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Rate Matters East Companies (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Public Utilities, General Disclosures [Line Items] |  |
Total Property, Plant and Equipment, Net | $ 73,339.1 | $ 68,304.1
Appalachian Power Co [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Total Property, Plant and Equipment, Net | 12,379.2 | 11,804.3
Indiana Michigan Power Co [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Total Property, Plant and Equipment, Net | 7,411.5 | 7,310.9
Ohio Power Co [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Total Property, Plant and Equipment, Net | $ 8,609.3 | $ 7,963.0
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% |
Proposed Previously Incurred Costs Expected to Recover | $ 37.0 |
Authorized Annual Base Rate Increase | 28.0 |
Approved Rider to Recover January 2021 through September 2022 | 48.0 |
Expensed Remaining Closed Coal Plant | 25.0 |
Approved Previously Incurred Costs to Recover | 37.0 |
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 | Kentucky Power Co [Member] | Mitchell Power Plant |  |
Public Utilities, General Disclosures [Line Items] |  |
Property, Plant and Equipment, Net | 577.0 |
2020-2022 Virginia Triennial Review | Appalachian Power Co [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Previously Incurred Costs Deferral Below Authorized ROE Band | 38.0 |
2021 and 2022 ENEC Filing | Appalachian Power Co [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
2021 Requested Increase in ENEC Rates | 73.0 |
2021 Projected ENEC Cost Incease | 18.0 |
2021 Cumulative ENEC Under Recovery | 55.0 |
2021 Approved ENEC Rate Increase | 7.0 |
2021 Approved Reduction in ENEC Projected Costs | 48.0 |
2022 Approved Projected ENEC Rate Increase | 31.0 |
2022 Requested Increase in ENEC Rates | 155.0 |
2022 Approved Overall ENEC Rate Increase | 93.0 |
2022 Requested Increase in ENEC Rates Second Filing | 297.0 |
2022 Recommended ENEC Under-Recovery Disallowance | 83.0 |
2022 Recommended Increase in ENEC Rates | 13.0 |
Current Cumulative ENEC Under Recovery | 520.0 |
June 2022 Storm Costs | Appalachian Power Co [Member] | West Virginia |  |
Public Utilities, General Disclosures [Line Items] |  |
Storm Expenses to be Requested in Separate Filing | 17.0 |
June 2022 Storm Costs | Ohio Power Co [Member] | Ohio |  |
Public Utilities, General Disclosures [Line Items] |  |
Storm Expenses to be Requested in Separate Filing | 20.0 |
Michigan Power Supply Cost Recovery Reconciliation | Indiana Michigan Power Co [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
ALJ Recommended Disallowance | 8.0 |
Disallowance of 2020 OVEC Costs | 1.0 |
Indiana Earnings Test Filings | Indiana Michigan Power Co [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
FAC Credit to Customers | 14.0 |
2022 Michigan Integrated Resource Plan Filing | Indiana Michigan Power Co [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Rockport U2 Leasehold Improvements Net Book Value | $ 17.0 |
Ohio ESP Filings [Member] | Ohio Power Co [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Proposed ESP Return on Common Equity | 10.65% |
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% |

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