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v3.25.3

Decommissioning Trust Funds (Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | $ 273.0 | $ 1,102.0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 553.0 | 510.0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 826.0 | 1,612.0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 4.0 | 24.0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 42.0 | 56.0
Debt Securities, Available-for-Sale, Unrealized Loss Position | 46.0 | 80.0
Entergy Arkansas [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 49.6 | 282.8
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 224.7 | 195.0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 274.3 | 477.8
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 0.6 | 8.2
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 13.5 | 17.6
Debt Securities, Available-for-Sale, Unrealized Loss Position | 14.1 | 25.8
Entergy Louisiana [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 154.5 | 543.8
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 177.5 | 178.4
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 332.0 | 722.2
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 3.2 | 8.8
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 12.8 | 18.1
Debt Securities, Available-for-Sale, Unrealized Loss Position | 16.0 | 26.9
System Energy [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 68.7 | 275.6
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 150.9 | 136.8
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 219.6 | 412.4
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 0.6 | 6.8
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 15.6 | 20.8
Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 16.2 | $ 27.6

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