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Pension and Other Postretirement Benefits - Healthcare cost trend rates (Details) - Postretirement Benefits Medical and Prescription Drug | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Assumed healthcare cost trend rates used to determine benefit obligations and net cost: |  |  |
Rate that the cost trend rate is assumed to decline (the ultimate trend rate) | 4.50% | 4.50% | 4.50%
Minimum |  |  |
Assumed healthcare cost trend rates used to determine benefit obligations and net cost: |  |  |
Healthcare cost trend rate assumed for next year | 6.03% | 6.25% | 5.50%
Maximum |  |  |
Assumed healthcare cost trend rates used to determine benefit obligations and net cost: |  |  |
Healthcare cost trend rate assumed for next year | 8.44% | 9.00% | 8.50%

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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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