v3.26.1
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, 2026
Dec. 31, 2025
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance $ 57  
Ending balance 48 $ 57
Deferred refunded to customer 11 31
Customer    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance   55
Provision for expected credit losses 41 94
Charged to other accounts 24 37
Write-offs (74) (129)
JCP&L    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance 6  
Ending balance 5 6
JCP&L | Customer    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance   6
Provision for expected credit losses 2 8
Charged to other accounts 3 3
Write-offs $ (6) $ (11)