FAIR VALUE MEASUREMENTS - Fixed Income Securities Held in Nuclear Trusts (Details) - Spent Nuclear Fuel and Decommissioning Trusts $ in Millions	Dec. 31, 2024 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Within 1 year	$ 376.4
After 1 year through 5 years	598.8
After 5 years through 10 years	236.2
After 10 years	322.7
Total	1,534.1
INDIANA MICHIGAN POWER COMPANY
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Within 1 year	376.4
After 1 year through 5 years	598.8
After 5 years through 10 years	236.2
After 10 years	322.7
Total	$ 1,534.1

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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