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BENEFIT PLANS - Narrative (Details)	Mar. 31, 2026 plan
Retirement Benefits [Abstract]
Defined benefit plan, number of plans	2

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- Definition

Defined Benefit Plan, Number Of Unfunded Plans

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No definition available.

+ Details

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Namespace Prefix:	aep_
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Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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