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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
	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%

X

- 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

X

- 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

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_UtilityMember
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:

X

- Details

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

X

- Details

Name:	dei_LegalEntityAxis=aep_IndianaMichiganPowerCompanyMember
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_AppalachianPowerCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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