Retirement, Other Postretirement Benefits, And Defined Contribution Plans Schedule Of Accumulated Benefit Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Qualified Pension Plans [Member]
Accumulated pension benefit obligation	$ 8,400,000	$ 7,800,000
Non-Qualified Pension Plans [Member]
Accumulated pension benefit obligation	161,300	143,400
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment	(128,837)	0
Entergy Arkansas [Member] | Qualified Pension Plans [Member]
Accumulated pension benefit obligation	1,617,858	1,519,998
Entergy Arkansas [Member] | Non-Qualified Pension Plans [Member]
Accumulated pension benefit obligation	2,626	2,248
Entergy Arkansas [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment	12,320
Entergy Louisiana [Member] | Qualified Pension Plans [Member]
Accumulated pension benefit obligation	1,753,980	1,643,759
Entergy Louisiana [Member] | Non-Qualified Pension Plans [Member]
Accumulated pension benefit obligation	1,802	1,682
Entergy Louisiana [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment	(23,508)
Entergy Mississippi [Member] | Qualified Pension Plans [Member]
Accumulated pension benefit obligation	466,497	438,817
Entergy Mississippi [Member] | Non-Qualified Pension Plans [Member]
Accumulated pension benefit obligation	3,345	2,938
Entergy Mississippi [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment	(4,428)
Entergy New Orleans [Member] | Qualified Pension Plans [Member]
Accumulated pension benefit obligation	201,159	192,561
Entergy New Orleans [Member] | Non-Qualified Pension Plans [Member]
Accumulated pension benefit obligation	240	230
Entergy New Orleans [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment	(5,493)
Entergy Texas [Member] | Qualified Pension Plans [Member]
Accumulated pension benefit obligation	379,050	371,589
Entergy Texas [Member] | Non-Qualified Pension Plans [Member]
Accumulated pension benefit obligation	7,949	7,391
Entergy Texas [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment	(22,441)
System Energy [Member] | Qualified Pension Plans [Member]
Accumulated pension benefit obligation	410,296	$ 368,771
System Energy [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment	$ (1,963)