Income Taxes (Schedule Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross balance January 1	$ 7,383,154	$ 7,181,482	$ 4,871,846
Additions based on tax positions related to the current year	669,207	731,276	2,276,614
Additions for tax positions of prior years	98,591	151,628	506,142
Reductions for tax positions of prior years	(935,735)	(681,232)	(274,600)
Settlements	(1,515,878)	0	(198,520)
Gross balance at December 31	5,699,339	7,383,154	7,181,482
Unrecognized tax benefits net of unused tax attributes and payments	979,125	1,541,567	1,213,490
Remaining balances of unrecognized tax benefits, effective income tax rates	3,491,000	4,962,000	5,020,000
Net operating loss carryforwards	1,580,109	1,133,197
Offset to gross unrecognized tax benefits, credit and loss carryforward	(4,710,214)	(5,831,587)	(5,957,992)
Cash Paid To Taxing Authorities	10,000	10,000	10,000
Entergy Arkansas [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross balance January 1	1,341,242	1,298,662
Additions based on tax positions related to the current year	9,403	84,335	1,430,828
Additions for tax positions of prior years	13,400	20,399	31,612
Reductions for tax positions of prior years	(11,346)	(62,154)	(21,619)
Unrecognized Tax Benefits, Increase Resulting from Settlements with Taxing Authorities	11,936
Settlements			(24,443)
Gross balance at December 31	1,364,635	1,341,242	1,298,662
Unrecognized tax benefits net of unused tax attributes and payments	252,007	207,055	124,823
Net operating loss carryforwards	119,555	112,658
Offset to gross unrecognized tax benefits, credit and loss carryforward	(1,112,628)	(1,134,187)	(1,173,839)
Unrecognized Tax Expense				$ (117,716)
Entergy Louisiana [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross balance January 1	2,381,653	2,400,171	2,518,457
Additions based on tax positions related to the current year	35,681	28,705	30,577
Additions for tax positions of prior years	10,508	25,090	77,372
Reductions for tax positions of prior years	(679,601)	(72,313)	(158,510)
Settlements	(1,107,946)		(67,725)
Gross balance at December 31	640,295	2,381,653	2,400,171
Unrecognized tax benefits net of unused tax attributes and payments	0	808,396	802,345
Net operating loss carryforwards	363,806	65,178
Offset to gross unrecognized tax benefits, credit and loss carryforward	(640,295)	(1,573,257)	(1,597,826)
Entergy Mississippi [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross balance January 1	566,287	508,765	15,122
Additions based on tax positions related to the current year	5,619	68,594	493,039
Additions for tax positions of prior years	1,156	1,651	3,878
Reductions for tax positions of prior years	(24,173)	(12,723)	(3,253)
Unrecognized Tax Benefits, Increase Resulting from Settlements with Taxing Authorities	828
Settlements			(21)
Gross balance at December 31	549,717	566,287	508,765
Unrecognized tax benefits net of unused tax attributes and payments	84,038	59,311	30,497
Net operating loss carryforwards	54,262	21,492
Offset to gross unrecognized tax benefits, credit and loss carryforward	(465,679)	(506,976)	(478,268)
Entergy New Orleans [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross balance January 1	716,773	686,687	679,544
Additions based on tax positions related to the current year	2,430	40,676	2,261
Additions for tax positions of prior years	294	489	12,972
Reductions for tax positions of prior years	(80,267)	(11,079)	(8,081)
Unrecognized Tax Benefits, Increase Resulting from Settlements with Taxing Authorities	316
Settlements			(9)
Gross balance at December 31	639,546	716,773	686,687
Unrecognized tax benefits net of unused tax attributes and payments	187,624	271,343	265,874
Net operating loss carryforwards	26,564	5,056
Offset to gross unrecognized tax benefits, credit and loss carryforward	(451,922)	(445,430)	(420,813)
Entergy Texas [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross balance January 1	21,406	17,802	16,399
Additions based on tax positions related to the current year	504,362	2,312	1,978
Additions for tax positions of prior years	799	1,299	1,722
Reductions for tax positions of prior years	(5,559)	(7)	(2,262)
Unrecognized Tax Benefits, Increase Resulting from Settlements with Taxing Authorities	924
Settlements			(35)
Gross balance at December 31	521,932	21,406	17,802
Unrecognized tax benefits net of unused tax attributes and payments	14,212	17,462	14,603
Net operating loss carryforwards	53,052	0
Offset to gross unrecognized tax benefits, credit and loss carryforward	(507,720)	(3,944)	(3,199)
System Energy [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross balance January 1	473,331	467,487	445,511
Additions based on tax positions related to the current year	4,013	5,496	18,271
Additions for tax positions of prior years	4,606	2,186	7,255
Reductions for tax positions of prior years	(41,466)	(1,838)	(3,253)
Settlements	(418,832)		(297)
Gross balance at December 31	21,652	473,331	467,487
Unrecognized tax benefits net of unused tax attributes and payments	14,239	464,939	425,259
Net operating loss carryforwards	0	0
Offset to gross unrecognized tax benefits, credit and loss carryforward	$ (7,413)	$ (8,392)	$ (42,228)