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RATE MATTERS - FERC Rate Matters (Details) $ in Millions | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Oct. 31, 2023 USD ($) | Sep. 30, 2025 USD ($) | Jun. 30, 2025 order | Jan. 31, 2024 order
Public Utilities, General Disclosures [Line Items] |  |  |  |
Number of order FERC issues | order |  |  | 2 | 2
Independence Energy Connection Project |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Aep share of independence energy connection capital costs |  | $ 91 |  |
Request to Update SWEPCo Generation Depreciation Rates |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Requested annual revenue requirement | $ 5 |  |  |

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- Definition Number of Order FERC Issues + References No definition available. + Details
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X
- Definition Parent Share of Independence Energy Connection Capital Costs + References No definition available. + Details
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Namespace Prefix: | aep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Requested Annual Revenue Requirement + References No definition available. + Details
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Namespace Prefix: | aep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | aep_FERCMatterAxis=aep_RequestToUpdateSWEPCoGenerationDepreciationRatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |