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v3.25.1

Decommissioning Trust Funds (Schedule of Available-for-Sale Securities Reconciliation) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items] |  |
Debt Securities, Available-for-Sale | $ 2,091.0 | $ 2,047.0
Debt Securities, Available-for-Sale, Unrealized Gain | 15.0 | 7.0
Debt Securities, Available-for-Sale, Unrealized Loss | 62.0 | 80.0
Entergy Arkansas [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Debt Securities, Available-for-Sale | 590.1 | 579.0
Debt Securities, Available-for-Sale, Unrealized Gain | 4.0 | 1.2
Debt Securities, Available-for-Sale, Unrealized Loss | 18.1 | 25.8
Entergy Louisiana [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Debt Securities, Available-for-Sale | 926.1 | 908.1
Debt Securities, Available-for-Sale, Unrealized Gain | 6.3 | 3.6
Debt Securities, Available-for-Sale, Unrealized Loss | 23.1 | 26.9
System Energy [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Debt Securities, Available-for-Sale | 574.9 | 559.8
Debt Securities, Available-for-Sale, Unrealized Gain | 4.7 | 1.9
Debt Securities, Available-for-Sale, Unrealized Loss | $ 20.6 | $ 27.6

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