Income Taxes (Summary Of Unrecognized Benefits That Would Affect Effective Income Tax Rate) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 1,899.0	$ 3,254.0	$ 2,256.0
Entergy Arkansas [Member]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	57.2	377.9	262.1
Entergy Louisiana [Member]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	862.5	720.8	66.3
Entergy Mississippi [Member]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	1.0	151.2	51.7
Entergy New Orleans [Member]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	18.2	310.7	228.6
Entergy Texas [Member]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	2.9	3.3	2.6
System Energy [Member]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 3.1	$ 2.5	$ 1.7