DECOMMISSIONING TRUST FUNDS (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, and System Energy) (Schedule of Realized Gain (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Debt Securities, Available-for-Sale [Line Items]
Proceeds from disposition of securities	$ 208.0	$ 223.0	$ 576.0	$ 712.0
Realized gains	0.0	2.0	1.0	4.0
Realized losses	7.0	3.0	15.0	11.0
ENTERGY ARKANSAS, LLC
Debt Securities, Available-for-Sale [Line Items]
Proceeds from disposition of securities	3.6	15.0	14.6	15.0
Realized gains	0.0	0.1	0.1	0.1
Realized losses	0.2	0.1	0.3	0.1
ENTERGY LOUISIANA, LLC
Debt Securities, Available-for-Sale [Line Items]
Proceeds from disposition of securities	101.1	120.8	290.7	302.3
Realized gains	0.1	1.0	0.7	1.2
Realized losses	3.3	1.9	9.4	5.9
SYSTEM ENERGY RESOURCES, INC.
Debt Securities, Available-for-Sale [Line Items]
Proceeds from disposition of securities	104.2	87.3	270.9	394.9
Realized gains	0.0	1.2	0.6	2.6
Realized losses	$ 3.4	$ 0.6	$ 5.5	$ 4.6