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EFFECTS OF REGULATION - Regulatory Asset - AEP Texas (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 | Storm-Related Costs |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 51.0 | 0.0
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 | Approved for recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 1,711.5 | 1,946.9
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 | Texas Mobile Temporary Emergency Electric Energy Facilities Rider |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 32.6 | 33.4
Remaining Recovery Period | 2 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 | Storm-Related Costs |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 300.8 | 408.9
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 | 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 | 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 | Other Regulatory Assets Approved for Recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 240.1 | 269.1
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 |
AEP TEXAS INC. |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 353.6 | 315.3
AEP TEXAS INC. | Pending final regulatory approval |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 77.1 | 64.3
AEP TEXAS INC. | Approved for recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 276.5 | 251.0
AEP TEXAS INC. | Approved for recovery | Texas Transmission Cost Recovery Factor |  |
Regulatory Asset [Line Items] |  |
Remaining Recovery Period | 2 years |
AEP TEXAS INC. | Earns/earning a return | Pending final regulatory approval |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 41.3 | 0.0
AEP TEXAS INC. | Earns/earning a return | Pending final regulatory approval | Storm-Related Costs |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 41.3 | 0.0
AEP TEXAS INC. | Earns/earning a return | Approved for recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 60.8 | 43.5
AEP TEXAS INC. | Earns/earning a return | Approved for recovery | Texas Mobile Temporary Emergency Electric Energy Facilities Rider |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 32.6 | 33.4
Remaining Recovery Period | 2 years |
AEP TEXAS INC. | Earns/earning a return | Approved for recovery | Meter Replacement Costs |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 5.8 | 9.4
Remaining Recovery Period | 2 years |
AEP TEXAS INC. | Earns/earning a return | Approved for recovery | Other Regulatory Assets Approved for Recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 22.4 | 0.7
AEP TEXAS INC. | Does not earns/earning a return | Pending final regulatory approval |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 35.8 | 64.3
AEP TEXAS INC. | Does not earns/earning a return | Pending final regulatory approval | Storm-Related Costs |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 13.1 | 37.7
AEP TEXAS INC. | Does not earns/earning a return | Pending final regulatory approval | Deferred Pension and OPEB Costs |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 15.6 | 0.0
AEP TEXAS INC. | Does not earns/earning a return | Pending final regulatory approval | Line Inspection Costs |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 5.8 | 5.7
AEP TEXAS INC. | 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 | 1.3 | 20.9
AEP TEXAS INC. | Does not earns/earning a return | Approved for recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 215.7 | 207.5
AEP TEXAS INC. | Does not earns/earning a return | Approved for recovery | Other Regulatory Assets Approved for Recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 14.8 | 15.1
AEP TEXAS INC. | Does not earns/earning a return | Approved for recovery | Pension and OPEB Funded Status |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 177.5 | 183.2
Remaining Recovery Period | 12 years |
AEP TEXAS INC. | Does not earns/earning a return | Approved for recovery | Texas Transmission Cost Recovery Factor |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 14.2 | 0.0
AEP TEXAS INC. | Does not earns/earning a return | Approved for recovery | Peak Demand Reduction/Energy Efficiency |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 9.2 | $ 9.2
Remaining Recovery Period | 2 years |

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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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