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VARIABLE INTEREST ENTITIES - Narrative (Details)
$ in Millions
Mar. 31, 2024
USD ($)
subsidiary
agreement
Dec. 31, 2023
USD ($)
Feb. 02, 2023
Jun. 30, 2013
USD ($)
Variable Interest Entities (Textuals) [Abstract]        
Assets $ 51,299 $ 48,767    
Liabilities $ 37,686 37,851    
Number of subsidiaries that issued environmental control bonds | subsidiary 2      
Long-term pollution control bond $ 203 218    
Restricted cash $ 27 42    
Number of long-term purchase power agreements | agreement 4      
FET        
Variable Interest Entities (Textuals) [Abstract]        
Noncontrolling interest, ownership percentage by noncontrolling owners 49.90%      
Phase In Recovery Bonds        
Variable Interest Entities (Textuals) [Abstract]        
Long-term debt and other long-term obligations $ 183 191    
Variable Interest Entity, Primary Beneficiary        
Variable Interest Entities (Textuals) [Abstract]        
Assets 11,131 10,984    
Liabilities $ 7,798 7,426    
FE | FET        
Variable Interest Entities (Textuals) [Abstract]        
Ownership percentage by parent 50.10%      
Minority interest ownership percentage sold percentage     0.30  
FE | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entities (Textuals) [Abstract]        
Assets $ 11,156 11,024    
Liabilities 8,184 7,835    
Ohio Funding Companies | Phase In Recovery Bonds        
Variable Interest Entities (Textuals) [Abstract]        
Face amount of debt       $ 445
MP, PE and the Ohio Companies        
Variable Interest Entities (Textuals) [Abstract]        
Restricted cash $ 25 $ 40