v3.25.2
VOLUNTARY SEVERANCE PROGRAM - 2024 Voluntary Severance Program (Details)
$ in Millions
 3 Months Ended
Jun. 30, 2024
USD ($)
Restructuring Cost and Reserve [Line Items]  
Severance Expense Incurred $ 122.0
AEP Texas  
Restructuring Cost and Reserve [Line Items]  
Severance Expense Incurred 19.8
AEPTCo  
Restructuring Cost and Reserve [Line Items]  
Severance Expense Incurred 10.7
APCo  
Restructuring Cost and Reserve [Line Items]  
Severance Expense Incurred 26.5
I&M  
Restructuring Cost and Reserve [Line Items]  
Severance Expense Incurred 14.8
OPCo  
Restructuring Cost and Reserve [Line Items]  
Severance Expense Incurred 14.8
PSO  
Restructuring Cost and Reserve [Line Items]  
Severance Expense Incurred 10.1
SWEPCo  
Restructuring Cost and Reserve [Line Items]  
Severance Expense Incurred $ 16.9