v3.25.1
REVENUE - Schedule of Activity in the Allowance for Uncollectible Accounts on Customer Receivables (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance $ 55 $ 64
Provision for expected credit losses 24 73
Charged to other accounts 9 39
Write-offs (38) (121)
Ending balance 50 55
Deferred refunded to customer 6 17
JERSEY CENTRAL POWER & LIGHT COMPANY    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance 6 9
Provision for expected credit losses 1 5
Charged to other accounts 1 4
Write-offs (3) (12)
Ending balance 5 6
Deferred refunded to customer $ 1 $ 5