Income Taxes (Summary of Interest Recorded in Income Tax Expense Related to Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Unrecognized Tax Benefits, Interest on Income Taxes Expense	$ (7.0)	$ (11.0)	$ 8.0
Entergy Arkansas [Member]
Unrecognized Tax Benefits, Interest on Income Taxes Expense	0.6	3.5	1.6
Entergy Louisiana [Member]
Unrecognized Tax Benefits, Interest on Income Taxes Expense	3.6	(2.6)	0.4
Entergy Mississippi [Member]
Unrecognized Tax Benefits, Interest on Income Taxes Expense	1.1	(1.0)	0.7
Entergy New Orleans [Member]
Unrecognized Tax Benefits, Interest on Income Taxes Expense	0.0	(5.8)	1.2
Entergy Texas [Member]
Unrecognized Tax Benefits, Interest on Income Taxes Expense	0.5	(1.1)	0.0
System Energy [Member]
Unrecognized Tax Benefits, Interest on Income Taxes Expense	$ 1.0	$ 0.0	$ (10.2)