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Pension and Other Postemployment Benefits (Details 1) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Pension      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 193 $ 224 $ 208
Interest cost 373 372 390
Expected return on plan assets (540) (574) (448)
Amortization of prior service costs (credits) 7 7 7
Special termination costs 14 31 0
Pension & OPEB mark-to-market adjustment 656 227 108
Net periodic benefit costs (credits) 703 287 265
OPEB      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost 3 5 5
Interest cost 22 25 27
Expected return on plan assets (29) (31) (30)
Amortization of prior service costs (credits) (36) (81) (81)
Special termination costs 0 8 0
Pension & OPEB mark-to-market adjustment 20 (82) 13
Net periodic benefit costs (credits) (20) (156) (66)
Discontinued Operations, Disposed of by Means Other than Sale | FES and FENOC | Pension      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net periodic benefit costs (credits) 242 64 60
Discontinued Operations, Disposed of by Means Other than Sale | FES and FENOC | OPEB      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net periodic benefit costs (credits) (19) $ (25) $ (17)
Discontinued Operations, Disposed of by Means Other than Sale | Affiliated companies | FES and FENOC | Pension Plan Enhancement      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Amounts of transaction $ 14