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Employee Benefits Plans (Details 14) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Foreign Plan |  |
Summary of actuarial assumptions used in determining accrued postretirement benefit obligations |  |
Discount rate | 2.70% | 3.90%
Rate of increase in compensation levels | 3.10% | 3.10%
United States |  |
Summary of actuarial assumptions used in determining accrued postretirement benefit obligations |  |
Discount rate | 3.70% | 4.20%
Rate of increase in compensation levels | 3.00% | 3.00%
Other Postretirement Benefits Plan [Member] | Foreign Plan |  |
Summary of actuarial assumptions used in determining accrued postretirement benefit obligations |  |
Discount rate | 3.40% | 3.90%
Rate of increase in compensation levels | 3.00% | 3.00%
Healthcare cost trend rate assumed for next year | 5.00% | 5.00%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate) | 5.00% | 5.00%
Year that the rate reaches the ultimate trend rate | 2017 | 2018
Other Postretirement Benefits Plan [Member] | United States |  |
Summary of actuarial assumptions used in determining accrued postretirement benefit obligations |  |
Discount rate | 3.70% | 4.20%
Rate of increase in compensation levels | 3.00% | 3.00%
Healthcare cost trend rate assumed for next year | 7.25% | 7.50%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate) | 5.00% | 5.00%
Year that the rate reaches the ultimate trend rate | 2027 | 2027

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + 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 (k)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + 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 (l) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Ultimate trend rate for health care cost for defined benefit postretirement plan. + 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 (l) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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