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Retirement And Other Postretirement Benefits (Schedule of Net Benefit Costs) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Pension Plan [Member] | Qualified Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Service Cost | $ 23,454 | $ 23,358 | $ 70,688 | $ 70,104
Defined Benefit Plan, Interest Cost | 58,145 | 56,631 | 177,505 | 193,218
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | (75,383) | (76,557) | (225,943) | (262,043)
Defined Benefit Plan, Amortization of Gain (Loss) | 13,086 | 14,322 | 39,704 | 44,296
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment | 23,874 | 0 | 23,874 | 325,253
Defined Benefit Plan, Other Cost (Credit) | (5,780) | 0 | (5,780) | 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total | 37,396 | 17,754 | 80,048 | 370,828
Pension Plan [Member] | Entergy Arkansas [Member] | Qualified Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Service Cost | 4,385 | 4,101 | 13,239 | 12,300
Defined Benefit Plan, Interest Cost | 13,580 | 13,218 | 41,208 | 39,652
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | (17,791) | (18,156) | (53,143) | (54,466)
Defined Benefit Plan, Amortization of Gain (Loss) | 4,171 | 5,745 | 13,753 | 17,237
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment | 1,454 |  | 1,454 | 0
Defined Benefit Plan, Other Cost (Credit) | 0 |  | 0 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total | 5,799 | 4,908 | 16,511 | 14,723
Pension Plan [Member] | Entergy Louisiana [Member] | Qualified Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Service Cost | 5,403 | 5,550 | 16,311 | 16,652
Defined Benefit Plan, Interest Cost | 14,347 | 13,962 | 43,755 | 41,884
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | (18,981) | (19,446) | (56,775) | (58,340)
Defined Benefit Plan, Amortization of Gain (Loss) | 2,367 | 2,601 | 6,903 | 7,805
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment | 5,982 |  | 5,982 | 0
Defined Benefit Plan, Other Cost (Credit) | (2,472) |  | (2,472) |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total | 6,646 | 2,667 | 13,704 | 8,001
Pension Plan [Member] | Entergy Mississippi [Member] | Qualified Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Service Cost | 1,296 | 1,284 | 3,904 | 3,852
Defined Benefit Plan, Interest Cost | 3,661 | 3,522 | 11,059 | 10,564
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | (5,039) | (5,112) | (14,937) | (15,338)
Defined Benefit Plan, Amortization of Gain (Loss) | 750 | 1,140 | 2,394 | 3,420
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment | 146 |  | 146 | 0
Defined Benefit Plan, Other Cost (Credit) | 0 |  | 0 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total | 814 | 834 | 2,566 | 2,498
Pension Plan [Member] | Entergy New Orleans [Member] | Qualified Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Service Cost | 410 | 441 | 1,232 | 1,321
Defined Benefit Plan, Interest Cost | 1,613 | 1,569 | 4,907 | 4,707
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | (1,946) | (2,202) | (6,294) | (6,609)
Defined Benefit Plan, Amortization of Gain (Loss) | 703 | 471 | 1,533 | 1,411
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment | 6,195 |  | 6,195 | 0
Defined Benefit Plan, Other Cost (Credit) | (1,934) |  | (1,934) |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total | 5,041 | 279 | 5,639 | 830
Pension Plan [Member] | Entergy Texas [Member] | Qualified Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Service Cost | 1,008 | 963 | 3,056 | 2,886
Defined Benefit Plan, Interest Cost | 2,917 | 2,832 | 8,863 | 8,494
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | (3,890) | (4,077) | (11,668) | (12,231)
Defined Benefit Plan, Amortization of Gain (Loss) | 454 | 393 | 1,362 | 1,179
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment | 617 |  | 617 | 0
Defined Benefit Plan, Other Cost (Credit) | 0 |  | 0 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total | 1,106 | 111 | 2,230 | 328
Pension Plan [Member] | System Energy [Member] | Qualified Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Service Cost | 1,352 | 1,380 | 4,096 | 4,147
Defined Benefit Plan, Interest Cost | 3,497 | 3,375 | 10,667 | 10,152
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | (4,605) | (4,602) | (13,755) | (13,883)
Defined Benefit Plan, Amortization of Gain (Loss) | 954 | 1,155 | 3,182 | 3,482
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment | 512 |  | 512 | 611
Defined Benefit Plan, Other Cost (Credit) | 0 |  | 0 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total | 1,710 | 1,308 | 4,702 | 4,509
Other Postretirement Benefits Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Service Cost | 2,702 | 3,126 | 8,216 | 9,378
Defined Benefit Plan, Interest Cost | 9,447 | 9,852 | 28,827 | 29,556
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | (9,830) | (10,569) | (30,248) | (31,707)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | (5,661) | (5,720) | (17,101) | (17,160)
Defined Benefit Plan, Amortization of Gain (Loss) | (3,679) | (2,761) | (11,419) | (8,283)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment | (2,957) | 0 | (2,957) | 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment | (2,202) | 0 | (2,202) | 0
Defined Benefit Plan, Other Cost (Credit) | 13,725 | 0 | 13,725 | 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total | 1,545 | (6,072) | (13,159) | (18,216)
Other Postretirement Benefits Plan [Member] | Entergy Arkansas [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Service Cost | 571 | 642 | 1,715 | 1,926
Defined Benefit Plan, Interest Cost | 1,775 | 1,833 | 5,325 | 5,499
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | (4,225) | (4,384) | (12,675) | (13,152)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | 524 | 524 | 1,572 | 1,572
Defined Benefit Plan, Amortization of Gain (Loss) | (353) | 0 | (1,059) | 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment | 0 |  | 0 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment | 0 |  | 0 |
Defined Benefit Plan, Other Cost (Credit) | 0 |  | 0 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total | (1,708) | (1,385) | (5,122) | (4,155)
Other Postretirement Benefits Plan [Member] | Entergy Louisiana [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Service Cost | 632 | 700 | 1,974 | 2,100
Defined Benefit Plan, Interest Cost | 1,932 | 1,999 | 5,956 | 5,997
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | 0 | 0 | 0 | 0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | (1,136) | (1,136) | (3,408) | (3,408)
Defined Benefit Plan, Amortization of Gain (Loss) | (1,500) | (1,738) | (5,122) | (5,214)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment | (1,014) |  | (1,014) |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment | (1,094) |  | (1,094) |
Defined Benefit Plan, Other Cost (Credit) | (2,541) |  | (2,541) |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total | (4,721) | (175) | (5,249) | (525)
Other Postretirement Benefits Plan [Member] | Entergy Mississippi [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Service Cost | 162 | 184 | 486 | 552
Defined Benefit Plan, Interest Cost | 489 | 486 | 1,467 | 1,458
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | (1,327) | (1,372) | (3,983) | (4,116)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | (239) | (239) | (717) | (717)
Defined Benefit Plan, Amortization of Gain (Loss) | (58) | 15 | (172) | 45
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment | 0 |  | 0 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment | 0 |  | 0 |
Defined Benefit Plan, Other Cost (Credit) | 0 |  | 0 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total | (973) | (926) | (2,919) | (2,778)
Other Postretirement Benefits Plan [Member] | Entergy New Orleans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Service Cost | 32 | 51 | 136 | 153
Defined Benefit Plan, Interest Cost | 203 | 253 | 701 | 759
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | (1,065) | (1,479) | (3,955) | (4,437)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | (170) | (229) | (628) | (687)
Defined Benefit Plan, Amortization of Gain (Loss) | (83) | 19 | (137) | 57
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment | (1,345) |  | (1,345) |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment | (268) |  | (268) |
Defined Benefit Plan, Other Cost (Credit) | 18,793 |  | 18,793 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total | 16,097 | (1,385) | 13,297 | (4,155)
Other Postretirement Benefits Plan [Member] | Entergy Texas [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Service Cost | 158 | 168 | 476 | 504
Defined Benefit Plan, Interest Cost | 581 | 603 | 1,745 | 1,809
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | (2,451) | (2,539) | (7,355) | (7,617)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | (1,093) | (1,093) | (3,279) | (3,279)
Defined Benefit Plan, Amortization of Gain (Loss) | 154 | 148 | 460 | 444
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment | 0 |  | 0 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment | 0 |  | 0 |
Defined Benefit Plan, Other Cost (Credit) | 0 |  | 0 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total | (2,651) | (2,713) | (7,953) | (8,139)
Other Postretirement Benefits Plan [Member] | System Energy [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Service Cost | 175 | 175 | 523 | 525
Defined Benefit Plan, Interest Cost | 394 | 398 | 1,182 | 1,194
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | (703) | (728) | (2,107) | (2,184)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | (73) | (73) | (219) | (219)
Defined Benefit Plan, Amortization of Gain (Loss) | (7) | 0 | (21) | 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment | 0 |  | 0 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment | 0 |  | 0 |
Defined Benefit Plan, Other Cost (Credit) | 0 |  | 0 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total | $ (214) | $ (228) | $ (642) | $ (684)

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