FINANCING ACTIVITIES - Schedule of Dividend Restrictions (Details) $ in Millions	Dec. 31, 2024 USD ($)
Dividends Payable [Line Items]
Restricted Retained Earnings	$ 3,247.9
AEP TEXAS INC.
Dividends Payable [Line Items]
Restricted Retained Earnings	1,109.2
AEP TRANSMISSION COMPANY, LLC
Dividends Payable [Line Items]
Restricted Retained Earnings	0.0
APPALACHIAN POWER COMPANY
Dividends Payable [Line Items]
Restricted Retained Earnings	539.2
INDIANA MICHIGAN POWER COMPANY
Dividends Payable [Line Items]
Restricted Retained Earnings	707.0
OHIO POWER COMPANY
Dividends Payable [Line Items]
Restricted Retained Earnings	0.0
PUBLIC SERVICE COMPANY OF OKLAHOMA
Dividends Payable [Line Items]
Restricted Retained Earnings	267.7
SOUTHWESTERN ELECTRIC POWER COMPANY
Dividends Payable [Line Items]
Restricted Retained Earnings	$ 366.5