XML 195 R154.htm IDEA: XBRL DOCUMENT
v3.25.3

FINANCING ACTIVITIES - Schedule of Direct Borrowing Activity (Details) - Direct Borrowing $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2025 USD ($)
AEPTCo |
Short-Term Debt [Line Items] |
Maximum Borrowings | $ 106.6
Maximum Loans | 132.6
Average Borrowings | 17.7
Average Loans | 45.3
Borrowings | 0.0
Loans | 49.7
Authorized Short-term Borrowing Limit | 0.0
SWTCo |
Short-Term Debt [Line Items] |
Maximum Borrowings | 2.0
Maximum Loans | 0.0
Average Borrowings | 1.9
Average Loans | 0.0
Borrowings | 2.0
Loans | 0.0
Authorized Short-term Borrowing Limit | 50.0
Midwest Transmission Holdings |
Short-Term Debt [Line Items] |
Maximum Borrowings | 0.0
Maximum Loans | 34.1
Average Borrowings | 0.0
Average Loans | 6.1
Borrowings | 0.0
Loans | 0.3
Authorized Short-term Borrowing Limit | $ 0.0

X
- 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

X
- 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

X
- 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

X
- 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

X
- 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

X
- 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

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

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

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

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