XML 75 R124.htm IDEA: XBRL DOCUMENT v2.4.1.9
Risk Management and Fair Values (Fair Values Of Derivative Instruments) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Liabilities:    
Cash collateral posted   $ 47us-gaap_CollateralAlreadyPostedAggregateFairValue
Cash collateral held 25us-gaap_CashCollateralForBorrowedSecurities 4us-gaap_CashCollateralForBorrowedSecurities
Prepayments And Other [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Designated as Hedging Instrument [Member]    
Assets:    
Derivative asset, fair value 149us-gaap_DerivativeFairValueOfDerivativeAsset
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/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [1] 118us-gaap_DerivativeFairValueOfDerivativeAsset
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= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_ElectricityFuturesForwardsSwapsAndOptionsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [1]
Derivative asset as hedging instrument offset (53)us-gaap_DerivativeCollateralObligationToReturnCash
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
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= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [2] (99)us-gaap_DerivativeCollateralObligationToReturnCash
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_ElectricityFuturesForwardsSwapsAndOptionsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [2]
Derivative asset, net 96.0us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_ElectricityFuturesForwardsSwapsAndOptionsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [3],[4] 19.0us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_ElectricityFuturesForwardsSwapsAndOptionsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [3],[4]
Prepayments And Other [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Not Designated As Hedging Instrument [Member]    
Assets:    
Derivative asset, fair value 97us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_ElectricityFuturesForwardsSwapsAndOptionsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [1] 177us-gaap_DerivativeFairValueOfDerivativeAsset
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= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_ElectricityFuturesForwardsSwapsAndOptionsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [1]
Derivative asset as hedging instrument offset (25)us-gaap_DerivativeCollateralObligationToReturnCash
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_ElectricityFuturesForwardsSwapsAndOptionsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [2] (122)us-gaap_DerivativeCollateralObligationToReturnCash
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_ElectricityFuturesForwardsSwapsAndOptionsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [2]
Derivative asset, net 72.0us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_ElectricityFuturesForwardsSwapsAndOptionsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [3],[4] 55.0us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_ElectricityFuturesForwardsSwapsAndOptionsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [3],[4]
Prepayments And Other [Member] | Natural Gas Swaps [Member] | Utility Plants [Member] | Not Designated As Hedging Instrument [Member]    
Assets:    
Derivative asset, fair value   6us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_NaturalGasSwapsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_UtilityMember		 [1]
Derivative asset as hedging instrument offset   0us-gaap_DerivativeCollateralObligationToReturnCash
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_NaturalGasSwapsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_UtilityMember		 [2]
Derivative asset, net   6.0us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_NaturalGasSwapsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_UtilityMember		 [3],[4]
Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Utility and Entergy Wholesale Commodities [Member] | Not Designated As Hedging Instrument [Member]    
Assets:    
Derivative asset, fair value 50us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
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/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_UtilityandEntergyWholesaleCommoditiesMember		 [1] 36us-gaap_DerivativeFairValueOfDerivativeAsset
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= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_FixedTransmissionRightsFTRsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_UtilityandEntergyWholesaleCommoditiesMember		 [1]
Derivative asset as hedging instrument offset (3)us-gaap_DerivativeCollateralObligationToReturnCash
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
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/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_UtilityandEntergyWholesaleCommoditiesMember		 [2] (2)us-gaap_DerivativeCollateralObligationToReturnCash
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/ us-gaap_DerivativeInstrumentRiskAxis
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/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_UtilityandEntergyWholesaleCommoditiesMember		 [2]
Derivative asset, net 47.0us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_FixedTransmissionRightsFTRsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_UtilityandEntergyWholesaleCommoditiesMember		 [3],[4] 34.0us-gaap_DerivativeAssets
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= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_FixedTransmissionRightsFTRsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_UtilityandEntergyWholesaleCommoditiesMember		 [3],[4]
Other Deferred Debits And Other Assets [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Designated as Hedging Instrument [Member]    
Assets:    
Derivative asset, fair value 48us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= etr_OtherDeferredDebitsAndOtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
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/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [1] 17us-gaap_DerivativeFairValueOfDerivativeAsset
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/ us-gaap_DerivativeInstrumentRiskAxis
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/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [1]
Derivative asset as hedging instrument offset 0us-gaap_DerivativeCollateralObligationToReturnCash
/ us-gaap_BalanceSheetLocationAxis
= etr_OtherDeferredDebitsAndOtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_ElectricityFuturesForwardsSwapsAndOptionsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [2] (17)us-gaap_DerivativeCollateralObligationToReturnCash
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= etr_OtherDeferredDebitsAndOtherAssetsMember
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/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [2]
Derivative asset, net 48.0us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= etr_OtherDeferredDebitsAndOtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_ElectricityFuturesForwardsSwapsAndOptionsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [3],[4] 0us-gaap_DerivativeAssets
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/ us-gaap_DerivativeInstrumentRiskAxis
= etr_ElectricityFuturesForwardsSwapsAndOptionsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [3],[4]
Other Deferred Debits And Other Assets [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Not Designated As Hedging Instrument [Member]    
Assets:    
Derivative asset, fair value 9us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= etr_OtherDeferredDebitsAndOtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
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/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [1]  
Derivative asset as hedging instrument offset (8)us-gaap_DerivativeCollateralObligationToReturnCash
/ us-gaap_BalanceSheetLocationAxis
= etr_OtherDeferredDebitsAndOtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
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/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [2]  
Derivative asset, net 1.0us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= etr_OtherDeferredDebitsAndOtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
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/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [3],[4]  
Other Non-Current Liabilities [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Designated as Hedging Instrument [Member]    
Liabilities:    
Derivative Liability, Fair Value, Gross Liability   46us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
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/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [1]
Derivative liability as hedging instrument offset   (17)us-gaap_DerivativeCollateralRightToReclaimCash
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_ElectricityFuturesForwardsSwapsAndOptionsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [2]
Derivative liability, net   29.0us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_ElectricityFuturesForwardsSwapsAndOptionsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [3],[4]
Derivative Liability, Fair Value, Gross Liability   46us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
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/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [1]
Other Non-Current Liabilities [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Not Designated As Hedging Instrument [Member]    
Liabilities:    
Derivative Liability, Fair Value, Gross Liability 8us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
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/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [1]  
Derivative liability as hedging instrument offset (8)us-gaap_DerivativeCollateralRightToReclaimCash
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/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [2]  
Derivative liability, net 0us-gaap_DerivativeLiabilities
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/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [3],[4]  
Derivative Liability, Fair Value, Gross Liability 8us-gaap_DerivativeFairValueOfDerivativeLiability
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/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [1]  
Other Current Liabilities [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Designated as Hedging Instrument [Member]    
Liabilities:    
Derivative Liability, Fair Value, Gross Liability 24us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
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/ us-gaap_StatementBusinessSegmentsAxis
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/ us-gaap_StatementBusinessSegmentsAxis
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Derivative liability as hedging instrument offset (24)us-gaap_DerivativeCollateralRightToReclaimCash
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Derivative liability, net 0us-gaap_DerivativeLiabilities
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Derivative Liability, Fair Value, Gross Liability 24us-gaap_DerivativeFairValueOfDerivativeLiability
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= us-gaap_DesignatedAsHedgingInstrumentMember
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= etr_EntergyWholesaleCommoditiesMember		 [1]
Other Current Liabilities [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Not Designated As Hedging Instrument [Member]    
Liabilities:    
Derivative Liability, Fair Value, Gross Liability 57us-gaap_DerivativeFairValueOfDerivativeLiability
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Derivative liability as hedging instrument offset (55)us-gaap_DerivativeCollateralRightToReclaimCash
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Derivative liability, net 2.0us-gaap_DerivativeLiabilities
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= etr_EntergyWholesaleCommoditiesMember		 [3],[4] 112.0us-gaap_DerivativeLiabilities
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/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [3],[4]
Derivative Liability, Fair Value, Gross Liability 57us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_ElectricityFuturesForwardsSwapsAndOptionsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [1] 201us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_ElectricityFuturesForwardsSwapsAndOptionsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_EntergyWholesaleCommoditiesMember		 [1]
Other Current Liabilities [Member] | Natural Gas Swaps [Member] | Utility Plants [Member] | Not Designated As Hedging Instrument [Member]    
Liabilities:    
Derivative Liability, Fair Value, Gross Liability 20us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_NaturalGasSwapsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_UtilityMember		 [1]  
Derivative liability as hedging instrument offset 0us-gaap_DerivativeCollateralRightToReclaimCash
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_NaturalGasSwapsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_UtilityMember		 [2]  
Derivative liability, net 20.0us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_NaturalGasSwapsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_UtilityMember		 [3],[4]  
Derivative Liability, Fair Value, Gross Liability 20us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_NaturalGasSwapsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_StatementBusinessSegmentsAxis
= etr_UtilityMember		 [1]  
Entergy Gulf States Louisiana [Member] | Gas Hedge Contracts [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]    
Assets:    
Derivative asset, net   2.2us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= etr_GasHedgeContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_NaturalGasSwapsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ dei_LegalEntityAxis
= etr_EntergyGulfStatesLouisianaMember		 [5]
Entergy Gulf States Louisiana [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]    
Assets:    
Derivative asset, net 14.4us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_FixedTransmissionRightsFTRsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ dei_LegalEntityAxis
= etr_EntergyGulfStatesLouisianaMember		 [5] 6.7us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_FixedTransmissionRightsFTRsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ dei_LegalEntityAxis
= etr_EntergyGulfStatesLouisianaMember		 [5]
Entergy Gulf States Louisiana [Member] | Other Current Liabilities [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]    
Liabilities:    
Derivative liability, net 8.2us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_NaturalGasSwapsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ dei_LegalEntityAxis
= etr_EntergyGulfStatesLouisianaMember		 [5]  
Entergy Louisiana [Member] | Gas Hedge Contracts [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]    
Assets:    
Derivative asset, net   2.9us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= etr_GasHedgeContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_NaturalGasSwapsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ dei_LegalEntityAxis
= etr_EntergyLouisianaMember		 [5]
Entergy Louisiana [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]    
Assets:    
Derivative asset, net 11.1us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_FixedTransmissionRightsFTRsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ dei_LegalEntityAxis
= etr_EntergyLouisianaMember		 [5] 5.7us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_FixedTransmissionRightsFTRsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ dei_LegalEntityAxis
= etr_EntergyLouisianaMember		 [5]
Entergy Louisiana [Member] | Other Current Liabilities [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]    
Liabilities:    
Derivative liability, net 7.6us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_NaturalGasSwapsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ dei_LegalEntityAxis
= etr_EntergyLouisianaMember		 [5]  
Entergy Mississippi [Member] | Prepayments And Other [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]    
Assets:    
Derivative asset, net   0.7us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_NaturalGasSwapsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ dei_LegalEntityAxis
= etr_EntergyMississippiMember		 [5]
Entergy Mississippi [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]    
Assets:    
Derivative asset, net 3.4us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_FixedTransmissionRightsFTRsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ dei_LegalEntityAxis
= etr_EntergyMississippiMember		 [5] 1.0us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_FixedTransmissionRightsFTRsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ dei_LegalEntityAxis
= etr_EntergyMississippiMember		 [5]
Entergy Mississippi [Member] | Other Current Liabilities [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]    
Liabilities:    
Derivative liability, net 2.8us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_NaturalGasSwapsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ dei_LegalEntityAxis
= etr_EntergyMississippiMember		 [5]  
Entergy New Orleans [Member] | Prepayments And Other [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]    
Assets:    
Derivative asset, net   0.1us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_NaturalGasSwapsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ dei_LegalEntityAxis
= etr_EntergyNewOrleansMember		 [5]
Entergy New Orleans [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]    
Assets:    
Derivative asset, net 4.1us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_FixedTransmissionRightsFTRsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ dei_LegalEntityAxis
= etr_EntergyNewOrleansMember		 [5] 2.0us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_FixedTransmissionRightsFTRsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ dei_LegalEntityAxis
= etr_EntergyNewOrleansMember		 [5]
Entergy New Orleans [Member] | Other Current Liabilities [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]    
Liabilities:    
Derivative liability, net 0.9us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_NaturalGasSwapsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ dei_LegalEntityAxis
= etr_EntergyNewOrleansMember		 [5]  
Entergy Texas [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]    
Assets:    
Derivative asset, net 12.3us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_FixedTransmissionRightsFTRsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ dei_LegalEntityAxis
= etr_EntergyTexasMember		 [5] 18.4us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_FixedTransmissionRightsFTRsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ dei_LegalEntityAxis
= etr_EntergyTexasMember		 [5]
Entergy Arkansas [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]    
Assets:    
Derivative asset, net $ 0.7us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= etr_PrepaymentsAndOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= etr_FixedTransmissionRightsFTRsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ dei_LegalEntityAxis
= etr_EntergyArkansasMember		 [5]  
[1] Represents the gross amounts of recognized assets/liabilities
[2] Represents the netting of fair value balances with the same counterparty
[3] Excludes cash collateral in the amounts of $25 million held as of December 31, 2014 and $47 million posted and $4 million held as of December 31, 2013, respectively
[4] Represents the net amounts of assets/liabilities presented on the Entergy Consolidated Balance Sheets
[5] (a) No cash collateral was required to be posted as of December 31, 2014 and 2013, respectively.