Revenue Recognition (Allowance for Doubtful Accounts) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance for Doubtful Other Receivables, Current	$ 68.6	$ 117.7	$ 7.4
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	56.2	109.0
Accounts Receivable, Allowance for Credit Loss, Writeoff	(118.2)	(8.6)
Accounts Receivable, Allowance for Credit Loss, Recovery	12.9	9.9
Regulatory asset related to incremental bad debt expense resulting from COVID-19	30.4	87.1
Entergy Arkansas [Member]
Allowance for Doubtful Other Receivables, Current	13.1	18.3	1.2
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	30.4	16.2
Accounts Receivable, Allowance for Credit Loss, Writeoff	(38.9)	(1.8)
Accounts Receivable, Allowance for Credit Loss, Recovery	3.3	2.7
Regulatory asset related to costs associated with COVID-19 pandemic	32.6
Regulatory asset related to incremental bad debt expense resulting from COVID-19	22.2	10.5
Entergy Louisiana [Member]
Allowance for Doubtful Other Receivables, Current	29.2	45.7	1.9
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	16.7	43.7
Accounts Receivable, Allowance for Credit Loss, Writeoff	(38.3)	(3.5)
Accounts Receivable, Allowance for Credit Loss, Recovery	5.1	3.6
Regulatory asset related to costs associated with COVID-19 pandemic	56.3
Regulatory asset related to incremental bad debt expense resulting from COVID-19	7.4	36.0
Entergy New Orleans [Member]
Allowance for Doubtful Other Receivables, Current	13.3	17.4	3.2
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	7.3	14.1
Accounts Receivable, Allowance for Credit Loss, Writeoff	(12.3)	(1.0)
Accounts Receivable, Allowance for Credit Loss, Recovery	0.9	1.1
Regulatory asset related to costs associated with COVID-19 pandemic	17.4
Regulatory asset related to incremental bad debt expense resulting from COVID-19	4.3	12.2
Entergy Mississippi [Member]
Allowance for Doubtful Other Receivables, Current	7.2	19.5	0.6
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	0.7	18.8
Accounts Receivable, Allowance for Credit Loss, Writeoff	(15.7)	(1.2)
Accounts Receivable, Allowance for Credit Loss, Recovery	2.7	1.3
Regulatory asset related to costs associated with COVID-19 pandemic	15.0
Regulatory asset related to incremental bad debt expense resulting from COVID-19	(2.4)	15.5
Entergy Texas [Member]
Allowance for Doubtful Other Receivables, Current	5.8	16.8	$ 0.5
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	1.1	16.2
Accounts Receivable, Allowance for Credit Loss, Writeoff	(13.0)	(1.1)
Accounts Receivable, Allowance for Credit Loss, Recovery	0.9	1.2
Regulatory asset related to costs associated with COVID-19 pandemic	11.7
Regulatory asset related to incremental bad debt expense resulting from COVID-19	$ (1.1)	$ 12.9