Schedule II - Valuation And Qualifying Accounts (Details) - Allowance for Doubtful Accounts Receivable [Member] - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		$ 7,322	$ 13,587	$ 11,924
Valuation Allowances And Reserves Charged To Cost And Expense And Other Accounts		2,806	3,936	4,211
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	[1]	2,724	10,201	2,548
Balance at End of Period		7,404	7,322	13,587
Entergy Arkansas [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		1,264	1,063	1,211
Valuation Allowances And Reserves Charged To Cost And Expense And Other Accounts		1,000	810	503
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	[1]	1,095	609	651
Balance at End of Period		1,169	1,264	1,063
Entergy New Orleans [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		3,222	3,057	3,059
Valuation Allowances And Reserves Charged To Cost And Expense And Other Accounts		316	187	152
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	[1]	312	22	154
Balance at End of Period		3,226	3,222	3,057
Entergy Mississippi [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		563	574	549
Valuation Allowances And Reserves Charged To Cost And Expense And Other Accounts		406	265	255
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	[1]	333	276	230
Balance at End of Period		636	563	574
Entergy Louisiana [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		1,813	8,430	6,277
Valuation Allowances And Reserves Charged To Cost And Expense And Other Accounts		762	2,395	3,108
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	[1]	673	9,012	955
Balance at End of Period		1,902	1,813	8,430
Entergy Texas [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		461	463	828
Valuation Allowances And Reserves Charged To Cost And Expense And Other Accounts		321	279	192
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	[1]	311	281	557
Balance at End of Period		$ 471	$ 461	$ 463

[1] (1) Deductions represent write-offs of accounts receivable balances and are reduced by recoveries of amounts previously written off.