Retirement And Other Postretirement Benefits (Components Of Qualified Net Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Pension Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	$ 45,241	$ 40,379
Interest cost on projected benefit obligation	46,099	60,799
Expected return on assets	(105,713)	(103,565)
Amortization of loss	104,392	87,259
Net other postretirement benefit cost	90,019	84,872
Pension Plans Defined Benefit [Member] | Entergy Arkansas [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	7,418	6,566
Interest cost on projected benefit obligation	8,341	11,433
Expected return on assets	(19,670)	(19,622)
Amortization of loss	19,303	16,897
Net other postretirement benefit cost	15,392	15,274
Pension Plans Defined Benefit [Member] | Entergy Louisiana [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	10,043	8,794
Interest cost on projected benefit obligation	9,562	12,841
Expected return on assets	(22,538)	(22,402)
Amortization of loss	19,204	16,627
Net other postretirement benefit cost	16,271	15,860
Pension Plans Defined Benefit [Member] | Entergy Mississippi [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	2,364	2,023
Interest cost on projected benefit obligation	2,462	3,340
Expected return on assets	(5,587)	(5,757)
Amortization of loss	5,668	4,748
Net other postretirement benefit cost	4,907	4,354
Pension Plans Defined Benefit [Member] | Entergy New Orleans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	796	663
Interest cost on projected benefit obligation	1,029	1,456
Expected return on assets	(2,622)	(2,627)
Amortization of loss	2,270	2,005
Net other postretirement benefit cost	1,473	1,497
Pension Plans Defined Benefit [Member] | Entergy Texas [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	1,801	1,546
Interest cost on projected benefit obligation	1,949	2,782
Expected return on assets	(5,237)	(5,486)
Amortization of loss	3,711	3,265
Net other postretirement benefit cost	2,224	2,107
Pension Plans Defined Benefit [Member] | System Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	2,314	1,965
Interest cost on projected benefit obligation	2,142	2,814
Expected return on assets	(4,778)	(4,663)
Amortization of loss	5,326	4,279
Net other postretirement benefit cost	5,004	4,395
Other Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	6,645	5,801
Interest cost on projected benefit obligation	5,320	7,932
Expected return on assets	(10,805)	(10,328)
Amortization of prior service cost (credit)	(8,267)	(5,922)
Amortization of loss	713	468
Net other postretirement benefit cost	(6,394)	(2,049)
Other Postretirement [Member] | Entergy Arkansas [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	1,034	828
Interest cost on projected benefit obligation	932	1,217
Expected return on assets	(4,505)	(4,326)
Amortization of prior service cost (credit)	(280)	(661)
Amortization of loss	49	55
Net other postretirement benefit cost	(2,770)	(2,887)
Other Postretirement [Member] | Entergy Louisiana [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	1,544	1,423
Interest cost on projected benefit obligation	1,130	1,723
Expected return on assets	0	0
Amortization of prior service cost (credit)	(1,230)	(1,089)
Amortization of loss	(91)	(199)
Net other postretirement benefit cost	1,353	1,858
Other Postretirement [Member] | Entergy Mississippi [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	362	351
Interest cost on projected benefit obligation	278	422
Expected return on assets	(1,384)	(1,307)
Amortization of prior service cost (credit)	(444)	(321)
Amortization of loss	19	29
Net other postretirement benefit cost	(1,169)	(826)
Other Postretirement [Member] | Entergy New Orleans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	109	105
Interest cost on projected benefit obligation	130	227
Expected return on assets	(1,438)	(1,355)
Amortization of prior service cost (credit)	(229)	(76)
Amortization of loss	(178)	(38)
Net other postretirement benefit cost	(1,606)	(1,137)
Other Postretirement [Member] | Entergy Texas [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	346	303
Interest cost on projected benefit obligation	317	582
Expected return on assets	(2,548)	(2,435)
Amortization of prior service cost (credit)	(936)	(550)
Amortization of loss	100	212
Net other postretirement benefit cost	(2,721)	(1,888)
Other Postretirement [Member] | System Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	335	294
Interest cost on projected benefit obligation	220	307
Expected return on assets	(789)	(748)
Amortization of prior service cost (credit)	(109)	(219)
Amortization of loss	15	20
Net other postretirement benefit cost	(328)	(346)
Non Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net other postretirement benefit cost	4,600	4,500
Non Qualified Pension Plans [Member] | Entergy Arkansas [Member]
Defined Benefit Plan Disclosure [Line Items]
Net other postretirement benefit cost	90	83
Non Qualified Pension Plans [Member] | Entergy Louisiana [Member]
Defined Benefit Plan Disclosure [Line Items]
Net other postretirement benefit cost	44	37
Non Qualified Pension Plans [Member] | Entergy Mississippi [Member]
Defined Benefit Plan Disclosure [Line Items]
Net other postretirement benefit cost	96	90
Non Qualified Pension Plans [Member] | Entergy New Orleans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net other postretirement benefit cost	8	8
Non Qualified Pension Plans [Member] | Entergy Texas [Member]
Defined Benefit Plan Disclosure [Line Items]
Net other postretirement benefit cost	$ 115	$ 117