Rate Matters East Companies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021		Dec. 31, 2020
Public Utilities, General Disclosures [Line Items]
Total Property, Plant and Equipment, Net	$ 66,001.3	[1]	$ 63,901.6
Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Total Property, Plant and Equipment, Net	11,804.3		11,394.1
Indiana Michigan Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Total Property, Plant and Equipment, Net	7,310.9		7,052.3
Ohio Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Total Property, Plant and Equipment, Net	$ 7,963.0		$ 7,452.1
Wheeling Power Company | Mitchell Power Plant
Public Utilities, General Disclosures [Line Items]
Ownership Interest in Mitchell Power Plant	50.00%
Kentucky Power Co [Member] | 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]
Total Basis Point Band for Authorized Return on Equity	140.00%
Approved Return on Common Equity	9.20%
2020 Ohio Base Rate Case [Member] | Ohio Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Requested Annual Increase	$ 42.0
Requested Return on Equity	10.15%
Approved Return on Common Equity	9.70%
Approved Annual Revenue Cap for the DIR in 2021	$ 57.0
Approved Annual Revenue Cap for the DIR in 2022	91.0
Approved Annual Revenue Cap for the DIR in 2023	116.0
Approved Annual Revenue Cap for the DIR for the first five months of 2024	51.0
Approved Annual Revenue Decrease	68.0
CCR/ELG Filings | Mitchell Power Plant
Public Utilities, General Disclosures [Line Items]
Estimated CCR/ELG Costs	132.0
Estimated alternative CCR Investment	25.0
CCR/ELG Filings | Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Estimated ELG Costs	197.0
Net Book Value of Amos and Mountaineer Plants - Virginia	1,500.0
Estimated ELG Investment	26.0
CCR/ELG Filings | Kentucky Power Co [Member] | Mitchell Power Plant
Public Utilities, General Disclosures [Line Items]
Estimated ELG Investment	3.0
Property, Plant and Equipment, Net	586.0
2021 Indiana Base Rate Case | Indiana Michigan Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Requested Annual Increase	$ 104.0
Requested Return on Equity	10.00%
Phased In Annual Increase 2022	$ 73.0
Phased in Annual Increase 2023	31.0
Amount of Increase Related to Annual Depreciation Expense	7.0
Proposed Settlement Annual Rate Increase	$ 61.0
Proposed Settlement Agreement ROE	9.70%
Approved Annual Increase in 2022	$ 3.0
Approved Annual Increase in 2023	$ 58.0
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%

[1] Amount excludes $2.3 billion and $165 million for AEP and AEPTCo, respectively, of Property, Plant and Equipment - Net classified as Assets Held for Sale on the balance sheet. See “Disposition of KPCo and KTCo” section of Note 7 for additional information.