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Retirement Plans and Other Retiree Benefits | 6 Months Ended
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Jun. 30, 2019
Retirement Benefits [Abstract] |
Retirement Plans and Other Retiree Benefits | Retirement Plans and Other Retiree Benefits Components of Net periodic benefit cost for the three and six months ended June 30, 2019 and 2018 were as follows:
| Pension Benefits |  | Other Retiree Benefits
| United States |  | International |  |  |  |
| Three Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
Service cost | $ | — |  |  | $ | 1 |  |  | $ | 3 |  |  | $ | 3 |  |  | $ | 3 |  |  | $ | 4 |
Interest cost | 23 |  |  | 22 |  |  | 5 |  |  | 5 |  |  | 9 |  |  | 9 |
Expected return on plan assets | (24 | ) |  | (29 | ) |  | (4 | ) |  | (5 | ) |  | — |  |  | — |
Amortization of actuarial loss (gain) | 12 |  |  | 11 |  |  | 3 |  |  | 2 |  |  | 3 |  |  | 5 |
Net periodic benefit cost | $ | 11 |  |  | $ | 5 |  |  | $ | 7 |  |  | $ | 5 |  |  | $ | 15 |  |  | $ | 18 |
| Pension Benefits |  | Other Retiree Benefits
| United States |  | International |  |  |  |
| Six Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
Service cost | $ | — |  |  | $ | 1 |  |  | $ | 7 |  |  | $ | 7 |  |  | $ | 7 |  |  | $ | 8 |
Interest cost | 46 |  |  | 43 |  |  | 10 |  |  | 11 |  |  | 20 |  |  | 19 |
Expected return on plan assets | (49 | ) |  | (58 | ) |  | (9 | ) |  | (11 | ) |  | (1 | ) |  | — |
Amortization of actuarial loss (gain) | 25 |  |  | 23 |  |  | 5 |  |  | 4 |  |  | 5 |  |  | 9 |
Net periodic benefit cost | $ | 22 |  |  | $ | 9 |  |  | $ | 13 |  |  | $ | 11 |  |  | $ | 31 |  |  | $ | 36 |
For the six months ended June 30, 2019 and 2018, the Company made voluntary contributions to its U.S. postretirement plans of $102 and $0, respectively.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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