v3.25.2
BENEFIT PLANS - Qualified Pension Contribution (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Defined Benefit Plan Disclosure [Line Items]    
Qualified pension contribution $ 94.7 $ 0.0
AEP Texas    
Defined Benefit Plan Disclosure [Line Items]    
Qualified pension contribution 12.0 0.0
APCo    
Defined Benefit Plan Disclosure [Line Items]    
Qualified pension contribution 0.4  
I&M    
Defined Benefit Plan Disclosure [Line Items]    
Qualified pension contribution 2.1  
PSO    
Defined Benefit Plan Disclosure [Line Items]    
Qualified pension contribution 1.4  
SWEPCo    
Defined Benefit Plan Disclosure [Line Items]    
Qualified pension contribution $ 8.8 $ 0.0