Retirement, Other Postretirement Benefits, And Defined Contribution Plans (Schedule Of Accumulated Benefit Obligations) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Qualified Pension Plans [Member]
Accumulated pension benefit obligation	$ 7,800,000	$ 6,900,000
Non-Qualified Pension Plans [Member]
Accumulated pension benefit obligation	143,400	131,900
Entergy Arkansas [Member] | Qualified Pension Plans [Member]
Accumulated pension benefit obligation	1,519,998	1,362,425
Entergy Arkansas [Member] | Non-Qualified Pension Plans [Member]
Accumulated pension benefit obligation	2,248	2,519
Entergy Louisiana [Member] | Qualified Pension Plans [Member]
Accumulated pension benefit obligation	1,643,759	1,481,158
Entergy Louisiana [Member] | Non-Qualified Pension Plans [Member]
Accumulated pension benefit obligation	1,682	1,881
Entergy Mississippi [Member] | Qualified Pension Plans [Member]
Accumulated pension benefit obligation	438,817	387,635
Entergy Mississippi [Member] | Non-Qualified Pension Plans [Member]
Accumulated pension benefit obligation	2,938	2,427
Entergy New Orleans [Member] | Qualified Pension Plans [Member]
Accumulated pension benefit obligation	192,561	179,907
Entergy New Orleans [Member] | Non-Qualified Pension Plans [Member]
Accumulated pension benefit obligation	230	206
Entergy Texas [Member] | Qualified Pension Plans [Member]
Accumulated pension benefit obligation	371,589	347,852
Entergy Texas [Member] | Non-Qualified Pension Plans [Member]
Accumulated pension benefit obligation	7,391	7,724
System Energy [Member] | Qualified Pension Plans [Member]
Accumulated pension benefit obligation	$ 368,771	$ 317,848