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RELATED PARTY TRANSACTIONS - Narrative (Details)	5 Months Ended	12 Months Ended
RELATED PARTY TRANSACTIONS - Narrative (Details)	Dec. 31, 2024 USD ($)	Dec. 31, 2025 USD ($) company state	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Aug. 31, 2023
Related Party Transaction [Line Items]
Number of states within service area \| state		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
Joint License Agreement \| AEPTCo
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 \| I&M
Related Party Transaction [Line Items]
Purchases from related party		$ 268,000,000	$ 209,000,000	$ 181,000,000
Ohio Auction SSO Load Delivery Purchases from Affiliates \| OPCo
Related Party Transaction [Line Items]
Purchases from related party		65,000,000	98,000,000	87,000,000
Clean Affordable Reliable Coalition (CARE)
Related Party Transaction [Line Items]
Related party transaction, amount		0	$ 0	80,000
Vendor Purchases
Related Party Transaction [Line Items]
Related party transaction, amount	$ 44,000,000	$ 0
Vendor Purchases \| AEP Texas
Related Party Transaction [Line Items]
Related party transaction, amount	25,000,000
Vendor Purchases \| PSO
Related Party Transaction [Line Items]
Related party transaction, amount	$ 13,000,000
Power Purchased From Affiliates \| I&M \| G&M
Related Party Transaction [Line Items]
Related party transaction, amount				8,000,000
Power Purchased From Affiliates \| OPCo \| G&M
Related Party Transaction [Line Items]
Related party transaction, amount				$ 16,000,000
Transmission Revenues \| Related Party
Related Party Transaction [Line Items]
Costs allocation, average period		12 months