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	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Medicare subsidies received	$ 3,175	$ 4,395
Entergy Arkansas [Member]
Medicare subsidies received	619	980
Entergy Louisiana [Member]
Medicare subsidies received	825	1,174
Entergy Mississippi [Member]
Medicare subsidies received	206	322
Entergy New Orleans [Member]
Medicare subsidies received	137	222
Entergy Texas [Member]
Medicare subsidies received	306	440
System Energy [Member]
Medicare subsidies received	$ 118	$ 152