Income Taxes (Summary Of Accrued Interest And Penalties Related To Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accrued income tax interest and penalties	$ 52.0	$ 44.0	$ 48.0
Entergy Arkansas [Member]
Accrued income tax interest and penalties	2.7	2.3	3.1
Entergy Louisiana [Member]
Accrued income tax interest and penalties	3.7	3.4	14.2
Entergy Mississippi [Member]
Accrued income tax interest and penalties	2.4	1.9	1.7
Entergy New Orleans [Member]
Accrued income tax interest and penalties	5.2	3.9	4.7
Entergy Texas [Member]
Accrued income tax interest and penalties	1.1	0.9	1.1
System Energy [Member]
Accrued income tax interest and penalties	$ 12.1	$ 11.9	$ 14.5