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Segment Reporting (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]        
Asset Impairment Charges   $ 12,795 $ 107,134 $ 42,679
Depreciation, Depletion and Amortization   2,305,568 2,233,248 2,051,677
Investment Income, Net   317,348 298,865 162,726
Interest Expense, Nonoperating   1,336,651 1,150,820 1,006,406
Income Tax Expense (Benefit) $ 9,000 497,952 381,027 (690,535)
Assets   71,890,730 64,790,032 59,703,396
Segment, Expenditure, Addition to Long-Lived Assets   8,213,687 5,969,710 4,746,719
Revenues   12,946,686 11,879,653 12,147,412
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses   3,055,097 2,898,237 2,898,213
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest   1,773,328 1,061,184 2,362,310
Entergy Arkansas [Member]        
Segment Reporting Information [Line Items]        
Asset Impairment Charges   0 131,775 78,434
Investment Income, Net   67,375 70,628 25,024
Interest Expense, Nonoperating   230,482 203,852 179,962
Income Tax Expense (Benefit)   107,880 74,574 (99,210)
Assets   16,470,902 15,073,983  
Revenues   2,784,047 2,460,181 2,646,396
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses   778,445 742,573 737,649
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest   437,453 319,466 396,850
Entergy Louisiana [Member]        
Segment Reporting Information [Line Items]        
Interest Expense, Nonoperating   467,903 391,183 360,299
Income Tax Expense (Benefit)   237,813 225,409 (205,781)
Assets   33,337,570 30,348,550  
Revenues   5,732,099 5,144,018 5,147,770
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses   1,136,573 1,097,283 1,097,233
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest   1,112,900 890,771 1,273,370
Entergy Mississippi [Member]        
Segment Reporting Information [Line Items]        
Investment Income, Net   18,024 3,249 2,275
Interest Expense, Nonoperating   144,315 107,411 96,378
Income Tax Expense (Benefit)   95,101 80,315 54,364
Assets   8,476,474 6,988,970  
Revenues   1,955,705 1,764,593 1,802,533
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses   371,096 315,651 320,192
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest   308,728 245,407 181,969
Entergy New Orleans [Member]        
Segment Reporting Information [Line Items]        
Asset Impairment Charges   12,795 0 0
Investment Income, Net   2,650 2,144 7,154
Interest Expense, Nonoperating   46,301 41,454 37,404
Income Tax Expense (Benefit)   15,855 2,842 (189,973)
Assets   2,058,680 2,223,153  
Revenues   772,214 810,564 843,933
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses   157,415 172,101 167,719
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest   50,411 15,847 228,938
Entergy Texas [Member]        
Segment Reporting Information [Line Items]        
Investment Income, Net   5,964 15,107 11,116
Interest Expense, Nonoperating   138,743 119,194 104,433
Income Tax Expense (Benefit)   65,366 65,684 62,872
Assets   10,028,146 8,970,080  
Revenues   2,127,584 2,050,150 2,028,586
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses   359,812 340,956 323,797
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest   334,071 293,622 291,273
System Energy [Member]        
Segment Reporting Information [Line Items]        
Investment Income, Net   54,971 47,953 13,131
Interest Expense, Nonoperating   68,059 45,102 46,662
Income Tax Expense (Benefit)   19,575 29,503 32,032
Assets   5,008,405 4,642,474  
Revenues   581,481 585,049 586,603
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses   189,628 192,300 207,765
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest   88,095 103,500 108,772
Consolidation, Eliminations        
Segment Reporting Information [Line Items]        
Asset Impairment Charges   0 0 0
Depreciation, Depletion and Amortization   0 0 0
Investment Income, Net   (296,388) (315,013) (299,685)
Interest Expense, Nonoperating   (1,017) (2,152) (705)
Income Tax Expense (Benefit)   0 0 0
Assets   (4,608,430) (4,882,991) (5,020,240)
Segment, Expenditure, Addition to Long-Lived Assets   0 0 0
Revenues   (90) (63) (41)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest   (295,371) (312,860) (298,979)
Utility [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Asset Impairment Charges   12,795 131,775 79,962
Depreciation, Depletion and Amortization   2,298,610 2,226,681 2,045,254
Investment Income, Net   605,003 592,257 443,751
Interest Expense, Nonoperating   1,085,717 899,655 816,643
Income Tax Expense (Benefit)   551,272 515,665 (374,847)
Assets   75,726,104 68,951,564 63,887,038
Segment, Expenditure, Addition to Long-Lived Assets   8,211,445 5,967,739 4,745,918
Revenues   12,887,921 11,805,802 12,022,944
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses   3,013,000 2,851,165 2,838,057
Segment Reporting, Other Segment Item, Amount   4,177,829 4,109,352 3,152,475
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest   2,292,576 1,830,301 2,510,904
Corporate Segment and Other Operating Segment [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Asset Impairment Charges   0 (24,641) (37,283)
Depreciation, Depletion and Amortization   6,958 6,567 6,423
Investment Income, Net   8,733 21,621 18,660
Interest Expense, Nonoperating   251,951 253,317 190,468
Income Tax Expense (Benefit)   (53,320) (134,638) (315,688)
Assets   773,056 721,459 836,598
Segment, Expenditure, Addition to Long-Lived Assets   2,242 1,971 801
Revenues   $ 58,855 $ 73,914 $ 124,509