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FAIR VALUE MEASUREMENTS - Schedule of Long-term Debt Redemption and Issuance (Details) - USD ($)
$ in Millions
Apr. 30, 2024
Sep. 30, 2024
Sep. 05, 2024
Aug. 31, 2024
May 31, 2024
Mar. 31, 2024
Senior Notes            
Debt Instrument [Line Items]            
Unamortized debt issuance expense $ 1          
Senior Notes | FET            
Debt Instrument [Line Items]            
Face amount of debt     $ 800      
7.38% Secured Senior Notes Maturing 2031 | Unsecured Notes | FE            
Debt Instrument [Line Items]            
Issuance interest rate 7.375%          
Face amount of debt $ 463          
Make-whole premium 80          
Make-whole premium, net 63          
Losses on deferred cash flows 4          
Losses on deferred cash flows, net $ 3          
4.70% Secured Senior Notes Maturing 2024 | Unsecured Notes | JCP&L            
Debt Instrument [Line Items]            
Issuance interest rate 4.70%          
Face amount of debt $ 500          
4.10% Secured Senior Notes Maturing 2024 | First Mortgage Bond | MP            
Debt Instrument [Line Items]            
Issuance interest rate 4.10%          
Face amount of debt $ 400          
5.50% Unsecured Senior Notes Maturing 2024 | First Mortgage Bond | CEI            
Debt Instrument [Line Items]            
Issuance interest rate       5.50%    
Face amount of debt       $ 300    
5.63% Secured Senior Notes Maturing 2034 | Unsecured Notes | ATSI            
Debt Instrument [Line Items]            
Issuance interest rate           5.63%
Face amount of debt           $ 150
5.94% Secured Senior Notes Maturing 2031 | Unsecured Notes | MAIT            
Debt Instrument [Line Items]            
Issuance interest rate         5.94%  
Face amount of debt         $ 250  
4.55% Unsecured Senior Notes Maturing 2031 | Unsecured Notes | FET            
Debt Instrument [Line Items]            
Issuance interest rate   4.55%        
Face amount of debt   $ 400        
4.55% Unsecured Senior Notes Maturing 2031 | Unsecured Notes | FET | Revolving Credit Facility            
Debt Instrument [Line Items]            
Issuance interest rate   4.35%        
Face amount of debt   $ 600        
5.15%, 300 Million Notes Maturing 2026 | Unsecured Notes | FET            
Debt Instrument [Line Items]            
Issuance interest rate   5.00%        
Face amount of debt   $ 400        
5.15%, 300 Million Notes Maturing 2026 | Unsecured Notes | FET | Revolving Credit Facility            
Debt Instrument [Line Items]            
Issuance interest rate   4.35%        
Face amount of debt   $ 600