Consolidated Statements Of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	$ 10,113,636	$ 10,878,673	$ 11,009,452
Operation and Maintenance:
Fuel, fuel-related expenses, and gas purchased for resale	1,564,371	2,029,638	2,147,793
Nuclear refueling outage expenses	184,157	204,927	153,826
Operation and maintenance expense	3,002,626	3,272,381	3,346,397
Asset Impairment Charges	26,623	290,027	532,321
Decommissioning	381,861	400,802	388,508
Taxes, Other	652,840	643,745	641,952
Other Depreciation and Amortization	1,613,086	1,480,016	1,369,442
Other regulatory charges (credits) - net	14,609	(26,220)	301,049
Costs and Expenses	8,344,441	9,488,176	10,540,087
Operating income (loss)	1,769,195	1,390,497	469,365
OTHER INCOME
Allowance for equity funds used during construction	119,430	144,974	129,602
Investment Income, Net	392,818	547,912	63,864
Miscellaneous - net	(210,633)	(252,539)	(129,754)
TOTAL	301,615	440,347	63,712
INTEREST EXPENSE
Interest expense	837,981	807,382	768,322
Allowance for borrowed funds used during construction	(52,318)	(64,957)	(60,974)
TOTAL	785,663	742,425	707,348
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	1,285,147	1,088,419	(174,271)
Income Tax Expense (Benefit)	(121,506)	(169,825)	(1,036,826)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	1,406,653	1,258,244	862,555
Noncontrolling Interest in Net Income (Loss) Preferred Unit Holders, Redeemable	18,319	17,018	13,894
Net Income (Loss) Available to Common Stockholders, Basic	$ 1,388,334	$ 1,241,226	$ 848,661
Earnings per average common share:
Basic (in usd per share)	$ 6.94	$ 6.36	$ 4.68
Diluted (in usd per share)	$ 6.90	$ 6.30	$ 4.63
Basic average number of common shares outstanding	200,106,945	195,195,858	181,409,597
Diluted average number of common shares outstanding	201,102,220	196,999,284	183,378,513
Electricity [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	$ 9,046,643	$ 9,429,978	$ 9,384,111
Natural Gas, US Regulated [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	124,008	153,954	156,436
Competitive Businesses [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	942,985	1,294,741	1,468,905
Electricity, Purchased [Member]
Operation and Maintenance:
Cost of Goods and Services Sold	904,268	1,192,860	1,658,799
Entergy Arkansas [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	2,084,494	2,259,594
Operation and Maintenance:
Fuel, fuel-related expenses, and gas purchased for resale	271,896	458,907	517,245
Nuclear refueling outage expenses	55,737	68,769	77,915
Operation and maintenance expense	669,518	720,217	724,831
Decommissioning	73,319	68,030	60,420
Taxes, Other	121,057	115,869	104,771
Other Depreciation and Amortization	338,029	307,351	292,649
Other regulatory charges (credits) - net	(35,310)	(11,186)	(14,807)
Costs and Expenses	1,681,936	1,932,597	2,015,414
Operating income (loss)	402,558	326,997	45,229
OTHER INCOME
Allowance for equity funds used during construction	15,019	15,499	16,557
Investment Income, Net	35,579	26,020	25,406
Miscellaneous - net	(21,908)	(18,566)	(14,874)
TOTAL	28,690	22,953	27,089
INTEREST EXPENSE
Interest expense	144,834	140,087	124,459
Allowance for borrowed funds used during construction	(6,595)	(6,332)	(7,781)
TOTAL	138,239	133,755	116,678
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	293,009	216,195	(44,360)
Income Tax Expense (Benefit)	47,777	(46,769)	(297,067)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	245,232	262,964	252,707
Noncontrolling Interest in Net Income (Loss) Preferred Unit Holders, Redeemable	0	0	1,249
Net Income (Loss) Available to Common Stockholders, Basic	245,232	262,964	251,458
Entergy Arkansas [Member] | Electricity [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	2,084,494	2,259,594	2,060,643
Entergy Arkansas [Member] | Natural Gas, US Regulated [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	0	0
Entergy Arkansas [Member] | Electricity, Purchased [Member]
Operation and Maintenance:
Cost of Goods and Services Sold	187,690	204,640	252,390
Entergy Louisiana [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	4,069,862	4,285,175	4,296,320
Operation and Maintenance:
Fuel, fuel-related expenses, and gas purchased for resale	700,152	845,108	915,410
Nuclear refueling outage expenses	55,305	54,170	51,626
Operation and maintenance expense	969,630	994,637	959,185
Decommissioning	65,225	59,346	53,736
Taxes, Other	208,902	194,222	183,745
Other Depreciation and Amortization	609,931	535,791	492,179
Other regulatory charges (credits) - net	(584)	(105,203)	4,396
Costs and Expenses	3,205,041	3,388,533	3,620,549
Operating income (loss)	864,821	896,642	675,771
OTHER INCOME
Allowance for equity funds used during construction	38,151	74,023	79,922
Investment Income, Net	225,627	231,985	141,882
Miscellaneous - net	(116,366)	(115,427)	(27,530)
TOTAL	147,412	190,581	194,274
INTEREST EXPENSE
Interest expense	331,352	309,493	288,658
Allowance for borrowed funds used during construction	(19,147)	(35,430)	(39,616)
TOTAL	312,205	274,063	249,042
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	700,028	813,160	621,003
Income Tax Expense (Benefit)	(382,324)	121,623	(54,611)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	1,082,352	691,537	675,614
Net Income (Loss) Available to Common Stockholders, Basic	1,082,352	691,537	675,614
Entergy Louisiana [Member] | Electricity [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	4,019,063	4,223,027	4,232,541
Entergy Louisiana [Member] | Natural Gas, US Regulated [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	50,799	62,148	63,779
Entergy Louisiana [Member] | Electricity, Purchased [Member]
Operation and Maintenance:
Cost of Goods and Services Sold	596,480	810,462	960,272
Entergy Mississippi [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	1,247,854	1,323,043
Operation and Maintenance:
Fuel, fuel-related expenses, and gas purchased for resale	187,087	277,425	260,198
Operation and maintenance expense	288,543	266,175	261,613
Taxes, Other	101,525	105,318	101,999
Other Depreciation and Amortization	209,252	170,886	152,577
Other regulatory charges (credits) - net	(15,219)	14,993	147,704
Costs and Expenses	1,011,659	1,119,289	1,288,666
Operating income (loss)	236,195	203,754	46,446
OTHER INCOME
Allowance for equity funds used during construction	6,726	8,356	8,710
Investment Income, Net	272	1,412	135
Miscellaneous - net	(9,253)	(4,478)	(2,732)
TOTAL	(2,255)	5,290	6,113
INTEREST EXPENSE
Interest expense	68,945	61,785	55,905
Allowance for borrowed funds used during construction	(2,778)	(3,532)	(3,651)
TOTAL	66,167	58,253	52,254
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	167,773	150,791	305
Income Tax Expense (Benefit)	27,190	30,866	(125,773)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	140,583	119,925	126,078
Noncontrolling Interest in Net Income (Loss) Preferred Unit Holders, Redeemable	0	0	834
Net Income (Loss) Available to Common Stockholders, Basic	140,583	119,925	125,244
Entergy Mississippi [Member] | Electricity [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	1,247,854	1,323,043	1,335,112
Entergy Mississippi [Member] | Natural Gas, US Regulated [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	0	0
Entergy Mississippi [Member] | Electricity, Purchased [Member]
Operation and Maintenance:
Cost of Goods and Services Sold	240,471	284,492	364,575
Entergy New Orleans [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	633,841	686,223	717,390
Operation and Maintenance:
Fuel, fuel-related expenses, and gas purchased for resale	76,781	105,217	114,787
Operation and maintenance expense	125,756	121,057	124,293
Taxes, Other	57,454	55,270	56,141
Other Depreciation and Amortization	64,012	56,072	55,930
Other regulatory charges (credits) - net	1,854	21,616	21,413
Costs and Expenses	569,429	617,538	643,198
Operating income (loss)	64,412	68,685	74,192
OTHER INCOME
Allowance for equity funds used during construction	6,339	9,941	5,941
Investment Income, Net	120	428	604
Miscellaneous - net	316	(6,038)	(10,444)
TOTAL	6,775	4,331	(3,899)
INTEREST EXPENSE
Interest expense	29,105	24,463	21,772
Allowance for borrowed funds used during construction	(3,049)	(4,262)	(2,195)
TOTAL	26,056	20,201	19,577
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	45,131	52,815	50,716
Income Tax Expense (Benefit)	(4,207)	186	(2,436)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	49,338	52,629	53,152
Entergy New Orleans [Member] | Electricity [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	560,632	594,417	624,733
Entergy New Orleans [Member] | Natural Gas, US Regulated [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	73,209	91,806	92,657
Entergy New Orleans [Member] | Electricity, Purchased [Member]
Operation and Maintenance:
Cost of Goods and Services Sold	243,572	258,306	270,634
Entergy Texas [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	1,587,125	1,488,955
Operation and Maintenance:
Fuel, fuel-related expenses, and gas purchased for resale	238,428	162,544	204,830
Operation and maintenance expense	250,170	258,924	238,400
Taxes, Other	72,909	76,366	82,033
Other Depreciation and Amortization	177,738	153,286	128,534
Other regulatory charges (credits) - net	90,398	88,770	131,667
Costs and Expenses	1,340,276	1,342,453	1,399,476
Operating income (loss)	246,849	146,502	206,426
OTHER INCOME
Allowance for equity funds used during construction	44,073	28,445	9,723
Investment Income, Net	1,201	3,072	2,188
Miscellaneous - net	(28)	546	(655)
TOTAL	45,246	32,063	11,256
INTEREST EXPENSE
Interest expense	92,920	86,333	87,203
Allowance for borrowed funds used during construction	(18,940)	(13,269)	(5,513)
TOTAL	73,980	73,064	81,690
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	218,115	105,501	135,992
Income Tax Expense (Benefit)	3,042	(53,896)	(26,243)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	215,073	159,397	162,235
Noncontrolling Interest in Net Income (Loss) Preferred Unit Holders, Redeemable	1,882	580	0
Net Income (Loss) Available to Common Stockholders, Basic	213,191	158,817	162,235
Entergy Texas [Member] | Electricity [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	1,587,125	1,488,955	1,605,902
Entergy Texas [Member] | Natural Gas, US Regulated [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	0	0
Entergy Texas [Member] | Electricity, Purchased [Member]
Operation and Maintenance:
Cost of Goods and Services Sold	510,633	602,563	614,012
System Energy [Member]
Operation and Maintenance:
Fuel, fuel-related expenses, and gas purchased for resale	23,026	82,438	64,778
Nuclear refueling outage expenses	27,737	33,376	20,715
Operation and maintenance expense	178,249	206,444	196,505
Decommissioning	37,181	35,729	34,336
Taxes, Other	28,657	29,018	28,090
Other Depreciation and Amortization	110,395	106,630	97,527
Other regulatory charges (credits) - net	(26,531)	(35,210)	(28,924)
Costs and Expenses	378,714	458,425	413,027
Operating income (loss)	116,744	114,985	43,680
OTHER INCOME
Allowance for equity funds used during construction	9,122	8,709	8,750
Investment Income, Net	36,478	29,488	35,985
Miscellaneous - net	(10,012)	(5,516)	(5,775)
TOTAL	35,588	32,681	38,960
INTEREST EXPENSE
Interest expense	34,467	35,328	38,424
Allowance for borrowed funds used during construction	(1,809)	(2,131)	(2,218)
TOTAL	32,658	33,197	36,206
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	119,674	114,469	46,434
Income Tax Expense (Benefit)	20,543	15,349	(47,675)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	99,131	99,120	94,109
Net Income (Loss) Available to Common Stockholders, Basic	99,131	99,120	94,109
System Energy [Member] | Electricity [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	$ 495,458	$ 573,410	$ 456,707