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v3.25.1

FINANCING ACTIVITIES - Repayments and Retirements of Debt (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 30, 2025 | Mar. 31, 2025 | Mar. 31, 2024
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 229.1 | $ 1,162.2
AEP Texas |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | 12.2 | 11.9
AEP Texas | Subsequent Event |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from contributed capital | $ 250.0 |  |
AEP Texas | 2.06% Securitization Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 10.4 |
Interest Rate |  | 2.06% |
I&M |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 26.5 | 25.4
APCo |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | 14.0 | 313.4
PSO |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | 125.1 | 0.1
AEPTCo |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | 50.0 | $ 0.0
SWEPCo | Subsequent Event |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from contributed capital | $ 450.0 |  |
Securitization Bonds | AEP Texas | 2.29% Securitization Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 1.8 |
Interest Rate |  | 2.29% |
Securitization Bonds | APCo |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 14.0 |
Interest Rate |  | 3.77% |
Senior Unsecured Notes | Transource Energy |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 1.3 |
Interest Rate |  | 2.75% |
Senior Unsecured Notes | PSO |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 125.0 |
Interest Rate |  | 3.17% |
Senior Unsecured Notes | AEPTCo |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 50.0 |
Interest Rate |  | 3.66% |
Notes Payable | I&M | Subsequent Event |  |  |
Debt Instrument [Line Items] |  |  |
Interest Rate | 4.89% |  |
Debt retired | $ 8.0 |  |
Debt instrument, face amount | 100.0 |  |
Notes Payable | I&M | Variable Note Payable |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 0.8 |
Notes Payable | I&M | 0.94% Note Payable |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 1.3 |
Interest Rate |  | 0.93% |
Notes Payable | I&M | 3.44% Note Payable |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 5.0 |
Interest Rate |  | 3.44% |
Notes Payable | I&M | 5.93% Note Payable |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 4.3 |
Interest Rate |  | 5.93% |
Notes Payable | I&M | 6.01% Note Payable |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 6.8 |
Interest Rate |  | 6.01% |
Notes Payable | I&M | 6.41% Note Payable |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 8.1 |
Interest Rate |  | 6.41% |
Other Long-term Debt | I&M |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 0.2 |
Interest Rate |  | 6.00% |
Other Long-term Debt | Transource Energy | Subsequent Event |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, face amount | 1.0 |  |
Other Long-term Debt | PSO |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 0.1 |
Interest Rate |  | 3.00% |
Other Long-term Debt | Wheeling Power Company | Subsequent Event |  |  |
Debt Instrument [Line Items] |  |  |
Debt retired | 15.0 |  |
Pollution Control Bond | I&M | Subsequent Event |  |  |
Debt Instrument [Line Items] |  |  |
Debt retired | $ 40.0 |  |

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