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FINANCING ACTIVITIES - Schedule of Long-Term Debt Information (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Instrument [Line Items] |  |
Total Long-term Debt Outstanding | $ 42,642.8 | $ 40,143.2
AEP TEXAS INC. |  |
Debt Instrument [Line Items] |  |
Total Long-term Debt Outstanding | 6,441.6 | 5,889.8
AEP TRANSMISSION COMPANY, LLC |  |
Debt Instrument [Line Items] |  |
Total Long-term Debt Outstanding | 5,768.1 | 5,414.4
APPALACHIAN POWER COMPANY |  |
Debt Instrument [Line Items] |  |
Total Long-term Debt Outstanding | 5,660.3 | 5,588.3
INDIANA MICHIGAN POWER COMPANY |  |
Debt Instrument [Line Items] |  |
Total Long-term Debt Outstanding | 3,494.3 | 3,499.4
OHIO POWER COMPANY |  |
Debt Instrument [Line Items] |  |
Total Long-term Debt Outstanding | 3,715.7 | 3,366.8
PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Debt Instrument [Line Items] |  |
Total Long-term Debt Outstanding | 2,855.6 | 2,384.6
SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Debt Instrument [Line Items] |  |
Total Long-term Debt Outstanding | $ 3,980.8 | 3,646.9
Senior Unsecured Notes |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 4.32% |
Senior Unsecured Notes | $ 36,410.9 | $ 33,779.4
Senior Unsecured Notes | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.00% | 1.00%
Senior Unsecured Notes | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 8.13% | 8.13%
Senior Unsecured Notes | AEP TEXAS INC. |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 4.39% |
Senior Unsecured Notes | $ 5,873.8 | $ 5,027.2
Senior Unsecured Notes | AEP TEXAS INC. | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.10% | 2.10%
Senior Unsecured Notes | AEP TEXAS INC. | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 6.76% | 6.76%
Senior Unsecured Notes | AEP TRANSMISSION COMPANY, LLC |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 4.12% |
Senior Unsecured Notes | $ 5,768.1 | $ 5,414.4
Senior Unsecured Notes | AEP TRANSMISSION COMPANY, LLC | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.75% | 2.75%
Senior Unsecured Notes | AEP TRANSMISSION COMPANY, LLC | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 5.52% | 5.52%
Senior Unsecured Notes | APPALACHIAN POWER COMPANY |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 4.75% |
Senior Unsecured Notes | $ 4,984.1 | $ 4,584.9
Senior Unsecured Notes | APPALACHIAN POWER COMPANY | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.70% | 2.70%
Senior Unsecured Notes | APPALACHIAN POWER COMPANY | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 7.00% | 7.00%
Senior Unsecured Notes | INDIANA MICHIGAN POWER COMPANY |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 4.52% |
Senior Unsecured Notes | $ 2,845.2 | $ 2,843.6
Senior Unsecured Notes | INDIANA MICHIGAN POWER COMPANY | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.25% | 3.25%
Senior Unsecured Notes | INDIANA MICHIGAN POWER COMPANY | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 6.05% | 6.05%
Senior Unsecured Notes | OHIO POWER COMPANY |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 4.16% |
Senior Unsecured Notes | $ 3,715.7 | $ 3,366.8
Senior Unsecured Notes | OHIO POWER COMPANY | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.63% | 1.63%
Senior Unsecured Notes | OHIO POWER COMPANY | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 6.60% | 6.60%
Senior Unsecured Notes | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 4.29% |
Senior Unsecured Notes | $ 2,854.2 | $ 2,257.8
Senior Unsecured Notes | PUBLIC SERVICE COMPANY OF OKLAHOMA | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.20% | 2.20%
Senior Unsecured Notes | PUBLIC SERVICE COMPANY OF OKLAHOMA | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 6.63% | 6.63%
Senior Unsecured Notes | SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 3.73% |
Senior Unsecured Notes | $ 3,649.4 | $ 3,646.9
Senior Unsecured Notes | SOUTHWESTERN ELECTRIC POWER COMPANY | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.65% | 1.65%
Senior Unsecured Notes | SOUTHWESTERN ELECTRIC POWER COMPANY | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 6.20% | 6.20%
Pollution Control Bonds |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 3.26% |
Pollution Control Bonds | $ 1,771.3 | $ 1,771.6
Pollution Control Bonds | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 0.63% | 0.63%
Pollution Control Bonds | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.70% | 4.90%
Pollution Control Bonds | AEP TEXAS INC. |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 3.88% |
Pollution Control Bonds | $ 440.3 | $ 440.3
Pollution Control Bonds | AEP TEXAS INC. | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.60% | 2.60%
Pollution Control Bonds | AEP TEXAS INC. | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.55% | 4.55%
Pollution Control Bonds | APPALACHIAN POWER COMPANY |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 2.95% |
Pollution Control Bonds | $ 429.9 | $ 430.0
Pollution Control Bonds | APPALACHIAN POWER COMPANY | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 0.63% | 0.63%
Pollution Control Bonds | APPALACHIAN POWER COMPANY | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.22% | 4.90%
Pollution Control Bonds | INDIANA MICHIGAN POWER COMPANY |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 2.49% |
Pollution Control Bonds | $ 189.9 | $ 189.4
Pollution Control Bonds | INDIANA MICHIGAN POWER COMPANY | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 0.75% | 0.75%
Pollution Control Bonds | INDIANA MICHIGAN POWER COMPANY | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.05% | 3.05%
Notes Payable - Nonaffiliated |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 6.49% |
Notes Payable - Nonaffiliated | $ 609.9 | $ 193.3
Notes Payable - Nonaffiliated | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 0.93% | 0.93%
Notes Payable - Nonaffiliated | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 6.89% | 6.59%
Notes Payable - Nonaffiliated | INDIANA MICHIGAN POWER COMPANY |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 5.78% |
Notes Payable - Nonaffiliated | $ 142.7 | $ 163.3
Notes Payable - Nonaffiliated | INDIANA MICHIGAN POWER COMPANY | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 0.93% | 0.93%
Notes Payable - Nonaffiliated | INDIANA MICHIGAN POWER COMPANY | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 6.41% | 6.59%
Securitization Bonds |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 4.08% |
Securitization Bonds | $ 578.0 | $ 368.9
Securitization Bonds | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.06% | 2.06%
Securitization Bonds | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.88% | 3.77%
Securitization Bonds | AEP TEXAS INC. |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 2.27% |
Securitization Bonds | $ 126.8 | $ 221.8
Securitization Bonds | AEP TEXAS INC. | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.06% | 2.06%
Securitization Bonds | AEP TEXAS INC. | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.29% | 2.84%
Securitization Bonds | APPALACHIAN POWER COMPANY |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 3.77% |
Interest Rate | 3.77% | 3.77%
Securitization Bonds | $ 119.8 | $ 147.0
Securitization Bonds | SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 4.88% |
Interest Rate | 4.88% | 0.00%
Securitization Bonds | $ 331.4 | $ 0.0
Junior Subordinated Notes |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 5.67% |
Junior Subordinated Notes | $ 2,579.1 | $ 2,388.1
Junior Subordinated Notes | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.88% | 2.03%
Junior Subordinated Notes | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 7.05% | 5.70%
Spent Nuclear Fuel Obligation |  |
Debt Instrument [Line Items] |  |
Spent Nuclear Fuel Obligation | $ 316.3 | $ 300.4
Spent Nuclear Fuel Obligation | INDIANA MICHIGAN POWER COMPANY |  |
Debt Instrument [Line Items] |  |
Spent Nuclear Fuel Obligation | $ 316.3 | 300.4
Other Long-term Debt |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 5.60% |
Other Long-term Debt | $ 377.3 | $ 1,341.5
Other Long-term Debt | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.00% | 3.00%
Other Long-term Debt | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 13.72% | 13.72%
Other Long-term Debt | AEP TEXAS INC. |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 4.50% |
Interest Rate | 4.50% |
Other Long-term Debt | $ 0.7 | $ 200.5
Other Long-term Debt | AEP TEXAS INC. | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate |  | 4.50%
Other Long-term Debt | AEP TEXAS INC. | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate |  | 6.71%
Other Long-term Debt | APPALACHIAN POWER COMPANY |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 5.84% |
Other Long-term Debt | $ 126.5 | $ 426.4
Other Long-term Debt | APPALACHIAN POWER COMPANY | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 5.75% | 6.46%
Other Long-term Debt | APPALACHIAN POWER COMPANY | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 13.72% | 13.72%
Other Long-term Debt | INDIANA MICHIGAN POWER COMPANY |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 6.00% |
Interest Rate | 6.00% | 6.00%
Other Long-term Debt | $ 0.2 | $ 2.7
Other Long-term Debt | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate | 3.00% |
Interest Rate | 3.00% |
Other Long-term Debt | $ 1.4 | $ 126.8
Other Long-term Debt | PUBLIC SERVICE COMPANY OF OKLAHOMA | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate |  | 3.00%
Other Long-term Debt | PUBLIC SERVICE COMPANY OF OKLAHOMA | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate |  | 6.71%

X
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