Revenue Recognition (Allowance for Doubtful Accounts) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Allowance for Doubtful Other Receivables, Current	$ 30.7	$ 96.1	$ 68.6	$ 117.7
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	28.8	43.4
Accounts Receivable, Allowance for Credit Loss, Writeoff	(95.1)	(72.5)
Accounts Receivable, Allowance for Credit Loss, Recovery	28.4	7.5
COVID-19 Pandemic [Member]
Disaggregation of Revenue [Line Items]
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	(6.4)	23.8
Entergy Arkansas [Member]
Disaggregation of Revenue [Line Items]
Allowance for Doubtful Other Receivables, Current	6.3	19.0	13.1	18.3
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	12.1	20.0
Accounts Receivable, Allowance for Credit Loss, Writeoff	(27.3)	(21.4)
Accounts Receivable, Allowance for Credit Loss, Recovery	8.4	2.1
Entergy Arkansas [Member] | COVID-19 Pandemic [Member]
Disaggregation of Revenue [Line Items]
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	6.4	14.0
Entergy Louisiana [Member]
Disaggregation of Revenue [Line Items]
Allowance for Doubtful Other Receivables, Current	9.9	38.1	29.2	45.7
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	8.3	17.7
Accounts Receivable, Allowance for Credit Loss, Writeoff	(38.1)	(28.3)
Accounts Receivable, Allowance for Credit Loss, Recovery	10.5	3.0
Entergy Louisiana [Member] | COVID-19 Pandemic [Member]
Disaggregation of Revenue [Line Items]
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	(8.5)	10.4
Entergy Mississippi [Member]
Disaggregation of Revenue [Line Items]
Allowance for Doubtful Other Receivables, Current	2.1	11.4	7.2	19.5
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	1.5	2.1
Accounts Receivable, Allowance for Credit Loss, Writeoff	(9.8)	(11.8)
Accounts Receivable, Allowance for Credit Loss, Recovery	3.2	1.6
Entergy Mississippi [Member] | COVID-19 Pandemic [Member]
Disaggregation of Revenue [Line Items]
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)		(0.1)
Entergy New Orleans [Member]
Disaggregation of Revenue [Line Items]
Allowance for Doubtful Other Receivables, Current	9.4	18.6	13.3	17.4
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	4.0	2.0
Accounts Receivable, Allowance for Credit Loss, Writeoff	(11.7)	(1.3)
Accounts Receivable, Allowance for Credit Loss, Recovery	3.8	0.5
Entergy New Orleans [Member] | COVID-19 Pandemic [Member]
Disaggregation of Revenue [Line Items]
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	(3.0)	(0.5)
Entergy Texas [Member]
Disaggregation of Revenue [Line Items]
Allowance for Doubtful Other Receivables, Current	3.0	9.0	$ 5.8	$ 16.8
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	2.9	1.6
Accounts Receivable, Allowance for Credit Loss, Writeoff	(8.2)	(9.7)
Accounts Receivable, Allowance for Credit Loss, Recovery	2.5	$ 0.3
Entergy Texas [Member] | COVID-19 Pandemic [Member]
Disaggregation of Revenue [Line Items]
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	$ (1.3)