Rate Matters East Companies (Details) $ in Millions		1 Months Ended	9 Months Ended
	Nov. 06, 2024 USD ($)	Oct. 31, 2024 USD ($)	Sep. 30, 2024 USD ($) Customers	Nov. 01, 2024 USD ($)	Dec. 31, 2023 USD ($)
Public Utilities, General Disclosures [Line Items]
Net Property, Plant and Equipment			$ 80,073.8		$ 76,693.4
AEP Transmission Co [Member]
Public Utilities, General Disclosures [Line Items]
Net Property, Plant and Equipment			15,399.6		14,497.7
Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Net Property, Plant and Equipment			13,404.8		12,931.5
Indiana Michigan Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Net Property, Plant and Equipment			7,773.0		7,629.0
Ohio Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Net Property, Plant and Equipment			$ 9,779.0		$ 9,299.9
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%
2023 Kentucky Base Rate and Securitization Case [Member] | Kentucky Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Requested Return on Equity			9.90%
Approved Return on Common Equity			9.75%
Requested Annual Base Rate Increase			$ 94.0
Requested Securitization Bonds Regulatory Assets Recovery			$ 471.0
KPCo Interest in Mitchell Plant			50.00%
Settlement Agreement Return on Common Equity			9.75%
Settlement Agreement Annual Increase			$ 75.0
Settlement Agreement Securitization Bonds Regulatory Assets Recovery			471.0
Approved Net Increase in Kentucky Annual Revenues			60.0
Reduction In Revenue Requirement For Recovery of Actual Test Year PJM Transmission Costs			14.0
Regulatory Assets Expected to be Recovered Through Securitization			485.0
Securitized Plant Retirement Costs			297.0
Securitized Deferred Storm Costs			79.0
Securitized Purchased Power Expenses			49.0
Securitized Under-Recovered Rider Costs			58.0
Securitized Deferred Issuance Related Expenses			2.0
2023 Kentucky Base Rate and Securitization Case [Member] | Kentucky Power Co [Member] | Mitchell Power Plant
Public Utilities, General Disclosures [Line Items]
Net Property, Plant and Equipment			552.0
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%
Settlement Agreement Annual Increase Step One			$ 28.0
Settlement Agreement Annual Increase Step Two			$ 34.0
Settlement Agreement Return on Common Equity			9.85%
Settlement Agreement Debt Capital Structure			50.00%
Settlement Agreement Equity Capital Structure			50.00%
Settlement Agreement Adjusted Equity Capital Structure			51.20%
Settlement Agreement Increase Related to Depreciation Expense			$ 25.0
Settlement Agreement Increase Related to Storm Expense			11.0
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%
Approved Annual Revenue Increase			$ 17.0
Approved Return on Common Equity			9.86%
Amount of Increase Related to Annual Depreciation Expense			$ 11.0
Requested Debt Capital Structure			49.40%
Requested Equity Capital Structure			50.60%
Approved Debt Capital Structure			52.00%
Approved Equity Capital Structure			48.00%
2024 Virginia Base Rate Case [Member] | Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Requested Return on Equity			10.80%
Requested Annual Base Rate Increase			$ 64.0
Requested Debt Capital Structure			51.00%
Requested Equity Capital Structure			49.00%
Original Requested Annual Base Rate Increase			$ 95.0
Alternative Annual Base Rate Increase			45.0
Fuel Adjustment Clause [Member] | Kentucky Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Purchased Power Cost Recoveries			432.0
Rockport Offset Recovery [Member] | Kentucky Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Requested Recovery of Allowed Costs			41.0
Estimated Allowed Costs Recovered Through Rider			23.0
Approved Recovery of Allowed Costs Through Interim Rates			18.0
ENEC Filing [Member] | Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Under-Recovered Costs Disallowance			232.0
Approved Recovery Under-Recovered Costs			$ 321.0
Approved Carrying Charge			4.00%
Requested Annual ENEC Filing Rate Increase			$ 20.0
Requested Total Annual ENEC Filing Rate Increase			58.0
Requested Annual ENEC Filing Rate Increase for Recovery of Under-Recovered Costs			38.0
Approved Annual ENEC Filing Rate Increase for Recovery of Under-Recovered Costs			38.0
2024 West Virginia Base Rate Case [Member] | Appalachian Power Co [Member] | Subsequent Event [Member]
Public Utilities, General Disclosures [Line Items]
Requested Annual Increase	$ 251.0
Requested Return on Equity	10.80%
Requested Deferred Storm Costs	$ 118.0
Requested Debt Capital Structure	52.00%
Requested Equity Capital Structure	48.00%
Regulatory Assets Expected to be Recovered Through Securitization				$ 2,400.0
Annual MRBC Surcharge Update	$ 94.0
Annual Mitchell Base Rate Surcharge	21.0
Requested Annual Increase Without Securitization	$ 37.0
Annual Increase April 1st Surcharge	3.00%
Virginia FAC [Member] | Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Under-Recovered Fuel Balance			164.0
West Virginia MRBC [Member] | Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Requested Annual MRBC Increase			$ 32.0
Hurricane Helene [Member] | Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Customers Without Power | Customers			260,000
Incremental Other Operation and Maintenance Expenses			$ 19.0
Capitalized Storm Costs			8.0
Deferred Incremental Other Operation and Maintenance Expenses			16.0
Estimated Total Storm Restoration Costs			$ 140.0
Percentage of Deferred Storm Regulatory Assets			70.00%
Percentage of Capitalized Storm Costs			30.00%
Hurricane Helene [Member] | Appalachian Power Co [Member] | Virginia
Public Utilities, General Disclosures [Line Items]
Incremental Other Operation and Maintenance Expenses			$ 13.0
Hurricane Helene [Member] | Appalachian Power Co [Member] | West Virginia
Public Utilities, General Disclosures [Line Items]
Incremental Other Operation and Maintenance Expenses			6.0
APCo Portion [Member] | ENEC Filing [Member] | Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Under-Recovered Costs Disallowance			136.0
Approved Recovery Under-Recovered Costs			174.0
Minimum Net Actuarial Loss [Member] | Fuel Adjustment Clause [Member] | Kentucky Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Recommended Disallowance from Staff or Intervenors			44.0
Minimum Net Actuarial Loss [Member] | 2023 Michigan PSCR Reconciliation [Member] | Indiana Michigan Power Co [Member] | Subsequent Event [Member]
Public Utilities, General Disclosures [Line Items]
Recommended Disallowance Purchased Power OVEC ICPA		$ 3.0
Maximum Net Actuarial Loss [Member] | Fuel Adjustment Clause [Member] | Kentucky Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Recommended Disallowance from Staff or Intervenors			$ 60.0
Maximum Net Actuarial Loss [Member] | 2023 Michigan PSCR Reconciliation [Member] | Indiana Michigan Power Co [Member] | Subsequent Event [Member]
Public Utilities, General Disclosures [Line Items]
Recommended Disallowance Purchased Power OVEC ICPA		$ 15.0