Income Taxes (Schedule Of Income Tax Expenses From Continuing Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Federal	$ 29,595	$ 45,249	$ 77,166
Foreign	0	68	97
State	15,478	(14,960)	157,829
Total	45,073	30,357	235,092
Deferred and non-current -- net	505,010	(840,465)	(864,799)
Investment tax credit adjustments - net	(7,513)	(7,151)	(13,220)
Income Tax Expense (Benefit)	542,570	(817,259)	(642,927)
Entergy Arkansas [Member]
Federal	16,086	(14,748)	66,966
State	9,191	2,805	6,265
Total	25,277	(11,943)	73,231
Deferred and non-current -- net	69,753	120,942	(31,463)
Investment tax credit adjustments - net	(1,226)	(1,226)	(1,227)
Income Tax Expense (Benefit)	93,804	107,773	40,541
Entergy Louisiana [Member]
Federal	(84,250)	(124,113)	101,382
State	1,480	10,757	35,406
Total	(82,770)	(113,356)	136,788
Deferred and non-current -- net	572,988	208,157	47,220
Investment tax credit adjustments - net	(4,920)	(5,067)	(5,337)
Income Tax Expense (Benefit)	485,298	89,734	178,671
Entergy Mississippi [Member]
Federal	(8,845)	10,603	25,628
State	(924)	2,257	6,832
Total	(9,769)	12,860	32,460
Deferred and non-current -- net	83,501	46,984	31,149
Investment tax credit adjustments - net	187	4,010	(1,737)
Income Tax Expense (Benefit)	73,919	63,854	61,872
Entergy New Orleans [Member]
Federal	(30,635)	(91,067)	(9,346)
State	(728)	566	1,784
Total	(31,363)	(90,501)	(7,562)
Deferred and non-current -- net	62,946	119,345	32,890
Investment tax credit adjustments - net	1,695	(139)	(138)
Income Tax Expense (Benefit)	33,278	28,705	25,190
Entergy Texas [Member]
Federal	6,034	19,656	53,313
State	310	1,374	2,450
Total	6,344	21,030	55,763
Deferred and non-current -- net	43,102	42,982	(17,599)
Investment tax credit adjustments - net	(965)	(915)	(914)
Income Tax Expense (Benefit)	48,481	63,097	37,250
System Energy [Member]
Federal	47,674	29,628	(63,302)
State	5,314	(25,825)	26,755
Total	52,988	3,803	(36,547)
Deferred and non-current -- net	19,243	71,051	93,491
Investment tax credit adjustments - net	(2,262)	(3,793)	(3,867)
Income Tax Expense (Benefit)	$ 69,969	$ 71,061	$ 53,077