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v3.25.3

FINANCING ACTIVITIES - Repayments and Retirements of Debt (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 29, 2025 | Sep. 30, 2025 | Sep. 30, 2024
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 2,803.8 | $ 1,969.1
5.70% Junior Subordinated Notes | Junior Subordinated Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 850.0 |
Interest Rate |  | 5.70% |
AEP Texas |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 474.5 | 256.5
AEP Texas | Variable Other Long-term Debt | Other Long-term Debt |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | 400.0 |
AEP Texas | 2.06% Securitization Bonds | Securitization Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 10.3 |
Interest Rate |  | 2.06% |
AEP Texas | 2.29% Securitization Bonds | Securitization Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 14.2 |
Interest Rate |  | 2.29% |
AEP Texas | 3.75% Senior Unsecured Notes | Senior Unsecured Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 50.0 |
Interest Rate |  | 3.75% |
AEPTCo |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 90.0 | 0.0
AEPTCo | Senior Unsecured Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest Rate |  | 5.38% |
AEPTCo | 3.66% Senior Unsecured Notes | Senior Unsecured Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 50.0 |
Interest Rate |  | 3.66% |
AEPTCo | 3.76% Senior Unsecured Notes | Senior Unsecured Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 40.0 |
Interest Rate |  | 3.76% |
APCo |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 498.3 | 413.5
APCo | 13.72% Other Long-term Debt | Other Long-term Debt |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 0.1 |
Interest Rate |  | 13.72% |
APCo | 3.75% Pollution Control Bonds | Pollution Control Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 104.4 |
Interest Rate |  | 3.75% |
APCo | 1.00% Pollution Control Bonds | Pollution Control Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 65.4 |
Interest Rate |  | 1.00% |
APCo | 3.77% Securitization Bonds | Securitization Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 28.4 |
Interest Rate |  | 3.77% |
APCo | 3.40% Senior Unsecured Notes | Senior Unsecured Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 300.0 |
Interest Rate |  | 3.40% |
I&M |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 269.9 | 76.1
I&M | Pollution Control Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Interest Rate |  | 3.70% |
I&M | Notes Payable |  |  |
Debt Instrument [Line Items] |  |  |
Interest Rate |  | 4.89% |
I&M | Notes Payable | Subsequent Event |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid | $ 8.0 |  |
I&M | 0.93% Notes Payable | Notes Payable |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 3.9 |
Interest Rate |  | 0.93% |
I&M | Variable Note Payable | Notes Payable |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 1.1 |
I&M | 3.44% Notes Payable | Notes Payable |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 8.4 |
Interest Rate |  | 3.44% |
I&M | 5.93% Notes Payable | Notes Payable |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 13.2 |
Interest Rate |  | 5.93% |
I&M | 6.41% Notes Payable | Notes Payable |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 24.6 |
Interest Rate |  | 6.41% |
I&M | 6.01% Notes Payable | Notes Payable |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 15.4 |
Interest Rate |  | 6.01% |
I&M | 4.89% Notes Payable | Notes Payable |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 13.1 |
Interest Rate |  | 4.89% |
I&M | 6.00% Other Long-term Debt | Other Long-term Debt |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 0.2 |
Interest Rate |  | 6.00% |
I&M | 3.05% Pollution Control Bonds | Pollution Control Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 100.0 |
Interest Rate |  | 3.05% |
I&M | 2.75% Pollution Control Bonds | Pollution Control Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 50.0 |
Interest Rate |  | 2.75% |
I&M | 0.75% Pollution Control Bonds | Pollution Control Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 40.0 |
Interest Rate |  | 0.75% |
PSO |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 125.4 | 0.4
PSO | Senior Unsecured Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest Rate |  | 5.45% |
PSO | 3.00% Other Long-term Debt | Other Long-term Debt |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 0.4 |
Interest Rate |  | 3.00% |
PSO | 3.17% Senior Unsecured Notes | Senior Unsecured Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 125.0 |
Interest Rate |  | 3.17% |
SWEPCo |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 11.1 | $ 0.0
SWEPCo | 4.88% Securitization Bonds | Securitization Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 11.1 |
Interest Rate |  | 4.88% |
AEGCo | 1.35% Pollution Control Bonds | Pollution Control Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 45.0 |
Interest Rate |  | 1.35% |
KPCo | Securitization Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Interest Rate |  | 5.30% |
KPCo | Variable Other Long-term Debt | Other Long-term Debt |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 150.0 |
Transource Energy | 2.75 % Senior Unsecured Notes | Senior Unsecured Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 2.6 |
Interest Rate |  | 2.75% |
WPCo | 6.89% Notes Payable | Notes Payable |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 15.0 |
Interest Rate |  | 6.89% |
WPCo | 3.70% Senior Unsecured Notes | Senior Unsecured Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount Paid |  | $ 122.0 |
Interest Rate |  | 3.70% |

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