Income Taxes (Summary Of Unrecognized Benefits That Would Affect Effective Income Tax Rate) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Unrecognized tax benefits that would impact effective income tax rate	$ 3,254.0	$ 2,256.0	$ 2,208.0
Entergy Arkansas [Member]
Unrecognized tax benefits that would impact effective income tax rate	377.9	262.1	259.3
Entergy Louisiana [Member]
Unrecognized tax benefits that would impact effective income tax rate	720.8	66.3	63.8
Entergy Mississippi [Member]
Unrecognized tax benefits that would impact effective income tax rate	151.2	51.7	50.7
Entergy New Orleans [Member]
Unrecognized tax benefits that would impact effective income tax rate	310.7	228.6	203.5
Entergy Texas [Member]
Unrecognized tax benefits that would impact effective income tax rate	3.3	2.6	6.1
System Energy [Member]
Unrecognized tax benefits that would impact effective income tax rate	$ 2.5	$ 1.7	$ 0.5