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FINANCING ACTIVITIES - Schedule of Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool (Details) - Utility | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
AEP Texas |  |
Short-Term Debt [Line Items] |  |
Average Interest Rate for Funds Borrowed | 4.67% | 5.69%
Average Interest Rate for Funds Loaned | 4.37% | 5.48%
AEPTCo |  |
Short-Term Debt [Line Items] |  |
Average Interest Rate for Funds Borrowed | 4.65% | 5.68%
Average Interest Rate for Funds Loaned | 4.62% | 5.58%
APCo |  |
Short-Term Debt [Line Items] |  |
Average Interest Rate for Funds Borrowed | 4.67% | 5.72%
Average Interest Rate for Funds Loaned | 4.58% | 5.51%
I&M |  |
Short-Term Debt [Line Items] |  |
Average Interest Rate for Funds Borrowed | 4.69% | 5.64%
Average Interest Rate for Funds Loaned | 4.50% | 5.44%
OPCo |  |
Short-Term Debt [Line Items] |  |
Average Interest Rate for Funds Borrowed | 4.61% | 5.70%
Average Interest Rate for Funds Loaned | 4.70% | 5.49%
PSO |  |
Short-Term Debt [Line Items] |  |
Average Interest Rate for Funds Borrowed | 4.64% | 5.59%
Average Interest Rate for Funds Loaned | 4.68% | 0.00%
SWEPCo |  |
Short-Term Debt [Line Items] |  |
Average Interest Rate for Funds Borrowed | 4.69% | 5.58%
Average Interest Rate for Funds Loaned | 4.55% | 0.00%

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- Definition The average interest rate for funds borrowed 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_AverageInterestRateForFundsBorrowed
Namespace Prefix: | aep_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The average interest rate for funds 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_AverageInterestRateForFundsLoaned
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_
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- Details
Name: | aep_MoneyPoolParticipantbyCompanyTypeAxis=aep_UtilityMember
Namespace Prefix: |
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Balance Type: |
Period Type: |

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

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

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

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