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VARIABLE INTEREST ENTITIES - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
subsidiary
agreement
Dec. 31, 2023
USD ($)
Feb. 02, 2023
Jun. 30, 2013
USD ($)
Business Acquisition [Line Items]        
Total Assets $ 52,044 $ 48,767    
Liabilities $ 38,324 37,851    
Number of subsidiaries that issued environmental control bonds | subsidiary 2      
Environmental control bonds outstanding $ 188 218    
Restricted cash $ 43 42    
Power Purchase Agreements        
Business Acquisition [Line Items]        
Number of long term power purchase agreements maintained by parent company with non utility generation entities | agreement 4      
Power Purchase Agreements | Global Holding And PATH WV        
Business Acquisition [Line Items]        
Equity method investment, ownership percentage 0.00%      
FET        
Business Acquisition [Line Items]        
Noncontrolling interest ownership percentage 49.90%      
Phase In Recovery Bonds        
Business Acquisition [Line Items]        
Long-term debt and other long-term obligations $ 175 191    
FE | FET        
Business Acquisition [Line Items]        
Minority interest ownership percentage sold percentage     0.30  
Ownership percentage by parent 50.10%      
Ohio Funding Companies | Phase In Recovery Bonds        
Business Acquisition [Line Items]        
Face amount of loan       $ 445
MP, PE and the Ohio Companies        
Business Acquisition [Line Items]        
Restricted cash $ 40 40    
Variable Interest Entity, Primary Beneficiary        
Business Acquisition [Line Items]        
Total Assets 11,936 10,984    
Liabilities 8,706 7,426    
Variable Interest Entity, Primary Beneficiary | FE        
Business Acquisition [Line Items]        
Total Assets 12,000 11,000    
Liabilities $ 9,100 $ 7,800