Retirement And Other Postretirement Benefits (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Entergy Arkansas [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year		$ 54,468		$ 54,468
Defined Benefit Plan, Plan Assets, Contributions by Employer				54,468
Entergy Louisiana [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year		44,565		44,565
Defined Benefit Plan, Plan Assets, Contributions by Employer				44,565
Entergy Mississippi [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year		21,110		21,110
Defined Benefit Plan, Plan Assets, Contributions by Employer				21,110
Entergy New Orleans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year		1,420		1,420
Defined Benefit Plan, Plan Assets, Contributions by Employer				1,420
Entergy Texas [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year		5,314		5,314
Defined Benefit Plan, Plan Assets, Contributions by Employer				5,314
Difference between rate case pension amounts and actuarially determined pension amounts		39,300		39,300
System Energy [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year		15,543		15,543
Defined Benefit Plan, Plan Assets, Contributions by Employer				15,543
Subsequent Event [Member] | Entergy Arkansas [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 0
Subsequent Event [Member] | Entergy Louisiana [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Plan Assets, Contributions by Employer	0
Subsequent Event [Member] | Entergy Mississippi [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Plan Assets, Contributions by Employer	0
Subsequent Event [Member] | Entergy New Orleans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Plan Assets, Contributions by Employer	0
Subsequent Event [Member] | Entergy Texas [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Plan Assets, Contributions by Employer	0
Subsequent Event [Member] | System Energy [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 0
Non Qualified Pension Plans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Net other postretirement benefit cost		21,800	$ 5,900	39,800	$ 23,300
Defined Benefit Plan, Plan Assets, Payment for Settlement		18,000	1,400	27,300	9,200
Non Qualified Pension Plans [Member] | Entergy Arkansas [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Net other postretirement benefit cost		63	69	575	212
Defined Benefit Plan, Plan Assets, Payment for Settlement				379
Non Qualified Pension Plans [Member] | Entergy Louisiana [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Net other postretirement benefit cost		24	24	76	77
Non Qualified Pension Plans [Member] | Entergy Mississippi [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Net other postretirement benefit cost		85	80	724	241
Defined Benefit Plan, Plan Assets, Payment for Settlement				453	2
Non Qualified Pension Plans [Member] | Entergy New Orleans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Net other postretirement benefit cost		33	28	99	84
Non Qualified Pension Plans [Member] | Entergy Texas [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Net other postretirement benefit cost		63	961	190	1,264
Defined Benefit Plan, Plan Assets, Payment for Settlement			886		1,000
Pension Plans Defined Benefit [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Plan Assets, Contributions by Employer				267,000
Net other postretirement benefit cost		29,495	162,291	225,716	273,676
Defined Benefit Plan, Benefit Obligation, Payment for Settlement		(6,914)	(125,548)	(152,588)	(148,201)
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year		267,000		267,000
Pension Plans Defined Benefit [Member] | Entergy Arkansas [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Net other postretirement benefit cost		6,736	21,033	45,079	53,160
Defined Benefit Plan, Benefit Obligation, Payment for Settlement		(558)	(11,477)	(24,516)	(22,973)
Pension Plans Defined Benefit [Member] | Entergy Louisiana [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Net other postretirement benefit cost		7,488	43,861	60,477	70,355
Defined Benefit Plan, Benefit Obligation, Payment for Settlement		(561)	(33,507)	(38,791)	(37,968)
Pension Plans Defined Benefit [Member] | Entergy Mississippi [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Net other postretirement benefit cost		2,288	10,124	18,596	19,074
Defined Benefit Plan, Benefit Obligation, Payment for Settlement		(345)	(6,853)	(12,088)	(9,061)
Pension Plans Defined Benefit [Member] | Entergy New Orleans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Net other postretirement benefit cost		657	5,181	3,139	6,669
Defined Benefit Plan, Benefit Obligation, Payment for Settlement		(248)	(4,402)	(1,948)	(4,402)
Pension Plans Defined Benefit [Member] | Entergy Texas [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Net other postretirement benefit cost		1,705	14,897	14,450	20,172
Defined Benefit Plan, Benefit Obligation, Payment for Settlement		(632)	(13,082)	(10,902)	(15,547)
Pension Plans Defined Benefit [Member] | System Energy [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Net other postretirement benefit cost		1,889	7,498	10,750	15,527
Defined Benefit Plan, Benefit Obligation, Payment for Settlement		$ (228)	$ (4,593)	$ (5,518)	$ (6,616)