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Equity Method Investments (Schedule Of Equity Method Investments) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
RS Cogen LLC [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership Percentage     50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= etr_RsCogenLlcMember
Top Deer [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership Percentage     50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= etr_TopDeerMember
RS Cogen [Member]      
Schedule of Equity Method Investments [Line Items]      
Intercompany operating expenses $ 3.2us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= etr_RsCogenMember		 $ 2.8us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= etr_RsCogenMember