Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended		9 Months Ended
	Oct. 31, 2025	Sep. 30, 2025	Jul. 31, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Jun. 30, 2025	Dec. 31, 2024
Regulatory Liability, Noncurrent		$ 3,834,485		$ 3,834,485		$ 3,834,485			$ 3,609,463
Increase (Decrease) in Regulatory Liabilities						143,848	$ 566,451
Income Tax Expense (Benefit)				205,307	$ 215,475	443,747	270,103
Production tax credits								$ 571,200
Proceeds from tax credit sales						405,256	0
Nuclear production tax credit
Proceeds from tax credit sales		400,200
Disposal Group, Held-for-Sale, Not Discontinued Operations | Entergy New Orleans and Entergy Louisiana natural gas distribution businesses
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal			$ 17,000
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, tax purposes			327,000
Subsequent Event [Member] | Nuclear production tax credit
Proceeds from tax credit sales	$ 142,000
Entergy New Orleans [Member]
Regulatory Liability, Noncurrent		245,892		245,892		245,892			260,312
Increase (Decrease) in Regulatory Liabilities						(41,353)	169,542
Income Tax Expense (Benefit)				7,080	14,438	16,563	2,597
Entergy New Orleans [Member] | Disposal Group, Held-for-Sale, Not Discontinued Operations | Entergy New Orleans natural gas distribution business
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal			7,000
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, tax purposes			179,000
Entergy Arkansas [Member]
Regulatory Liability, Noncurrent		983,576		983,576		983,576			831,165
Increase (Decrease) in Regulatory Liabilities						160,749	70,199
Income Tax Expense (Benefit)				54,230	35,862	102,909	57,308
Production tax credits								221,400
Proceeds from tax credit sales						0	160,179
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		155,100
Entergy Arkansas [Member] | Subsequent Event [Member] | Nuclear production tax credit
Proceeds from tax credit sales	55,000
Entergy Louisiana [Member]
Regulatory Liability, Noncurrent		1,634,337		1,634,337		1,634,337			1,692,547
Increase (Decrease) in Regulatory Liabilities						(89,444)	384,975
Income Tax Expense (Benefit)				83,299	102,303	209,902	161,977
Production tax credits								208,900
Proceeds from tax credit sales						146,355	0
Entergy Louisiana [Member] | Nuclear production tax credit
Proceeds from tax credit sales		146,400
Entergy Louisiana [Member] | Disposal Group, Held-for-Sale, Not Discontinued Operations | Entergy Louisiana natural gas distribution business
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal			17,000
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, tax purposes			$ 148,000
Entergy Louisiana [Member] | Subsequent Event [Member] | Nuclear production tax credit
Proceeds from tax credit sales	51,900
System Energy [Member]
Regulatory Liability, Noncurrent		883,655		883,655		883,655			$ 747,190
Increase (Decrease) in Regulatory Liabilities						131,917	(45,306)
Income Tax Expense (Benefit)				$ 5,679	$ 8,219	17,074	23,752
Production tax credits								$ 140,900
Proceeds from tax credit sales						$ 98,722	$ 0
System Energy [Member] | Nuclear production tax credit
Proceeds from tax credit sales		$ 98,700
System Energy [Member] | Subsequent Event [Member] | Nuclear production tax credit
Proceeds from tax credit sales	$ 35,100