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PROPERTY, PLANT, AND EQUIPMENT - Allowance for Equity Funds and Borrowed Funds Used During Construction (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Property, Plant and Equipment [Line Items] |  |  |
Allowance for equity funds used during construction | $ 211.0 | $ 174.9 | $ 133.7
Borrowed funds used during construction | 129.8 | 117.3 | 63.0
AEP TEXAS INC. |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Allowance for equity funds used during construction | 45.9 | 28.4 | 19.7
Borrowed funds used during construction | 30.7 | 23.4 | 11.5
AEP TRANSMISSION COMPANY, LLC |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Allowance for equity funds used during construction | 89.4 | 83.2 | 70.7
Borrowed funds used during construction | 33.7 | 31.4 | 22.4
APPALACHIAN POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Allowance for equity funds used during construction | 16.1 | 11.9 | 11.7
Borrowed funds used during construction | 10.5 | 14.1 | 6.5
INDIANA MICHIGAN POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Allowance for equity funds used during construction | 13.3 | 10.9 | 9.8
Borrowed funds used during construction | 9.2 | 7.7 | 5.7
OHIO POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Allowance for equity funds used during construction | 23.4 | 17.1 | 13.9
Borrowed funds used during construction | 12.8 | 14.0 | 6.7
PUBLIC SERVICE COMPANY OF OKLAHOMA |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Allowance for equity funds used during construction | 7.4 | 8.4 | 1.5
Borrowed funds used during construction | 9.7 | 5.2 | 2.7
SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Allowance for equity funds used during construction | 13.5 | 11.5 | 4.9
Borrowed funds used during construction | $ 15.1 | $ 9.8 | $ 4.3

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- Definition The component of the allowance for funds used during construction during the period based on an assumed rate of return on equity funds used in financing the construction of regulated assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 980 -SubTopic 835 -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478698/980-835-25-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 980 -SubTopic 835 -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479123/980-835-45-1 + Details
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