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Pension and Other Postemployment Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended
Feb. 01, 2019
Mar. 31, 2019
Mar. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Contributions by employer $ 500    
Pension      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service costs   $ 48 $ 56
Interest costs   93 93
Expected return on plan assets   (135) (144)
Amortization of prior service costs (credits)   2 2
Special termination costs   15 0
Net periodic costs (credits), including amounts capitalized   23 7
Net periodic costs (credits), recognized in earnings   6 (14)
Pension | 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]      
Net periodic costs (credits), including amounts capitalized   11 13
OPEB      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service costs   1 1
Interest costs   5 6
Expected return on plan assets   (7) (8)
Amortization of prior service costs (credits)   (9) (20)
Special termination costs   0 0
Net periodic costs (credits), including amounts capitalized   (10) (21)
Net periodic costs (credits), recognized in earnings   (10) (21)
OPEB | 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]      
Net periodic costs (credits), including amounts capitalized   $ (1) $ (10)