FINANCING ACTIVITIES - Schedule of Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits (Details) - Utility - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
AEP Texas
Short-Term Debt [Line Items]
Maximum Borrowings	$ 468	$ 375
Maximum Loans	486	274
Average Borrowings	159	234
Average Loans	94	165
Authorized Short-term Borrowing Limit	750	600
AEP Texas \| Related Party
Short-Term Debt [Line Items]
Net Loans to (Borrowings from)	(188)	(285)
AEPTCo
Short-Term Debt [Line Items]
Maximum Borrowings	404	313
Maximum Loans	312	332
Average Borrowings	176	72
Average Loans	50	138
Authorized Short-term Borrowing Limit	1,070	820
AEPTCo \| Related Party
Short-Term Debt [Line Items]
Net Loans to (Borrowings from)	(140)	(73)
APCo
Short-Term Debt [Line Items]
Maximum Borrowings	264	400
Maximum Loans	464	132
Average Borrowings	126	103
Average Loans	25	30
Authorized Short-term Borrowing Limit	750	750
APCo \| Related Party
Short-Term Debt [Line Items]
Net Loans to (Borrowings from)	(192)	(77)
I&M
Short-Term Debt [Line Items]
Maximum Borrowings	145	136
Maximum Loans	290	8
Average Borrowings	71	59
Average Loans	132	4
Authorized Short-term Borrowing Limit	750	500
I&M \| Related Party
Short-Term Debt [Line Items]
Net Loans to (Borrowings from)	192	(127)
OPCo
Short-Term Debt [Line Items]
Maximum Borrowings	271	310
Maximum Loans	166	183
Average Borrowings	120	181
Average Loans	82	94
Authorized Short-term Borrowing Limit	600	600
OPCo \| Related Party
Short-Term Debt [Line Items]
Net Loans to (Borrowings from)	(79)	115
PSO
Short-Term Debt [Line Items]
Maximum Borrowings	505	309
Maximum Loans	391	315
Average Borrowings	183	171
Average Loans	166	288
Authorized Short-term Borrowing Limit	750	750
PSO \| Related Party
Short-Term Debt [Line Items]
Net Loans to (Borrowings from)	(171)	232
SWEPCo
Short-Term Debt [Line Items]
Maximum Borrowings	472	362
Maximum Loans	1,117	59
Average Borrowings	254	250
Average Loans	110	57
Authorized Short-term Borrowing Limit	750	750
SWEPCo \| Related Party
Short-Term Debt [Line Items]
Net Loans to (Borrowings from)	$ 23	$ (275)

Authorized Short-term Borrowing Limit by regulatory orders.

No definition available.

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- 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

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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- 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

Net Loans to (Borrowings from) the Utility Money

+ References

No definition available.

+ Details

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Namespace Prefix:	aep_
Data Type:	xbrli:monetaryItemType
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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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