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FINANCING ACTIVITIES - Schedule of Maximum, Minimum and Average Interest Rates for Funds Borrowed from and Loaned to the Nonutility Money Pool (Details) - Nonutility	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
AEP Texas
Short-Term Debt [Line Items]
Maximum Interest Rate for Funds Loaned	4.76%	5.79%
Minimum Interest Rate for Funds Loaned	4.27%	5.25%
Average Interest Rate for Funds Loaned	4.66%	5.64%
SWEPCo
Short-Term Debt [Line Items]
Maximum Interest Rate for Funds Loaned	4.76%	5.79%
Minimum Interest Rate for Funds Loaned	4.62%	5.25%
Average Interest Rate for Funds Loaned	4.69%	5.64%

X

- 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

X

- Definition

The maximum weighted-average interest rate of funds outstanding at that time, calculated on a daily basis, loaned during the period.

+ References

No definition available.

+ Details

Name:	aep_MaximumInterestRateForFundsLoaned
Namespace Prefix:	aep_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The minimum weighted-average interest rate of funds outstanding at that time, calculated on a daily basis, loaned during the period.

+ References

No definition available.

+ Details

Name:	aep_MinimumInterestRateforFundsLoaned
Namespace Prefix:	aep_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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_NonutilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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