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Pension and Other Postemployment Benefits (Tables) | 9 Months Ended
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Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items] |
Components of Net Periodic Benefit Costs | The components of the consolidated net periodic costs (credits) for pension and OPEB (including amounts capitalized) were as follows:
Components of Net Periodic Benefit Costs (Credits) |  | Pension | OPEB
For the Three Months Ended September 30 |  | 2017 |  | 2016 |  | 2017 |  | 2016
|  | (In millions)
Service costs |  | $ | 52 |  |  | $ | 48 |  |  | $ | 1 |  |  | $ | 2 |
Interest costs |  | 97 |  |  | 99 |  |  | 7 |  |  | 7 |
Expected return on plan assets |  | (112 | ) |  | (100 | ) |  | (7 | ) |  | (7 | )
Amortization of prior service costs (credits) |  | 2 |  |  | 2 |  |  | (20 | ) |  | (20 | )
Net periodic costs (credits) |  | $ | 39 |  |  | $ | 49 |  |  | $ | (19 | ) |  | $ | (18 | )
Components of Net Periodic Benefit Costs (Credits) |  | Pension | OPEB
For the Nine Months Ended September 30 |  | 2017 |  | 2016 |  | 2017 |  | 2016
|  | (In millions)
Service costs |  | $ | 156 |  |  | $ | 144 |  |  | $ | 3 |  |  | $ | 4 |
Interest costs |  | 291 |  |  | 298 |  |  | 21 |  |  | 22 |
Expected return on plan assets |  | (336 | ) |  | (297 | ) |  | (22 | ) |  | (23 | )
Amortization of prior service costs (credits) |  | 6 |  |  | 6 |  |  | (60 | ) |  | (60 | )
Net periodic costs (credits) |  | $ | 117 |  |  | $ | 151 |  |  | $ | (58 | ) |  | $ | (57 | )
Net Periodic Pension and OPEB Costs | FES' share of the net periodic pension and OPEB costs (credits) were as follows:
|  | Pension | OPEB
|  | 2017 |  | 2016 |  | 2017 |  | 2016
|  | (In millions)
For the Three Months Ended September 30 |  | $ | 3 |  |  | $ | 6 |  |  | $ | (4 | ) |  | $ | (4 | )
For the Nine Months Ended September 30 |  | 9 |  |  | 18 |  |  | (12 | ) |  | (12 | )
Pension and OPEB obligations are allocated to FE's subsidiaries, including FES, employing the plan participants. The net periodic pension and OPEB costs (credits), net of amounts capitalized, recognized in earnings by FirstEnergy and FES were as follows:
Net Periodic Benefit Expense (Credit) |  | Pension |  | OPEB
For the Three Months Ended September 30 |  | 2017 |  | 2016 |  | 2017 |  | 2016
|  | (In millions)
FirstEnergy |  | $ | 30 |  |  | $ | 35 |  |  | $ | (14 | ) |  | $ | (11 | )
FES |  | 3 |  |  | 5 |  |  | (4 | ) |  | (4 | )
Net Periodic Benefit Expense (Credit) |  | Pension |  | OPEB
For the Nine Months Ended September 30 |  | 2017 |  | 2016 |  | 2017 |  | 2016
|  | (In millions)
FirstEnergy |  | $ | 89 |  |  | $ | 107 |  |  | $ | (43 | ) |  | $ | (41 | )
FES |  | 9 |  |  | 17 |  |  | (12 | ) |  | (12 | )
FES |
Defined Benefit Plan Disclosure [Line Items] |
Components of Net Periodic Benefit Costs | FES' share of the net periodic pension and OPEB costs (credits) were as follows:
|  | Pension | OPEB
|  | 2017 |  | 2016 |  | 2017 |  | 2016
|  | (In millions)
For the Three Months Ended September 30 |  | $ | 3 |  |  | $ | 6 |  |  | $ | (4 | ) |  | $ | (4 | )
For the Nine Months Ended September 30 |  | 9 |  |  | 18 |  |  | (12 | ) |  | (12 | )

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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