Income Taxes (Summary of Interest Recorded in Income Tax Expense Related to Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Unrecognized Tax Benefits, Interest on Income Taxes Expense	$ 10.0	$ (7.0)	$ (11.0)
Entergy Arkansas [Member]
Unrecognized Tax Benefits, Interest on Income Taxes Expense	1.1	0.6	3.5
Entergy Louisiana [Member]
Unrecognized Tax Benefits, Interest on Income Taxes Expense	8.6	3.6	(2.6)
Entergy Mississippi [Member]
Unrecognized Tax Benefits, Interest on Income Taxes Expense	1.3	1.1	(1.0)
Entergy New Orleans [Member]
Unrecognized Tax Benefits, Interest on Income Taxes Expense	1.3	0.0	(5.8)
Entergy Texas [Member]
Unrecognized Tax Benefits, Interest on Income Taxes Expense	0.8	0.5	(1.1)
System Energy [Member]
Unrecognized Tax Benefits, Interest on Income Taxes Expense	$ (0.6)	$ 1.0	$ 0.0