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FINANCING ACTIVITIES - Schedule of Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits (Details) - Utility - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
AEP TEXAS INC. |  |
Short-Term Debt [Line Items] |  |
Maximum Borrowings | $ 374.6 | $ 477.5
Maximum Loans | 274.3 | 42.0
Average Borrowings | 233.8 | 216.8
Average Loans | 165.1 | 12.9
Authorized Short-term Borrowing Limit | 600.0 | 600.0
AEP TEXAS INC. | Related Party |  |
Short-Term Debt [Line Items] |  |
Net Loans to (Borrowings from) | (284.9) | (103.7)
AEP TRANSMISSION COMPANY, LLC |  |
Short-Term Debt [Line Items] |  |
Maximum Borrowings | 313.3 | 471.3
Maximum Loans | 332.0 | 309.4
Average Borrowings | 71.8 | 135.6
Average Loans | 138.4 | 70.5
Authorized Short-term Borrowing Limit | 820.0 | 820.0
AEP TRANSMISSION COMPANY, LLC | Related Party |  |
Short-Term Debt [Line Items] |  |
Net Loans to (Borrowings from) | (72.9) | (62.8)
APPALACHIAN POWER COMPANY |  |
Short-Term Debt [Line Items] |  |
Maximum Borrowings | 399.5 | 388.6
Maximum Loans | 132.3 | 19.8
Average Borrowings | 102.6 | 283.5
Average Loans | 29.7 | 19.0
Authorized Short-term Borrowing Limit | 750.0 | 750.0
APPALACHIAN POWER COMPANY | Related Party |  |
Short-Term Debt [Line Items] |  |
Net Loans to (Borrowings from) | (77.3) | (320.7)
INDIANA MICHIGAN POWER COMPANY |  |
Short-Term Debt [Line Items] |  |
Maximum Borrowings | 135.8 | 475.3
Maximum Loans | 8.4 | 112.2
Average Borrowings | 58.8 | 84.0
Average Loans | 3.9 | 44.2
Authorized Short-term Borrowing Limit | 500.0 | 500.0
INDIANA MICHIGAN POWER COMPANY | Related Party |  |
Short-Term Debt [Line Items] |  |
Net Loans to (Borrowings from) | (126.8) | (63.3)
OHIO POWER COMPANY |  |
Short-Term Debt [Line Items] |  |
Maximum Borrowings | 310.0 | 485.7
Maximum Loans | 183.4 | 64.7
Average Borrowings | 180.5 | 183.0
Average Loans | 94.2 | 40.2
Authorized Short-term Borrowing Limit | 600.0 | 500.0
OHIO POWER COMPANY | Related Party |  |
Short-Term Debt [Line Items] |  |
Net Loans to (Borrowings from) | 114.9 | (110.5)
PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Short-Term Debt [Line Items] |  |
Maximum Borrowings | 308.9 | 375.0
Maximum Loans | 314.5 | 121.5
Average Borrowings | 171.4 | 92.5
Average Loans | 287.7 | 49.6
Authorized Short-term Borrowing Limit | 750.0 | 750.0
PUBLIC SERVICE COMPANY OF OKLAHOMA | Related Party |  |
Short-Term Debt [Line Items] |  |
Net Loans to (Borrowings from) | 232.0 | (54.4)
SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Short-Term Debt [Line Items] |  |
Maximum Borrowings | 362.2 | 401.6
Maximum Loans | 59.3 | 25.8
Average Borrowings | 249.5 | 150.7
Average Loans | 57.3 | 16.5
Authorized Short-term Borrowing Limit | 750.0 | 750.0
SOUTHWESTERN ELECTRIC POWER COMPANY | Related Party |  |
Short-Term Debt [Line Items] |  |
Net Loans to (Borrowings from) | $ (275.0) | $ (88.7)

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Period Type: | duration

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- Definition Average Borrowings from a Money Pool during the period. The Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries. + References No definition available. + Details
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- Definition Average Loans to a Money Pool during the period. The Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries. + References No definition available. + Details
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- Definition Maximum Borrowings from a Money Pool at anytime during the period. The Money Pool represents a centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries. + References No definition available. + Details
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- Definition Maximum Loans to a Money Pool at anytime during the period. The Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries. + References No definition available. + Details
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- Details
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- Details
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Name: | dei_LegalEntityAxis=aep_IndianaMichiganPowerCompanyMember
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Name: | dei_LegalEntityAxis=aep_OhioPowerCompanyMember
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