Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash and cash equivalents:
Cash	$ 128,851	$ 34,242
Temporary cash investments	1,630,248	391,480
Total cash and cash equivalents	1,759,099	425,722	$ 480,975	$ 781,273
Accounts receivable:
Customer	833,478	595,509
Allowance for doubtful accounts	(117,794)	(7,404)
Other	135,208	219,870
Accrued unbilled revenues	434,835	400,617
Total accounts receivable	1,285,727	1,208,592
Deferred fuel costs	4,380	0
Fuel inventory - at average cost	172,934	145,476
Public Utilities, Inventory	962,185	824,989
Deferred nuclear refueling outage costs	179,150	157,568
Prepayments and other	196,424	283,645
TOTAL	4,559,899	3,045,992
OTHER PROPERTY AND INVESTMENTS
Decommissioning trust funds	7,253,215	6,404,030
Non-utility property - at cost (less accumulated depreciation)	343,328	332,864
Other	214,222	496,452
TOTAL	7,810,765	7,233,346
PROPERTY, PLANT, AND EQUIPMENT
Electric	59,696,443	54,271,467
Natural gas	610,768	547,110
Construction work in progress	2,012,030	2,823,291
Nuclear fuel	601,281	677,181
TOTAL PROPERTY, PLANT, AND EQUIPMENT	62,920,522	58,319,049
Less - accumulated depreciation and amortization	24,067,745	23,136,356
PROPERTY, PLANT, AND EQUIPMENT - NET	38,852,777	35,182,693
Regulatory assets:
Regulatory Assets, Noncurrent	6,076,549	5,292,055
Deferred Fuel Cost Non Current	240,422	239,892
Goodwill	377,172	377,172
Deferred Income Tax Assets, Net	76,289	64,461
Other	245,339	288,301
Deferred Costs and Other Assets	7,015,771	6,261,881
TOTAL ASSETS	58,239,212	51,723,912
CURRENT LIABILITIES
Currently maturing long-term debt	1,164,015	795,012
Short-term borrowings	1,627,489	1,946,727
Accounts payable	2,739,437	1,499,861
Customer deposits	401,512	409,171
Taxes accrued	441,011	233,455
Interest accrued	201,791	194,129
Deferred fuel costs	153,113	197,687
Pension and other postretirement liabilities	61,815	66,184
Current portion of regulatory liability for income taxes - net related to unprotected ADIT	63,683	76,457
Other	206,640	201,780
TOTAL	7,060,506	5,620,463
NON-CURRENT LIABILITIES
Deferred Income Tax Liabilities, Net	4,361,772	4,401,190
Accumulated deferred investment tax credits	212,494	207,113
Regulatory liability for income taxes - net	1,521,757	1,633,159
Other regulatory liabilities	2,323,851	1,961,005
Decommissioning trust fund	6,469,452	6,159,212
Loss Contingency Accrual	242,835	534,028
Pension and other postretirement liabilities	2,853,013	2,798,265
Long-term debt	21,205,761	17,078,643
Deferred Credits and Other Liabilities	807,219	852,749
TOTAL	39,998,154	35,625,364
Commitments and Contingencies
Subsidiaries’ preferred stock without sinking fund	219,410	219,410
EQUITY
Common stock	2,700	2,700
Additional Paid in Capital, Common Stock	6,549,923	6,564,436
Retained Earnings (Accumulated Deficit)	9,897,182	9,257,609
Accumulated other comprehensive loss	(449,207)	(446,920)	(557,173)
Less - treasury stock, at cost (76,681,936 shares in 2013 and 76,945,239 shares in 2012)	5,074,456	5,154,150
Total common shareholders' equity	10,926,142	10,223,675
Total common shareholders' equity	10,961,142	10,258,675	8,844,305	7,992,515
Stockholders' Equity Attributable to Noncontrolling Interest	35,000	35,000
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	58,239,212	51,723,912
Entergy New Orleans [Member]
Cash and cash equivalents:
Cash	26	26
Temporary cash investments	0	5,991
Total cash and cash equivalents	26	6,017	19,677	32,741
Restricted Investments, Current	3,364	1,989
Accounts receivable:
Customer	70,694	48,265
Allowance for doubtful accounts	(17,430)	(3,226)
Other	4,248	7,378
Accrued unbilled revenues	31,069	25,453
Total accounts receivable	90,962	84,150
Deferred fuel costs	2,130	0
Fuel inventory - at average cost	1,978	1,920
Public Utilities, Inventory	16,550	13,522
Prepayments and other	3,715	4,846
TOTAL	118,725	112,444
OTHER PROPERTY AND INVESTMENTS
Storm Reserve Escrow Account	83,038	82,605
Non-utility property - at cost (less accumulated depreciation)	1,016	1,016
TOTAL	84,054	83,621
PROPERTY, PLANT, AND EQUIPMENT
Electric	1,821,638	1,467,215
Natural gas	348,024	311,432
Construction work in progress	12,460	201,829
TOTAL PROPERTY, PLANT, AND EQUIPMENT	2,182,122	1,980,476
Less - accumulated depreciation and amortization	740,796	715,406
PROPERTY, PLANT, AND EQUIPMENT - NET	1,441,326	1,265,070
Regulatory assets:
Regulatory Assets, Noncurrent	266,790	259,363
Deferred Fuel Cost Non Current	4,080	4,080
Other	23,931	10,720
Deferred Costs and Other Assets	294,801	274,163
TOTAL ASSETS	1,938,906	1,735,298
CURRENT LIABILITIES
Currently maturing long-term debt	0	25,000
Notes Payable, Related Parties, Current	1,618	1,838
Associated companies accounts payable	54,234	43,222
Accounts payable	60,766	43,963
Customer deposits	27,912	28,493
Taxes accrued	4,700	4,302
Interest accrued	8,095	6,916
Deferred fuel costs	0	4,918
Current portion of regulatory liability for income taxes - net related to unprotected ADIT	3,296	9,470
Other	5,462	15,827
TOTAL	166,083	183,949
NON-CURRENT LIABILITIES
Deferred Income Tax Liabilities, Net	338,714	354,536
Accumulated deferred investment tax credits	16,095	2,131
Regulatory liability for income taxes - net	55,675	49,090
Decommissioning trust fund	3,768	3,522
Loss Contingency Accrual	89,898	88,542
Long-term debt	629,704	521,539
Notes Payable, Related Parties, Noncurrent	10,911	12,529
Deferred Credits and Other Liabilities	21,141	21,881
TOTAL	1,165,906	1,053,770
Commitments and Contingencies
Members' Equity	606,917	497,579
EQUITY
Total common shareholders' equity	606,917	497,579	444,950	415,548
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	1,938,906	1,735,298
Accounts Receivable, Related Parties, Current	2,381	6,280
Entergy Louisiana [Member]
Cash and cash equivalents:
Cash	1,303	488
Temporary cash investments	726,717	1,518
Total cash and cash equivalents	728,020	2,006	43,364	35,907
Accounts receivable:
Customer	317,905	194,869
Allowance for doubtful accounts	(45,693)	(1,902)
Other	41,760	42,179
Accrued unbilled revenues	178,840	169,201
Total accounts receivable	574,436	481,559
Deferred fuel costs	2,250	0
Fuel inventory - at average cost	50,680	41,613
Public Utilities, Inventory	437,933	354,020
Deferred nuclear refueling outage costs	48,407	56,743
Prepaid Taxes	0	7,959
Prepayments and other	36,813	37,837
TOTAL	1,878,539	981,737
Investments in and Advances to Affiliates, at Fair Value	1,390,587	1,390,587
OTHER PROPERTY AND INVESTMENTS
Decommissioning trust funds	1,794,042	1,563,812
Storm Reserve Escrow Account	0	295,875
Non-utility property - at cost (less accumulated depreciation)	323,110	312,896
Other	13,399	13,476
TOTAL	3,521,138	3,576,646
PROPERTY, PLANT, AND EQUIPMENT
Electric	25,619,789	22,620,365
Natural gas	262,744	235,678
Construction work in progress	667,281	1,383,603
Nuclear fuel	210,128	267,779
TOTAL PROPERTY, PLANT, AND EQUIPMENT	26,759,942	24,507,425
Less - accumulated depreciation and amortization	9,372,224	9,118,524
PROPERTY, PLANT, AND EQUIPMENT - NET	17,387,718	15,388,901
Regulatory assets:
Regulatory Assets, Noncurrent	1,726,066	1,315,211
Deferred Fuel Cost Non Current	168,122	168,122
Other	23,924	33,491
Deferred Costs and Other Assets	1,918,112	1,516,824
TOTAL ASSETS	24,705,507	21,464,108
CURRENT LIABILITIES
Currently maturing long-term debt	240,000	320,002
Associated companies accounts payable	103,148	187,615
Accounts payable	1,450,008	357,206
Customer deposits	152,612	153,097
Taxes accrued	42,617	0
Interest accrued	92,249	87,744
Deferred fuel costs	0	55,645
Current portion of regulatory liability for income taxes - net related to unprotected ADIT	31,138	31,138
Other	62,968	64,668
TOTAL	2,174,740	1,257,115
NON-CURRENT LIABILITIES
Deferred Income Tax Liabilities, Net	2,138,522	2,464,513
Accumulated deferred investment tax credits	107,317	112,128
Regulatory liability for income taxes - net	447,628	500,083
Other regulatory liabilities	918,293	794,140
Decommissioning trust fund	1,573,307	1,497,349
Loss Contingency Accrual	24,939	320,419
Pension and other postretirement liabilities	692,728	677,619
Long-term debt	8,787,451	6,983,667
Deferred Credits and Other Liabilities	382,894	459,957
TOTAL	15,073,079	13,809,875
Commitments and Contingencies
Members' Equity	7,453,361	6,392,556
EQUITY
Accumulated other comprehensive loss	4,327	4,562
Total common shareholders' equity	7,457,688	6,397,118	5,902,918	5,308,804
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	24,705,507	21,464,108
Accounts Receivable, Related Parties, Current	81,624	77,212
Entergy Arkansas [Member]
Cash and cash equivalents:
Cash	24,108	3,519
Temporary cash investments	168,020	0
Total cash and cash equivalents	192,128	3,519	119	6,216
Restricted Investments, Current	0	4,036
Accounts receivable:
Customer	183,719	117,679
Allowance for doubtful accounts	(18,334)	(1,169)
Other	35,845	117,653
Accrued unbilled revenues	109,000	108,489
Total accounts receivable	344,446	371,830
Fuel inventory - at average cost	43,811	33,745
Public Utilities, Inventory	237,640	211,320
Deferred nuclear refueling outage costs	32,692	48,875
Prepayments and other	13,296	14,096
TOTAL	864,013	687,421
OTHER PROPERTY AND INVESTMENTS
Decommissioning trust funds	1,273,921	1,101,283
Other	341	345
TOTAL	1,274,262	1,101,628
PROPERTY, PLANT, AND EQUIPMENT
Electric	12,905,322	12,293,483
Construction work in progress	234,213	197,775
Nuclear fuel	163,044	195,547
TOTAL PROPERTY, PLANT, AND EQUIPMENT	13,302,579	12,686,805
Less - accumulated depreciation and amortization	5,255,355	5,019,826
PROPERTY, PLANT, AND EQUIPMENT - NET	8,047,224	7,666,979
Regulatory assets:
Regulatory Assets, Noncurrent	1,832,384	1,666,850
Deferred Fuel Cost Non Current	68,220	67,690
Other	14,028	15,065
Deferred Costs and Other Assets	1,914,632	1,749,605
TOTAL ASSETS	12,100,131	11,205,633
CURRENT LIABILITIES
Currently maturing long-term debt	485,000	0
Associated companies accounts payable	59,448	111,785
Accounts payable	208,591	202,201
Customer deposits	98,506	101,411
Taxes accrued	81,837	81,831
Interest accrued	22,745	22,788
Deferred fuel costs	53,065	53,721
Current portion of regulatory liability for income taxes - net related to unprotected ADIT	0	9,296
Other	40,628	38,760
TOTAL	1,049,820	621,793
NON-CURRENT LIABILITIES
Deferred Income Tax Liabilities, Net	1,286,123	1,183,126
Accumulated deferred investment tax credits	30,500	31,701
Regulatory liability for income taxes - net	467,031	478,174
Other regulatory liabilities	686,872	559,555
Decommissioning trust fund	1,314,160	1,242,616
Loss Contingency Accrual	70,169	63,880
Pension and other postretirement liabilities	361,682	319,075
Long-term debt	3,482,507	3,517,208
Deferred Credits and Other Liabilities	75,098	62,568
TOTAL	7,774,142	7,457,903
Commitments and Contingencies
Members' Equity	3,276,169	3,125,937
EQUITY
Total common shareholders' equity	3,276,169	3,125,937	2,983,103	2,376,754
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	12,100,131	11,205,633
Accounts Receivable, Related Parties, Current	34,216	29,178
Entergy Mississippi [Member]
Cash and cash equivalents:
Cash	11	11
Temporary cash investments	7	51,590
Total cash and cash equivalents	18	51,601	36,954	6,096
Accounts receivable:
Customer	105,732	92,050
Allowance for doubtful accounts	(19,527)	(636)
Other	11,821	14,986
Accrued unbilled revenues	59,514	47,426
Total accounts receivable	160,280	203,083
Fuel inventory - at average cost	17,117	15,139
Public Utilities, Inventory	59,542	57,972
Prepayments and other	4,876	7,149
TOTAL	241,833	334,944
OTHER PROPERTY AND INVESTMENTS
Non-utility property - at cost (less accumulated depreciation)	4,543	4,560
TOTAL	69,178	84,761
PROPERTY, PLANT, AND EQUIPMENT
Electric	6,084,730	5,672,589
Construction work in progress	134,854	88,373
TOTAL PROPERTY, PLANT, AND EQUIPMENT	6,219,584	5,760,962
Less - accumulated depreciation and amortization	2,005,087	1,894,000
PROPERTY, PLANT, AND EQUIPMENT - NET	4,214,497	3,866,962
Regulatory assets:
Regulatory Assets, Noncurrent	467,341	377,972
Other	14,413	10,105
Deferred Costs and Other Assets	481,754	388,077
TOTAL ASSETS	5,007,262	4,674,744
CURRENT LIABILITIES
Currently maturing long-term debt	0	0
Associated companies accounts payable	61,727	48,090
Accounts payable	117,629	94,729
Customer deposits	86,200	85,938
Taxes accrued	108,084	90,661
Interest accrued	20,889	18,900
Deferred fuel costs	14,691	70,402
Other	34,270	32,667
TOTAL	443,490	441,387
NON-CURRENT LIABILITIES
Deferred Income Tax Liabilities, Net	646,674	594,832
Accumulated deferred investment tax credits	9,062	9,602
Regulatory liability for income taxes - net	224,000	236,988
Other regulatory liabilities	15,828	21,512
Decommissioning trust fund	9,762	9,727
Loss Contingency Accrual	46,504	50,021
Pension and other postretirement liabilities	110,901	99,406
Long-term debt	1,780,577	1,614,129
Deferred Credits and Other Liabilities	47,730	54,989
TOTAL	2,891,038	2,691,206
Commitments and Contingencies
Members' Equity	1,672,734	1,542,151
EQUITY
Total common shareholders' equity	1,672,734	1,542,151	1,292,226	1,177,870
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	5,007,262	4,674,744
Accounts Receivable, Related Parties, Current	2,740	49,257
Escrow accounts	64,635	80,201
Entergy Texas [Member]
Cash and cash equivalents:
Cash	26	25
Temporary cash investments	248,570	12,904
Total cash and cash equivalents	248,596	12,929	56	115,513
Restricted Investments, Current	36,233	37,720
Accounts receivable:
Customer	103,221	59,365
Allowance for doubtful accounts	(16,810)	(471)
Other	11,780	17,050
Accrued unbilled revenues	56,411	50,048
Total accounts receivable	173,494	149,993
Fuel inventory - at average cost	53,531	47,593
Public Utilities, Inventory	56,227	46,056
Prepayments and other	20,165	21,012
TOTAL	588,246	315,303
Equity Method Investments	349	396
OTHER PROPERTY AND INVESTMENTS
Non-utility property - at cost (less accumulated depreciation)	376	376
Other	19,889	20,077
TOTAL	20,614	20,849
PROPERTY, PLANT, AND EQUIPMENT
Electric	6,007,687	5,199,027
Construction work in progress	879,908	760,354
TOTAL PROPERTY, PLANT, AND EQUIPMENT	6,887,595	5,959,381
Less - accumulated depreciation and amortization	1,864,494	1,770,852
PROPERTY, PLANT, AND EQUIPMENT - NET	5,023,101	4,188,529
Regulatory assets:
Regulatory Assets, Noncurrent	524,713	512,648
Other	70,397	33,393
Deferred Costs and Other Assets	595,110	546,041
TOTAL ASSETS	6,227,071	5,070,722
CURRENT LIABILITIES
Currently maturing long-term debt	200,000	0
Associated companies accounts payable	55,944	58,055
Accounts payable	350,947	188,460
Customer deposits	36,282	40,232
Taxes accrued	52,438	49,708
Interest accrued	20,856	18,992
Deferred fuel costs	85,356	13,001
Current portion of regulatory liability for income taxes - net related to unprotected ADIT	29,249	26,552
Other	12,370	10,521
TOTAL	843,442	405,521
NON-CURRENT LIABILITIES
Deferred Income Tax Liabilities, Net	639,422	585,413
Accumulated deferred investment tax credits	9,942	10,559
Regulatory liability for income taxes - net	175,594	225,980
Other regulatory liabilities	32,297	42,085
Decommissioning trust fund	8,063	7,631
Loss Contingency Accrual	8,382	8,108
Long-term debt	2,293,708	1,922,956
Deferred Credits and Other Liabilities	58,643	63,062
TOTAL	3,226,051	2,865,794
Commitments and Contingencies
Subsidiaries’ preferred stock without sinking fund	35,000	35,000
EQUITY
Common stock	49,452	49,452
Additional Paid in Capital, Common Stock	955,162	780,182
Retained Earnings (Accumulated Deficit)	1,117,964	934,773
Total common shareholders' equity	2,122,578	1,764,407
Total common shareholders' equity	2,157,578	1,799,407	1,422,402	1,260,167
Stockholders' Equity Attributable to Noncontrolling Interest	35,000	35,000
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	6,227,071	5,070,722
Accounts Receivable, Related Parties, Current	18,892	24,001
System Energy [Member]
Cash and cash equivalents:
Cash	26,086	93
Temporary cash investments	216,383	68,441
Total cash and cash equivalents	242,469	68,534	95,685	287,187
Accounts receivable:
Other	2,550	7,547
Total accounts receivable	60,293	129,519
Public Utilities, Inventory	123,006	108,766
Deferred nuclear refueling outage costs	34,459	14,493
Prepayments and other	6,864	6,045
TOTAL	467,091	327,357
OTHER PROPERTY AND INVESTMENTS
Decommissioning trust funds	1,215,868	1,054,098
TOTAL	1,215,868	1,054,098
PROPERTY, PLANT, AND EQUIPMENT
Electric	5,309,458	5,070,859
Construction work in progress	59,831	164,996
Nuclear fuel	175,005	149,574
TOTAL PROPERTY, PLANT, AND EQUIPMENT	5,544,294	5,385,429
Less - accumulated depreciation and amortization	3,355,367	3,285,487
PROPERTY, PLANT, AND EQUIPMENT - NET	2,188,927	2,099,942
Regulatory assets:
Regulatory Assets, Noncurrent	538,963	490,083
Deferred Income Tax Assets, Net	0	8,023
Other	3,119	3,192
Deferred Costs and Other Assets	542,082	501,298
TOTAL ASSETS	4,413,968	3,982,695
CURRENT LIABILITIES
Currently maturing long-term debt	100,015	10
Associated companies accounts payable	15,309	14,619
Accounts payable	41,313	64,144
Taxes accrued	82,977	13,832
Interest accrued	12,722	11,993
Other	4,248	3,381
TOTAL	256,584	107,979
NON-CURRENT LIABILITIES
Deferred Income Tax Liabilities, Net	359,835	821,963
Accumulated deferred investment tax credits	38,902	40,181
Regulatory liability for income taxes - net	151,829	142,845
Other regulatory liabilities	665,396	533,415
Decommissioning trust fund	968,910	931,729
Pension and other postretirement liabilities	125,412	109,816
Long-term debt	705,259	548,097
Deferred Credits and Other Liabilities	61,295	34,602
TOTAL	3,076,838	3,162,648
Commitments and Contingencies
EQUITY
Common stock	951,850	601,850
Retained Earnings (Accumulated Deficit)	128,696	110,218
Total common shareholders' equity	1,080,546	712,068	$ 737,198	$ 710,809
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	4,413,968	3,982,695
Accounts Receivable, Related Parties, Current	$ 57,743	$ 121,972