Retirement, Other Postretirement Benefits, And Defined Contribution Plans (Estimated Future Benefit Payments) (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	$ 330
Estimated Future Medicare Subsidy Receipts, Year Two	1,069
Estimated Future Medicare Subsidy Receipts, Year Three	1,204
Estimated Future Medicare Subsidy Receipts, Year Four	1,357
Estimated Future Medicare Subsidy Receipts, Year Five	1,518
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	10,336
Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	316,770
Estimated Future Benefits Payments, Year Two	328,101
Estimated Future Benefits Payments, Year Three	343,982
Estimated Future Benefits Payments, Year Four	362,642
Estimated Future Benefits Payments, Year Five	375,354
Estimated Future Benefits Payments, Year Six - Year Ten	2,128,911
Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	31,687
Estimated Future Benefits Payments, Year Two	12,251
Estimated Future Benefits Payments, Year Three	11,428
Estimated Future Benefits Payments, Year Four	13,183
Estimated Future Benefits Payments, Year Five	11,321
Estimated Future Benefits Payments, Year Six - Year Ten	79,373
Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	83,638
Estimated Future Benefits Payments, Year Two	88,235
Estimated Future Benefits Payments, Year Three	92,511
Estimated Future Benefits Payments, Year Four	95,167
Estimated Future Benefits Payments, Year Five	98,043
Estimated Future Benefits Payments, Year Six - Year Ten	510,419
Entergy Arkansas [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	73
Estimated Future Medicare Subsidy Receipts, Year Two	235
Estimated Future Medicare Subsidy Receipts, Year Three	265
Estimated Future Medicare Subsidy Receipts, Year Four	296
Estimated Future Medicare Subsidy Receipts, Year Five	325
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	2,119
Entergy Arkansas [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	76,603
Estimated Future Benefits Payments, Year Two	77,401
Estimated Future Benefits Payments, Year Three	78,484
Estimated Future Benefits Payments, Year Four	79,804
Estimated Future Benefits Payments, Year Five	81,382
Estimated Future Benefits Payments, Year Six - Year Ten	436,154
Entergy Arkansas [Member] | Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	242
Estimated Future Benefits Payments, Year Two	351
Estimated Future Benefits Payments, Year Three	282
Estimated Future Benefits Payments, Year Four	318
Estimated Future Benefits Payments, Year Five	282
Estimated Future Benefits Payments, Year Six - Year Ten	2,192
Entergy Arkansas [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	16,195
Estimated Future Benefits Payments, Year Two	16,505
Estimated Future Benefits Payments, Year Three	16,524
Estimated Future Benefits Payments, Year Four	16,410
Estimated Future Benefits Payments, Year Five	16,610
Estimated Future Benefits Payments, Year Six - Year Ten	82,670
Entergy Louisiana [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	75
Estimated Future Medicare Subsidy Receipts, Year Two	242
Estimated Future Medicare Subsidy Receipts, Year Three	268
Estimated Future Medicare Subsidy Receipts, Year Four	297
Estimated Future Medicare Subsidy Receipts, Year Five	330
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	2,193
Entergy Louisiana [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	73,648
Estimated Future Benefits Payments, Year Two	75,927
Estimated Future Benefits Payments, Year Three	78,351
Estimated Future Benefits Payments, Year Four	81,148
Estimated Future Benefits Payments, Year Five	84,705
Estimated Future Benefits Payments, Year Six - Year Ten	479,274
Entergy Louisiana [Member] | Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	233
Estimated Future Benefits Payments, Year Two	222
Estimated Future Benefits Payments, Year Three	211
Estimated Future Benefits Payments, Year Four	200
Estimated Future Benefits Payments, Year Five	189
Estimated Future Benefits Payments, Year Six - Year Ten	776
Entergy Louisiana [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	19,284
Estimated Future Benefits Payments, Year Two	19,986
Estimated Future Benefits Payments, Year Three	20,700
Estimated Future Benefits Payments, Year Four	21,218
Estimated Future Benefits Payments, Year Five	21,804
Estimated Future Benefits Payments, Year Six - Year Ten	114,287
Entergy Mississippi [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	26
Estimated Future Medicare Subsidy Receipts, Year Two	83
Estimated Future Medicare Subsidy Receipts, Year Three	91
Estimated Future Medicare Subsidy Receipts, Year Four	99
Estimated Future Medicare Subsidy Receipts, Year Five	107
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	666
Entergy Mississippi [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	21,416
Estimated Future Benefits Payments, Year Two	21,944
Estimated Future Benefits Payments, Year Three	22,423
Estimated Future Benefits Payments, Year Four	23,135
Estimated Future Benefits Payments, Year Five	23,801
Estimated Future Benefits Payments, Year Six - Year Ten	127,886
Entergy Mississippi [Member] | Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	137
Estimated Future Benefits Payments, Year Two	126
Estimated Future Benefits Payments, Year Three	124
Estimated Future Benefits Payments, Year Four	245
Estimated Future Benefits Payments, Year Five	167
Estimated Future Benefits Payments, Year Six - Year Ten	901
Entergy Mississippi [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	4,522
Estimated Future Benefits Payments, Year Two	4,772
Estimated Future Benefits Payments, Year Three	4,859
Estimated Future Benefits Payments, Year Four	5,032
Estimated Future Benefits Payments, Year Five	5,192
Estimated Future Benefits Payments, Year Six - Year Ten	26,500
Entergy New Orleans [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	18
Estimated Future Medicare Subsidy Receipts, Year Two	53
Estimated Future Medicare Subsidy Receipts, Year Three	56
Estimated Future Medicare Subsidy Receipts, Year Four	59
Estimated Future Medicare Subsidy Receipts, Year Five	61
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	353
Entergy New Orleans [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	8,829
Estimated Future Benefits Payments, Year Two	9,129
Estimated Future Benefits Payments, Year Three	9,467
Estimated Future Benefits Payments, Year Four	9,979
Estimated Future Benefits Payments, Year Five	10,577
Estimated Future Benefits Payments, Year Six - Year Ten	60,044
Entergy New Orleans [Member] | Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	20
Estimated Future Benefits Payments, Year Two	20
Estimated Future Benefits Payments, Year Three	51
Estimated Future Benefits Payments, Year Four	34
Estimated Future Benefits Payments, Year Five	36
Estimated Future Benefits Payments, Year Six - Year Ten	361
Entergy New Orleans [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	4,054
Estimated Future Benefits Payments, Year Two	4,086
Estimated Future Benefits Payments, Year Three	4,126
Estimated Future Benefits Payments, Year Four	4,084
Estimated Future Benefits Payments, Year Five	4,065
Estimated Future Benefits Payments, Year Six - Year Ten	19,532
Entergy Texas [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	30
Estimated Future Medicare Subsidy Receipts, Year Two	93
Estimated Future Medicare Subsidy Receipts, Year Three	100
Estimated Future Medicare Subsidy Receipts, Year Four	108
Estimated Future Medicare Subsidy Receipts, Year Five	115
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	723
Entergy Texas [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	20,614
Estimated Future Benefits Payments, Year Two	21,230
Estimated Future Benefits Payments, Year Three	21,753
Estimated Future Benefits Payments, Year Four	22,429
Estimated Future Benefits Payments, Year Five	23,048
Estimated Future Benefits Payments, Year Six - Year Ten	122,832
Entergy Texas [Member] | Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	773
Estimated Future Benefits Payments, Year Two	741
Estimated Future Benefits Payments, Year Three	716
Estimated Future Benefits Payments, Year Four	799
Estimated Future Benefits Payments, Year Five	690
Estimated Future Benefits Payments, Year Six - Year Ten	3,637
Entergy Texas [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	7,137
Estimated Future Benefits Payments, Year Two	7,576
Estimated Future Benefits Payments, Year Three	7,904
Estimated Future Benefits Payments, Year Four	8,155
Estimated Future Benefits Payments, Year Five	8,443
Estimated Future Benefits Payments, Year Six - Year Ten	42,855
System Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	10
Estimated Future Medicare Subsidy Receipts, Year Two	33
Estimated Future Medicare Subsidy Receipts, Year Three	40
Estimated Future Medicare Subsidy Receipts, Year Four	47
Estimated Future Medicare Subsidy Receipts, Year Five	54
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	424
System Energy [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	14,314
Estimated Future Benefits Payments, Year Two	14,681
Estimated Future Benefits Payments, Year Three	15,147
Estimated Future Benefits Payments, Year Four	15,747
Estimated Future Benefits Payments, Year Five	16,359
Estimated Future Benefits Payments, Year Six - Year Ten	98,295
System Energy [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	3,331
Estimated Future Benefits Payments, Year Two	3,392
Estimated Future Benefits Payments, Year Three	3,505
Estimated Future Benefits Payments, Year Four	3,555
Estimated Future Benefits Payments, Year Five	3,706
Estimated Future Benefits Payments, Year Six - Year Ten	$ 19,376