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, 2016	Dec. 31, 2015
Medicare subsidies received	$ 455	$ 3,175
Entergy Arkansas [Member]
Medicare subsidies received	79	619
Entergy Louisiana [Member]
Medicare subsidies received	114	825
Entergy Mississippi [Member]
Medicare subsidies received	24	206
Entergy New Orleans [Member]
Medicare subsidies received	16	137
Entergy Texas [Member]
Medicare subsidies received	35	306
System Energy [Member]
Medicare subsidies received	$ 21	$ 118