RATE MATTERS - FERC Rate Matters (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Oct. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Oct. 31, 2022
Independence Energy Connection Project
Public Utilities, General Disclosures [Line Items]
Aep share of independence energy connection capital costs		$ 96.0
Request to Update AEGCo Depreciation Rates
Public Utilities, General Disclosures [Line Items]
Proposed revision, deprecation rates, ownership interests						50.00%
FERC 2021 PJM and SPP Transmission Formula Rate Challenge
Public Utilities, General Disclosures [Line Items]
Stand alone treatment of nolcs annual revenue increase		$ 52.0	$ 61.0	$ 69.0	$ 78.0
Request to Update SWEPCo Generation Depreciation Rates
Public Utilities, General Disclosures [Line Items]
Requested annual revenue requirement	$ 5.0