CONSOLIDATED STATEMENTS OF INCOME - AEP Transmission Holdco - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
REVENUES
TOTAL REVENUES	$ 19,721.3	$ 18,982.3	$ 19,639.5
EXPENSES
Other Operation	3,127.6	2,810.5	2,878.1
Maintenance	1,325.1	1,276.3	1,249.4
Depreciation and Amortization	3,289.9	3,090.4	3,202.8
Taxes Other Than Income Taxes	1,596.3	1,492.3	1,469.8
TOTAL EXPENSES	15,417.7	15,426.1	16,156.8
OPERATING INCOME	4,303.6	3,556.2	3,482.7
Other Income (Expense):
Allowance for Equity Funds Used During Construction	211.0	174.9	133.7
Interest Expense	(1,862.8)	(1,806.9)	(1,396.1)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS)	2,842.9	2,208.7	2,420.4
Income Tax Expense (Benefit)	(39.2)	54.6	5.4
AEP TRANSMISSION COMPANY, LLC
REVENUES
TOTAL REVENUES	1,890.9	1,672.0	1,624.5
EXPENSES
Other Operation	137.4	109.0	136.3
Maintenance	20.9	20.4	17.2
Depreciation and Amortization	430.9	393.8	346.2
Taxes Other Than Income Taxes	308.7	283.2	271.1
TOTAL EXPENSES	897.9	806.4	770.8
OPERATING INCOME	993.0	865.6	853.7
Other Income (Expense):
Interest Income	10.5	7.0	1.6
Allowance for Equity Funds Used During Construction	89.4	83.2	70.7
Interest Expense	(214.2)	(194.5)	(162.7)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS)	878.7	761.3	763.3
Income Tax Expense (Benefit)	190.3	147.1	169.1
NET INCOME	688.4	614.2	594.2
AEP TRANSMISSION COMPANY, LLC | Affiliated Entity
REVENUES
TOTAL REVENUES	1,512.3	1,317.8	1,283.8
AEP TRANSMISSION COMPANY, LLC | Nonrelated Party
REVENUES
TOTAL REVENUES	378.6	354.2	340.9
Transmission | AEP TRANSMISSION COMPANY, LLC
REVENUES
TOTAL REVENUES	400.9	363.3	354.9
Sales to AEP Affiliates | AEP TRANSMISSION COMPANY, LLC | Affiliated Entity
REVENUES
TOTAL REVENUES	1,582.3	1,463.4	1,354.5
Provision for Refund | AEP TRANSMISSION COMPANY, LLC | Affiliated Entity
REVENUES
TOTAL REVENUES	(70.0)	(145.6)	(70.7)
Provision for Refund | AEP TRANSMISSION COMPANY, LLC | Nonrelated Party
REVENUES
TOTAL REVENUES	$ (22.3)	$ (9.1)	$ (14.2)