Income Taxes (Summary Of Accrued Interest And Penalties Related To Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accrued income tax interest and penalties	$ 50.0	$ 52.0	$ 44.0
Entergy Arkansas [Member]
Accrued income tax interest and penalties	4.3	2.7	2.3
Entergy Louisiana [Member]
Accrued income tax interest and penalties	4.1	3.7	3.4
Entergy Mississippi [Member]
Accrued income tax interest and penalties	3.1	2.4	1.9
Entergy New Orleans [Member]
Accrued income tax interest and penalties	6.4	5.2	3.9
Entergy Texas [Member]
Accrued income tax interest and penalties	1.1	1.1	0.9
System Energy [Member]
Accrued income tax interest and penalties	$ 1.9	$ 12.1	$ 11.9