Income Taxes (Summary Of Unrecognized Benefits That Would Affect Effective Income Tax Rate) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Unrecognized tax benefits that would impact effective income tax rate	$ 2,256.0	$ 2,208.0	$ 2,421.0
Entergy Arkansas [Member]
Unrecognized tax benefits that would impact effective income tax rate	262.1	259.3	203.3
Entergy Louisiana [Member]
Unrecognized tax benefits that would impact effective income tax rate	66.3	63.8	556.3
Entergy Mississippi [Member]
Unrecognized tax benefits that would impact effective income tax rate	51.7	50.7	1.9
Entergy New Orleans [Member]
Unrecognized tax benefits that would impact effective income tax rate	228.6	203.5	242.7
Entergy Texas [Member]
Unrecognized tax benefits that would impact effective income tax rate	2.6	6.1	5.7
System Energy [Member]
Unrecognized tax benefits that would impact effective income tax rate	$ 1.7	$ 0.5	$ 0.0