Public Utilities, Approved Recovery, Period

No definition available.

Name:	aep_PublicUtilitiesApprovedRecoveryPeriod
Namespace Prefix:	aep_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount requested for net annual increase.

+ References

No definition available.

+ Details

Name:	aep_PublicUtilitiesRequestedNetAnnualIncrease
Namespace Prefix:	aep_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Regulatory Asset, Requested Recovery Amount

+ References

No definition available.

+ Details

Name:	aep_RegulatoryAssetRequestedRecoveryAmount
Namespace Prefix:	aep_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of public utility's approved rate increase (decrease) by regulatory agency.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesApprovedRateIncreaseDecreaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage of public utility's approved return on equity.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesApprovedReturnOnEquityPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- 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_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of public utility's requested debt to capital, including debt and equity.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesRequestedDebtCapitalStructurePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of public utility's requested equity to capital, including debt and equity.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesRequestedEquityCapitalStructurePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of public utility's requested rate increase (decrease) with regulatory agency.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage of public utility's requested return on equity.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesRequestedReturnOnEquityPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	aep_BaseRateAxis=aep_A2025TexasBaseRateCaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilityAxis=aep_PirkeyPlantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

RATE MATTERS - SWEPCo Rate Matters (Details) - 2025 Texas Base Rate Case - SOUTHWESTERN ELECTRIC POWER COMPANY - USD ($) $ in Millions	1 Months Ended
	Sep. 30, 2026	Mar. 31, 2026	Oct. 31, 2025
Public Utilities, General Disclosures [Line Items]
Requested annual base rate increase (decrease)	$ 48		$ 164
Requested return on equity	9.53%		10.75%
Requested debt capital structure	48.02%		48.00%
Requested equity capital structure	51.98%		52.00%
Requested net annual increase			$ 95
Regulatory asset, requested to recovery amount	$ 11
Approved annual base rate increase		$ 26
Approved return on equity		9.60%
Minimum
Public Utilities, General Disclosures [Line Items]
Requested annual base rate increase (decrease)		$ (36)
Requested return on equity		9.25%
Maximum
Public Utilities, General Disclosures [Line Items]
Requested annual base rate increase (decrease)		$ (64)
Requested return on equity		9.44%
Pirkey Plant
Public Utilities, General Disclosures [Line Items]
Regulatory asset, requested to recovery amount			$ 21
Public utilities, approved recovery, amount	19 years