Income Taxes (Summary Of Accrued Interest And Penalties Related To Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 39.0	$ 50.0	$ 52.0
Entergy Arkansas [Member]
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	7.8	4.3	2.7
Entergy Louisiana [Member]
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	1.5	4.1	3.7
Entergy Mississippi [Member]
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	2.1	3.1	2.4
Entergy New Orleans [Member]
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	0.6	6.4	5.2
Entergy Texas [Member]
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	0.0	1.1	1.1
System Energy [Member]
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 1.9	$ 1.9	$ 12.1