Revenue Recognition (Allowance for Doubtful Accounts) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Allowance for Doubtful Other Receivables, Current	$ 25.6	$ 109.1	$ 68.6	$ 117.7
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	11.0	25.9
Accounts Receivable, Allowance for Credit Loss, Writeoff	(75.5)	(39.5)
Accounts Receivable, Allowance for Credit Loss, Recovery	21.5	5.0
Incremental bad debt expenses resulting from the COVID-19 pandemic deferred as regulatory assets	(8.9)	8.7
Entergy Arkansas [Member]
Disaggregation of Revenue [Line Items]
Allowance for Doubtful Other Receivables, Current	6.2	22.4	13.1	18.3
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	8.2	5.5
Accounts Receivable, Allowance for Credit Loss, Writeoff	(21.8)	(2.8)
Accounts Receivable, Allowance for Credit Loss, Recovery	6.7	1.4
Incremental bad debt expenses resulting from the COVID-19 pandemic deferred as regulatory assets	3.9	0.8
Entergy Louisiana [Member]
Disaggregation of Revenue [Line Items]
Allowance for Doubtful Other Receivables, Current	7.7	39.8	29.2	45.7
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	0.4	11.7
Accounts Receivable, Allowance for Credit Loss, Writeoff	(29.8)	(19.5)
Accounts Receivable, Allowance for Credit Loss, Recovery	7.9	1.9
Incremental bad debt expenses resulting from the COVID-19 pandemic deferred as regulatory assets	(8.5)	5.9
Entergy Mississippi [Member]
Disaggregation of Revenue [Line Items]
Allowance for Doubtful Other Receivables, Current	2.2	13.6	7.2	19.5
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	0.2	1.7
Accounts Receivable, Allowance for Credit Loss, Writeoff	(7.4)	(8.8)
Accounts Receivable, Allowance for Credit Loss, Recovery	2.2	1.2
Entergy New Orleans [Member]
Disaggregation of Revenue [Line Items]
Allowance for Doubtful Other Receivables, Current	6.9	21.1	13.3	17.4
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	0.9	4.6
Accounts Receivable, Allowance for Credit Loss, Writeoff	(10.4)	(1.1)
Accounts Receivable, Allowance for Credit Loss, Recovery	3.1	0.2
Incremental bad debt expenses resulting from the COVID-19 pandemic deferred as regulatory assets	(3.0)	0.7
Entergy Texas [Member]
Disaggregation of Revenue [Line Items]
Allowance for Doubtful Other Receivables, Current	2.6	12.2	$ 5.8	$ 16.8
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	1.3	2.4
Accounts Receivable, Allowance for Credit Loss, Writeoff	(6.1)	(7.3)
Accounts Receivable, Allowance for Credit Loss, Recovery	1.6	0.3
Incremental bad debt expenses resulting from the COVID-19 pandemic deferred as regulatory assets	$ (1.3)	$ 1.3