Income Taxes (Summary Of Income Tax Contingencies) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 2,781.0	$ 1,900.0	$ 1,899.0
Entergy Arkansas [Member]
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	360.3	32.6	57.2
Entergy Louisiana [Member]
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	1,141.9	868.2	862.5
Entergy Mississippi [Member]
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	1.7	1.3	1.0
Entergy New Orleans [Member]
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	18.1	18.3	18.2
Entergy Texas [Member]
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	113.6	50.3	2.9
System Energy [Member]
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 218.0	$ 4.0	$ 3.1