Revenue Recognition (Allowance for Doubtful Accounts) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Allowance for Doubtful Other Receivables, Current	$ 23.3	$ 31.5	$ 30.9	$ 68.6
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	6.1	(5.9)
Accounts Receivable, Allowance for Credit Loss, Writeoff	(34.4)	(45.3)
Accounts Receivable, Allowance for Credit Loss, Recovery	20.7	14.1
COVID-19 Pandemic [Member]
Disaggregation of Revenue [Line Items]
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)		(11.0)
Entergy Arkansas [Member]
Disaggregation of Revenue [Line Items]
Allowance for Doubtful Other Receivables, Current	5.3	6.5	6.5	13.1
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	1.3	3.7
Accounts Receivable, Allowance for Credit Loss, Writeoff	(9.4)	(14.4)
Accounts Receivable, Allowance for Credit Loss, Recovery	6.9	4.1
Entergy Arkansas [Member] | COVID-19 Pandemic [Member]
Disaggregation of Revenue [Line Items]
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)		1.8
Entergy Louisiana [Member]
Disaggregation of Revenue [Line Items]
Allowance for Doubtful Other Receivables, Current	5.7	11.1	7.6	29.2
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	4.0	(6.1)
Accounts Receivable, Allowance for Credit Loss, Writeoff	(15.1)	(17.5)
Accounts Receivable, Allowance for Credit Loss, Recovery	9.2	5.5
Entergy Louisiana [Member] | COVID-19 Pandemic [Member]
Disaggregation of Revenue [Line Items]
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)		(8.5)
Entergy Mississippi [Member]
Disaggregation of Revenue [Line Items]
Allowance for Doubtful Other Receivables, Current	2.2	3.4	2.5	7.2
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	0.7	(0.9)
Accounts Receivable, Allowance for Credit Loss, Writeoff	(1.7)	(4.1)
Accounts Receivable, Allowance for Credit Loss, Recovery	0.7	1.2
Entergy New Orleans [Member]
Disaggregation of Revenue [Line Items]
Allowance for Doubtful Other Receivables, Current	8.3	7.7	11.9	13.3
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	(1.1)	(2.4)
Accounts Receivable, Allowance for Credit Loss, Writeoff	(3.4)	(5.4)
Accounts Receivable, Allowance for Credit Loss, Recovery	0.9	2.2
Entergy New Orleans [Member] | COVID-19 Pandemic [Member]
Disaggregation of Revenue [Line Items]
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)		(3.0)
Entergy Texas [Member]
Disaggregation of Revenue [Line Items]
Allowance for Doubtful Other Receivables, Current	1.8	2.8	$ 2.4	$ 5.8
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	1.2	(0.2)
Accounts Receivable, Allowance for Credit Loss, Writeoff	(4.8)	(3.9)
Accounts Receivable, Allowance for Credit Loss, Recovery	$ 3.0	1.1
Entergy Texas [Member] | COVID-19 Pandemic [Member]
Disaggregation of Revenue [Line Items]
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)		$ (1.3)