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Postretirement Benefits Other than Pensions - Discount Rate to Determine the Benefit Obligation (Details) | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Other Postretirement Benefit Plan [Member] |  |  |
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] |  |  |
Discount rate (as a percent) | 3.83% | 3.15% | 3.47%

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- References No definition available. + Details
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- Details
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