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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
	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%

X

- 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

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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

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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

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- Details

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- Details

Name:	dei_LegalEntityAxis=aep_AEPTexasInc.Member
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- Details

Name:	dei_LegalEntityAxis=aep_AEPTransmissionCompanyLLCMember
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- Details

Name:	dei_LegalEntityAxis=aep_AppalachianPowerCompanyMember
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- Details

Name:	dei_LegalEntityAxis=aep_IndianaMichiganPowerCompanyMember
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- Details

Name:	dei_LegalEntityAxis=aep_OhioPowerCompanyMember
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Name:	dei_LegalEntityAxis=aep_PublicServiceCompanyOfOklahomaMember
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- Details

Name:	dei_LegalEntityAxis=aep_SouthwesternElectricPowerCompanyMember
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