Rate And Regulatory Matters (Details Of Other Regulatory Assets Included In Entergy Corporation And Subsidiaries) (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		$ 5,292,055	$ 4,746,496
Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		1,666,850	1,534,977
Regulatory Assets		168,900	138,300
Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		1,315,211	1,105,077
Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		377,972	343,049
Regulatory Assets		80,800	63,500
Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		259,363	229,796
Regulatory Assets		52,900	49,300
Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		512,648	598,048
Regulatory Assets		42,500	50,900
System Energy [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		490,083	446,371
Regulatory Assets		75,900	76,400
Asset Retirement Obligation [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	920,400	814,300
Asset Retirement Obligation [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	433,000	381,700
Asset Retirement Obligation [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	262,500	232,900
Asset Retirement Obligation [Member] | Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	7,800	7,200
Asset Retirement Obligation [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	4,900	4,500
Asset Retirement Obligation [Member] | System Energy [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	210,900	186,900
Algiers customer migration costs [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		4,900	0
Pension And Post Retirement Costs [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	2,942,400	2,611,500
Pension And Post Retirement Costs [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	796,500	747,200
Pension And Post Retirement Costs [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	787,700	711,800
Pension And Post Retirement Costs [Member] | Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	234,400	215,900
Pension And Post Retirement Costs [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	85,900	96,200
Pension And Post Retirement Costs [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	167,700	171,800
Pension And Post Retirement Costs [Member] | System Energy [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	200,300	179,300
Provision For Storm Damages, Including Hurricane Costs [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		372,800	452,700
Provision For Storm Damages, Including Hurricane Costs [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		46,100	60,700
Provision For Storm Damages, Including Hurricane Costs [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		45,700	17,900
Provision For Storm Damages, Including Hurricane Costs [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		59,600	70,400
Provision For Storm Damages, Including Hurricane Costs [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		221,400	303,600
Removal Costs [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		421,000	375,800
Removal Costs [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		168,900	138,300
Removal Costs [Member] | Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		80,800	63,500
Removal Costs [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		52,900	49,300
Removal Costs [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		42,500	50,900
Removal Costs [Member] | System Energy [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		75,900	76,400
Attorney General Litigation Costs [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[2]	29,500	23,600
Attorney General Litigation Costs [Member] | Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[2]	29,500	23,600
River Bend AFUDC [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		9,100	11,000
Business Combination External Costs Deferral [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[2]	10,800	12,400
Nuclear Generation Development Costs [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[2]	21,600	29,000
Nuclear Generation Development Costs [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[2]	21,200	28,500
Rate Case Costs [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		7,000	0
Little Gypsy Cost Proceeding [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		29,900	52,100
Little Gypsy Cost Proceeding [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		27,600	49,800
Transition to Competition Costs [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		14,900	26,700
Neches and Sabine Costs [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		21,200	23,600
Regulatory Clause Revenues, under-recovered [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		15,700	39,000
Regulatory Clause Revenues, under-recovered [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[2]	2,300	20,500
Regulatory Clause Revenues, under-recovered [Member] | Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		7,600	16,600
Unamortized Loss on Reacquired Debt [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		66,600	74,500
Unamortized Loss on Reacquired Debt [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		18,300	21,200
Unamortized Loss on Reacquired Debt [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		20,400	22,500
Unamortized Loss on Reacquired Debt [Member] | Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		14,900	16,200
Unamortized Loss on Reacquired Debt [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		2,300	2,600
Unamortized Loss on Reacquired Debt [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		7,700	8,200
Unamortized Loss on Reacquired Debt [Member] | System Energy [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		3,000	3,800
ANO Fukushima and Flood Barrier costs [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[2]	10,900	12,600
Opportunity Sales [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[2]	116,300	116,300
Opportunity Sales [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[2]	116,300	116,300
Retired electric meters [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		50,400	0
Retired electric meters [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	101,100	0
Retired electric meters [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		28,400	0
Other Regulatory Assets (Liabilities) [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		150,300	157,700
Other Regulatory Assets (Liabilities) [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		24,200	36,500
Other Regulatory Assets (Liabilities) [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		29,100	18,300
Other Regulatory Assets (Liabilities) [Member] | Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		3,000	0
Other Regulatory Assets (Liabilities) [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		7,300	6,800
Other Regulatory Assets (Liabilities) [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		8,800	13,200
Retired electric and gas meters [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		205,600	0
Retired electric and gas meters [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[2]	24,600	0
Retired plant costs [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		$ 10,000	$ 0

[1] (a) Does not earn a return on investment, but is offset by related liabilities.

[2] (b) Does not earn a return on investment.