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Pension and Other Postemployment Benefits | 9 Months Ended
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Sep. 30, 2017
Retirement Benefits [Abstract] |
PENSIONS AND OTHER POSTEMPLOYMENT BENEFITS | PENSION AND OTHER POSTEMPLOYMENT BENEFITS 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 | )
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 | )
As of September 30, 2017, and December 31, 2016, FES had $866 million of affiliated non-current liabilities related to allocated pension and OPEB mark-to-market costs, of which $570 million was from FENOC.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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