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FINANCING ACTIVITIES - Schedule of Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits (Details) - Utility $ in Millions | 9 Months Ended
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Sep. 30, 2025 USD ($)
AEP Texas |
Short-Term Debt [Line Items] |
Maximum Borrowings | $ 468.4
Maximum Loans | 485.7
Average Borrowings | 172.6
Average Loans | 82.5
Authorized Short-term Borrowing Limit | 600.0
AEP Texas | Related Party |
Short-Term Debt [Line Items] |
Net Loans to (Borrowings from) | 418.1
AEPTCo |
Short-Term Debt [Line Items] |
Maximum Borrowings | 403.6
Maximum Loans | 312.2
Average Borrowings | 174.8
Average Loans | 44.2
Authorized Short-term Borrowing Limit | 820.0
AEPTCo | Related Party |
Short-Term Debt [Line Items] |
Net Loans to (Borrowings from) | (89.3)
APCo |
Short-Term Debt [Line Items] |
Maximum Borrowings | 263.5
Maximum Loans | 242.1
Average Borrowings | 127.8
Average Loans | 26.1
Authorized Short-term Borrowing Limit | 750.0
APCo | Related Party |
Short-Term Debt [Line Items] |
Net Loans to (Borrowings from) | 49.6
I&M |
Short-Term Debt [Line Items] |
Maximum Borrowings | 145.2
Maximum Loans | 157.2
Average Borrowings | 71.4
Average Loans | 46.2
Authorized Short-term Borrowing Limit | 500.0
I&M | Related Party |
Short-Term Debt [Line Items] |
Net Loans to (Borrowings from) | 157.2
OPCo |
Short-Term Debt [Line Items] |
Maximum Borrowings | 270.9
Maximum Loans | 165.9
Average Borrowings | 126.0
Average Loans | 81.7
Authorized Short-term Borrowing Limit | 600.0
OPCo | Related Party |
Short-Term Debt [Line Items] |
Net Loans to (Borrowings from) | (13.0)
PSO |
Short-Term Debt [Line Items] |
Maximum Borrowings | 505.1
Maximum Loans | 391.5
Average Borrowings | 221.2
Average Loans | 166.1
Authorized Short-term Borrowing Limit | 750.0
PSO | Related Party |
Short-Term Debt [Line Items] |
Net Loans to (Borrowings from) | (39.7)
SWEPCo |
Short-Term Debt [Line Items] |
Maximum Borrowings | 471.9
Maximum Loans | 269.7
Average Borrowings | 285.9
Average Loans | 88.7
Authorized Short-term Borrowing Limit | 750.0
SWEPCo | Related Party |
Short-Term Debt [Line Items] |
Net Loans to (Borrowings from) | $ 269.7

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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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- Definition Net Loans to (Borrowings from) the Utility Money + References No definition available. + Details
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Period Type: | instant

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- Details
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- Details
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- Details
Name: | dei_LegalEntityAxis=aep_AppalachianPowerCompanyMember
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- Details
Name: | dei_LegalEntityAxis=aep_IndianaMichiganPowerCompanyMember
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Name: | dei_LegalEntityAxis=aep_OhioPowerCompanyMember
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Name: | dei_LegalEntityAxis=aep_PublicServiceCompanyOfOklahomaMember
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