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RETIREMENT BENEFITS PLANS | 3 Months Ended
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Mar. 31, 2018
Retirement Benefits [Abstract] |
RETIREMENT BENEFITS PLANS | RETIREMENT BENEFITS PLANS The components of retirement benefits expense follow:
| United States pension benefit expense |  | Non-United States pension benefit expense |  | Other postretirement benefits expense
| Three months ended March 31
| 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | 25 |  |  | $ | 24 |  |  | $ | 16 |  |  | $ | 17 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost | 30 |  |  | 31 |  |  | 14 |  |  | 13 |  |  | 3 |  |  | 3 |
Expected return on plan assets | (63 | ) |  | (61 | ) |  | (27 | ) |  | (23 | ) |  | (1 | ) |  | (1 | )
Amortization | 24 |  |  | 20 |  |  | 10 |  |  | 13 |  |  | (3 | ) |  | (3 | )
| 16 |  |  | 14 |  |  | 13 |  |  | 20 |  |  | — |  |  | — |
Settlements | 14 |  |  | 17 |  |  | — |  |  | — |  |  | — |  |  | — |
Total expense | $ | 30 |  |  | $ | 31 |  |  | $ | 13 |  |  | $ | 20 |  |  | $ | — |  |  | $ | — |
The components of retirement benefits expense other than service costs are included in Other income - net.

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- References No definition available. + Details
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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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