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Pension and Other Postemployment Benefits (Details Textuals) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Dec. 13, 2016
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 01, 2014
Defined Benefit Plan Disclosure [Line Items]            
Mark-to-market adjustment   $ 194 $ 194 $ 369 $ 1,243  
Mark-to-market adjustment, net of capitalized amounts   147 $ 147 242 835  
Decrease in mortality rate (percent)     0.25%      
Funding contributions made for current and future years     $ 882      
Pension contributions $ 500   382 143 0  
Equity contribution from parent $ 500 500        
Non-cash transaction: stock contribution to pension plan     500 0 0  
Pensions and OPEB            
Defined Benefit Plan Disclosure [Line Items]            
Actual return (losses) on plan assets     $ 472 $ (172) $ 387  
Actual return on plan assets (percent)     8.20% (2.70%) 6.20%  
Expected return on plan assets     $ 429 $ 476 $ 496  
Pension            
Defined Benefit Plan Disclosure [Line Items]            
Decrease in underfunded status           $ 40
Company contributions     899 161    
Actual return (losses) on plan assets     $ 442 $ (178)    
Expected long-term return on plan assets     7.50% 7.75% 7.75%  
Expected return on plan assets     $ 399 $ 443 $ 462  
Increase in benefit obligation due to RP2014 mortality table     141      
Estimated amortization of prior service costs (credits) from AOCI in next fiscal year     8      
Excluded from total investments   16 16 (7)    
OPEB            
Defined Benefit Plan Disclosure [Line Items]            
Effect of plan amendment on accumulated benefit obligation   13 13 10    
Company contributions     9 17    
Actual return (losses) on plan assets     $ 30 $ 6    
Expected long-term return on plan assets     7.50% 7.75% 7.75%  
Expected return on plan assets     $ 30 $ 33 $ 34  
Increase in benefit obligation due to RP2014 mortality table     8      
Estimated amortization of prior service costs (credits) from AOCI in next fiscal year     (81)      
Excluded from total investments   $ (4) (4) (7)    
Minimum            
Defined Benefit Plan Disclosure [Line Items]            
Company contributions     382      
FE | Pension            
Defined Benefit Plan Disclosure [Line Items]            
Non-cash transaction: stock contribution to pension plan     293      
FES            
Defined Benefit Plan Disclosure [Line Items]            
Pension contributions     138 $ 0 0  
Equity contribution from parent     $ 0   $ 500