FINANCING ACTIVITIES - Dividend Restrictions Narrative (Details)	9 Months Ended
	Sep. 30, 2025
Dividends Payable [Line Items]
Maximum percentage debt to capitalization	67.50%
I&M
Dividends Payable [Line Items]
Maximum percentage debt to capitalization	67.50%
AEP Texas
Dividends Payable [Line Items]
Maximum percentage debt to capitalization	67.50%
APCo
Dividends Payable [Line Items]
Maximum percentage debt to capitalization	67.50%
SWEPCo
Dividends Payable [Line Items]
Maximum percentage debt to capitalization	67.50%
PSO
Dividends Payable [Line Items]
Maximum percentage debt to capitalization	67.50%
AEPTCo
Dividends Payable [Line Items]
Maximum percentage debt to capitalization	67.50%