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Decommissioning Trust Funds (Schedule of Realized Gain (Loss)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Proceeds from Sale of Debt Securities, Available-for-sale | $ 223,000 | $ 173,000 | $ 712,000 | $ 504,000
Debt Securities, Available-for-Sale, Realized Gain | 2,000 | 3,000 | 4,000 | 3,000
Debt Securities, Available-for-Sale, Realized Loss | 3,000 | 5,000 | 11,000 | 26,000
System Energy [Member] |  |  |  |
Proceeds from Sale of Debt Securities, Available-for-sale | 87,300 | 117,300 | 394,900 | 318,800
Debt Securities, Available-for-Sale, Realized Gain | 1,200 | 2,200 | 2,600 | 2,400
Debt Securities, Available-for-Sale, Realized Loss | 600 | 3,300 | 4,600 | 15,200
Entergy Louisiana [Member] |  |  |  |
Proceeds from Sale of Debt Securities, Available-for-sale | 120,800 | 51,900 | 302,300 | 162,800
Debt Securities, Available-for-Sale, Realized Gain | 1,000 | 500 | 1,200 | 700
Debt Securities, Available-for-Sale, Realized Loss | 1,900 | 1,500 | 5,900 | 9,200
Entergy Arkansas [Member] |  |  |  |
Proceeds from Sale of Debt Securities, Available-for-sale | 15,000 | 4,200 | 15,000 | 22,100
Debt Securities, Available-for-Sale, Realized Gain | 100 | 0 | 100 | 100
Debt Securities, Available-for-Sale, Realized Loss | $ 100 | $ 300 | $ 100 | $ 1,200

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