Income Taxes (Schedule Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross balance January 1	$ 4,871,846	$ 3,909,855	$ 2,611,585
Additions based on tax positions related to the current year	2,276,614	1,120,687	1,532,782
Additions for tax positions of prior years	506,142	283,683	368,404
Reductions for tax positions of prior years	(274,600)	(442,379)	(265,653)
Settlements	(198,520)	0	(337,263)
Gross balance at December 31	7,181,482	4,871,846	3,909,855
Unrecognized tax benefits net of unused tax attributes and payments	1,213,490	916,322	977,770
Remaining balances of unrecognized tax benefits, effective income tax rates	5,020,000	3,410,000	2,670,000
Net operating loss carryforwards	628,165	467,255
Offset to gross unrecognized tax benefits, credit and loss carryforward	(5,957,992)	(3,945,524)	(2,922,085)
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		2,503	25,445
Unrecognized Tax Expense		(117,716)
Additions based on tax positions related to the current year	1,430,828	8,974	16,868
Additions for tax positions of prior years	31,612	3,682	2,463
Reductions for tax positions of prior years	(21,619)	(132,875)	(41,957)
Settlements	(24,443)		(316)
Gross balance at December 31	1,298,662		2,503
Unrecognized tax benefits net of unused tax attributes and payments	124,823	(117,716)	2,503
Net operating loss carryforwards	6,338	16,172
Offset to gross unrecognized tax benefits, credit and loss carryforward	(1,173,839)	0	0
Entergy Louisiana [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross balance January 1	2,518,457	2,440,339	1,690,661
Additions based on tax positions related to the current year	30,577	32,843	931,720
Additions for tax positions of prior years	77,372	235,331	157,586
Reductions for tax positions of prior years	(158,510)	(190,056)	(144,068)
Settlements	(67,725)		(195,560)
Gross balance at December 31	2,400,171	2,518,457	2,440,339
Unrecognized tax benefits net of unused tax attributes and payments	802,345	926,550	657,246
Net operating loss carryforwards	20,118	44
Offset to gross unrecognized tax benefits, credit and loss carryforward	(1,597,826)	(1,591,907)	(1,783,093)
Entergy Mississippi [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross balance January 1	15,122	12,206	19,482
Additions based on tax positions related to the current year	493,039	2,105	2,662
Additions for tax positions of prior years	3,878	1,267	336
Reductions for tax positions of prior years	(3,253)	(456)	(10,219)
Settlements	(21)		(55)
Gross balance at December 31	508,765	15,122	12,206
Unrecognized tax benefits net of unused tax attributes and payments	30,497	0	9,833
Net operating loss carryforwards	4,896	10,255
Offset to gross unrecognized tax benefits, credit and loss carryforward	(478,268)	(15,122)	(2,373)
Entergy New Orleans [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross balance January 1	679,544	166,230	53,897
Additions based on tax positions related to the current year	2,261	509,183	33,912
Additions for tax positions of prior years	12,972	13,364	129,784
Reductions for tax positions of prior years	(8,081)	(9,233)	(29,821)
Settlements	(9)		(21,542)
Gross balance at December 31	686,687	679,544	166,230
Unrecognized tax benefits net of unused tax attributes and payments	265,874	238,170	138,910
Net operating loss carryforwards	480	0
Offset to gross unrecognized tax benefits, credit and loss carryforward	(420,813)	(441,374)	(27,320)
Entergy Texas [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross balance January 1	16,399	15,946	13,462
Additions based on tax positions related to the current year	1,978	1,747	2,002
Additions for tax positions of prior years	1,722	3,115	2,888
Reductions for tax positions of prior years	(2,262)	(4,409)	(1,849)
Settlements	(35)		(557)
Gross balance at December 31	17,802	16,399	15,946
Unrecognized tax benefits net of unused tax attributes and payments	14,603	15,761	15,570
Net operating loss carryforwards	261	1,690
Offset to gross unrecognized tax benefits, credit and loss carryforward	(3,199)	(638)	(376)
System Energy [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross balance January 1	445,511	472,372	478,318
Additions based on tax positions related to the current year	18,271	909	5,318
Additions for tax positions of prior years	7,255	1,432	601
Reductions for tax positions of prior years	(3,253)	(29,202)	(10,266)
Settlements	(297)		(1,599)
Gross balance at December 31	467,487	445,511	472,372
Unrecognized tax benefits net of unused tax attributes and payments	425,259	432,975	382,344
Net operating loss carryforwards	0	0
Offset to gross unrecognized tax benefits, credit and loss carryforward	$ (42,228)	$ (12,536)	$ (90,028)