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Decommissioning Trust Funds (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Decommissioning Trust Funds (Textual) [Abstract] |  |  |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | $ 2,173,000,000 |  | $ 2,173,000,000 |  | $ 2,121,000,000
Average Coupon Rate of Debt Securities Percentage | 4.16% |  | 4.16% |  |
Average Duration of Debt Securities in Years |  |  | 6 years 4 months 9 days |  |
Average Maturity of Debt Securities, Years |  |  | 10 years 7 months 24 days |  |
Proceeds from Sale of Debt Securities, Available-for-Sale | $ 223,000,000 | $ 173,000,000 | $ 712,000,000 | $ 504,000,000 |
Debt Securities, Available-for-Sale, Realized Gain | 2,000,000 | 3,000,000 | 4,000,000 | 3,000,000 |
Debt Securities, Available-for-Sale, Realized Loss | 3,000,000 | 5,000,000 | 11,000,000 | 26,000,000 |
Equity Securities, FV-NI, Unrealized Gain (Loss) | 277,000,000 |  | 435,000,000 |  |
Deferred Tax Asset, Debt Securities, Available-for-Sale, Unrealized Loss | 0 |  | 0 |  | 0
Entergy Arkansas [Member] |  |  |  |  |
Decommissioning Trust Funds (Textual) [Abstract] |  |  |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | $ 615,800,000 |  | $ 615,800,000 |  | 603,500,000
Average Coupon Rate of Debt Securities Percentage | 3.85% |  | 3.85% |  |
Average Duration of Debt Securities in Years |  |  | 6 years 4 months 20 days |  |
Average Maturity of Debt Securities, Years |  |  | 8 years 8 months 12 days |  |
Proceeds from Sale of Debt Securities, Available-for-Sale | $ 15,000,000.0 | 4,200,000 | $ 15,000,000.0 | 22,100,000 |
Debt Securities, Available-for-Sale, Realized Gain | 100,000 | 0 | 100,000 | 100,000 |
Debt Securities, Available-for-Sale, Realized Loss | 100,000 | 300,000 | 100,000 | 1,200,000 |
Equity Securities, FV-NI, Unrealized Gain (Loss) | 79,900,000 |  | 123,600,000 |  |
Entergy Louisiana [Member] |  |  |  |  |
Decommissioning Trust Funds (Textual) [Abstract] |  |  |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | $ 954,800,000 |  | $ 954,800,000 |  | 931,500,000
Average Coupon Rate of Debt Securities Percentage | 4.40% |  | 4.40% |  |
Average Duration of Debt Securities in Years |  |  | 6 years 3 months 29 days |  |
Average Maturity of Debt Securities, Years |  |  | 12 years 3 months 18 days |  |
Proceeds from Sale of Debt Securities, Available-for-Sale | $ 120,800,000 | 51,900,000 | $ 302,300,000 | 162,800,000 |
Percentage Interest in River Bend |  |  | 30.00% |  |
Debt Securities, Available-for-Sale, Realized Gain | 1,000,000.0 | 500,000 | $ 1,200,000 | 700,000 |
Debt Securities, Available-for-Sale, Realized Loss | 1,900,000 | 1,500,000 | 5,900,000 | 9,200,000 |
Equity Securities, FV-NI, Unrealized Gain (Loss) | 120,700,000 |  | 192,900,000 |  |
System Energy [Member] |  |  |  |  |
Decommissioning Trust Funds (Textual) [Abstract] |  |  |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | $ 602,800,000 |  | $ 602,800,000 |  | $ 585,500,000
Average Coupon Rate of Debt Securities Percentage | 4.11% |  | 4.11% |  |
Average Duration of Debt Securities in Years |  |  | 6 years 4 months 17 days |  |
Average Maturity of Debt Securities, Years |  |  | 10 years 3 days |  |
Proceeds from Sale of Debt Securities, Available-for-Sale | $ 87,300,000 | 117,300,000 | $ 394,900,000 | 318,800,000 |
Debt Securities, Available-for-Sale, Realized Gain | 1,200,000 | 2,200,000 | 2,600,000 | 2,400,000 |
Debt Securities, Available-for-Sale, Realized Loss | 600,000 | $ 3,300,000 | 4,600,000 | $ 15,200,000 |
Equity Securities, FV-NI, Unrealized Gain (Loss) | $ 76,400,000 |  | $ 118,800,000 |  |

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