Retirement, Other Postretirement Benefits, And Defined Contribution Plans (Estimated Future Benefit Payments) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	$ 745
Estimated Future Medicare Subsidy Receipts, Year Two	842
Estimated Future Medicare Subsidy Receipts, Year Three	956
Estimated Future Medicare Subsidy Receipts, Year Four	1,071
Estimated Future Medicare Subsidy Receipts, Year Five	1,195
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	8,109
Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	412,057
Estimated Future Benefits Payments, Year Two	435,880
Estimated Future Benefits Payments, Year Three	447,224
Estimated Future Benefits Payments, Year Four	462,624
Estimated Future Benefits Payments, Year Five	470,846
Estimated Future Benefits Payments, Year Six - Year Ten	2,478,959
Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	26,375
Estimated Future Benefits Payments, Year Two	10,108
Estimated Future Benefits Payments, Year Three	13,364
Estimated Future Benefits Payments, Year Four	10,765
Estimated Future Benefits Payments, Year Five	17,425
Estimated Future Benefits Payments, Year Six - Year Ten	72,181
Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	82,087
Estimated Future Benefits Payments, Year Two	86,685
Estimated Future Benefits Payments, Year Three	89,508
Estimated Future Benefits Payments, Year Four	92,087
Estimated Future Benefits Payments, Year Five	94,427
Estimated Future Benefits Payments, Year Six - Year Ten	475,991
Entergy Arkansas [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	164
Estimated Future Medicare Subsidy Receipts, Year Two	185
Estimated Future Medicare Subsidy Receipts, Year Three	209
Estimated Future Medicare Subsidy Receipts, Year Four	230
Estimated Future Medicare Subsidy Receipts, Year Five	254
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	1,646
Entergy Arkansas [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	87,295
Estimated Future Benefits Payments, Year Two	87,832
Estimated Future Benefits Payments, Year Three	88,905
Estimated Future Benefits Payments, Year Four	90,278
Estimated Future Benefits Payments, Year Five	92,061
Estimated Future Benefits Payments, Year Six - Year Ten	479,160
Entergy Arkansas [Member] | Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	376
Estimated Future Benefits Payments, Year Two	300
Estimated Future Benefits Payments, Year Three	355
Estimated Future Benefits Payments, Year Four	310
Estimated Future Benefits Payments, Year Five	506
Estimated Future Benefits Payments, Year Six - Year Ten	2,196
Entergy Arkansas [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	15,282
Estimated Future Benefits Payments, Year Two	15,398
Estimated Future Benefits Payments, Year Three	15,349
Estimated Future Benefits Payments, Year Four	15,483
Estimated Future Benefits Payments, Year Five	15,419
Estimated Future Benefits Payments, Year Six - Year Ten	75,293
Entergy Louisiana [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	168
Estimated Future Medicare Subsidy Receipts, Year Two	187
Estimated Future Medicare Subsidy Receipts, Year Three	210
Estimated Future Medicare Subsidy Receipts, Year Four	234
Estimated Future Medicare Subsidy Receipts, Year Five	257
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	1,720
Entergy Louisiana [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	93,155
Estimated Future Benefits Payments, Year Two	96,060
Estimated Future Benefits Payments, Year Three	100,179
Estimated Future Benefits Payments, Year Four	103,810
Estimated Future Benefits Payments, Year Five	107,609
Estimated Future Benefits Payments, Year Six - Year Ten	571,926
Entergy Louisiana [Member] | Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	231
Estimated Future Benefits Payments, Year Two	219
Estimated Future Benefits Payments, Year Three	208
Estimated Future Benefits Payments, Year Four	196
Estimated Future Benefits Payments, Year Five	186
Estimated Future Benefits Payments, Year Six - Year Ten	749
Entergy Louisiana [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	18,962
Estimated Future Benefits Payments, Year Two	19,767
Estimated Future Benefits Payments, Year Three	20,287
Estimated Future Benefits Payments, Year Four	20,756
Estimated Future Benefits Payments, Year Five	21,250
Estimated Future Benefits Payments, Year Six - Year Ten	108,290
Entergy Mississippi [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	58
Estimated Future Medicare Subsidy Receipts, Year Two	65
Estimated Future Medicare Subsidy Receipts, Year Three	70
Estimated Future Medicare Subsidy Receipts, Year Four	76
Estimated Future Medicare Subsidy Receipts, Year Five	82
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	514
Entergy Mississippi [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	25,833
Estimated Future Benefits Payments, Year Two	25,977
Estimated Future Benefits Payments, Year Three	27,198
Estimated Future Benefits Payments, Year Four	27,508
Estimated Future Benefits Payments, Year Five	27,389
Estimated Future Benefits Payments, Year Six - Year Ten	141,912
Entergy Mississippi [Member] | Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	135
Estimated Future Benefits Payments, Year Two	137
Estimated Future Benefits Payments, Year Three	290
Estimated Future Benefits Payments, Year Four	192
Estimated Future Benefits Payments, Year Five	201
Estimated Future Benefits Payments, Year Six - Year Ten	1,462
Entergy Mississippi [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	4,677
Estimated Future Benefits Payments, Year Two	4,818
Estimated Future Benefits Payments, Year Three	5,043
Estimated Future Benefits Payments, Year Four	5,218
Estimated Future Benefits Payments, Year Five	5,331
Estimated Future Benefits Payments, Year Six - Year Ten	26,723
Entergy New Orleans [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	38
Estimated Future Medicare Subsidy Receipts, Year Two	39
Estimated Future Medicare Subsidy Receipts, Year Three	41
Estimated Future Medicare Subsidy Receipts, Year Four	43
Estimated Future Medicare Subsidy Receipts, Year Five	46
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	259
Entergy New Orleans [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	11,484
Estimated Future Benefits Payments, Year Two	12,202
Estimated Future Benefits Payments, Year Three	12,463
Estimated Future Benefits Payments, Year Four	13,087
Estimated Future Benefits Payments, Year Five	13,207
Estimated Future Benefits Payments, Year Six - Year Ten	69,595
Entergy New Orleans [Member] | Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	21
Estimated Future Benefits Payments, Year Two	55
Estimated Future Benefits Payments, Year Three	36
Estimated Future Benefits Payments, Year Four	39
Estimated Future Benefits Payments, Year Five	41
Estimated Future Benefits Payments, Year Six - Year Ten	459
Entergy New Orleans [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	3,954
Estimated Future Benefits Payments, Year Two	4,000
Estimated Future Benefits Payments, Year Three	3,952
Estimated Future Benefits Payments, Year Four	3,899
Estimated Future Benefits Payments, Year Five	3,800
Estimated Future Benefits Payments, Year Six - Year Ten	17,698
Entergy Texas [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	64
Estimated Future Medicare Subsidy Receipts, Year Two	69
Estimated Future Medicare Subsidy Receipts, Year Three	75
Estimated Future Medicare Subsidy Receipts, Year Four	81
Estimated Future Medicare Subsidy Receipts, Year Five	88
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	552
Entergy Texas [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	25,333
Estimated Future Benefits Payments, Year Two	25,656
Estimated Future Benefits Payments, Year Three	26,399
Estimated Future Benefits Payments, Year Four	26,756
Estimated Future Benefits Payments, Year Five	26,310
Estimated Future Benefits Payments, Year Six - Year Ten	130,905
Entergy Texas [Member] | Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	788
Estimated Future Benefits Payments, Year Two	764
Estimated Future Benefits Payments, Year Three	895
Estimated Future Benefits Payments, Year Four	723
Estimated Future Benefits Payments, Year Five	662
Estimated Future Benefits Payments, Year Six - Year Ten	3,762
Entergy Texas [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	6,485
Estimated Future Benefits Payments, Year Two	6,842
Estimated Future Benefits Payments, Year Three	7,101
Estimated Future Benefits Payments, Year Four	7,369
Estimated Future Benefits Payments, Year Five	7,519
Estimated Future Benefits Payments, Year Six - Year Ten	36,897
System Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	23
Estimated Future Medicare Subsidy Receipts, Year Two	27
Estimated Future Medicare Subsidy Receipts, Year Three	33
Estimated Future Medicare Subsidy Receipts, Year Four	38
Estimated Future Medicare Subsidy Receipts, Year Five	46
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	346
System Energy [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	17,780
Estimated Future Benefits Payments, Year Two	18,566
Estimated Future Benefits Payments, Year Three	19,398
Estimated Future Benefits Payments, Year Four	20,279
Estimated Future Benefits Payments, Year Five	21,714
Estimated Future Benefits Payments, Year Six - Year Ten	117,835
System Energy [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	3,246
Estimated Future Benefits Payments, Year Two	3,363
Estimated Future Benefits Payments, Year Three	3,381
Estimated Future Benefits Payments, Year Four	3,537
Estimated Future Benefits Payments, Year Five	3,595
Estimated Future Benefits Payments, Year Six - Year Ten	$ 17,677