Revenue Recognition Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss, Current	$ 8,521	$ 7,404
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	6,600
Accounts Receivable, Allowance for Credit Loss, Writeoff	(8,400)
Accounts Receivable, Allowance for Credit Loss, Recovery	2,900
Entergy Arkansas [Member]
Accounts Receivable, Allowance for Credit Loss, Current	1,515	1,169
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	1,200
Accounts Receivable, Allowance for Credit Loss, Writeoff	(1,800)
Accounts Receivable, Allowance for Credit Loss, Recovery	900
Entergy Louisiana [Member]
Accounts Receivable, Allowance for Credit Loss, Current	2,452	1,902
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	3,000
Accounts Receivable, Allowance for Credit Loss, Writeoff	(3,500)
Accounts Receivable, Allowance for Credit Loss, Recovery	1,100
Entergy Mississippi [Member]
Accounts Receivable, Allowance for Credit Loss, Current	554	636
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	900
Accounts Receivable, Allowance for Credit Loss, Writeoff	(1,200)
Accounts Receivable, Allowance for Credit Loss, Recovery	300
Entergy New Orleans [Member]
Accounts Receivable, Allowance for Credit Loss, Current	3,387	3,226
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	800
Accounts Receivable, Allowance for Credit Loss, Writeoff	(800)
Accounts Receivable, Allowance for Credit Loss, Recovery	200
Entergy Texas [Member]
Accounts Receivable, Allowance for Credit Loss, Current	613	$ 471
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	700
Accounts Receivable, Allowance for Credit Loss, Writeoff	(1,100)
Accounts Receivable, Allowance for Credit Loss, Recovery	$ 500