Retirement, Other Postretirement Benefits, And Defined Contribution Plans (Schedule Of Accumulated Benefit Obligations) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Non-Qualified Pension Plans [Member]
Accumulated Pension Benefit Obligation	$ 137,600	$ 130,600
Qualified Pension Plans [Member]
Accumulated Pension Benefit Obligation	6,300,000	6,600,000
Entergy Arkansas [Member] | Non-Qualified Pension Plans [Member]
Accumulated Pension Benefit Obligation	4,495	4,086
Entergy Arkansas [Member] | Qualified Pension Plans [Member]
Accumulated Pension Benefit Obligation	1,309,903	1,379,108
Entergy Louisiana [Member] | Non-Qualified Pension Plans [Member]
Accumulated Pension Benefit Obligation	2,538	2,824
Entergy Louisiana [Member] | Qualified Pension Plans [Member]
Accumulated Pension Benefit Obligation	1,436,535	1,523,691
Entergy Mississippi [Member] | Non-Qualified Pension Plans [Member]
Accumulated Pension Benefit Obligation	1,802	1,761
Entergy Mississippi [Member] | Qualified Pension Plans [Member]
Accumulated Pension Benefit Obligation	379,775	399,300
Entergy New Orleans [Member] | Non-Qualified Pension Plans [Member]
Accumulated Pension Benefit Obligation	417	436
Entergy New Orleans [Member] | Qualified Pension Plans [Member]
Accumulated Pension Benefit Obligation	176,692	186,473
Entergy Texas [Member] | Non-Qualified Pension Plans [Member]
Accumulated Pension Benefit Obligation	8,460	9,215
Entergy Texas [Member] | Qualified Pension Plans [Member]
Accumulated Pension Benefit Obligation	359,687	391,296
System Energy [Member] | Qualified Pension Plans [Member]
Accumulated Pension Benefit Obligation	$ 286,917	$ 305,556