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REVENUE - Schedule of Activity in the Allowance for Uncollectible Accounts on Customer Receivables (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance $ 55 $ 64
Provision for expected credit losses 64 73
Charged to other accounts 28 39
Write-offs (92) (121)
Ending balance 55 55
Deferred refunded to customer 25 17
JERSEY CENTRAL POWER & LIGHT COMPANY    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance 6 9
Provision for expected credit losses 6 5
Charged to other accounts 2 4
Write-offs (8) (12)
Ending balance 6 6
Deferred refunded to customer $ 6 $ 5