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Retirement And Other Postretirement Benefits (Schedule of Expected Benefit Payments) (Details) - Pension Plan [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2025
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  |  | $ 147,600 |  |
Qualified Plan |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Service Cost | $ 23,454 | $ 23,358 | 70,688 | $ 70,104 |
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 |
Entergy Louisiana [Member] |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year | 41,253 |  | 41,253 |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  |  | 25,383 |  |
Entergy Louisiana [Member] | Qualified Plan |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Service Cost | 5,403 | 5,550 | 16,311 | 16,652 |
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) |  |
Entergy Louisiana [Member] | Subsequent Event [Member] |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year |  |  |  |  | $ 15,870
Entergy Mississippi [Member] |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year | 8,064 |  | 8,064 |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  |  | 5,322 |  |
Entergy Mississippi [Member] | Qualified Plan |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Service Cost | 1,296 | 1,284 | 3,904 | 3,852 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment | 146 |  | 146 | 0 |
Defined Benefit Plan, Other Cost (Credit) | 0 |  | 0 |  |
Entergy Mississippi [Member] | Subsequent Event [Member] |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year |  |  |  |  | 2,742
Entergy New Orleans [Member] |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year | 5,016 |  | 5,016 |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  |  | 3,080 |  |
Entergy New Orleans [Member] | Qualified Plan |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Service Cost | 410 | 441 | 1,232 | 1,321 |
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) |  |
Entergy New Orleans [Member] | Subsequent Event [Member] |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year |  |  |  |  | 1,936
Entergy Texas [Member] |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year | 7,725 |  | 7,725 |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  |  | 4,735 |  |
Entergy Texas [Member] | Qualified Plan |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Service Cost | 1,008 | 963 | 3,056 | 2,886 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment | 617 |  | 617 | 0 |
Defined Benefit Plan, Other Cost (Credit) | 0 |  | 0 |  |
Entergy Texas [Member] | Subsequent Event [Member] |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year |  |  |  |  | 2,990
System Energy [Member] |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year | 15,668 |  | 15,668 |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  |  | 9,498 |  |
System Energy [Member] | Qualified Plan |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Service Cost | 1,352 | 1,380 | 4,096 | 4,147 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment | 512 |  | 512 | 611 |
Defined Benefit Plan, Other Cost (Credit) | 0 |  | 0 |  |
System Energy [Member] | Subsequent Event [Member] |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year |  |  |  |  | 6,170
Entergy Arkansas [Member] |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year | 35,544 |  | 35,544 |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  |  | 23,160 |  |
Entergy Arkansas [Member] | Qualified Plan |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Service Cost | 4,385 | $ 4,101 | 13,239 | 12,300 |
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 |  |
Entergy Arkansas [Member] | Subsequent Event [Member] |  |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year |  |  |  |  | $ 12,384

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