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RELATED PARTY TRANSACTIONS - Narrative (Details) | 5 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2024 USD ($) state company | Dec. 31, 2024 USD ($) state company | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Aug. 31, 2023
Related Party Transaction [Line Items] |  |  |  |  |
Number of states within service area | state | 11 | 11 |  |  |
G&M | Fowler Ridge 2 |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Ownership percentage |  |  |  |  | 50.00%
Related Party |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Purchases from related party |  | $ 100,000 |  |  |
Power Coordination Agreement |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Number of member companies allocated for power and natural gas risk management activities | company | 4 | 4 |  |  |
Joint License Agreement | AEP TRANSMISSION COMPANY, LLC |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, agreement term |  | 50 years |  |  |
Related party transaction, agreement term with counterparty |  | 5 years |  |  |
Related party transaction, agreement, expiration, auto-renew period |  | 1 year |  |  |
Direct Purchases from AEGCo | INDIANA MICHIGAN POWER COMPANY |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Purchases from related party |  | $ 209,000,000 | $ 181,000,000 | $ 242,000,000 |
Ohio Auction SSO Load Delivery Purchases from Affiliates | OHIO POWER COMPANY |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Purchases from related party |  | 98,000,000 | 87,000,000 | 10,000,000 |
Clean Affordable Reliable Coalition (CARE) |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, amount |  | $ 0 | $ 100,000 | $ 200,000 |
Vendor Purchases |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, amount | $ 44,000,000 |  |  |  |
Vendor Purchases | AEP TEXAS INC. |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, amount | 25,000,000 |  |  |  |
Vendor Purchases | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, amount | $ 13,000,000 |  |  |  |
Transmission Revenues | Related Party |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Costs allocation, average period |  | 12 months |  |  |

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