Revenue Recognition (Allowance for Doubtful Accounts) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Allowance for Credit Loss, Receivable, Other, Current	$ 25.9	$ 30.9	$ 68.6
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	38.7	40.6
Accounts Receivable, Allowance for Credit Loss, Writeoff	(83.1)	(112.5)
Accounts Receivable, Allowance for Credit Loss, Recovery	39.4	34.2
Entergy Arkansas [Member]
Allowance for Credit Loss, Receivable, Other, Current	7.2	6.5	13.1
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	9.4	14.9
Accounts Receivable, Allowance for Credit Loss, Writeoff	(20.6)	(31.2)
Accounts Receivable, Allowance for Credit Loss, Recovery	11.9	9.7
Entergy Louisiana [Member]
Allowance for Credit Loss, Receivable, Other, Current	6.1	7.6	29.2
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	13.9	10.7
Accounts Receivable, Allowance for Credit Loss, Writeoff	(31.3)	(45.1)
Accounts Receivable, Allowance for Credit Loss, Recovery	15.9	12.8
Entergy New Orleans [Member]
Allowance for Credit Loss, Receivable, Other, Current	7.8	11.9	13.3
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	3.4	7.7
Accounts Receivable, Allowance for Credit Loss, Writeoff	(10.7)	(13.5)
Accounts Receivable, Allowance for Credit Loss, Recovery	3.2	4.4
Entergy Mississippi [Member]
Allowance for Credit Loss, Receivable, Other, Current	3.3	2.5	7.2
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	7.3	3.2
Accounts Receivable, Allowance for Credit Loss, Writeoff	(10.4)	(12.1)
Accounts Receivable, Allowance for Credit Loss, Recovery	3.9	4.2
Entergy Texas [Member]
Allowance for Credit Loss, Receivable, Other, Current	1.5	2.4	$ 5.8
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	4.7	4.1
Accounts Receivable, Allowance for Credit Loss, Writeoff	(10.1)	(10.6)
Accounts Receivable, Allowance for Credit Loss, Recovery	$ 4.5	$ 3.1