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Quarterly Financial Data (Narrative) (Details) (USD $)
3 Months Ended 12 Months Ended 1 Months Ended
Mar. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]          
Asset impairment charges $ 355,500,000us-gaap_AssetImpairmentCharges $ 154,000,000us-gaap_AssetImpairmentCharges $ 322,000,000us-gaap_AssetImpairmentCharges    
After tax asset impairment charge 223,500,000etr_AfterTaxAssetImpairmentCharge 100,000,000etr_AfterTaxAssetImpairmentCharge 202,000,000etr_AfterTaxAssetImpairmentCharge    
Restructuring costs incurred, net of tax   12,000,000etr_RestructuringChargesNetOfTax 70,000,000etr_RestructuringChargesNetOfTax    
Entergy Mississippi [Member]          
Restructuring Cost and Reserve [Line Items]          
Write-Off Of Regulatory Asset For New Nuclear   56,225,000etr_WriteOffOfRegulatoryAssetForNewNuclear
/ dei_LegalEntityAxis
= etr_EntergyMississippiMember
0etr_WriteOffOfRegulatoryAssetForNewNuclear
/ dei_LegalEntityAxis
= etr_EntergyMississippiMember
0etr_WriteOffOfRegulatoryAssetForNewNuclear
/ dei_LegalEntityAxis
= etr_EntergyMississippiMember
 
Write-Off Of Regulatory Asset For New Nuclear, After Tax   36,700,000etr_WriteOffOfRegulatoryAssetForNewNuclearAfterTax
/ dei_LegalEntityAxis
= etr_EntergyMississippiMember
     
Human Capital Management Strategic Initiative [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring costs incurred, pre-tax     110,000,000us-gaap_RestructuringAndRelatedCostIncurredCost
/ us-gaap_RestructuringPlanAxis
= etr_HumanCapitalManagementStrategicInitiativeMember
   
Restructuring costs incurred, net of tax     70,000,000etr_RestructuringChargesNetOfTax
/ us-gaap_RestructuringPlanAxis
= etr_HumanCapitalManagementStrategicInitiativeMember
   
Human Capital Management Strategic Initiative [Member] | Entergy Louisiana [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring costs, deferred recovery, pre-tax         45,000,000etr_RestructuringandRelatedCostDeferredRecoveryBeforeTax
/ dei_LegalEntityAxis
= etr_EntergyLouisianaMember
/ us-gaap_RestructuringPlanAxis
= etr_HumanCapitalManagementStrategicInitiativeMember
Restructuring costs, deferred recovery, net of tax         30,000,000etr_RestructuringandRelatedCostDeferredRecoveryAfterTax
/ dei_LegalEntityAxis
= etr_EntergyLouisianaMember
/ us-gaap_RestructuringPlanAxis
= etr_HumanCapitalManagementStrategicInitiativeMember
Human Capital Management Strategic Initiative [Member] | Entergy Arkansas [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring costs, deferred recovery, pre-tax         45,000,000etr_RestructuringandRelatedCostDeferredRecoveryBeforeTax
/ dei_LegalEntityAxis
= etr_EntergyArkansasMember
/ us-gaap_RestructuringPlanAxis
= etr_HumanCapitalManagementStrategicInitiativeMember
Restructuring costs, deferred recovery, net of tax         $ 30,000,000etr_RestructuringandRelatedCostDeferredRecoveryAfterTax
/ dei_LegalEntityAxis
= etr_EntergyArkansasMember
/ us-gaap_RestructuringPlanAxis
= etr_HumanCapitalManagementStrategicInitiativeMember