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Pension and Postretirement Benefit Plans - Significant Weighted Average Assumptions Used in Measurement of OPEB Obligations (Details) - Other Postretirement Benefits Plan [Member] - Foreign Plan [Member] |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
OPEB benefit obligations: |  |  |  |  |  |
Discount rate | 3.41% | 3.69% | 3.96% | 3.41% | 3.69% | 3.96%
Net periodic benefit cost: |  |  |  |  |  |
Discount rate |  |  |  | 3.70% | 3.45% | 3.84%
Initial health care cost trend rate |  |  |  | 5.07% | 5.32% | 5.62%
Ultimate health care cost trend rate | 5.07% | 5.02% | 5.03% | 5.07% | 5.02% | 5.03%
Year ultimate reached | 2018 | 2018 | 2018 |  |  |

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- Definition The initial trend rate for health care costs. + References No definition available. + Details
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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 for present value of future retirement benefits cash flows, used to determine net periodic benefit cost 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 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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- References No definition available. + Details
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- Definition Year ultimate health care cost trend rate is expected to be reached, in CCYY format. + 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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- Details
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- Details
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