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RETIREMENT PLANS (Tables) | 3 Months Ended
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Mar. 31, 2018
Retirement Benefits [Abstract] |
Components of net periodic benefit cost | Components of net periodic benefit (credit) cost were as follows:
| First Quarter
| Pension Plans |  | Other Postretirement Benefit Plans
| 2018 |  | 2017 |  | 2018 |  | 2017
(Dollars in millions) | U.S. |  | Non-U.S. |  | U.S. |  | Non-U.S. |  |  |  |
Service cost | $ | 9 |  |  | $ | 4 |  |  | $ | 9 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 1 |
Interest cost | 17 |  |  | 5 |  |  | 17 |  |  | 5 |  |  | 6 |  |  | 6 |
Expected return on assets | (37 | ) |  | (9 | ) |  | (35 | ) |  | (8 | ) |  | (2 | ) |  | (2 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |
Prior service credit, net | — |  |  | — |  |  | (1 | ) |  | — |  |  | (10 | ) |  | (10 | )
Net periodic benefit (credit) cost | $ | (11 | ) |  | $ | — |  |  | $ | (10 | ) |  | $ | — |  |  | $ | (6 | ) |  | $ | (5 | )

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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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