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CAPITALIZATION - Long-term Debt Redemption and Issuance (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2024
Dec. 31, 2024
Nov. 30, 2024
Sep. 30, 2024
Aug. 31, 2024
May 31, 2024
Apr. 30, 2024
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 05, 2024
Sep. 05, 2024
Debt Instrument [Line Items]                          
Debt issuances                 $ 2,100 $ 3,150 $ 700    
Repayments of debt                 $ 2,760 $ 537 $ 3,005    
7.375% Unsecured Notes Due April, 2034 | Unsecured Notes | FE                          
Debt Instrument [Line Items]                          
Issuance interest rate 7.375%           7.375%            
Repayments of debt             $ 463            
Make-whole premium $ 80           80            
Losses on deferred cash flows 4                        
Losses on deferred cash flows, net 3                        
Unamortized debt issuance expense 1           1            
Make-whole premium, net $ 63           $ 63            
4.70% Secured Senior Notes Maturing 2024 | Unsecured Notes | JCP&L                          
Debt Instrument [Line Items]                          
Issuance interest rate 4.70%           4.70%            
Repayments of debt             $ 500            
4.10% Secured Senior Notes Maturing 2024 | First Mortgage Bond | MP                          
Debt Instrument [Line Items]                          
Issuance interest rate 4.10%           4.10%            
Repayments of debt             $ 400            
5.50% Unsecured Senior Notes Maturing 2024 | First Mortgage Bond | CEI                          
Debt Instrument [Line Items]                          
Issuance interest rate         5.50%                
Repayments of debt         $ 300                
4.00% Unsecured Senior Notes Maturing 2025 | Unsecured Notes | FE PA                          
Debt Instrument [Line Items]                          
Issuance interest rate   4.00%             4.00%        
Repayments of debt   $ 250                      
4.15% Unsecured Senior Notes Maturing 2025 | Unsecured Notes | FE PA                          
Debt Instrument [Line Items]                          
Issuance interest rate   4.15%             4.15%        
Repayments of debt   $ 200                      
4.35% Unsecured Senior Notes Maturing 2025 | Unsecured Notes | FET                          
Debt Instrument [Line Items]                          
Issuance interest rate   4.35%   4.35%         4.35%        
Repayments of debt   $ 600   $ 600                  
5.63% Secured Senior Notes Maturing 2034 | Unsecured Notes | ATSI                          
Debt Instrument [Line Items]                          
Issuance interest rate               5.63%          
Debt issuances               $ 150          
5.94% Secured Senior Notes Maturing 2031 | Unsecured Notes | MAIT                          
Debt Instrument [Line Items]                          
Issuance interest rate           5.94%              
Debt issuances           $ 250              
4.55% Unsecured Senior Notes Maturing 2031 | Unsecured Notes | FET                          
Debt Instrument [Line Items]                          
Issuance interest rate       4.55%                  
Face amount of loan                         $ 400
Debt issuances       $ 400                  
5.15%, 300 Million Notes Maturing 2026 | Unsecured Notes | FET                          
Debt Instrument [Line Items]                          
Issuance interest rate       5.00%                  
Debt issuances       $ 400                  
5.15%, 300 Million Notes Maturing 2026 | Senior Notes | FET                          
Debt Instrument [Line Items]                          
Face amount of loan                         $ 400
5.17% Unsecured Senior Notes Maturing 2035 | Unsecured Notes | KATCo                          
Debt Instrument [Line Items]                          
Issuance interest rate     5.17%                    
Debt issuances     $ 200                    
5.10% Unsecured Senior Notes Maturing 2035 | Unsecured Notes | JCP&L                          
Debt Instrument [Line Items]                          
Issuance interest rate   5.10%             5.10%        
Face amount of loan                       $ 700  
Debt issuances   $ 700