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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 |  |  |

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