Retirement, Other Postretirement Benefits, And Defined Contribution Plans (Estimated Future Benefit Payments) (Details) $ in Thousands	Dec. 31, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	$ 381
Estimated Future Medicare Subsidy Receipts, Year Two	432
Estimated Future Medicare Subsidy Receipts, Year Three	1,387
Estimated Future Medicare Subsidy Receipts, Year Four	1,545
Estimated Future Medicare Subsidy Receipts, Year Five	1,733
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	11,672
Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	287,575
Estimated Future Benefits Payments, Year Two	301,880
Estimated Future Benefits Payments, Year Three	317,395
Estimated Future Benefits Payments, Year Four	334,308
Estimated Future Benefits Payments, Year Five	351,112
Estimated Future Benefits Payments, Year Six - Year Ten	2,039,411
Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	21,187
Estimated Future Benefits Payments, Year Two	10,985
Estimated Future Benefits Payments, Year Three	11,456
Estimated Future Benefits Payments, Year Four	10,794
Estimated Future Benefits Payments, Year Five	13,443
Estimated Future Benefits Payments, Year Six - Year Ten	80,652
Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	78,016
Estimated Future Benefits Payments, Year Two	80,565
Estimated Future Benefits Payments, Year Three	85,034
Estimated Future Benefits Payments, Year Four	88,803
Estimated Future Benefits Payments, Year Five	91,540
Estimated Future Benefits Payments, Year Six - Year Ten	487,584
Entergy Arkansas [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	86
Estimated Future Medicare Subsidy Receipts, Year Two	96
Estimated Future Medicare Subsidy Receipts, Year Three	305
Estimated Future Medicare Subsidy Receipts, Year Four	339
Estimated Future Medicare Subsidy Receipts, Year Five	377
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	2,422
Entergy Arkansas [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	71,847
Estimated Future Benefits Payments, Year Two	72,566
Estimated Future Benefits Payments, Year Three	73,854
Estimated Future Benefits Payments, Year Four	75,442
Estimated Future Benefits Payments, Year Five	77,137
Estimated Future Benefits Payments, Year Six - Year Ten	423,691
Entergy Arkansas [Member] | Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	2,128
Estimated Future Benefits Payments, Year Two	223
Estimated Future Benefits Payments, Year Three	217
Estimated Future Benefits Payments, Year Four	211
Estimated Future Benefits Payments, Year Five	265
Estimated Future Benefits Payments, Year Six - Year Ten	1,579
Entergy Arkansas [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	16,001
Estimated Future Benefits Payments, Year Two	15,925
Estimated Future Benefits Payments, Year Three	16,249
Estimated Future Benefits Payments, Year Four	16,292
Estimated Future Benefits Payments, Year Five	16,221
Estimated Future Benefits Payments, Year Six - Year Ten	82,430
Entergy Louisiana [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	89
Estimated Future Medicare Subsidy Receipts, Year Two	99
Estimated Future Medicare Subsidy Receipts, Year Three	313
Estimated Future Medicare Subsidy Receipts, Year Four	344
Estimated Future Medicare Subsidy Receipts, Year Five	380
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	2,487
Entergy Louisiana [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	68,238
Estimated Future Benefits Payments, Year Two	70,537
Estimated Future Benefits Payments, Year Three	73,422
Estimated Future Benefits Payments, Year Four	76,224
Estimated Future Benefits Payments, Year Five	79,554
Estimated Future Benefits Payments, Year Six - Year Ten	460,606
Entergy Louisiana [Member] | Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	237
Estimated Future Benefits Payments, Year Two	230
Estimated Future Benefits Payments, Year Three	222
Estimated Future Benefits Payments, Year Four	214
Estimated Future Benefits Payments, Year Five	206
Estimated Future Benefits Payments, Year Six - Year Ten	961
Entergy Louisiana [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	18,946
Estimated Future Benefits Payments, Year Two	19,244
Estimated Future Benefits Payments, Year Three	20,046
Estimated Future Benefits Payments, Year Four	20,863
Estimated Future Benefits Payments, Year Five	21,501
Estimated Future Benefits Payments, Year Six - Year Ten	115,765
Entergy Mississippi [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	31
Estimated Future Medicare Subsidy Receipts, Year Two	34
Estimated Future Medicare Subsidy Receipts, Year Three	107
Estimated Future Medicare Subsidy Receipts, Year Four	117
Estimated Future Medicare Subsidy Receipts, Year Five	125
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	774
Entergy Mississippi [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	20,061
Estimated Future Benefits Payments, Year Two	20,805
Estimated Future Benefits Payments, Year Three	21,544
Estimated Future Benefits Payments, Year Four	22,237
Estimated Future Benefits Payments, Year Five	23,168
Estimated Future Benefits Payments, Year Six - Year Ten	127,084
Entergy Mississippi [Member] | Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	119
Estimated Future Benefits Payments, Year Two	130
Estimated Future Benefits Payments, Year Three	119
Estimated Future Benefits Payments, Year Four	117
Estimated Future Benefits Payments, Year Five	229
Estimated Future Benefits Payments, Year Six - Year Ten	863
Entergy Mississippi [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	4,106
Estimated Future Benefits Payments, Year Two	4,168
Estimated Future Benefits Payments, Year Three	4,402
Estimated Future Benefits Payments, Year Four	4,509
Estimated Future Benefits Payments, Year Five	4,677
Estimated Future Benefits Payments, Year Six - Year Ten	25,004
Entergy New Orleans [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	22
Estimated Future Medicare Subsidy Receipts, Year Two	23
Estimated Future Medicare Subsidy Receipts, Year Three	70
Estimated Future Medicare Subsidy Receipts, Year Four	73
Estimated Future Medicare Subsidy Receipts, Year Five	77
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	430
Entergy New Orleans [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	8,094
Estimated Future Benefits Payments, Year Two	8,426
Estimated Future Benefits Payments, Year Three	8,902
Estimated Future Benefits Payments, Year Four	9,321
Estimated Future Benefits Payments, Year Five	9,910
Estimated Future Benefits Payments, Year Six - Year Ten	58,280
Entergy New Orleans [Member] | Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	19
Estimated Future Benefits Payments, Year Two	19
Estimated Future Benefits Payments, Year Three	19
Estimated Future Benefits Payments, Year Four	46
Estimated Future Benefits Payments, Year Five	31
Estimated Future Benefits Payments, Year Six - Year Ten	218
Entergy New Orleans [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	3,763
Estimated Future Benefits Payments, Year Two	3,755
Estimated Future Benefits Payments, Year Three	3,803
Estimated Future Benefits Payments, Year Four	3,820
Estimated Future Benefits Payments, Year Five	3,785
Estimated Future Benefits Payments, Year Six - Year Ten	18,266
Entergy Texas [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	36
Estimated Future Medicare Subsidy Receipts, Year Two	39
Estimated Future Medicare Subsidy Receipts, Year Three	120
Estimated Future Medicare Subsidy Receipts, Year Four	128
Estimated Future Medicare Subsidy Receipts, Year Five	137
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	832
Entergy Texas [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	19,442
Estimated Future Benefits Payments, Year Two	20,185
Estimated Future Benefits Payments, Year Three	20,955
Estimated Future Benefits Payments, Year Four	21,604
Estimated Future Benefits Payments, Year Five	22,438
Estimated Future Benefits Payments, Year Six - Year Ten	123,521
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	731
Estimated Future Benefits Payments, Year Three	702
Estimated Future Benefits Payments, Year Four	680
Estimated Future Benefits Payments, Year Five	751
Estimated Future Benefits Payments, Year Six - Year Ten	3,255
Entergy Texas [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	6,244
Estimated Future Benefits Payments, Year Two	6,448
Estimated Future Benefits Payments, Year Three	6,864
Estimated Future Benefits Payments, Year Four	7,177
Estimated Future Benefits Payments, Year Five	7,389
Estimated Future Benefits Payments, Year Six - Year Ten	38,692
System Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	11
Estimated Future Medicare Subsidy Receipts, Year Two	13
Estimated Future Medicare Subsidy Receipts, Year Three	44
Estimated Future Medicare Subsidy Receipts, Year Four	51
Estimated Future Medicare Subsidy Receipts, Year Five	60
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	465
System Energy [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	13,043
Estimated Future Benefits Payments, Year Two	13,320
Estimated Future Benefits Payments, Year Three	13,791
Estimated Future Benefits Payments, Year Four	14,153
Estimated Future Benefits Payments, Year Five	14,950
Estimated Future Benefits Payments, Year Six - Year Ten	89,766
System Energy [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	3,051
Estimated Future Benefits Payments, Year Two	3,115
Estimated Future Benefits Payments, Year Three	3,183
Estimated Future Benefits Payments, Year Four	3,290
Estimated Future Benefits Payments, Year Five	3,349
Estimated Future Benefits Payments, Year Six - Year Ten	$ 18,094