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Discontinued Operations - Narrative (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
May 03, 2018
Mar. 16, 2018
USD ($)
Mar. 09, 2018
USD ($)
MW
Aug. 31, 2017
Natural_gas_plant
MW
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Short-term borrowings           $ 1,250,000,000 $ 1,000,000,000 $ 1,250,000,000  
Interest expense             1,033,000,000 1,116,000,000 $ 1,005,000,000
Increase in uncertain tax positions             22,000,000 125,000,000 2,000,000
Current assets - discontinued operations           25,000,000 33,000,000 25,000,000  
Purchase Agreement with Subsidiary of LS Power                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Plant generation capacity (in MW's) | MW       1,615          
AE Supply | Purchase Agreement with Subsidiary of LS Power                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Number of gas generating plants | Natural_gas_plant       4          
AGC | Purchase Agreement with Subsidiary of LS Power                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Ownership percentage 59.00%     59.00%          
Bay Shore Unit 1 | Asset Purchase Agreement with Walleye Energy, LLC                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Plant capacity (in MW's) | MW     136            
Promissory Notes | FES and FENOC                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Interest expense             33,000,000 24,000,000  
Promissory Notes | AE Supply | FES and FENOC                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Outstanding borrowings   $ 102,000,000     $ 102,000,000        
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     $ 500,000,000       500,000,000    
Loan reserves         500,000,000        
Money Pool | FES and FENOC                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Amount added to debt   88,000,000              
Short-term borrowings   $ 92,000,000              
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]                  
Investments in subsidiaries         0   0    
Gain on deconsolidation, net of tax             59,000,000 435,000,000 $ 0
Assumption of benefit obligations retained at FE (including Pension, OPEB and EDCP)         (820,000,000)   0 820,000,000  
Expenses from transactions with related parties             37,000,000 42,000,000  
Worthless stock deduction             4,800,000,000    
Worthless stock deduction, net of tax             1,000,000,000.0    
Tax consequence of outside basis difference             448,000,000    
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]                  
Tax effect of discontinued operation due to tax cuts             54,000,000 60,000,000  
Increase in uncertain tax positions             14,000,000 27,000,000  
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           $ 112,500,000 152,000,000    
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]                  
Due from related parties             10,000,000    
Purchases from related party             171,000,000 $ 318,000,000  
Tax Allocation Agreement | Affiliated companies | 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]                  
Due from related parties             $ 94,000,000    
FE | Promissory Notes | FES and FENOC                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Loan reserves         102,000,000        
FE | Unregulated Money Pool | FES and FENOC                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Loan reserves         $ 92,000,000