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FAIR VALUE MEASUREMENTS - Schedule of Long Term Debt Redemption and Issuance (Details) - USD ($)
$ in Millions
1 Months Ended
May 04, 2023
May 31, 2023
Apr. 30, 2023
Mar. 31, 2023
Feb. 28, 2023
Jan. 31, 2023
Debt Instrument [Line Items]            
Losses on deferred cash flows   $ 2        
Losses on deferred cash flows, net   1        
4.00%, 1,300 Million Notes Maturity 2026            
Debt Instrument [Line Items]            
Proceeds from issuance of debt $ 1,480          
Senior Notes            
Debt Instrument [Line Items]            
Early repayment of debt   194        
Make-whole premium   34        
Make-whole premium, net   27        
Senior Notes | 7.375% Secured Senior Notes Maturing 2031            
Debt Instrument [Line Items]            
Long-term debt and other long-term obligations   $ 228        
ME | Promissory Notes | 3.50% Series B Senior Notes Due 2023            
Debt Instrument [Line Items]            
Issuance interest rate       3.50%    
Face amount of debt       $ 300    
ME | Promissory Notes | 3.50% Series B Senior Notes Due 2023 | Revolving Credit Facility            
Debt Instrument [Line Items]            
Issuance interest rate       3.50%    
Face amount of debt       $ 300    
ME | Promissory Notes | 5.20%, 425 Million Notes Maturing 2028            
Debt Instrument [Line Items]            
Issuance interest rate       5.20%    
Face amount of debt       $ 425    
FE | Promissory Notes | 7.375% Secured Senior Notes Maturing 2031            
Debt Instrument [Line Items]            
Issuance interest rate   7.375%        
Face amount of debt   $ 194        
FE | Promissory Notes | 4.00%, 1,300 Million Notes Maturity 2026            
Debt Instrument [Line Items]            
Issuance interest rate 4.00%          
Face amount of debt $ 1,500          
WP | First Mortgage Bond | 5.29%, 50 Million Notes Maturing 2023            
Debt Instrument [Line Items]            
Issuance interest rate           5.29%
Face amount of debt           $ 50
MAIT | Promissory Notes | 5.39%, 175 Million Notes Maturing 2023            
Debt Instrument [Line Items]            
Issuance interest rate         5.39%  
Face amount of debt         $ 175  
PN | Promissory Notes | 5.15%, 300 Million Notes Maturing 2026            
Debt Instrument [Line Items]            
Issuance interest rate       5.15%    
Face amount of debt       $ 300    
ATSI | Promissory Notes | 5.13%, 150 Million Notes Maturity 2033            
Debt Instrument [Line Items]            
Issuance interest rate     5.13%      
Face amount of debt     $ 150