Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Cash and Cash Equivalents [Abstract]
Cash	$ 68,145	$ 45,895
Cash Equivalents, at Carrying Value	3,502,908	1,883,021
Cash and Cash Equivalents, at Carrying Value, Total	3,571,053	1,928,916
Accounts Receivable [Abstract]
Accounts Receivable, before Allowance for Credit Loss, Current	770,177	735,734
Accounts Receivable, Allowance for Credit Loss, Current	(31,024)	(32,324)
Other Receivables	208,328	242,402
Unbilled Receivables, Current	484,672	524,420
Accounts and Other Receivables, Net, Current	1,432,153	1,470,232
Deferred Fuel Cost	348,181	54,133
Energy Related Inventory	129,787	131,974
Public Utilities, Inventory	1,753,659	1,710,395
Prepaid Expense and Other Assets, Current	447,894	424,704
Deferred Nuclear Refueling Outage Costs	127,332	86,497
Assets, Current, Total	7,810,059	5,806,851
Assets, Noncurrent [Abstract]
Decommissioning Fund Investments	6,155,164	6,300,880
Property, Plant and Equipment, Net	479,706	481,590
Asset Recovery Damaged Property Costs, Noncurrent	311,550	308,784
Other Long-Term Investments	123,226	124,414
Long-Term Investments, Total	7,069,646	7,215,668
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Public Utilities, Property, Plant and Equipment, Electric	75,415,742	74,750,917
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	7,730,337	6,020,008
Public Utilities, Property, Plant and Equipment, Fuel	838,825	834,690
Public Utilities, Property, Plant and Equipment, Plant in Service, Total	83,984,904	81,605,615
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	29,095,973	28,751,001
Public Utilities, Property, Plant and Equipment, Net, Total	54,888,931	52,854,614
Regulatory Asset [Abstract]
Regulatory Asset, Noncurrent	4,890,744	5,005,976
Deferred Fuel Cost, Noncurrent	172,201	172,201
Goodwill	367,582	367,582
Deferred Income Tax Assets, Net	22,807	15,540
Other Assets, Noncurrent	582,170	452,298
Deferred Costs and Other Assets	6,035,504	6,013,597
Assets, Total	75,804,140	71,890,730
Liabilities, Current [Abstract]
Long-Term Debt, Current Maturities	1,525,174	2,375,140
Short-Term Debt	1,382,354	657,774
Accounts Payable, Current	2,748,819	2,565,546
Contract with Customer, Refund Liability, Current	485,236	479,796
Taxes Payable, Current	415,455	525,189
Interest Payable, Current	332,904	285,657
Deferred Fuel Costs Current Liabilities	0	14,562
Liability, Defined Benefit Plan, Current	62,170	63,214
Other Liabilities, Current	227,190	223,240
Liabilities, Current, Total	8,159,972	7,822,968
Liabilities, Noncurrent [Abstract]
Deferred Income Taxes and Other Tax Liabilities, Noncurrent	5,720,550	5,592,681
Accumulated Deferred Investment Tax Credit	185,123	187,173
Regulatory Liability For Income Taxes - Net	1,047,465	1,079,699
Regulatory Liability, Noncurrent	3,559,742	3,911,839
Customer Advances, Noncurrent Liabilities	152,198	35,000
Asset Retirement Obligations, Noncurrent	5,004,090	4,947,530
Loss Contingency Accrual	463,087	495,779
Liability, Defined Benefit Plan, Noncurrent	98,709	113,930
Long-Term Debt, Excluding Current Maturities	31,150,915	27,902,021
Deferred Credits and Other Liabilities	938,822	953,078
Liabilities, Noncurrent, Total	49,986,615	46,834,185
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	5,878	5,832
Additional Paid in Capital, Common Stock	9,275,093	8,979,387
Retained Earnings (Accumulated Deficit)	12,790,485	12,698,436
Accumulated Other Comprehensive Income (Loss), Net of Tax	905	(3,006)
Treasury Stock, Value	4,725,620	4,757,573
Equity, Attributable to Parent, Total	17,346,741	16,923,076
Equity, Attributable to Noncontrolling Interest	91,402	91,091
Equity, Including Portion Attributable to Noncontrolling Interest, Total	17,438,143	17,014,167
Liabilities and Equity, Total	75,804,140	71,890,730
Customer Advances, Current Liabilities	980,670	632,850
Customer advances for construction, noncurrent	$ 1,665,914	$ 1,615,455
Common Stock, Shares, Issued	587,817,564	583,203,774
Entergy Arkansas [Member]
Cash and Cash Equivalents [Abstract]
Cash	$ 14,056	$ 7,048
Cash Equivalents, at Carrying Value	563,429	268,522
Cash and Cash Equivalents, at Carrying Value, Total	577,485	275,570
Accounts Receivable [Abstract]
Accounts Receivable, Allowance for Credit Loss, Current	(7,422)	(7,303)
Other Receivables	62,461	87,029
Unbilled Receivables, Current	110,454	130,950
Accounts and Other Receivables, Net, Current	394,768	418,831
Deferred Fuel Cost	110,419	27,704
Energy Related Inventory	58,974	39,382
Public Utilities, Inventory	437,349	430,662
Prepaid Expense and Other Assets, Current	93,177	98,975
Deferred Nuclear Refueling Outage Costs	50,583	36,718
Assets, Current, Total	1,722,755	1,327,842
Assets, Noncurrent [Abstract]
Decommissioning Fund Investments	1,775,547	1,816,331
Other Long-Term Investments	792	793
Long-Term Investments, Total	1,776,339	1,817,124
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Public Utilities, Property, Plant and Equipment, Electric	17,113,427	17,022,476
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	896,571	621,218
Public Utilities, Property, Plant and Equipment, Fuel	263,993	302,706
Public Utilities, Property, Plant and Equipment, Plant in Service, Total	18,273,991	17,946,400
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	6,675,317	6,585,693
Public Utilities, Property, Plant and Equipment, Net, Total	11,598,674	11,360,707
Regulatory Asset [Abstract]
Regulatory Asset, Noncurrent	1,647,162	1,743,848
Other Assets, Noncurrent	238,133	221,381
Deferred Costs and Other Assets	1,885,295	1,965,229
Assets, Total	16,983,063	16,470,902
Liabilities, Current [Abstract]
Long-Term Debt, Current Maturities	90,000	690,000
Contract with Customer, Refund Liability, Current	137,675	136,587
Taxes Payable, Current	108,028	114,993
Interest Payable, Current	71,780	39,709
Other Liabilities, Current	55,940	56,083
Liabilities, Current, Total	874,968	1,487,324
Liabilities, Noncurrent [Abstract]
Deferred Income Taxes and Other Tax Liabilities, Noncurrent	1,894,418	1,846,713
Accumulated Deferred Investment Tax Credit	24,568	24,868
Regulatory Liability For Income Taxes - Net	421,183	422,740
Regulatory Liability, Noncurrent	899,389	1,044,060
Customer Advances, Noncurrent Liabilities	58,700	10,000
Asset Retirement Obligations, Noncurrent	1,811,290	1,791,372
Loss Contingency Accrual	81,803	85,539
Long-Term Debt, Excluding Current Maturities	5,767,752	4,733,604
Deferred Credits and Other Liabilities	356,183	314,495
Liabilities, Noncurrent, Total	11,315,286	10,273,391
Commitments and Contingencies
Common Shareholders Equity [Abstract]
Members' Equity	4,781,480	4,699,369
Equity, Attributable to Noncontrolling Interest	11,329	10,818
Equity, Including Portion Attributable to Noncontrolling Interest, Total	4,792,809	4,710,187
Liabilities and Equity, Total	16,983,063	16,470,902
Entergy Arkansas [Member] | Affiliated Entity [Member]
Accounts Receivable [Abstract]
Accounts Receivable, before Allowance for Credit Loss, Current	72,046	43,859
Liabilities, Current [Abstract]
Accounts Payable, Current	31,666	103,411
Entergy Arkansas [Member] | Nonrelated Party [Member]
Accounts Receivable [Abstract]
Accounts Receivable, before Allowance for Credit Loss, Current	157,229	164,296
Liabilities, Current [Abstract]
Accounts Payable, Current	379,879	346,541
Entergy Louisiana [Member]
Cash and Cash Equivalents [Abstract]
Cash	295	237
Cash Equivalents, at Carrying Value	1,238,715	776,724
Cash and Cash Equivalents, at Carrying Value, Total	1,239,010	776,961
Accounts Receivable [Abstract]
Accounts Receivable, Allowance for Credit Loss, Current	(9,796)	(9,069)
Other Receivables	40,358	50,471
Unbilled Receivables, Current	195,909	194,429
Accounts and Other Receivables, Net, Current	725,612	693,108
Deferred Fuel Cost	146,820	15,672
Energy Related Inventory	22,896	35,968
Public Utilities, Inventory	839,090	792,217
Prepaid Expense and Other Assets, Current	241,158	187,832
Deferred Nuclear Refueling Outage Costs	31,095	40,683
Assets, Current, Total	3,245,681	2,542,441
Assets, Noncurrent [Abstract]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	3,916,792	4,007,919
Decommissioning Fund Investments	2,690,316	2,753,828
Property, Plant and Equipment, Net	457,906	459,706
Asset Recovery Damaged Property Costs, Noncurrent	237,070	234,961
Other Long-Term Investments	10,182	10,132
Long-Term Investments, Total	7,312,266	7,466,546
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Public Utilities, Property, Plant and Equipment, Electric	30,747,930	30,408,352
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	2,965,214	2,031,650
Public Utilities, Property, Plant and Equipment, Fuel	275,113	323,052
Public Utilities, Property, Plant and Equipment, Plant in Service, Total	33,988,257	32,763,054
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	11,413,715	11,275,981
Public Utilities, Property, Plant and Equipment, Net, Total	22,574,542	21,487,073
Regulatory Asset [Abstract]
Regulatory Asset, Noncurrent	1,596,354	1,540,709
Deferred Fuel Cost, Noncurrent	168,122	168,122
Other Assets, Noncurrent	148,903	132,679
Deferred Costs and Other Assets	1,913,379	1,841,510
Assets, Total	35,045,868	33,337,570
Liabilities, Current [Abstract]
Long-Term Debt, Current Maturities	470,000	720,000
Contract with Customer, Refund Liability, Current	175,202	172,594
Taxes Payable, Current	42,826	64,793
Interest Payable, Current	70,021	126,349
Other Liabilities, Current	87,468	94,876
Liabilities, Current, Total	2,689,641	2,575,409
Liabilities, Noncurrent [Abstract]
Deferred Income Taxes and Other Tax Liabilities, Noncurrent	3,244,474	3,093,218
Accumulated Deferred Investment Tax Credit	83,074	84,177
Regulatory Liability For Income Taxes - Net	295,562	312,684
Regulatory Liability, Noncurrent	1,523,530	1,630,763
Asset Retirement Obligations, Noncurrent	1,956,704	1,932,412
Loss Contingency Accrual	266,087	260,660
Liability, Defined Benefit Plan, Noncurrent	157,792	159,075
Long-Term Debt, Excluding Current Maturities	11,109,539	9,646,835
Deferred Credits and Other Liabilities	533,181	558,621
Liabilities, Noncurrent, Total	20,151,161	18,830,975
Commitments and Contingencies
Common Shareholders Equity [Abstract]
Members' Equity	12,132,242	11,857,063
Equity, Attributable to Noncontrolling Interest	39,995	40,207
Accumulated Other Comprehensive Income (Loss), Net of Tax	32,829	33,916
Equity, Including Portion Attributable to Noncontrolling Interest, Total	12,205,066	11,931,186
Liabilities and Equity, Total	35,045,868	33,337,570
Customer Advances, Current Liabilities	705,134	543,312
Customer advances for construction, noncurrent	981,218	1,152,530
Entergy Louisiana [Member] | Affiliated Entity [Member]
Accounts Receivable [Abstract]
Accounts Receivable, before Allowance for Credit Loss, Current	163,893	164,911
Liabilities, Current [Abstract]
Accounts Payable, Current	61,625	92,126
Entergy Louisiana [Member] | Nonrelated Party [Member]
Accounts Receivable [Abstract]
Accounts Receivable, before Allowance for Credit Loss, Current	335,248	292,366
Liabilities, Current [Abstract]
Accounts Payable, Current	1,077,365	761,359
Entergy Mississippi [Member]
Cash and Cash Equivalents [Abstract]
Cash	34	27
Cash Equivalents, at Carrying Value	1,082,996	341,457
Cash and Cash Equivalents, at Carrying Value, Total	1,083,030	341,484
Accounts Receivable [Abstract]
Accounts Receivable, Allowance for Credit Loss, Current	(3,311)	(3,509)
Other Receivables	20,141	20,641
Unbilled Receivables, Current	77,614	90,235
Accounts and Other Receivables, Net, Current	326,334	260,903
Deferred Fuel Cost	60,605	10,757
Energy Related Inventory	14,445	18,481
Public Utilities, Inventory	114,093	112,082
Prepaid Expense and Other Assets, Current	52,248	36,911
Assets, Current, Total	1,650,755	780,618
Assets, Noncurrent [Abstract]
Property, Plant and Equipment, Net	4,463	4,467
Other Long-Term Investments	739	864
Long-Term Investments, Total	5,202	5,331
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Public Utilities, Property, Plant and Equipment, Electric	8,398,181	8,366,079
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	1,792,893	1,396,075
Public Utilities, Property, Plant and Equipment, Plant in Service, Total	10,191,074	9,762,154
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	2,677,591	2,635,823
Public Utilities, Property, Plant and Equipment, Net, Total	7,513,483	7,126,331
Regulatory Asset [Abstract]
Regulatory Asset, Noncurrent	464,191	455,714
Other Assets, Noncurrent	114,636	108,480
Deferred Costs and Other Assets	578,827	564,194
Assets, Total	9,748,267	8,476,474
Liabilities, Current [Abstract]
Contract with Customer, Refund Liability, Current	98,488	97,875
Taxes Payable, Current	71,100	163,220
Interest Payable, Current	54,194	28,467
Other Liabilities, Current	27,675	23,678
Liabilities, Current, Total	979,993	861,669
Liabilities, Noncurrent [Abstract]
Deferred Income Taxes and Other Tax Liabilities, Noncurrent	931,048	926,734
Accumulated Deferred Investment Tax Credit	13,085	13,191
Regulatory Liability For Income Taxes - Net	169,181	170,902
Regulatory Liability, Noncurrent	151,993	144,124
Customer Advances, Noncurrent Liabilities	93,498	25,000
Asset Retirement Obligations, Noncurrent	26,908	26,538
Loss Contingency Accrual	20,728	51,564
Long-Term Debt, Excluding Current Maturities	3,666,037	3,021,324
Deferred Credits and Other Liabilities	64,849	67,648
Liabilities, Noncurrent, Total	5,502,740	4,631,589
Commitments and Contingencies
Common Shareholders Equity [Abstract]
Members' Equity	3,260,456	2,978,150
Equity, Attributable to Noncontrolling Interest	5,078	5,066
Equity, Including Portion Attributable to Noncontrolling Interest, Total	3,265,534	2,983,216
Liabilities and Equity, Total	9,748,267	8,476,474
Customer Advances, Current Liabilities	275,536	89,538
Customer advances for construction, noncurrent	365,413	184,564
Entergy Mississippi [Member] | Affiliated Entity [Member]
Accounts Receivable [Abstract]
Accounts Receivable, before Allowance for Credit Loss, Current	104,967	37,723
Liabilities, Current [Abstract]
Accounts Payable, Current	49,767	61,135
Entergy Mississippi [Member] | Nonrelated Party [Member]
Accounts Receivable [Abstract]
Accounts Receivable, before Allowance for Credit Loss, Current	126,923	115,813
Liabilities, Current [Abstract]
Accounts Payable, Current	403,233	397,756
Entergy New Orleans [Member]
Cash and Cash Equivalents [Abstract]
Cash	29	26
Cash Equivalents, at Carrying Value	68,941	110,238
Cash and Cash Equivalents, at Carrying Value, Total	68,970	110,264
Accounts Receivable [Abstract]
Accounts Receivable, Allowance for Credit Loss, Current	(3,019)	(3,845)
Other Receivables	1,699	3,668
Unbilled Receivables, Current	24,322	28,303
Accounts and Other Receivables, Net, Current	83,921	94,557
Deferred Fuel Cost	9,438	0
Energy Related Inventory	1,231	816
Public Utilities, Inventory	35,311	30,539
Prepaid Expense and Other Assets, Current	25,207	12,992
Assets, Current, Total	224,078	249,168
Assets, Noncurrent [Abstract]
Asset Recovery Damaged Property Costs, Noncurrent	74,480	73,822
Other Long-Term Investments	9,374	9,485
Long-Term Investments, Total	83,854	83,307
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Public Utilities, Property, Plant and Equipment, Electric	2,282,592	2,267,691
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	55,499	43,055
Public Utilities, Property, Plant and Equipment, Plant in Service, Total	2,338,091	2,310,746
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	789,884	778,401
Public Utilities, Property, Plant and Equipment, Net, Total	1,548,207	1,532,345
Regulatory Asset [Abstract]
Regulatory Asset, Noncurrent	108,629	109,690
Deferred Fuel Cost, Noncurrent	4,080	4,080
Other Assets, Noncurrent	84,039	80,090
Deferred Costs and Other Assets	196,748	193,860
Assets, Total	2,052,887	2,058,680
Liabilities, Current [Abstract]
Long-Term Debt, Current Maturities	85,000	85,000
Contract with Customer, Refund Liability, Current	30,902	30,632
Taxes Payable, Current	23,065	16,336
Interest Payable, Current	8,804	6,829
Deferred Fuel Costs Current Liabilities	0	3,209
Other Liabilities, Current	10,350	10,659
Liabilities, Current, Total	231,438	233,161
Liabilities, Noncurrent [Abstract]
Deferred Income Taxes and Other Tax Liabilities, Noncurrent	197,878	201,345
Accumulated Deferred Investment Tax Credit	15,402	15,425
Regulatory Liability For Income Taxes - Net	13,102	15,656
Regulatory Liability, Noncurrent	308,068	312,962
Loss Contingency Accrual	79,354	78,933
Long-Term Debt, Excluding Current Maturities	565,963	565,985
Deferred Credits and Other Liabilities	22,142	22,057
Liabilities, Noncurrent, Total	1,207,053	1,217,507
Commitments and Contingencies
Common Shareholders Equity [Abstract]
Members' Equity	614,396	608,012
Equity, Including Portion Attributable to Noncontrolling Interest, Total	614,396	608,012
Liabilities and Equity, Total	2,052,887	2,058,680
Entergy New Orleans [Member] | Affiliated Entity [Member]
Accounts Receivable [Abstract]
Accounts Receivable, before Allowance for Credit Loss, Current	6,671	10,459
Liabilities, Current [Abstract]
Notes Payable, Current	720	720
Accounts Payable, Current	38,923	47,709
Liabilities, Noncurrent [Abstract]
Notes Payable, Noncurrent	5,144	5,144
Entergy New Orleans [Member] | Nonrelated Party [Member]
Accounts Receivable [Abstract]
Accounts Receivable, before Allowance for Credit Loss, Current	54,248	55,972
Liabilities, Current [Abstract]
Accounts Payable, Current	33,674	32,067
Entergy Texas [Member]
Cash and Cash Equivalents [Abstract]
Cash	201	200
Cash Equivalents, at Carrying Value	433,763	274,908
Cash and Cash Equivalents, at Carrying Value, Total	433,964	275,108
Other Restricted Assets, Current	7,207	1,480
Accounts Receivable [Abstract]
Accounts Receivable, Allowance for Credit Loss, Current	(7,475)	(8,598)
Other Receivables	69,094	67,400
Unbilled Receivables, Current	76,373	80,503
Accounts and Other Receivables, Net, Current	276,637	275,339
Deferred Fuel Cost	20,900	0
Energy Related Inventory	26,823	30,833
Public Utilities, Inventory	180,910	190,322
Prepaid Expense and Other Assets, Current	47,351	49,161
Assets, Current, Total	993,792	822,243
Assets, Noncurrent [Abstract]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	42	56
Other Long-Term Investments	15,685	15,607
Long-Term Investments, Total	15,727	15,663
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Public Utilities, Property, Plant and Equipment, Electric	9,571,760	9,491,159
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	1,892,286	1,761,028
Public Utilities, Property, Plant and Equipment, Plant in Service, Total	11,464,046	11,252,187
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	2,812,791	2,764,308
Public Utilities, Property, Plant and Equipment, Net, Total	8,651,255	8,487,879
Regulatory Asset [Abstract]
Regulatory Asset, Noncurrent	495,836	510,806
Other Assets, Noncurrent	203,851	191,555
Deferred Costs and Other Assets	699,687	702,361
Assets, Total	10,360,461	10,028,146
Liabilities, Current [Abstract]
Long-Term Debt, Current Maturities	130,000	130,000
Contract with Customer, Refund Liability, Current	42,970	42,109
Taxes Payable, Current	82,572	87,180
Interest Payable, Current	24,932	41,907
Deferred Fuel Costs Current Liabilities	0	11,353
Other Liabilities, Current	16,092	16,801
Liabilities, Current, Total	830,369	921,141
Liabilities, Noncurrent [Abstract]
Deferred Income Taxes and Other Tax Liabilities, Noncurrent	926,065	947,067
Accumulated Deferred Investment Tax Credit	6,320	6,467
Regulatory Liability For Income Taxes - Net	51,375	57,755
Regulatory Liability, Noncurrent	155,907	138,969
Asset Retirement Obligations, Noncurrent	15,302	15,097
Loss Contingency Accrual	12,600	13,558
Long-Term Debt, Excluding Current Maturities	3,900,768	3,900,188
Deferred Credits and Other Liabilities	125,627	129,693
Liabilities, Noncurrent, Total	5,193,964	5,208,794
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	1,790,125	1,425,125
Retained Earnings (Accumulated Deficit)	2,457,801	2,384,884
Equity, Attributable to Parent, Total	4,297,378	3,859,461
Equity, Including Portion Attributable to Noncontrolling Interest, Total	4,336,128	3,898,211
Liabilities and Equity, Total	$ 10,360,461	$ 10,028,146
Common Stock, Shares, Issued	46,525,000	46,525,000
Entergy Texas [Member] | Affiliated Entity [Member]
Accounts Receivable [Abstract]
Accounts Receivable, before Allowance for Credit Loss, Current	$ 42,117	$ 28,747
Liabilities, Current [Abstract]
Accounts Payable, Current	59,290	73,178
Entergy Texas [Member] | Nonrelated Party [Member]
Accounts Receivable [Abstract]
Accounts Receivable, before Allowance for Credit Loss, Current	96,528	107,287
Liabilities, Current [Abstract]
Accounts Payable, Current	474,513	518,613
System Energy [Member]
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents, at Carrying Value, Total	122	56
Accounts Receivable [Abstract]
Accounts Receivable, before Allowance for Credit Loss, Current	34,872	65,083
Other Receivables	8,134	6,833
Accounts and Other Receivables, Net, Current	43,006	71,916
Public Utilities, Inventory	142,180	149,847
Prepaid Expense and Other Assets, Current	8,053	5,101
Deferred Nuclear Refueling Outage Costs	45,655	9,096
Prepaid Taxes	1,004	0
Assets, Current, Total	240,020	236,016
Assets, Noncurrent [Abstract]
Decommissioning Fund Investments	1,689,301	1,730,722
Long-Term Investments, Total	1,689,301	1,730,722
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Public Utilities, Property, Plant and Equipment, Electric	5,865,578	5,753,963
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	83,472	123,172
Public Utilities, Property, Plant and Equipment, Fuel	299,718	208,932
Public Utilities, Property, Plant and Equipment, Plant in Service, Total	6,248,768	6,086,067
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	3,692,666	3,679,886
Public Utilities, Property, Plant and Equipment, Net, Total	2,556,102	2,406,181
Regulatory Asset [Abstract]
Regulatory Asset, Noncurrent	538,759	601,185
Other Assets, Noncurrent	36,640	34,301
Deferred Costs and Other Assets	575,399	635,486
Assets, Total	5,060,822	5,008,405
Liabilities, Current [Abstract]
Long-Term Debt, Current Maturities	174	140
Taxes Payable, Current	0	11,685
Interest Payable, Current	21,849	13,215
Other Liabilities, Current	4,352	4,089
Liabilities, Current, Total	144,309	121,268
Liabilities, Noncurrent [Abstract]
Deferred Income Taxes and Other Tax Liabilities, Noncurrent	631,124	625,165
Accumulated Deferred Investment Tax Credit	42,675	43,045
Regulatory Liability For Income Taxes - Net	97,062	99,960
Regulatory Liability, Noncurrent	777,194	897,301
Asset Retirement Obligations, Noncurrent	1,184,567	1,172,967
Long-Term Debt, Excluding Current Maturities	1,194,478	1,088,563
Deferred Credits and Other Liabilities	6,263	2
Liabilities, Noncurrent, Total	3,933,363	3,927,003
Commitments and Contingencies
Common Stock, No Par Value	$ 0	$ 0
Common Shareholders Equity [Abstract]
Common Stock, Value, Issued	$ 908,944	$ 908,944
Retained Earnings (Accumulated Deficit)	74,206	51,190
Equity, Including Portion Attributable to Noncontrolling Interest, Total	983,150	960,134
Liabilities and Equity, Total	$ 5,060,822	$ 5,008,405
Common Stock, Shares, Issued	789,350	789,350
System Energy [Member] | Affiliated Entity [Member]
Liabilities, Current [Abstract]
Accounts Payable, Current	$ 17,706	$ 25,528
System Energy [Member] | Nonrelated Party [Member]
Liabilities, Current [Abstract]
Accounts Payable, Current	$ 100,228	$ 66,611