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VARIABLE INTEREST ENTITIES - Narrative (Details)
$ in Millions
Sep. 30, 2025
USD ($)
subsidiary
agreement
Jul. 31, 2025
Jul. 16, 2025
Dec. 31, 2024
USD ($)
Jun. 30, 2013
USD ($)
Variable Interest Entity [Line Items]          
Assets $ 55,884     $ 52,044  
Liabilities $ 41,700     38,324  
Number of subsidiaries that issued environmental control bonds | subsidiary 2        
Long-term pollution control bond $ 156     188  
Restricted cash $ 27     43  
Number of long-term purchase power agreements | agreement 6        
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 $ 159     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 $ 25     40  
JERSEY CENTRAL POWER & LIGHT COMPANY          
Variable Interest Entity [Line Items]          
Assets 11,490     9,927  
Liabilities $ 6,394     4,950  
Number of long-term purchase power agreements | agreement 1        
FEV | Global Holding          
Variable Interest Entity [Line Items]          
Investment ownership percentage   33.33% 33.33%    
Variable Interest Entity, Primary Beneficiary          
Variable Interest Entity [Line Items]          
Assets $ 12,822     11,936  
Liabilities 9,379     8,706  
Variable Interest Entity, Primary Beneficiary | FE          
Variable Interest Entity [Line Items]          
Assets 12,800     12,000  
Liabilities $ 9,700     $ 9,100