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FINANCING ACTIVITIES - Schedule of Nonutility Money Pool Activity (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
AEP Texas |  |
Short-Term Debt [Line Items] |  |
Advances to Affiliates | $ 425.3 | $ 7.2
Nonutility | AEP Texas |  |
Short-Term Debt [Line Items] |  |
Maximum Loans | 7.2 |
Average Loans | 7.1 |
Nonutility | AEP Texas | Related Party |  |
Short-Term Debt [Line Items] |  |
Advances to Affiliates | 7.2 |
Nonutility | SWEPCo |  |
Short-Term Debt [Line Items] |  |
Maximum Loans | 2.4 |
Average Loans | 2.1 |
Nonutility | SWEPCo | Related Party |  |
Short-Term Debt [Line Items] |  |
Advances to Affiliates | $ 0.0 |

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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 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

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- Definition Amount, after allowance, of receivables classified as other, due within one year or the operating cycle, if longer. + References No definition available. + Details
Name: | us-gaap_OtherReceivablesNetCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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
Name: | us-gaap_ShortTermDebtLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=aep_AEPTexasInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
Name: | us-gaap_RelatedPartyTransactionAxis=us-gaap_RelatedPartyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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