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Assumptions Used to Calculate Net Periodic Benefit Cost for Domestic Defined Benefit Pension and Postretirement Benefit Plans (Detail) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Defined benefit pension plans |  |  |
Net Period Benefit Cost Assumptions [Line Items] |  |  |
Discount rate | 4.00% | 4.50% | 5.20%
Weighted average rate of future compensation increases | 3.80% | 3.80% | 3.80%
Long-term rate of return on plan assets | 8.00% | 8.00% | 8.00%
Postretirement benefit plans |  |  |
Net Period Benefit Cost Assumptions [Line Items] |  |  |
Discount rate | 4.00% | 4.50% | 5.20%
Annual increase in Medicare Part B premium | 6.00% | 6.00% | 6.00%
Net Periodic Benefit Cost | Pre-65 |  |  |
Net Period Benefit Cost Assumptions [Line Items] |  |  |
Health care cost trend rate | 8.50% | 7.50% | 8.00%
Ultimate cost trend rate | 6.10% | 5.00% | 5.00%
Year that the rate reaches the ultimate cost trend rate | 2030 | 2017 | 2017
Net Periodic Benefit Cost | Post-65 |  |  |
Net Period Benefit Cost Assumptions [Line Items] |  |  |
Health care cost trend rate | 7.50% | 7.50% | 8.00%
Ultimate cost trend rate | 5.40% | 5.00% | 5.00%
Year that the rate reaches the ultimate cost trend rate | 2030 | 2017 | 2017

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- Definition Annual increase in Medicare Part B premium used to determine net periodic benefit cost for domestic postretirement benefit plans. + References No definition available. + Details
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- Definition Health Care Cost Trend Rate used to Determine Net Period Benefit Cost + References No definition available. + Details
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- Details
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- Definition The interest rate used to adjust for the time value of money. + 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=28361610&loc=d3e1928-114920 + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512013 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + 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=28361610&loc=d3e1928-114920 + Details
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- Definition The ultimate trend rate for health care costs. + 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=28361610&loc=d3e1928-114920 + Details
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- Definition Year the 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=28361610&loc=d3e1928-114920 + Details
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