Risk Management and Fair Values (Schedules Of Valuation Techniques) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Effect of Significant Unobservable Inputs on Fair Value of Electricity Swaps	$ 7
Entergy Arkansas [Member]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Value	0.6	2.7	0.7	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	15.0	7.8
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Purchases Sales Issuances Settlements	(15.1)	(5.1)
Entergy Gulf States Louisiana [Member]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Value	5.0	5.4	14.4	6.7
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(2.0)	7.7
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Purchases Sales Issuances Settlements	(7.4)	(9.0)
Entergy Louisiana [Member]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Value	3.8	3.0	11.1	5.7
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(0.2)	5.3
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Purchases Sales Issuances Settlements	(7.1)	(8.0)
Entergy Mississippi [Member]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Value	0.9	4.8	3.4	1.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0.8	11.6
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Purchases Sales Issuances Settlements	(3.3)	(7.8)
Entergy New Orleans [Member]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Value	1.4	1.0	4.1	2.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(1.1)	2.0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Purchases Sales Issuances Settlements	(1.6)	(3.0)
Entergy Texas [Member]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Value	3.4	7.4	12.3	18.4
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(10.3)	1.8
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Purchases Sales Issuances Settlements	1.4	(12.8)
Parent Company [Member]
Range From Average Percentage for Electricity Options	65.00%
Range from Average Percentage for Fair Value of Electricity Swaps	3.00%
Effect of Significant Unobservable Inputs on Fair Value of Electricity Options	32
Fair Value of Electricity Options	36
Fair Value of Electricity Swaps	$ 109