RATE MATTERS - 2025 Ohio Base Rate Case (Details) - 2025 Ohio Base Rate Case - OHIO POWER COMPANY - USD ($) $ in Millions	1 Months Ended
	Jan. 31, 2026	May 31, 2025
Public Utilities, General Disclosures [Line Items]
Requested annual base rate increase (decrease)		$ 97
Requested return on equity	9.84%	10.90%
Requested debt capital structure	49.10%	49.10%
Requested equity capital structure	50.90%	50.90%
Settlement agreement annual increase	$ 11
Public utilities, net annual revenue settlement of amortization	$ 82
Public utilities, net annual revenue settlement of amortization period	18 months
Public utilities, net annual revenue decrease	$ 59