Number Of Member Companies Allocated For Power and Natural Gas Risk Management Activities

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Number Of States Within Service Area

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Revenue from Contract with Customer, Costs Allocation, Average Period

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of transactions with related party during the financial reporting period.

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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.

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RELATED PARTY TRANSACTIONS - Narrative (Details)	5 Months Ended	12 Months Ended
RELATED PARTY TRANSACTIONS - Narrative (Details)	Dec. 31, 2024 USD ($) state company	Dec. 31, 2024 USD ($) state company	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Aug. 31, 2023
Related Party Transaction [Line Items]
Number of states within service area \| state	11	11
G&M \| Fowler Ridge 2
Related Party Transaction [Line Items]
Ownership percentage					50.00%
Related Party
Related Party Transaction [Line Items]
Purchases from related party		$ 100,000
Power Coordination Agreement
Related Party Transaction [Line Items]
Number of member companies allocated for power and natural gas risk management activities \| company	4	4
Joint License Agreement \| AEP TRANSMISSION COMPANY, LLC
Related Party Transaction [Line Items]
Related party transaction, agreement term		50 years
Related party transaction, agreement term with counterparty		5 years
Related party transaction, agreement, expiration, auto-renew period		1 year
Direct Purchases from AEGCo \| INDIANA MICHIGAN POWER COMPANY
Related Party Transaction [Line Items]
Purchases from related party		$ 209,000,000	$ 181,000,000	$ 242,000,000
Ohio Auction SSO Load Delivery Purchases from Affiliates \| OHIO POWER COMPANY
Related Party Transaction [Line Items]
Purchases from related party		98,000,000	87,000,000	10,000,000
Clean Affordable Reliable Coalition (CARE)
Related Party Transaction [Line Items]
Related party transaction, amount		$ 0	$ 100,000	$ 200,000
Vendor Purchases
Related Party Transaction [Line Items]
Related party transaction, amount	$ 44,000,000
Vendor Purchases \| AEP TEXAS INC.
Related Party Transaction [Line Items]
Related party transaction, amount	25,000,000
Vendor Purchases \| PUBLIC SERVICE COMPANY OF OKLAHOMA
Related Party Transaction [Line Items]
Related party transaction, amount	$ 13,000,000
Transmission Revenues \| Related Party
Related Party Transaction [Line Items]
Costs allocation, average period		12 months