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Pension and Other Postemployment Benefits (Tables) | 9 Months Ended
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Sep. 30, 2019
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Costs | The components of the consolidated net periodic costs (credits) for pension and OPEB were as follows:
Components of Net Periodic Benefit Costs (Credits) |  | Pension | OPEB
For the Three Months Ended September 30, |  | 2019 |  | 2018 |  | 2019 |  | 2018
|  | (In millions)
Service costs (1) |  | $ | 48 |  |  | $ | 56 |  |  | $ | 1 |  |  | $ | 1 |
Interest costs (2) |  | 93 |  |  | 93 |  |  | 6 |  |  | 6 |
Expected return on plan assets (2) |  | (135 | ) |  | (144 | ) |  | (7 | ) |  | (7 | )
Amortization of prior service costs (credits) (2) |  | 2 |  |  | 2 |  |  | (9 | ) |  | (20 | )
Special termination costs (2) (3) |  | — |  |  | 21 |  |  | — |  |  | 6 |
Net periodic costs (credits), including amounts capitalized |  | $ | 8 |  |  | $ | 28 |  |  | $ | (9 | ) |  | $ | (14 | )
Net periodic costs (credits), recognized in earnings |  | $ | (11 | ) |  | $ | 5 |  |  | $ | (10 | ) |  | $ | (15 | )
Components of Net Periodic Benefit Costs (Credits) |  | Pension | OPEB
For the Nine Months Ended September 30, |  | 2019 |  | 2018 |  | 2019 |  | 2018
|  | (In millions)
Service costs (1) |  | $ | 144 |  |  | $ | 168 |  |  | $ | 3 |  |  | $ | 3 |
Interest costs (2) |  | 279 |  |  | 279 |  |  | 16 |  |  | 18 |
Expected return on plan assets (2) |  | (405 | ) |  | (432 | ) |  | (21 | ) |  | (22 | )
Amortization of prior service costs (credits) (2) |  | 6 |  |  | 6 |  |  | (27 | ) |  | (60 | )
Special termination costs (2) (3) |  | 14 |  |  | 21 |  |  | — |  |  | 6 |
Net periodic costs (credits), including amounts capitalized |  | $ | 38 |  |  | $ | 42 |  |  | $ | (29 | ) |  | $ | (55 | )
Net periodic credits, recognized in earnings |  | $ | (19 | ) |  | $ | (27 | ) |  | $ | (30 | ) |  | $ | (57 | )
(1) Service costs, net of capitalization, are reported within Other operating expenses on FirstEnergy’s Consolidated Statements of Income (Loss). (2) Non-service costs are reported within Miscellaneous income, net, within Other Income (Expense) on FirstEnergy’s Consolidated Statements of Income (Loss). (3) Subject to a cap, FirstEnergy has agreed to fund a pension enhancement through its pension plan, for voluntary enhanced retirement packages offered to certain FES employees, as well as offer certain other employee benefits (approximately $14 million recognized in the first nine months of 2019).

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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