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Rate Matters East Companies (Details) - USD ($) $ in Thousands |  | 6 Months Ended |
--- | --- | --- | ---
Jul. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Public Utilities, General Disclosures [Line Items] |  |  |
Net Property, Plant and Equipment |  | $ 78,860,400 | $ 76,693,400
AEP Transmission Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Net Property, Plant and Equipment |  | 15,086,000 | 14,497,700
Appalachian Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Net Property, Plant and Equipment |  | 13,253,600 | 12,931,500
Indiana Michigan Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Net Property, Plant and Equipment |  | 7,731,300 | 7,629,000
Ohio Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Net Property, Plant and Equipment |  | $ 9,610,400 | $ 9,299,900
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 |  | $ 94,000 |
Requested Securitization Bonds Regulatory Assets Recovery |  | $ 471,000 |
KPCo Interest in Mitchell Plant |  | 50.00% |
Settlement Agreement Return on Common Equity |  | 9.75% |
Settlement Agreement Annual Increase |  | $ 75,000 |
Settlement Agreement Securitization Bonds Regulatory Assets Recovery |  | 471,000 |
Approved Net Increase in Kentucky Annual Revenues |  | 60,000 |
Reduction In Revenue Requirement For Recovery of Actual Test Year PJM Transmission Costs |  | 14,000 |
Regulatory Assets Expected to be Recovered Through Securitization |  | 481,000 |
Securitized Plant Retirement Costs |  | 293,000 |
Securitized Deferred Storm Costs |  | 79,000 |
Securitized Purchased Power Expenses |  | 48,000 |
Securitized Under-Recovered Rider Costs |  | 60,000 |
Securitized Deferred Issuance Related Expenses |  | 1,000 |
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 |  | 565,000 |
2023 Indiana Base Rate Case [Member] | Indiana Michigan Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Requested Annual Increase |  | $ 116,000 |
Requested Return on Equity |  | 10.50% |
Amount of Increase Related to Annual Depreciation Expense |  | $ 41,000 |
Requested Deferred Storm Costs |  | $ 15,000 |
Requested Debt Capital Structure |  | 48.80% |
Requested Equity Capital Structure |  | 51.20% |
Settlement Agreement Annual Increase Step One |  | $ 28,000 |
Settlement Agreement Annual Increase Step Two |  | $ 34,000 |
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 |  | $ 25,000 |
Settlement Agreement Increase Related to Storm Expense |  | 11,000 |
2023 Michigan Base Rate Case [Member] | Indiana Michigan Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Requested Annual Increase |  | $ 34,000 |
Requested Return on Equity |  | 10.50% |
Amount of Increase Related to Annual Depreciation Expense |  | $ 11,000 |
Requested Debt Capital Structure |  | 49.40% |
Requested Equity Capital Structure |  | 50.60% |
2023 Michigan Base Rate Case [Member] | Indiana Michigan Power Co [Member] | Subsequent Event [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Approved Annual Revenue Increase | $ 17,000 |  |
Approved Return on Common Equity | 9.86% |  |
Approved Debt Capital Structure | 52.00% |  |
Approved Equity Capital Structure | 48.00% |  |
2023 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 |  | $ 78,000 |
Requested Debt Capital Structure |  | 51.00% |
Requested Equity Capital Structure |  | 49.00% |
Original Requested Annual Base Rate Increase |  | $ 95,000 |
2023 Virginia Base Rate Case [Member] | Appalachian Power Co [Member] | Subsequent Event [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Recommended Annual Base Rate Decrease | $ 14,000 |  |
Recommended Return on Common Equity | 9.50% |  |
Fuel Adjustment Clause [Member] | Kentucky Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Purchased Power Cost Recoveries |  | 432,000 |
Rockport Offset Recovery [Member] | Kentucky Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Requested Recovery of Allowed Costs |  | 41,000 |
Estimated Allowed Costs Recovered Through Rider |  | 23,000 |
Approved Recovery of Allowed Costs Through Interim Rates |  | 18,000 |
2020 Michigan PSCR Reconciliation [Member] | Indiana Michigan Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Disallowed OVEC Purchase Power Costs |  | 1,000 |
2021 Michigan PSCR Reconciliation [Member] | Indiana Michigan Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Updated Recommended Disallowance Purchased Power OVEC ICPA |  | 1,000 |
Disallowed Rockport Purchased Power Costs |  | 10,000 |
Disallowed PSCR Shortfall |  | 497 |
Disallowed OVEC Purchase Power Costs |  | 1,000 |
Recommended Disallowance Purchased Power OVEC ICPA |  | 18,000 |
Recommended Shortfall Disallowed Costs |  | 14,000 |
2022 Michigan PSCR Reconciliation [Member] | Indiana Michigan Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Recommended Disallowance Purchased Power OVEC ICPA |  | 2,000 |
Recommended Shortfall Disallowed Costs |  | 6,000 |
ALJ Recommended Purchased Power Disallowance |  | 2,000 |
ENEC Filing [Member] | Appalachian Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Under-Recovered Costs Disallowance |  | 232,000 |
Approved Recovery Under-Recovered Costs |  | $ 321,000 |
Approved Carrying Charge |  | 4.00% |
Annual ENEC Filing Rate Increase |  | $ 58,000 |
APCo Portion [Member] | ENEC Filing [Member] | Appalachian Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Under-Recovered Costs Disallowance |  | 136,000 |
Approved Recovery Under-Recovered Costs |  | 174,000 |
Minimum [Member] | Fuel Adjustment Clause [Member] | Kentucky Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Recommended Disallowance from Staff or Intervenors |  | 44,000 |
Maximum [Member] | Fuel Adjustment Clause [Member] | Kentucky Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Recommended Disallowance from Staff or Intervenors |  | $ 60,000 |

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Data Type: | na
Balance Type: |
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X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |