Rate Matters East Companies (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Public Utilities, General Disclosures [Line Items]
Property, Plant and Equipment, Net	$ 68,708.2	$ 66,001.3
AEP Transmission Co [Member]
Public Utilities, General Disclosures [Line Items]
Property, Plant and Equipment, Net	12,449.2	11,935.7
Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Property, Plant and Equipment, Net	11,988.3	11,804.3
Indiana Michigan Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Property, Plant and Equipment, Net	7,349.4	7,310.9
Ohio Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Property, Plant and Equipment, Net	$ 8,214.8	$ 7,963.0
Kentucky Power Co [Member] | Mitchell Power Plant
Public Utilities, General Disclosures [Line Items]
Ownership Interest in Mitchell Power Plant	50.00%
Wheeling Power Company | Mitchell Power Plant
Public Utilities, General Disclosures [Line Items]
Ownership Interest in Mitchell Power Plant	50.00%
2017-2019 Virginia Triennial Review [Member] | Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Approved Return on Common Equity	9.20%
Total Basis Point Band for Authorized Return on Equity	14000.00%
CCR/ELG Filings | Mitchell Power Plant
Public Utilities, General Disclosures [Line Items]
Investment in CCR/ELG	$ 132.0
Estimated alternative CCR Investment	25.0
CCR/ELG Filings | Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
ELG Investment	56.0
Net Book Value of Amos and Mountaineer Plants - Virginia	1,500.0
Estimated ELG Costs	197.0
CCR/ELG Filings | Kentucky Power Co [Member] | Mitchell Power Plant
Public Utilities, General Disclosures [Line Items]
Property, Plant and Equipment, Net	584.0
2021 and 2021 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
Current Cumulative ENEC Under Recovery	375.0
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
Michigan Power Supply Cost Recovery Reconciliation | Indiana Michigan Power Co [Member]
Public Utilities, General Disclosures [Line Items]
ALJ Recommended Disallowance	8.0
June 2022 Storm Costs | Appalachian Power Co [Member] | Virginia
Public Utilities, General Disclosures [Line Items]
Storm Expenses to be Requested in Separate Filing	7.0
June 2022 Storm Costs | Appalachian Power Co [Member] | West Virginia
Public Utilities, General Disclosures [Line Items]
Storm Expenses to be Requested in Separate Filing	17.0
June 2022 Storm Costs | Ohio Power Co [Member] | Ohio
Public Utilities, General Disclosures [Line Items]
Storm Expenses to be Requested in Separate Filing	$ 14.0
Minimum [Member] | 2017-2019 Virginia Triennial Review [Member] | Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Approved Return on Common Equity	8.50%
Maximum [Member] | 2017-2019 Virginia Triennial Review [Member] | Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Approved Return on Common Equity	9.90%