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Pension and Other Postemployment Benefits | 6 Months Ended
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Jun. 30, 2018
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 June 30, |  | 2018 |  | 2017 |  | 2018 |  | 2017
|  | (In millions)
Service costs |  | $ | 56 |  |  | $ | 52 |  |  | $ | 1 |  |  | $ | 1 |
Interest costs |  | 93 |  |  | 97 |  |  | 6 |  |  | 7 |
Expected return on plan assets |  | (144 | ) |  | (112 | ) |  | (7 | ) |  | (7 | )
Amortization of prior service costs (credits) |  | 2 |  |  | 2 |  |  | (20 | ) |  | (20 | )
Net periodic costs (credits) |  | $ | 7 |  |  | $ | 39 |  |  | $ | (20 | ) |  | $ | (19 | )
Components of Net Periodic Benefit Costs (Credits) |  | Pension | OPEB
For the Six Months Ended June 30, |  | 2018 |  | 2017 |  | 2018 |  | 2017
|  | (In millions)
Service costs |  | $ | 112 |  |  | $ | 104 |  |  | $ | 2 |  |  | $ | 2 |
Interest costs |  | 186 |  |  | 194 |  |  | 12 |  |  | 14 |
Expected return on plan assets |  | (288 | ) |  | (224 | ) |  | (15 | ) |  | (15 | )
Amortization of prior service costs (credits) |  | 4 |  |  | 4 |  |  | (40 | ) |  | (40 | )
Net periodic costs (credits) |  | $ | 14 |  |  | $ | 78 |  |  | $ | (41 | ) |  | $ | (39 | )
Pension and OPEB obligations are allocated to FE's subsidiaries employing the plan participants. The net periodic pension and OPEB costs (credits), net of amounts capitalized, recognized in earnings by FirstEnergy were as follows:
|  | Pension |  | OPEB
Net Periodic Benefit Expense (Credit) |  | 2018 |  | 2017 |  | 2018 |  | 2017
|  | (In millions)
For the Three Months Ended June 30, |  | $ | (18 | ) |  | $ | 27 |  |  | $ | (21 | ) |  | $ | (14 | )
For the Six Months Ended June 30, |  | $ | (32 | ) |  | $ | 59 |  |  | $ | (42 | ) |  | $ | (29 | )
Amounts in the tables above include FES' and FENOC's share of the net periodic pension and OPEB costs (credits) of $13 million and $(10) million, respectively, for the three months ended June 30, 2018, and $26 million and $(20) million, respectively, for the six months ended June 30, 2018. FES' and FENOC's share of the net periodic pension and OPEB costs (credits) were $15 million and $(8) million, respectively, for the three months ended June 30, 2017 and $31 million and $(16) million, respectively, for the six months ended June 30, 2017. Such amounts are a component of Discontinued Operations in FirstEnergy's Consolidated Statements of Income. Following adoption of ASU 2017-07, "Compensation-Retirement Benefits: Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost" in 2018, service costs, net of capitalization, continue to be reported within Other operating expenses on the FirstEnergy Consolidated Statements of Income. Non-service costs are reported within Miscellaneous income, net within Other income (expense). Prior period amounts have been reclassified to conform with current year presentation. See Note 1, "Organization and Basis of Presentation," for additional information. In January 2018, FirstEnergy satisfied its minimum required funding obligations of $500 million and addressed funding obligations for future years to its qualified pension plan with additional contributions of $750 million.

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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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