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EFFECTS OF REGULATION - Regulatory Asset - OPCo (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 5,129.2 | $ 5,092.4
Pending final regulatory approval |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 1,310.8 | 837.3
Approved for recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 3,818.4 | 4,255.1
Earns/earning a return | Pending final regulatory approval |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 395.1 | 349.9
Earns/earning a return | Pending final regulatory approval | Other Regulatory Assets Pending Final Regulatory Approval |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 20.7 | 49.8
Earns/earning a return | Pending final regulatory approval | Storm-Related Costs |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 51.0 | 0.0
Earns/earning a return | Approved for recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 1,711.5 | 1,946.9
Earns/earning a return | Approved for recovery | Ohio Basic Transmission Cost Rider |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 26.1 | 42.2
Remaining Recovery Period | 2 years |
Earns/earning a return | Approved for recovery | Storm-Related Costs |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 106.7 | 170.9
Remaining Recovery Period | 7 years |
Earns/earning a return | Approved for recovery | Other Regulatory Assets Approved for Recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 159.9 | 124.9
Does not earns/earning a return | Pending final regulatory approval |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 915.7 | 487.4
Does not earns/earning a return | Pending final regulatory approval | Other Regulatory Assets Pending Final Regulatory Approval |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 86.3 | 52.6
Does not earns/earning a return | Pending final regulatory approval | Storm-Related Costs |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 300.8 | 408.9
Does not earns/earning a return | Approved for recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 2,106.9 | 2,308.2
Does not earns/earning a return | Approved for recovery | Pension and OPEB Funded Status |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 974.2 | 1,054.1
Remaining Recovery Period | 12 years |
Does not earns/earning a return | Approved for recovery | OVEC Purchased Power |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 52.0 | 50.1
Remaining Recovery Period | 2 years |
Does not earns/earning a return | Approved for recovery | Unrealized Loss on Forward Commitments |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 53.3 | 131.4
Remaining Recovery Period | 8 years |
Does not earns/earning a return | Approved for recovery | Smart Grid Costs |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 33.8 | 26.3
Remaining Recovery Period | 2 years |
Does not earns/earning a return | Approved for recovery | Storm-Related Costs |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 66.5 | 38.5
Remaining Recovery Period | 7 years |
Does not earns/earning a return | Approved for recovery | Ohio Enhanced Service Reliability Plan |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 26.2 | 35.3
Remaining Recovery Period | 2 years |
Does not earns/earning a return | Approved for recovery | Ohio Distribution Investment Rider |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 11.0 | 35.3
Remaining Recovery Period | 2 years |
Does not earns/earning a return | Approved for recovery | Other Regulatory Assets Approved for Recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 240.1 | 269.1
OHIO POWER COMPANY |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 379.1 | 455.0
OHIO POWER COMPANY | Pending final regulatory approval |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 0.5 | 23.6
OHIO POWER COMPANY | Approved for recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 378.6 | 431.4
OHIO POWER COMPANY | Earns/earning a return | Pending final regulatory approval |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 0.4 | 0.0
OHIO POWER COMPANY | Earns/earning a return | Pending final regulatory approval | Other Regulatory Assets Pending Final Regulatory Approval |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 0.4 | 0.0
OHIO POWER COMPANY | Earns/earning a return | Approved for recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 26.1 | 44.0
OHIO POWER COMPANY | Earns/earning a return | Approved for recovery | Ohio Basic Transmission Cost Rider |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 26.1 | 42.2
Remaining Recovery Period | 2 years |
OHIO POWER COMPANY | Earns/earning a return | Approved for recovery | Ohio Distribution Decoupling |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 0.0 | 1.8
OHIO POWER COMPANY | Does not earns/earning a return | Pending final regulatory approval |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 0.1 | 23.6
OHIO POWER COMPANY | Does not earns/earning a return | Pending final regulatory approval | Other Regulatory Assets Pending Final Regulatory Approval |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 0.1 | 0.0
OHIO POWER COMPANY | Does not earns/earning a return | Approved for recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 352.5 | 387.4
OHIO POWER COMPANY | Does not earns/earning a return | Approved for recovery | Pension and OPEB Funded Status |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 134.0 | 147.1
Remaining Recovery Period | 12 years |
OHIO POWER COMPANY | Does not earns/earning a return | Approved for recovery | OVEC Purchased Power |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 52.0 | 50.1
Remaining Recovery Period | 2 years |
OHIO POWER COMPANY | Does not earns/earning a return | Approved for recovery | Unrealized Loss on Forward Commitments |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 47.6 | 50.8
Remaining Recovery Period | 8 years |
OHIO POWER COMPANY | Does not earns/earning a return | Approved for recovery | Smart Grid Costs |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 33.8 | 26.3
Remaining Recovery Period | 2 years |
OHIO POWER COMPANY | Does not earns/earning a return | Approved for recovery | Storm-Related Costs |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 28.6 | 30.9
Remaining Recovery Period | 2 years |
OHIO POWER COMPANY | Does not earns/earning a return | Approved for recovery | Ohio Enhanced Service Reliability Plan |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 26.2 | 35.3
Remaining Recovery Period | 2 years |
OHIO POWER COMPANY | Does not earns/earning a return | Approved for recovery | Bad Debt Rider |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 13.7 | 0.7
Remaining Recovery Period | 2 years |
OHIO POWER COMPANY | Does not earns/earning a return | Approved for recovery | Ohio Distribution Investment Rider |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 11.0 | 35.3
Remaining Recovery Period | 2 years |
OHIO POWER COMPANY | Does not earns/earning a return | Approved for recovery | Other Regulatory Assets Approved for Recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 5.6 | $ 10.9

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
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