ACQUISITIONS AND IMPAIRMENTS - Impact of Asset Acquisitions (Details) MW in Millions, $ in Millions	1 Months Ended
	Mar. 31, 2026 USD ($) MW	Dec. 31, 2025 USD ($)
Asset Acquisition, Contingent Consideration [Line Items]
Property, Plant and Equipment, Net	$ 94,854	$ 92,374
INDIANA MICHIGAN POWER COMPANY
Asset Acquisition, Contingent Consideration [Line Items]
Property, Plant and Equipment, Net	$ 8,915	$ 7,944
Oregon Clean Energy Center | INDIANA MICHIGAN POWER COMPANY
Asset Acquisition, Contingent Consideration [Line Items]
Net Maximum Capacity | MW	870
Property, Plant and Equipment, Net	$ 918
Prepayments & Other Current Assets	35
Materials & Supplies	5
Accounts Receivable	16
Accounts Payables	$ 9