Schedule II - Valuation And Qualifying Accounts (Details) - Allowance for Doubtful Accounts Receivable [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 7,404	$ 7,322	$ 13,587
Valuation Allowances And Reserves Charged To Cost And Expense And Other Accounts	111,687	2,806	3,936
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	1,297	2,724	10,201
Balance at End of Period	117,794	7,404	7,322
Entergy Arkansas [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	1,169	1,264	1,063
Valuation Allowances And Reserves Charged To Cost And Expense And Other Accounts	17,307	1,000	810
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	142	1,095	609
Balance at End of Period	18,334	1,169	1,264
Entergy New Orleans [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	3,226	3,222	3,057
Valuation Allowances And Reserves Charged To Cost And Expense And Other Accounts	14,204	316	187
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	0	312	22
Balance at End of Period	17,430	3,226	3,222
Entergy Mississippi [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	636	563	574
Valuation Allowances And Reserves Charged To Cost And Expense And Other Accounts	19,081	406	265
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	190	333	276
Balance at End of Period	19,527	636	563
Entergy Louisiana [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	1,902	1,813	8,430
Valuation Allowances And Reserves Charged To Cost And Expense And Other Accounts	44,542	762	2,395
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	751	673	9,012
Balance at End of Period	45,693	1,902	1,813
Entergy Texas [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	471	461	463
Valuation Allowances And Reserves Charged To Cost And Expense And Other Accounts	16,554	321	279
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	215	311	281
Balance at End of Period	$ 16,810	$ 471	$ 461