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Preferred Equity (Narratives) (Details) (USD $)
12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2007
Dec. 31, 2013
Dec. 31, 2014
Preferred Equity [Line Items]      
Shares purchased by subsidiaries 160,000etr_PreferredSharesPurchasedBySubsidiaryFromOtherShareholders    
Entergy Gulf States Louisiana [Member]      
Preferred Equity [Line Items]      
Preferred units outstanding   100,000us-gaap_PreferredUnitsOutstanding
/ dei_LegalEntityAxis
= etr_EntergyGulfStatesLouisianaMember
100,000us-gaap_PreferredUnitsOutstanding
/ dei_LegalEntityAxis
= etr_EntergyGulfStatesLouisianaMember
Entergy Louisiana [Member]      
Preferred Equity [Line Items]      
Preferred units outstanding   1,000,000us-gaap_PreferredUnitsOutstanding
/ dei_LegalEntityAxis
= etr_EntergyLouisianaMember
1,000,000us-gaap_PreferredUnitsOutstanding
/ dei_LegalEntityAxis
= etr_EntergyLouisianaMember
Preferred Stock, 8.75% Rate [Member] | Entergy Finance Holding Inc [Member]      
Preferred Equity [Line Items]      
Preferred stock/preferred membership interests rate   8.75%us-gaap_PreferredStockDividendRatePercentage
/ dei_LegalEntityAxis
= etr_EntergyFinanceHoldingIncMember
/ us-gaap_StatementClassOfStockAxis
= etr_PreferredStockEightPointSevenFivePercentRateMember
 
Temporary Equity, Shares Issued   250,000us-gaap_TemporaryEquitySharesIssued
/ dei_LegalEntityAxis
= etr_EntergyFinanceHoldingIncMember
/ us-gaap_StatementClassOfStockAxis
= etr_PreferredStockEightPointSevenFivePercentRateMember
 
Temporary Equity, Par Value   $ 100us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital
/ dei_LegalEntityAxis
= etr_EntergyFinanceHoldingIncMember
/ us-gaap_StatementClassOfStockAxis
= etr_PreferredStockEightPointSevenFivePercentRateMember
 
Temporary Equity, Redemption Price Per Share   $ 100us-gaap_TemporaryEquityRedemptionPricePerShare
/ dei_LegalEntityAxis
= etr_EntergyFinanceHoldingIncMember
/ us-gaap_StatementClassOfStockAxis
= etr_PreferredStockEightPointSevenFivePercentRateMember
 
Preferred Stock, Cumulative $100 Par Value, 4.72% Series [Member] | Entergy Arkansas [Member]      
Preferred Equity [Line Items]      
Preferred stock/preferred membership interests rate     4.72%us-gaap_PreferredStockDividendRatePercentage
/ dei_LegalEntityAxis
= etr_EntergyArkansasMember
/ us-gaap_StatementClassOfStockAxis
= etr_PreferredStockCumulativeOneHundredDollarParValueFourPointSevenTwoPercentSeriesMember
Preferred Stock, Cumulative $100 Par Value, 4.75% Series [Member] | Entergy New Orleans [Member]      
Preferred Equity [Line Items]      
Preferred stock/preferred membership interests rate     4.75%us-gaap_PreferredStockDividendRatePercentage
/ dei_LegalEntityAxis
= etr_EntergyNewOrleansMember
/ us-gaap_StatementClassOfStockAxis
= etr_PreferredStockCumulativeOneHundredDollarParValueFourPointSevenFivePercentSeriesMember