Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Cash and Cash Equivalents [Abstract]
Cash	$ 69,157	$ 48,424
Cash Equivalents, at Carrying Value	1,444,253	811,279
Cash and Cash Equivalents, at Carrying Value, Total	1,513,410	859,703
Accounts Receivable [Abstract]
Accounts Receivable, before Allowance for Credit Loss, Current	741,254	681,504
Accounts Receivable, Allowance for Credit Loss, Current	(17,638)	(17,919)
Other Receivables	154,986	204,868
Unbilled Receivables, Current	460,320	521,946
Accounts and Other Receivables, Net, Current	1,338,922	1,390,399
Deferred Fuel Cost	125,490	0
Energy Related Inventory	164,134	166,408
Public Utilities, Inventory	1,539,551	1,631,056
Prepaid Expense and Other Assets, Current	316,659	233,212
Deferred Nuclear Refueling Outage Costs	98,324	99,885
Assets, Current, Total	5,112,388	4,396,237
Assets, Noncurrent [Abstract]
Decommissioning Fund Investments	5,446,731	5,562,575
Property, Plant and Equipment, Net	467,020	423,764
Asset Recovery Damaged Property Costs, Noncurrent	300,269	340,460
Other Long-Term Investments	82,896	82,344
Long-Term Investments, Total	6,296,916	6,409,143
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Public Utilities, Property, Plant and Equipment, Electric	71,237,319	70,818,667
Public Utilities, Property, Plant and Equipment, Natural Gas	77,529	77,054
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	4,422,150	3,206,308
Public Utilities, Property, Plant and Equipment, Fuel	728,969	765,661
Public Utilities, Property, Plant and Equipment, Plant in Service, Total	76,465,967	74,867,690
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	27,792,637	27,444,740
Public Utilities, Property, Plant and Equipment, Net, Total	48,673,330	47,422,950
Regulatory Asset [Abstract]
Regulatory Asset, Noncurrent	5,101,032	5,255,509
Deferred Fuel Cost, Noncurrent	172,201	172,201
Goodwill	367,696	367,625
Deferred Income Tax Assets, Net	25,759	18,986
Other Assets, Noncurrent	403,872	284,584
Deferred Costs and Other Assets	6,537,775	6,561,702
Assets, Total	66,620,409	64,790,032
Liabilities, Current [Abstract]
Long-Term Debt, Current Maturities	1,330,112	1,378,090
Short-Term Debt	1,329,985	927,291
Accounts Payable, Current	1,809,891	1,929,162
Contract with Customer, Refund Liability, Current	468,584	462,436
Taxes Payable, Current	360,233	457,093
Interest Payable, Current	271,149	259,554
Deferred Fuel Costs Current Liabilities	85,110	237,146
Liability, Defined Benefit Plan, Current	63,156	64,854
Other Liabilities, Current	482,035	395,411
Liabilities, Current, Total	6,200,255	6,111,037
Liabilities, Noncurrent [Abstract]
Deferred Income Taxes and Other Tax Liabilities, Noncurrent	4,586,943	4,467,748
Accumulated Deferred Investment Tax Credit	191,997	194,146
Regulatory Liability For Income Taxes - Net	1,148,896	1,168,078
Regulatory Liability, Noncurrent	3,425,277	3,609,463
Asset Retirement Obligations, Noncurrent	4,765,021	4,713,426
Loss Contingency Accrual	471,824	506,063
Liability, Defined Benefit Plan, Noncurrent	215,740	254,704
Long-Term Debt, Excluding Current Maturities	28,264,879	26,613,505
Deferred Credits and Other Liabilities	1,151,265	1,112,881
Liabilities, Noncurrent, Total	44,918,344	43,274,601
Commitments and Contingencies
Temporary Equity, Carrying Amount, Attributable to Parent	219,410	219,410
Common Shareholders Equity [Abstract]
Preferred Stock, Value, Issued	0	0
Common Stock, Value, Issued	5,620	5,620
Additional Paid in Capital, Common Stock	7,792,748	7,833,525
Retained Earnings (Accumulated Deficit)	12,116,826	12,014,315
Accumulated Other Comprehensive Income (Loss), Net of Tax	39,040	42,769
Treasury Stock, Value	4,768,923	4,812,321
Equity, Attributable to Parent, Total	15,185,311	15,083,908
Equity, Attributable to Noncontrolling Interest	97,089	101,076
Equity, Including Portion Attributable to Noncontrolling Interest, Total	15,282,400	15,184,984
Liabilities and Equity, Total	66,620,409	64,790,032
Customer advances for construction, noncurrent	696,502	634,587
Disposal Group, Including Discontinued Operation, Assets, Current	15,898	15,574
Disposal Group, Including Discontinued Operation, Assets, Noncurrent	467,215	462,797
Entergy Arkansas [Member]
Cash and Cash Equivalents [Abstract]
Cash	154	1,306
Cash Equivalents, at Carrying Value	54,906	3,441
Cash and Cash Equivalents, at Carrying Value, Total	55,060	4,747
Accounts Receivable [Abstract]
Accounts Receivable, Allowance for Credit Loss, Current	(4,947)	(4,672)
Other Receivables	57,008	70,927
Unbilled Receivables, Current	102,383	125,824
Accounts and Other Receivables, Net, Current	355,449	366,725
Energy Related Inventory	56,573	49,937
Public Utilities, Inventory	394,613	384,238
Prepaid Expense and Other Assets, Current	45,215	41,404
Deferred Nuclear Refueling Outage Costs	37,611	48,879
Assets, Current, Total	944,521	895,930
Assets, Noncurrent [Abstract]
Decommissioning Fund Investments	1,571,159	1,604,428
Other Long-Term Investments	796	797
Long-Term Investments, Total	1,571,955	1,605,225
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Public Utilities, Property, Plant and Equipment, Electric	16,407,844	16,371,182
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	434,808	320,447
Public Utilities, Property, Plant and Equipment, Fuel	200,749	257,533
Public Utilities, Property, Plant and Equipment, Plant in Service, Total	17,043,401	16,949,162
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	6,367,812	6,275,150
Public Utilities, Property, Plant and Equipment, Net, Total	10,675,589	10,674,012
Regulatory Asset [Abstract]
Regulatory Asset, Noncurrent	1,689,961	1,700,110
Other Assets, Noncurrent	210,061	198,706
Deferred Costs and Other Assets	1,900,022	1,898,816
Assets, Total	15,092,087	15,073,983
Liabilities, Current [Abstract]
Contract with Customer, Refund Liability, Current	131,951	129,267
Taxes Payable, Current	91,845	93,215
Interest Payable, Current	64,324	38,377
Deferred Fuel Costs Current Liabilities	2,910	45,158
Other Liabilities, Current	54,834	55,313
Liabilities, Current, Total	605,446	656,507
Liabilities, Noncurrent [Abstract]
Deferred Income Taxes and Other Tax Liabilities, Noncurrent	1,529,054	1,489,169
Accumulated Deferred Investment Tax Credit	25,769	26,069
Regulatory Liability For Income Taxes - Net	420,275	417,561
Regulatory Liability, Noncurrent	780,511	831,165
Asset Retirement Obligations, Noncurrent	1,716,205	1,691,583
Loss Contingency Accrual	80,920	76,479
Long-Term Debt, Excluding Current Maturities	5,107,853	5,122,494
Deferred Credits and Other Liabilities	275,707	298,951
Liabilities, Noncurrent, Total	9,936,294	9,953,471
Commitments and Contingencies
Common Shareholders Equity [Abstract]
Members' Equity	4,536,551	4,448,837
Equity, Attributable to Noncontrolling Interest	13,796	15,168
Equity, Including Portion Attributable to Noncontrolling Interest, Total	4,550,347	4,464,005
Liabilities and Equity, Total	15,092,087	15,073,983
Entergy Arkansas [Member] | Affiliated Entity [Member]
Accounts Receivable [Abstract]
Accounts Receivable, before Allowance for Credit Loss, Current	47,076	35,412
Liabilities, Current [Abstract]
Accounts Payable, Current	39,988	85,137
Entergy Arkansas [Member] | Nonrelated Party [Member]
Accounts Receivable [Abstract]
Accounts Receivable, before Allowance for Credit Loss, Current	153,929	139,234
Liabilities, Current [Abstract]
Accounts Payable, Current	219,594	210,040
Entergy Louisiana [Member]
Cash and Cash Equivalents [Abstract]
Cash	211	327
Cash Equivalents, at Carrying Value	392,034	326,775
Cash and Cash Equivalents, at Carrying Value, Total	392,245	327,102
Accounts Receivable [Abstract]
Accounts Receivable, Allowance for Credit Loss, Current	(3,148)	(3,036)
Other Receivables	40,755	39,056
Unbilled Receivables, Current	195,155	213,026
Accounts and Other Receivables, Net, Current	716,246	646,190
Deferred Fuel Cost	113,571	0
Energy Related Inventory	46,957	49,515
Public Utilities, Inventory	680,242	782,459
Prepaid Expense and Other Assets, Current	181,405	84,236
Deferred Nuclear Refueling Outage Costs	44,786	31,121
Prepaid Taxes	30,081	0
Assets, Current, Total	2,210,213	1,923,097
Assets, Noncurrent [Abstract]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	4,168,974	4,256,997
Decommissioning Fund Investments	2,378,235	2,429,088
Property, Plant and Equipment, Net	453,908	410,611
Asset Recovery Damaged Property Costs, Noncurrent	225,990	256,718
Other Long-Term Investments	9,831	9,749
Long-Term Investments, Total	7,236,938	7,363,163
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Public Utilities, Property, Plant and Equipment, Electric	29,010,385	28,736,547
Public Utilities, Property, Plant and Equipment, Natural Gas	34,133	33,775
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	1,217,409	761,090
Public Utilities, Property, Plant and Equipment, Fuel	350,069	288,084
Public Utilities, Property, Plant and Equipment, Plant in Service, Total	30,611,996	29,819,496
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	10,894,148	10,794,817
Public Utilities, Property, Plant and Equipment, Net, Total	19,717,848	19,024,679
Regulatory Asset [Abstract]
Regulatory Asset, Noncurrent	1,572,870	1,637,967
Deferred Fuel Cost, Noncurrent	168,122	168,122
Other Assets, Noncurrent	76,176	57,853
Deferred Costs and Other Assets	1,993,747	2,037,611
Assets, Total	31,158,746	30,348,550
Liabilities, Current [Abstract]
Long-Term Debt, Current Maturities	250,000	300,000
Contract with Customer, Refund Liability, Current	170,677	169,544
Taxes Payable, Current	0	29,002
Interest Payable, Current	72,935	120,186
Deferred Fuel Costs Current Liabilities	0	5,421
Other Liabilities, Current	92,939	96,426
Liabilities, Current, Total	1,471,597	1,514,016
Liabilities, Noncurrent [Abstract]
Deferred Income Taxes and Other Tax Liabilities, Noncurrent	2,649,356	2,477,954
Accumulated Deferred Investment Tax Credit	87,553	88,679
Regulatory Liability For Income Taxes - Net	343,434	355,432
Regulatory Liability, Noncurrent	1,602,433	1,692,547
Asset Retirement Obligations, Noncurrent	1,861,362	1,842,855
Loss Contingency Accrual	253,799	279,623
Liability, Defined Benefit Plan, Noncurrent	155,012	160,577
Long-Term Debt, Excluding Current Maturities	10,155,643	9,566,453
Deferred Credits and Other Liabilities	481,753	479,178
Liabilities, Noncurrent, Total	17,871,679	17,235,140
Commitments and Contingencies
Common Shareholders Equity [Abstract]
Members' Equity	11,720,213	11,503,030
Equity, Attributable to Noncontrolling Interest	42,570	42,706
Accumulated Other Comprehensive Income (Loss), Net of Tax	52,687	53,658
Equity, Including Portion Attributable to Noncontrolling Interest, Total	11,815,470	11,599,394
Liabilities and Equity, Total	31,158,746	30,348,550
Customer Advances, Current Liabilities	150,967	151,662
Customer advances for construction, noncurrent	281,334	291,842
Disposal Group, Including Discontinued Operation, Assets, Current	4,680	2,474
Disposal Group, Including Discontinued Operation, Assets, Noncurrent	176,579	173,669
Entergy Louisiana [Member] | Affiliated Entity [Member]
Accounts Receivable [Abstract]
Accounts Receivable, before Allowance for Credit Loss, Current	153,893	103,055
Liabilities, Current [Abstract]
Accounts Payable, Current	64,963	108,688
Entergy Louisiana [Member] | Nonrelated Party [Member]
Accounts Receivable [Abstract]
Accounts Receivable, before Allowance for Credit Loss, Current	329,591	294,089
Liabilities, Current [Abstract]
Accounts Payable, Current	669,116	533,087
Entergy Mississippi [Member]
Cash and Cash Equivalents [Abstract]
Cash	141	184
Cash Equivalents, at Carrying Value	598,016	155,509
Cash and Cash Equivalents, at Carrying Value, Total	598,157	155,693
Accounts Receivable [Abstract]
Accounts Receivable, Allowance for Credit Loss, Current	(2,074)	(2,172)
Other Receivables	12,121	25,148
Unbilled Receivables, Current	66,051	75,740
Accounts and Other Receivables, Net, Current	301,695	220,234
Energy Related Inventory	12,821	14,963
Public Utilities, Inventory	113,838	113,256
Prepaid Expense and Other Assets, Current	51,825	19,764
Assets, Current, Total	1,078,336	523,910
Assets, Noncurrent [Abstract]
Property, Plant and Equipment, Net	4,478	4,482
Other Long-Term Investments	920	880
Long-Term Investments, Total	5,398	5,362
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Public Utilities, Property, Plant and Equipment, Electric	7,916,942	7,860,409
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	739,110	487,273
Public Utilities, Property, Plant and Equipment, Plant in Service, Total	8,656,052	8,347,682
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	2,551,210	2,511,091
Public Utilities, Property, Plant and Equipment, Net, Total	6,104,842	5,836,591
Regulatory Asset [Abstract]
Regulatory Asset, Noncurrent	487,430	525,847
Other Assets, Noncurrent	104,509	97,260
Deferred Costs and Other Assets	591,939	623,107
Assets, Total	7,780,515	6,988,970
Liabilities, Current [Abstract]
Contract with Customer, Refund Liability, Current	96,819	94,009
Taxes Payable, Current	133,493	179,024
Interest Payable, Current	37,174	20,667
Deferred Fuel Costs Current Liabilities	79,953	126,316
Other Liabilities, Current	19,493	20,720
Liabilities, Current, Total	775,420	782,578
Liabilities, Noncurrent [Abstract]
Deferred Income Taxes and Other Tax Liabilities, Noncurrent	831,951	870,116
Accumulated Deferred Investment Tax Credit	13,340	13,446
Regulatory Liability For Income Taxes - Net	178,278	180,851
Regulatory Liability, Noncurrent	73,151	59,544
Asset Retirement Obligations, Noncurrent	25,460	25,110
Loss Contingency Accrual	44,789	47,200
Long-Term Debt, Excluding Current Maturities	3,020,618	2,427,073
Deferred Credits and Other Liabilities	87,126	61,446
Liabilities, Noncurrent, Total	4,486,741	3,797,404
Commitments and Contingencies
Common Shareholders Equity [Abstract]
Members' Equity	2,512,631	2,400,786
Equity, Attributable to Noncontrolling Interest	5,723	8,202
Equity, Including Portion Attributable to Noncontrolling Interest, Total	2,518,354	2,408,988
Liabilities and Equity, Total	7,780,515	6,988,970
Customer Advances, Current Liabilities	106,494	0
Customer advances for construction, noncurrent	212,028	112,618
Entergy Mississippi [Member] | Affiliated Entity [Member]
Accounts Receivable [Abstract]
Accounts Receivable, before Allowance for Credit Loss, Current	116,538	23,909
Liabilities, Current [Abstract]
Accounts Payable, Current	53,243	58,087
Entergy Mississippi [Member] | Nonrelated Party [Member]
Accounts Receivable [Abstract]
Accounts Receivable, before Allowance for Credit Loss, Current	109,059	97,609
Liabilities, Current [Abstract]
Accounts Payable, Current	248,751	283,755
Entergy New Orleans [Member]
Cash and Cash Equivalents [Abstract]
Cash	34	374
Cash Equivalents, at Carrying Value	13,892	31,403
Cash and Cash Equivalents, at Carrying Value, Total	13,926	31,777
Other Restricted Assets, Current	913	1,611
Accounts Receivable [Abstract]
Accounts Receivable, Allowance for Credit Loss, Current	(6,343)	(6,735)
Other Receivables	3,733	9,467
Unbilled Receivables, Current	27,199	33,296
Accounts and Other Receivables, Net, Current	96,917	107,603
Deferred Fuel Cost	11,918	0
Energy Related Inventory	1,251	320
Public Utilities, Inventory	28,244	25,516
Prepaid Expense and Other Assets, Current	19,834	12,128
Assets, Current, Total	184,221	192,055
Assets, Noncurrent [Abstract]
Asset Recovery Damaged Property Costs, Noncurrent	74,279	83,742
Other Long-Term Investments	832	832
Long-Term Investments, Total	75,111	84,574
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Public Utilities, Property, Plant and Equipment, Electric	2,156,506	2,160,165
Public Utilities, Property, Plant and Equipment, Natural Gas	43,396	43,279
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	36,501	18,269
Public Utilities, Property, Plant and Equipment, Plant in Service, Total	2,236,403	2,221,713
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	778,749	768,305
Public Utilities, Property, Plant and Equipment, Net, Total	1,457,654	1,453,408
Regulatory Asset [Abstract]
Regulatory Asset, Noncurrent	127,473	133,261
Deferred Fuel Cost, Noncurrent	4,080	4,080
Other Assets, Noncurrent	74,782	71,037
Deferred Costs and Other Assets	492,652	493,116
Assets, Total	2,209,638	2,223,153
Liabilities, Current [Abstract]
Long-Term Debt, Current Maturities	80,000	78,000
Contract with Customer, Refund Liability, Current	28,905	28,834
Taxes Payable, Current	43,909	8,786
Interest Payable, Current	11,107	8,671
Deferred Fuel Costs Current Liabilities	0	980
Other Liabilities, Current	14,096	14,427
Liabilities, Current, Total	258,819	230,067
Liabilities, Noncurrent [Abstract]
Deferred Income Taxes and Other Tax Liabilities, Noncurrent	170,511	201,541
Accumulated Deferred Investment Tax Credit	15,591	15,617
Regulatory Liability For Income Taxes - Net	14,934	15,000
Regulatory Liability, Noncurrent	248,372	260,312
Loss Contingency Accrual	79,954	90,293
Long-Term Debt, Excluding Current Maturities	650,351	650,463
Deferred Credits and Other Liabilities	55,542	56,395
Liabilities, Noncurrent, Total	1,241,119	1,295,485
Commitments and Contingencies
Common Shareholders Equity [Abstract]
Members' Equity	709,700	697,601
Equity, Including Portion Attributable to Noncontrolling Interest, Total	709,700	697,601
Liabilities and Equity, Total	2,209,638	2,223,153
Disposal Group, Including Discontinued Operation, Assets, Current	11,218	13,100
Disposal Group, Including Discontinued Operation, Assets, Noncurrent	286,317	284,738
Entergy New Orleans [Member] | Affiliated Entity [Member]
Accounts Receivable [Abstract]
Accounts Receivable, before Allowance for Credit Loss, Current	4,440	5,844
Liabilities, Current [Abstract]
Notes Payable, Current	1,140	1,140
Accounts Payable, Current	44,413	45,479
Liabilities, Noncurrent [Abstract]
Notes Payable, Noncurrent	5,864	5,864
Entergy New Orleans [Member] | Nonrelated Party [Member]
Accounts Receivable [Abstract]
Accounts Receivable, before Allowance for Credit Loss, Current	67,888	65,731
Liabilities, Current [Abstract]
Accounts Payable, Current	35,249	43,750
Entergy Texas [Member]
Cash and Cash Equivalents [Abstract]
Cash	120	291
Cash Equivalents, at Carrying Value	298,015	184,706
Cash and Cash Equivalents, at Carrying Value, Total	298,135	184,997
Other Restricted Assets, Current	8,838	2,703
Accounts Receivable [Abstract]
Accounts Receivable, Allowance for Credit Loss, Current	(1,126)	(1,304)
Other Receivables	30,535	43,773
Unbilled Receivables, Current	69,532	74,060
Accounts and Other Receivables, Net, Current	240,839	227,935
Energy Related Inventory	40,419	45,970
Public Utilities, Inventory	155,043	157,241
Prepaid Expense and Other Assets, Current	33,146	34,803
Assets, Current, Total	776,420	653,649
Assets, Noncurrent [Abstract]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	96	107
Other Long-Term Investments	15,968	15,878
Long-Term Investments, Total	16,064	15,985
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Public Utilities, Property, Plant and Equipment, Electric	8,692,564	8,628,625
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	1,841,353	1,513,170
Public Utilities, Property, Plant and Equipment, Plant in Service, Total	10,533,917	10,141,795
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	2,609,736	2,548,961
Public Utilities, Property, Plant and Equipment, Net, Total	7,924,181	7,592,834
Regulatory Asset [Abstract]
Regulatory Asset, Noncurrent	521,801	549,708
Other Assets, Noncurrent	176,574	157,904
Deferred Costs and Other Assets	698,375	707,612
Assets, Total	9,415,040	8,970,080
Liabilities, Current [Abstract]
Contract with Customer, Refund Liability, Current	40,232	40,782
Taxes Payable, Current	37,385	76,474
Interest Payable, Current	16,287	38,703
Deferred Fuel Costs Current Liabilities	2,247	59,271
Other Liabilities, Current	17,577	20,836
Liabilities, Current, Total	552,248	662,805
Liabilities, Noncurrent [Abstract]
Deferred Income Taxes and Other Tax Liabilities, Noncurrent	885,116	868,849
Accumulated Deferred Investment Tax Credit	7,028	7,215
Regulatory Liability For Income Taxes - Net	87,909	93,766
Regulatory Liability, Noncurrent	18,248	18,705
Asset Retirement Obligations, Noncurrent	14,498	17,688
Loss Contingency Accrual	9,425	9,985
Long-Term Debt, Excluding Current Maturities	4,047,376	3,552,443
Deferred Credits and Other Liabilities	385,642	397,412
Liabilities, Noncurrent, Total	5,455,242	4,966,063
Commitments and Contingencies
Common Stock, No Par Value	$ 0	$ 0
Common Shareholders Equity [Abstract]
Preferred Stock, Value, Issued	$ 38,750	$ 38,750
Common Stock, Value, Issued	49,452	49,452
Additional Paid in Capital, Common Stock	1,200,125	1,200,125
Retained Earnings (Accumulated Deficit)	2,119,223	2,052,885
Equity, Attributable to Parent, Total	3,368,800	3,302,462
Equity, Including Portion Attributable to Noncontrolling Interest, Total	3,407,550	3,341,212
Liabilities and Equity, Total	9,415,040	8,970,080
Entergy Texas [Member] | Affiliated Entity [Member]
Accounts Receivable [Abstract]
Accounts Receivable, before Allowance for Credit Loss, Current	61,111	26,564
Liabilities, Current [Abstract]
Accounts Payable, Current	58,411	65,335
Entergy Texas [Member] | Nonrelated Party [Member]
Accounts Receivable [Abstract]
Accounts Receivable, before Allowance for Credit Loss, Current	80,787	84,842
Liabilities, Current [Abstract]
Accounts Payable, Current	380,109	361,404
System Energy [Member]
Cash and Cash Equivalents [Abstract]
Cash	155	448
Cash Equivalents, at Carrying Value	2,414	28,460
Cash and Cash Equivalents, at Carrying Value, Total	2,569	28,908
Accounts Receivable [Abstract]
Accounts Receivable, before Allowance for Credit Loss, Current	53,122	48,134
Other Receivables	3,973	5,425
Accounts and Other Receivables, Net, Current	57,095	53,559
Public Utilities, Inventory	163,069	163,814
Prepaid Expense and Other Assets, Current	9,515	5,768
Deferred Nuclear Refueling Outage Costs	15,927	19,884
Assets, Current, Total	248,175	271,933
Assets, Noncurrent [Abstract]
Decommissioning Fund Investments	1,497,337	1,529,059
Long-Term Investments, Total	1,497,337	1,529,059
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Public Utilities, Property, Plant and Equipment, Electric	5,667,176	5,668,253
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	110,883	85,127
Public Utilities, Property, Plant and Equipment, Fuel	178,151	220,044
Public Utilities, Property, Plant and Equipment, Plant in Service, Total	5,956,210	5,973,424
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	3,608,136	3,578,709
Public Utilities, Property, Plant and Equipment, Net, Total	2,348,074	2,394,715
Regulatory Asset [Abstract]
Regulatory Asset, Noncurrent	423,799	426,494
Other Assets, Noncurrent	22,033	20,273
Deferred Costs and Other Assets	445,832	446,767
Assets, Total	4,539,418	4,642,474
Liabilities, Current [Abstract]
Long-Term Debt, Current Maturities	200,112	200,090
Taxes Payable, Current	4,163	15,852
Interest Payable, Current	18,859	13,342
Other Liabilities, Current	4,475	4,473
Liabilities, Current, Total	250,265	297,251
Liabilities, Noncurrent [Abstract]
Deferred Income Taxes and Other Tax Liabilities, Noncurrent	456,917	451,830
Accumulated Deferred Investment Tax Credit	42,614	42,984
Regulatory Liability For Income Taxes - Net	104,065	105,467
Regulatory Liability, Noncurrent	703,269	747,190
Asset Retirement Obligations, Noncurrent	1,138,857	1,127,712
Liability, Defined Benefit Plan, Noncurrent	6,316	8,353
Long-Term Debt, Excluding Current Maturities	876,685	889,646
Deferred Credits and Other Liabilities	2	2
Liabilities, Noncurrent, Total	3,328,725	3,373,184
Commitments and Contingencies
Common Stock, No Par Value	$ 0	$ 0
Common Shareholders Equity [Abstract]
Common Stock, Value, Issued	$ 938,944	$ 958,944
Retained Earnings (Accumulated Deficit)	21,484	13,095
Equity, Including Portion Attributable to Noncontrolling Interest, Total	960,428	972,039
Liabilities and Equity, Total	4,539,418	4,642,474
System Energy [Member] | Affiliated Entity [Member]
Liabilities, Current [Abstract]
Accounts Payable, Current	5,248	18,477
System Energy [Member] | Nonrelated Party [Member]
Liabilities, Current [Abstract]
Accounts Payable, Current	$ 17,408	$ 45,017