Income Taxes (Significant Components Of Accumulated Deferred Income Taxes And Taxes Accrued) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Plant basis differences - net	$ (3,835,211)	$ (3,963,798)
Regulatory assets for income taxes - net	(370,484)	0
Nuclear decommissioning trusts	(1,128,140)	(1,657,808)
Pension, net funding	(307,626)	(350,743)
Combined unitary state taxes	(9,440)	(24,645)
Power purchase agreements	(73,335)	(19,621)
Deferred Tax Liability, Deferred Fuel	(29,953)	0
Other	(248,997)	(249,327)
Total	(6,003,186)	(6,265,942)
Regulatory liabilities	895,756	841,370
Pension and other post-employment benefits	305,736	343,817
Sale and leaseback	121,473	122,397
Compensation	86,461	75,217
Accumulated deferred investment tax credit	57,643	59,285
Provision for allowances and contingencies	135,631	126,391
Deferred Tax Asset, Unbilled Revenue	43,762	0
Net operating loss carryforwards	628,165	467,255
Capital losses and miscellaneous tax credits	20,549	16,738
Valuation allowance	(243,726)	(137,283)
Other	125,522	54,058
Total	3,247,555	2,934,190
Non-current accrued taxes (including unrecognized tax benefits)	(1,296,928)	(956,547)
Deferred tax asset Nuclear Decommissioning Liabilities	1,070,583	964,945
Deferred Tax Liabilities, Net, Noncurrent	(4,052,559)	(4,288,299)
Entergy Arkansas [Member]
Plant basis differences - net	(966,791)	(1,289,827)
Regulatory assets for income taxes - net	(169,482)
Nuclear decommissioning trusts	(77,664)	(181,911)
Pension, net funding	(91,962)	(99,971)
Deferred fuel	(5,801)	(16,530)
Other	(41,025)	(23,079)
Total	(1,352,725)	(1,611,318)
Regulatory liabilities	247,964	227,489
Deferred tax Liability, Accrued Tax Expense, Compensation and Benefits Pensions	(19,068)	(16,252)
Sale and leaseback	0	0
Compensation	1,708	2,566
Accumulated deferred investment tax credit	8,599	8,913
Provision for allowances and contingencies	9,877	4,367
Deferred Tax Assets, Power Purchase Arrangements	(17,223)	0
Net operating loss carryforwards	6,338	16,172
Other	7,977	473
Total	353,122	385,065
Deferred Tax Assets, Net, Noncurrent		35,584
Accrued Income Taxes, Noncurrent	(85,942)
Deferred Tax Assets, Deferred Income	7,471	6,195
Deferred Tax Assets, Capital Losses and Miscellaneous Tax Credits		2,678
Deferred tax asset Nuclear Decommissioning Liabilities	99,479	132,464
Deferred Tax Liabilities, Net, Noncurrent	1,085,545	1,190,669
Entergy Louisiana [Member]
Plant basis differences - net	(1,893,831)	(1,583,100)
Regulatory assets for income taxes - net	(74,917)
Nuclear decommissioning trusts	(71,470)	(164,395)
Pension, net funding	(92,693)	(102,138)
Deferred fuel	(6,974)	(1,329)
Other	(34,700)	(98,307)
Total	(2,174,585)	(1,949,269)
Regulatory liabilities	339,126	368,156
Pension and other post-employment benefits	80,102	98,596
Sale and leaseback	18,999	19,915
Compensation	1,959	4,387
Accumulated deferred investment tax credit	33,928	35,323
Provision for allowances and contingencies	81,108	80,516
Deferred Tax Assets, Power Purchase Arrangements	19,385	(6,924)
Net operating loss carryforwards	20,118	44
Other	23,412	21,922
Total	649,530	662,563
Accrued Income Taxes, Noncurrent	(701,666)	(763,665)
Deferred Tax Liabilities, Deferred Expense	(17,345)	(18,263)
Deferred Tax Assets, Capital Losses and Miscellaneous Tax Credits		0
Deferred tax asset Nuclear Decommissioning Liabilities	48,738	58,891
Deferred Tax Liabilities, Net, Noncurrent	2,226,721	2,050,371
Entergy Mississippi [Member]
Plant basis differences - net	(579,319)	(571,682)
Regulatory assets for income taxes - net	(1,732)
Nuclear decommissioning trusts	0	0
Pension, net funding	(24,398)	(26,413)
Deferred fuel	(11,819)	(19,005)
Other	(13,443)	(11,306)
Total	(630,711)	(628,406)
Regulatory liabilities	72,570	102,676
Deferred tax Liability, Accrued Tax Expense, Compensation and Benefits Pensions	(5,405)	(4,865)
Sale and leaseback	0	0
Compensation	1,265	1,466
Accumulated deferred investment tax credit	2,541	2,212
Provision for allowances and contingencies	13,412	11,898
Deferred Tax Assets, Power Purchase Arrangements	1,140	1,129
Net operating loss carryforwards	4,896	10,255
Other	1,610	1,307
Total	97,556	136,661
Deferred Tax Assets, Net, Noncurrent		2,939
Accrued Income Taxes, Noncurrent	(18,714)
Deferred Tax Assets, Deferred Income	5,527	4,847
Deferred Tax Assets, Capital Losses and Miscellaneous Tax Credits		5,736
Deferred tax asset Nuclear Decommissioning Liabilities	0	0
Deferred Tax Liabilities, Net, Noncurrent	551,869	488,806
Entergy New Orleans [Member]
Plant basis differences - net	(135,143)	(85,515)
Regulatory assets for income taxes - net	(20,009)
Nuclear decommissioning trusts	0	0
Pension, net funding	(11,885)	(13,040)
Deferred fuel	(1,701)	(1,894)
Other	(7,640)	(23,610)
Total	(176,378)	(124,059)
Regulatory liabilities	40,181	23,526
Deferred tax Liability, Accrued Tax Expense, Compensation and Benefits Pensions	(11,371)	(9,618)
Sale and leaseback	0	0
Compensation	512	723
Accumulated deferred investment tax credit	579	488
Provision for allowances and contingencies	23,962	24,234
Deferred Tax Assets, Power Purchase Arrangements	12,155	0
Net operating loss carryforwards	480	0
Other	12,181	388
Total	79,315	41,552
Accrued Income Taxes, Noncurrent	(226,532)	(200,795)
Deferred Tax Assets, Deferred Income	636	1,811
Deferred Tax Assets, Capital Losses and Miscellaneous Tax Credits		0
Deferred tax asset Nuclear Decommissioning Liabilities	0	0
Deferred Tax Liabilities, Net, Noncurrent	323,595	283,302
Entergy Texas [Member]
Plant basis differences - net	(544,282)	(526,596)
Regulatory assets for income taxes - net	(57,777)
Nuclear decommissioning trusts	0	0
Pension, net funding	(20,331)	(20,700)
Deferred fuel	(2,835)	0
Other	(6,085)	(8,236)
Total	(631,310)	(555,532)
Regulatory liabilities	86,032	25,428
Deferred tax Liability, Accrued Tax Expense, Compensation and Benefits Pensions	(14,215)	(12,044)
Sale and leaseback		0
Compensation	995	1,224
Accumulated deferred investment tax credit	2,347	2,516
Provision for allowances and contingencies	5,579	4,383
Deferred Tax Assets, Power Purchase Arrangements	(18)	0
Net operating loss carryforwards	261	1,690
Other	2,127	1,133
Total	90,124	32,066
Accrued Income Taxes, Noncurrent	(11,349)	(21,176)
Deferred Tax Assets, Deferred Income	7,016	7,736
Deferred Tax Assets, Capital Losses and Miscellaneous Tax Credits		0
Deferred tax asset Nuclear Decommissioning Liabilities	0	0
Deferred Tax Liabilities, Net, Noncurrent	552,535	544,642
System Energy [Member]
Plant basis differences - net	(403,809)	(359,931)
Regulatory assets for income taxes - net	(46,627)
Nuclear decommissioning trusts	(86,882)	(119,184)
Pension, net funding	(18,898)	(21,871)
Deferred fuel	(312)	(272)
Other	(4,544)	(5,955)
Total	(561,072)	(507,213)
Regulatory liabilities	110,370	91,271
Deferred tax Liability, Accrued Tax Expense, Compensation and Benefits Pensions	(632)	(516)
Sale and leaseback	102,481	102,482
Compensation	(260)	332
Accumulated deferred investment tax credit	9,649	9,832
Provision for allowances and contingencies	0	0
Deferred Tax Assets, Power Purchase Arrangements	0	0
Net operating loss carryforwards	0	0
Other	4	0
Total	268,255	266,581
Accrued Income Taxes, Noncurrent	(512,479)	(535,788)
Deferred Tax Assets, Deferred Income	0	0
Deferred Tax Assets, Capital Losses and Miscellaneous Tax Credits		0
Deferred tax asset Nuclear Decommissioning Liabilities	46,643	63,180
Deferred Tax Liabilities, Net, Noncurrent	$ 805,296	$ 776,420