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COMMITMENTS, GUARANTEES AND CONTINGENCIES - ARO CCR Rule (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Other Commitments [Line Items] |  |  |  |
Increase in ARO | $ 3,611.7 |  | $ 3,031.2 | $ 2,943.6
CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | $ 674.4 |  |
Increase in Generation Property | CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | 176.9 |  |
Increase in Regulatory Assets | CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | 355.0 |  |
Charged to Operating Expenses | CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | 142.5 |  |
APPALACHIAN POWER COMPANY |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO | 801.7 |  | 464.0 | 427.7
APPALACHIAN POWER COMPANY | CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | 312.2 |  |
APPALACHIAN POWER COMPANY | Increase in Generation Property | CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | 75.6 |  |
APPALACHIAN POWER COMPANY | Increase in Regulatory Assets | CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | 236.6 |  |
APPALACHIAN POWER COMPANY | Charged to Operating Expenses | CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | 0.0 |  |
INDIANA MICHIGAN POWER COMPANY |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO | 2,093.8 |  | 2,106.0 | 2,028.1
INDIANA MICHIGAN POWER COMPANY | CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | 85.7 |  |
INDIANA MICHIGAN POWER COMPANY | Increase in Generation Property | CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | 0.0 |  |
INDIANA MICHIGAN POWER COMPANY | Increase in Regulatory Assets | CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | 72.3 |  |
INDIANA MICHIGAN POWER COMPANY | Charged to Operating Expenses | CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | 13.4 |  |
OHIO POWER COMPANY |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO | 56.3 |  | 2.1 | 5.0
OHIO POWER COMPANY | CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | 52.9 |  |
OHIO POWER COMPANY | Increase in Generation Property | CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | 0.0 |  |
OHIO POWER COMPANY | Increase in Regulatory Assets | CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | 0.0 |  |
OHIO POWER COMPANY | Charged to Operating Expenses | CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | 52.9 |  |
PUBLIC SERVICE COMPANY OF OKLAHOMA |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO | 121.8 |  | 84.2 | 75.7
PUBLIC SERVICE COMPANY OF OKLAHOMA | CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | 33.7 |  |
PUBLIC SERVICE COMPANY OF OKLAHOMA | Increase in Generation Property | CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | 33.7 |  |
PUBLIC SERVICE COMPANY OF OKLAHOMA | Increase in Regulatory Assets | CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | 0.0 |  |
PUBLIC SERVICE COMPANY OF OKLAHOMA | Charged to Operating Expenses | CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | 0.0 |  |
SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO | $ 278.7 |  | $ 281.6 | $ 280.9
SOUTHWESTERN ELECTRIC POWER COMPANY | CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | 23.8 |  |
SOUTHWESTERN ELECTRIC POWER COMPANY | Increase in Generation Property | CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | 23.8 |  |
SOUTHWESTERN ELECTRIC POWER COMPANY | Increase in Regulatory Assets | CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | 0.0 |  |
SOUTHWESTERN ELECTRIC POWER COMPANY | Charged to Operating Expenses | CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | 0.0 |  |
Non Registrant | CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | 166.1 |  |
Non Registrant | Increase in Generation Property | CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | 43.8 |  |
Non Registrant | Increase in Regulatory Assets | CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | 46.1 |  |
Non Registrant | Charged to Operating Expenses | CCR Rule Revision |  |  |  |
Other Commitments [Line Items] |  |  |  |
Increase in ARO |  | $ 76.2 |  |

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