFacilities`	50
Capitalized Costs, Unproved Properties `us-gaap:CapitalizedCostsUnprovedProperties`	60
Capitalized Costs, Proved Properties `us-gaap:CapitalizedCostsProvedProperties`	70
Capitalized Costs, Asset Retirement Costs `us-gaap:CapitalizedCostsAssetRetirementCosts`	80
Capitalized Costs, Oil and Gas Producing Activities, Gross `us-gaap:CapitalizedCostsOilAndGasProducingActivitiesGross`	90
Capitalized Costs, Accumulated Depreciation, Depletion, Amortization and Valuation Allowance Relating to Oil and Gas Producing Activities `us-gaap:CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities`	20
Capitalized Costs, Oil and Gas Producing Activities, Net `us-gaap:CapitalizedCostsOilAndGasProducingActivitiesNet`	30
Cost Incurred in Oil and Gas Property Acquisition, Exploration, and Development Activities Disclosure [Table Text Block] `us-gaap:CostIncurredInOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivitiesDisclosureTextBlock`	50
Costs Incurred in Oil and Gas Property Acquisition, Exploration, and Development Activities [Table] `us-gaap:CostsIncurredInOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivitiesTable`	10
Consolidation Items [Axis] `srt:ConsolidationItemsAxis`	10
Consolidation Items [Domain] `srt:ConsolidationItemsDomain`	10
Reportable Geographical Components [Member] `srt:ReportableGeographicalComponentsMember`	10
Geography Eliminations [Member] `srt:GeographyEliminationsMember`	20
Reportable Legal Entities [Member] `srt:ReportableLegalEntitiesMember`	30
Consolidation, Eliminations [Member] `srt:ConsolidationEliminationsMember`	40
Geographical [Axis] `srt:StatementGeographicalAxis`	20
Geographical [Domain] `srt:SegmentGeographicalDomain`	10
Legal Entity [Axis] `dei:LegalEntityAxis`	30
Entity [Domain] `dei:EntityDomain`	10
Related Party [Axis] `us-gaap:RelatedPartyTransactionsByRelatedPartyAxis`	40
Related Party [Domain] `us-gaap:RelatedPartyDomain`	10
Consolidated Entities [Member] `us-gaap:ConsolidatedEntitiesMember`	10
Equity Method Investee [Member] `us-gaap:EquityMethodInvesteeMember`	20
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] `us-gaap:CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivitiesLineItems`	50
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Abstract] `us-gaap:CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivitiesAbstract`	10
Costs Incurred, Acquisition of Oil and Gas Properties [Abstract] `us-gaap:CostsIncurredAcquisitionOfOilAndGasPropertiesAbstract`	10
Costs Incurred, Acquisition of Unproved Oil and Gas Properties `us-gaap:CostsIncurredAcquisitionOfUnprovedOilAndGasProperties`	10
Costs Incurred, Acquisition of Oil and Gas Properties with Proved Reserves `us-gaap:CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves`	20
Costs Incurred, Acquisition of Oil and Gas Properties `us-gaap:CostsIncurredAcquisitionOfOilAndGasProperties`	30
Costs Incurred, Exploration Costs `us-gaap:CostsIncurredExplorationCosts`	20
Costs Incurred, Development Costs `us-gaap:CostsIncurredDevelopmentCosts`	30
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities `us-gaap:CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities`	40
Significant Costs Incurred to Acquire Mineral Interest of Proved Reserves `us-gaap:SignificantCostsIncurredToAcquireMineralInterestOfProvedReserves`	20
Results of Operations for Oil and Gas Producing Activities Disclosure [Table Text Block] `us-gaap:ResultsOfOperationsForOilAndGasProducingActivitiesDisclosureTextBlock`	60
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Table] `us-gaap:ResultsOfOperationsForOilAndGasProducingActivitiesByGeographicAreaTable`	10
Consolidation Items [Axis] `srt:ConsolidationItemsAxis`	10
Consolidation Items [Domain] `srt:ConsolidationItemsDomain`	10
Reportable Geographical Components [Member] `srt:ReportableGeographicalComponentsMember`	10
Geography Eliminations [Member] `srt:GeographyEliminationsMember`	20
Reportable Legal Entities [Member] `srt:ReportableLegalEntitiesMember`	30
Consolidation, Eliminations [Member] `srt:ConsolidationEliminationsMember`	40
Geographical [Axis] `srt:StatementGeographicalAxis`	20
Geographical [Domain] `srt:SegmentGeographicalDomain`	10
Legal Entity [Axis] `dei:LegalEntityAxis`	30
Entity [Domain] `dei:EntityDomain`	10
Related Party [Axis] `us-gaap:RelatedPartyTransactionsByRelatedPartyAxis`	40
Related Party [Domain] `us-gaap:RelatedPartyDomain`	10
Consolidated Entities [Member] `us-gaap:ConsolidatedEntitiesMember`	10
Equity Method Investee [Member] `us-gaap:EquityMethodInvesteeMember`	20
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items] `us-gaap:ResultsOfOperationsForOilAndGasProducingActivitiesByGeographicAreaLineItems`	50
Results of Operations, Oil and Gas Producing Activities Net Income (Excluding Corporate Overhead and Interest Costs) [Abstract] `us-gaap:ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCostsAbstract`	10
Results of Operations, Income before Income Taxes [Abstract] `us-gaap:ResultsOfOperationsIncomeBeforeIncomeTaxesAbstract`	10
Results of Operations, Revenue from Oil and Gas Producing Activities [Abstract] `us-gaap:ResultsOfOperationsRevenueFromOilAndGasProducingActivitiesAbstract`	10
Results of Operations, Sales Revenue to Unaffiliated Enterprises `us-gaap:ResultsOfOperationsSalesRevenueToUnaffiliatedEnterprises`	10
Results of Operations, Sales or Transfers to Entity's Other Operations `us-gaap:ResultsOfOperationsSalesOrTransfersToEntitysOtherOperations`	20
Results of Operations, Revenue, Other `us-gaap:ResultsOfOperationsRevenueOther`	30
Results of Operations, Revenue from Oil and Gas Producing Activities `us-gaap:ResultsOfOperationsRevenueFromOilAndGasProducingActivities`	40
Results of Operations, Expense from Oil and Gas Producing Activities [Abstract] `us-gaap:ResultsOfOperationsExpenseFromOilAndGasProducingActivitiesAbstract`	20
Results of Operations, Production or Lifting Costs `us-gaap:ResultsOfOperationsProductionOrLiftingCosts`	10
Results of Operations, Exploration Expense `us-gaap:ResultsOfOperationsExplorationExpense`	20
Results of Operations, Dry Hole Costs `us-gaap:ResultsOfOperationsDryHoleCosts`	30
Results of Operations, Transportation Costs `us-gaap:ResultsOfOperationsTransportationCosts`	40
Results of Operations, Depreciation, Depletion and Amortization, and Valuation Provisions `us-gaap:ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions`	50
Results of Operations, Impairment of Oil and Gas Properties `us-gaap:ResultsOfOperationsImpairmentOfOilAndGasProperties`	60
Results of Operations, Accretion of Asset Retirement Obligations `us-gaap:ResultsOfOperationsAccretionOfAssetRetirementObligations`	70
Results of Operations, General and Administrative Related to Oil and Gas Producing Activities `us-gaap:ResultsOfOperationsGeneralAndAdministrativeRelatedToOilAndGasProducingActivities`	80
Results of Operations, Expense, Other `us-gaap:ResultsOfOperationsExpenseOther`	90
Results of Operations, Expense from Oil and Gas Producing Activities `us-gaap:ResultsOfOperationsExpenseFromOilAndGasProducingActivities`	100
Results of Operations, Income before Income Taxes `us-gaap:ResultsOfOperationsIncomeBeforeIncomeTaxes`	30
Results of Operations, Income Tax Expense `us-gaap:ResultsOfOperationsIncomeTaxExpense`	20
Results of Operations, Oil and Gas Producing Activities Net Income (Excluding Corporate Overhead and Interest Costs) `us-gaap:ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts`	30
Standardized Measure of Discounted Future Cash Flows Relating to Proved Reserves Disclosure [Table Text Block] `srt:StandardizedMeasureOfDiscountedFutureCashFlowsRelatingToProvedReservesDisclosureTextBlock`	70
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Table] `srt:DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesTable`	10
Consolidation Items [Axis] `srt:ConsolidationItemsAxis`	10
Consolidation Items [Domain] `srt:ConsolidationItemsDomain`	10
Reportable Geographical Components [Member] `srt:ReportableGeographicalComponentsMember`	10
Geography Eliminations [Member] `srt:GeographyEliminationsMember`	20
Reportable Legal Entities [Member] `srt:ReportableLegalEntitiesMember`	30
Consolidation, Eliminations [Member] `srt:ConsolidationEliminationsMember`	40
Geographical [Axis] `srt:StatementGeographicalAxis`	20
Geographical [Domain] `srt:SegmentGeographicalDomain`	10
Legal Entity [Axis] `dei:LegalEntityAxis`	30
Entity [Domain] `dei:EntityDomain`	10
Related Party [Axis] `us-gaap:RelatedPartyTransactionsByRelatedPartyAxis`	40
Related Party [Domain] `us-gaap:RelatedPartyDomain`	10
Consolidated Entities [Member] `us-gaap:ConsolidatedEntitiesMember`	10
Equity Method Investee [Member] `us-gaap:EquityMethodInvesteeMember`	20
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] `srt:DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesLineItems`	50
Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Abstract] `srt:DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesStandardizedMeasureAbstract`	10
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Net Cash Flows [Abstract] `srt:DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureNetCashFlowsAbstract`	10
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Cash Inflows `srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows`	10
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Development Costs `srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts`	20
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Production Costs `srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts`	30
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Income Tax Expense `srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense`	40
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Net Cash Flows `srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows`	50
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, 10 Percent Annual Discount for Estimated Timing of Cash Flows `srt:FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows`	20
Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves `srt:StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves`	30
Significant Economic Interest in Standardized Measure of Discounted Future Net Cash Flows Attributable to Consolidated Subsidiary(ies) with Significant Noncontrolling Interests `srt:SignificantEconomicInterestInStandardizedMeasureOfDiscountedFutureNetCashFlowsAttributableToConsolidatedSubsidiaryIesWithSignificantMinorityInterests`	20
Schedule of Changes in Standardized Measure of Discounted Future Net Cash Flows [Table Text Block] `srt:ScheduleOfChangesInStandardizedMeasureOfDiscountedFutureNetCashFlowsTableTextBlock`	80
Principal Sources of Change in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Abstract] `srt:PrincipalSourcesOfChangeInStandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesAbstract`	10
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward] `srt:IncreaseDecreaseInStandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesRollForward`	10
Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves `srt:StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves`	10
Net Increase (Decrease) in Sales and Transfer Prices and Production Costs `srt:NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts`	20
Changes in Estimated Future Development Costs `srt:IncreaseDecreaseInEstimatedFutureDevelopmentCosts`	30
Sales and Transfers of Oil and Gas Produced, Net of Production Costs `srt:SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts`	40
Extensions, Discoveries, Additions and Improved Recovery, Less Related Costs `srt:ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts`	50
Increase Due to Purchases of Minerals in Place `srt:IncreaseDueToPurchasesOfMineralsInPlace`	60
Decrease Due to Sales of Minerals in Place `srt:DecreaseDueToSalesOfMineralsInPlace`	70
Previously Estimated Development Costs Incurred `srt:PreviouslyEstimatedDevelopmentCostsIncurred`	80
Revisions of Previous Quantity Estimates `srt:RevisionsOfPreviousQuantityEstimates`	90
Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves, Accretion of Discount `srt:StandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesAccretionOfDiscount`	100
Changes in Future Income Tax Expense Estimates on Future Cash Flows Related to Proved Oil and Gas Reserves `srt:IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves`	110
Standardized Measure of Discounted Future Net Cash Flow of Proved Oil and Gas Reserves, Other `srt:StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOther`	120
Standardized Measure of Discounted Future Net Cash Flow of Proved Oil and Gas Reserves, Period Increase (Decrease) `srt:StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease`	130
Additional Information Necessary to Prevent Disclosure of Discounts Future Net Cash Flows from Being Misleading `srt:AdditionalInformationNecessaryToPreventDisclosureOfDiscountsFutureNetCashFlowsFromBeingMisleading`	20
Oil and Gas, Average Sale Price and Production Cost [Table Text Block] `srt:OilAndGasNetProductionAverageSalesPriceAndAverageProductionCostsDisclosureTextBlock`	90
Oil and Gas, Average Sale Price and Production Cost Per Unit [Table] `srt:AverageSalesPriceAndProductionCostsPerUnitOfProductionTable`	10
Consolidation Items [Axis] `srt:ConsolidationItemsAxis`	10
Consolidation Items [Domain] `srt:ConsolidationItemsDomain`	10
Reportable Geographical Components [Member] `srt:ReportableGeographicalComponentsMember`	10
Geography Eliminations [Member] `srt:GeographyEliminationsMember`	20
Reportable Legal Entities [Member] `srt:ReportableLegalEntitiesMember`	30
Consolidation, Eliminations [Member] `srt:ConsolidationEliminationsMember`	40
Geographical [Axis] `srt:StatementGeographicalAxis`	20
Geographical [Domain] `srt:SegmentGeographicalDomain`	10
Energy [Axis] `srt:EnergyAxis`	30
Energy [Domain] `srt:EnergyDomain`	10
Fuel [Member] `srt:FuelMember`	10
Crude Oil [Member] `srt:CrudeOilMember`	20
Heating Oil [Member] `srt:HeatingOilMember`	30
Crude Oil and Natural Gas Liquids (NGL) [Member] `srt:CrudeOilAndNGLPerBarrelMember`	40
Natural Gas and Natural Gas Liquids [Member] `srt:NaturalGasPerThousandCubicFeetMember`	50
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items] `srt:ConsolidatedOilAndGasProductionAbstract`	40
Oil and Gas, Production Reserve, Energy `srt:ProductionBarrelsOfOilEquivalents1`	10
Oil and Gas, Average Production Cost Per Unit `srt:ConsolidatedOilAndGasProductionCostsPerUnitOfProduction`	20
Oil and Gas, Average Sale Price `srt:AverageSalesPrices`	30
Oil and Gas, Productive Well [Table Text Block] `srt:ScheduleOfProductiveWellsTextBlock`	100
Oil and Gas, Productive Well [Table] `srt:ProductiveWellsTable`	10
Consolidation Items [Axis] `srt:ConsolidationItemsAxis`	10
Consolidation Items [Domain] `srt:ConsolidationItemsDomain`	10
Reportable Geographical Components [Member] `srt:ReportableGeographicalComponentsMember`	10
Geography Eliminations [Member] `srt:GeographyEliminationsMember`	20
Reportable Legal Entities [Member] `srt:ReportableLegalEntitiesMember`	30
Consolidation, Eliminations [Member] `srt:ConsolidationEliminationsMember`	40
Geographical [Axis] `srt:StatementGeographicalAxis`	20
Geographical [Domain] `srt:SegmentGeographicalDomain`	10
Productive Wells [Line Items] `srt:ProductiveWellsLineItems`	30
Oil, Productive Well, Number of Wells, Gross `srt:ProductiveOilWellsNumberOfWellsGross`	10
Oil, Productive Well, Number of Wells, Net `srt:ProductiveOilWellsNumberOfWellsNet`	20
Gas, Productive Well, Number of Wells, Gross `srt:ProductiveGasWellsNumberOfWellsGross`	30
Gas, Productive Well, Number of Wells, Net `srt:ProductiveGasWellsNumberOfWellsNet`	40
Oil, Productive Well, Number of Wells with Multiple Completions, Gross `srt:ProductiveOilWellsNumberOfWellsWithMultipleCompletionsGross`	50
Oil, Productive Well, Number of Wells with Multiple Completions, Net `srt:ProductiveOilWellsNumberOfWellsWithMultipleCompletionsNet`	60
Alternative Disclosure on Productive Wells `us-gaap:AlternativeDisclosureOnProductiveWells`	20
Oil and Gas, Acreage [Table Text Block] `srt:ScheduleOfGasAndOilAcreageTextBlock`	110
Oil and Gas, Acreage [Table] `srt:GasAndOilAcreageTable`	10
Consolidation Items [Axis] `srt:ConsolidationItemsAxis`	10
Consolidation Items [Domain] `srt:ConsolidationItemsDomain`	10
Reportable Geographical Components [Member] `srt:ReportableGeographicalComponentsMember`	10
Geography Eliminations [Member] `srt:GeographyEliminationsMember`	20
Reportable Legal Entities [Member] `srt:ReportableLegalEntitiesMember`	30
Consolidation, Eliminations [Member] `srt:ConsolidationEliminationsMember`	40
Geographical [Axis] `srt:StatementGeographicalAxis`	20
Geographical [Domain] `srt:SegmentGeographicalDomain`	10
Oil and Gas, Acreage [Line Items] `srt:GasAndOilAcreageLineItems`	30
Oil and Gas, Developed Acreage, Gross `srt:GasAndOilAreaDevelopedGross`	10
Oil and Gas, Developed Acreage, Net `srt:GasAndOilAreaDevelopedNet`	20
Oil and Gas, Undeveloped Acreage, Gross `srt:GasAndOilAreaUndevelopedGross`	30
Oil and Gas, Undeveloped Acreage, Net `srt:GasAndOilAreaUndevelopedNet`	40
Oil and Gas, Undeveloped Acreage, Minimum Remaining Term `srt:MinimumRemainingTermsOfLeasesAndConcessionsOnUndevelopedAcreage1`	20
Oil and Gas, Exploratory Well Drilled [Table Text Block] `srt:ScheduleOfExploratoryWellsDrilledTextBlock`	120
Oil and Gas, Exploratory Well Drilled [Table] `srt:ExploratoryWellsDrilledTable`	10
Consolidation Items [Axis] `srt:ConsolidationItemsAxis`	10
Consolidation Items [Domain] `srt:ConsolidationItemsDomain`	10
Reportable Geographical Components [Member] `srt:ReportableGeographicalComponentsMember`	10
Geography Eliminations [Member] `srt:GeographyEliminationsMember`	20
Reportable Legal Entities [Member] `srt:ReportableLegalEntitiesMember`	30
Consolidation, Eliminations [Member] `srt:ConsolidationEliminationsMember`	40
Geographical [Axis] `srt:StatementGeographicalAxis`	20
Geographical [Domain] `srt:SegmentGeographicalDomain`	10
Oil and Gas, Exploratory Well Drilled [Line Items] `srt:ExploratoryWellsDrilledLineItems`	30
Oil and Gas, Exploratory Well Drilled, Net Productive, Number `srt:ExploratoryWellsDrilledNetProductive`	10
Oil and Gas, Exploratory Well Drilled, Net Nonproductive, Number `srt:ExploratoryWellsDrilledNetNonproductive`	20
Oil and Gas, Development Well Drilled [Table Text Block] `srt:ScheduleOfDevelopmentWellsDrilledTextBlock`	130
Oil and Gas, Development Well Drilled [Table] `srt:DevelopmentWellsDrilledTable`	10
Consolidation Items [Axis] `srt:ConsolidationItemsAxis`	10
Consolidation Items [Domain] `srt:ConsolidationItemsDomain`	10
Reportable Geographical Components [Member] `srt:ReportableGeographicalComponentsMember`	10
Geography Eliminations [Member] `srt:GeographyEliminationsMember`	20
Reportable Legal Entities [Member] `srt:ReportableLegalEntitiesMember`	30
Consolidation, Eliminations [Member] `srt:ConsolidationEliminationsMember`	40
Geographical [Axis] `srt:StatementGeographicalAxis`	20
Geographical [Domain] `srt:SegmentGeographicalDomain`	10
Oil and Gas, Development Well Drilled [Line Items] `srt:DevelopmentWellsDrilledLineItems`	30
Oil and Gas, Development Well Drilled, Net Productive, Number `srt:DevelopmentWellsDrilledNetProductive`	10
Oil and Gas, Development Well Drilled, Net Nonproductive, Number `srt:DevelopmentWellsDrilledNetNonproductive`	20
Oil and Gas, Delivery Commitment [Table Text Block] `srt:OilAndGasDeliveryCommitmentsAndContractsDisclosureTextBlock`	140
Oil and Gas, Delivery Commitment [Table] `srt:OilAndGasDeliveryCommitmentsAndContractsTable`	10
Oil and Gas Delivery Commitments and Contracts [Axis] `us-gaap:OilAndGasDeliveryCommitmentsAndContractsAxis`	10
Oil and Gas Delivery Commitments and Contracts, Oil Producing Property [Domain] `us-gaap:OilAndGasDeliveryCommitmentsAndContractsOilProducingPropertyDomain`	10
Oil and Gas, Delivery Commitment [Line Items] `srt:OilAndGasDeliveryCommitmentsAndContractsLineItems`	20
Oil and Gas, Delivery Commitment, Quantity to be Received `srt:OilAndGasDeliveryCommitmentsAndContractsAvailableAmountsToBeReceived`	10
Oil and Gas, Delivery Commitment, Supply Dedicated or Contracted `srt:OilAndGasDeliveryCommitmentsAndContractsSignificantSuppliesDedicatedOrContractedToEntity`	20
Oil and Gas, Delivery Commitment, Quantity Committed `srt:OilAndGasDeliveryCommitmentsAndContractsRemainingContractualVolume`	30
Oil and Gas Delivery Commitments and Contracts, Daily Production `us-gaap:OilAndGasDeliveryCommitmentsAndContractsDailyProduction`	40
Oil and Gas Delivery Commitments and Contracts, Term `us-gaap:OilAndGasDeliveryCommitmentsAndContractsTerm`	50
Oil and Gas Delivery Commitments and Contracts, Fixed Price `us-gaap:OilAndGasDeliveryCommitmentsAndContractsFixedPrice`	60
Unproved Properties Disclosure [Table Text Block] `us-gaap:UnprovedPropertiesDisclosureTextBlock`	150
Suspended Well Costs Disclosure [Text Block] `us-gaap:SuspendedWellCostsDisclosureTextBlock`	160
Capitalized Exploratory Well Costs, Roll Forward [Table Text Block] `us-gaap:CapitalizedExploratoryWellCostsRollForwardTableTextBlock`	10
Increase (Decrease) in Capitalized Exploratory Well Costs that are Pending Determination of Proved Reserves [Roll Forward] `us-gaap:IncreaseDecreaseInCapitalizedExploratoryWellCostsThatArePendingDeterminationOfProvedReservesRollForward`	10
Capitalized Exploratory Well Costs `us-gaap:CapitalizedExploratoryWellCosts`	10
Capitalized Exploratory Well Cost, Additions Pending Determination of Proved Reserves `us-gaap:CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves`	20
Reclassification to Well, Facilities, and Equipment Based on Determination of Proved Reserves `us-gaap:ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves`	30
Capitalized Exploratory Well Cost, Charged to Expense `us-gaap:CapitalizedExploratoryWellCostChargedToExpense1`	40
Capitalized Exploratory Well Cost, Period Increase (Decrease) `us-gaap:CapitalizedExploratoryWellCostPeriodIncreaseDecrease`	50
Schedule of Aging of Capitalized Exploratory Well Costs [Table Text Block] `us-gaap:ScheduleOfAgingOfCapitalizedExploratoryWellCostsTextBlock`	20
Schedule of Projects with Exploratory Well Costs Capitalized for More than One Year [Table Text Block] `us-gaap:ScheduleOfProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearTextBlock`	10
Projects with Exploratory Well Costs Capitalized for More than One Year [Table] `us-gaap:ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearTable`	10
Project [Axis] `us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis`	10
Project [Domain] `us-gaap:ProjectMember`	10
Support Equipment and Facilities [Member] `us-gaap:SupportEquipmentAndFacilitiesMember`	10
Uncompleted Wells Equipment and Facilities [Member] `us-gaap:UncompletedWellsEquipmentAndFacilitiesMember`	20
Aging of Capitalized Exploratory Well Costs [Axis] `us-gaap:AgingOfCapitalizedExploratoryWellCostsAxis`	20
Aging of Capitalized Exploratory Well Costs, Period Range [Domain] `us-gaap:AgingOfCapitalizedExploratoryWellCostsPeriodRangeDomain`	10
Aging of Capitalized Exploratory Well Costs, Period One [Member] `us-gaap:AgingOfCapitalizedExploratoryWellCostsPeriodOneMember`	10
Aging of Capitalized Exploratory Well Costs, Period Two [Member] `us-gaap:AgingOfCapitalizedExploratoryWellCostsPeriodTwoMember`	20
Aging of Capitalized Exploratory Well Costs, Period Three [Member] `us-gaap:AgingOfCapitalizedExploratoryWellCostsPeriodThreeMember`	30
Aging of Capitalized Exploratory Well Costs, Period Four [Member] `us-gaap:AgingOfCapitalizedExploratoryWellCostsPeriodFourMember`	40
Aging of Capitalized Exploratory Well Costs, Period Five [Member] `us-gaap:AgingOfCapitalizedExploratoryWellCostsPeriodFiveMember`	50
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items] `us-gaap:ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearLineItems`	30
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year `us-gaap:CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear`	10
Projects that have Exploratory Well Costs that have been Capitalized for Period Greater than One Year, Number of Projects `us-gaap:ProjectsThatHaveExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear`	20
Aging of Capitalized Exploratory Well Costs, Period Start Date `us-gaap:AgingOfCapitalizedExploratoryWellCostsPeriodStartDate`	30
Aging of Capitalized Exploratory Well Costs, Period End Date `us-gaap:AgingOfCapitalizedExploratoryWellCostsPeriodEndDate`	40
Project with Exploratory Well Costs Capitalized for More than One Year, Activities to Evaluate Reserves `us-gaap:ProjectWithExploratoryWellCostsCapitalizedForMoreThanOneYearActivitiesToEvaluateReserves`	50
Project with Exploratory Well Costs Capitalized for More than One Year, Remaining Activities Required to Prove Reserves `us-gaap:ProjectWithExploratoryWellCostsCapitalizedForMoreThanOneYearRemainingActivitiesRequiredToProveReserves`	60
Capitalized Exploratory Well Costs [Abstract] `us-gaap:CapitalizedExploratoryWellCostsAbstract`	20
Capitalized Exploratory Well Costs that Have Been Capitalized for Period of One Year or Less `us-gaap:CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodOfOneYearOrLess`	10
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year `us-gaap:CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear`	20
Capitalized Exploratory Well Costs `us-gaap:CapitalizedExploratoryWellCosts`	30
Capitalized Exploratory Well Costs, Interim Significant Change `us-gaap:CapitalizedExploratoryWellCostsInterimSignificantChange`	30
Reserves Reported to Other Agencies [Table Text Block] `us-gaap:ReservesReportedToOtherAgenciesTextBlock`	170
Statement that No Reserve Estimates Were Filed with Another Federal Authority or Agency `us-gaap:StatementThatNoReserveEstimatesWereFiledWithAnotherFederalAuthorityOrAgency`	10
Reserve Estimates that Exceed 5 Percent Difference [Abstract] `us-gaap:ReserveEstimatesThatExceedFivePercentDifferenceAbstract`	20
Reserve Estimates Filed with Another Federal Authority or Agency `us-gaap:ReserveEstimatesFiledWithAnotherFederalAuthorityOrAgency`	10
Name of Federal Authority or Agency `us-gaap:NameOfFederalAuthorityOrAgency`	20
Explanation of Reasons for Differences in Reserve Estimates `us-gaap:ExplanationOfReasonsForDifferencesInReserveEstimates`	30
Statement that Reserve Estimates Filed with Another Federal Authority or Agency Do Not Exceed 5 Percent Difference `us-gaap:StatementThatReserveEstimatesFiledWithAnotherFederalAuthorityOrAgencyDoNotExceedFivePercentDifference`	30
Oil and Gas, Present Activity [Table Text Block] `srt:ScheduleOfOilAndGasInProcessActivitiesTextBlock`	180
Oil and Gas, Present Activity [Table] `srt:OilAndGasInProcessActivitiesTable`	10
Consolidation Items [Axis] `srt:ConsolidationItemsAxis`	10
Consolidation Items [Domain] `srt:ConsolidationItemsDomain`	10
Reportable Geographical Components [Member] `srt:ReportableGeographicalComponentsMember`	10
Geography Eliminations [Member] `srt:GeographyEliminationsMember`	20
Reportable Legal Entities [Member] `srt:ReportableLegalEntitiesMember`	30
Consolidation, Eliminations [Member] `srt:ConsolidationEliminationsMember`	40
Geographical [Axis] `srt:StatementGeographicalAxis`	20
Geographical [Domain] `srt:SegmentGeographicalDomain`	10
Oil and Gas, Present Activity [Line Items] `srt:OilAndGasInProcessActivitiesLineItems`	30
Oil and Gas, Present Activity, Well in Process of Drilling `srt:WellsInProcessOfDrilling`	10
Oil and Gas, Present Activity, Well Temporarily Suspended `srt:WellsTemporarilySuspended`	20
Gas Balancing Arrangements [Abstract] `us-gaap:GasBalancingArrangementsAbstract`	190
Gas Balancing, Policy [Policy Text Block] `us-gaap:GasBalancingPolicyPolicyTextBlock`	10
Gas Balancing Volume Amount `us-gaap:GasImbalanceVolumeAmount`	20
Gas Balancing Asset (Liability) `us-gaap:GasImbalanceAssetLiability`	30
Other Costs and Disclosures [Abstract] `us-gaap:OtherCostsAndDisclosuresAbstract`	200
Costs Incurred, Asset Retirement Obligation Incurred `us-gaap:CostsIncurredAssetRetirementObligationIncurred`	10
Results of Operations, Depreciation, Depletion, Amortization and Accretion `us-gaap:ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion`	20
Oil and Gas, Disaggregation of Equity Method Investments, Description `us-gaap:OilAndGasDisaggregationOfEquityMethodInvestmentsDescription`	210