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Pension and Other Post-Employment Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended
Feb. 01, 2019
Mar. 31, 2020
Mar. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net periodic costs (credits), including amounts capitalized   $ 246  
Mark-to-market adjustment   $ 423  
Decrease in discount rate   0.38%  
Contributions by employer $ 500    
Pension      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service costs   $ 52 $ 48
Interest costs   75 93
Expected return on plan assets   (153) (135)
Amortization of prior service costs (credits)   10 2
Special termination costs   0 15
One-time termination benefit   8 0
Pension and OPEB mark-to-market adjustment   386 0
Net periodic costs (credits), including amounts capitalized   378 23
Net periodic costs (credits), recognized in earnings   358 6
Net accelerated credits   $ 18  
Discount rate   2.96%  
OPEB      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service costs   $ 1 1
Interest costs   4 5
Expected return on plan assets   (8) (7)
Amortization of prior service costs (credits)   (33) (9)
Special termination costs   0 0
One-time termination benefit   0 0
Pension and OPEB mark-to-market adjustment   37 0
Net periodic costs (credits), including amounts capitalized   1 (10)
Net periodic costs (credits), recognized in earnings   $ 1 (10)
Discount rate   2.80%  
Estimated return   7.50%  
FES | Affiliated Companies | Benefit Obligations | FES and FENOC | Discontinued Operations, Disposed of by Means Other than Sale      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Amounts of transaction   $ 6 $ 10