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VARIABLE INTEREST ENTITIES AND EQUITY METHOD INVESTMENTS - Power Purchased (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
APPALACHIAN POWER COMPANY |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Amount of power purchased from OVEC | $ 133.6 | $ 121.8 | $ 119.3
INDIANA MICHIGAN POWER COMPANY |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Amount of power purchased from OVEC | 66.8 | 60.9 | 59.7
OHIO POWER COMPANY |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Amount of power purchased from OVEC | $ 169.7 | $ 154.7 | $ 151.8

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- Definition Amount of power purchased by the Registrant Subsidiaries from OVEC. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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- Details
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- Details
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