Rate Matters East Companies (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Oct. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Public Utilities, General Disclosures [Line Items]
Net Property, Plant and Equipment		$ 75,821.1	$ 73,339.1
AEP Transmission Co [Member]
Public Utilities, General Disclosures [Line Items]
Net Property, Plant and Equipment		14,318.9	13,339.9
Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Net Property, Plant and Equipment		12,825.1	12,379.2
Indiana Michigan Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Net Property, Plant and Equipment		7,535.7	7,411.5
Ohio Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Net Property, Plant and Equipment		9,160.0	$ 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
2023 Staff and Intervenor Recommended Under Recovery		262.0
2023 Approved Annual Increase in ENEC Rates		$ 89.0
2023 Intervenor Recommended Share of OSS Revenues with Customers		75.00%
ENEC Filing | Appalachian Power Co [Member] | Subsequent Event [Member]
Public Utilities, General Disclosures [Line Items]
2023 Intervenor Recommended Under Recovery Disallowance	$ 553.0
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%
Staff and Intervenor Recommended Annual Increase		$ 127.0
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
Staff and Intervenor Recommended Return on Equity		9.50%
Staff and Intervenor Recommended Storm Costs Regulatory Asset		$ 50.0
Ohio ESP Filings [Member] | Ohio Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Approved Return on Common Equity		9.70%
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
2023 Kentucky Base Rate and Securitization Case [Member] | Kentucky Power Co [Member] | Subsequent Event [Member]
Public Utilities, General Disclosures [Line Items]
Intervenor Recommended Annual Increase	63.0
Intervenor Recommended Opposition to Tax Related Regulatory Asset	33.0
Intervenor Recommended Opposition to Purchased Power Recovery	16.0
Intervenor Recommended Opposition to Return on Retirement Costs	$ 42.0
2023 Indiana Base Rate Case [Member] | Indiana Michigan Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Requested Annual Increase		$ 116.0
Requested Return on Equity		10.50%
Amount of Increase Related to Annual Depreciation Expense		$ 41.0
Requested Deferred Storm Costs		$ 15.0
Requested Debt Capital Structure		48.80%
Requested Equity Capital Structure		51.20%
2023 Michigan Base Rate Case [Member] | Indiana Michigan Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Requested Annual Increase		$ 34.0
Requested Return on Equity		10.50%
Amount of Increase Related to Annual Depreciation Expense		$ 11.0
Requested Debt Capital Structure		49.40%
Requested Equity Capital Structure		50.60%
Minimum [Member] | ENEC Filing | Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
2023 Staff and Intervenor Recommended Carrying Charges		2.00%
Minimum [Member] | 2023 Kentucky Base Rate and Securitization Case [Member] | Kentucky Power Co [Member] | Subsequent Event [Member]
Public Utilities, General Disclosures [Line Items]
Intervenor Recommended Return on Equity	9.30%
Maximum [Member] | ENEC Filing | Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
2023 Staff and Intervenor Recommended Carrying Charges		4.00%
Maximum [Member] | 2023 Kentucky Base Rate and Securitization Case [Member] | Kentucky Power Co [Member] | Subsequent Event [Member]
Public Utilities, General Disclosures [Line Items]
Intervenor Recommended Return on Equity	9.70%