Revenue (Allowance for Doubtful Accounts) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Allowance for Credit Loss, Receivable, Other, Current	$ 17.9	$ 25.9	$ 30.9
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	32.0	38.7
Accounts Receivable, Allowance for Credit Loss, Writeoff	(71.2)	(83.1)
Accounts Receivable, Allowance for Credit Loss, Recovery	31.2	39.4
Entergy Arkansas [Member]
Allowance for Credit Loss, Receivable, Other, Current	4.7	7.2	6.5
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	7.0	9.4
Accounts Receivable, Allowance for Credit Loss, Writeoff	(17.5)	(20.6)
Accounts Receivable, Allowance for Credit Loss, Recovery	8.0	11.9
Entergy Louisiana [Member]
Allowance for Credit Loss, Receivable, Other, Current	3.0	6.1	7.6
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	10.0	13.9
Accounts Receivable, Allowance for Credit Loss, Writeoff	(23.3)	(31.3)
Accounts Receivable, Allowance for Credit Loss, Recovery	10.2	15.9
Entergy New Orleans [Member]
Allowance for Credit Loss, Receivable, Other, Current	6.7	7.8	11.9
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	4.6	3.4
Accounts Receivable, Allowance for Credit Loss, Writeoff	(10.4)	(10.7)
Accounts Receivable, Allowance for Credit Loss, Recovery	4.7	3.2
Entergy Mississippi [Member]
Allowance for Credit Loss, Receivable, Other, Current	2.2	3.3	2.5
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	4.8	7.3
Accounts Receivable, Allowance for Credit Loss, Writeoff	(11.5)	(10.4)
Accounts Receivable, Allowance for Credit Loss, Recovery	5.6	3.9
Entergy Texas [Member]
Allowance for Credit Loss, Receivable, Other, Current	1.3	1.5	$ 2.4
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	5.6	4.7
Accounts Receivable, Allowance for Credit Loss, Writeoff	(8.5)	(10.1)
Accounts Receivable, Allowance for Credit Loss, Recovery	$ 2.7	$ 4.5