CONSOLIDATED STATEMENTS OF INCOME - AEP Transmission Holdco - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
REVENUES
TOTAL REVENUES	$ 21,876	$ 19,721	$ 18,982
EXPENSES
Other Operation	2,950	3,127	2,811
Maintenance	1,499	1,325	1,276
Depreciation and Amortization	3,380	3,290	3,090
Taxes Other Than Income Taxes	1,631	1,596	1,492
TOTAL EXPENSES	16,557	15,417	15,426
OPERATING INCOME	5,319	4,304	3,556
Other Income (Expense):
Allowance for Equity Funds Used During Construction	245	211	175
Interest Expense	(2,026)	(1,863)	(1,807)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS	3,724	2,843	2,209
Income Tax Expense	129	(39)	55
NET INCOME	3,696	2,976	2,213
Net Income Attributable to Noncontrolling Interest	116	9	5
EARNINGS ATTRIBUTABLE TO AEP MEMBER, Basic	3,580	2,967	2,208
EARNINGS ATTRIBUTABLE TO AEP MEMBER, Diluted	3,580	2,967	2,208
Nonrelated Party
REVENUES
TOTAL REVENUES	21,876	19,721	18,982
AEP TRANSMISSION COMPANY, LLC
REVENUES
TOTAL REVENUES	2,319	1,891	1,671
EXPENSES
Other Operation	154	137	109
Maintenance	31	21	20
Depreciation and Amortization	478	431	394
Taxes Other Than Income Taxes	321	309	283
TOTAL EXPENSES	984	898	806
OPERATING INCOME	1,335	993	865
Other Income (Expense):
Interest Income	5	10	8
Allowance for Equity Funds Used During Construction	93	89	83
Interest Expense	(234)	(214)	(195)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS	1,199	878	761
Income Tax Expense	15	190	147
NET INCOME	1,184	688	614
Net Income Attributable to Noncontrolling Interest	109	0	0
EARNINGS ATTRIBUTABLE TO AEP MEMBER, Basic	1,075	688	614
EARNINGS ATTRIBUTABLE TO AEP MEMBER, Diluted	1,075	688	614
AEP TRANSMISSION COMPANY, LLC | Affiliated Entity
REVENUES
TOTAL REVENUES	1,869	1,512	1,317
AEP TRANSMISSION COMPANY, LLC | Nonrelated Party
REVENUES
TOTAL REVENUES	450	379	354
AEP TRANSMISSION COMPANY, LLC | Transmission
REVENUES
TOTAL REVENUES	428	401	363
AEP TRANSMISSION COMPANY, LLC | Sales to AEP Affiliates
REVENUES
TOTAL REVENUES	1,790	1,582	1,463
AEP TRANSMISSION COMPANY, LLC | (Provision For) Reversal Of Refund | Affiliated Entity
REVENUES
TOTAL REVENUES	79	(70)	(146)
AEP TRANSMISSION COMPANY, LLC | (Provision For) Reversal Of Refund | Nonrelated Party
REVENUES
TOTAL REVENUES	$ 22	$ (22)	$ (9)