Rate And Regulatory Matters (Details Of Other Regulatory Assets Included In Entergy Corporation And Subsidiaries) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	$ 6,076,549	$ 5,292,055
Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	1,832,384	1,666,850
Regulatory Assets	212,600	168,900
Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	1,726,066	1,315,211
Regulatory Assets	302,500
Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	467,341	377,972
Regulatory Assets	107,300	80,800
Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	266,790	259,363
Regulatory Assets	63,200	52,900
Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	524,713	512,648
Regulatory Assets	115,300	42,500
System Energy [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	538,963	490,083
Regulatory Assets	92,900	75,900
Asset Retirement Obligation [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	1,018,900	920,400
Asset Retirement Obligation [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	479,300	433,000
Asset Retirement Obligation [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	299,000	262,500
Asset Retirement Obligation [Member] | Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	7,900	7,800
Asset Retirement Obligation [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	5,200	4,900
Asset Retirement Obligation [Member] | System Energy [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	226,300	210,900
Algiers customer migration costs [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	3,900	4,900
Pension And Post Retirement Costs [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	3,027,500	2,942,400
Pension And Post Retirement Costs [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	831,500	796,500
Pension And Post Retirement Costs [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	799,400	787,700
Pension And Post Retirement Costs [Member] | Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	242,700	234,400
Pension And Post Retirement Costs [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	75,700	85,900
Pension And Post Retirement Costs [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	140,100	167,700
Pension And Post Retirement Costs [Member] | System Energy [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	217,800	200,300
Provision For Storm Damages, Including Hurricane Costs [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	379,200	372,800
Provision For Storm Damages, Including Hurricane Costs [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	42,700	46,100
Provision For Storm Damages, Including Hurricane Costs [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	94,000	45,700
Provision For Storm Damages, Including Hurricane Costs [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	55,200	59,600
Provision For Storm Damages, Including Hurricane Costs [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	187,300	221,400
Removal Costs [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	893,800	421,000
Removal Costs [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	212,600	168,900
Removal Costs [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	302,500	0
Removal Costs [Member] | Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	107,300	80,800
Removal Costs [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	63,200	52,900
Removal Costs [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	115,300	42,500
Removal Costs [Member] | System Energy [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	92,900	75,900
Attorney General Litigation Costs [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	25,300	29,500
Attorney General Litigation Costs [Member] | Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	25,300	29,500
River Bend AFUDC [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	7,200	9,100
Business Combination External Costs Deferral [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	9,200	10,800
Nuclear Generation Development Costs [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	14,200	21,600
Nuclear Generation Development Costs [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	14,000	21,200
Rate Case Costs [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	5,700	7,000
Little Gypsy Cost Proceeding [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	7,500	29,900
Little Gypsy Cost Proceeding [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	5,100	27,600
Transition to Competition Costs [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	2,100	14,900
Neches and Sabine Costs [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	18,800	21,200
Regulatory Clause Revenues, under-recovered [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	66,000	15,700
Regulatory Clause Revenues, under-recovered [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	12,600	2,300
Regulatory Clause Revenues, under-recovered [Member] | Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	44,300	7,500
Unamortized Loss on Reacquired Debt [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	79,200	66,600
Unamortized Loss on Reacquired Debt [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	24,700	18,300
Unamortized Loss on Reacquired Debt [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	26,600	20,400
Unamortized Loss on Reacquired Debt [Member] | Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	13,500	14,900
Unamortized Loss on Reacquired Debt [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	1,900	2,300
Unamortized Loss on Reacquired Debt [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	10,500	7,700
Unamortized Loss on Reacquired Debt [Member] | System Energy [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	2,000	3,000
ANO Fukushima and Flood Barrier costs [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	9,100	10,900
Opportunity Sales [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	131,800	116,300
Opportunity Sales [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	131,800	116,300	$ 116,000
Retired electric meters [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	46,900	50,400
Retired electric meters [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	96,400	101,100
Retired electric meters [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	26,000	28,400
Other Regulatory Assets (Liabilities) [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	135,300	150,300
Other Regulatory Assets (Liabilities) [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	30,700	24,200
Other Regulatory Assets (Liabilities) [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	23,900	29,100
Other Regulatory Assets (Liabilities) [Member] | Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	7,100	3,100
Other Regulatory Assets (Liabilities) [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	15,000	17,300
Other Regulatory Assets (Liabilities) [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	11,700	8,800
Retired electric and gas meters [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	192,100	205,600
Retired electric and gas meters [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	21,700	24,600
Deferred COVID-19 costs
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	105,700	0
Deferred COVID-19 costs | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	10,500	0
Deferred COVID-19 costs | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	48,800	0
Deferred COVID-19 costs | Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	19,200	0
Deferred COVID-19 costs | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	14,300	0
Deferred COVID-19 costs | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	12,900	0
New Orleans Power Station deferral | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	$ 5,000	$ 0