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Rate and Regulatory Matters (Unit Power Sales Agreement - Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Oct. 31, 2021	Sep. 30, 2023	Dec. 31, 2025	Oct. 01, 2025
System Energy [Member] | Depreciation Amendment Proceeding [Member]
Reduction to depreciation expense resulting from differences in depreciation rates		$ 41.0
System Energy [Member] | Pension Costs Amendment Proceeding [Member]
Public Utilities, Requested Rate Increase (Decrease), Amount	$ 8.9
Entergy Arkansas [Member]
Percentage of capacity and energy purchases under Unit Power Sales Agreement			36.00%	24.19%
Entergy Mississippi [Member]
Percentage of capacity and energy purchases under Unit Power Sales Agreement			33.00%	56.38%
Entergy New Orleans [Member]
Percentage of capacity and energy purchases under Unit Power Sales Agreement			17.00%	19.43%

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Reduction to depreciation expense resulting from differences in depreciation rates

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Amount of public utility's requested rate increase (decrease) with regulatory agency.

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