Segment Reporting (Reconciliation of Operating Profit (Loss) from Segments to Consolidated) (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues		$ 12,946,686	$ 11,879,653	$ 12,147,412
Utilities Operating Expense, Fuel Used		2,359,403	2,256,874	2,801,580
Utilities Operating Expense, Purchased Power		1,240,998	839,236	968,036
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses		3,055,097	2,898,237	2,898,213
Other Regulatory Charges (Credits) - Net		(161,546)	(6,133)	(138,469)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		1,773,328	1,061,184	2,362,310
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement		(92,421)	(489,970)	(201,013)
Income Tax Expense (Benefit)	$ 9,000	497,952	381,027	(690,535)
Asset Impairment Charges		12,795	107,134	42,679
Preferred dividend requirements of subsidiaries and net income (loss) attributable to noncontrolling interests		15,056	5,594	5,774
Net Income (Loss) Available to Common Stockholders, Basic		1,758,272	1,055,590	2,356,536
Entergy Arkansas [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues		2,784,047	2,460,181	2,646,396
Utilities Operating Expense, Fuel Used		352,535	274,282	514,885
Utilities Operating Expense, Purchased Power		248,901	239,281	257,890
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses		778,445	742,573	737,649
Other Regulatory Charges (Credits) - Net		(62,186)	(152,834)	(87,409)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		437,453	319,466	396,850
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement		(10,536)	(17,995)	(23,216)
Income Tax Expense (Benefit)		107,880	74,574	(99,210)
Asset Impairment Charges		0	131,775	78,434
Entergy Louisiana [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues		5,732,099	5,144,018	5,147,770
Utilities Operating Expense, Fuel Used		1,311,773	1,026,343	1,080,485
Utilities Operating Expense, Purchased Power		895,174	670,874	654,721
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses		1,136,573	1,097,283	1,097,233
Other Regulatory Charges (Credits) - Net		(176,001)	41,525	41,209
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		1,112,900	890,771	1,273,370
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement		(66,313)	(123,280)	(160,972)
Income Tax Expense (Benefit)		237,813	225,409	(205,781)
Entergy Mississippi [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues		1,955,705	1,764,593	1,802,533
Utilities Operating Expense, Fuel Used		165,590	270,015	563,296
Utilities Operating Expense, Purchased Power		374,694	273,580	281,761
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses		371,096	315,651	320,192
Other Regulatory Charges (Credits) - Net		73,111	36,723	(111,376)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		308,728	245,407	181,969
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement		3,953	(11,157)	(13,231)
Income Tax Expense (Benefit)		95,101	80,315	54,364
Entergy New Orleans [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues		772,214	810,564	843,933
Utilities Operating Expense, Fuel Used		92,621	99,055	122,400
Utilities Operating Expense, Purchased Power		271,170	252,863	268,478
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses		157,415	172,101	167,719
Other Regulatory Charges (Credits) - Net		(12,654)	85,136	69,211
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		50,411	15,847	228,938
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement		(3,695)	(115)	(4,119)
Income Tax Expense (Benefit)		15,855	2,842	(189,973)
Asset Impairment Charges		12,795	0	0
Entergy Texas [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues		2,127,584	2,050,150	2,028,586
Utilities Operating Expense, Fuel Used		351,554	482,486	403,111
Utilities Operating Expense, Purchased Power		497,113	373,036	468,511
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses		359,812	340,956	323,797
Other Regulatory Charges (Credits) - Net		13,732	(13,884)	7,324
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		334,071	293,622	291,273
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement		(8,824)	(11,113)	(10,411)
Income Tax Expense (Benefit)		65,366	65,684	62,872
Net Income (Loss) Available to Common Stockholders, Basic		331,999	291,550	289,201
System Energy [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues		581,481	585,049	586,603
Utilities Operating Expense, Fuel Used		64,507	62,433	71,762
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses		189,628	192,300	207,765
Other Regulatory Charges (Credits) - Net		2,453	(2,799)	(57,429)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		88,095	103,500	108,772
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement		106	672	(9,101)
Income Tax Expense (Benefit)		19,575	29,503	32,032
Group annuity contract purchase | Pension Plan [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement			328,000
Consolidation, Eliminations
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues		(90)	(63)	(41)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		(295,371)	(312,860)	(298,979)
Income Tax Expense (Benefit)		0	0	0
Asset Impairment Charges		0	0	0
Utility [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions				568,000
Utility [Member] | Group annuity contract purchase | Pension Plan [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement			8,000
Utility [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues		12,887,921	11,805,802	12,022,944
Utilities Operating Expense, Fuel Used		2,338,347	2,214,471	2,755,793
Utilities Operating Expense, Purchased Power		1,227,715	806,646	904,184
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses		3,013,000	2,851,165	2,838,057
Other Regulatory Charges (Credits) - Net		(161,546)	(6,133)	(138,469)
Segment Reporting, Other Segment Item, Amount		4,177,829	4,109,352	3,152,475
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		2,292,576	1,830,301	2,510,904
Income Tax Expense (Benefit)		551,272	515,665	(374,847)
Asset Impairment Charges		12,795	131,775	79,962
Corporate Segment and Other Operating Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions				275,000
Corporate Segment and Other Operating Segment [Member] | Group annuity contract purchase | Pension Plan [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement			320,000
Corporate Segment and Other Operating Segment [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues		58,855	73,914	124,509
Income Tax Expense (Benefit)		(53,320)	(134,638)	(315,688)
Asset Impairment Charges		0	(24,641)	(37,283)
Corporate Segment and Other Operating Segment [Member] | Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		(223,877)	(203,097)	(125,018)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement			(319,675)
Income Tax Expense (Benefit)				275,403
Income Tax Expense (Benefit) on Reconciling Items		$ 0	$ 66,515	$ 0