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Commitments and Contingencies (Narrative) (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2025 USD ($) | Oct. 31, 2024 USD ($) | Sep. 30, 2025 unit MW | Jun. 30, 2025 unit | Oct. 01, 2025 | Jan. 01, 2025 | Dec. 31, 2024
Entergy Arkansas [Member] |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |
Percentage of capacity and energy purchases under Unit Power Sales Agreement |  |  |  |  | 24.20% |  | 36.00%
Entergy Louisiana [Member] |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |
Percentage of capacity and energy purchases under Unit Power Sales Agreement |  |  |  |  |  |  | 14.00%
Entergy Louisiana [Member] | Entergy Mississippi [Member] |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |
Percentage of capacity and energy purchases under Unit Power Sales Agreement |  |  |  |  |  | 14.00% |
Percentage of purchases under MSS-4 replacement tariff |  |  |  |  |  | 2.43% |
Entergy Mississippi [Member] |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |
Percentage of capacity and energy purchases under Unit Power Sales Agreement |  |  |  |  | 56.40% |  | 33.00%
Entergy New Orleans [Member] |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |
Percentage of capacity and energy purchases under Unit Power Sales Agreement |  |  |  |  | 19.40% |  | 17.00%
Minimum [Member] |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |
Generation Capacity | MW |  |  | 400 |  |  |  |
Power island equipment |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |
Long-Term Purchase Commitment, Minimum Quantity Required | unit |  |  | 21 | 15 |  |  |
Combustion turbine |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |
Long-Term Purchase Commitment, Minimum Quantity Required | unit |  |  | 2 | 2 |  |  |
Palisades |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |
Litigation Settlement, Amount Awarded from Other Party |  | $ 7 |  |  |  |  |
Proceeds from Legal Settlements | $ 7 |  |  |  |  |  |
Damages awarded for costs previously recorded as other operation and maintenance expenses |  | 3 |  |  |  |  |
Damages awarded for costs previously recorded as plant |  | $ 4 |  |  |  |  |

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