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ACQUISITIONS AND DISPOSITIONS - Narrative (Details) $ in Millions |  | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2025 USD ($) facility | Jun. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Feb. 29, 2024 USD ($) | Sep. 30, 2025 USD ($) facility | Sep. 30, 2024 USD ($) | Aug. 31, 2025 | May 31, 2025
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from noncontrolling interests, net |  |  |  |  | $ 2,782.9 | $ 0.0 |  |
AEP OnSite Partners | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from divestiture of businesses |  |  | $ 318.0 |  |  |  |  |
NMRD | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from divestiture of businesses |  |  |  | $ 107.0 |  |  |  |
Ohio Transmission And Indiana Michigan Transmission |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Subsidiary, ownership percentage, parent |  | 19.90% |  |  |  |  |  |
Proceeds from noncontrolling interests, gross |  | $ 2,820.0 |  |  |  |  |  |
Proceeds from noncontrolling interests, net |  | $ 2,780.0 |  |  |  |  |  |
VIU | Pixley | PSO |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Percentage of shares acquired |  |  |  |  |  |  |  | 100.00%
VIU | Flat Ridge IV | PSO |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Percentage of shares acquired |  | 100.00% |  |  |  |  |  |
VIU | Green Country | PSO |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Percentage of shares acquired |  | 100.00% |  |  |  |  |  |
Asset acquisition, property, plant and equipment |  | $ 819.0 |  |  |  |  |  |
Asset acquisition, intangible liability |  | 41.0 |  |  |  |  |  |
Asset acquisition, regulatory liability |  | $ 50.0 |  |  |  |  |  |
VIU | Wind Energy, LLC | PSO |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Percentage of shares acquired |  |  |  |  |  |  | 100.00% |
VIU | Four Electric Generation Facilities | PSO |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of properties | facility | 4 |  |  |  | 4 |  |  |
Payments to acquire plant | $ 1,700.0 |  |  |  |  |  |  |

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