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Employee Retirement Plans - Assumptions (Details) - Other postretirement benefit cost | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Assumptions used in determining net periodic pension cost for the plans |  |  |
Discount rates (as a percent) | 2.10% | 3.00% | 4.00%
Summary of healthcare cost trend rates |  |  |
Ultimate healthcare cost trend rate (as a percent) | 4.50% | 4.50% | 4.50%
Participation (as a percent) | 60.00% | 60.00% | 60.00%
Assumed health care cost trend rate for the next fiscal year (as a percent) | 7.00% | 7.00% | 6.80%
Ultimate rate in 2030 (as a percent) | 4.50% |  |
Ultimate rate in 2029 (as a percent) |  | 4.50% |
Ultimate rate in 2028 (as a percent) |  |  | 4.50%
Assumptions used to determine the benefit obligation |  |  |
Discount rate (as a percent) | 2.50% | 2.10% |

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- Definition Represents the assumed number of participants for determining the health care cost trend rate. + References No definition available. + Details
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- Definition The ultimate trend rate for health care costs in the eight fiscal year following the latest fiscal year. + References No definition available. + Details
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- Definition The ultimate trend rate for health care costs in the ninth fiscal year following the latest fiscal year. + References No definition available. + Details
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- Definition The ultimate trend rate for health care costs in the seventh fiscal year following the latest fiscal year. + 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=123447040&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost 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=123447040&loc=d3e1928-114920 + Details
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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=123447040&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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Details
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