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Pension and Other Postemployment Benefits (Details) $ in Millions | 1 Months Ended | 2 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2018 USD ($) | Jul. 31, 2018 employee | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Additional funding contributions | $ 750 |  |  |  |  |
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] |  |  |  |  |  |
Amount billed for pension and OPEB service costs |  |  | $ 14 |  | $ 28 |
Pension |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Service costs |  |  | 56 | $ 52 | 168 | $ 156
Interest costs |  |  | 93 | 97 | 279 | 291
Expected return on plan assets |  |  | (144) | (112) | (432) | (336)
Amortization of prior service costs (credits) |  |  | 2 | 2 | 6 | 6
Special termination costs |  |  | 21 | 0 | 21 | 0
Net periodic costs (credits), including amounts capitalized |  |  | 28 | 39 | 42 | 117
Net periodic costs (credits), recognized in earnings |  |  | 5 | 30 | (27) | 89
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 |  |  |  | 16 | 13 | 47
OPEB |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Service costs |  |  | 1 | 1 | 3 | 3
Interest costs |  |  | 6 | 7 | 18 | 21
Expected return on plan assets |  |  | (7) | (7) | (22) | (22)
Amortization of prior service costs (credits) |  |  | (20) | (20) | (60) | (60)
Special termination costs |  |  | 6 | 0 | 6 | 0
Net periodic costs (credits), including amounts capitalized |  |  | (14) | (19) | (55) | (58)
Net periodic costs (credits), recognized in earnings |  |  | $ (15) | (14) | (57) | (43)
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 |  |  |  | $ (8) | $ (10) | $ (24)
Minimum |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Contributions by employer | $ 500 |  |  |  |  |
FE Tomorrow Initiative |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Number of employees that accepted a voluntary enhanced retirement package | employee |  | 500 |  |  |  |
Percentage of employees that accepted the voluntary enhanced retirement package |  | 80.00% |  |  |  |

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