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ORGANIZATION AND BASIS OF PRESENTATION - Narrative (Details)
customer in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
mi²
entity
customer
transmission_center
agreement
company
MW
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
MW
shares
Jun. 30, 2013
USD ($)
Regulatory Assets [Line Items]        
Concentration of risk of accounts receivable $ 0 $ 0    
Increase (decrease) in allowance for credit loss, 121,000,000      
Regulatory assets based on prior precedent or anticipated recovery based on rate making premises with specific order 117,000,000 111,000,000    
Regulatory assets being sought for recovery in a formula rate amendment $ 79,000,000 $ 73,000,000    
Annual composite depreciation rate 2.70% 2.70% 2.60%  
Capitalized financing costs $ 49,000,000 $ 45,000,000 $ 46,000,000  
Interest costs capitalized 28,000,000 26,000,000 19,000,000  
Property, plant and equipment $ 33,294,000,000 31,650,000,000    
Number of contracts that may contain variable interest | entity 1      
Purchased power $ 2,701,000,000 2,927,000,000 $ 3,109,000,000  
Number of regional transmission centers | transmission_center 2      
Regulatory assets currently being recovered through deferred returns $ 195,000,000 228,000,000    
Power Purchase Agreements        
Regulatory Assets [Line Items]        
Ownership interest 0.00%      
Number of long term power purchase agreements maintained by parent company with Non utility generation entities | agreement 6      
Global Holding        
Regulatory Assets [Line Items]        
Equity method investments $ 30,000,000      
Path-WV | Variable Interest Entity, Not Primary Beneficiary        
Regulatory Assets [Line Items]        
Equity method investments $ 18,000,000      
Percentage of high-voltage transmission line project owned by subsidiary of FE on the Allegheny Series 100.00%      
Percentage of high-voltage transmission line project owned by subsidiary of AE on the West Virginia Series 50.00%      
Phase In Recovery Bonds        
Regulatory Assets [Line Items]        
Long-term debt and other long-term obligations $ 245,000,000 268,000,000    
Line of Credit | Term Loan Facility Due March 2020 | Global Holding        
Regulatory Assets [Line Items]        
Face amount of loan 120,000,000      
Line of Credit | Revolving Credit Facility        
Regulatory Assets [Line Items]        
Maximum amount borrowed under revolving credit facility $ 3,500,000,000      
Ohio Funding Companies | Phase In Recovery Bonds        
Regulatory Assets [Line Items]        
Face amount of loan       $ 445,000,000
FEV | Signal Peak | Global Holding        
Regulatory Assets [Line Items]        
Ownership interest 33.33%      
Global Holding | Senior Loans | Senior Secured Term Loan        
Regulatory Assets [Line Items]        
Long-term debt and other long-term obligations $ 108,000,000      
Other FE subsidiaries | Power Purchase Agreements        
Regulatory Assets [Line Items]        
Purchased power $ 113,000,000 $ 116,000,000    
Bath County, Virginia        
Regulatory Assets [Line Items]        
Plant generation capacity (in MW's) | MW 3,003      
Bath County, Virginia | AGC        
Regulatory Assets [Line Items]        
Proportionate ownership share 16.25%      
Plant generation capacity (in MW's) | MW 487      
Property, plant and equipment $ 157,000,000      
Bath County, Virginia | Virginia Electric and Power Company        
Regulatory Assets [Line Items]        
Proportionate ownership share 60.00%      
Utilities and FET        
Regulatory Assets [Line Items]        
Property, plant and equipment, net $ 2,100,000,000      
Plant generation capacity (in MW's) | MW 3,790      
Number of existing utility operating companies | company 10      
Number of customers served by utility operating companies | customer 6      
Service Area | mi² 65,000      
Utilities and FET | Yard's Creek Energy, LLC Hydro Generation Facility        
Regulatory Assets [Line Items]        
Plant generation capacity (in MW's) | MW 210      
Regulated Transmission        
Regulatory Assets [Line Items]        
Service Area | mi² 24,500      
Pleasants Power Station | AE Supply | Purchase Agreement with Subsidiary of LS Power        
Regulatory Assets [Line Items]        
Plant generation capacity (in MW's) | MW     1,300  
Disposal Group, Held-for-sale | TMI-2 | Utilities and FET        
Regulatory Assets [Line Items]        
Assets held-for-sale $ 882,000,000      
Stock Options        
Regulatory Assets [Line Items]        
Antidilutive securities excluded from computation of EPS (in shares) | shares 80,000 0 1,000,000  
Future Recovery of Incremental Costs        
Regulatory Assets [Line Items]        
Increase (decrease) in allowance for credit loss, $ 90,000,000