Rate Matters East Companies (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Public Utilities, General Disclosures [Line Items]
Property, Plant and Equipment, Net	$ 69,813.1	$ 66,001.3
AEP Transmission Co [Member]
Public Utilities, General Disclosures [Line Items]
Property, Plant and Equipment, Net	12,742.6	11,935.7
Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Property, Plant and Equipment, Net	12,163.6	11,804.3
Indiana Michigan Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Property, Plant and Equipment, Net	7,389.4	7,310.9
Ohio Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Property, Plant and Equipment, Net	$ 8,396.0	$ 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%
Proposed Previously Incurred Costs Expected to Recover	$ 37.0
Requested Annual Base Rate Increase	41.0
Requested Rider to Recover October 2022 thru January 2024	72.0
Costs Below Authorized ROE Band in Base Rate Increase Request	12.0
Expensed Remaining Closed Coal Plant	25.0
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	62.0
Net Book Value of Amos and Mountaineer Plants - Virginia	1,500.0
Estimated ELG Costs	162.0
CCR/ELG Filings | Kentucky Power Co [Member] | Mitchell Power Plant
Public Utilities, General Disclosures [Line Items]
Property, Plant and Equipment, Net	576.0
Indiana Earnings Test Filings | Indiana Michigan Power Co [Member]
Public Utilities, General Disclosures [Line Items]
FAC Credit to Customers	14.0
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	430.0
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
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] | West Virginia
Public Utilities, General Disclosures [Line Items]
Storm Expenses to be Requested in Separate Filing	15.0
June 2022 Storm Costs | Ohio Power Co [Member] | Ohio
Public Utilities, General Disclosures [Line Items]
Storm Expenses to be Requested in Separate Filing	19.0
2022 Michigan Integrated Resource Plan Filing | Indiana Michigan Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Rockport U2 Leasehold Improvements Net Book Value	102.0
2020-2022 Virginia Triennial Review [Member] | Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Previously Incurred Costs Deferral Below Authorized ROE Band	$ 25.0
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%