FINANCING ACTIVITIES - Long-term Debt Subsequent Events Narrative (Details) - Subsequent Event - USD ($) $ in Millions	1 Months Ended
	Feb. 13, 2025	Jan. 31, 2025
INDIANA MICHIGAN POWER COMPANY
Debt Instrument [Line Items]
Debt retired	$ 4	$ 9
Transource Energy | Other Long-term Debt
Debt Instrument [Line Items]
Debt issued		2
KPCo | Term loan
Debt Instrument [Line Items]
Debt issued		$ 150
APPALACHIAN POWER COMPANY | Securitization Bonds
Debt Instrument [Line Items]
Debt retired	14
AEP TEXAS INC. | Securitization Bonds
Debt Instrument [Line Items]
Debt retired	$ 12