v3.25.2
FINANCING ACTIVITIES - Schedule of Fees Paid to AEP Credit for Customer Accounts Receivable Sold (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers $ 5,055.4 $ 4,657.6 $ 10,470.5 $ 9,742.6
APCo        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 940.2 916.7 2,106.5 2,009.7
I&M        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 724.0 589.9 1,479.0 1,283.7
OPCo        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 904.6 887.0 1,898.1 1,900.3
PSO        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 467.6 460.2 861.6 848.2
SWEPCo        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 562.3 399.8 1,092.7 916.1
Servicing Contracts | APCo        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 3.3 3.9 7.2 8.1
Servicing Contracts | I&M        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 3.5 3.8 7.0 7.9
Servicing Contracts | OPCo        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 7.5 7.4 14.9 14.8
Servicing Contracts | PSO        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 2.8 3.4 5.7 6.8
Servicing Contracts | SWEPCo        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers $ 3.7 $ 4.3 $ 7.8 $ 9.1