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Pension and Other Postemployment Benefits (Details Textuals)
$ in Millions
 1 Months Ended 9 Months Ended 12 Months Ended
Feb. 01, 2019
USD ($)
Dec. 13, 2016
USD ($)
Jan. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
employee
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Increase in Discount Rate         0.69%    
Mark-to-market adjustment, net of capitalized amounts         $ 145 $ 141 $ 147
Funding contributions made for current and future years     $ 750       882
Pension contributions   $ 500     1,250 0 382
Pensions and OPEB              
Defined Benefit Plan Disclosure [Line Items]              
Actual return on plan assets         $ (371) $ 999 $ 472
Actual return on plan assets (percent)         (4.00%) 15.10% 8.20%
Expected return on plan assets         $ 605 $ 478 $ 429
Pension              
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)         287 265 $ 377
Company contributions         1,270 18  
Actual return on plan assets         $ (363) $ 950  
Expected long-term return on plan assets         7.50% 7.50% 7.50%
Expected return on plan assets         $ 574 $ 448 $ 399
Increase in benefit obligation due to RP2014 mortality table         16    
Excluded from total investments         68 (10)  
OPEB              
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)         (156) (66) $ (60)
Company contributions         22 16  
Actual return on plan assets         $ (8) $ 49  
Expected long-term return on plan assets         7.50% 7.50% 7.50%
Expected return on plan assets         $ 31 $ 30 $ 30
Excluded from total investments         (2) (2)  
Minimum              
Defined Benefit Plan Disclosure [Line Items]              
Company contributions     $ 500       382
FES              
Defined Benefit Plan Disclosure [Line Items]              
Pension contributions             138
Subsequent Event              
Defined Benefit Plan Disclosure [Line Items]              
Company contributions $ 500            
Discontinued Operations              
Defined Benefit Plan Disclosure [Line Items]              
Mark-to-market adjustment, net of capitalized amounts         $ 1 39 $ 45
FE Tomorrow Initiative              
Defined Benefit Plan Disclosure [Line Items]              
Restructuring and Related Cost, Number of Positions Eliminated, Period Percent         80.00%    
Restructuring and Related Cost, Number of Positions Eliminated | employee         500    
FES and FENOC | Discontinued Operations, Disposed of by Means Other than Sale              
Defined Benefit Plan Disclosure [Line Items]              
Related Party Transaction, Expenses from Transactions with Related Party       $ 42      
FES and FENOC | Discontinued Operations, Disposed of by Means Other than Sale | Pension              
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)         $ 64 60  
FES and FENOC | Discontinued Operations, Disposed of by Means Other than Sale | OPEB              
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)         $ (25) $ (17)