Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer, Excluding Assessed Tax	$ 2,844,838	$ 2,427,179
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	3,200	6,600
Accounts Receivable, Allowance for Credit Loss, Writeoff	(3,800)	(8,400)
Accounts Receivable, Allowance for Credit Loss, Recovery	1,900	2,900
Allowance for Doubtful Other Receivables, Current	119,000	8,500	$ 117,700	$ 7,400
Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	2,538,420	2,050,638
Natural Gas, US Regulated [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	58,168	43,976
Competitive Businesses [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	248,250	332,565
Residential [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	966,855	798,028
Commercial [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	572,676	538,940
Industrial [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	597,652	557,515
Governmental [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	56,798	52,582
Sales for Resale [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	205,075	53,725
Other Electric [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	80,261	50,166
Non-Customer [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	59,103	(318)
Non-Customer [Member] | Competitive Businesses [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	16,137	116,563
Competitive Business Sales [Member] | Competitive Businesses [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	232,113	216,002
Billed Retail [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	2,193,981	1,947,065
Customer | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	2,479,317	2,050,956
Entergy Arkansas [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	583,386	481,912
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	2,400	1,200
Accounts Receivable, Allowance for Credit Loss, Writeoff	(100)	(1,800)
Accounts Receivable, Allowance for Credit Loss, Recovery	600	900
Allowance for Doubtful Other Receivables, Current	21,200	1,500	18,300	1,200
Regulatory asset related to costs associated with COVID-19 pandemic	11,400
Entergy Arkansas [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	583,386	481,912
Entergy Arkansas [Member] | Natural Gas, US Regulated [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0
Entergy Arkansas [Member] | Residential [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	237,182	219,688
Entergy Arkansas [Member] | Commercial [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	106,416	111,245
Entergy Arkansas [Member] | Industrial [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	103,412	101,088
Entergy Arkansas [Member] | Governmental [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	4,256	4,030
Entergy Arkansas [Member] | Sales for Resale [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	110,085	41,140
Entergy Arkansas [Member] | Other Electric [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	19,583	1,596
Entergy Arkansas [Member] | Non-Customer [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	2,452	3,125
Entergy Arkansas [Member] | Billed Retail [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	451,266	436,051
Entergy Arkansas [Member] | Customer | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	580,934	478,787
Entergy Louisiana [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	1,107,644	930,647
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	2,300	3,000
Accounts Receivable, Allowance for Credit Loss, Writeoff	(2,100)	(3,500)
Accounts Receivable, Allowance for Credit Loss, Recovery	700	1,100
Allowance for Doubtful Other Receivables, Current	46,600	2,500	45,700	1,900
Regulatory asset related to costs associated with COVID-19 pandemic	47,800
Entergy Louisiana [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	1,079,663	912,541
Entergy Louisiana [Member] | Natural Gas, US Regulated [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	27,981	18,106
Entergy Louisiana [Member] | Residential [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	335,760	259,860
Entergy Louisiana [Member] | Commercial [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	224,649	202,246
Entergy Louisiana [Member] | Industrial [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	347,009	322,342
Entergy Louisiana [Member] | Governmental [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	18,616	16,754
Entergy Louisiana [Member] | Sales for Resale [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	80,428	78,530
Entergy Louisiana [Member] | Other Electric [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	43,910	32,008
Entergy Louisiana [Member] | Non-Customer [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	29,291	801
Entergy Louisiana [Member] | Billed Retail [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	926,034	801,202
Entergy Louisiana [Member] | Customer | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	1,050,372	911,740
Entergy Mississippi [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	336,619	293,922
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	(2,200)	900
Accounts Receivable, Allowance for Credit Loss, Writeoff	(800)	(1,200)
Accounts Receivable, Allowance for Credit Loss, Recovery	300	300
Allowance for Doubtful Other Receivables, Current	16,800	600	19,500	600
Regulatory asset related to costs associated with COVID-19 pandemic	16,300
Entergy Mississippi [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	336,619	293,922
Entergy Mississippi [Member] | Natural Gas, US Regulated [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0
Entergy Mississippi [Member] | Residential [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	147,636	127,102
Entergy Mississippi [Member] | Commercial [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	97,936	96,798
Entergy Mississippi [Member] | Industrial [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	33,980	36,390
Entergy Mississippi [Member] | Governmental [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	10,543	10,327
Entergy Mississippi [Member] | Sales for Resale [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	40,311	14,422
Entergy Mississippi [Member] | Other Electric [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	3,950	6,443
Entergy Mississippi [Member] | Non-Customer [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	2,263	2,440
Entergy Mississippi [Member] | Billed Retail [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	290,095	270,617
Entergy Mississippi [Member] | Customer | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	334,356	291,482
Entergy New Orleans [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	169,335	149,302
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	1,800	800
Accounts Receivable, Allowance for Credit Loss, Writeoff	0	(800)
Accounts Receivable, Allowance for Credit Loss, Recovery	200	200
Allowance for Doubtful Other Receivables, Current	19,400	3,400	17,400	3,200
Regulatory asset related to costs associated with COVID-19 pandemic	14,800
Entergy New Orleans [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	139,148	123,431
Entergy New Orleans [Member] | Natural Gas, US Regulated [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	30,187	25,871
Entergy New Orleans [Member] | Residential [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	66,427	50,899
Entergy New Orleans [Member] | Commercial [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	47,799	45,505
Entergy New Orleans [Member] | Industrial [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	6,789	7,347
Entergy New Orleans [Member] | Governmental [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	16,380	15,851
Entergy New Orleans [Member] | Sales for Resale [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	4,696	10,170
Entergy New Orleans [Member] | Other Electric [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	(3,359)	763
Entergy New Orleans [Member] | Non-Customer [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	416	(7,104)
Entergy New Orleans [Member] | Billed Retail [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	137,395	119,602
Entergy New Orleans [Member] | Customer | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	138,732	130,535
Entergy Texas [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	480,220	339,336
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	(1,100)	700
Accounts Receivable, Allowance for Credit Loss, Writeoff	(800)	(1,100)
Accounts Receivable, Allowance for Credit Loss, Recovery	100	500
Allowance for Doubtful Other Receivables, Current	15,000	600	$ 16,800	$ 500
Regulatory asset related to costs associated with COVID-19 pandemic	10,700
Entergy Texas [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	480,220	339,336
Entergy Texas [Member] | Natural Gas, US Regulated [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0
Entergy Texas [Member] | Residential [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	179,850	140,480
Entergy Texas [Member] | Commercial [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	95,876	83,146
Entergy Texas [Member] | Industrial [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	106,462	90,348
Entergy Texas [Member] | Governmental [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	7,003	5,620
Entergy Texas [Member] | Sales for Resale [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	74,073	8,629
Entergy Texas [Member] | Other Electric [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	17,529	10,702
Entergy Texas [Member] | Non-Customer [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	(573)	411
Entergy Texas [Member] | Billed Retail [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	389,191	319,594
Entergy Texas [Member] | Customer | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	480,793	338,925
System Energy [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 117,746	$ 130,664