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Employee Benefit Plans - Health Care Cost Trend Rate (Details) | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Retirement Benefits [Abstract] |  |  |
Pre-65 health care cost trend rate | 6.75% | 6.90% | 7.30%
Post-65 health care cost trend rate |  |  | 5.50%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) | 4.50% | 5.00% | 5.00%

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- Definition Defined benefit plan health care cost trend rate assumed for post retirement. + References No definition available. + Details
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- Definition Defined benefit plan health care cost trend rate assumed for pre retirement. + References No definition available. + Details
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- References No definition available. + 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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