Income Taxes (Significant Components Of Accumulated Deferred Income Taxes And Taxes Accrued) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Plant basis differences - net	$ (6,136,563)	$ (4,795,422)
Regulatory assets for income taxes - net	(930,244)	(429,996)
Nuclear decommissioning trusts	(656,185)	(1,188,235)
Pension, net funding	(322,788)	(327,445)
Combined unitary state taxes	(7,255)	(7,723)
Deferred Tax Liability, Deferred Fuel	(85,310)	(7,667)
Other	(341,450)	(549,355)
Total	(8,687,038)	(7,314,995)
Regulatory liabilities	1,318,381	791,927
Pension and other post-employment benefits	208,128	278,486
Sale and leaseback	102,474	102,477
Compensation	79,798	89,279
Accumulated deferred investment tax credit	57,986	57,379
Provision for allowances and contingencies	82,286	71,598
Deferred Tax Assets, Power Purchase Arrangements	55,259	352,019
Net operating loss carryforwards	2,868,424	1,580,109
Capital losses and miscellaneous tax credits	11,111	21,291
Valuation allowance	(325,239)	(328,581)
Other	200,032	230,291
Deferred Tax Assets, Net of Valuation Allowance	4,963,459	4,214,739
Non-current accrued taxes (including unrecognized tax benefits)	(929,032)	(1,185,227)
Deferred Tax Liabilities, Deferred Expense	0	(9,152)
Deferred Tax Liabilities, Accumulated Storm Damage Provision	207,243	0
Deferred tax asset Nuclear Decommissioning Liabilities	278,136	968,464
Deferred Tax Liabilities, Net, Noncurrent	(4,652,611)	(4,285,483)
Deferred Tax Asset, Unbilled Revenue	26,683	0
Entergy Arkansas [Member]
Plant basis differences - net	(1,158,523)	(1,117,948)
Regulatory assets for income taxes - net	(226,687)	(188,284)
Nuclear decommissioning trusts	(175,882)	(156,123)
Pension, net funding	(92,881)	(93,486)
Deferred fuel	(27,497)	0
Other	(77,820)	(54,753)
Total	(1,759,290)	(1,610,594)
Regulatory liabilities	310,256	273,774
Deferred tax Liability, Accrued Tax Expense, Compensation and Benefits Pensions	(26,577)	(24,747)
Sale and leaseback	0	0
Compensation	3,347	2,264
Accumulated deferred investment tax credit	7,518	7,971
Provision for allowances and contingencies	24,829	22,179
Deferred Tax Assets, Power Purchase Arrangements	0	9,662
Net operating loss carryforwards	275,054	119,555
Other	19,397	16,036
Deferred Tax Assets, Net of Valuation Allowance	740,723	554,255
Accrued Income Taxes, Noncurrent	397,634	229,784
Deferred Tax Assets, Deferred Income	3,331	4,242
Deferred Tax Liabilities, Accumulated Storm Damage Provision	0
Deferred Tax Assets, Capital Losses and Miscellaneous Tax Credits	0	0
Deferred tax asset Nuclear Decommissioning Liabilities	123,568	123,319
Deferred Tax Liabilities, Net, Noncurrent	(1,416,201)	(1,286,123)
Entergy Louisiana [Member]
Plant basis differences - net	(3,429,473)	(2,481,976)
Regulatory assets for income taxes - net	(530,274)	(95,135)
Nuclear decommissioning trusts	(186,382)	(148,040)
Pension, net funding	(93,681)	(95,854)
Deferred fuel	(13,686)	(4,210)
Other	(138,299)	(76,735)
Total	(4,585,762)	(2,901,950)
Regulatory liabilities	634,184	218,278
Pension and other post-employment benefits	73,006	72,724
Sale and leaseback	0	0
Compensation	5,288	3,240
Accumulated deferred investment tax credit	30,666	31,155
Provision for allowances and contingencies	21,768	7,071
Deferred Tax Assets, Power Purchase Arrangements	0	3,381
Net operating loss carryforwards	1,228,547	363,806
Other	5,968	6,958
Deferred Tax Assets, Net of Valuation Allowance	2,013,578	700,307
Deferred Tax Liabilities, Prepaid Expenses	138,330	63,121
Deferred Tax Assets, Deferred Income	9,919
Deferred Tax Liabilities, Deferred Expense		(23,382)
Deferred Tax Liabilities, Accumulated Storm Damage Provision	193,967
Deferred Tax Assets, Capital Losses and Miscellaneous Tax Credits	5,141	9,309
Deferred tax asset Nuclear Decommissioning Liabilities	(909)	7,767
Deferred Tax Liabilities, Net, Noncurrent	(2,433,854)	(2,138,522)
Entergy Mississippi [Member]
Plant basis differences - net	(681,968)	(623,796)
Regulatory assets for income taxes - net	(34,799)	(22,381)
Nuclear decommissioning trusts	0	0
Pension, net funding	(22,253)	(24,922)
Deferred fuel	(30,409)	(1,706)
Other	(29,108)	(27,565)
Total	(798,537)	(700,370)
Regulatory liabilities	59,418	56,022
Deferred tax Liability, Accrued Tax Expense, Compensation and Benefits Pensions	(7,793)	(6,763)
Sale and leaseback	0	0
Compensation	2,181	1,670
Accumulated deferred investment tax credit	2,723	2,261
Provision for allowances and contingencies	10,236	16,799
Deferred Tax Assets, Power Purchase Arrangements	1,140	1,140
Net operating loss carryforwards	166,008	54,262
Other	2,891	3,507
Deferred Tax Assets, Net of Valuation Allowance	240,369	131,887
Accrued Income Taxes, Noncurrent	161,929	78,191
Deferred Tax Assets, Deferred Income	2,306	2,989
Deferred Tax Liabilities, Accumulated Storm Damage Provision	0
Deferred Tax Assets, Capital Losses and Miscellaneous Tax Credits	1,258	0
Deferred tax asset Nuclear Decommissioning Liabilities	1	0
Deferred Tax Liabilities, Net, Noncurrent	(720,097)	(646,674)
Entergy New Orleans [Member]
Plant basis differences - net	(192,660)	(83,457)
Regulatory assets for income taxes - net	(30,694)	(20,276)
Nuclear decommissioning trusts	0	0
Pension, net funding	(11,429)	(11,564)
Deferred fuel	(1,600)	(1,393)
Other	(33,071)	(26,334)
Total	(269,454)	(143,024)
Regulatory liabilities	36,057	31,248
Deferred tax Liability, Accrued Tax Expense, Compensation and Benefits Pensions	(16,090)	(13,997)
Sale and leaseback	0	0
Compensation	1,036	761
Accumulated deferred investment tax credit	4,391	4,197
Provision for allowances and contingencies	5,559	24,529
Deferred Tax Assets, Power Purchase Arrangements	0	(5,324)
Net operating loss carryforwards	105,549	26,564
Other	7,788	8,128
Deferred Tax Assets, Net of Valuation Allowance	155,805	88,881
Accrued Income Taxes, Noncurrent	251,735	284,571
Deferred Tax Assets, Deferred Income	971	877
Deferred Tax Liabilities, Accumulated Storm Damage Provision	0
Deferred Tax Assets, Capital Losses and Miscellaneous Tax Credits	10,977	12,317
Deferred tax asset Nuclear Decommissioning Liabilities	(433)	(419)
Deferred Tax Liabilities, Net, Noncurrent	(365,384)	(338,714)
Entergy Texas [Member]
Plant basis differences - net	(654,252)	(620,669)
Regulatory assets for income taxes - net	(45,470)	(47,684)
Nuclear decommissioning trusts	0	0
Pension, net funding	(19,914)	(19,481)
Deferred fuel	(10,139)	0
Other	(2,526)	(141)
Total	(745,577)	(687,975)
Regulatory liabilities	55,022	47,991
Deferred tax Liability, Accrued Tax Expense, Compensation and Benefits Pensions	(18,793)	(17,132)
Sale and leaseback	0	0
Compensation	1,618	1,308
Accumulated deferred investment tax credit	1,958	2,088
Deferred Tax Liabilities, Deferred Expense, Reserves and Accruals		(4,094)
Provision for allowances and contingencies	7,730
Deferred Tax Assets, Power Purchase Arrangements	(1,202)	(30,932)
Net operating loss carryforwards	81	53,052
Other	863	2,232
Deferred Tax Assets, Net of Valuation Allowance	58,450	60,543
Accrued Income Taxes, Noncurrent	5,369	11,990
Deferred Tax Assets, Deferred Income	10,196	5,909
Deferred Tax Liabilities, Accumulated Storm Damage Provision	13,276
Deferred Tax Assets, Capital Losses and Miscellaneous Tax Credits	883	0
Deferred tax asset Nuclear Decommissioning Liabilities	94	121
Deferred Tax Liabilities, Net, Noncurrent	(692,496)	(639,422)
System Energy [Member]
Plant basis differences - net	(433,874)	(407,125)
Regulatory assets for income taxes - net	(61,205)	(56,496)
Nuclear decommissioning trusts	(153,610)	(131,985)
Pension, net funding	(18,033)	(20,330)
Deferred fuel	(49)	(314)
Other	(5,622)	(12,521)
Total	(672,393)	(628,771)
Regulatory liabilities	224,036	163,534
Deferred tax Liability, Accrued Tax Expense, Compensation and Benefits Pensions	(1,925)	(1,344)
Sale and leaseback	102,474	102,477
Compensation	447	48
Accumulated deferred investment tax credit	10,729	9,706
Provision for allowances and contingencies	0	0
Deferred Tax Assets, Power Purchase Arrangements	0	0
Net operating loss carryforwards	0	0
Other	2	2
Deferred Tax Assets, Net of Valuation Allowance	347,153	311,353
Accrued Income Taxes, Noncurrent	57,691	42,417
Deferred Tax Assets, Deferred Income	0	0
Deferred Tax Liabilities, Accumulated Storm Damage Provision	0
Deferred Tax Assets, Capital Losses and Miscellaneous Tax Credits	1,958	7,014
Deferred tax asset Nuclear Decommissioning Liabilities	9,432	29,916
Deferred Tax Liabilities, Net, Noncurrent	$ (382,931)	$ (359,835)