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FINANCING ACTIVITIES - Schedule of Direct Borrowing Activity (Details) - Direct Borrowing $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($)
AEPTCo
Short-Term Debt [Line Items]
Maximum Borrowings	$ 106.6
Maximum Loans	132.6
Average Borrowings	17.7
Average Loans	45.3
Borrowings	0.0
Loans	49.7
Authorized Short-term Borrowing Limit	0.0
SWTCo
Short-Term Debt [Line Items]
Maximum Borrowings	2.0
Maximum Loans	0.0
Average Borrowings	1.9
Average Loans	0.0
Borrowings	2.0
Loans	0.0
Authorized Short-term Borrowing Limit	50.0
Midwest Transmission Holdings
Short-Term Debt [Line Items]
Maximum Borrowings	0.0
Maximum Loans	34.1
Average Borrowings	0.0
Average Loans	6.1
Borrowings	0.0
Loans	0.3
Authorized Short-term Borrowing Limit	$ 0.0

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- Definition

Authorized Short-term Borrowing Limit by regulatory orders.

+ References

No definition available.

+ Details

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X

- Definition

Average Borrowings from 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

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- Definition

Average Loans 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

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- Definition

Borrowings from Parent at period end. Parent represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries.

+ References

No definition available.

+ Details

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- Definition

Loans to Parent at period end. Parent represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries.

+ References

No definition available.

+ Details

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X

- Definition

Maximum Borrowings from a Money Pool at anytime during the period. The Money Pool represents a centralized funding mechanism AEP uses to meet the short-term cash requirements of certain subsidiaries.

+ References

No definition available.

+ Details

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Period Type:	duration

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- Definition

Maximum Loans to a Money Pool at anytime 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

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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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- Details

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- Details

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- Details

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