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Weighted-Average Assumptions to Determine Net Periodic Postretirement Cost (Detail) - Postretirement Benefit Plans | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
U.S. Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 4.14% | 4.60% | 4.20%
Health care cost trend rate | 6.50% | 6.50% | 6.50%
Non-U.S. Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 4.55% | 4.77% | 4.52%
Health care cost trend rate | 5.50% | 5.50% | 5.18%

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- Definition Defined benefit plan assumptions used calculating net periodic benefit cost health care cost trend rate + 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 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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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