2.2.0.7 true Risk Management and Fair Values (Details) (USD $) 0608 - Disclosure - Risk Management and Fair Values (Details) true false In Millions false false 1 USD false false USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 $ false 2 USD false false USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 3 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 4 USD false false USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 5 USD false false Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 6 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 7 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ 10 Derivative instruments designated as cash flow hedges on consolidated statements of income 2 us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeNetAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 12 Amount of gain (loss) reclassified from accumulated OCI into income (effective portion) 2 us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 true true false false 43000000 43 false false false 2 false false false false 0 0 false false false 3 true true false false 146000000 146 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false xbrli:monetaryItemType monetary The 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 false 14 Risk Management and Fair Values (Textuals) [Abstract] 2 etr_RiskManagementAndFairValuesTextualsAbstract etr false na duration Risk Management and Fair Values Textuals Abstract. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false xbrli:stringItemType string Risk Management and Fair Values Textuals Abstract. false 15 Cash flow hedges relating to power sales as part of net gains 2 us-gaap_UnrealizedGainLossOnCashFlowHedgingInstruments us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 384000000 384 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false xbrli:monetaryItemType monetary Amount 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) false 16 Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months 2 us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 240000000 240 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false xbrli:monetaryItemType monetary The 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. 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No authoritative reference available. false 19 Planned generation sold forward from Non-Nuclear power plants 2 etr_PlannedGenerationSoldForwardFromNonUtilityNuclearPowerPlants etr false na instant PlannedGenerationSoldForwardFromNonUtilityNuclearPowerPlants. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0.9 0.9 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false us-types:percentItemType pure PlannedGenerationSoldForwardFromNonUtilityNuclearPowerPlants. No authoritative reference available. false 20 Planned Generation Sold Forward under financial derivatives 2 etr_PlannedGenerationFromNonNuclearPowerPlantsSoldForwardUnderFinancialDerivatives etr false na instant Planned Generation From Non Nuclear Power Plants Sold Forward Under Financial Hedges false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0.42 0.42 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false us-types:percentItemType pure Planned Generation From Non Nuclear Power Plants Sold Forward Under Financial Hedges No authoritative reference available. false 21 Planned Generation Sold Forward under normal purchase/sale contracts 2 etr_PlannedGenerationSoldForwardUnderNormalPurchaseSaleContracts etr false na instant Planned Generation Sold Forward under normal purchase/sale contracts. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0.42 0.42 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false us-types:percentItemType pure Planned Generation Sold Forward under normal purchase/sale contracts. No authoritative reference available. false 22 Hedge contracts in liability position 2 etr_HedgeContractsInLiabilityPosition etr false credit instant Hedge contracts in liability position. false false false false false false false false false false false verboselabel false 1 false true false false 1000000 1 false false false 2 false false false false 0 0 false false false 3 false true false false 1000000 1 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false xbrli:monetaryItemType monetary Hedge contracts in liability position. 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Such securities are reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain or loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis. 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