Retirement, Other Postretirement Benefits, And Defined Contribution Plans (Estimated Future Benefit Payments) (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	$ 359
Estimated Future Medicare Subsidy Receipts, Year Two	398
Estimated Future Medicare Subsidy Receipts, Year Three	446
Estimated Future Medicare Subsidy Receipts, Year Four	491
Estimated Future Medicare Subsidy Receipts, Year Five	539
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	3,402
Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	548,493
Estimated Future Benefits Payments, Year Two	543,704
Estimated Future Benefits Payments, Year Three	549,488
Estimated Future Benefits Payments, Year Four	550,184
Estimated Future Benefits Payments, Year Five	554,602
Estimated Future Benefits Payments, Year Six - Year Ten	2,604,810
Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	18,144
Estimated Future Benefits Payments, Year Two	15,724
Estimated Future Benefits Payments, Year Three	20,421
Estimated Future Benefits Payments, Year Four	19,720
Estimated Future Benefits Payments, Year Five	15,142
Estimated Future Benefits Payments, Year Six - Year Ten	65,010
Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	81,100
Estimated Future Benefits Payments, Year Two	82,207
Estimated Future Benefits Payments, Year Three	82,619
Estimated Future Benefits Payments, Year Four	82,044
Estimated Future Benefits Payments, Year Five	80,649
Estimated Future Benefits Payments, Year Six - Year Ten	373,404
Entergy Arkansas [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	78
Estimated Future Medicare Subsidy Receipts, Year Two	86
Estimated Future Medicare Subsidy Receipts, Year Three	95
Estimated Future Medicare Subsidy Receipts, Year Four	104
Estimated Future Medicare Subsidy Receipts, Year Five	111
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	685
Entergy Arkansas [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	117,460
Estimated Future Benefits Payments, Year Two	112,562
Estimated Future Benefits Payments, Year Three	112,749
Estimated Future Benefits Payments, Year Four	110,326
Estimated Future Benefits Payments, Year Five	108,186
Estimated Future Benefits Payments, Year Six - Year Ten	512,732
Entergy Arkansas [Member] | Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	249
Estimated Future Benefits Payments, Year Two	278
Estimated Future Benefits Payments, Year Three	340
Estimated Future Benefits Payments, Year Four	269
Estimated Future Benefits Payments, Year Five	235
Estimated Future Benefits Payments, Year Six - Year Ten	1,152
Entergy Arkansas [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	13,088
Estimated Future Benefits Payments, Year Two	13,074
Estimated Future Benefits Payments, Year Three	12,801
Estimated Future Benefits Payments, Year Four	12,450
Estimated Future Benefits Payments, Year Five	12,155
Estimated Future Benefits Payments, Year Six - Year Ten	55,553
Entergy Louisiana [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	78
Estimated Future Medicare Subsidy Receipts, Year Two	87
Estimated Future Medicare Subsidy Receipts, Year Three	95
Estimated Future Medicare Subsidy Receipts, Year Four	104
Estimated Future Medicare Subsidy Receipts, Year Five	114
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	719
Entergy Louisiana [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	123,520
Estimated Future Benefits Payments, Year Two	124,235
Estimated Future Benefits Payments, Year Three	124,692
Estimated Future Benefits Payments, Year Four	123,347
Estimated Future Benefits Payments, Year Five	122,228
Estimated Future Benefits Payments, Year Six - Year Ten	574,928
Entergy Louisiana [Member] | Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	216
Estimated Future Benefits Payments, Year Two	200
Estimated Future Benefits Payments, Year Three	184
Estimated Future Benefits Payments, Year Four	168
Estimated Future Benefits Payments, Year Five	154
Estimated Future Benefits Payments, Year Six - Year Ten	574
Entergy Louisiana [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	18,545
Estimated Future Benefits Payments, Year Two	18,703
Estimated Future Benefits Payments, Year Three	18,754
Estimated Future Benefits Payments, Year Four	18,588
Estimated Future Benefits Payments, Year Five	18,087
Estimated Future Benefits Payments, Year Six - Year Ten	84,395
Entergy Mississippi [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	27
Estimated Future Medicare Subsidy Receipts, Year Two	28
Estimated Future Medicare Subsidy Receipts, Year Three	31
Estimated Future Medicare Subsidy Receipts, Year Four	32
Estimated Future Medicare Subsidy Receipts, Year Five	35
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	205
Entergy Mississippi [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	37,805
Estimated Future Benefits Payments, Year Two	36,552
Estimated Future Benefits Payments, Year Three	35,779
Estimated Future Benefits Payments, Year Four	34,984
Estimated Future Benefits Payments, Year Five	33,842
Estimated Future Benefits Payments, Year Six - Year Ten	152,681
Entergy Mississippi [Member] | Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	357
Estimated Future Benefits Payments, Year Two	335
Estimated Future Benefits Payments, Year Three	329
Estimated Future Benefits Payments, Year Four	301
Estimated Future Benefits Payments, Year Five	356
Estimated Future Benefits Payments, Year Six - Year Ten	1,510
Entergy Mississippi [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	4,046
Estimated Future Benefits Payments, Year Two	4,205
Estimated Future Benefits Payments, Year Three	4,261
Estimated Future Benefits Payments, Year Four	4,249
Estimated Future Benefits Payments, Year Five	4,250
Estimated Future Benefits Payments, Year Six - Year Ten	20,672
Entergy New Orleans [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	15
Estimated Future Medicare Subsidy Receipts, Year Two	15
Estimated Future Medicare Subsidy Receipts, Year Three	17
Estimated Future Medicare Subsidy Receipts, Year Four	17
Estimated Future Medicare Subsidy Receipts, Year Five	17
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	94
Entergy New Orleans [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	14,865
Estimated Future Benefits Payments, Year Two	14,598
Estimated Future Benefits Payments, Year Three	14,628
Estimated Future Benefits Payments, Year Four	14,472
Estimated Future Benefits Payments, Year Five	14,028
Estimated Future Benefits Payments, Year Six - Year Ten	64,517
Entergy New Orleans [Member] | Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	17
Estimated Future Benefits Payments, Year Two	17
Estimated Future Benefits Payments, Year Three	17
Estimated Future Benefits Payments, Year Four	21
Estimated Future Benefits Payments, Year Five	19
Estimated Future Benefits Payments, Year Six - Year Ten	102
Entergy New Orleans [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	3,384
Estimated Future Benefits Payments, Year Two	3,255
Estimated Future Benefits Payments, Year Three	3,112
Estimated Future Benefits Payments, Year Four	2,997
Estimated Future Benefits Payments, Year Five	2,864
Estimated Future Benefits Payments, Year Six - Year Ten	12,151
Entergy Texas [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	28
Estimated Future Medicare Subsidy Receipts, Year Two	31
Estimated Future Medicare Subsidy Receipts, Year Three	32
Estimated Future Medicare Subsidy Receipts, Year Four	35
Estimated Future Medicare Subsidy Receipts, Year Five	38
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	222
Entergy Texas [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	33,558
Estimated Future Benefits Payments, Year Two	32,552
Estimated Future Benefits Payments, Year Three	32,041
Estimated Future Benefits Payments, Year Four	30,992
Estimated Future Benefits Payments, Year Five	29,124
Estimated Future Benefits Payments, Year Six - Year Ten	127,736
Entergy Texas [Member] | Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	723
Estimated Future Benefits Payments, Year Two	817
Estimated Future Benefits Payments, Year Three	756
Estimated Future Benefits Payments, Year Four	844
Estimated Future Benefits Payments, Year Five	721
Estimated Future Benefits Payments, Year Six - Year Ten	2,970
Entergy Texas [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	6,292
Estimated Future Benefits Payments, Year Two	6,468
Estimated Future Benefits Payments, Year Three	6,520
Estimated Future Benefits Payments, Year Four	6,446
Estimated Future Benefits Payments, Year Five	6,239
Estimated Future Benefits Payments, Year Six - Year Ten	29,004
System Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	13
Estimated Future Medicare Subsidy Receipts, Year Two	14
Estimated Future Medicare Subsidy Receipts, Year Three	16
Estimated Future Medicare Subsidy Receipts, Year Four	19
Estimated Future Medicare Subsidy Receipts, Year Five	22
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	152
System Energy [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	26,332
Estimated Future Benefits Payments, Year Two	26,529
Estimated Future Benefits Payments, Year Three	26,996
Estimated Future Benefits Payments, Year Four	27,040
Estimated Future Benefits Payments, Year Five	26,696
Estimated Future Benefits Payments, Year Six - Year Ten	127,243
System Energy [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	2,932
Estimated Future Benefits Payments, Year Two	3,044
Estimated Future Benefits Payments, Year Three	3,055
Estimated Future Benefits Payments, Year Four	2,990
Estimated Future Benefits Payments, Year Five	2,893
Estimated Future Benefits Payments, Year Six - Year Ten	$ 13,110