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Employee Benefit Plans - Assumptions Used to Determine Projected Postretirement Benefit Obligations and Postretirement Costs (Details) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Weighted-average assumptions used to determine projected pension benefit obligations |  |  |
Discount rate | 2.65% | 3.50% | 4.45%
Health care cost trend rate for medical benefits assumed for next year (pre-65) | 6.75% | 7.00% | 7.25%
Health care cost trend rate for medical benefits assumed for next year (post-65) | 5.00% | 5.25% | 5.50%
Ultimate trend rate (pre-65) | 4.50% | 4.50% | 4.50%
Ultimate trend rate (post-65) | 4.50% | 4.50% | 4.50%
Beginning discount rate | 3.50% | 4.45% | 3.85%

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- Definition The interest rate used to adjust for the time value of money for the plan at beginning of year. + References No definition available. + Details
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- Definition Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year, Post-65 + References No definition available. + Details
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- Definition Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year, Pre-65 + References No definition available. + Details
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- Definition Defined Benefit Plan, Ultimate Health Care Cost Trend Rate, Pre-65 + 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 benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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