Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	May 01, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Cash and cash equivalents:
Cash	$ 44,215		$ 128,851
Temporary cash investments	955,821		1,630,248
Total cash and cash equivalents	1,000,036		1,759,099	$ 1,239,664	$ 425,722
Securitization recovery trust account	28,000		42,000
Accounts receivable:
Customer	981,996		833,478
Allowance for doubtful accounts	(96,087)		(117,794)
Other	159,252		135,208
Accrued unbilled revenues	485,648		434,835
Total accounts receivable	1,530,809		1,285,727
Deferred Fuel Cost	209,853		4,380
Fuel inventory - at average cost	125,983		172,934
Public Utilities, Inventory	1,032,260		962,185
Deferred nuclear refueling outage costs	140,642		179,150
Prepaid Expense and Other Assets, Current	193,084		196,424
TOTAL	4,232,667		4,559,899
OTHER PROPERTY AND INVESTMENTS
Decommissioning trust funds	5,235,496		7,253,215
Non-utility property - at cost (less accumulated depreciation)	352,706		343,328
Other	123,720		214,222
TOTAL	5,711,922		7,810,765
PROPERTY, PLANT, AND EQUIPMENT
Electric	61,608,960		59,696,443
Natural gas	642,708		610,768
Construction work in progress	2,912,379		2,012,030
Nuclear fuel	534,169		601,281
TOTAL PROPERTY, PLANT, AND EQUIPMENT	65,698,216		62,920,522
Less - accumulated depreciation and amortization	24,509,241		24,067,745
PROPERTY, PLANT, AND EQUIPMENT - NET	41,188,975		38,852,777
Regulatory assets:
Other regulatory assets	6,707,721		6,076,549
Deferred Fuel Cost Non Current	240,820		240,422
Goodwill	377,172		377,172
Deferred Income Tax Assets, Net	58,069		76,289
Other	326,153		245,339
Deferred Costs and Other Assets	7,709,935		7,015,771
TOTAL ASSETS	58,843,499		58,239,212
CURRENT LIABILITIES
Currently maturing long-term debt	770,329		1,164,015
Short-term borrowings	1,006,321		1,627,489
Accounts payable	3,452,217		2,739,437
Taxes Payable, Current	460,622		441,011
Interest accrued	231,104		201,791
Deferred fuel costs	2,150		153,113
Pension and other postretirement liabilities	67,361		61,815
Current portion of regulatory liability for income taxes - net related to unprotected ADIT	69,768		63,683
Other	194,605		206,640
TOTAL	6,644,900		7,060,506
NON-CURRENT LIABILITIES
Deferred Income Tax Liabilities, Net	4,555,119		4,361,772
Accumulated deferred investment tax credits	213,768		212,494
Regulatory liability for income taxes - net	1,396,385		1,521,757
Other regulatory liabilities	2,560,439		2,323,851
Decommissioning and asset retirement cost liabilities	4,696,558		6,469,452
Loss Contingency Accrual	170,258		242,835
Pension and other postretirement liabilities	2,425,439		2,853,013
Long-term debt	23,846,675		21,205,761
Deferred Credits and Other Liabilities	827,024		807,219
TOTAL	$ 40,691,665		$ 39,998,154
Common Stock, Shares, Issued	270,300,648		270,035,180
Subsidiaries' preferred stock without sinking fund	$ 219,410		$ 219,410
Preferred Stock, Shares Issued	0		0
Proceeds from Issuance of Preferred Stock and Preference Stock	$ 0		$ 0
Preferred Stock, Shares Authorized	1,000,000	1,000,000	0
Common Shareholders' Equity:
Common Stock, Value, Issued	$ 2,703		$ 2,700
Additional Paid in Capital, Common Stock	6,577,852		6,549,923
Accumulated other comprehensive loss	$ (472,039)		$ (449,207)	(390,420)	(446,920)
Treasury Stock, Shares	69,325,211		69,790,346
Less - treasury stock, at cost	$ 5,040,637		$ 5,074,456
TOTAL	11,252,524		10,926,142
Stockholders' Equity Attributable to Noncontrolling Interest	35,000		35,000
Retained Earnings (Accumulated Deficit)	10,184,645		9,897,182
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	11,287,524		10,961,142	10,806,839	10,258,675
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	58,843,499		58,239,212
Long-term Transition Bond, Noncurrent	$ 89,665		$ 174,635
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01	$ 0.01
Securitized Regulatory Transition Assets, Noncurrent	$ 63,783		$ 119,238
Contract with Customer, Liability, Current	$ 390,423		$ 401,512
Common Stock, Shares Authorized	499,000,000	499,000,000	500,000,000
Entergy Arkansas [Member]
Cash and cash equivalents:
Cash	$ 867		$ 24,108
Temporary cash investments	96,470		168,020
Total cash and cash equivalents	97,337		192,128	597,904	3,519
Accounts receivable:
Customer	235,409		183,719
Allowance for doubtful accounts	(18,997)		(18,334)
Associated companies	52,447		34,216
Other	55,837		35,845
Accrued unbilled revenues	131,016		109,000
Total accounts receivable	455,712		344,446
Deferred Fuel Cost	59,541		0
Fuel inventory - at average cost	17,290		43,811
Public Utilities, Inventory	246,719		237,640
Deferred nuclear refueling outage costs	45,525		32,692
Prepaid Expense and Other Assets, Current	15,434		13,296
TOTAL	937,558		864,013
OTHER PROPERTY AND INVESTMENTS
Decommissioning trust funds	1,376,256		1,273,921
Other	338		341
TOTAL	1,376,594		1,274,262
PROPERTY, PLANT, AND EQUIPMENT
Electric	13,135,507		12,905,322
Construction work in progress	401,058		234,213
Nuclear fuel	166,440		163,044
TOTAL PROPERTY, PLANT, AND EQUIPMENT	13,703,005		13,302,579
Less - accumulated depreciation and amortization	5,449,425		5,255,355
PROPERTY, PLANT, AND EQUIPMENT - NET	8,253,580		8,047,224
Regulatory assets:
Other regulatory assets	1,758,362		1,832,384
Deferred Fuel Cost Non Current	68,618		68,220
Other	17,513		14,028
Deferred Costs and Other Assets	1,844,493		1,914,632
TOTAL ASSETS	12,412,225		12,100,131
CURRENT LIABILITIES
Currently maturing long-term debt	0		485,000
Associated companies accounts payable	67,547		59,448
Accounts payable	209,269		208,591
Taxes Payable, Current	61,938		81,837
Interest accrued	48,361		22,745
Deferred fuel costs	0		53,065
Other	45,930		40,628
TOTAL	524,620		1,049,820
NON-CURRENT LIABILITIES
Deferred Income Tax Liabilities, Net	1,406,576		1,286,123
Accumulated deferred investment tax credits	29,599		30,500
Regulatory liability for income taxes - net	441,555		467,031
Other regulatory liabilities	666,287		686,872
Decommissioning and asset retirement cost liabilities	1,372,007		1,314,160
Loss Contingency Accrual	68,903		70,169
Pension and other postretirement liabilities	279,615		361,682
Long-term debt	3,959,194		3,482,507
Deferred Credits and Other Liabilities	108,179		75,098
TOTAL	8,331,915		7,774,142
Common Shareholders' Equity:
Members' Equity	3,555,690		3,276,169
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	3,555,690		3,276,169	3,341,545	3,125,937
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	12,412,225		12,100,131
Contract with Customer, Liability, Current	91,575		98,506
Entergy Louisiana [Member]
Cash and cash equivalents:
Cash	401		1,303
Temporary cash investments	266,292		726,717
Total cash and cash equivalents	266,693		728,020	252,163	2,006
Securitization recovery trust account	5,500		2,700
Accounts receivable:
Customer	380,218		317,905
Allowance for doubtful accounts	(38,103)		(45,693)
Associated companies	95,988		81,624
Other	42,341		41,760
Accrued unbilled revenues	192,398		178,840
Total accounts receivable	672,842		574,436
Deferred Fuel Cost	52,036		2,250
Fuel inventory - at average cost	44,917		50,680
Public Utilities, Inventory	463,854		437,933
Deferred nuclear refueling outage costs	50,004		48,407
Prepaid Expense and Other Assets, Current	51,239		36,813
TOTAL	1,601,585		1,878,539
Investments in and Advances to Affiliates, at Fair Value	1,390,587		1,390,587
OTHER PROPERTY AND INVESTMENTS
Decommissioning trust funds	1,987,336		1,794,042
Non-utility property - at cost (less accumulated depreciation)	332,838		323,110
Other	13,622		13,399
TOTAL	3,724,383		3,521,138
PROPERTY, PLANT, AND EQUIPMENT
Electric	26,433,677		25,619,789
Natural gas	277,164		262,744
Construction work in progress	1,908,777		667,281
Nuclear fuel	208,699		210,128
TOTAL PROPERTY, PLANT, AND EQUIPMENT	28,828,317		26,759,942
Less - accumulated depreciation and amortization	9,735,089		9,372,224
PROPERTY, PLANT, AND EQUIPMENT - NET	19,093,228		17,387,718
Regulatory assets:
Other regulatory assets	2,664,712		1,726,066
Deferred Fuel Cost Non Current	168,122		168,122
Other	39,938		23,924
Deferred Costs and Other Assets	2,872,772		1,918,112
TOTAL ASSETS	27,291,968		24,705,507
CURRENT LIABILITIES
Currently maturing long-term debt	0		240,000
Associated companies accounts payable	124,691		103,148
Accounts payable	2,411,444		1,450,008
Taxes Payable, Current	137,368		42,617
Interest accrued	96,713		92,249
Current portion of regulatory liability for income taxes - net related to unprotected ADIT	33,400		31,138
Other	61,681		62,968
TOTAL	3,016,123		2,174,740
NON-CURRENT LIABILITIES
Deferred Income Tax Liabilities, Net	2,307,263		2,138,522
Accumulated deferred investment tax credits	103,770		107,317
Regulatory liability for income taxes - net	410,807		447,628
Other regulatory liabilities	1,044,990		918,293
Decommissioning and asset retirement cost liabilities	1,632,846		1,573,307
Loss Contingency Accrual	24,175		24,939
Pension and other postretirement liabilities	624,645		692,728
Long-term debt	9,813,493		8,787,451
Deferred Credits and Other Liabilities	381,129		382,894
TOTAL	16,343,118		15,073,079
Common Shareholders' Equity:
Accumulated other comprehensive loss	4,377		4,327
Members' Equity	7,928,350		7,453,361
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	7,932,727		7,457,688	6,966,630	6,397,118
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	27,291,968		24,705,507
Long-term Transition Bond, Noncurrent	0		10,278
Securitized Regulatory Transition Assets, Noncurrent	0		5,088
Contract with Customer, Liability, Current	150,826		152,612
Entergy Mississippi [Member]
Cash and cash equivalents:
Cash	26		11
Temporary cash investments	2		7
Total cash and cash equivalents	28		18	43,038	51,601
Accounts receivable:
Customer	115,831		105,732
Allowance for doubtful accounts	(11,350)		(19,527)
Associated companies	12,111		2,740
Other	13,689		11,821
Accrued unbilled revenues	66,753		59,514
Total accounts receivable	197,034		160,280
Deferred Fuel Cost	80,619		0
Fuel inventory - at average cost	11,553		17,117
Public Utilities, Inventory	72,082		59,542
Prepaid Expense and Other Assets, Current	28,940		4,876
TOTAL	390,256		241,833
OTHER PROPERTY AND INVESTMENTS
Non-utility property - at cost (less accumulated depreciation)	4,531		4,543
Escrow accounts	48,884		64,635
TOTAL	53,415		69,178
PROPERTY, PLANT, AND EQUIPMENT
Electric	6,377,803		6,084,730
Construction work in progress	202,495		134,854
TOTAL PROPERTY, PLANT, AND EQUIPMENT	6,580,298		6,219,584
Less - accumulated depreciation and amortization	2,102,072		2,005,087
PROPERTY, PLANT, AND EQUIPMENT - NET	4,478,226		4,214,497
Regulatory assets:
Other regulatory assets	482,707		467,341
Other	17,927		14,413
Deferred Costs and Other Assets	500,634		481,754
TOTAL ASSETS	5,422,531		5,007,262
CURRENT LIABILITIES
Associated companies accounts payable	80,597		61,727
Accounts payable	148,077		117,629
Taxes Payable, Current	77,203		108,084
Interest accrued	25,521		20,889
Deferred fuel costs	0		14,691
Other	22,591		34,270
TOTAL	439,986		443,490
NON-CURRENT LIABILITIES
Deferred Income Tax Liabilities, Net	704,405		646,674
Accumulated deferred investment tax credits	10,969		9,062
Regulatory liability for income taxes - net	216,620		224,000
Other regulatory liabilities	72,244		15,828
Decommissioning and asset retirement cost liabilities	10,174		9,762
Loss Contingency Accrual	38,417		46,504
Pension and other postretirement liabilities	93,275		110,901
Long-term debt	1,981,945		1,780,577
Deferred Credits and Other Liabilities	41,779		47,730
TOTAL	3,169,828		2,891,038
Common Shareholders' Equity:
Members' Equity	1,812,717		1,672,734
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,812,717		1,672,734	1,654,659	1,542,151
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	5,422,531		5,007,262
Contract with Customer, Liability, Current	85,997		86,200
Entergy New Orleans [Member]
Cash and cash equivalents:
Cash	26		26
Temporary cash investments	26,362		0
Total cash and cash equivalents	26,388		26	32	6,017
Securitization recovery trust account	5,744		3,364
Accounts receivable:
Customer	96,185		70,694
Allowance for doubtful accounts	(18,625)		(17,430)
Associated companies	4,288		2,381
Other	10,457		4,248
Accrued unbilled revenues	25,611		31,069
Total accounts receivable	117,916		90,962
Deferred Fuel Cost	0		2,130
Fuel inventory - at average cost	1,899		1,978
Public Utilities, Inventory	16,392		16,550
Prepaid Expense and Other Assets, Current	11,438		3,715
TOTAL	179,777		118,725
OTHER PROPERTY AND INVESTMENTS
Non-utility property - at cost (less accumulated depreciation)	1,016		1,016
Storm Reserve Escrow Account	0		83,038
TOTAL	1,016		84,054
PROPERTY, PLANT, AND EQUIPMENT
Electric	1,834,801		1,821,638
Natural gas	365,544		348,024
Construction work in progress	108,818		12,460
TOTAL PROPERTY, PLANT, AND EQUIPMENT	2,309,163		2,182,122
Less - accumulated depreciation and amortization	764,178		740,796
PROPERTY, PLANT, AND EQUIPMENT - NET	1,544,985		1,441,326
Regulatory assets:
Other regulatory assets	248,378		266,790
Deferred Fuel Cost Non Current	4,080		4,080
Other	37,254		23,931
Deferred Costs and Other Assets	289,712		294,801
TOTAL ASSETS	2,015,490		1,938,906
CURRENT LIABILITIES
Currently maturing long-term debt	70,000		0
Notes Payable, Related Parties, Current	1,618		1,618
Associated companies accounts payable	51,071		54,234
Accounts payable	137,011		60,766
Taxes Payable, Current	3,001		4,700
Interest accrued	5,299		8,095
Deferred fuel costs	2,150		0
Current portion of regulatory liability for income taxes - net related to unprotected ADIT	3,177		3,296
Other	6,094		5,462
TOTAL	307,354		166,083
NON-CURRENT LIABILITIES
Deferred Income Tax Liabilities, Net	351,119		338,714
Accumulated deferred investment tax credits	16,053		16,095
Regulatory liability for income taxes - net	53,688		55,675
Decommissioning and asset retirement cost liabilities	3,964		3,768
Loss Contingency Accrual	27,605		89,898
Long-term debt	579,550		629,704
Notes Payable, Related Parties, Noncurrent	10,911		10,911
Deferred Credits and Other Liabilities	35,932		21,141
TOTAL	1,078,822		1,165,906
Common Shareholders' Equity:
Members' Equity	629,314		606,917
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	629,314		606,917	533,144	497,579
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	2,015,490		1,938,906
Long-term Transition Bond, Noncurrent	35,724		41,291
Securitized Regulatory Transition Assets, Noncurrent	27,995		35,559
Contract with Customer, Liability, Current	27,933		27,912
Entergy Texas [Member]
Cash and cash equivalents:
Cash	25		26
Temporary cash investments	0		248,570
Total cash and cash equivalents	25		248,596	34	12,929
Securitization recovery trust account	17,176		36,233
Accounts receivable:
Customer	115,016		103,221
Allowance for doubtful accounts	(9,013)		(16,810)
Associated companies	23,175		18,892
Other	20,383		11,780
Accrued unbilled revenues	69,870		56,411
Total accounts receivable	219,431		173,494
Deferred Fuel Cost	17,657		0
Fuel inventory - at average cost	46,299		53,531
Public Utilities, Inventory	75,584		56,227
Prepaid Expense and Other Assets, Current	23,736		20,165
TOTAL	399,908		588,246
OTHER PROPERTY AND INVESTMENTS
Investment in affiliates - at equity	312		349
Non-utility property - at cost (less accumulated depreciation)	376		376
Other	17,936		19,889
TOTAL	18,624		20,614
PROPERTY, PLANT, AND EQUIPMENT
Electric	7,044,218		6,007,687
Construction work in progress	158,458		879,908
TOTAL PROPERTY, PLANT, AND EQUIPMENT	7,202,676		6,887,595
Less - accumulated depreciation and amortization	2,017,029		1,864,494
PROPERTY, PLANT, AND EQUIPMENT - NET	5,185,647		5,023,101
Regulatory assets:
Other regulatory assets	451,953		524,713
Other	85,261		70,397
Deferred Costs and Other Assets	537,214		595,110
TOTAL ASSETS	6,141,393		6,227,071
CURRENT LIABILITIES
Currently maturing long-term debt	0		200,000
Associated companies accounts payable	70,050		55,944
Accounts payable	173,719		350,947
Taxes Payable, Current	58,441		52,438
Interest accrued	8,048		20,856
Deferred fuel costs	0		85,356
Current portion of regulatory liability for income taxes - net related to unprotected ADIT	33,192		29,249
Other	18,201		12,370
TOTAL	395,743		843,442
NON-CURRENT LIABILITIES
Deferred Income Tax Liabilities, Net	676,521		639,422
Accumulated deferred investment tax credits	9,479		9,942
Regulatory liability for income taxes - net	142,539		175,594
Other regulatory liabilities	39,940		32,297
Decommissioning and asset retirement cost liabilities	8,403		8,063
Loss Contingency Accrual	8,449		8,382
Long-term debt	2,353,742		2,293,708
Deferred Credits and Other Liabilities	75,721		58,643
TOTAL	$ 3,314,794		$ 3,226,051
Common Stock, Shares, Outstanding	46,525,000		46,525,000
Common Stock, Shares, Issued	46,525,000		46,525,000
Common Shareholders' Equity:
Common Stock, Value, Issued	$ 49,452		$ 49,452
Additional Paid in Capital, Common Stock	1,040,162		955,162
TOTAL	2,395,856		2,122,578
Stockholders' Equity Attributable to Noncontrolling Interest	35,000		35,000
Retained Earnings (Accumulated Deficit)	1,306,242		1,117,964
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	2,430,856		2,157,578	2,144,715	1,799,407
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	6,141,393		6,227,071
Long-term Transition Bond, Noncurrent	53,941		123,066
Securitized Regulatory Transition Assets, Noncurrent	35,886		78,590
Contract with Customer, Liability, Current	$ 34,092		$ 36,282
Common Stock, Shares Authorized	200,000,000		200,000,000
System Energy [Member]
Cash and cash equivalents:
Cash	$ 106		$ 26,086
Temporary cash investments	163,036		216,383
Total cash and cash equivalents	163,142		242,469	11,931	68,534
Accounts receivable:
Associated companies	68,737		57,743
Other	5,106		2,550
Total accounts receivable	73,843		60,293
Public Utilities, Inventory	139,702		123,006
Deferred nuclear refueling outage costs	15,289		34,459
Prepaid Expense and Other Assets, Current	4,200		6,864
TOTAL	396,176		467,091
OTHER PROPERTY AND INVESTMENTS
Decommissioning trust funds	1,310,462		1,215,868
TOTAL	1,310,462		1,215,868
PROPERTY, PLANT, AND EQUIPMENT
Electric	5,324,544		5,309,458
Construction work in progress	97,655		59,831
Nuclear fuel	134,880		175,005
TOTAL PROPERTY, PLANT, AND EQUIPMENT	5,557,079		5,544,294
Less - accumulated depreciation and amortization	3,374,953		3,355,367
PROPERTY, PLANT, AND EQUIPMENT - NET	2,182,126		2,188,927
Regulatory assets:
Other regulatory assets	467,477		538,963
Other	2,183		3,119
Deferred Costs and Other Assets	469,660		542,082
TOTAL ASSETS	4,358,424		4,413,968
CURRENT LIABILITIES
Currently maturing long-term debt	50,329		100,015
Associated companies accounts payable	17,011		15,309
Accounts payable	40,780		41,313
Taxes Payable, Current	47,914		82,977
Interest accrued	11,165		12,722
Other	4,243		4,248
TOTAL	171,442		256,584
NON-CURRENT LIABILITIES
Deferred Income Tax Liabilities, Net	371,438		359,835
Accumulated deferred investment tax credits	43,323		38,902
Regulatory liability for income taxes - net	131,176		151,829
Other regulatory liabilities	717,958		665,396
Decommissioning and asset retirement cost liabilities	997,785		968,910
Pension and other postretirement liabilities	104,691		125,412
Long-term debt	695,443		705,259
Deferred Credits and Other Liabilities	36,929		61,295
TOTAL	$ 3,098,743		$ 3,076,838
Common Stock, Shares, Outstanding	789,350		789,350
Common Stock, Shares, Issued	789,350		789,350
Common Shareholders' Equity:
Common Stock, Value, Issued	$ 951,850		$ 951,850
Retained Earnings (Accumulated Deficit)	136,389		128,696
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,088,239		1,080,546	$ 719,983	$ 712,068
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 4,358,424		$ 4,413,968
Common Stock, Shares Authorized	1,000,000		1,000,000