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EFFECTS OF REGULATION - Regulatory Liabilities - OPCo (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | $ 8,344.0 | $ 8,182.4
Pending final regulatory determination |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 322.0 | 207.9
Approved for payment |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | $ 8,022.0 | 7,974.5
Does not pay/paying a return | Over-recovered Fuel Costs |  |
Regulatory Liability [Line Items] |  |
Remaining Refund Period | 1 year |
Does not pay/paying a return | Pending final regulatory determination |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | $ 146.0 | 104.8
Does not pay/paying a return | Pending final regulatory determination | FERC 2021 Transmission Formula Rate Challenge Refunds |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 131.3 | 103.1
Does not pay/paying a return | Pending final regulatory determination | Other Regulatory Liabilities Pending Final Regulatory Determination |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 14.7 | 1.7
Does not pay/paying a return | Approved for payment |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 2,495.6 | 2,151.4
Does not pay/paying a return | Approved for payment | Other Regulatory Liabilities Approved for Payment |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 90.1 | 106.5
Does not pay/paying a return | Approved for payment | Over-recovered Fuel Costs |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | $ 32.1 | 26.1
Remaining Refund Period | 8 years |
Pays/paying a return | Over-recovered Fuel Costs |  |
Regulatory Liability [Line Items] |  |
Remaining Refund Period | 1 year |
Pays/paying a return | Pending final regulatory determination |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | $ 176.0 | 103.1
Pays/paying a return | Pending final regulatory determination | Income Taxes, Net |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 176.0 | 103.1
Pays/paying a return | Approved for payment |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 5,526.4 | 5,823.1
Pays/paying a return | Approved for payment | Asset Removal Costs |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 3,828.0 | 3,563.5
Pays/paying a return | Approved for payment | Income Taxes, Net |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 1,622.1 | 2,179.7
Regulatory liabilities, not subject to rate normalization requirements, amount | $ 192.0 | 228.0
Regulatory liabilities, not subject to rate normalization requirements, refund period | 10 years |
Pays/paying a return | Approved for payment | Other Regulatory Liabilities Approved for Payment |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | $ 40.4 | 35.0
OHIO POWER COMPANY |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 987.7 | 1,003.6
OHIO POWER COMPANY | Approved for payment |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 914.8 | 946.4
OHIO POWER COMPANY | Does not pay/paying a return | Pending final regulatory determination |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 72.9 | 57.2
OHIO POWER COMPANY | Does not pay/paying a return | Pending final regulatory determination | FERC 2021 Transmission Formula Rate Challenge Refunds |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 72.7 | 57.0
OHIO POWER COMPANY | Does not pay/paying a return | Pending final regulatory determination | Other Regulatory Liabilities Pending Final Regulatory Determination |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 0.2 | 0.2
OHIO POWER COMPANY | Does not pay/paying a return | Approved for payment |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 63.2 | 62.7
OHIO POWER COMPANY | Does not pay/paying a return | Approved for payment | Other Regulatory Liabilities Approved for Payment |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 8.3 | 13.4
OHIO POWER COMPANY | Does not pay/paying a return | Approved for payment | Over-recovered Fuel Costs |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | $ 32.1 | 26.1
Remaining Refund Period | 8 years |
OHIO POWER COMPANY | Does not pay/paying a return | Approved for payment | Peak Demand Reduction/Energy Efficiency |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | $ 22.8 | 23.2
Remaining Refund Period | 2 years |
OHIO POWER COMPANY | Pays/paying a return | Approved for payment |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | $ 851.6 | 883.7
OHIO POWER COMPANY | Pays/paying a return | Approved for payment | Asset Removal Costs |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 480.0 | 475.5
OHIO POWER COMPANY | Pays/paying a return | Approved for payment | Income Taxes, Net |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 367.6 | 408.2
Regulatory liabilities, not subject to rate normalization requirements, amount | $ 100.0 | 132.0
Regulatory liabilities, not subject to rate normalization requirements, refund period | 4 years |
OHIO POWER COMPANY | Pays/paying a return | Approved for payment | Other Regulatory Liabilities Approved for Payment |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | $ 4.0 | $ 0.0

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- Definition Regulatory Liability, Not Subject to Rate Normalization Requirements. Amount + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amortization period for the recovery of regulatory liability, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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