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Decommissioning Trust Funds (Schedule of Realized Gain (Loss)) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Proceeds from Sale of Debt Securities, Available-for-sale | $ 262.0 | $ 169.0
Debt Securities, Available-for-Sale, Realized Gain | 1.0 | 0.0
Debt Securities, Available-for-Sale, Realized Loss | 4.0 | 7.0
System Energy [Member] |  |
Proceeds from Sale of Debt Securities, Available-for-sale | 152.3 | 108.0
Debt Securities, Available-for-Sale, Realized Gain | 0.6 | 0.2
Debt Securities, Available-for-Sale, Realized Loss | 2.7 | 3.5
Entergy Louisiana [Member] |  |
Proceeds from Sale of Debt Securities, Available-for-sale | 110.0 | 48.4
Debt Securities, Available-for-Sale, Realized Gain | 0.1 | 0.2
Debt Securities, Available-for-Sale, Realized Loss | 1.5 | 2.9
Entergy Arkansas [Member] |  |
Proceeds from Sale of Debt Securities, Available-for-sale | 0.0 | 12.4
Debt Securities, Available-for-Sale, Realized Gain | 0.0 | 0.0
Debt Securities, Available-for-Sale, Realized Loss | $ 0.0 | $ 0.4

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