FINANCING ACTIVITIES - Financing Activities Subsequent Event (Details) - Subsequent Event $ in Millions	1 Months Ended
Jul. 30, 2025 USD ($)
AEP Texas
Debt Instrument [Line Items]
Proceeds from contributed capital	$ 200
Pollution Control Bond \| AEGCo
Debt Instrument [Line Items]
Debt retired	45
Notes Payable \| I&M
Debt Instrument [Line Items]
Debt retired	10
Other Long-term Debt \| Transource Energy
Debt Instrument [Line Items]
Debt instrument, face amount	$ 4

Face (par) amount of debt instrument at time of issuance.

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