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VARIABLE INTEREST ENTITIES - Narrative (Details)
$ in Millions
Jun. 30, 2025
USD ($)
agreement
subsidiary
Dec. 31, 2024
USD ($)
Jun. 30, 2013
USD ($)
Variable Interest Entity [Line Items]      
Assets $ 54,230 $ 52,044  
Liabilities $ 40,059 38,324  
Number of subsidiaries that issued environmental control bonds | subsidiary 2    
Long-term pollution control bond $ 172 188  
Restricted cash $ 45 43  
Number of long-term purchase power agreements | agreement 4    
FET      
Variable Interest Entity [Line Items]      
Noncontrolling interest, ownership percentage by noncontrolling owners 49.90%    
Phase In Recovery Bonds      
Variable Interest Entity [Line Items]      
Long-term debt $ 167 175  
FE | FET      
Variable Interest Entity [Line Items]      
Ownership percentage by parent 50.10%    
Ohio Funding Companies | Phase In Recovery Bonds      
Variable Interest Entity [Line Items]      
Face amount of debt     $ 445
MP, PE and the Ohio Companies      
Variable Interest Entity [Line Items]      
Restricted cash $ 41 40  
JERSEY CENTRAL POWER & LIGHT COMPANY      
Variable Interest Entity [Line Items]      
Assets 10,450 9,927  
Liabilities $ 5,385 4,950  
Number of long-term purchase power agreements | agreement 1    
Variable Interest Entity, Primary Beneficiary      
Variable Interest Entity [Line Items]      
Assets $ 12,422 11,936  
Liabilities 9,164 8,706  
Variable Interest Entity, Primary Beneficiary | FE      
Variable Interest Entity [Line Items]      
Assets 12,500 12,000  
Liabilities $ 9,500 $ 9,100