RATE MATTERS - I&M Rate Matters (Details) - INDIANA MICHIGAN POWER COMPANY - USD ($) $ in Thousands	1 Months Ended
	Oct. 31, 2025	Apr. 30, 2026	Feb. 28, 2026
Public Utilities, General Disclosures [Line Items]
Earning test, over-earning credit to customers, proposed			$ 53,000
Subsequent Event
Public Utilities, General Disclosures [Line Items]
Earning test, over-earning credit to customers, approved		$ 53,000
2024 Michigan Power Supply Cost Recovery | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Recommended cost disallowance		$ 2,000
2024 Michigan Power Supply Cost Recovery | Minimum
Public Utilities, General Disclosures [Line Items]
Public utilities, recommended disallowance purchased power	$ 259
2024 Michigan Power Supply Cost Recovery | Maximum
Public Utilities, General Disclosures [Line Items]
Public utilities, recommended disallowance purchased power	$ 14,000