Income Taxes (Schedule Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	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	$ 7,181,482	$ 4,871,846	$ 3,909,855
Additions based on tax positions related to the current year	731,276	2,276,614	1,120,687
Additions for tax positions of prior years	151,628	506,142	283,683
Reductions for tax positions of prior years	(681,232)	(274,600)	(442,379)
Settlements	0	(198,520)	0
Gross balance at December 31	7,383,154	7,181,482	4,871,846
Unrecognized tax benefits net of unused tax attributes and payments	1,541,567	1,213,490	916,322
Remaining balances of unrecognized tax benefits, effective income tax rates	4,962,000	5,020,000	3,410,000
Net operating loss carryforwards	1,133,197	628,165
Offset to gross unrecognized tax benefits, credit and loss carryforward	(5,831,587)	(5,957,992)	(3,945,524)
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
Unrecognized Tax Expense		1,298,662	(117,716)
Additions based on tax positions related to the current year	84,335	1,430,828	8,974
Additions for tax positions of prior years	20,399	31,612	3,682
Reductions for tax positions of prior years	(62,154)	(21,619)	(132,875)
Settlements		(24,443)
Gross balance at December 31	1,341,242
Unrecognized tax benefits net of unused tax attributes and payments	207,055	124,823	(117,716)
Net operating loss carryforwards	112,658	6,338
Offset to gross unrecognized tax benefits, credit and loss carryforward	(1,134,187)	(1,173,839)	0
Entergy Louisiana [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross balance January 1	2,400,171	2,518,457	2,440,339
Additions based on tax positions related to the current year	28,705	30,577	32,843
Additions for tax positions of prior years	25,090	77,372	235,331
Reductions for tax positions of prior years	(72,313)	(158,510)	(190,056)
Settlements		(67,725)
Gross balance at December 31	2,381,653	2,400,171	2,518,457
Unrecognized tax benefits net of unused tax attributes and payments	808,396	802,345	926,550
Net operating loss carryforwards	65,178	20,118
Offset to gross unrecognized tax benefits, credit and loss carryforward	(1,573,257)	(1,597,826)	(1,591,907)
Entergy Mississippi [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross balance January 1	508,765	15,122	12,206
Additions based on tax positions related to the current year	68,594	493,039	2,105
Additions for tax positions of prior years	1,651	3,878	1,267
Reductions for tax positions of prior years	(12,723)	(3,253)	(456)
Settlements		(21)
Gross balance at December 31	566,287	508,765	15,122
Unrecognized tax benefits net of unused tax attributes and payments	59,311	30,497	0
Net operating loss carryforwards	21,492	4,896
Offset to gross unrecognized tax benefits, credit and loss carryforward	(506,976)	(478,268)	(15,122)
Entergy New Orleans [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross balance January 1	686,687	679,544	166,230
Additions based on tax positions related to the current year	40,676	2,261	509,183
Additions for tax positions of prior years	489	12,972	13,364
Reductions for tax positions of prior years	(11,079)	(8,081)	(9,233)
Settlements		(9)
Gross balance at December 31	716,773	686,687	679,544
Unrecognized tax benefits net of unused tax attributes and payments	271,343	265,874	238,170
Net operating loss carryforwards	5,056	480
Offset to gross unrecognized tax benefits, credit and loss carryforward	(445,430)	(420,813)	(441,374)
Entergy Texas [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross balance January 1	17,802	16,399	15,946
Additions based on tax positions related to the current year	2,312	1,978	1,747
Additions for tax positions of prior years	1,299	1,722	3,115
Reductions for tax positions of prior years	(7)	(2,262)	(4,409)
Settlements		(35)
Gross balance at December 31	21,406	17,802	16,399
Unrecognized tax benefits net of unused tax attributes and payments	17,462	14,603	15,761
Net operating loss carryforwards	0	261
Offset to gross unrecognized tax benefits, credit and loss carryforward	(3,944)	(3,199)	(638)
System Energy [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross balance January 1	467,487	445,511	472,372
Additions based on tax positions related to the current year	5,496	18,271	909
Additions for tax positions of prior years	2,186	7,255	1,432
Reductions for tax positions of prior years	(1,838)	(3,253)	(29,202)
Settlements		(297)
Gross balance at December 31	473,331	467,487	445,511
Unrecognized tax benefits net of unused tax attributes and payments	464,939	425,259	432,975
Net operating loss carryforwards	0	0
Offset to gross unrecognized tax benefits, credit and loss carryforward	$ (8,392)	$ (42,228)	$ (12,536)