<DefinitionAndReference>
  <Element Id="us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CashPaidForCapitalizedInterest">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlanNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostBeforeTax">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AmountUsedToAcquireMembershipInterestUnitsInWhollyOwnedSubisidiary">
    <definition>Amount used to acquire membership interest units in wholly owned subisidiary.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_UnrecognizedTaxBenefits">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OperatingExpenses">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RefundForFuelCostRecovery">
    <definition>Refund for fuel cost recovery.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AvailableForSaleSecuritiesGrossRealizedGains">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_CommitmentAmountPercentageOfFacilityFeeMaximum">
    <definition>Commitment amount percentage of facility fee maximum.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PreferredEquityDisclosureTextBlock">
    <definition>Preferred Equity Disclosure.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_NetCashProvidedByUsedInInvestingActivities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_SaleLeasebackTransactionGrossProceeds">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_SegmentReportingInformationInvestmentInEquityMethodInvestees">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_TotalRecoverableCosts">
    <definition>Total recoverable costs.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ProceedsFromDividendsReceived">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_NetRefundToRetailCustomers">
    <definition>Net refund to retail customers.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_MinimumLeasePaymentsSaleLeasebackTransactionsWithinTwoYears">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_UnrecoverableStormCostChargedToEarning">
    <definition>Unrecoverable storm cost charged to earning.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OperatingLossCarryforwards">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AvailableForSaleSecuritiesDebtMaturitiesAfterTenToFifteenYearsFairValue">
    <definition>Available for sale securities debt maturities after ten to fifteen years fair value.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AmortizationOfInvestmentTaxCredits">
    <definition>Amortization of investment tax credits.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherLiabilitiesNoncurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_CarryingCostsIncludingInStormCostRecoveryBonds">
    <definition>Carrying costs including in storm cost recovery bonds.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ValuationAllowancesAndReservesBalance">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanTargetAllocationPercentageOfAssetsOther">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherReceivables">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AssetRetirementObligationsNoncurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AdjustmentsToRetainedEarningsNetOfTax">
    <definition>Adjustments to retained earnings, net of tax.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_UnrealizedGainLossOnCashFlowHedgingInstruments">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_LocationOfCcgtElectricPowerPlant">
    <definition>Location of CCGT electric power plant.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_CreditRatesAgreedBySubsidiaryForEachYearUnderSettlementRelatedToTaxBenefitsFromTaxTreatmentOfPurchasedPowerAgreement">
    <definition>Credit rates agreed by subsidiary for each year under settlement related to tax benefits from the tax treatment of Purchased Power Agreement.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_TotalVolumeOfNaturalGasSwapsOutstanding">
    <definition>Total volume of natural gas swaps outstanding.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_RetainedEarningsAppropriated">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_OtherRegulatoryAssets">
    <definition>Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer and are not specifically broken out elsewhere in the balance sheet.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ScheduleOfPublicUtilityPropertyPlantAndEquipmentTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_MinimumLeasePaymentsSaleLeasebackTransactionsWithinFourYears">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRestructuringCharges">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostTextBlock">
    <definition>Defined benefit plan, weighted average assumptions used in calculating net periodic benefit cost.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_BusinessAcquisitionCostOfAcquiredEntityCashPaid">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RevenuesAndFuelCostsPolcyTextBlock">
    <definition>Revenues and fuel costs.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PrescriptionDrugSubsidyReceiptsFiveFiscalYearsThereafter">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LossContingencyPendingClaimsNumber">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PreferredEquityAuthorized">
    <definition>Preferred Equity Authorized.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DefinedBenefitPlanContributionsByEmployerPercentage">
    <definition>Defined benefit plan contributions by employer percentage.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CompensationRelatedCostsPolicyTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_IncreaseInBaseRatesForElectricityUsageFromSpecifiedPeriod">
    <definition>Increase In Base Rates For Electricity Usage From Specified Period.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_TreasuryStockShares">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ImpairmentOrDisposalOfLongLivedAssetsPolicyTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_MaximumLengthOfTimeOverWhichCompanyIsCurrentlyHedgingVariabilityInFutureCashFlowsForForecastedPowerTransactions">
    <definition>Maximum length of time over which Company is currently hedging the variability in future cash flows with derivatives for forecasted power transactions.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherComprehensiveIncomeAvailableForSaleSecuritiesTax">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PropertyInsuranceInsuredAmountPerOccurrence">
    <definition>Property Insurance insured amount per occurrence.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AdditionalLiabilityRelatedWithPurchaseAgreement">
    <definition>Additional liability related with the purchase agreement.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_NumberOfAnnualInstallmentsOfNotesCommencingEightYearsFromDateOfClosing">
    <definition>Number Of Annual Installments Of Notes Commencing Eight Years From The Date Of Closing.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PreferredUnitsRedemptionPrice">
    <definition>preferred units Redemption price.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_JointlyOwnedUtilityPlantFuelType">
    <definition>Jointly owned utility plant fuel type.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_FairValueAssetsMeasuredOnRecurringBasisTotal">
    <definition>Fair Value, Assets Measured on Recurring Basis total.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_StockIssuedDuringPeriodValueNewIssues">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LongTermNotesPayable">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AllowanceForFundsUsedDuringConstructionInvestingActivities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AssetRetirementObligationDisclosureTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DebtInstrumentInterestRateStatedPercentage">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ProceedsFromDecommissioningFund">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PercentageOfAfterTaxNetProfitToBeRetainByExecutiveOfficerToAchiveOwnershipPosition">
    <definition>Percentage Of After Tax Net Profit To Be Retain By The Executive Officer To Achive Ownership Position.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_IssuanceOfCommercialPaperToFinanceAcquisitionAndOwnershipOfNuclearFuelTextBlock">
    <definition>Issuance Of Commercial Paper To Finance Acquisition And Ownership Of Nuclear Fuel.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ProfitLoss">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedContributionPlanCostRecognized">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_JointlyOwnedUtilityPlantCapability">
    <definition>Jointly Owned Utility Plant Capability.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AdditionalRateIncreasePursuantToSpecialRateImplementation">
    <definition>Additional rate increase pursuant to a special rate implementation.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ProceedsFromSaleLeasebackOfNuclearFuel">
    <definition>The net cash inflow from any material that is commonly used in the generation of nuclear energy.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ConstructionPayableCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNuclearFuelUnderCapitalLease">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_EstimateOfPaymentsOrReceiptsAmongUtilityOperatingCompaniesTextBlock">
    <definition>Estimate of payments or receipts among utility operating companies.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AuthorizedShortTermBorrowings">
    <definition>Authorized short-term borrowings.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_FairValuesPolicyTextBlock">
    <definition>Fair values.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PropertyPlantAndEquipmentPolicyTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PreferredEquityOutstanding">
    <definition>Preferred Equity Outstanding.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_RepaymentsOfFirstMortgageBond">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_StockIssuedDuringPeriodNewIssuesStatedAmountPerStock">
    <definition>stock issued during period new issues stated amount per stock.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_StockIssuedDuringPeriodSharesDirectorsPlan">
    <definition>Stock issued during period shares directors plan.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_NetWorthRequiredUnderTermsOfMembershipInterest">
    <definition>Net worth required under terms of membership interest.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_StockIssued">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RefundToCustomersPerSettlement">
    <definition>Refund To Customers Per Settlement.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanBenefitObligation">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_CommonStockAndTreasuryStockSharesActivityTextBlock">
    <definition>Common Stock And Treasury Stock Shares Activity.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DepreciationNonproduction">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LaborAndRelatedExpense">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ProceedsFromIssuanceOrSaleOfEquity">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ElectricUtilityRevenue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLegalSettlements">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_IncreaseInDecommissioningLiability">
    <definition>Increase in Decommissioning Liability.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DefinedBenefitPlanChangeInBenefitObligationPlanAssetsFundedStatusAmountsRecognizedInBalanceSheetsTextBlock">
    <definition>Defined benefit plan change in benefit obligation plan assets funded status amounts recognized in balance sheets.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CapitalLeaseObligationsNoncurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DerivativeInstrumentsDesignatedAsCashFlowHedgesOnConsolidatedStatementsOfIncomeTextBlock">
    <definition>Derivative instruments designated as cash flow hedges on consolidated statements of income text block.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DeferredFuelCosts">
    <definition>Carrying amount as of the balance sheet date of capitalized fuel costs of a regulated entity that are not expected to be recovered from customers within one year.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncomeLossFromEquityMethodInvestments">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PercentageInPowerPlantOwnedByVie">
    <definition>Percentage of the VIE's voting interest owned by the registrant. In general, a VIE is a corporation, partnership, trust, or any other legal structure used for business purposes that either (a) does not have equity investors with voting rights or (b) has equity investors that do not provide sufficient financial resources for the entity to support its activities. A VIE often holds financial assets, including loans or receivables, real estate or other property. A VIE may be essentially passive or it may engage in research and development or other activities on behalf of another company.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsDividendPaymentPerShare">
    <definition>Share based compensation arrangement by share based payment award fair value assumptions dividend payment per share.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_NetTaxBenefitOnSalesOfPreferredShares">
    <definition>Net Tax Benefit On Sales Of Preferred Shares.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_TotalIncomeTaxesTextBlock">
    <definition>Total income taxes.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_CapacityThreeTrainGasFiredCombinedCycleGeneratingTurbineMegaWatt">
    <definition>Capacity three-train gas-fired combined cycle generating turbine ,in  MW.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_TotalTaxIncludedInNoticesOfDeficiency">
    <definition>Total tax included in IRS notices of deficiency.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AdditionalDamageCoverageForTerroristEvent">
    <definition>Additional damage coverage for a terrorist event.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredTaxAssetsDeferredIncome">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CurrentStateAndLocalTaxExpenseBenefit">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDistribution">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AuthorizedReturnOnCommonEquityMaximum">
    <definition>Maximum authorized return on common equity.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_CostOfServiceAdjustment">
    <definition>Cost of service adjustment.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_IncreaseInElectricBaseRatePercentageAsPerSettlement">
    <definition>Increase in electric base rate, percentage as per settlement.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AssetRetirementObligation">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_SegmentReportingInformationDebtFinancingCostsWriteOff">
    <definition>Segment Reporting Information Debt financing costs write off.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PaymentsForProceedsFromOtherInvestingActivities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LeaseAndRentalExpense">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AssetRetirementObligationRevisionOfEstimate">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RiverBendAnnualDecommissioningCostsPerSettlement">
    <definition>River Bend annual Decommissioning costs per settlement.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PreferredUnitsOutstanding">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="dei_EntityWellKnownSeasonedIssuer">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PropertyInsuranceDeductiblesForDamageFromWindstorm">
    <definition>Property Insurance Deductibles for Damage from a windstorm.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_OwnershipPercentageByNonAffiliatedCompanyInVariableInterestEntity">
    <definition>Ownership percentage by a non affiliated company in Variable interest entity.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DeferredFuelCostNoncurrent">
    <definition>Deferred fuel cost noncurrent.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_SharesIssued">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_LiquidationPricePerUnit">
    <definition>Liquidation price per unit.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PublicUtilitiesPropertyPlantAndEquipmentOther">
    <definition>Public Utilities Property Plant And Equipment Other.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AuthorizedReturnOnCommonEquityMinimum">
    <definition>Minimum authorized return on common equity.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ProspectiveAnnualRateReductionsForFiveYears">
    <definition>Prospective Annual rate reductions for five years.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_SignificantComponentsOfAccumulatedDeferredIncomeTaxesAndTaxesAccruedTextBlock">
    <definition>Significant components of accumulated deferred income taxes and taxes accrued.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_MinorityInterest">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_SegmentReportingInformationCapitalCostsWriteOff">
    <definition>Segment Reporting Information Capital costs write off.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DeferralAsRegulatoryAssetOfLegalExpenses">
    <definition>Deferral as regulatory asset of legal expenses.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_EarningsPerShareDiluted">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_NuclearFuelNetOfAmortization">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ReceiptsBasedOnPreviousYearProductionCosts">
    <definition>Receipts based on previous year production costs.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ShareOfRiverBend">
    <definition>Share of River Bend.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RefundToCustomersIncludingInterest">
    <definition>Refund to customers including interest.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_SaleLeasebackTransactionImputedInterestRate">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanBenefitsPaid">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ConsolidatedDebtRatio">
    <definition>Consolidated debt ratio.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_LimitAboveWhichIncrementalRevenueSharedBetweenRatepayersAndShareholders">
    <definition>Limit above which incremental revenue shared between ratepayers and shareholders.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncomeTaxPolicyTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredTaxAssetsNet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanTargetAllocationPercentageOfAssetsEquitySecuritiesRangeMaximum">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AverageCouponRateOfDebtSecuritiesPercentage">
    <definition>Average Coupon Rate Of Debt Securities Percentage.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_MaximumRetrospectiveInsurancePremiumObligationExcludingSurchargePerReactorPerIncident">
    <definition>Maximum retrospective insurance premium obligation excluding surcharge per reactor per incident.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AvailableForSaleSecurities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_CapitalLossCarryforwardsExpirationDates">
    <definition>Capital loss carryforwards expiration dates.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_SettlementChargeRelatedToPaymentOfLumpSumBenefitsOutOfPlan">
    <definition>Settlement charge related to the payment of lump sum benefits out of the non-qualified pension plans.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredTaxLiabilities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LongTermDebtTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_SharebasedCompensationArrangementByShareBasedPaymentAwardCompensationPaid">
    <definition>Share-based Compensation Arrangement by Share-based Payment Award, Compensation Paid.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_RatioOfIndebtednessToNetCapital">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_CashFlowHedgesMoneyContracts">
    <definition>Cash flow hedges money contracts.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredTaxLiabilitiesNoncurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DebtInstrumentMaturityDateDescription">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AdditionalAllocationForDecisionRecommendation">
    <definition>Additional allocation for decision recommendation.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_Cash">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AmortizationPeriodOfCost">
    <definition>Amortization period of cost.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ScheduleOfSeniorSecuredTransitionBondsTextBlock">
    <definition>Schedule of senior secured Transition Bonds.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_LeaseholdInterestIncludedInJointlyOwnedUtilityPlantProportionateOwnershipShare">
    <definition>Leasehold interest held by System Energy.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanAmortizationOfNetGainsLosses">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PreferredEquity">
    <definition>Preferred Equity.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CommonStockParOrStatedValuePerShare">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_CarryingCostsOnIssuanceOfBondsToRecoverStormDamageRestorationCosts">
    <definition>Carrying costs on issuance of bonds to recover storm damage, restoration costs.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AccumulatedOtherComprehensiveIncomeLossNoteTextBlock">
    <definition>Accumulated Other Comprehensive Income (Loss).</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_SaleOfClassBPreferredShares">
    <definition>Sale Of Class B Preferred Shares.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CommonStockSharesAuthorized">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DerivativeLiabilityDesignatedAsHedgingInstrumentFairValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_NetReductionForDecreasedCapacityCostsAndBaseRateReclassification">
    <definition>Net Reduction For Decreased Capacity Costs And Base Rate Reclassification.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ReturnOnCommonEquityOnGasStabilizationPlan">
    <definition>Return on common equity on gas stabilization plan.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncomeTaxReconciliationOtherReconcilingItems">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxEffectPeriodIncreaseDecrease">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AmortizationOfRateCaseCosts">
    <definition>Amortization of rate case costs.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_SummaryOfTaxCreditCarryforwardsTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ConsolidatedDebtRatioOfCapitalization">
    <definition>Consolidated debt ratio of capitalization.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CashAndCashEquivalentsPolicyTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_TreasuryStockValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanYearThatRateReachesUltimateTrendRate">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PlannedGenerationFromNonNuclearPowerPlantsSoldForwardUnderFinancialDerivatives">
    <definition>Planned Generation From Non Nuclear Power Plants Sold Forward Under Financial Hedges</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PlannedGenerationSoldForwardFromNonUtilityNuclearPowerPlants">
    <definition>Planned Generation Sold Forward From Wholesale Commodities.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_IncreaseInIncrementalCapacityCosts">
    <definition>Increase in Incremental Capacity costs.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_EstimatedReceiptsBasedOnProductionCosts">
    <definition>Estimated receipts based on production costs.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_FuturePaymentToNypaForPowerSoldFromIndianPointThreePlantPerMwh">
    <definition>Future Payment to NYPA for power sold from Indian point 3 plant, per MWh.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CurrentIncomeTaxExpenseBenefit">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ExpectedCurrentYearPostretirementContributions">
    <definition>Expected current year postretirement contributions.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_StipulationAgreementNotToRecoverStormRestorationSpending">
    <definition>Unrecoverable storm restoration spending per stipulation agreement.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ReductionInOtherPostretirementBenefitCost">
    <definition>Reduction in other postretirement benefit cost.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncreaseDecreaseInReceivables">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RefundReducedOfUnderRecoveredIncrementalPurchasedCapacityCosts">
    <definition>Refund reduced of under recovered incremental purchased capacity costs.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DerivativeAssetNotDesignatedAsHedgingInstrumentOffset">
    <definition>Derivative asset not designated as hedging instrument offset.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_Goodwill">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncreaseDecreaseInAccountsPayable">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_UpFrontFinancingCostsIncludingInStormCostRecoveryBonds">
    <definition>Up-front financing costs including in storm cost recovery bonds.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_NumberOfAnnualInstallmentsOfNotesCommencingOneYearFromDateOfClosing">
    <definition>Number of annual installments of notes commencing one year from the date of the closing.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_SegmentReportingInformationLineOfCreditFacility">
    <definition>Segment reporting information, line of credit facility.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredTaxAssetsOperatingLossCarryforwards">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPeriodExpectedForVesting">
    <definition>Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Period Expected for Vesting.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_EarningsPerSharePolicyTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_CashPaymentForUnitThreeAndOneThirdInterestInAcquiree">
    <definition>cash payment  for Unit 3 and a one-third interest in acquiree.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_SegmentReportingInformationRevenueFromExternalCustomers">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_RegulatoryAssets">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_FairValueOfLongTermDebtExcludingCapitalLeaseLongTermDepartmentOfEnergyAndNotesPayableToNewYorkPowerAuthority">
    <definition>Fair value of longterm debt excluding capitallease,longterm Department of Energy and notes payable to New York Power Authority.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_NumberOfCriteriaSpecifiedInAccountingStandardsWhichShouldBeMetByRateRegulatedEnterprises">
    <definition>Number of criteria specified in accounting standards which should be met by rate regulated enterprises.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PropertyInsuranceExcessLayerInExcessOfPrimaryLayer">
    <definition>Property insurance excess  layer in  excess of primary layer.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AdditionalPaidInCapital">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ShareBasedCompensationArrangementByShareBasedPaymentAwardInMoneyStockOptionsIntrinsicValue">
    <definition>Share based compensation arrangement by share based payment award in the money stock options intrinsic value.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_EarningsPerAverageCommonShareTextBlock">
    <definition>Earnings per average common share.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_WeightedAverageInterestRate">
    <definition>Weighted average interest rate.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PrepaidTaxes">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_SegmentReportingInformationDepreciationDepletionAndAmortizationExpense">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearFour">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanAmortizationOfTransitionObligationsAssets">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ChangesInTransitionChargeAccount">
    <definition>Changes in the account in which recoveries from customers through a transition charge are deposited and and from which payments are made to service the securitization bonds issued by Entergy Gulf States Reconstruction Funding.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_RegulatoryLiabilityNoncurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_EquityMethodInvestmentSoldCarryingAmount">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncreaseDecreaseInRegulatoryAssetsAndLiabilities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredTaxAssetsNetNoncurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_CommitmentAmountPercentageOfFacilityFeeMinimum">
    <definition>Commitment amount percentage of facility fee minimum.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_TaxCreditCarryforwardAmount">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_UseOfEstimatesPolicyTextBlock">
    <definition>Use of estimates.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_MandatoryEmployeeContributionUnderRetirementPlan">
    <definition>Mandatory employee contribution under Retirement Plan.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_QuarterlyOperatingResultsTextBlock">
    <definition>Quarterly operating results.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_FairValueAssetsMeasuredOnRecurringBasisTemporaryCashInvestments">
    <definition>Fair Value, Assets Measured on Recurring Basis Temporary cash investments.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DebtInstrumentMaturityDate">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AmountRelatedToRealignmentToAndRecoveryThroughBaseRatesOfCertainFuelCosts">
    <definition>Amount related to a realignment to and recovery through base rates of certain fuel costs.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RateOfMaximumRetrospectivePremiumPerYearPerNuclearPowerReactor">
    <definition>Rate of maximum retrospective premium per year per nuclear power reactor.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ActuariallyDeterminedAccumulatedPostretirementBenefitObligationEarnedByRetireesAndActiveEmployees">
    <definition>The amount of the 12/31/1992 accumulated postretirement benefit obligation at the adoption of SFAS 106. It is being amortized over 20 years.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherLiabilitiesCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_JointlyOwnedGeneratingStationsPolicyTextBlock">
    <definition>Jointly owned generating stations.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_StormRelatedCosts">
    <definition>New Orleans Storm related costs eligible for CDBG funding.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DepreciationRatesOnAverageDepreciableUtilityProperty">
    <definition>Depreciation rates on average depreciable utility property.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_TaxLawChange">
    <definition>Tax law change.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeNet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PrescriptionDrugSubsidyReceiptsYearTwo">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_TaxReserves">
    <definition>Tax reserves.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OperatingLossCarryforwardsValuationAllowance">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ReductionInAnnualBaseRate">
    <definition>Reduction in annual base rate.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncreaseDecreaseInFuelInventories">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanBeforeAdoptionOfSFAS158RecognitionProvisionsNetPriorServiceCostsCreditsNotYetRecognized">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_CapacityOfSimpleCycleGasFiredPowerPlantMeggaWatt">
    <definition>Capacity Of Simple Cycle Gas Fired Power Plant Megga Watt.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredIncomeTaxExpenseBenefit">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PresentValueOfFutureMinimumLeasePaymentsSaleLeasebackTransactions">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_StockIssuedDuringPeriodNewIssuesDescription">
    <definition>Stock issued during period new issues description.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_CashFlowHedgesOutOfMoneyContracts">
    <definition>Cash flow hedges out-of-the-money contracts.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_StockholdersEquity">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AuthorizedReturnOnEquityPerSettlement">
    <definition>Authorized Return on equity per settlement.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CompetitiveEnergyRevenue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="dei_DocumentPeriodEndDate">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AmountTransferdToSubsidiary">
    <definition>Amount transferd to subsidiary.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanBeforeAdoptionOfSFAS158RecognitionProvisionsAmountsRecognizedInBalanceSheet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AdditionalIncreaseInBaseRatesForBillsRenderedFromSpecifiedPeriod">
    <definition>Additional Increase In Base Rate For Bills Rendered From the Specified Period.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CapitalLeasedAssetsGross">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AccountsPayableCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LiabilitiesAndStockholdersEquity">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AmountAuthorizedForStormReserve">
    <definition>Amount authorized for storm reserve.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_BandwidthPaymentToBeReceived">
    <definition>Bandwidth payment to be received.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_EquityMethodInvestments">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PropertyPlantAndEquipmentNet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CustomerDepositsCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_TaxesExcludingIncomeAndExciseTaxes">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AmountTransferToRestrictedEscrowAccountAsStormDamageReserveByCorporation">
    <definition>Amount transfer to restricted escrow account as Storm damage reserve by corporation.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostBeforeTax">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_UnamortizedTransitionAssetPriorServiceCostAndNetLossRecognizedInRegulatoryAssets">
    <definition>Unamortized transition asset, Prior service cost and Net loss recognized in regulatory assets.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_LongTermNotesPayableTextBlock">
    <definition>Long Term Notes Payable.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AvailableForSaleSecuritiesTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PaymentsMadeUnderPurchasedPowerAgreement">
    <definition>Payments made under Purchased Power Agreement.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ClassPreferredNonVotingMembershipInterestUnitsAcquiredInWhollyOwnedSubisidiary">
    <definition>ClassA Preferred, non-voting, membership interest units acquired in wholly owned subisidiary.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_EarningsPerShareTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_MinimumRateOfEquityCapital">
    <definition>Minimum rate of equity capital.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherLongTermInvestments">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DebtInstrumentInterestRateDuringPeriod">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LineOfCreditFacilityAmountOutstanding">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DerivativeAssetDesignatedAsHedgingInstrumentOffset">
    <definition>Derivative asset designated as hedging instrument offset.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_WriteoffOfCapitalizedReorganizationCosts">
    <definition>Writeoff of capitalized reorganization costs.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock">
    <definition>Disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_IncreaseInAccumulatedDeferredIncomeTaxesAndTaxesAccruedAndRegulatoryAssetForIncomeTaxesNetBalances">
    <definition>Increase in accumulated deferred income taxes and taxes accrued and the regulatory asset for income taxes-net balances.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RiverBendAllowanceForFundsUsedDuringConstructionPolicyTextBlock">
    <definition>River bend allowance for funds used during construction.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansTotalRecognizedInNetPeriodicBenefitCostBeforeTax">
    <definition>Other comprehensive income reclassification of defined benefit plans total recognized in net periodic benefit cost before tax.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="dei_AmendmentFlag">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RequestForGasBaseRevenueIncrease">
    <definition>Request for gas base revenue increase.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredTaxAssetsCapitalLossCarryforwards">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PresentValueOfFutureMinimumLeasePaymentsSaleLeasebackTransactionsTextBlock">
    <definition>Present value of future minimum lease payments sale leaseback transactions.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OperatingIncomeLoss">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RatioOfAdjustedNetIncomeToInterestExpenseToBeMaintainedUnderReimbursementAgreement">
    <definition>Ratio of adjusted net income to interest expense to be maintained under Reimbursement Agreement.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_CapitalGainsLosses">
    <definition>Capital gains (losses).</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CurrentFederalTaxExpenseBenefit">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AdjustmentsToRetainedEarningsBeforeTax">
    <definition>Adjustments to retained earnings, before tax.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="dei_EntityCentralIndexKey">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_FuelInventoryAtAverageCost">
    <definition>Fossil fuel inventory held for consumption in the production of energy.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AverageMonthlyPaymentsUnderUnitPowerSalesAgreement">
    <definition>Average monthly payments under Unit Power Sales Agreement.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PaymentMadePriorToMaturityOnNotePayableToNypa">
    <definition>Payment made prior to maturity on the note payable to NYPA.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_InterimRateIncreaseSubjectToRefund">
    <definition>Interim rate increase subject to refund.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredTaxAssetsTaxCreditCarryforwards">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_UtilitiesOperatingExpenseFuelUsed">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AmountRefundedSubjectToAdjustment">
    <definition>Amount refunded subject to adjustment.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_SegmentFinancialInformationTextBlock">
    <definition>Segment Financial Information.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AnnualLongTermDebtMaturitiesForDebtTextBlock">
    <definition>Annual long-term debt maturities for debt .</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanTargetAllocationPercentageOfAssetsDebtSecurities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_BasisPointBandwidth">
    <definition>Earnings bandwidth for LPSC gas rates.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_IncreaseInGasBaseRate">
    <definition>Increase In Gas Base Rate.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_RetainedEarningsAccumulatedDeficit">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OperatingLeasesFutureMinimumPaymentsDue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanFairValueOfPlanAssets">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_CouponRateOfSeniorSecuredTransitionBonds">
    <definition>Coupon rate of senior secured transition bonds.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_FuturePaymentToNypaForPowerSoldFromFitzPatrickPlantPerMwh">
    <definition>Future Payment to NYPA for power sold from FitzPatrick  plant, per Mwh.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_MinimumLeasePaymentsSaleLeasebackTransactionsWithinFiveYears">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherAssetsCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ResultedCreditRateWithInterestByInternalRevenueServiceSettlement">
    <definition>ResultedCreditRateWithInterestByIrsSettlement.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ValuationAllowancesAndReservesChargedToCostAndExpenseAndOtherAccounts">
    <definition>Valuation Allowances And Reserves Charged To Cost And Expense and other accounts.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CommonStockSharesIssued">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_SurchargeOnMaximumRetrospectivePremium">
    <definition>Surcharge on maximum retrospective premium.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_MinimumLeasePaymentsSaleLeasebackTransactionsWithinOneYear">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_Assets">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ScheduleOfRegulatoryAssetsTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PropertyInsurancePrimaryLayerInExcessOfSelfInsuredRetention">
    <definition>Property insurance Primary layer in excess of the self-insured retention.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_EquityMethodInvestmentDividendsOrDistributions">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_EliminationInCurrentPlanSharing">
    <definition>Sharing included in current formula rate plan with MPSC.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredTaxAssetsValuationAllowance">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_VoluntaryEmployeeContributionsContributionUnderRetirementPlan">
    <definition>Voluntary  employee contributions contribution under Retirement Plan.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RecoveryPeriodForProjectCost">
    <definition>Recovery period for the project cost.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CommitmentsAndContingencies2009">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ProceedsFromIssuanceOfLongTermDebt">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_MoneyBorrowedBySubsidiaryFromParentThroughNotePayableUnderRevolvingCreditFacility">
    <definition>Money Borrowed By Subsidiary From Parent Through Note Payable Under Revolving Credit Facility.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PublicUtilitiesPropertyPlantAndEquipmentNuclearFuelLeasedAndOwned">
    <definition>Public utilities property plant and equipment nuclear fuel leased and owned.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DefinedBenefitPlanNumberOfQualifiedPensionPlans">
    <definition>Defined benefit plan, number of qualified pension plans.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_NumberOfTransactionsUnderSaleAndLeaseback">
    <definition>Number of transactions under sale and lease back.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AvailableForSaleSecuritiesDebtMaturitiesAfterTwentyYearsFairValue">
    <definition>Available For Sale Securities Debt Maturities After Twenty Years Fair Value.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PriceUnderPpaUpperRangePerMwh">
    <definition>Price under PPA, upper range, per Mwh.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AmountOfDisallowedFuelCostsForSpecifiedPeriodPerSettlement">
    <definition>Amount of disallowed fuel costs For Specified Period per settlement.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_SaleLeasebackTransactionNetBookValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RevenueRequirementToProvideSupplementalFunding">
    <definition>Revenue requirement to provide supplemental funding.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_InvestmentPolicyTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AuthorizationOfRepurchaseOfCommonStock">
    <definition>Authorization of repurchase of common stock.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_CommonEquityTextBlock">
    <definition>Common equity.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_LossContingencyNumberOfClaimantsInvolvedInPendingClaims">
    <definition>Loss contingency number of claimants involved in pending claims.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanTargetAllocationPercentageOfAssetsOtherRangeMaximum">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PrescriptionDrugSubsidyReceiptsYearOne">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherTaxCarryforwardValuationAllowance">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AnnualCapForFuturePaymentToNypaForPowerSoldFromIndianPointThreePlant">
    <definition>Annual Cap for Future Payment to NYPA for power sold from Indian point 3 plant.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_LineOfCreditFacilityCommitmentFeeCommitmentFeePercentageOfCommitmentAmount">
    <definition>Line of credit facility commitment fee, commitment fee percentage of commitment amount.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_TimePeriodOfExpectedRecoveryOfCost">
    <definition>Time period of expected recovery of cost.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredTaxLiabilitiesCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_CashPaidToTaxingAuthorities">
    <definition>Cash paid to taxing authorities.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ExpectedCurrentYearPensionContributions">
    <definition>Expected current year pension contributions.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LongTermTransitionBond">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_SegmentReportingInformationRevenue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DerivativeLiabilityNotDesignatedAsHedgingInstrumentOffset">
    <definition>Derivative liability not designated as hedging instrument offset.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_BaseRateRecoveryAdjustment">
    <definition>Capacity costs to be recovered through Base Rate Recovery.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_TreasuryStockValueAcquiredCostMethod">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_OperatingLeasesFutureMinimumPaymentsInterestIncludedInPayments">
    <definition>Operating leases, future minimum payments, interest included in payments.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ProceedsFromIssuanceOfMortgageBonds">
    <definition>Proceeds from the issuance of mortgage bonds.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearThree">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_MinorityInterestInNetIncomeLossPreferredUnitHolders">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanTargetAllocationPercentageOfAssetsEquitySecurities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PaymentsFromUtilityOperatingCompaniesAsPercentageOfAverageProductionCost">
    <definition>Payments from utility operating companies as percentage of average production cost.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanFundedStatusOfPlan">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DefinedBenefitPlanContributionsByEmployerAsPercentageOfEligibleEarningsPerPayPeriod">
    <definition>Defined benefit plan contributions by employer as percentage of eligible earnings per pay period.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_OperatingAndCapitalLeasesFutureMinimumPaymentsDueTextBlock">
    <definition>Operating and capital leases future minimum payments due.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PriceUnderPpaLowerRangePerMwh">
    <definition>Price under PPA, lower range, per Mwh.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_SignificantAccountingPoliciesTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RepaymentOfMoneyBorrowedThroughNotePayableUnderRevolvingCreditFacilityBySubsidiary">
    <definition>Repayment Of Money Borrowed Through Note Payable Under Revolving Credit Facility By Subsidiary.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AccidentalOutageCoverageProgramWeeklyIndemnity">
    <definition>Accidental outage coverage program weekly indemnity.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_WeightedAverageInterestRateOnBorrowings">
    <definition>Weighted Average Interest Rate on Borrowings.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DecommissioningFundInvestments">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_MinimumPercentageOfAdjustedCapitalizationToBeMaintainedAsTotalEquityCapital">
    <definition>Minimum percentage of adjusted capitalization to be maintained as total equity capital.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AggregateExpensesOfDomesticallySponseredTerroristActs">
    <definition>Aggregate Expenses of domestically sponsered terrorist acts.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredTaxAssetsDeferredGainOnSaleLeasebackTransaction">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_NewFormulaRatePlan">
    <definition>Return on common equity per formula rate plan filings with LPSC.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PropertyInsuranceDeductiblesPerOccurrence">
    <definition>Property Insurance deductibles per occurrence.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncomeTaxesPaidNet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanNetPriorServiceCostCreditRecognizedInNetPeriodicBenefitCostBeforeTax">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_TaxCreditCarryforwardExpirationDates">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CostOfPurchasedPower">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DepreciationRateOnAverageDepreciableProperty">
    <definition>Depreciation rates on average depreciable property.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ScheduleOfLossContingenciesByContingencyTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_CreditFacilityMaximumBorrowingCapacity">
    <definition>Credit facility maximum borrowing capacity.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriod">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_QuarterlyFinancialInformationTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DeferredNuclearRefuelingOutageCosts">
    <definition>Costs deferred during a nuclear refueling outage and amortized over the estimated period to the next outage because these refueling outage expenses are incurred to prepare the units to operate for the next operating cycle without having to be taken off line.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_NetCashProvidedByUsedInOperatingActivities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTax">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LiabilitiesNoncurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ProceedsFromSaleOfRestrictedInvestments">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CurrentForeignTaxExpenseBenefit">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RevenueAdjustmentCap">
    <definition>Revenue adjustment cap.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CommonStockDividendsPerShareDeclared">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PeriodForCreatingStormReserve">
    <definition>Period for creating storm reserve.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanTargetAllocationPercentageOfAssetsDebtSecuritiesRangeMaximum">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DiscontinuedOperationDisposalSalePrice">
    <definition>Discontinued operation disposal sale price.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_InterestExpense">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanGrossPrescriptionDrugSubsidyReceiptsReceived">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AssetRetirementObligationAccretionExpense">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_EffectOfChangeInDefenitionOfUnitOfPropertyToDetermineAppropriateCharacterizationOfCosts">
    <definition>Effect of change in the defenition of Unit of Property to determine the appropriate characterization of costs.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AnnualCapForFuturePaymentToNypaForPowerSoldFromFitzPatrickPlantPerMwh">
    <definition>Annual cap for Future Payment to NYPA for power sold from FitzPatrick plant, per Mwh.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_MaximumRecoveryPeriodOfProjectCostFromCustomers">
    <definition>Maximum recovery period of the project cost from customers.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LossContingencyRangeOfPossibleLoss">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ExpirationPeriodOfSaleAndLeaseBackTransaction">
    <definition>Expiration period of sale and lease back transaction.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedTotalFairValue">
    <definition>Share based Compensation Arrangement by Share Based Payment Award Options Vested  Total Fair Value.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_CapitalStockAndOtherExpenses">
    <definition>Expenses incurred in connection with the issuance and sale of capital stock.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_IncreaseInRevenueRequirementForDecommissioning">
    <definition>Increase in the revenue requirement for decommissioning.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_NaturalGas">
    <definition>Period end amount of property, plant and equipment (PPE) related to transmission and distribution of natural gas for resale owned by public utility.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_MedicareSubsidiesForPrescriptionDrugClaimsReceived">
    <definition>Medicare subsidies for prescription drug claims received.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTax">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_EarnedReturnOnCommonEquity">
    <definition>Earned return on common equity.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_StockIssuedDuringPeriodSharesNewIssues">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_NumberOfEquityOwnershipPlans">
    <definition>Number of equity ownership plans.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_SystemAgreementCostEqualizationAssets">
    <definition>Carrying amount as of the balance sheet date of the System Agreement cost equalization payments that are expected to be recovered through Entergy Arkansas' production cost allocation rider within one year.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_SegmentReportingInformationIncomeTaxExpenseBenefit">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableIntrinsicValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="dei_DocumentType">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DeferredFuelCostsCurrentLiabilities">
    <definition>Carrying amount as of the balance sheet date of capitalized fuel costs of a regulated entity that are expected to be returned to customers through rate adjustments within one year.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DamagesCausedByNonrequirementsSales">
    <definition>Damages caused by the non-requirements sales.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LineOfCreditFacilityExpirationDate">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionTax">
    <definition>Derivative Instruments Gain Loss Reclassified From Accumulated OCI Into Income Effective Portion, Tax.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LongTermDebtCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_RedeemablePreferredStockSharesOutstanding">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_EquityMethodInvestmentDescriptionOfPrincipalActivities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DerivativeAssetDesignatedAsHedgingInstrumentFairValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_NetCarryingValueOfPlant">
    <definition>Net carrying value of plant.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DeferredFuelCostTextBlock">
    <definition>Deferred fuel cost.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_TreasuryStockSharesAcquired">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ChangeInGasBaseRevenue">
    <definition>Change in gas base revenue.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_NuclearRefuelingOutageCostsPolicyTextBlock">
    <definition>Nuclear refueling outage costs.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PaymentsOnLeaseIncludingInterest">
    <definition>Payments on lease,including interest.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherAssetsNoncurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_OtherRegulatoryChargesCreditsNet">
    <definition>Represents the debit or credit to defer certain costs or revenues because they will be recovered or returned to customers in the future.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AverageDilutiveEffectOfEquityUnitsIncome">
    <definition>Average Dilutive Effect Of Equity Units Income.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DeferredTaxLiabilitiesPowerPurchaseAgreements">
    <definition>Deferred Tax Liabilities, Power Purchase Agreements.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PreferredSharesPurchasedBySubsidiaryFromOtherShareholders">
    <definition>Preferred Shares Purchased By Subsidiary From Other Shareholders.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PublicUtilitiesPolicyTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_TotalPremiumForReactorUnderSecondaryFinancialProtectionProgram">
    <definition>TotalPremiumForReactorUnderSecondaryFinancialProtectionProgram.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PreferredUnitsDividendRate">
    <definition>Preferred Units Dividend Rate.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PercentageOfInterestInRiverBendRegulatoryAssets">
    <definition>Percentage of interest in River Bend Regulatory assets.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PrescriptionDrugSubsidyReceiptsYearFive">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_FutureAmortizationExpenseYearFive">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PeriodWithinWhichPreferredSharesToBeSoldBySubsidiary">
    <definition>Period within which the preferred shares to be sold by subsidiary.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_MaximumRetrospectiveInsurancePremiumObligationPerReactorPerIncident">
    <definition>Maximum retrospective insurance premium obligation per reactor per incident.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LineOfCreditFacilityInterestRateDuringPeriod">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_NetIncomeLoss">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_TimeTakenToFileAnalysis">
    <definition>Time taken to file the analysis.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ImplicitInterestRateOfNotes">
    <definition>Implicit interest rate of notes.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_MinimumFixedChargeCoverageRatioToBeMaintained">
    <definition>Minimum fixed charge coverage ratio to be maintained.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ConversionOfVoluntaryRecoveryCreditToPermanentReductionAndSubstantialRealignmentOfCostRecovery">
    <definition>Conversion of voluntary recovery credit to a permanent reduction and substantial realignment of cost recovery.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ValuationAllowancesAndReservesDeductions">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ValueOfLeaseObligation">
    <definition>Value of lease obligation excluded from fair value of long-term debt calculation.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CapitalLeaseObligationsCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetTransitionAssetsObligationsBeforeTax">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AmortizationOfIntangibleAssets">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_IncreaseDecreaseInElectricBaseRevenue">
    <definition>Decrease in electric base revenue.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_FairValueLiabilitiesMeasuredOnRecurringBasis">
    <definition>Fair Value Liabilities Measured On Recurring Basis.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DiscontinuedOperationOwnershipPercentageSold">
    <definition>Discontinued operation ownership percentage sold.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DividendsPreferredStockCash">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsInFiveFiscalYearsThereafter">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_CreditFacilityExpirationDate">
    <definition>Credit facility expiration date.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanEquitySecurities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationTextBlock">
    <definition>Defined benefit plan, weighted average assumptions used in calculating benefit obligation.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RecommendedRecoveryPeriodOfProjectCostFromCustomers">
    <definition>Recommended recovery period of the project cost from customers.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_IncomeTaxExpensesFromContinuingOperationsTextBlock">
    <definition>Income tax expenses from continuing operations.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_JointlyOwnedUtilityPlantNetOwnershipAmount">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_NumberOfNuclearReactorIncludedInSecondaryFinancialProtectionProgram">
    <definition>NumberOfNuclearReactorIncludedInSecondaryFinancialProtectionProgram.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DerivativeLiabilityDesignatedAsHedgingInstrumentOffset">
    <definition>Derivative liability designated as hedging instrument offset.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AccountingChangesAndErrorCorrectionsTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PurchasedPercentageOfCapacityAndEnergyBasedOnAgreement">
    <definition>Purchased percentage of Capacity and Energy based on agreement.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearOne">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AccumulatedDeferredInvestmentTaxCredit">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanInterestCost">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AmountReceivedForCdbgFunds">
    <definition>Amount received for CDBG funds.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AmountOfstormCostRecoveryBondsForTransactionCosts">
    <definition>Amount ofstorm cost recovery bonds for transaction costs.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="dei_EntityCurrentReportingStatus">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_UnrecoverableCostsPreviouslyAccumulatedInStormReserve">
    <definition>Unrecoverable costs previously accumulated in storm reserve.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AmountIncludedInElectricRatesPerYearToFundSmartEnergyEfficiencyProgramsAsPerRateCaseSettlement">
    <definition>Amount included in electric rates per year to fund the smart energy efficiency programs as per rate case settlement.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PortionOfInterestOfRiverBendPlantCostsGenerationRevenuesAndExpensesOperatingLouisianaRetailDeregulatedPortionOfRiverBend">
    <definition>Portion of percentage of interest of River Bend plant costs, generation, revenues and expenses operating the  Louisiana retail deregulated portion of River Bend.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_MinimumAmountOfBenefitsCommittedToPassOnToCustomers">
    <definition>Minimum amount of benefits committed to pass on to the customers.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_UpFrontFinancingCostsOnIssuanceOfBondsToRecoverStormDamageRestorationCosts">
    <definition>Up-front financing costs on issuance of bonds to recover storm damage, restoration costs.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredTaxAssetsLiabilitiesNet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RemainingBalancesOfUnrecognizedTaxBenefits">
    <definition>Remaining balances of unrecognized tax benefits.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LongTermInvestments">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PaymentsOrReceiptsAmongUtilityOperatingCompaniesToAchieveRoughProductionCostEqualizationTextBlock">
    <definition>Payments or receipts among utility operating companies to achieve rough production cost equalization.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_MaturityPeriod">
    <definition>Period after which preferred membership interests are callable.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ExpirationOfStockBasedAwards">
    <definition>Expiration of stock-based awards.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanActuarialNetGainsLosses">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CashEquivalentsAtCarryingValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RequestForElectricBaseRevenueDecrease">
    <definition>Request for electric base revenue decrease.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_RepaymentsOfLongTermDebt">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_GainLossOnInvestments">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_UtilityRevenue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYear">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_InsuranceCoverageForPublicLiability">
    <definition>InsuranceCoverageForPublicLiability.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearFive">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanPlanAmendments">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_EffectiveIncomeTaxRateContinuingOperations">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CommonStockValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RegulatoryDifferencesUtilityPlantItems">
    <definition>Regulatory differences - utility plant items.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LossContingencyRangeOfPossibleLossMaximum">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet">
    <definition>Derivative instruments not designated as hedging instruments gain loss recognized in other comprehensive income effective portion, net.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RequestFiledForRefundOfFuelCostRecoveryOverCollections">
    <definition>Request filed for refund of fuel cost recovery over-collections.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PublicUtilitiesDisclosureTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DerivativesPolicyTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsOnConsolidatedStatementsOfIncomeTextBlock">
    <definition>Derivative instruments not designated as hedging instruments on the consolidated statements of income text block.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_NonControllingInterestsPolicyTextBlock">
    <definition>Non-controlling interests.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_TemporaryEquityCarryingAmount">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ProceedsFromDivestitureOfBusinesses">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredIncomeTaxesAndTaxCredits">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AllocatedShareBasedCompensationExpense">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ReturnOnCommonEquityProvidedBySettlement">
    <definition>Return on common equity provided by settlement.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsContingencies">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShortTermBankLoansAndNotesPayable">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RatioOfDebtToTotalLiabilitiesAndEquityToBeMaintainedUnderReimbursementAgreement">
    <definition>Ratio of debt to totalliabilities and equity to be maintained under Reimbursement Agreement.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AccountsReceivableGrossCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LiabilitiesCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherNoncashExpense">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueTextBlock">
    <definition>Available for sale Securities Continuous Unrealized Loss Position Fair Value text block.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanBeforeAdoptionOfSFAS158RecognitionProvisionsNetTransitionObligationsAssetsNotYetRecognized">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RequiredEnergyForProductionInPercentage">
    <definition>RequiredEnergyForProductionInPercentage.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AvailableForSaleSecuritiesDebtMaturitiesAfterFifteenToTwentyYearsFairValue">
    <definition>Available For Sale Securities Debt Maturities After Fifteen to twenty Years Fair Value.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_NypaValueSharingPayment">
    <definition>Payments made under amended value sharing agreements with NYPA.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_SegmentReportingInformationOtherNoninterestExpense">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_InvestmentIncomeInterestAndDividend">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ScheduleOfDebtInstrumentsTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DefinedBenefitPlanEffectOfOnePercentagePointChangeInAssumedHealthCareCostTrendRatesTextBlock">
    <definition>Defined benefit plan, effect of one percentage point change in assumed health care cost trend rates.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PeriodOfAdditionalLiabilityRelatedWithPurchaseAgreement">
    <definition>Period of additional liability related with the purchase agreement.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PaymentsToInvestInDecommissioningFund">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LeasesOfLesseeDisclosureTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PaymentsForRepurchaseOfCommonStock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ImplicitRateOfFutureMinimumLeasePayments">
    <definition>Implicit rate of future minimum lease payments.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AccruedUnbilledRevenues">
    <definition>Unbilled amounts due for services rendered or products shipped. This element is distinct from unbilled contracts receivables because this is based on noncontract transactions.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DepreciatiopnRatesOnAverageDepreciableNonUtilityProperty">
    <definition>Depreciatiopn rates on average depreciable non utility property.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_MaximumConventionalPropertyInsuranceCoverageOnEachAndEveryLossBasis">
    <definition>Maximum Conventional property insurance Coverage on an each and every loss basis.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_InterestPortionOfMinimumLeasePaymentsSaleLeasebackTransactions">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_NumberOfOperativeNuclearPowerReactorsUnderSubsidiaryCompany">
    <definition>Number of operative nuclear power reactors under subsidiary company.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ConcentrationRiskPercentage">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_FinancingOrderAuthorizedToIssueStormCostRecoveryBonds">
    <definition>Authorized issuance of storm cost recovery bonds by Entergy Arkansas and Entergy Texas.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_NetCashProvidedByUsedInFinancingActivities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PaymentsToAcquireRestrictedInvestments">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DefinedBenefitPlanAssetsTargetAllocationsTextBlock">
    <definition>Defined Benefit Plan Assets Target Allocations.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredTaxLiabilitiesOther">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncreaseDecreaseInDeferredFuelCosts">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_MaximumRateIncreaseBasedOnStaffsTestimony">
    <definition>Maximum rate increase based on Staff's testimony.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PrescriptionDrugBenefitReductionInAccumulatedPostretirementBenefitObligationForSubsidy">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_FlowThroughPermanentDifferences">
    <definition>Flow-through/permanent differences.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="dei_DocumentFiscalYearFocus">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PaymentMadeForIntercompanyObligations">
    <definition>Payment made for intercompany obligations.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShortTermBorrowings">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_UnrecognizedTaxBenefitsNetOfUnusedTaxAttributesAndPayments">
    <definition>Unrecognized tax benefits net of unused tax attributes and payments.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CashAndCashEquivalentsAtCarryingValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_SegmentReportingSegmentAssets">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OperatingLossCarryforwardsExpirationDates">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AssetsNoncurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_UnderFormulaRatePlanOverAndUnderEarningsOutsideAllowedRangeAreAllocatedToSubsidiaryInPercent">
    <definition>Under the formula rate plan ,over and under earnings outside an allowed range are allocated to subsidiary in percent.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="dei_EntityFilerCategory">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_SummaryOfPositionsForWhichSignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DebtInstrumentFaceAmount">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_OperatingLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments">
    <definition>Operating leases, future minimum payments, present value of net minimum payments.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_EquityMethodInvestmentOwnershipPercentage">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AllowanceForFundsUsedDuringConstructionPolicyTextBlock">
    <definition>Allowance for funds used during construction.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ChargeToEarnings">
    <definition>After-tax charge to earnings, including interest, resulting from the PUCT's additional allocation of RPCE to Texas retail customers.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ReplenishmentAmountForStormReserveSpending">
    <definition>Replenishment amount for storm reserve spending.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DepreciationAmortizationAndAccretionNet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_NumberOfYearsForWhichCreditRatesAgreedBySubsidiaryUnderSettlementRelatedToTaxBenefitsFromTaxTreatmentOfPurchasedPowerAgreement">
    <definition>Number of years for which credit rates agreed by subsidiary  under settlement related to tax benefits from the tax treatment of Purchased Power Agreement.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_FutureAmortizationExpenseYearThree">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PresentationOfPreferredStockWithoutSinkingFundPolicyTextBlock">
    <definition>Presentation of preferred stock without sinking fund.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ReturnOnCommonEquity">
    <definition>Return on common equity.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_SegmentReportingInformationIntersegmentRevenue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_NoncurrentIncomeTaxExpenseBenefit">
    <definition>Noncurrent Income Tax Expense Benefit.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AveragePriceUnderPpa">
    <definition>Average price under PPA.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PercentageOfLPSCRegulatedShareOfRiverBend">
    <definition>Percentage of LPSC-regulated share of River Bend.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DefinedBenefitPlanFairValueOfPlanAssetsTextBlock">
    <definition>Fair value of plan assets.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="dei_EntityPublicFloat">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanServiceCost">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DecommissioningTrustFundTextBlock">
    <definition>Describes decommissioning trust assets. May include disclosures such as the purpose of the funds, funding requirements, regulatory authorities and related cost recovery aspects.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PropertyPlantAndEquipmentAdditions">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ApplicableDeductionForInsurancePremium">
    <definition>Applicable deduction for insurance premium.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_MinimumLeasePaymentsSaleLeasebackTransactionsWithinThreeYears">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="dei_CurrentFiscalYearEndDate">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_NuclearFuelPurchases">
    <definition>The net cash outflow from any material that is commonly used in the generation of nuclear energy.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AdjustmentToDeferredFuelCost">
    <definition>Adjustment to deferred fuel cost.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DisallowanceCostsRecommended">
    <definition>Disallowance costs recommended.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_EquityMethodInvestmentsReconciliationTextBlock">
    <definition>Equity Method Investments Reconciliation.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ProvisionForOtherLosses">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AverageDurationOfDebtSecuritiesInYears">
    <definition>Average duration of debt securities.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredTaxAssetsNetCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanTargetAllocationPercentageOfAssetsDebtSecuritiesRangeMinimum">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AverageDilutiveEffectOfStockOptionsPerShare">
    <definition>Average Dilutive Effect Of Stock Options Per Share.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_CurrentRateChangeLimitOfRevenues">
    <definition>Current Rate Change Limit Of Revenues.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_NetIncreasedCapacityCostsAndBaseRateReclassification">
    <definition>Net Increased Capacity Costs And Base Rate Reclassification.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_NonoperatingIncomeExpense">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ScheduleOfJointlyOwnedUtilityPlantsTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ProposedRateChangeLimitOfRevenues">
    <definition>Proposed Rate Change Limit Of Revenues.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_TrappedCostsAtSubsidiary">
    <definition>Trapped costs at subsidiary.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_EarningsPerShareBasic">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_SegmentReportingDisclosureTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PaymentsOfDividendsCommonStock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_MinimumLeasePaymentsSaleLeasebackTransactionsThereafter">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_TimePeriodOfPpa">
    <definition>Time period of PPA.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PublicUtilitiesPropertyPlantAndEquipmentTransmission">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanDebtSecurities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PrescriptionDrugSubsidyReceiptsYearFour">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_SegmentReportingInformationInterestAndInvestmentIncomeLoss">
    <definition>Segment reporting information interest and investment income loss.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LongTermDebtNoncurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PaymentObligationToRegistrantSubsidiarySixByOtherSubsidiariesUnderAvailabilityAgreement">
    <definition>Payment obligation to Registrant Subsidiary Six by other subsidiaries under Availability Agreement.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_CouponRateOfStormCostRecoveryBonds">
    <definition>Coupon rate of Storm cost recovery bonds.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_StateIncomeTaxesNetOfFederalIncomeTaxEffect">
    <definition>State income taxes net of federal income tax effect.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DerivativeAssetNotDesignatedAsHedgingInstrumentFairValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_CommitmentAmountPercentageOfFacilityFee">
    <definition>Commitment amount percentage of facility fee.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_FutureAmortizationExpenseYearTwo">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ChangesInCreditLineBorrowingsNet">
    <definition>Changes in credit line borrowings net.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DebtPolicyTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_InterestExpenses">
    <definition>Interest expenses.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="dei_EntityCommonStockSharesOutstanding">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_MaximumRecoveryNuclearInsurancePoliciesForPropertyDamageCausedByTerroristAct">
    <definition>Maximum recovery nuclear insurance policies for property damage caused by Terrorist Act.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PaymentsForCapitalImprovements">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AccidentalOutageCoverageProgramMaximumIndemnity">
    <definition>Accidental outage coverage program maximum indemnity.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ReconciliationOfFuelAndPurchasedPowerCost">
    <definition>Reconciliation of fuel and purchased power cost.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncomeTaxDisclosureTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_EstimatedPaymentsUnderPurchasedPowerAgreement">
    <definition>Estimated Payments under Purchased Power Agreement.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_SelfInsuredRetentionPerOccurrence">
    <definition>Self insured retention per occurrence.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PercentageOfCapacityAndEnergyAgreedToSellFromVariableInterestEntityToOtherSubsidiaries">
    <definition>Percentage of capacity and energy agreed to sell  fromVariable interest entity to other subsidiaries.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_TotalTaxAndInterestAssociatedWithIssue">
    <definition>Total tax and interest associated with this issue.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ProceedsFromInsuranceSettlementInvestingActivities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ImpairmentOfInvestments">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_IssueOfBondByGovernmentAuthority">
    <definition>Act 55 bonds issued by government authority.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DepositsWithToCoverUncertainTaxPositions">
    <definition>Deposits with the IRS to cover its uncertain tax positions.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AcquisitionsAndDispositionsTextBlock">
    <definition>Acquisitions and dispositions.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RateResetIncrease">
    <definition>Rate Reset Increase per formula rate plan filings with LPSC.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredFuelCost">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AssetsCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ReductionInTaxableIncomeWithinNonUtilityNuclear">
    <definition>Reduction in taxable income within Non-Utility Nuclear.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_FairValueOfDebtSecuritiesByContractualMaturitiesTextBlock">
    <definition>Fair value of debt securities by contractual maturities text block.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DecommissioningTrustFundBasis">
    <definition>Decommissioning trust fund basis.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PrescriptionDrugSubsidyReceiptsYearThree">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_SecuritizedRegulatoryTransitionAssetsNoncurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AccruedLiabilitiesCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AverageDilutiveEffectOfEquityUnitsPerShare">
    <definition>Average Dilutive Effect Of Equity Units Per Share.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PreferredUnitsAuthorized">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DecreaseInCombinedFuelAndNonFuelElectricRevenueRequirement">
    <definition>Decrease in combined fuel and non-fuel electric revenue requirement.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanAmortizationOfNetPriorServiceCostCredit">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_TaxesImposedOnRevenueProducingTransactionsPolicyTextBlock">
    <definition>Taxes imposed on revenue producing transactions.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanBeforeAdoptionOfSFAS158RecognitionProvisionsNetGainsLossesNotYetRecognized">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_EquityMethodInvestmentGainOnDisposalNetOfTax">
    <definition>Equity Method Investment Gain On Disposal Net Of Tax.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_NotesReduction">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AllocatedAmortizationCostInPercentage">
    <definition>Allocated amortization cost in percentage.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="dei_EntityVoluntaryFilers">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CapitalLeasesFutureMinimumPaymentsDue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock">
    <definition>Disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ProvisionsForRateRefundIncludingInterest">
    <definition>Provisions for rate refund including interest.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanTargetAllocationPercentageOfAssetsOtherRangeMinimum">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RegulatoryLiabilityForIncomeTaxes">
    <definition>Regulatory liability for income taxes.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_UnderFormulaRatePlanOverAndUnderEarningsOutsideAllowedRangeAreAllocatedToCustomersInPercent">
    <definition>Under the formula rate plan ,over and under earnings outside an allowed range are allocated to customers in percent.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ScheduleOfEstimatedFutureBenefitsPaymentsAndEstimatedFutureMedicareSubsidyReceiptsTextBlock">
    <definition>Schedule of Estimated Future Benefits Payments and Estimated Future Medicare Subsidy Receipts.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_FutureAmortizationExpenseYearFour">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_FairValuesOfDecommissioningTrustFundsAndRelatedAssetRetirementObligationRegulatoryAssetsTextBlock">
    <definition>Fair values of decommissioning trust funds and related asset retirement obligation regulatory assets.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ScheduleOfLineOfCreditFacilitiesTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_TotalDisallowanceCostsIncludingInterest">
    <definition>Total disallowance costs including interest.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ReturnOnCommonEquityOnFormulaRatePlan">
    <definition>Return on common equity on formula rate plan.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DividendsCommonStockCash">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanTargetAllocationPercentageOfAssetsEquitySecuritiesRangeMinimum">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_RedeemablePreferredStockSharesAuthorized">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_MinimumLeasePaymentsSaleLeasebackTransactions">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DecreaseInDecommissioningLiability">
    <definition>Decrease in Decommissioning Liability.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AmountWithdrawnFromRestrictedEscrowAccountAsApprovedByUnitsOfWhollyOwnedSubsidiary">
    <definition>Amount withdrawn from restricted escrow account as approved by the units of a wholly-owned subsidiary.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanContributionsByPlanParticipants">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecrease">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ShortTermBorrowingsAndOutstandingShortTermBorrowingsTextBlock">
    <definition>Short-term borrowings and the outstanding short-term borrowings.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_HedgeContractsInLiabilityPosition">
    <definition>Dollar amount of hedge contract in a liability position.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_SaleLeasebackTransactionInterestSold">
    <definition>Sale Leaseback Transaction Interest sold.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_FutureAmortizationExpenseYearOne">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherInventorySupplies">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherNonoperatingIncomeExpense">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PeriodOfAmortizationOfAccumulatedPostretirementBenefitObligations">
    <definition>Period Of Amortization Of Accumulated Postretirement Benefit Obligations.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PaymentsBasedOnPreviousYearProductionCosts">
    <definition>Payments based on previous year production costs.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_UtilityOperatingCompaniesCurrentRetailBaseRatesTextBlock">
    <definition>Utility operating companies current retail base rates.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AccountsReceivableNetCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_RegulatoryLiabilityCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_SfasRegulatoryAssetNet">
    <definition>Sfas Regulatory Asset Net</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncomeTaxExpenseBenefit">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RateIncrease">
    <definition>Rate increase.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_MaximumConventionalPropertyInsuranceCoverageOnAnnualAggregateBasis">
    <definition>Maximum Conventional property insurance Coverage on an annual aggregate basis.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PercentageOfPlantsOutputCoveredByPpa">
    <definition>Percentage of the plant's output covered by PPA.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AccidentalOutageCoverageProgramWaitingPeriod">
    <definition>Accidental outage coverage program waiting period.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AverageMaturityOfDebtSecuritiesInYears">
    <definition>Average maturity of debt securities.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PreferredStockDividendRatePercentageOrPerDollarAmount">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_LongTermDebt">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanAmortizationOfNetTransitionAssetObligation">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DerivativeLiabilityNotDesignatedAsHedgingInstrumentFairValue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="dei_EntityRegistrantName">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_NonQualifiedPensionCost">
    <definition>Non-Qualified pension cost including settlement charges related to the payment of lump sum benefits.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RateOfMortgageBonds">
    <definition>Rate of mortgage bonds.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_SegmentReportingInformationProfitLoss">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_KeyProvisionsOfRateCase">
    <definition>Earnings bandwidth included in New Orleans rate case.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RecommendedReductionInReturnOnCurrentRatesByLpscStaff">
    <definition>Recommended reduction in return on current rates by Lpsc staff.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_SummaryOfBorrowingsOutstandingAndCapacityAvailableUnderFacilityTextBlock">
    <definition>Summary of the borrowings outstanding and capacity available under the facility.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DeferredTaxLiabilitiesNuclearDecommissioningTrusts">
    <definition>Deferred Tax Liabilities, Nuclear Decommissioning Trusts.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_RegulatoryLiabilities">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncomeTaxReconciliationTaxCreditsInvestment">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_IncreaseInRevenueAsResultOfImplementationOfSettlement">
    <definition>Increase in revenue as a result of implementation of settlement.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AvailableForSaleSecuritiesIncomeTaxExpenseOnChangeInUnrealizedHoldingGainOrLoss">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AnnualDistributionRate">
    <definition>Annual distribution rate.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetOriginated">
    <definition>Fair value measurement with unobservable inputs reconciliation recurring basis asset originated.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_AdditionalIncreaseInGasBaseRate">
    <definition>Additional increase in gas base rate.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ScheduleOfRegulatoryAssetsAndLiabilitiesTextBlock">
    <definition>Schedule of Regulatory Assets and Liabilities.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ChangeInAssetRetirementObligationTextBlock">
    <definition>Change in Asset Retirement Obligation.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_NumberOfLicensedReactors">
    <definition>Number of licensed reactors.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_UnrecoverableRemovalCostsAssociatedWithTerminationOfLease">
    <definition>Unrecoverable removal costs associated with the termination of lease.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RateAtWhichElectricitySoldToRetailCustomers">
    <definition>Rate at which electricity sold to retail customers.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_EmployeeServiceShareBasedCompensationUnrecognizedCompensationCostsOnNonvestedAwardsWeightedAveragePeriodOfRecognition">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_GasDomesticRegulatedRevenue">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PropertyInsuranceMinimumRequirementPerSiteForNuclearPowerPlantLicensees">
    <definition>Property insurance minimum requirement per site for nuclear power plant licensees.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DecommissioningTrustAssetsAmount">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_SegmentReportingInformationInterestExpense">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="dei_DocumentFiscalPeriodFocus">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_InterestPayableCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_TotalFederalAndStateTaxIncludedInUnrecognizedTaxBenefits">
    <definition>Total federal and state tax included in unrecognized tax benefits.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_EquityMethodInvestmentsDisclosureTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ProceedsFromSaleOfProductiveAssets">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanOtherPlanAssets">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_CapitalLossForTaxDueToSaleOfPreferredShares">
    <definition>Capital Loss For Tax Due To Sale Of Preferred Shares.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ProceedFromLoanByGovernmentAuthorityToCorporation">
    <definition>Act 55 bond proceeds.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_CumulativeEffectOfInitialAdoptionOfNewAccountingPrinciple">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RevolvingCreditFacilityPursuantToInterCompanyCreditAgreement">
    <definition>Revolving Credit Facility Pursuant To Inter Company Credit Agreement.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_ScheduleOfVariableInterestEntitiesTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_DeferredTaxAssetsCustomerDeposits">
    <definition>Deferred Tax Assets, Customer Deposits.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_LettersOfCredit">
    <definition>Letters of credit.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_EstimatedPaymentsBasedOnProductionCosts">
    <definition>Estimated payments based on production costs.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RevenueDeficiency">
    <definition>Revenue deficiency.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ScheduleOfPreferredEquityTextBlock">
    <definition>Schedule of Preferred Equity.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DeferredTaxAssetsOther">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_IncreaseReflectingReturnOnCommonEquity">
    <definition>Rate Increase requested in Texas rate case.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanContributionsByEmployer">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_AssetRetirementObligationLiabilitiesSettled">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DebtDisclosureTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DebtInstrumentPeriodicPayment">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearTwo">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_ExpirationDate">
    <definition>Expiration Date.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_EquityMethodInvestmentsTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_RecoverableCostsIncludingEstimatedCostsForWorksToBeCompleted">
    <definition>Recoverable costs including estimated costs for works to be completed.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_PaymentsForRailcarOperatingLease">
    <definition>Payments for railcar operating lease.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="etr_NuclearRefuelingOutageExpenses">
    <definition>Amortization of costs deferred during nuclear refueling outages over the estimated period to the next outage because these refueling outage expenses are incurred to prepare the units to operate for the next operating cycle without having to be taken off line.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_IncreaseDecreaseInInterestPayableNet">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_SegmentReportingInformationExpendituresForAdditionsToLongLivedAssets">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
  <Element Id="us-gaap_DebtInstrumentAnnualPrincipalPayment">
    <definition>No authoritative reference available.</definition>
    <reference>No authoritative reference available.</reference>
  </Element>
</DefinitionAndReference>
