Revenue Recognition (Schedule of Allowance for Doubtful Accounts) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Allowance for Credit Loss, Receivable, Other, Current	$ 22.1	$ 27.8	$ 25.9	$ 30.9
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	28.0	29.3
Accounts Receivable, Allowance for Credit Loss, Writeoff	(58.4)	(64.9)
Accounts Receivable, Allowance for Credit Loss, Recovery	26.6	32.5
Entergy Arkansas [Member]
Disaggregation of Revenue [Line Items]
Allowance for Credit Loss, Receivable, Other, Current	5.1	5.6	7.2	6.5
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	5.5	5.4
Accounts Receivable, Allowance for Credit Loss, Writeoff	(14.4)	(16.5)
Accounts Receivable, Allowance for Credit Loss, Recovery	6.8	10.2
Entergy Louisiana [Member]
Disaggregation of Revenue [Line Items]
Allowance for Credit Loss, Receivable, Other, Current	5.7	7.6	6.1	7.6
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	10.4	12.2
Accounts Receivable, Allowance for Credit Loss, Writeoff	(19.2)	(25.9)
Accounts Receivable, Allowance for Credit Loss, Recovery	8.4	13.7
Entergy Mississippi [Member]
Disaggregation of Revenue [Line Items]
Allowance for Credit Loss, Receivable, Other, Current	2.7	3.0	3.3	2.5
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	4.0	3.8
Accounts Receivable, Allowance for Credit Loss, Writeoff	(9.5)	(5.7)
Accounts Receivable, Allowance for Credit Loss, Recovery	4.9	2.4
Entergy New Orleans [Member]
Disaggregation of Revenue [Line Items]
Allowance for Credit Loss, Receivable, Other, Current	6.9	9.2	7.8	11.9
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	3.4	3.6
Accounts Receivable, Allowance for Credit Loss, Writeoff	(8.6)	(8.6)
Accounts Receivable, Allowance for Credit Loss, Recovery	4.3	2.3
Entergy Texas [Member]
Disaggregation of Revenue [Line Items]
Allowance for Credit Loss, Receivable, Other, Current	1.7	2.4	$ 1.5	$ 2.4
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	4.7	4.3
Accounts Receivable, Allowance for Credit Loss, Writeoff	(6.7)	(8.2)
Accounts Receivable, Allowance for Credit Loss, Recovery	$ 2.2	$ 3.9