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INCOME TAXES - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
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Jun. 30, 2025 | Mar. 31, 2024
Income Tax Disclosure [Abstract] |  |
Tax benefit recognized from the reduction of a regulatory liability |  | $ 224
Tax benefit recognized from the remeasurement of excess ADIT | $ 383 |

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- Definition Tax Benefit Recognized From The Reduction Of A Regulatory Liability + 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 Tax Benefit Recognized from the Remeasurement Of Excess ADIT + References No definition available. + Details
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Namespace Prefix: | aep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration