Rate Matters East Companies (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Public Utilities, General Disclosures [Line Items]
Net Property, Plant and Equipment	$ 74,681.4	$ 73,339.1
AEP Transmission Co [Member]
Public Utilities, General Disclosures [Line Items]
Net Property, Plant and Equipment	14,037.7	13,339.9
Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Net Property, Plant and Equipment	12,674.0	12,379.2
Indiana Michigan Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Net Property, Plant and Equipment	7,482.7	7,411.5
Ohio Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Net Property, Plant and Equipment	9,002.9	$ 8,609.3
ENEC Filing | Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
2021 Requested Increase in ENEC Revenues	73.0
2021 Cumulative ENEC Under Recovery	55.0
2021 Projected ENEC Cost Incease	18.0
2021 Approved ENEC Rate Increase	7.0
2021 Approved Reduction in ENEC Projected Costs	48.0
2022 Requested Increase in ENEC Rates	155.0
2022 Requested Increase in ENEC Rates Second Filing	297.0
2022 Approved Projected ENEC Rate Increase	31.0
2022 Approved Overall ENEC Rate Increase	93.0
2022 Recommended ENEC Under-Recovery Disallowance	83.0
2022 Recommended Increase in ENEC Rates	13.0
2023 Alt One Annual Increase in ENEC	293.0
2023 Alt One Current Year ENEC Increase	89.0
2023 Alt One Under Recovery	200.0
2023 Alt Two Annual Increase in ENEC Rates	89.0
2023 Alt Two Asset Securitization	1,900.0
2023 Alt Two Under Recovery	553.0
2023 Alt Two Major Storm Expense Deferrals	88.0
2023 Alt Two WV Amos and Mountaineer Book Value and CCR and ELG Investments	$ 1,200.0
Opinion Coal Fired Plants Capacity Factor	69.00%
Opinion Recommended Disallowance Factor	52.90%
September 2022 Cumulative ENEC Under Recovery Balance	$ 430.0
Potential Cumulative ENEC Under Recovery Disallowance	285.0
Michigan Power Supply Cost Recovery Reconciliation | Indiana Michigan Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Recommended Disallowance	18.0
Potential Disallowed Costs	14.0
OVEC ICPA Recommended Disallowance	$ 1.0
2020-2022 Virginia Triennial Review [Member] | Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Requested Return on Equity	10.60%
Intervenor Recommended Annual Increase	$ 69.0
Previously Incurred Costs Deferral Below Authorized ROE Band	35.0
Requested Annual Base Rate Increase	213.0
Requested Annual Base Rate Increase Vegetation Management Portion	47.0
Requested annual Base Rate Incresae Depreciation Expense Portion	$ 35.0
Intervenor Recommended Return on Equity	9.20%
Intervenor Recommended Base Rate Decrease Depreciation Expense	$ 36.0
Intervenor Recommended Base Rate Vegetation Management Removal	40.0
Intervenor Recommended Base Rate Storm Cost Removal	23.0
Intervenor Recommended Base Rate Boiler Maintenance Removal	$ 15.0
Ohio ESP Filings [Member] | Ohio Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Proprosed ESP Return on Common Equity	10.65%
Fuel Adjustment Clause Purchased Power Limitation [Member] | Kentucky Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Requested Purchased Power Costs Not Recoverable Through FAC Recovery	$ 12.0
2023 Kentucky Base Rate and Securitization Case [Member] | Kentucky Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Requested Return on Equity	9.90%
Requested Annual Base Rate Increase	$ 94.0
Requested Purchased Power Costs Not Recoverable Through FAC Recovery	16.0
Requested Annual Base Rate Storm Level Restoration Expense	1.0
Requested Securitization Bonds Regulatory Assets Recovery	471.0
Requested Securitization Bonds Plant Recovery Retirement Costs	289.0
Requested Securitization Bonds Deferred Storm Costs	79.0
Requested Securitization Bonds Deferred Purchased Power Expenses	52.0
Requested Securitization Bonds Under-Recovered Purchased Power Rider Costs	$ 51.0