SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT COMPANY - CONDENSED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Details) - USD ($) $ / shares in Units, $ 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
Depreciation and Amortization	3,380	3,290	3,090
TOTAL EXPENSES	16,557	15,417	15,426
OPERATING INCOME	5,319	4,304	3,556
Other Income (Expense):
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 (Benefit)	129	(39)	55
Equity Earnings of Unconsolidated Subsidiaries	101	94	59
Other Comprehensive Income (Loss)	39	52	(139)
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS	$ 3,619	$ 3,019	$ 2,069
WEIGHTED AVERAGE NUMBER OF BASIC AEP COMMON SHARES OUTSTANDING (in shares)	534,535,444	530,092,672	518,903,682
TOTAL BASIC EARNINGS PER SHARE ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS (in USD per share)	$ 6.70	$ 5.60	$ 4.26
WEIGHTED AVERAGE NUMBER OF DILUTED AEP COMMON SHARES OUTSTANDING (in shares)	537,467,865	531,337,703	520,206,258
TOTAL DILUTED EARNINGS PER SHARE ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS (in USD per share)	$ 6.66	$ 5.58	$ 4.24
Parent Company
REVENUES
Total Revenues	$ 7	$ 6	$ 5
EXPENSES
Other Operation	35	66	17
Depreciation and Amortization	1	1	1
Amortization of KPCo Basis Difference	(21)	(21)	(17)
TOTAL EXPENSES	15	46	1
OPERATING INCOME	(8)	(40)	4
Other Income (Expense):
Interest Income	102	108	181
Interest Expense	(548)	(532)	(526)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS	(454)	(464)	(341)
Income Tax Expense (Benefit)	(126)	(151)	(81)
Equity Earnings of Unconsolidated Subsidiaries	3,908	3,280	2,468
NET INCOME	3,580	2,967	2,208
Other Comprehensive Income (Loss)	39	52	(139)
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS	$ 3,619	$ 3,019	$ 2,069
WEIGHTED AVERAGE NUMBER OF BASIC AEP COMMON SHARES OUTSTANDING (in shares)	534,535,444	530,092,672	518,903,682
TOTAL BASIC EARNINGS PER SHARE ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS (in USD per share)	$ 6.70	$ 5.60	$ 4.26
WEIGHTED AVERAGE NUMBER OF DILUTED AEP COMMON SHARES OUTSTANDING (in shares)	537,467,865	531,337,703	520,206,258
TOTAL DILUTED EARNINGS PER SHARE ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS (in USD per share)	$ 6.66	$ 5.58	$ 4.24