Income Taxes (Narrative) (Details) - USD ($) $ in Thousands			1 Months Ended								2 Months Ended	3 Months Ended				12 Months Ended								120 Months Ended	180 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Sep. 30, 2025	Jul. 31, 2025	Nov. 30, 2024	Sep. 30, 2024	Aug. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	May 31, 2022	Oct. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2020	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Oct. 01, 2012	Dec. 31, 2026	Jun. 30, 2025	Jan. 01, 2025	Apr. 30, 2024	Dec. 31, 2019
Unrecognized Tax Benefits that Would Impact Effective Tax Rate								$ 1,899,000				$ 1,900,000		$ 1,899,000		$ 2,781,000	$ 1,900,000	$ 1,899,000
Remaining Balances Of Unrecognized Tax Benefits								541,000				455,000		541,000		414,000	455,000	541,000
Unrecognized Tax Benefits, Interest on Income Taxes Expense																10,000	(7,000)	(11,000)
Reduction of income tax expense from the reversal of provisions for uncertain tax positions						$ 9,000
Reduction of income tax expense due reversal of UTPs														288,000
Decrease in operating loss carryforward								8,000,000						8,000,000				8,000,000
Tax liability resulting from audit adjustments								79,000						79,000				79,000
Interest accrued on taxes in excess of deposits								13,000						13,000				13,000
Regulatory Liability, Noncurrent												3,609,463				$ 3,911,839	$ 3,609,463
Reversal of interest expense related to the allowance of previously unrecognized tax benefits								24,000						24,000				$ 24,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	35.00%														21.00%	21.00%	21.00%
Regulatory Liability For Income Taxes - Current and Non Current												1,200,000				$ 1,100,000	$ 1,200,000
Reduction of income tax expense									$ 129,000	$ 283,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued								39,000				32,000		39,000		42,000	32,000	$ 39,000
Deferred Tax Assets, Valuation Allowance												338,508				335,105	338,508
Increase (Decrease) in Regulatory Liabilities																180,811	660,559	463,805
Income Taxes Paid						8,000
Income Tax Expense (Benefit)						9,000										497,952	381,027	(690,535)
Increase in income tax expense resulting from net reduction in certain deferred tax assets and liabilities												12,100
Production tax credits																235,100										$ 571,200
Proceeds from tax credit sales																547,261	0	0
Nuclear production tax credit
Proceeds from tax credit sales											$ 542,200
Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] | Entergy New Orleans and Entergy Louisiana natural gas distribution businesses [Member]
Disposal Group, Assets, Regulatory Asset, Noncurrent												35,381				35,400	35,381
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, tax purposes				$ 328,000
Qualified Plan [Member] | Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] | Entergy New Orleans and Entergy Louisiana natural gas distribution businesses [Member] | Pension Plan [Member]
Disposal Group, Assets, Regulatory Asset, Noncurrent																13,900
Entergy Arkansas [Member]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate								57,200				32,600		57,200		360,300	32,600	57,200
Unrecognized Tax Benefits, Interest on Income Taxes Expense																1,100	600	3,500
Reduction of income tax expense from the reversal of provisions for uncertain tax positions						18,000								156,000
Reduction to income tax expense due to method of accounting																				$ 1,800,000
Decommissioning liability in COGS												102,000					102,000
Deductible temporary difference related to election to mark-to-market certain power purchase and sales agreements																					$ 2,000,000
Accrued increase to tax expense from the settlement of mark-to-market tax position								40,000						40,000				40,000
Miscellaneous excess ADIT as result of 2016-2018 audit resolution								5,000						5,000				5,000
Decrease in operating loss carryforward								4,000,000						4,000,000				4,000,000
Regulatory Liability, Noncurrent												$ 831,165				$ 1,044,060	$ 831,165
Regulatory asset for income tax associated with deficient ADIT								35,000						35,000				$ 35,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent																21.00%	21.00%	21.00%
State Effective Income Tax Rate, Percent												4.30%					4.30%												6.50%
Unrecognized Tax Benefits, Interest on Income Taxes Accrued								7,800				$ 8,400		7,800		$ 9,500	$ 8,400	$ 7,800
Deferred Tax Assets, Valuation Allowance																(1,727)
Increase (Decrease) in Regulatory Liabilities																218,074	97,049	240,762
Reduction/(increase) in income tax expense as a result of the reversal of net deferred credits														9,000
Income Tax Expense (Benefit)																107,880	74,574	(99,210)
Production tax credits																104,400										221,400
Proceeds from tax credit sales																215,224	0	0
Entergy Arkansas [Member] | Solar tax credit
Proceeds from tax credit sales			$ 5,100
Entergy Arkansas [Member] | Nuclear production tax credit
Proceeds from tax credit sales											210,100
Entergy Arkansas [Member] | Walnut Bend Solar facility [Member]
Solar production tax credits												5,000				35,000	5,000
Entergy Mississippi [Member]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate								1,000				1,300		1,000		1,700	1,300	1,000
Unrecognized Tax Benefits, Interest on Income Taxes Expense																1,300	1,100	(1,000)
Reduction of income tax expense from the reversal of provisions for uncertain tax positions														1,000
Deductible temporary difference related to election to mark-to-market certain power purchase and sales agreements																					$ 2,000,000
Decrease in operating loss carryforward								2,000,000						2,000,000				2,000,000
Regulatory Liability, Noncurrent												59,544				$ 144,124	$ 59,544
Regulatory asset for income tax associated with deficient ADIT								3,000						3,000				$ 3,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent																21.00%	21.00%	21.00%
Unrecognized Tax Benefits, Interest on Income Taxes Accrued								2,100				3,200		2,100		$ 4,500	$ 3,200	$ 2,100
Deferred Tax Assets, Valuation Allowance																0
Increase (Decrease) in Regulatory Liabilities																74,631	17,985	(59,513)
Reduction/(increase) in income tax expense as a result of the reversal of net deferred credits														(2,000)
Income Tax Expense (Benefit)																95,101	80,315	54,364
Entergy New Orleans [Member]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate								18,200				18,300		18,200		18,100	18,300	18,200
Unrecognized Tax Benefits, Interest on Income Taxes Expense																1,300	0	(5,800)
Reduction of income tax expense from the reversal of provisions for uncertain tax positions														6,000
Reduction of income tax expense from the reversal of a tax gain														39,000
Deductible temporary difference related to election to mark-to-market certain power purchase and sales agreements																						$ 1,000,000
Reduction of income tax expense due reversal of UTPs														139,000
Decrease in operating loss carryforward								1,000,000						1,000,000				$ 1,000,000
Regulatory Liability, Noncurrent												$ 260,312				$ 312,962	$ 260,312
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent																21.00%	21.00%	21.00%
State Effective Income Tax Rate, Percent												7.50%					7.50%										5.50%
Unrecognized Tax Benefits, Interest on Income Taxes Accrued								600				$ 600		600		$ 1,900	$ 600	$ 600
Deferred Tax Assets, Valuation Allowance																0
Increase (Decrease) in Regulatory Liabilities																26,316	175,808	66,022
Reduction/(increase) in income tax expense as a result of the reversal of net deferred credits														2,000
Income Tax Expense (Benefit)																15,855	2,842	(189,973)
Increase in income tax expense resulting from net reduction in certain deferred tax assets and liabilities												200
Entergy New Orleans [Member] | Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] | Entergy New Orleans natural gas distribution business [Member]
Disposal Group, Assets, Regulatory Asset, Noncurrent												23,682				23,700	23,682
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, tax purposes				179,000
Entergy New Orleans [Member] | Qualified Plan [Member] | Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] | Entergy New Orleans natural gas distribution business [Member] | Pension Plan [Member]
Disposal Group, Assets, Regulatory Asset, Noncurrent																6,700
Entergy Louisiana [Member]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate								862,500				868,200		862,500		1,141,900	868,200	862,500
Unrecognized Tax Benefits, Interest on Income Taxes Expense																8,600	3,600	(2,600)
Deductible temporary difference related to election to mark-to-market certain power purchase and sales agreements																							$ 2,000,000
Reduction of income tax expense due reversal of UTPs														132,000
Decrease in operating loss carryforward								1,000,000						1,000,000				1,000,000
Regulatory Liability, Noncurrent												$ 1,692,547				$ 1,630,763	$ 1,692,547
Regulatory asset for income tax associated with deficient ADIT								2,000						2,000				$ 2,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%															21.00%	21.00%	21.00%				35.00%
State Effective Income Tax Rate, Percent												7.50%					7.50%										5.50%
Reduction of income tax expense									133,000	290,000
Regulatory charge recorded as a result of reduction in income tax expense										224,000					$ 103,000
Regulatory charge recorded as a result of reduction in income tax expense, net of tax										$ 165,000					$ 76,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued								1,500				$ 5,100		1,500		$ 13,700	$ 5,100	$ 1,500
Customer rate credits																								$ 11,000
Deferred Tax Assets, Valuation Allowance																(5)
Increase (Decrease) in Regulatory Liabilities									103,000							(110,727)	452,731	225,645
Reduction/(increase) in income tax expense as a result of the reversal of net deferred credits														42,000
Income Tax Expense (Benefit)																237,813	225,409	(205,781)
Increase in income tax expense resulting from net reduction in certain deferred tax assets and liabilities												16,300
Increase (decrease) in regulatory liabilities (net of tax)									$ 76,000
Production tax credits																58,600										208,900
Proceeds from tax credit sales																198,285	0	0
Entergy Louisiana [Member] | Nuclear production tax credit
Proceeds from tax credit sales											198,300
Entergy Louisiana [Member] | Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] | Entergy Louisiana natural gas distribution business [Member]
Disposal Group, Assets, Regulatory Asset, Noncurrent												8,947				8,900	8,947
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, tax purposes				$ 149,000
Entergy Louisiana [Member] | Qualified Plan [Member] | Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] | Entergy Louisiana natural gas distribution business [Member] | Pension Plan [Member]
Disposal Group, Assets, Regulatory Asset, Noncurrent																4,500
Entergy Louisiana [Member] | 2023 Entergy Louisiana Rate Case and Formula Rate Plan Extension Request [Member]
Customer rate credits						$ 184,000	$ 184,000
System Energy [Member]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate								3,100				4,000		3,100		218,000	4,000	3,100
Unrecognized Tax Benefits, Interest on Income Taxes Expense																(600)	1,000	0
Decrease in operating loss carryforward								40,000						40,000				$ 40,000
Regulatory Liability, Noncurrent												747,190				$ 897,301	$ 747,190
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent																21.00%	21.00%	21.00%
Unrecognized Tax Benefits, Interest on Income Taxes Accrued								1,900				2,900		1,900		$ 2,300	$ 2,900	$ 1,900
Deferred Tax Assets, Valuation Allowance																0
Increase (Decrease) in Regulatory Liabilities																144,604	(37,713)	11,009
Reduction/(increase) in income tax expense as a result of the reversal of net deferred credits														1,000
Income Tax Expense (Benefit)																19,575	29,503	32,032
Production tax credits																72,100										$ 140,900
Proceeds from tax credit sales																133,752	0	0
System Energy [Member] | Nuclear production tax credit
Proceeds from tax credit sales											$ 133,800
Entergy Texas [Member]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate								2,900				50,300		2,900		113,600	50,300	2,900
Unrecognized Tax Benefits, Interest on Income Taxes Expense																800	500	$ (1,100)
Deductible temporary difference related to election to mark-to-market certain power purchase and sales agreements																				$ 2,500,000
Regulatory Liability, Noncurrent												18,705				$ 138,969	$ 18,705
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent																21.00%	21.00%	21.00%
Unrecognized Tax Benefits, Interest on Income Taxes Accrued								0				500		0		$ 1,300	$ 500	$ 0
Deferred Tax Assets, Valuation Allowance																0
Increase (Decrease) in Regulatory Liabilities																84,253	(45,301)	(20,122)
Reduction/(increase) in income tax expense as a result of the reversal of net deferred credits														2,000
Income Tax Expense (Benefit)																65,366	65,684	62,872
Subsequent Event [Member] | Entergy Louisiana [Member]
Customer rate credits																									$ 20,235
Credits expected to be shared with customers from resolution of the 2016-2018 IRS audit [Member]
Regulatory Liability, Noncurrent												163,300				132,500	163,300
Credits expected to be shared with customers from resolution of the 2016-2018 IRS audit [Member] | Entergy New Orleans [Member]
Regulatory Liability, Noncurrent								60,000				138,000	$ 138,000	60,000		132,500	138,000	60,000										$ 138,000
Increase (Decrease) in Regulatory Liabilities													78,000
Regulatory charge, net of tax								44,000					$ 57,000
Credits expected to be shared with customers from resolution of the 2016-2018 IRS audit [Member] | Entergy Louisiana [Member]
Regulatory Liability, Noncurrent								38,000				$ 25,300		38,000		0	25,300	38,000
Regulatory charge, net of tax								28,000
Credits expected to be shared with customers from resolution of the 2016-2018 IRS audit [Member] | Entergy Louisiana [Member] | 2023 Entergy Louisiana Rate Case and Formula Rate Plan Extension Request [Member]
Regulatory Liability, Noncurrent								$ 38,000						$ 38,000				38,000
Income taxes | Entergy Arkansas [Member]
Increase (Decrease) in Regulatory Liabilities																$ 29,000	$ 26,000	$ 15,000	$ 32,000
Income taxes | Entergy New Orleans [Member]
Increase (Decrease) in Regulatory Liabilities					$ 9,000
Income taxes | Entergy Louisiana [Member]
Increase (Decrease) in Regulatory Liabilities					$ 179,000