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FINANCING ACTIVITIES - Long-term Debt Subsequent Events (Details) - USD ($) $ in Millions	1 Months Ended	6 Months Ended
	Jul. 30, 2026	Jun. 30, 2026	Jun. 30, 2025
Debt Instrument [Line Items]
Proceeds from issuance of debt		$ 5,088
Repayments of long-term debt		1,578	$ 1,324
SOUTHWESTERN ELECTRIC POWER COMPANY \| Subsequent Event
Debt Instrument [Line Items]
Proceeds from contributed capital	$ 37
INDIANA MICHIGAN POWER COMPANY
Debt Instrument [Line Items]
Repayments of long-term debt		63	$ 240
INDIANA MICHIGAN POWER COMPANY \| Notes Payable \| Subsequent Event
Debt Instrument [Line Items]
Repayments of long-term debt	10
Transource Energy \| Other Long-term Debt
Debt Instrument [Line Items]
Proceeds from issuance of debt		$ 23
Transource Energy \| Other Long-term Debt \| Subsequent Event
Debt Instrument [Line Items]
Proceeds from issuance of debt	$ 9