v3.26.1
FINANCING ACTIVITIES - Dividend Restrictions Narrative (Details)
6 Months Ended
Jun. 30, 2026
Dividends Payable [Line Items]  
Maximum percentage debt to capitalization 67.50%
INDIANA MICHIGAN POWER COMPANY  
Dividends Payable [Line Items]  
Maximum percentage debt to capitalization 67.50%
AEP TEXAS INC.  
Dividends Payable [Line Items]  
Maximum percentage debt to capitalization 67.50%
APPALACHIAN POWER COMPANY  
Dividends Payable [Line Items]  
Maximum percentage debt to capitalization 67.50%
SOUTHWESTERN ELECTRIC POWER COMPANY  
Dividends Payable [Line Items]  
Maximum percentage debt to capitalization 67.50%
PUBLIC SERVICE COMPANY OF OKLAHOMA  
Dividends Payable [Line Items]  
Maximum percentage debt to capitalization 67.50%
AEP TRANSMISSION COMPANY, LLC  
Dividends Payable [Line Items]  
Maximum percentage debt to capitalization 67.50%