Retirement, Other Postretirement Benefits, And Defined Contribution Plans (Schedule Of Actuarially Estimated Effect Of Future Medicare Subsidies And The Actual Subsidies Received) (Details) (Other Postretirement [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Medicare subsidies received	$ 4,395	$ 3,310
Entergy Arkansas [Member]
Medicare subsidies received	980	737
Entergy Gulf States Louisiana [Member]
Medicare subsidies received	520	410
Entergy Louisiana [Member]
Medicare subsidies received	654	513
Entergy Mississippi [Member]
Medicare subsidies received	322	245
Entergy New Orleans [Member]
Medicare subsidies received	222	194
Entergy Texas [Member]
Medicare subsidies received	440	334
System Energy [Member]
Medicare subsidies received	$ 152	$ 105