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FAIR VALUE MEASUREMENTS - Narrative (Details) - Spent Nuclear Fuel and Decommissioning Trusts - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Adjusted cost of debt securities | $ 1,500 | $ 1,400
Adjusted cost of equity securities | 549 | 568
INDIANA MICHIGAN POWER COMPANY |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Adjusted cost of debt securities | 1,500 | 1,400
Adjusted cost of equity securities | $ 549 | $ 568

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