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ORGANIZATION AND BASIS OF PRESENTATION - Narrative (Details)
customer in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Jul. 17, 2024
USD ($)
Mar. 25, 2024
USD ($)
promissoryNote
May 31, 2022
USD ($)
Dec. 31, 2024
USD ($)
mi²
transmissionCenter
MW
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
mi²
customer
transmissionCenter
MW
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Mar. 31, 2024
Sep. 30, 2023
USD ($)
Feb. 02, 2023
USD ($)
director
Regulatory Assets [Line Items]                      
Number of customers | customer           6.0          
Number of regional transmission centers | transmissionCenter       2   2          
Impairment of long-lived assets to be disposed of         $ 62            
FET equity interest sale, net of transaction costs           $ 2,665   $ 2,338      
Regulatory assets currently being recovered through deferred returns       $ 698   698 $ 371        
Equity method investment earnings, net (Note 1)           $ 58 $ 175 $ 168      
Public utilities, property, plant and equipment, disclosure of composite depreciation rate for plants in service           2.90% 2.80% 2.70%      
Capitalized financing costs           $ 60 $ 44 $ 56      
Interest costs capitalized           $ 73 53 28      
VIRGINIA                      
Regulatory Assets [Line Items]                      
Plant generation capacity (in MW's) | MW       3,003   3,003          
Revision of Prior Period, Adjustment                      
Regulatory Assets [Line Items]                      
Deferred tax assets, valuation allowance                   $ 21  
NCI                      
Regulatory Assets [Line Items]                      
FET equity interest sale, net of transaction costs           $ 731   451      
OPIC                      
Regulatory Assets [Line Items]                      
FET equity interest sale, net of transaction costs           $ 1,934   $ 1,887      
FET                      
Regulatory Assets [Line Items]                      
Noncontrolling interest ownership percentage       49.90%   49.90%          
Brookfield II | FET                      
Regulatory Assets [Line Items]                      
Sale of ownership interest by parent                     30.00%
Number of promissory notes | promissoryNote   2                  
Noncontrolling interest ownership percentage                     49.90%
Integrated                      
Regulatory Assets [Line Items]                      
Service area | mi²       24,000   24,000          
Integrated Segment                      
Regulatory Assets [Line Items]                      
Plant generation capacity (in MW's) | MW       3,604   3,604          
Integrated                      
Regulatory Assets [Line Items]                      
Number of customers | customer           2.0          
Impairment of long-lived assets to be disposed of         17            
Distribution Segment                      
Regulatory Assets [Line Items]                      
Number of customers | customer           4.3          
Plant generation capacity (in MW's) | MW       3,604   3,604          
Impairment of long-lived assets to be disposed of         31            
Property, plant and equipment, net       $ 2,300   $ 2,300          
Stand-Alone Transmission                      
Regulatory Assets [Line Items]                      
Impairment of long-lived assets to be disposed of         11            
Corporate/Other                      
Regulatory Assets [Line Items]                      
Impairment of long-lived assets to be disposed of         $ 3            
FET                      
Regulatory Assets [Line Items]                      
Net of transaction costs     $ 37     32          
Net of taxes           $ 803          
Number of directors | director                     5
Consolidation, less than wholly owned subsidiary, parent ownership interest, changes, carrying value of noncontrolling interest     $ 451                
FET | FE                      
Regulatory Assets [Line Items]                      
Number of directors | director                     3
FET | Brookfield II                      
Regulatory Assets [Line Items]                      
Sale of ownership interest by parent   49.90% 19.90% 19.90%   19.90%   19.90% 19.90%    
Consideration                     $ 3,500
Number of directors | director                     2
Brookfield | Brookfield II                      
Regulatory Assets [Line Items]                      
Interest income, operating           $ 24          
Brookfield | Brookfield II | FET                      
Regulatory Assets [Line Items]                      
Liabilities incurred $ 1,200 $ 1,200                  
Payments to acquire businesses, gross           $ 2,300          
Brookfield | Brookfield II | FET | Promissory Note, $750 Million at 5.75% Due September 2025                      
Regulatory Assets [Line Items]                      
Face amount of loan   $ 750                  
Interest rate (percent)   5.75%                  
Brookfield | Brookfield II | FET | Promissory Note, $450 Million at 7.75% Due September 2025                      
Regulatory Assets [Line Items]                      
Face amount of loan   $ 450                  
Interest rate (percent)   7.75%                  
AGC | VIRGINIA                      
Regulatory Assets [Line Items]                      
Plant generation capacity (in MW's) | MW       487   487          
Proportionate ownership share       16.25%   16.25%          
Property, plant and equipment       $ 142   $ 142          
Virginia Electric and Power Company | VIRGINIA                      
Regulatory Assets [Line Items]                      
Proportionate ownership share       60.00%   60.00%          
FET | FE                      
Regulatory Assets [Line Items]                      
Equity method investment, ownership percentage                     50.10%
Global Holding                      
Regulatory Assets [Line Items]                      
Equity method investments       $ 45   $ 45 66        
Global Holding | FEV | Variable Interest Entity, Not Primary Beneficiary                      
Regulatory Assets [Line Items]                      
Proceeds from dividends received           80 165        
Global Holding | FEV | Corporate/Other | Other Nonoperating Income (Expense)                      
Regulatory Assets [Line Items]                      
Equity method investment earnings, net (Note 1)           72 175 $ 168      
Other Sundry Investments                      
Regulatory Assets [Line Items]                      
Equity method investments       84   84 104        
Path-WV | Variable Interest Entity, Not Primary Beneficiary                      
Regulatory Assets [Line Items]                      
Equity method investments       $ 17   $ 17 $ 17        
Variable interest entities percentage of high voltage transmission line project owned by variable interest entity one in joint venture party one       100.00%   100.00%          
Variable interest entities percentage of high voltage transmission line project owned by variable interest entity one in joint venture party two       50.00%   50.00%          
Signal Peak                      
Regulatory Assets [Line Items]                      
Impairment of equity method investments       $ 13              
Signal Peak | Global Holding | FEV                      
Regulatory Assets [Line Items]                      
Equity method investment, ownership percentage       33.33%   33.33%