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Discontinued Operations - Narrative (Details)
$ in Millions
 1 Months Ended 3 Months Ended
Feb. 27, 2020
USD ($)
Feb. 18, 2020
USD ($)
Sep. 30, 2018
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
MW
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Short-term borrowings       $ 750   $ 1,000
Worthless stock deduction $ 4,900          
Unrecognized tax benefits from worthless stock deduction 316          
Worthless stock deduction, net of tax 1,000          
Unrecognized tax benefits from worthless stock deduction, net of tax 72          
Current assets - discontinued operations       0   $ 33
Discontinued operations, net of tax [1]       50 $ (35)  
Pleasants Power Station | AE Supply | Purchase Agreement with Subsidiary of LS Power            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Plant capacity (in MW's) | MW           1,300
Promissory Notes | AE Supply | FES and FENOC            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Outstanding borrowings 102          
Revolving Credit Facility | Line of Credit | FES            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Line of credit outstanding 500          
Money Pool | Adjustment | FES and FENOC            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Short-term borrowings 92          
Discontinued Operations, Disposed of by Means Other than Sale | FES and FENOC            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Discontinued operations, net of tax       50 (35)  
Disposed of by Sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from asset sales       65    
FES Key Creditor Groups [Member] | Affiliated Companies | FES            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Settlement of certain claims     $ 853      
Settlement of claims upon emergence 853          
Services Agreements | Affiliated Companies | Discontinued Operations, Disposed of by Means Other than Sale | FES | FES and FENOC            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Amounts of transaction       34 35  
Benefit Obligations | Affiliated Companies | Discontinued Operations, Disposed of by Means Other than Sale | FES | FES and FENOC            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Amounts of transaction       6 10  
Power Purchase Agreements | Affiliated Companies | Discontinued Operations, Disposed of by Means Other than Sale | FES | FES and FENOC            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Purchases from related party       $ 17 $ 83  
IT Access Agreement [Member] | Affiliated Companies | FES            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Settlement of certain claims   $ 125        
Settlement of claims upon emergence 125          
State and Local Jurisdiction            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Worthless stock deduction, net of tax $ 83          
[1] Net of income tax expense (benefits) of $(36) million and $5 million for the three months ended March 31, 2020 and 2019, respectively.