Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	May 01, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Cash and cash equivalents:
Cash	$ 157,265		$ 128,851
Temporary cash investments	529,616		1,630,248
Total cash and cash equivalents	686,881		1,759,099	$ 935,468	$ 425,722
Securitization recovery trust account	33,000		42,000
Accounts receivable:
Customer	877,221		833,478
Allowance for doubtful accounts	(109,189)		(117,794)
Other	158,262		135,208
Accrued unbilled revenues	513,710		434,835
Total accounts receivable	1,440,004		1,285,727
Deferred Fuel Cost	152,230		4,380
Fuel inventory - at average cost	156,216		172,934
Public Utilities, Inventory	990,088		962,185
Deferred nuclear refueling outage costs	173,365		179,150
Prepaid Expense and Other Assets, Current	195,922		196,424
TOTAL	3,794,706		4,559,899
OTHER PROPERTY AND INVESTMENTS
Decommissioning trust funds	5,238,727		7,253,215
Non-utility property - at cost (less accumulated depreciation)	353,423		343,328
Other	156,766		214,222
TOTAL	5,748,916		7,810,765
PROPERTY, PLANT, AND EQUIPMENT
Electric	61,064,428		59,696,443
Natural gas	631,471		610,768
Construction work in progress	1,383,758		2,012,030
Nuclear fuel	549,166		601,281
TOTAL PROPERTY, PLANT, AND EQUIPMENT	63,628,823		62,920,522
Less - accumulated depreciation and amortization	24,197,413		24,067,745
PROPERTY, PLANT, AND EQUIPMENT - NET	39,431,410		38,852,777
Regulatory assets:
Other regulatory assets	5,982,773		6,076,549
Deferred Fuel Cost Non Current	240,688		240,422
Goodwill	377,172		377,172
Deferred Income Tax Assets, Net	60,749		76,289
Other	312,869		245,339
Deferred Costs and Other Assets	6,974,251		7,015,771
TOTAL ASSETS	55,949,283		58,239,212
CURRENT LIABILITIES
Currently maturing long-term debt	285,324		1,164,015
Short-term borrowings	866,245		1,627,489
Accounts payable	1,348,734		2,739,437
Taxes Payable, Current	371,300		441,011
Interest accrued	201,629		201,791
Deferred fuel costs	15,111		153,113
Pension and other postretirement liabilities	67,963		61,815
Current portion of regulatory liability for income taxes - net related to unprotected ADIT	64,288		63,683
Other	193,640		206,640
TOTAL	3,804,540		7,060,506
NON-CURRENT LIABILITIES
Deferred Income Tax Liabilities, Net	4,375,535		4,361,772
Accumulated deferred investment tax credits	215,828		212,494
Regulatory liability for income taxes - net	1,435,112		1,521,757
Other regulatory liabilities	2,580,823		2,323,851
Decommissioning and asset retirement cost liabilities	4,635,300		6,469,452
Loss Contingency Accrual	188,557		242,835
Pension and other postretirement liabilities	2,587,272		2,853,013
Long-term debt	24,211,966		21,205,761
Deferred Credits and Other Liabilities	771,993		807,219
TOTAL	$ 41,002,386		$ 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	6,561,676		6,549,923
Accumulated other comprehensive loss	$ (478,739)		$ (449,207)	(388,604)	(446,920)
Treasury Stock, Shares	69,347,286		69,790,346
Less - treasury stock, at cost	$ 5,042,242		$ 5,074,456
TOTAL	10,887,947		10,926,142
Stockholders' Equity Attributable to Noncontrolling Interest	35,000		35,000
Retained Earnings (Accumulated Deficit)	9,844,549		9,897,182
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	10,922,947		10,961,142	10,460,988	10,258,675
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	55,949,283		58,239,212
Long-term Transition Bond, Noncurrent	$ 113,572		$ 174,635
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01	$ 0.01
Securitized Regulatory Transition Assets, Noncurrent	$ 83,195		$ 119,238
Contract with Customer, Liability, Current	$ 390,306		$ 401,512
Common Stock, Shares Authorized	499,000,000	499,000,000	499,000,000
Entergy Arkansas [Member]
Cash and cash equivalents:
Cash	$ 108,882		$ 24,108
Temporary cash investments	16,244		168,020
Total cash and cash equivalents	125,126		192,128	2,573	3,519
Accounts receivable:
Customer	208,469		183,719
Allowance for doubtful accounts	(22,395)		(18,334)
Associated companies	48,646		34,216
Other	64,661		35,845
Accrued unbilled revenues	136,598		109,000
Total accounts receivable	435,979		344,446
Deferred Fuel Cost	21,527		0
Fuel inventory - at average cost	30,815		43,811
Public Utilities, Inventory	247,633		237,640
Deferred nuclear refueling outage costs	46,996		32,692
Prepaid Expense and Other Assets, Current	20,228		13,296
TOTAL	928,304		864,013
OTHER PROPERTY AND INVESTMENTS
Decommissioning trust funds	1,376,715		1,273,921
Other	339		341
TOTAL	1,377,054		1,274,262
PROPERTY, PLANT, AND EQUIPMENT
Electric	13,067,828		12,905,322
Construction work in progress	319,379		234,213
Nuclear fuel	156,819		163,044
TOTAL PROPERTY, PLANT, AND EQUIPMENT	13,544,026		13,302,579
Less - accumulated depreciation and amortization	5,384,637		5,255,355
PROPERTY, PLANT, AND EQUIPMENT - NET	8,159,389		8,047,224
Regulatory assets:
Other regulatory assets	1,799,547		1,832,384
Deferred Fuel Cost Non Current	68,485		68,220
Other	17,292		14,028
Deferred Costs and Other Assets	1,885,324		1,914,632
TOTAL ASSETS	12,350,071		12,100,131
CURRENT LIABILITIES
Currently maturing long-term debt	90,000		485,000
Associated companies accounts payable	94,710		59,448
Accounts payable	183,266		208,591
Taxes Payable, Current	75,308		81,837
Interest accrued	20,255		22,745
Deferred fuel costs	0		53,065
Other	41,682		40,628
TOTAL	597,695		1,049,820
NON-CURRENT LIABILITIES
Deferred Income Tax Liabilities, Net	1,346,301		1,286,123
Accumulated deferred investment tax credits	29,899		30,500
Regulatory liability for income taxes - net	446,059		467,031
Other regulatory liabilities	725,620		686,872
Decommissioning and asset retirement cost liabilities	1,352,440		1,314,160
Loss Contingency Accrual	64,047		70,169
Pension and other postretirement liabilities	314,639		361,682
Long-term debt	3,953,714		3,482,507
Deferred Credits and Other Liabilities	93,858		75,098
TOTAL	8,326,577		7,774,142
Common Shareholders' Equity:
Members' Equity	3,425,799		3,276,169
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	3,425,799		3,276,169	3,230,702	3,125,937
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	12,350,071		12,100,131
Contract with Customer, Liability, Current	92,474		98,506
Entergy Louisiana [Member]
Cash and cash equivalents:
Cash	231		1,303
Temporary cash investments	206,643		726,717
Total cash and cash equivalents	206,874		728,020	463,735	2,006
Securitization recovery trust account	3,700		2,700
Accounts receivable:
Customer	336,478		317,905
Allowance for doubtful accounts	(39,793)		(45,693)
Associated companies	191,251		81,624
Other	36,096		41,760
Accrued unbilled revenues	206,910		178,840
Total accounts receivable	730,942		574,436
Deferred Fuel Cost	98,679		2,250
Fuel inventory - at average cost	51,920		50,680
Public Utilities, Inventory	443,275		437,933
Deferred nuclear refueling outage costs	63,843		48,407
Prepaid Expense and Other Assets, Current	51,441		36,813
TOTAL	1,646,974		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	1,985,477		1,794,042
Non-utility property - at cost (less accumulated depreciation)	333,392		323,110
Other	13,500		13,399
TOTAL	3,722,956		3,521,138
PROPERTY, PLANT, AND EQUIPMENT
Electric	26,204,300		25,619,789
Natural gas	271,712		262,744
Construction work in progress	577,975		667,281
Nuclear fuel	224,870		210,128
TOTAL PROPERTY, PLANT, AND EQUIPMENT	27,278,857		26,759,942
Less - accumulated depreciation and amortization	9,610,279		9,372,224
PROPERTY, PLANT, AND EQUIPMENT - NET	17,668,578		17,387,718
Regulatory assets:
Other regulatory assets	1,851,005		1,726,066
Deferred Fuel Cost Non Current	168,122		168,122
Other	33,094		23,924
Deferred Costs and Other Assets	2,052,221		1,918,112
TOTAL ASSETS	25,090,729		24,705,507
CURRENT LIABILITIES
Currently maturing long-term debt	0		240,000
Associated companies accounts payable	116,333		103,148
Accounts payable	476,177		1,450,008
Taxes Payable, Current	97,467		42,617
Interest accrued	94,411		92,249
Current portion of regulatory liability for income taxes - net related to unprotected ADIT	31,138		31,138
Other	62,057		62,968
TOTAL	1,028,636		2,174,740
NON-CURRENT LIABILITIES
Deferred Income Tax Liabilities, Net	2,230,734		2,138,522
Accumulated deferred investment tax credits	104,953		107,317
Regulatory liability for income taxes - net	425,192		447,628
Other regulatory liabilities	1,028,552		918,293
Decommissioning and asset retirement cost liabilities	1,612,748		1,573,307
Loss Contingency Accrual	24,648		24,939
Pension and other postretirement liabilities	648,825		692,728
Long-term debt	9,836,133		8,787,451
Deferred Credits and Other Liabilities	381,914		382,894
TOTAL	16,293,699		15,073,079
Common Shareholders' Equity:
Accumulated other comprehensive loss	4,508		4,327
Members' Equity	7,763,886		7,453,361
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	7,768,394		7,457,688	6,748,972	6,397,118
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	25,090,729		24,705,507
Long-term Transition Bond, Noncurrent	0		10,278
Securitized Regulatory Transition Assets, Noncurrent	0		5,088
Contract with Customer, Liability, Current	151,053		152,612
Entergy Mississippi [Member]
Cash and cash equivalents:
Cash	11		11
Temporary cash investments	0		7
Total cash and cash equivalents	11		18	70,184	51,601
Accounts receivable:
Customer	91,479		105,732
Allowance for doubtful accounts	(13,646)		(19,527)
Associated companies	4,226		2,740
Other	15,985		11,821
Accrued unbilled revenues	71,400		59,514
Total accounts receivable	169,444		160,280
Deferred Fuel Cost	32,023		0
Fuel inventory - at average cost	16,163		17,117
Public Utilities, Inventory	65,915		59,542
Prepaid Expense and Other Assets, Current	22,447		4,876
TOTAL	306,003		241,833
OTHER PROPERTY AND INVESTMENTS
Non-utility property - at cost (less accumulated depreciation)	4,535		4,543
Escrow accounts	48,932		64,635
TOTAL	53,467		69,178
PROPERTY, PLANT, AND EQUIPMENT
Electric	6,275,518		6,084,730
Construction work in progress	172,783		134,854
TOTAL PROPERTY, PLANT, AND EQUIPMENT	6,448,301		6,219,584
Less - accumulated depreciation and amortization	2,068,644		2,005,087
PROPERTY, PLANT, AND EQUIPMENT - NET	4,379,657		4,214,497
Regulatory assets:
Other regulatory assets	480,391		467,341
Other	16,239		14,413
Deferred Costs and Other Assets	496,630		481,754
TOTAL ASSETS	5,235,757		5,007,262
CURRENT LIABILITIES
Associated companies accounts payable	64,309		61,727
Accounts payable	118,387		117,629
Taxes Payable, Current	58,646		108,084
Interest accrued	16,266		20,889
Deferred fuel costs	0		14,691
Other	23,075		34,270
TOTAL	366,711		443,490
NON-CURRENT LIABILITIES
Deferred Income Tax Liabilities, Net	680,901		646,674
Accumulated deferred investment tax credits	11,025		9,062
Regulatory liability for income taxes - net	219,343		224,000
Other regulatory liabilities	34,005		15,828
Decommissioning and asset retirement cost liabilities	10,035		9,762
Loss Contingency Accrual	38,644		46,504
Pension and other postretirement liabilities	100,700		110,901
Long-term debt	1,981,674		1,780,577
Deferred Credits and Other Liabilities	42,597		47,730
TOTAL	3,118,924		2,891,038
Common Shareholders' Equity:
Members' Equity	1,750,122		1,672,734
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,750,122		1,672,734	1,601,070	1,542,151
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	5,235,757		5,007,262
Contract with Customer, Liability, Current	86,028		86,200
Entergy New Orleans [Member]
Cash and cash equivalents:
Cash	26		26
Total cash and cash equivalents	26		26	30,745	6,017
Securitization recovery trust account	2,678		3,364
Accounts receivable:
Customer	86,901		70,694
Allowance for doubtful accounts	(21,132)		(17,430)
Associated companies	1,406		2,381
Other	8,944		4,248
Accrued unbilled revenues	30,149		31,069
Total accounts receivable	106,268		90,962
Deferred Fuel Cost	0		2,130
Fuel inventory - at average cost	1,253		1,978
Public Utilities, Inventory	16,034		16,550
Prepaid Expense and Other Assets, Current	16,257		3,715
TOTAL	142,516		118,725
OTHER PROPERTY AND INVESTMENTS
Non-utility property - at cost (less accumulated depreciation)	1,016		1,016
Storm Reserve Escrow Account	38,846		83,038
TOTAL	39,862		84,054
PROPERTY, PLANT, AND EQUIPMENT
Electric	1,825,128		1,821,638
Natural gas	359,759		348,024
Construction work in progress	29,053		12,460
TOTAL PROPERTY, PLANT, AND EQUIPMENT	2,213,940		2,182,122
Less - accumulated depreciation and amortization	755,956		740,796
PROPERTY, PLANT, AND EQUIPMENT - NET	1,457,984		1,441,326
Regulatory assets:
Other regulatory assets	231,752		266,790
Deferred Fuel Cost Non Current	4,080		4,080
Other	32,970		23,931
Deferred Costs and Other Assets	268,802		294,801
TOTAL ASSETS	1,909,164		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	77,066		54,234
Accounts payable	34,389		60,766
Taxes Payable, Current	5,648		4,700
Interest accrued	6,780		8,095
Deferred fuel costs	2,293		0
Current portion of regulatory liability for income taxes - net related to unprotected ADIT	3,295		3,296
Other	6,279		5,462
TOTAL	234,681		166,083
NON-CURRENT LIABILITIES
Deferred Income Tax Liabilities, Net	343,485		338,714
Accumulated deferred investment tax credits	16,067		16,095
Regulatory liability for income taxes - net	54,637		55,675
Decommissioning and asset retirement cost liabilities	3,898		3,768
Loss Contingency Accrual	49,746		89,898
Long-term debt	554,341		629,704
Notes Payable, Related Parties, Noncurrent	10,911		10,911
Deferred Credits and Other Liabilities	28,079		21,141
TOTAL	1,061,164		1,165,906
Common Shareholders' Equity:
Members' Equity	613,319		606,917
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	613,319		606,917	513,694	497,579
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	1,909,164		1,938,906
Long-term Transition Bond, Noncurrent	35,664		41,291
Securitized Regulatory Transition Assets, Noncurrent	30,995		35,559
Contract with Customer, Liability, Current	27,313		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	42,239	12,929
Securitization recovery trust account	26,278		36,233
Accounts receivable:
Customer	111,163		103,221
Allowance for doubtful accounts	(12,223)		(16,810)
Associated companies	17,494		18,892
Other	17,328		11,780
Accrued unbilled revenues	68,654		56,411
Total accounts receivable	202,416		173,494
Fuel inventory - at average cost	49,925		53,531
Public Utilities, Inventory	63,417		56,227
Prepaid Expense and Other Assets, Current	15,055		20,165
TOTAL	357,116		588,246
OTHER PROPERTY AND INVESTMENTS
Investment in affiliates - at equity	324		349
Non-utility property - at cost (less accumulated depreciation)	376		376
Other	17,744		19,889
TOTAL	18,444		20,614
PROPERTY, PLANT, AND EQUIPMENT
Electric	6,918,133		6,007,687
Construction work in progress	181,473		879,908
TOTAL PROPERTY, PLANT, AND EQUIPMENT	7,099,606		6,887,595
Less - accumulated depreciation and amortization	1,981,761		1,864,494
PROPERTY, PLANT, AND EQUIPMENT - NET	5,117,845		5,023,101
Regulatory assets:
Other regulatory assets	481,094		524,713
Other	81,501		70,397
Deferred Costs and Other Assets	562,595		595,110
TOTAL ASSETS	6,056,000		6,227,071
CURRENT LIABILITIES
Currently maturing long-term debt	75,000		200,000
Associated companies accounts payable	110,028		55,944
Accounts payable	179,398		350,947
Taxes Payable, Current	48,381		52,438
Interest accrued	19,784		20,856
Deferred fuel costs	12,819		85,356
Current portion of regulatory liability for income taxes - net related to unprotected ADIT	29,855		29,249
Other	14,303		12,370
TOTAL	523,005		843,442
NON-CURRENT LIABILITIES
Deferred Income Tax Liabilities, Net	647,348		639,422
Accumulated deferred investment tax credits	9,634		9,942
Regulatory liability for income taxes - net	157,086		175,594
Other regulatory liabilities	48,163		32,297
Decommissioning and asset retirement cost liabilities	8,288		8,063
Loss Contingency Accrual	8,696		8,382
Long-term debt	2,248,879		2,293,708
Deferred Credits and Other Liabilities	68,416		58,643
TOTAL	$ 3,196,510		$ 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	2,301,485		2,122,578
Stockholders' Equity Attributable to Noncontrolling Interest	35,000		35,000
Retained Earnings (Accumulated Deficit)	1,211,871		1,117,964
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	2,336,485		2,157,578	2,053,031	1,799,407
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	6,056,000		6,227,071
Long-term Transition Bond, Noncurrent	77,908		123,066
Securitized Regulatory Transition Assets, Noncurrent	52,330		78,590
Contract with Customer, Liability, Current	$ 33,437		$ 36,282
Common Stock, Shares Authorized	200,000,000		200,000,000
System Energy [Member]
Cash and cash equivalents:
Cash	$ 139		$ 26,086
Temporary cash investments	119,083		216,383
Total cash and cash equivalents	119,222		242,469	107	68,534
Accounts receivable:
Associated companies	127,194		57,743
Other	5,083		2,550
Total accounts receivable	132,277		60,293
Public Utilities, Inventory	136,428		123,006
Deferred nuclear refueling outage costs	21,314		34,459
Prepaid Expense and Other Assets, Current	6,143		6,864
TOTAL	415,384		467,091
OTHER PROPERTY AND INVESTMENTS
Decommissioning trust funds	1,312,525		1,215,868
TOTAL	1,312,525		1,215,868
PROPERTY, PLANT, AND EQUIPMENT
Electric	5,321,319		5,309,458
Construction work in progress	75,019		59,831
Nuclear fuel	133,364		175,005
TOTAL PROPERTY, PLANT, AND EQUIPMENT	5,529,702		5,544,294
Less - accumulated depreciation and amortization	3,351,715		3,355,367
PROPERTY, PLANT, AND EQUIPMENT - NET	2,177,987		2,188,927
Regulatory assets:
Other regulatory assets	478,014		538,963
Other	2,277		3,119
Deferred Costs and Other Assets	480,291		542,082
TOTAL ASSETS	4,386,187		4,413,968
CURRENT LIABILITIES
Currently maturing long-term debt	50,324		100,015
Associated companies accounts payable	18,825		15,309
Accounts payable	38,862		41,313
Taxes Payable, Current	55,279		82,977
Interest accrued	11,620		12,722
Other	4,246		4,248
TOTAL	179,156		256,584
NON-CURRENT LIABILITIES
Deferred Income Tax Liabilities, Net	349,912		359,835
Accumulated deferred investment tax credits	43,643		38,902
Regulatory liability for income taxes - net	132,794		151,829
Other regulatory liabilities	733,464		665,396
Decommissioning and asset retirement cost liabilities	988,064		968,910
Pension and other postretirement liabilities	113,169		125,412
Long-term debt	700,615		705,259
Deferred Credits and Other Liabilities	36,630		61,295
TOTAL	$ 3,098,291		$ 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)	156,890		128,696
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,108,740		1,080,546	$ 709,919	$ 712,068
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 4,386,187		$ 4,413,968
Common Stock, Shares Authorized	1,000,000		1,000,000