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FINANCING ACTIVITIES - Schedule of Maximum and Minimum Interest Rates for Funds Either Borrowed from or Loaned to Utility Money Pool (Details) - Utility | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
SWEPCo |  |
Short-Term Debt [Line Items] |  |
Maximum Interest Rate | 4.83% | 5.79%
Minimum Interest Rate | 4.00% | 5.14%
OPCo |  |
Short-Term Debt [Line Items] |  |
Maximum Interest Rate | 4.83% | 5.79%
Minimum Interest Rate | 4.00% | 5.14%
I&M |  |
Short-Term Debt [Line Items] |  |
Maximum Interest Rate | 4.83% | 5.79%
Minimum Interest Rate | 4.00% | 5.14%
AEP Texas |  |
Short-Term Debt [Line Items] |  |
Maximum Interest Rate | 4.83% | 5.79%
Minimum Interest Rate | 4.00% | 5.14%
APCo |  |
Short-Term Debt [Line Items] |  |
Maximum Interest Rate | 4.83% | 5.79%
Minimum Interest Rate | 4.00% | 5.14%
PSO |  |
Short-Term Debt [Line Items] |  |
Maximum Interest Rate | 4.83% | 5.79%
Minimum Interest Rate | 4.00% | 5.14%
AEPTCo |  |
Short-Term Debt [Line Items] |  |
Maximum Interest Rate | 4.83% | 5.79%
Minimum Interest Rate | 4.00% | 5.14%

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- Definition The maximum weighted-average interest rate of funds outstanding at that time, calculated on a daily basis, either borrowed from or loaned 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_MaximumInterestRate
Namespace Prefix: | aep_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The minimum weighted-average interest rate of funds outstanding at that time, calculated on a daily basis, either borrowed from or loaned 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_MinimumInterestRate
Namespace Prefix: | aep_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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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: | aep_MoneyPoolParticipantbyCompanyTypeAxis=aep_UtilityMember
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: |

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

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

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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: | dei_LegalEntityAxis=aep_AppalachianPowerCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=aep_PublicServiceCompanyOfOklahomaMember
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: |