Voluntary Severance Program (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Sep. 30, 2024 USD ($)
Employees Participating in Voluntary Severance Program		1,000
Severance Costs		$ 122.0
Severance Settlement	$ 111.0
Remaining Balance of Severance Costs	11.0		$ 11.0
Number of Eligible Employees		7,400
Total Number of Employees		16,800
Minimum Net Actuarial Loss [Member]
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)			75.0
Settlement Threshold [Member]
Defined Benefit Plan, Benefit Obligation	306.0		306.0
Maximum Net Actuarial Loss [Member]
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)			100.0
AEP Texas Inc. [Member]
Severance Costs		$ 19.8
Severance Settlement	19.5
Remaining Balance of Severance Costs	0.3		0.3
AEP Transmission Co [Member]
Severance Costs		10.7
Severance Settlement	10.7
Remaining Balance of Severance Costs	0.0		0.0
Appalachian Power Co [Member]
Severance Costs		26.5
Severance Settlement	24.7
Remaining Balance of Severance Costs	1.8		1.8
Indiana Michigan Power Co [Member]
Severance Costs		14.8
Severance Settlement	14.3
Remaining Balance of Severance Costs	0.5		0.5
Ohio Power Co [Member]
Severance Costs		14.8
Severance Settlement	14.4
Remaining Balance of Severance Costs	0.4		0.4
Public Service Co Of Oklahoma [Member]
Severance Costs		10.1
Severance Settlement	9.8
Remaining Balance of Severance Costs	0.3		0.3
Southwestern Electric Power Co [Member]
Severance Costs		$ 16.9
Severance Settlement	15.9
Remaining Balance of Severance Costs	$ 1.0		$ 1.0