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BENEFIT PLANS - Qualified Pension Contribution (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items]
Pension to qualified plan trust	$ 94.7	$ 0.0
AEP Texas
Defined Benefit Plan Disclosure [Line Items]
Pension to qualified plan trust	12.0	$ 0.0
APCo
Defined Benefit Plan Disclosure [Line Items]
Pension to qualified plan trust	0.4
I&M
Defined Benefit Plan Disclosure [Line Items]
Pension to qualified plan trust	2.1
PSO
Defined Benefit Plan Disclosure [Line Items]
Pension to qualified plan trust	1.4
SWEPCo
Defined Benefit Plan Disclosure [Line Items]
Pension to qualified plan trust	$ 8.8

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