v3.26.1
Consolidated Balance Sheets - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Cash and Cash Equivalents [Abstract]      
Cash $ 118,189   $ 45,895
Cash Equivalents, at Carrying Value 3,735,856   1,883,021
Cash and Cash Equivalent, Total 3,854,045   1,928,916
Accounts Receivable [Abstract]      
Accounts Receivable, before Allowance for Credit Loss, Current 872,618   735,734
Accounts Receivable, Allowance for Credit Loss, Current (29,436)   (32,324)
Other Receivables 230,059   242,402
Unbilled Receivables, Current 635,234   524,420
Accounts and Other Receivables, Net, Current 1,708,475   1,470,232
Deferred Fuel Cost 192,004   54,133
Energy Related Inventory 137,653   131,974
Public Utilities, Inventory 1,784,544   1,710,395
Prepaid Expense and Other Assets, Current 402,260   424,704
Deferred Nuclear Refueling Outage Costs 125,220   86,497
Assets, Current, Total 8,204,201   5,806,851
Assets, Noncurrent [Abstract]      
Decommissioning Fund Investments 6,722,325   6,300,880
Property, Plant and Equipment, Net 479,919   481,590
Asset Recovery Damaged Property Costs, Noncurrent 314,335   308,784
Other Long-Term Investments 128,794   124,414
Long-Term Investments, Total 7,645,373   7,215,668
Public Utilities, Property, Plant and Equipment, Net [Abstract]      
Public Utilities, Property, Plant and Equipment, Electric 76,545,871   74,750,917
Public Utilities, Property, Plant and Equipment, Construction Work in Progress 9,018,853   6,020,008
Public Utilities, Property, Plant and Equipment, Fuel 809,430   834,690
Public Utilities, Property, Plant and Equipment, Plant in Service, Total 86,374,154   81,605,615
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation 29,250,718   28,751,001
Public Utilities, Property, Plant and Equipment, Net, Total 57,123,436   52,854,614
Regulatory Asset [Abstract]      
Regulatory Asset, Noncurrent 4,871,706   5,005,976
Deferred Fuel Cost, Noncurrent 172,201   172,201
Goodwill 367,582   367,582
Deferred Income Tax Assets, Net 29,719   15,540
Other Assets, Noncurrent 588,400   452,298
Deferred Costs and Other Assets 6,029,608   6,013,597
Assets, Total 79,002,618   71,890,730
Liabilities, Current [Abstract]      
Long-Term Debt, Current Maturities 1,510,174   2,375,140
Short-Term Debt 1,569,496   657,774
Accounts Payable, Current 2,716,222   2,565,546
Contract with Customer, Refund Liability, Current 491,361   479,796
Taxes Payable, Current 537,390   525,189
Interest Payable, Current 331,165   285,657
Deferred Fuel Costs, Current Liability 20,861   14,562
Liability, Defined Benefit Plan, Current 61,365   63,214
Other Liabilities, Current 290,501   223,240
Liabilities, Current, Total 8,998,591   7,822,968
Liabilities, Noncurrent [Abstract]      
Deferred Income Taxes and Other Tax Liabilities, Noncurrent 5,875,664   5,592,681
Accumulated Deferred Investment Tax Credit 183,073   187,173
Regulatory liability for income taxes - net 1,034,742   1,079,699
Regulatory Liability, Noncurrent 3,989,788   3,911,839
Customer Advances, Noncurrent Liabilities 170,298   35,000
Asset Retirement Obligations, Noncurrent 5,063,544   4,947,530
Loss Contingency Accrual 472,169   495,779
Liability, Defined Benefit Plan, Noncurrent 88,612   113,930
Long-Term Debt, Excluding Current Maturities 31,547,652   27,902,021
Deferred Credits and Other Liabilities 952,030   953,078
Liabilities, Noncurrent, Total 51,463,931   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 5,965   5,832
Additional Paid in Capital 9,966,490   8,979,387
Retained Earnings (Accumulated Deficit) 12,980,060   12,698,436
Accumulated Other Comprehensive Income (Loss), Net of Tax (1,090) $ 34,438 (3,006)
Treasury Stock, Value 4,722,305   4,757,573
Equity, Attributable to Parent, Total 18,229,120   16,923,076
Subsidiaries’ Preferred Stock Value and Equity Attributable to Noncontrolling Interests 91,566   91,091
Equity, Including Portion Attributable to Noncontrolling Interest, Total 18,320,686 16,308,940 17,014,167
Liabilities and Equity, Total 79,002,618   71,890,730
Customer Advances, Current Liabilities 1,470,056   632,850
Customer advances for construction, noncurrent $ 2,086,359   $ 1,615,455
Common Stock, Shares, Issued 596,525,807   583,203,774
Entergy Arkansas [Member]      
Cash and Cash Equivalents [Abstract]      
Cash $ 3,892   $ 7,048
Cash Equivalents, at Carrying Value 504,824   268,522
Cash and Cash Equivalent, Total 508,716   275,570
Accounts Receivable [Abstract]      
Accounts Receivable, Allowance for Credit Loss, Current (6,566)   (7,303)
Other Receivables 75,152   87,029
Unbilled Receivables, Current 158,222   130,950
Accounts and Other Receivables, Net, Current 470,893   418,831
Deferred Fuel Cost 128,781   27,704
Energy Related Inventory 54,730   39,382
Public Utilities, Inventory 440,038   430,662
Prepaid Expense and Other Assets, Current 77,894   98,975
Deferred Nuclear Refueling Outage Costs 59,523   36,718
Assets, Current, Total 1,740,575   1,327,842
Assets, Noncurrent [Abstract]      
Decommissioning Fund Investments 1,933,464   1,816,331
Other Long-Term Investments 791   793
Long-Term Investments, Total 1,934,255   1,817,124
Public Utilities, Property, Plant and Equipment, Net [Abstract]      
Public Utilities, Property, Plant and Equipment, Electric 17,345,424   17,022,476
Public Utilities, Property, Plant and Equipment, Construction Work in Progress 1,137,464   621,218
Public Utilities, Property, Plant and Equipment, Fuel 255,255   302,706
Public Utilities, Property, Plant and Equipment, Plant in Service, Total 18,738,143   17,946,400
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation 6,683,410   6,585,693
Public Utilities, Property, Plant and Equipment, Net, Total 12,054,733   11,360,707
Regulatory Asset [Abstract]      
Regulatory Asset, Noncurrent 1,660,397   1,743,848
Other Assets, Noncurrent 248,445   221,381
Deferred Costs and Other Assets 1,908,842   1,965,229
Assets, Total 17,638,405   16,470,902
Liabilities, Current [Abstract]      
Long-Term Debt, Current Maturities 90,000   690,000
Contract with Customer, Refund Liability, Current 139,439   136,587
Taxes Payable, Current 82,636   114,993
Interest Payable, Current 59,582   39,709
Other Liabilities, Current 77,309   56,083
Liabilities, Current, Total 907,750   1,487,324
Liabilities, Noncurrent [Abstract]      
Deferred Income Taxes and Other Tax Liabilities, Noncurrent 1,901,775   1,846,713
Accumulated Deferred Investment Tax Credit 24,267   24,868
Regulatory liability for income taxes - net 437,792   422,740
Regulatory Liability, Noncurrent 1,080,012   1,044,060
Customer Advances, Noncurrent Liabilities 76,800   10,000
Asset Retirement Obligations, Noncurrent 1,836,999   1,791,372
Loss Contingency Accrual 85,169   85,539
Long-Term Debt, Excluding Current Maturities 5,751,909   4,733,604
Deferred Credits and Other Liabilities 457,836   314,495
Liabilities, Noncurrent, Total 11,652,559   10,273,391
Commitments and Contingencies  
Common Shareholders Equity [Abstract]      
Members' Equity 5,067,015   4,699,369
Equity, Attributable to Noncontrolling Interest 11,081   10,818
Equity, Including Portion Attributable to Noncontrolling Interest, Total 5,078,096 4,649,265 4,710,187
Liabilities and Equity, Total 17,638,405   16,470,902
Entergy Arkansas [Member] | Affiliated Entity [Member]      
Accounts Receivable [Abstract]      
Accounts Receivable, before Allowance for Credit Loss, Current 68,696   43,859
Liabilities, Current [Abstract]      
Accounts Payable, Current 55,354   103,411
Entergy Arkansas [Member] | Nonrelated Party [Member]      
Accounts Receivable [Abstract]      
Accounts Receivable, before Allowance for Credit Loss, Current 175,389   164,296
Liabilities, Current [Abstract]      
Accounts Payable, Current 403,430   346,541
Entergy Louisiana [Member]      
Cash and Cash Equivalents [Abstract]      
Cash 379   237
Cash Equivalents, at Carrying Value 1,567,652   776,724
Cash and Cash Equivalent, Total 1,568,031   776,961
Accounts Receivable [Abstract]      
Accounts Receivable, Allowance for Credit Loss, Current (9,605)   (9,069)
Other Receivables 43,009   50,471
Unbilled Receivables, Current 235,825   194,429
Accounts and Other Receivables, Net, Current 844,945   693,108
Deferred Fuel Cost 0   15,672
Energy Related Inventory 31,563   35,968
Public Utilities, Inventory 856,020   792,217
Prepaid Expense and Other Assets, Current 291,045   187,832
Deferred Nuclear Refueling Outage Costs 22,410   40,683
Assets, Current, Total 3,614,014   2,542,441
Assets, Noncurrent [Abstract]      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures 3,884,044   4,007,919
Decommissioning Fund Investments 2,944,386   2,753,828
Property, Plant and Equipment, Net 458,296   459,706
Asset Recovery Damaged Property Costs, Noncurrent 239,189   234,961
Other Long-Term Investments 10,220   10,132
Long-Term Investments, Total 7,536,135   7,466,546
Public Utilities, Property, Plant and Equipment, Net [Abstract]      
Public Utilities, Property, Plant and Equipment, Electric 31,437,940   30,408,352
Public Utilities, Property, Plant and Equipment, Construction Work in Progress 3,604,096   2,031,650
Public Utilities, Property, Plant and Equipment, Fuel 267,784   323,052
Public Utilities, Property, Plant and Equipment, Plant in Service, Total 35,309,820   32,763,054
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation 11,507,910   11,275,981
Public Utilities, Property, Plant and Equipment, Net, Total 23,801,910   21,487,073
Regulatory Asset [Abstract]      
Regulatory Asset, Noncurrent 1,560,175   1,540,709
Deferred Fuel Cost, Noncurrent 168,122   168,122
Other Assets, Noncurrent 150,051   132,679
Deferred Costs and Other Assets 1,878,348   1,841,510
Assets, Total 36,830,407   33,337,570
Liabilities, Current [Abstract]      
Long-Term Debt, Current Maturities 540,000   720,000
Contract with Customer, Refund Liability, Current 176,776   172,594
Taxes Payable, Current 99,695   64,793
Interest Payable, Current 144,803   126,349
Deferred Fuel Costs, Current Liability 20,450   0
Other Liabilities, Current 123,496   94,876
Liabilities, Current, Total 3,678,154   2,575,409
Liabilities, Noncurrent [Abstract]      
Deferred Income Taxes and Other Tax Liabilities, Noncurrent 3,335,894   3,093,218
Accumulated Deferred Investment Tax Credit 81,970   84,177
Regulatory liability for income taxes - net 279,489   312,684
Regulatory Liability, Noncurrent 1,609,956   1,630,763
Asset Retirement Obligations, Noncurrent 1,981,306   1,932,412
Loss Contingency Accrual 266,551   260,660
Liability, Defined Benefit Plan, Noncurrent 156,781   159,075
Long-Term Debt, Excluding Current Maturities 11,024,821   9,646,835
Deferred Credits and Other Liabilities 600,214   558,621
Liabilities, Noncurrent, Total 20,635,854   18,830,975
Commitments and Contingencies  
Common Shareholders Equity [Abstract]      
Members' Equity 12,444,302   11,857,063
Equity, Attributable to Noncontrolling Interest 40,356   40,207
Accumulated Other Comprehensive Income (Loss), Net of Tax 31,741 50,555 33,916
Equity, Including Portion Attributable to Noncontrolling Interest, Total 12,516,399 11,654,437 11,931,186
Liabilities and Equity, Total 36,830,407   33,337,570
Customer Advances, Current Liabilities 1,209,529   543,312
Customer advances for construction, noncurrent 1,298,872   1,152,530
Entergy Louisiana [Member] | Affiliated Entity [Member]      
Accounts Receivable [Abstract]      
Accounts Receivable, before Allowance for Credit Loss, Current 202,618   164,911
Liabilities, Current [Abstract]      
Accounts Payable, Current 84,017   92,126
Entergy Louisiana [Member] | Nonrelated Party [Member]      
Accounts Receivable [Abstract]      
Accounts Receivable, before Allowance for Credit Loss, Current 373,098   292,366
Liabilities, Current [Abstract]      
Accounts Payable, Current 1,279,388   761,359
Entergy Mississippi [Member]      
Cash and Cash Equivalents [Abstract]      
Cash 1,136   27
Cash Equivalents, at Carrying Value 829,790   341,457
Cash and Cash Equivalent, Total 830,926   341,484
Accounts Receivable [Abstract]      
Accounts Receivable, Allowance for Credit Loss, Current (4,110)   (3,509)
Other Receivables 15,828   20,641
Unbilled Receivables, Current 102,867   90,235
Accounts and Other Receivables, Net, Current 342,746   260,903
Deferred Fuel Cost 52,217   10,757
Energy Related Inventory 17,864   18,481
Public Utilities, Inventory 117,598   112,082
Prepaid Expense and Other Assets, Current 55,820   36,911
Assets, Current, Total 1,417,171   780,618
Assets, Noncurrent [Abstract]      
Property, Plant and Equipment, Net 4,460   4,467
Other Long-Term Investments 668   864
Long-Term Investments, Total 5,128   5,331
Public Utilities, Property, Plant and Equipment, Net [Abstract]      
Public Utilities, Property, Plant and Equipment, Electric 8,539,059   8,366,079
Public Utilities, Property, Plant and Equipment, Construction Work in Progress 2,040,127   1,396,075
Public Utilities, Property, Plant and Equipment, Plant in Service, Total 10,579,186   9,762,154
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation 2,710,633   2,635,823
Public Utilities, Property, Plant and Equipment, Net, Total 7,868,553   7,126,331
Regulatory Asset [Abstract]      
Regulatory Asset, Noncurrent 455,052   455,714
Other Assets, Noncurrent 118,576   108,480
Deferred Costs and Other Assets 573,628   564,194
Assets, Total 9,864,480   8,476,474
Liabilities, Current [Abstract]      
Contract with Customer, Refund Liability, Current 99,818   97,875
Taxes Payable, Current 129,766   163,220
Interest Payable, Current 40,743   28,467
Other Liabilities, Current 26,065   23,678
Liabilities, Current, Total 1,026,026   861,669
Liabilities, Noncurrent [Abstract]      
Deferred Income Taxes and Other Tax Liabilities, Noncurrent 949,590   926,734
Accumulated Deferred Investment Tax Credit 12,979   13,191
Regulatory liability for income taxes - net 167,155   170,902
Regulatory Liability, Noncurrent 151,574   144,124
Customer Advances, Noncurrent Liabilities 93,498   25,000
Asset Retirement Obligations, Noncurrent 27,283   26,538
Loss Contingency Accrual 23,971   51,564
Long-Term Debt, Excluding Current Maturities 3,666,384   3,021,324
Deferred Credits and Other Liabilities 62,841   67,648
Liabilities, Noncurrent, Total 5,468,744   4,631,589
Commitments and Contingencies  
Common Shareholders Equity [Abstract]      
Members' Equity 3,364,581   2,978,150
Equity, Attributable to Noncontrolling Interest 5,129   5,066
Equity, Including Portion Attributable to Noncontrolling Interest, Total 3,369,710 2,602,626 2,983,216
Liabilities and Equity, Total 9,864,480   8,476,474
Customer Advances, Current Liabilities 260,527   89,538
Customer advances for construction, noncurrent 313,469   184,564
Entergy Mississippi [Member] | Affiliated Entity [Member]      
Accounts Receivable [Abstract]      
Accounts Receivable, before Allowance for Credit Loss, Current 81,892   37,723
Liabilities, Current [Abstract]      
Accounts Payable, Current 59,081   61,135
Entergy Mississippi [Member] | Nonrelated Party [Member]      
Accounts Receivable [Abstract]      
Accounts Receivable, before Allowance for Credit Loss, Current 146,269   115,813
Liabilities, Current [Abstract]      
Accounts Payable, Current 410,026   397,756
Entergy New Orleans [Member]      
Cash and Cash Equivalents [Abstract]      
Cash 354   26
Cash Equivalents, at Carrying Value 63,312   110,238
Cash and Cash Equivalent, Total 63,666   110,264
Accounts Receivable [Abstract]      
Accounts Receivable, Allowance for Credit Loss, Current (2,189)   (3,845)
Other Receivables 5,322   3,668
Unbilled Receivables, Current 35,427   28,303
Accounts and Other Receivables, Net, Current 107,366   94,557
Energy Related Inventory 1,951   816
Public Utilities, Inventory 37,895   30,539
Prepaid Expense and Other Assets, Current 21,483   12,992
Assets, Current, Total 232,361   249,168
Assets, Noncurrent [Abstract]      
Asset Recovery Damaged Property Costs, Noncurrent 75,145   73,822
Other Long-Term Investments 9,263   9,485
Long-Term Investments, Total 84,408   83,307
Public Utilities, Property, Plant and Equipment, Net [Abstract]      
Public Utilities, Property, Plant and Equipment, Electric 2,299,446   2,267,691
Public Utilities, Property, Plant and Equipment, Construction Work in Progress 69,315   43,055
Public Utilities, Property, Plant and Equipment, Plant in Service, Total 2,368,761   2,310,746
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation 800,008   778,401
Public Utilities, Property, Plant and Equipment, Net, Total 1,568,753   1,532,345
Regulatory Asset [Abstract]      
Regulatory Asset, Noncurrent 115,051   109,690
Deferred Fuel Cost, Noncurrent 4,080   4,080
Other Assets, Noncurrent 85,017   80,090
Deferred Costs and Other Assets 204,148   193,860
Assets, Total 2,089,670   2,058,680
Liabilities, Current [Abstract]      
Long-Term Debt, Current Maturities 0   85,000
Contract with Customer, Refund Liability, Current 31,051   30,632
Taxes Payable, Current 26,971   16,336
Interest Payable, Current 5,870   6,829
Deferred Fuel Costs, Current Liability 411   3,209
Other Liabilities, Current 16,237   10,659
Liabilities, Current, Total 164,184   233,161
Liabilities, Noncurrent [Abstract]      
Deferred Income Taxes and Other Tax Liabilities, Noncurrent 200,785   201,345
Accumulated Deferred Investment Tax Credit 15,379   15,425
Regulatory liability for income taxes - net 11,269   15,656
Regulatory Liability, Noncurrent 303,695   312,962
Loss Contingency Accrual 80,240   78,933
Long-Term Debt, Excluding Current Maturities 655,357   565,985
Deferred Credits and Other Liabilities 23,839   22,057
Liabilities, Noncurrent, Total 1,295,708   1,217,507
Commitments and Contingencies  
Common Shareholders Equity [Abstract]      
Members' Equity 629,778 727,742 608,012
Equity, Including Portion Attributable to Noncontrolling Interest, Total 629,778   608,012
Liabilities and Equity, Total 2,089,670   2,058,680
Entergy New Orleans [Member] | Affiliated Entity [Member]      
Accounts Receivable [Abstract]      
Accounts Receivable, before Allowance for Credit Loss, Current 6,299   10,459
Liabilities, Current [Abstract]      
Notes Payable, Current 720   720
Accounts Payable, Current 43,919   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 62,507   55,972
Liabilities, Current [Abstract]      
Accounts Payable, Current 39,005   32,067
Entergy Texas [Member]      
Cash and Cash Equivalents [Abstract]      
Cash 1,426   200
Cash Equivalents, at Carrying Value 535,101   274,908
Cash and Cash Equivalent, Total 536,527   275,108
Other Restricted Assets, Current 1,265   1,480
Accounts Receivable [Abstract]      
Accounts Receivable, Allowance for Credit Loss, Current (6,966)   (8,598)
Other Receivables 78,548   67,400
Unbilled Receivables, Current 102,892   80,503
Accounts and Other Receivables, Net, Current 340,754   275,339
Deferred Fuel Cost 11,005   0
Energy Related Inventory 29,063   30,833
Public Utilities, Inventory 184,386   190,322
Prepaid Expense and Other Assets, Current 44,775   49,161
Assets, Current, Total 1,147,775   822,243
Assets, Noncurrent [Abstract]      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures 32   56
Other Long-Term Investments 15,703   15,607
Long-Term Investments, Total 15,735   15,663
Public Utilities, Property, Plant and Equipment, Net [Abstract]      
Public Utilities, Property, Plant and Equipment, Electric 9,684,887   9,491,159
Public Utilities, Property, Plant and Equipment, Construction Work in Progress 2,015,941   1,761,028
Public Utilities, Property, Plant and Equipment, Plant in Service, Total 11,700,828   11,252,187
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation 2,858,104   2,764,308
Public Utilities, Property, Plant and Equipment, Net, Total 8,842,724   8,487,879
Regulatory Asset [Abstract]      
Regulatory Asset, Noncurrent 500,952   510,806
Other Assets, Noncurrent 209,069   191,555
Deferred Costs and Other Assets 710,021   702,361
Assets, Total 10,716,255   10,028,146
Liabilities, Current [Abstract]      
Long-Term Debt, Current Maturities 130,000   130,000
Contract with Customer, Refund Liability, Current 44,276   42,109
Taxes Payable, Current 111,164   87,180
Interest Payable, Current 43,951   41,907
Deferred Fuel Costs, Current Liability 0   11,353
Other Liabilities, Current 21,280   16,801
Liabilities, Current, Total 636,130   921,141
Liabilities, Noncurrent [Abstract]      
Deferred Income Taxes and Other Tax Liabilities, Noncurrent 950,156   947,067
Accumulated Deferred Investment Tax Credit 6,173   6,467
Regulatory liability for income taxes - net 44,617   57,755
Regulatory Liability, Noncurrent 175,476   138,969
Asset Retirement Obligations, Noncurrent 15,511   15,097
Loss Contingency Accrual 13,451   13,558
Long-Term Debt, Excluding Current Maturities 4,312,972   3,900,188
Deferred Credits and Other Liabilities 132,911   129,693
Liabilities, Noncurrent, Total 5,651,267   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 1,790,125   1,425,125
Retained Earnings (Accumulated Deficit) 2,550,531   2,384,884
Equity, Attributable to Parent, Total 4,390,108   3,859,461
Equity, Including Portion Attributable to Noncontrolling Interest, Total 4,428,858 3,488,528 3,898,211
Liabilities and Equity, Total $ 10,716,255   $ 10,028,146
Common Stock, Shares, Issued 46,525,000   46,525,000
Repayments of Notes Payable $ (248,322) 0  
Entergy Texas [Member] | Affiliated Entity [Member]      
Accounts Receivable [Abstract]      
Accounts Receivable, before Allowance for Credit Loss, Current 50,925   $ 28,747
Liabilities, Current [Abstract]      
Accounts Payable, Current 62,249   73,178
Entergy Texas [Member] | Nonrelated Party [Member]      
Accounts Receivable [Abstract]      
Accounts Receivable, before Allowance for Credit Loss, Current 115,355   107,287
Liabilities, Current [Abstract]      
Accounts Payable, Current 223,210   518,613
System Energy [Member]      
Cash and Cash Equivalents [Abstract]      
Cash and Cash Equivalent, Total 285   56
Accounts Receivable [Abstract]      
Accounts Receivable, before Allowance for Credit Loss, Current 51,531   65,083
Other Receivables 5,320   6,833
Accounts and Other Receivables, Net, Current 56,851   71,916
Public Utilities, Inventory 146,063   149,847
Prepaid Expense and Other Assets, Current 8,261   5,101
Deferred Nuclear Refueling Outage Costs 43,287   9,096
Assets, Current, Total 254,747   236,016
Assets, Noncurrent [Abstract]      
Decommissioning Fund Investments 1,844,475   1,730,722
Long-Term Investments, Total 1,844,475   1,730,722
Public Utilities, Property, Plant and Equipment, Net [Abstract]      
Public Utilities, Property, Plant and Equipment, Electric 5,873,786   5,753,963
Public Utilities, Property, Plant and Equipment, Construction Work in Progress 94,268   123,172
Public Utilities, Property, Plant and Equipment, Fuel 286,392   208,932
Public Utilities, Property, Plant and Equipment, Plant in Service, Total 6,254,446   6,086,067
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation 3,710,098   3,679,886
Public Utilities, Property, Plant and Equipment, Net, Total 2,544,348   2,406,181
Regulatory Asset [Abstract]      
Regulatory Asset, Noncurrent 543,222   601,185
Other Assets, Noncurrent 40,241   34,301
Deferred Costs and Other Assets 583,463   635,486
Assets, Total 5,227,033   5,008,405
Liabilities, Current [Abstract]      
Long-Term Debt, Current Maturities 174   140
Taxes Payable, Current 832   11,685
Interest Payable, Current 15,263   13,215
Other Liabilities, Current 4,348   4,089
Liabilities, Current, Total 125,961   121,268
Liabilities, Noncurrent [Abstract]      
Deferred Income Taxes and Other Tax Liabilities, Noncurrent 641,263   625,165
Accumulated Deferred Investment Tax Credit 42,305   43,045
Regulatory liability for income taxes - net 94,419   99,960
Regulatory Liability, Noncurrent 925,415   897,301
Asset Retirement Obligations, Noncurrent 1,196,284   1,172,967
Long-Term Debt, Excluding Current Maturities 1,188,711   1,088,563
Deferred Credits and Other Liabilities 6,198   2
Liabilities, Noncurrent, Total 4,094,595   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) 97,533   51,190
Equity, Including Portion Attributable to Noncontrolling Interest, Total 1,006,477 $ 941,753 960,134
Liabilities and Equity, Total $ 5,227,033   $ 5,008,405
Common Stock, Shares, Issued 789,350   789,350
System Energy [Member] | Affiliated Entity [Member]      
Liabilities, Current [Abstract]      
Accounts Payable, Current $ 55,978   $ 25,528
System Energy [Member] | Nonrelated Party [Member]      
Liabilities, Current [Abstract]      
Accounts Payable, Current $ 49,366   $ 66,611