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FINANCING ACTIVITIES - Schedule of Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits (Details) - Utility $ in Millions | 3 Months Ended
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Mar. 31, 2025 USD ($)
AEP Texas |
Short-Term Debt [Line Items] |
Maximum Borrowings | $ 468.4
Maximum Loans | 0.0
Average Borrowings | 252.7
Average Loans | 0.0
Authorized Short-term Borrowing Limit | 600.0
AEP Texas | Related Party |
Short-Term Debt [Line Items] |
Net Loans to (Borrowings from) | (144.4)
AEPTCo |
Short-Term Debt [Line Items] |
Maximum Borrowings | 403.6
Maximum Loans | 13.8
Average Borrowings | 211.8
Average Loans | 9.6
Authorized Short-term Borrowing Limit | 820.0
AEPTCo | Related Party |
Short-Term Debt [Line Items] |
Net Loans to (Borrowings from) | (276.1)
APCo |
Short-Term Debt [Line Items] |
Maximum Borrowings | 210.1
Maximum Loans | 24.2
Average Borrowings | 103.4
Average Loans | 18.3
Authorized Short-term Borrowing Limit | 750.0
APCo | Related Party |
Short-Term Debt [Line Items] |
Net Loans to (Borrowings from) | (48.5)
I&M |
Short-Term Debt [Line Items] |
Maximum Borrowings | 141.9
Maximum Loans | 0.0
Average Borrowings | 88.2
Average Loans | 0.0
Authorized Short-term Borrowing Limit | 500.0
I&M | Related Party |
Short-Term Debt [Line Items] |
Net Loans to (Borrowings from) | (83.7)
OPCo |
Short-Term Debt [Line Items] |
Maximum Borrowings | 29.9
Maximum Loans | 165.9
Average Borrowings | 19.5
Average Loans | 87.1
Authorized Short-term Borrowing Limit | 600.0
OPCo | Related Party |
Short-Term Debt [Line Items] |
Net Loans to (Borrowings from) | (9.7)
PSO |
Short-Term Debt [Line Items] |
Maximum Borrowings | 91.5
Maximum Loans | 232.0
Average Borrowings | 91.5
Average Loans | 154.8
Authorized Short-term Borrowing Limit | 750.0
PSO | Related Party |
Short-Term Debt [Line Items] |
Net Loans to (Borrowings from) | (91.5)
SWEPCo |
Short-Term Debt [Line Items] |
Maximum Borrowings | 406.8
Maximum Loans | 0.0
Average Borrowings | 337.3
Average Loans | 0.0
Authorized Short-term Borrowing Limit | 750.0
SWEPCo | Related Party |
Short-Term Debt [Line Items] |
Net Loans to (Borrowings from) | $ (399.8)

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Balance Type: | credit
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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Period Type: | duration

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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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Balance Type: | credit
Period Type: | duration

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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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Namespace Prefix: | aep_
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- Definition Net Loans to (Borrowings from) the Utility Money + References No definition available. + Details
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Namespace Prefix: | aep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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Name: | dei_LegalEntityAxis=aep_SouthwesternElectricPowerCompanyMember
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