2.2.0.25truefalse06081 - Disclosure - Risk Management and Fair Values (Details Textuals)truefalseIn Millions, unless otherwise specifiedfalse1falsefalseUSDfalsefalse1/1/2011 - 3/31/2011 USD ($) USD ($) / shares $Jan-01-2011_Mar-31-2011http://www.sec.gov/CIK0000065984duration2011-01-01T00:00:002011-03-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$2falsefalseUSDfalsefalse1/1/2010 - 3/31/2010 USD ($) USD ($) / shares $ThreeMonthsEnded_31Mar2010http://www.sec.gov/CIK0000065984duration2010-01-01T00:00:002010-03-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0us-gaap_DerivativeInstrumentsGainLossLineItemsus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringLine items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.falsefalseDerivative Instruments, Gain (Loss) [Line Items]3false0etr_VolumeOfNaturalGasSwapsOutstandingetrfalsenainstantTotal volume of natural gas swaps outstanding.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse5437000054370000falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:integerItemTypeintegerTotal volume of natural gas swaps outstanding.No authoritative reference available.falsefalseTotal volume of natural gas swaps outstanding (MMBtu)4true0etr_RiskManagementAndFairValuesTextualsAbstractetrfalsenadurationRisk Management and Fair Values Textuals Abstract.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk Management and Fair Values Textuals Abstract.falsefalseRisk Management and Fair Values (Textuals) [Abstract]5false0us-gaap_UnrealizedGainLossOnCashFlowHedgingInstrumentsus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse7700000077falsetruefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAmount of unrealized gain (loss) related to derivatives designated as cash flow hedging instruments, recorded in results of operations to the extent that the cash flow hedge is determined to be ineffective.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(1) falsefalseCash flow hedges relating to power sales as part of net gains6false0us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonthsus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse8600000086falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe estimated net amount of existing gains (losses) on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(2) falsefalseReclassified from accumulated other comprehensive income (OCI) to operating revenues7false0us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNetus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse2900000029falsefalsefalsefalsefalse2truefalsefalse3800000038falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe income statement location of the effective portion of net gain or loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -Clause 3 falsefalseAmount of gain (loss) reclassified from accumulated OCI into income (effective portion)8false0etr_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionTaxetrfalsecreditdurationDerivative Instruments Gain Loss Reclassified From Accumulated OCI Into Income Effective Portion, Tax.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse1000000010falsefalsefalsefalsefalse2truefalsefalse1300000013falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryDerivative Instruments Gain Loss Reclassified From Accumulated OCI Into Income Effective Portion, Tax.No authoritative reference available.falsefalseMaturity of cash flow hedges, Tax9false0etr_MaximumLengthOfTimeOverWhichCompanyIsCurrentlyHedgingVariabilityInFutureCashFlowsForForecastedPowerTransactionsetrfalsenainstantMaximum length of time over which Company is currently hedging the variability in future cash flows with derivatives for...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00approximately 3.75 yearsfalsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherus-types:durationStringItemTypenormalizedstringMaximum length of time over which Company is currently hedging the variability in future cash flows with derivatives for forecasted power transactions.No authoritative reference available.falsefalseMaximum length of time over which Company is currently hedging the variability in future cash flows for forecasted power transactions10false0etr_PlannedGenerationSoldForwardFromNonUtilityNuclearPowerPlantsetrfalsenainstantPlanned Generation Sold Forward From Wholesale Commodities.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truetruefalse0.960.96falsefalsefalsefalsefalse2falsetruefalse00falsefalsefalsefalsefalseOtherus-types:percentItemTypepurePlanned Generation Sold Forward From Wholesale Commodities.No authoritative reference available.falsefalsePlanned generation sold forward from Wholesale Commodities11false0etr_PlannedGenerationFromNonNuclearPowerPlantsSoldForwardUnderFinancialDerivativesetrfalsenainstantPlanned Generation From Non Nuclear Power Plants Sold Forward Under Financial Hedgesfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truetruefalse0.450.45falsefalsefalsefalsefalse2falsetruefalse00falsefalsefalsefalsefalseOtherus-types:percentItemTypepurePlanned Generation From Non Nuclear Power Plants Sold Forward Under Financial HedgesNo authoritative reference available.falsefalsePlanned Generation Sold Forward under financial derivatives12false0etr_HedgeContractsInLiabilityPositionetrfalsecreditinstantDollar amount of hedge contract in a liability position.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse2700000027falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryDollar amount of hedge contract in a liability position.No authoritative reference available.falsefalseDollar amount of hedge contract in a liability position13false0etr_CashFlowHedgesMoneyContractsetrfalsedebitinstantCash flow hedges money contracts.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse136000000136falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryCash flow hedges money contracts.No authoritative reference available.falsefalseCash flow hedges in-the-money contracts14false0etr_CashFlowHedgesOutOfMoneyContractsetrfalsecreditinstantCash flow hedges out-of-the-money contracts.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse3200000032falsetruefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryCash flow hedges out-of-the-money contracts.No authoritative reference available.falsefalseCash flow hedges out-of-the-money contracts15false0etr_AverageCouponRateOfDebtSecuritiesPercentageetrfalsenainstantAverage Coupon Rate Of Debt Securities Percentage.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truetruefalse0.04240.0424falsefalsefalsefalsefalse2falsetruefalse00falsefalsefalsefalsefalseOtherus-types:percentItemTypepureAverage Coupon Rate Of Debt Securities Percentage.No authoritative reference available.falsefalseAverage coupon rate of debt securities16false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://entergy.com/role/riskmanagementandfairvaluesdetailstextuals1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalseUSDtruefalse{dei_LegalEntityAxis} : Entergy Gulf States Louisiana [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Entergy_Gulf_States_Louisiana_Memberhttp://www.sec.gov/CIK0000065984instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseEntergy Gulf States Louisiana [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldietr_EntergyGulfStatesLouisianaMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseEntergy Gulf States Louisiana [Member]17true0us-gaap_DerivativeInstrumentsGainLossLineItemsus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringLine items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.falsefalseDerivative Instruments, Gain (Loss) [Line Items]18false0etr_VolumeOfNaturalGasSwapsOutstandingetrfalsenainstantTotal volume of natural gas swaps outstanding.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse1296000012960000falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:integerItemTypeintegerTotal volume of natural gas swaps outstanding.No authoritative reference available.falsefalseTotal volume of natural gas swaps outstanding (MMBtu)20false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://entergy.com/role/riskmanagementandfairvaluesdetailstextuals1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse4falsefalseUSDtruefalse{dei_LegalEntityAxis} : Entergy Louisiana [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Entergy_Louisiana_Memberhttp://www.sec.gov/CIK0000065984instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseEntergy Louisiana [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldietr_EntergyLouisianaMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseEntergy Louisiana [Member]21true0us-gaap_DerivativeInstrumentsGainLossLineItemsus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringLine items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.falsefalseDerivative Instruments, Gain (Loss) [Line Items]22false0etr_VolumeOfNaturalGasSwapsOutstandingetrfalsenainstantTotal volume of natural gas swaps outstanding.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse2501000025010000falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:integerItemTypeintegerTotal volume of natural gas swaps outstanding.No authoritative reference available.falsefalseTotal volume of natural gas swaps outstanding (MMBtu)24false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://entergy.com/role/riskmanagementandfairvaluesdetailstextuals1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse5falsefalseUSDtruefalse{dei_LegalEntityAxis} : Entergy Mississippi [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Entergy_Mississippi_Memberhttp://www.sec.gov/CIK0000065984instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseEntergy Mississippi [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldietr_EntergyMississippiMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseEntergy Mississippi [Member]25true0us-gaap_DerivativeInstrumentsGainLossLineItemsus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringLine items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.falsefalseDerivative Instruments, Gain (Loss) [Line Items]26false0etr_VolumeOfNaturalGasSwapsOutstandingetrfalsenainstantTotal volume of natural gas swaps outstanding.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse1640000016400000falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:integerItemTypeintegerTotal volume of natural gas swaps outstanding.No authoritative reference available.falsefalseTotal volume of natural gas swaps outstanding (MMBtu)223Risk Management and Fair Values (Details Textuals) (USD $)MillionsUnKnownUnKnownUnKnowntruetrue