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FINANCING ACTIVITIES - Schedule of Direct Borrowing Activity (Details) - Direct Borrowing - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
AEP TRANSMISSION COMPANY, LLC |  |
Short-Term Debt [Line Items] |  |
Maximum Borrowings | $ 49.4 | $ 42.7
Maximum Loans | 148.5 | 158.1
Average Borrowings | 14.9 | 18.0
Average Loans | 57.0 | 64.2
Borrowings | 0.0 | 42.7
Loans | 20.4 | 0.0
Authorized Short-term Borrowing Limit | 0.0 | 0.0
SWTCo |  |
Short-Term Debt [Line Items] |  |
Maximum Borrowings | 1.9 | 1.6
Maximum Loans | 0.0 | 0.0
Average Borrowings | 1.8 | 1.6
Average Loans | 0.0 | 0.0
Borrowings | 1.8 | 1.7
Loans | 0.0 | 0.0
Authorized Short-term Borrowing Limit | $ 50.0 | $ 50.0

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- Definition Authorized Short-term Borrowing Limit by regulatory orders. + References No definition available. + Details
Name: | aep_AuthorizedShortTermBorrowingLimit
Namespace Prefix: | aep_
Data Type: | xbrli:monetaryItemType
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
Name: | aep_AverageBorrowingsfromMoneyPool
Namespace Prefix: | aep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
Name: | aep_AverageLoanstoMoneyPool
Namespace Prefix: | aep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Borrowings from Parent at period end. Parent represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries. + References No definition available. + Details
Name: | aep_BorrowingsfromParent
Namespace Prefix: | aep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Loans to Parent at period end. Parent represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries. + References No definition available. + Details
Name: | aep_LoanstoParent
Namespace Prefix: | aep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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
Name: | aep_MaximumBorrowingsfromMoneyPool
Namespace Prefix: | aep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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
Name: | aep_MaximumLoanstoMoneyPool
Namespace Prefix: | aep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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
Name: | us-gaap_ShortTermDebtLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | aep_MoneyPoolParticipantbyCompanyTypeAxis=aep_DirectBorrowingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=aep_AEPTransmissionCompanyLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=aep_AEPSouthwesternTransmissionCoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |