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ORGANIZATION AND BASIS OF PRESENTATION - Narrative (Details)
$ in Millions
3 Months Ended
Mar. 25, 2024
USD ($)
promissoryNote
May 31, 2022
USD ($)
Mar. 31, 2024
USD ($)
mi²
customer
transmissionCenter
MW
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Feb. 02, 2023
USD ($)
Property, Plant and Equipment [Line Items]            
Number of customers | customer     6,000,000      
Number of regional transmission centers | transmissionCenter     2      
carrying value of the NCI     $ 2,673      
Capitalized cost of equity     13 $ 8    
Capitalized interest     17 13    
Equity method investment earnings (Note 1)     21 56    
NCI            
Property, Plant and Equipment [Line Items]            
carrying value of the NCI     731      
OPIC            
Property, Plant and Equipment [Line Items]            
carrying value of the NCI     $ 1,942      
Distribution Segment            
Property, Plant and Equipment [Line Items]            
Number of customers | customer     4,200,000      
Plant capacity (in MW's) | MW     3,599      
Regulated Transmission            
Property, Plant and Equipment [Line Items]            
Service area | mi²     24,000      
FET            
Property, Plant and Equipment [Line Items]            
Noncontrolling interest, ownership percentage by noncontrolling owners     49.90%      
FET            
Property, Plant and Equipment [Line Items]            
Net of transaction costs   $ 30        
Net of taxes   $ 797        
FE PA            
Property, Plant and Equipment [Line Items]            
Number of customers | customer     4,500,000      
North American Transmission Company II LLC | FET            
Property, Plant and Equipment [Line Items]            
Sale of ownership interest by parent           30.00%
Number of promissory notes | promissoryNote 2          
Noncontrolling interest, ownership percentage by noncontrolling owners           49.90%
North American Transmission Company II LLC | FET            
Property, Plant and Equipment [Line Items]            
Sale of ownership interest by parent 49.90% 19.90%        
Consideration           $ 3,500
North American Transmission Company II LLC | Brookfield | FET            
Property, Plant and Equipment [Line Items]            
Business combination, consideration transferred, liabilities incurred $ 1,200          
Cash paid in acquisition 2,300          
North American Transmission Company II LLC | Brookfield | FET | Promissory Note, $750 Million at 5.575% Due September 2025            
Property, Plant and Equipment [Line Items]            
Face amount of debt $ 750          
Issuance interest rate 5.75%          
North American Transmission Company II LLC | Brookfield | FET | Promissory Note, $450 Million at 7.75% Due September 2025            
Property, Plant and Equipment [Line Items]            
Face amount of debt $ 450          
Issuance interest rate 7.75%          
Global Holding            
Property, Plant and Equipment [Line Items]            
Equity method investments     $ 87   $ 66  
Global Holding | FEV            
Property, Plant and Equipment [Line Items]            
Investment ownership percentage     33.30%      
Global Holding | FEV | Variable Interest Entity, Not Primary Beneficiary            
Property, Plant and Equipment [Line Items]            
Proceeds from dividends received       60    
Global Holding | FEV | Corporate and Other | Other Nonoperating Income (Expense)            
Property, Plant and Equipment [Line Items]            
Equity method investment earnings (Note 1)     $ 21 $ 54    
FET | FE            
Property, Plant and Equipment [Line Items]            
Equity method investment, ownership percentage           50.10%
Other Sundry Investments            
Property, Plant and Equipment [Line Items]            
Equity method investments     126   104  
Path Wv | Variable Interest Entity, Not Primary Beneficiary            
Property, Plant and Equipment [Line Items]            
Equity method investments     $ 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%      
Variable interest entities percentage of high voltage transmission line project owned by variable interest entity one in joint venture party two     50.00%