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Employee Benefit Plans - Health Care Cost Trend Rate (Details) | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Retirement Benefits [Abstract] |  |  |
Pre-65 health care cost trend rate | 6.50% | 6.75% | 6.90%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) | 4.50% | 4.50% | 5.00%

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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