SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT COMPANY - AEPTCO PARENT - CONDENSED STATEMENTS OF INCOME (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
EXPENSES
Other Operation	$ 3,127,600	$ 2,810,500	$ 2,878,100
TOTAL EXPENSES	15,417,700	15,426,100	16,156,800
OPERATING INCOME	4,303,600	3,556,200	3,482,700
Other Income (Expense):
Interest Expense	(1,862,800)	(1,806,900)	(1,396,100)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS)	2,842,900	2,208,700	2,420,400
Income Tax Expense (Benefit)	(39,200)	54,600	5,400
Equity Earnings (Loss) of Unconsolidated Subsidiaries	93,700	58,500	(109,400)
Parent Company
EXPENSES
Other Operation	66,000	16,700	84,900
TOTAL EXPENSES	45,200	700	448,600
OPERATING INCOME	(39,700)	4,400	(443,500)
Other Income (Expense):
Interest Income	107,900	181,000	80,300
Interest Expense	(531,800)	(526,300)	(275,500)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS)	(463,600)	(340,900)	(638,700)
Income Tax Expense (Benefit)	(150,500)	(80,800)	(136,300)
Equity Earnings (Loss) of Unconsolidated Subsidiaries	3,280,200	2,468,200	2,809,600
NET INCOME	2,967,100	2,208,100	2,307,200
AEP TRANSMISSION COMPANY, LLC
EXPENSES
Other Operation	137,400	109,000	136,300
TOTAL EXPENSES	897,900	806,400	770,800
OPERATING INCOME	993,000	865,600	853,700
Other Income (Expense):
Interest Expense	(214,200)	(194,500)	(162,700)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS)	878,700	761,300	763,300
Income Tax Expense (Benefit)	190,300	147,100	169,100
NET INCOME	688,400	614,200	594,200
AEP TRANSMISSION COMPANY, LLC | Parent Company
EXPENSES
Other Operation	1,700	200	700
TOTAL EXPENSES	1,700	200	700
OPERATING INCOME	(1,700)	(200)	(700)
Other Income (Expense):
Interest Income	241,100	218,000	177,800
Interest Expense	(238,700)	(215,100)	(177,100)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS)	700	2,700	0
Income Tax Expense (Benefit)	100	1,400	0
Equity Earnings (Loss) of Unconsolidated Subsidiaries	687,800	612,900	594,200
NET INCOME	688,400	614,200	594,200
AEP TRANSMISSION COMPANY, LLC | Parent Company | Short-Term Lending | Affiliated Entity
Other Income (Expense):
Interest Income	$ 3,000	$ 3,000	$ 915