DERIVATIVES AND HEDGING - Schedule of the Notional Volume of Derivative Instruments (Details) gal in Millions, MWh in Millions, MMBTU in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) MMBTU MWh gal	Dec. 31, 2023 USD ($) MWh MMBTU gal
Power (MWhs)
Derivative [Line Items]
Notional amount, energy measure | MWh	282.4	246.8
Power (MWhs) | AEP Texas
Derivative [Line Items]
Notional amount, energy measure | MWh	0.0	0.0
Power (MWhs) | APCo
Derivative [Line Items]
Notional amount, energy measure | MWh	23.6	16.8
Power (MWhs) | I&M
Derivative [Line Items]
Notional amount, energy measure | MWh	7.7	5.9
Power (MWhs) | OPCo
Derivative [Line Items]
Notional amount, energy measure | MWh	2.0	2.2
Power (MWhs) | PSO
Derivative [Line Items]
Notional amount, energy measure | MWh	5.0	4.1
Power (MWhs) | SWEPCo
Derivative [Line Items]
Notional amount, energy measure | MWh	4.6	2.9
Natural Gas (MMBtus)
Derivative [Line Items]
Notional amount, energy measure | MMBTU	152.8	151.6
Natural Gas (MMBtus) | AEP Texas
Derivative [Line Items]
Notional amount, energy measure | MMBTU	0.0	0.0
Natural Gas (MMBtus) | APCo
Derivative [Line Items]
Notional amount, energy measure | MMBTU	42.2	37.3
Natural Gas (MMBtus) | I&M
Derivative [Line Items]
Notional amount, energy measure | MMBTU	0.0	0.0
Natural Gas (MMBtus) | OPCo
Derivative [Line Items]
Notional amount, energy measure | MMBTU	0.0	0.0
Natural Gas (MMBtus) | PSO
Derivative [Line Items]
Notional amount, energy measure | MMBTU	46.2	34.9
Natural Gas (MMBtus) | SWEPCo
Derivative [Line Items]
Notional amount, energy measure | MMBTU	15.4	17.9
Heating Oil and Gasoline (Gallons)
Derivative [Line Items]
Notional amount, volume | gal	7.9	6.5
Heating Oil and Gasoline (Gallons) | AEP Texas
Derivative [Line Items]
Notional amount, volume | gal	2.0	1.8
Heating Oil and Gasoline (Gallons) | APCo
Derivative [Line Items]
Notional amount, volume | gal	0.9	1.0
Heating Oil and Gasoline (Gallons) | I&M
Derivative [Line Items]
Notional amount, volume | gal	2.0	0.6
Heating Oil and Gasoline (Gallons) | OPCo
Derivative [Line Items]
Notional amount, volume | gal	1.1	1.2
Heating Oil and Gasoline (Gallons) | PSO
Derivative [Line Items]
Notional amount, volume | gal	0.7	0.7
Heating Oil and Gasoline (Gallons) | SWEPCo
Derivative [Line Items]
Notional amount, volume | gal	0.9	0.9
Interest Rate (USD)
Derivative [Line Items]
Notional amount	$ 59.3	$ 80.1
Interest Rate (USD) | AEP Texas
Derivative [Line Items]
Notional amount	0.0	0.0
Interest Rate (USD) | APCo
Derivative [Line Items]
Notional amount	0.0	0.0
Interest Rate (USD) | I&M
Derivative [Line Items]
Notional amount	0.0	0.0
Interest Rate (USD) | OPCo
Derivative [Line Items]
Notional amount	0.0	0.0
Interest Rate (USD) | PSO
Derivative [Line Items]
Notional amount	0.0	0.0
Interest Rate (USD) | SWEPCo
Derivative [Line Items]
Notional amount	0.0	0.0
Interest Rate on Long-term Debt (USD)
Derivative [Line Items]
Notional amount	950.0	1,300.0
Interest Rate on Long-term Debt (USD) | AEP Texas
Derivative [Line Items]
Notional amount	0.0	150.0
Interest Rate on Long-term Debt (USD) | APCo
Derivative [Line Items]
Notional amount	0.0	0.0
Interest Rate on Long-term Debt (USD) | I&M
Derivative [Line Items]
Notional amount	0.0	0.0
Interest Rate on Long-term Debt (USD) | OPCo
Derivative [Line Items]
Notional amount	0.0	0.0
Interest Rate on Long-term Debt (USD) | PSO
Derivative [Line Items]
Notional amount	0.0	0.0
Interest Rate on Long-term Debt (USD) | SWEPCo
Derivative [Line Items]
Notional amount	$ 0.0	$ 0.0