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Employee Benefit Plans (Assumed Health Care Cost Trend Rate at Beginning of Year) (Details) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2017
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Assumed Health Care Cost Trend Rates at Beginning of Year |  |  |
Health care cost trend rate assumed for next year | 3.00% | 3.00% |
Maximum |  |  |
Assumed Health Care Cost Trend Rates at Beginning of Year |  |  |
Cap rate on Company's share of related costs |  |  | 2.00%

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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + 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=118255775&loc=d3e1928-114920 + 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=118255775&loc=d3e1928-114920 + Details
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