Voluntary Severance Program (Details) $ in Millions	3 Months Ended
	Jun. 30, 2024 USD ($)
Employees Participating in Voluntary Severance Program	1,000
Severance Costs	$ 122.0
Number of Eligible Employees	7,400
Total Number of Employees	16,800
AEP Texas Inc. [Member]
Severance Costs	$ 19.8
AEP Transmission Co [Member]
Severance Costs	10.7
Appalachian Power Co [Member]
Severance Costs	26.5
Indiana Michigan Power Co [Member]
Severance Costs	14.8
Ohio Power Co [Member]
Severance Costs	14.8
Public Service Co Of Oklahoma [Member]
Severance Costs	10.1
Southwestern Electric Power Co [Member]
Severance Costs	$ 16.9