Retirement, Other Postretirement Benefits, And Defined Contribution Plans Estimated Future Benefit Payments (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	$ 123
Estimated Future Medicare Subsidy Receipts, Year Two	82
Estimated Future Medicare Subsidy Receipts, Year Three	93
Estimated Future Medicare Subsidy Receipts, Year Four	101
Estimated Future Medicare Subsidy Receipts, Year Five	112
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	703
Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	566,242
Estimated Future Benefits Payments, Year Two	568,058
Estimated Future Benefits Payments, Year Three	569,348
Estimated Future Benefits Payments, Year Four	576,365
Estimated Future Benefits Payments, Year Five	552,303
Estimated Future Benefits Payments, Year Six - Year Ten	2,641,864
Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	22,851
Estimated Future Benefits Payments, Year Two	24,193
Estimated Future Benefits Payments, Year Three	23,906
Estimated Future Benefits Payments, Year Four	17,183
Estimated Future Benefits Payments, Year Five	25,477
Estimated Future Benefits Payments, Year Six - Year Ten	56,584
Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	68,109
Estimated Future Benefits Payments, Year Two	67,904
Estimated Future Benefits Payments, Year Three	68,149
Estimated Future Benefits Payments, Year Four	67,569
Estimated Future Benefits Payments, Year Five	66,414
Estimated Future Benefits Payments, Year Six - Year Ten	314,972
Entergy Arkansas [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	40
Estimated Future Medicare Subsidy Receipts, Year Two	39
Estimated Future Medicare Subsidy Receipts, Year Three	42
Estimated Future Medicare Subsidy Receipts, Year Four	45
Estimated Future Medicare Subsidy Receipts, Year Five	49
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	289
Entergy Arkansas [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	115,340
Estimated Future Benefits Payments, Year Two	114,260
Estimated Future Benefits Payments, Year Three	111,759
Estimated Future Benefits Payments, Year Four	110,128
Estimated Future Benefits Payments, Year Five	108,314
Estimated Future Benefits Payments, Year Six - Year Ten	513,207
Entergy Arkansas [Member] | Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	218
Estimated Future Benefits Payments, Year Two	424
Estimated Future Benefits Payments, Year Three	328
Estimated Future Benefits Payments, Year Four	285
Estimated Future Benefits Payments, Year Five	580
Estimated Future Benefits Payments, Year Six - Year Ten	976
Entergy Arkansas [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	12,693
Estimated Future Benefits Payments, Year Two	12,542
Estimated Future Benefits Payments, Year Three	12,329
Estimated Future Benefits Payments, Year Four	12,156
Estimated Future Benefits Payments, Year Five	11,869
Estimated Future Benefits Payments, Year Six - Year Ten	56,603
Entergy Louisiana [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	20
Estimated Future Medicare Subsidy Receipts, Year Two	6
Estimated Future Medicare Subsidy Receipts, Year Three	6
Estimated Future Medicare Subsidy Receipts, Year Four	8
Estimated Future Medicare Subsidy Receipts, Year Five	8
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	58
Entergy Louisiana [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	130,058
Estimated Future Benefits Payments, Year Two	130,019
Estimated Future Benefits Payments, Year Three	128,199
Estimated Future Benefits Payments, Year Four	126,927
Estimated Future Benefits Payments, Year Five	124,911
Estimated Future Benefits Payments, Year Six - Year Ten	575,141
Entergy Louisiana [Member] | Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	193
Estimated Future Benefits Payments, Year Two	211
Estimated Future Benefits Payments, Year Three	217
Estimated Future Benefits Payments, Year Four	196
Estimated Future Benefits Payments, Year Five	209
Estimated Future Benefits Payments, Year Six - Year Ten	718
Entergy Louisiana [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	15,600
Estimated Future Benefits Payments, Year Two	15,502
Estimated Future Benefits Payments, Year Three	15,397
Estimated Future Benefits Payments, Year Four	15,034
Estimated Future Benefits Payments, Year Five	14,825
Estimated Future Benefits Payments, Year Six - Year Ten	69,424
Entergy Mississippi [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	19
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	112
Entergy Mississippi [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	38,131
Estimated Future Benefits Payments, Year Two	38,104
Estimated Future Benefits Payments, Year Three	37,159
Estimated Future Benefits Payments, Year Four	35,571
Estimated Future Benefits Payments, Year Five	34,377
Estimated Future Benefits Payments, Year Six - Year Ten	155,722
Entergy Mississippi [Member] | Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	181
Estimated Future Benefits Payments, Year Two	411
Estimated Future Benefits Payments, Year Three	377
Estimated Future Benefits Payments, Year Four	454
Estimated Future Benefits Payments, Year Five	439
Estimated Future Benefits Payments, Year Six - Year Ten	2,146
Entergy Mississippi [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	3,386
Estimated Future Benefits Payments, Year Two	3,498
Estimated Future Benefits Payments, Year Three	3,541
Estimated Future Benefits Payments, Year Four	3,574
Estimated Future Benefits Payments, Year Five	3,614
Estimated Future Benefits Payments, Year Six - Year Ten	17,668
Entergy New Orleans [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	0
Estimated Future Medicare Subsidy Receipts, Year Two	0
Estimated Future Medicare Subsidy Receipts, Year Three	0
Estimated Future Medicare Subsidy Receipts, Year Four	0
Estimated Future Medicare Subsidy Receipts, Year Five	0
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	0
Entergy New Orleans [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	15,011
Estimated Future Benefits Payments, Year Two	15,202
Estimated Future Benefits Payments, Year Three	15,030
Estimated Future Benefits Payments, Year Four	14,437
Estimated Future Benefits Payments, Year Five	14,052
Estimated Future Benefits Payments, Year Six - Year Ten	63,426
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	21
Estimated Future Benefits Payments, Year Four	19
Estimated Future Benefits Payments, Year Five	19
Estimated Future Benefits Payments, Year Six - Year Ten	111
Entergy New Orleans [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	2,412
Estimated Future Benefits Payments, Year Two	2,322
Estimated Future Benefits Payments, Year Three	2,238
Estimated Future Benefits Payments, Year Four	2,151
Estimated Future Benefits Payments, Year Five	2,070
Estimated Future Benefits Payments, Year Six - Year Ten	8,853
Entergy Texas [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	13
Estimated Future Medicare Subsidy Receipts, Year Two	4
Estimated Future Medicare Subsidy Receipts, Year Three	5
Estimated Future Medicare Subsidy Receipts, Year Four	5
Estimated Future Medicare Subsidy Receipts, Year Five	6
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	43
Entergy Texas [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	32,935
Estimated Future Benefits Payments, Year Two	32,859
Estimated Future Benefits Payments, Year Three	31,439
Estimated Future Benefits Payments, Year Four	29,541
Estimated Future Benefits Payments, Year Five	27,781
Estimated Future Benefits Payments, Year Six - Year Ten	123,688
Entergy Texas [Member] | Non-Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	633
Estimated Future Benefits Payments, Year Two	871
Estimated Future Benefits Payments, Year Three	1,004
Estimated Future Benefits Payments, Year Four	851
Estimated Future Benefits Payments, Year Five	762
Estimated Future Benefits Payments, Year Six - Year Ten	3,250
Entergy Texas [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	5,322
Estimated Future Benefits Payments, Year Two	4,840
Estimated Future Benefits Payments, Year Three	4,770
Estimated Future Benefits Payments, Year Four	4,597
Estimated Future Benefits Payments, Year Five	4,486
Estimated Future Benefits Payments, Year Six - Year Ten	20,622
System Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Medicare Subsidy Receipts, Year One	5
Estimated Future Medicare Subsidy Receipts, Year Two	1
Estimated Future Medicare Subsidy Receipts, Year Three	2
Estimated Future Medicare Subsidy Receipts, Year Four	2
Estimated Future Medicare Subsidy Receipts, Year Five	1
Estimated Future Medicare Subsidy Receipts, Year Six - Year Ten	12
System Energy [Member] | Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	29,202
Estimated Future Benefits Payments, Year Two	28,854
Estimated Future Benefits Payments, Year Three	28,833
Estimated Future Benefits Payments, Year Four	28,641
Estimated Future Benefits Payments, Year Five	27,378
Estimated Future Benefits Payments, Year Six - Year Ten	132,163
System Energy [Member] | Other Postretirement Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Benefits Payments, Year One	2,739
Estimated Future Benefits Payments, Year Two	2,734
Estimated Future Benefits Payments, Year Three	2,676
Estimated Future Benefits Payments, Year Four	2,579
Estimated Future Benefits Payments, Year Five	2,518
Estimated Future Benefits Payments, Year Six - Year Ten	$ 11,749