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Pension and Other Postemployment Benefits | 3 Months Ended
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Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract] |
PENSIONS AND OTHER POSTEMPLOYMENT BENEFITS | PENSION AND OTHER POSTEMPLOYMENT BENEFITS The components of the consolidated net periodic cost (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 March 31 |  | 2017 |  | 2016 |  | 2017 |  | 2016
|  | (In millions)
Service costs |  | $ | 52 |  |  | $ | 48 |  |  | $ | 1 |  |  | $ | 1 |
Interest costs |  | 97 |  |  | 100 |  |  | 7 |  |  | 7 |
Expected return on plan assets |  | (112 | ) |  | (97 | ) |  | (8 | ) |  | (8 | )
Amortization of prior service costs (credits) |  | 2 |  |  | 2 |  |  | (20 | ) |  | (20 | )
Net periodic costs (credits) |  | $ | 39 |  |  | $ | 53 |  |  | $ | (20 | ) |  | $ | (20 | )
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 March 31 |  | $ | 3 |  |  | $ | 6 |  |  | $ | (4 | ) |  | $ | (4 | )
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 March 31 |  | 2017 |  | 2016 |  | 2017 |  | 2016
|  | (In millions)
FirstEnergy |  | $ | 32 |  |  | $ | 37 |  |  | $ | (15 | ) |  | $ | (15 | )
FES |  | 3 |  |  | 6 |  |  | (4 | ) |  | (4 | )
As of March 31, 2017, and December 31, 2016, FES has $866 million of affiliated non-current liabilities related to allocated pension and OPEB mark-to-market costs, of which $570 million is from FENOC.

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