Income Taxes (Significant Components Of Accumulated Deferred Income Taxes And Taxes Accrued) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Plant basis differences - net	$ (4,111,761)	$ (3,835,211)
Regulatory assets for income taxes - net	(389,573)	(370,484)
Nuclear decommissioning trusts	(1,015,542)	(1,128,140)
Pension, net funding	(348,260)	(307,626)
Combined unitary state taxes	(11,519)	(9,440)
Power purchase agreements	0	(73,335)
Deferred Tax Liability, Deferred Fuel	(8,360)	(29,953)
Other	(445,378)	(248,997)
Total	(6,330,393)	(6,003,186)
Regulatory liabilities	806,777	895,756
Pension and other post-employment benefits	297,272	305,736
Sale and leaseback	102,420	121,473
Compensation	87,355	86,461
Accumulated deferred investment tax credit	56,013	57,643
Provision for allowances and contingencies	126,886	135,631
Deferred Tax Assets, Power Purchase Arrangements	231,502	0
Deferred Tax Asset, Unbilled Revenue	(10,218)	43,762
Net operating loss carryforwards	1,133,197	628,165
Capital losses and miscellaneous tax credits	22,597	20,549
Valuation allowance	(303,307)	(243,726)
Other	289,557	125,522
Total	3,769,302	3,247,555
Non-current accrued taxes (including unrecognized tax benefits)	(1,775,638)	(1,296,928)
Deferred tax asset Nuclear Decommissioning Liabilities	929,251	1,070,583
Deferred Tax Liabilities, Net, Noncurrent	(4,336,729)	(4,052,559)
Entergy Arkansas [Member]
Plant basis differences - net	(979,033)	(966,791)
Regulatory assets for income taxes - net	(170,949)	(169,482)
Nuclear decommissioning trusts	(120,306)	(77,664)
Pension, net funding	(102,685)	(91,962)
Deferred fuel	0	(5,801)
Other	(82,682)	(41,025)
Total	(1,455,655)	(1,352,725)
Regulatory liabilities	250,410	247,964
Deferred tax Liability, Accrued Tax Expense, Compensation and Benefits Pensions	(21,828)	(19,068)
Sale and leaseback	0	0
Compensation	2,550	1,708
Accumulated deferred investment tax credit	8,285	8,599
Provision for allowances and contingencies	5,365	9,877
Deferred Tax Assets, Power Purchase Arrangements	(15,087)	(17,223)
Net operating loss carryforwards	112,658	6,338
Other	12,541	7,977
Total	471,869	353,122
Accrued Income Taxes, Noncurrent	(199,340)	(85,942)
Deferred Tax Assets, Deferred Income	5,897	7,471
Deferred Tax Assets, Capital Losses and Miscellaneous Tax Credits	0
Deferred tax asset Nuclear Decommissioning Liabilities	111,078	99,479
Deferred Tax Liabilities, Net, Noncurrent	1,183,126	1,085,545
Entergy Louisiana [Member]
Plant basis differences - net	(1,987,025)	(1,893,831)
Regulatory assets for income taxes - net	(79,117)	(74,917)
Nuclear decommissioning trusts	(113,830)	(71,470)
Pension, net funding	(98,743)	(92,693)
Deferred fuel	(2,637)	(6,974)
Other	(94,139)	(34,700)
Total	(2,375,491)	(2,174,585)
Regulatory liabilities	283,507	339,126
Pension and other post-employment benefits	74,881	80,102
Sale and leaseback	0	18,999
Compensation	3,670	1,959
Accumulated deferred investment tax credit	32,534	33,928
Provision for allowances and contingencies	77,298	81,108
Deferred Tax Assets, Power Purchase Arrangements	18,004	19,385
Net operating loss carryforwards	65,178	20,118
Other	35,401	23,412
Total	618,692	649,530
Accrued Income Taxes, Noncurrent	(707,714)	(701,666)
Deferred Tax Liabilities, Deferred Expense	(28,081)	(17,345)
Deferred Tax Assets, Capital Losses and Miscellaneous Tax Credits	0
Deferred tax asset Nuclear Decommissioning Liabilities	56,300	48,738
Deferred Tax Liabilities, Net, Noncurrent	2,464,513	2,226,721
Entergy Mississippi [Member]
Plant basis differences - net	(565,202)	(579,319)
Regulatory assets for income taxes - net	(10,528)	(1,732)
Nuclear decommissioning trusts	0	0
Pension, net funding	(27,325)	(24,398)
Deferred fuel	(609)	(11,819)
Other	(27,905)	(13,443)
Total	(631,569)	(630,711)
Regulatory liabilities	53,421	72,570
Deferred tax Liability, Accrued Tax Expense, Compensation and Benefits Pensions	(5,844)	(5,405)
Sale and leaseback	0	0
Compensation	1,625	1,265
Accumulated deferred investment tax credit	2,396	2,541
Provision for allowances and contingencies	12,963	13,412
Deferred Tax Assets, Power Purchase Arrangements	1,147	1,140
Net operating loss carryforwards	21,492	4,896
Other	999	1,610
Total	92,959	97,556
Accrued Income Taxes, Noncurrent	(56,222)	(18,714)
Deferred Tax Assets, Deferred Income	4,715	5,527
Deferred Tax Assets, Capital Losses and Miscellaneous Tax Credits	45
Deferred tax asset Nuclear Decommissioning Liabilities	0	0
Deferred Tax Liabilities, Net, Noncurrent	594,832	551,869
Entergy New Orleans [Member]
Plant basis differences - net	(133,073)	(135,143)
Regulatory assets for income taxes - net	(16,867)	(20,009)
Nuclear decommissioning trusts	0	0
Pension, net funding	(11,859)	(11,885)
Deferred fuel	(666)	(1,701)
Other	(25,909)	(7,640)
Total	(188,374)	(176,378)
Regulatory liabilities	33,258	40,181
Deferred tax Liability, Accrued Tax Expense, Compensation and Benefits Pensions	(12,666)	(11,371)
Sale and leaseback	0	0
Compensation	496	512
Accumulated deferred investment tax credit	556	579
Provision for allowances and contingencies	24,022	23,962
Deferred Tax Assets, Power Purchase Arrangements	7,961	12,155
Net operating loss carryforwards	5,056	480
Other	9,027	12,181
Total	69,138	79,315
Accrued Income Taxes, Noncurrent	(235,300)	(226,532)
Deferred Tax Assets, Deferred Income	1,428	636
Deferred Tax Assets, Capital Losses and Miscellaneous Tax Credits	0
Deferred tax asset Nuclear Decommissioning Liabilities	0	0
Deferred Tax Liabilities, Net, Noncurrent	354,536	323,595
Entergy Texas [Member]
Plant basis differences - net	(551,365)	(544,282)
Regulatory assets for income taxes - net	(59,745)	(57,777)
Nuclear decommissioning trusts	0	0
Pension, net funding	(19,961)	(20,331)
Deferred fuel	(4,380)	(2,835)
Other	2,059	(6,085)
Total	(633,392)	(631,310)
Regulatory liabilities	65,602	86,032
Deferred tax Liability, Accrued Tax Expense, Compensation and Benefits Pensions	(15,406)	(14,215)
Sale and leaseback	0	0
Compensation	1,282	995
Accumulated deferred investment tax credit	2,217	2,347
Provision for allowances and contingencies	4,024	5,579
Deferred Tax Assets, Power Purchase Arrangements	26	(18)
Net operating loss carryforwards	0	261
Other	2,004	2,127
Total	65,293	90,124
Accrued Income Taxes, Noncurrent	(17,314)	(11,349)
Deferred Tax Assets, Deferred Income	5,544	7,016
Deferred Tax Assets, Capital Losses and Miscellaneous Tax Credits	0
Deferred tax asset Nuclear Decommissioning Liabilities	0	0
Deferred Tax Liabilities, Net, Noncurrent	585,413	552,535
System Energy [Member]
Plant basis differences - net	(380,594)	(403,809)
Regulatory assets for income taxes - net	(52,662)	(46,627)
Nuclear decommissioning trusts	(100,621)	(86,882)
Pension, net funding	(21,609)	(18,898)
Deferred fuel	(55)	(312)
Other	(7,350)	(4,544)
Total	(562,891)	(561,072)
Regulatory liabilities	121,011	110,370
Deferred tax Liability, Accrued Tax Expense, Compensation and Benefits Pensions	(898)	(632)
Sale and leaseback	102,480	102,481
Compensation	75	(260)
Accumulated deferred investment tax credit	10,025	9,649
Provision for allowances and contingencies	0	0
Deferred Tax Assets, Power Purchase Arrangements	0	0
Net operating loss carryforwards	0	0
Other	3	4
Total	293,186	268,255
Accrued Income Taxes, Noncurrent	(544,235)	(512,479)
Deferred Tax Assets, Deferred Income	0	0
Deferred Tax Assets, Capital Losses and Miscellaneous Tax Credits	7,857
Deferred tax asset Nuclear Decommissioning Liabilities	52,633	46,643
Deferred Tax Liabilities, Net, Noncurrent	$ 813,940	$ 805,296