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REVENUE - Schedule of Activity in the Allowance for Uncollectible Accounts on Customer Receivables (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance $ 55 $ 64
Provision for expected credit losses 44 73
Charged to other accounts 18 39
Write-offs (67) (121)
Ending balance 50 55
Deferred refunded to customer 15 17
JERSEY CENTRAL POWER & LIGHT COMPANY    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance 6 9
Provision for expected credit losses 2 5
Charged to other accounts 2 4
Write-offs (5) (12)
Ending balance 5 6
Deferred refunded to customer $ 2 $ 5