Consolidated Statements Of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	$ 10,878,673	$ 11,009,452	$ 11,074,481
Operation and Maintenance:
Fuel, fuel-related expenses, and gas purchased for resale	2,029,638	2,147,793	1,991,589
Nuclear refueling outage expenses	204,927	153,826	168,151
Operation and maintenance expense	3,272,381	3,346,397	3,306,694
Asset Impairment Charges	290,027	532,321	538,372
Decommissioning	400,802	388,508	405,685
Taxes, Other	643,745	641,952	617,556
Other Depreciation and Amortization	1,480,016	1,369,442	1,389,978
Other regulatory charges (credits) - net	(26,220)	301,049	(131,901)
Costs and Expenses	9,488,176	10,540,087	9,714,074
OPERATING INCOME	1,390,497	469,365	1,360,407
OTHER INCOME
Allowance for equity funds used during construction	144,974	129,602	95,088
Investment Income, Net	547,912	63,864	288,197
Miscellaneous - net	(252,539)	(129,754)	(113,426)
TOTAL	440,347	63,712	269,859
INTEREST EXPENSE
Interest expense	807,382	768,322	707,212
Allowance for borrowed funds used during construction	(64,957)	(60,974)	(44,869)
TOTAL	742,425	707,348	662,343
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	1,088,419	(174,271)	967,923
Income Tax Expense (Benefit)	(169,825)	(1,036,826)	542,570
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	1,258,244	862,555	425,353
Noncontrolling Interest in Net Income (Loss) Preferred Unit Holders, Redeemable	17,018	13,894	13,741
Net Income (Loss) Available to Common Stockholders, Basic	$ 1,241,226	$ 848,661	$ 411,612
Earnings per average common share:
Basic (in usd per share)	$ 6.36	$ 4.68	$ 2.29
Diluted (in usd per share)	$ 6.30	$ 4.63	$ 2.28
Basic average number of common shares outstanding	195,195,858	181,409,597	179,671,797
Diluted average number of common shares outstanding	196,999,284	183,378,513	180,535,893
Electricity [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	$ 9,429,978	$ 9,384,111	$ 9,278,895
Natural Gas, US Regulated [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	153,954	156,436	138,856
Competitive Businesses [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	1,294,741	1,468,905	1,656,730
Electricity, Purchased [Member]
Operation and Maintenance:
Cost of Goods and Services Sold	1,192,860	1,658,799	1,427,950
Entergy Arkansas [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	2,259,594	2,060,643
Operation and Maintenance:
Fuel, fuel-related expenses, and gas purchased for resale	458,907	517,245	402,777
Nuclear refueling outage expenses	68,769	77,915	83,968
Operation and maintenance expense	720,217	724,831	694,157
Decommissioning	68,030	60,420	56,860
Taxes, Other	115,869	104,771	103,662
Other Depreciation and Amortization	307,351	292,649	277,146
Other regulatory charges (credits) - net	(11,186)	(14,807)	(16,074)
Costs and Expenses	1,932,597	2,015,414	1,833,148
OPERATING INCOME	326,997	45,229	306,771
OTHER INCOME
Allowance for equity funds used during construction	15,499	16,557	18,452
Investment Income, Net	26,020	25,406	35,882
Miscellaneous - net	(18,566)	(14,874)	(13,967)
TOTAL	22,953	27,089	40,367
INTEREST EXPENSE
Interest expense	140,087	124,459	122,075
Allowance for borrowed funds used during construction	(6,332)	(7,781)	(8,585)
TOTAL	133,755	116,678	113,490
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	216,195	(44,360)	233,648
Income Tax Expense (Benefit)	(46,769)	(297,067)	93,804
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	262,964	252,707	139,844
Noncontrolling Interest in Net Income (Loss) Preferred Unit Holders, Redeemable	0	1,249	1,428
Net Income (Loss) Available to Common Stockholders, Basic	262,964	251,458	138,416
Entergy Arkansas [Member] | Electricity [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	2,259,594	2,060,643	2,139,919
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	204,640	252,390	230,652
Entergy Louisiana [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	4,285,175	4,296,320	4,300,550
Operation and Maintenance:
Fuel, fuel-related expenses, and gas purchased for resale	845,108	915,410	912,060
Nuclear refueling outage expenses	54,170	51,626	52,074
Operation and maintenance expense	994,637	959,185	941,604
Decommissioning	59,346	53,736	49,457
Taxes, Other	194,222	183,745	175,359
Other Depreciation and Amortization	535,791	492,179	467,369
Other regulatory charges (credits) - net	(105,203)	4,396	(152,080)
Costs and Expenses	3,388,533	3,620,549	3,425,913
OPERATING INCOME	896,642	675,771	874,637
OTHER INCOME
Allowance for equity funds used during construction	74,023	79,922	51,485
Investment Income, Net	231,985	141,882	164,550
Miscellaneous - net	(115,427)	(27,530)	(39,756)
TOTAL	190,581	194,274	176,279
INTEREST EXPENSE
Interest expense	309,493	288,658	275,185
Allowance for borrowed funds used during construction	(35,430)	(39,616)	(25,914)
TOTAL	274,063	249,042	249,271
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	813,160	621,003	801,645
Income Tax Expense (Benefit)	121,623	(54,611)	485,298
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	691,537	675,614	316,347
Net Income (Loss) Available to Common Stockholders, Basic	691,537	675,614	316,347
Entergy Louisiana [Member] | Electricity [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	4,223,027	4,232,541	4,246,020
Entergy Louisiana [Member] | Natural Gas, US Regulated [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	62,148	63,779	54,530
Entergy Louisiana [Member] | Electricity, Purchased [Member]
Operation and Maintenance:
Cost of Goods and Services Sold	810,462	960,272	980,070
Entergy Mississippi [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	1,323,043	1,335,112
Operation and Maintenance:
Fuel, fuel-related expenses, and gas purchased for resale	277,425	260,198	185,816
Operation and maintenance expense	266,175	261,613	240,738
Taxes, Other	105,318	101,999	95,051
Other Depreciation and Amortization	170,886	152,577	143,479
Other regulatory charges (credits) - net	14,993	147,704	(19,134)
Costs and Expenses	1,119,289	1,288,666	974,413
OPERATING INCOME	203,754	46,446	223,816
OTHER INCOME
Allowance for equity funds used during construction	8,356	8,710	9,667
Investment Income, Net	1,412	135	85
Miscellaneous - net	(4,478)	(2,732)	(2,232)
TOTAL	5,290	6,113	7,520
INTEREST EXPENSE
Interest expense	61,785	55,905	51,260
Allowance for borrowed funds used during construction	(3,532)	(3,651)	(3,875)
TOTAL	58,253	52,254	47,385
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	150,791	305	183,951
Income Tax Expense (Benefit)	30,866	(125,773)	73,919
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	119,925	126,078	110,032
Noncontrolling Interest in Net Income (Loss) Preferred Unit Holders, Redeemable	0	834	953
Net Income (Loss) Available to Common Stockholders, Basic	119,925	125,244	109,079
Entergy Mississippi [Member] | Electricity [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	1,323,043	1,335,112	1,198,229
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	284,492	364,575	328,463
Entergy New Orleans [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	686,223	717,390	716,070
Operation and Maintenance:
Fuel, fuel-related expenses, and gas purchased for resale	105,217	114,787	111,082
Operation and maintenance expense	121,057	124,293	107,977
Taxes, Other	55,270	56,141	54,590
Other Depreciation and Amortization	56,072	55,930	52,945
Other regulatory charges (credits) - net	21,616	21,413	10,889
Costs and Expenses	617,538	643,198	619,661
OPERATING INCOME	68,685	74,192	96,409
OTHER INCOME
Allowance for equity funds used during construction	9,941	5,941	2,418
Investment Income, Net	428	604	707
Miscellaneous - net	(6,038)	(10,444)	(1,269)
TOTAL	4,331	(3,899)	1,856
INTEREST EXPENSE
Interest expense	24,463	21,772	21,281
Allowance for borrowed funds used during construction	(4,262)	(2,195)	(847)
TOTAL	20,201	19,577	20,434
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	52,815	50,716	77,831
Income Tax Expense (Benefit)	186	(2,436)	33,278
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	52,629	53,152	44,553
Noncontrolling Interest in Net Income (Loss) Preferred Unit Holders, Redeemable	0	0	841
Net Income (Loss) Available to Common Stockholders, Basic	52,629	53,152	43,712
Entergy New Orleans [Member] | Electricity [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	594,417	624,733	631,744
Entergy New Orleans [Member] | Natural Gas, US Regulated [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	91,806	92,657	84,326
Entergy New Orleans [Member] | Electricity, Purchased [Member]
Operation and Maintenance:
Cost of Goods and Services Sold	258,306	270,634	282,178
Entergy Texas [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	1,488,955	1,605,902
Operation and Maintenance:
Fuel, fuel-related expenses, and gas purchased for resale	162,544	204,830	225,517
Operation and maintenance expense	258,924	238,400	230,437
Taxes, Other	76,366	82,033	79,254
Other Depreciation and Amortization	153,286	128,534	117,520
Other regulatory charges (credits) - net	88,770	131,667	82,328
Costs and Expenses	1,342,453	1,399,476	1,345,335
OPERATING INCOME	146,502	206,426	199,558
OTHER INCOME
Allowance for equity funds used during construction	28,445	9,723	6,722
Investment Income, Net	3,072	2,188	981
Miscellaneous - net	546	(655)	14
TOTAL	32,063	11,256	7,717
INTEREST EXPENSE
Interest expense	86,333	87,203	86,719
Allowance for borrowed funds used during construction	(13,269)	(5,513)	(4,098)
TOTAL	73,064	81,690	82,621
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	105,501	135,992	124,654
Income Tax Expense (Benefit)	(53,896)	(26,243)	48,481
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	159,397	162,235	76,173
Noncontrolling Interest in Net Income (Loss) Preferred Unit Holders, Redeemable	580	0	0
Net Income (Loss) Available to Common Stockholders, Basic	158,817	162,235	76,173
Entergy Texas [Member] | Electricity [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	1,488,955	1,605,902	1,544,893
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	602,563	614,012	610,279
System Energy [Member]
Operation and Maintenance:
Fuel, fuel-related expenses, and gas purchased for resale	82,438	64,778	71,700
Nuclear refueling outage expenses	33,376	20,715	17,968
Operation and maintenance expense	206,444	196,505	207,344
Decommissioning	35,729	34,336	43,347
Taxes, Other	29,018	28,090	26,180
Other Depreciation and Amortization	106,630	97,527	137,767
Other regulatory charges (credits) - net	(35,210)	(28,924)	(37,831)
Costs and Expenses	458,425	413,027	466,475
OPERATING INCOME	114,985	43,680	166,983
OTHER INCOME
Allowance for equity funds used during construction	8,709	8,750	6,345
Investment Income, Net	29,488	35,985	17,538
Miscellaneous - net	(5,516)	(5,775)	(6,711)
TOTAL	32,681	38,960	17,172
INTEREST EXPENSE
Interest expense	35,328	38,424	37,141
Allowance for borrowed funds used during construction	(2,131)	(2,218)	(1,551)
TOTAL	33,197	36,206	35,590
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	114,469	46,434	148,565
Income Tax Expense (Benefit)	15,349	(47,675)	69,969
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	99,120	94,109	78,596
Net Income (Loss) Available to Common Stockholders, Basic	99,120	94,109	78,596
System Energy [Member] | Electricity [Member]
REVENUES
Revenue from Contract with Customer, Excluding Assessed Tax	$ 573,410	$ 456,707	$ 633,458