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RETIREMENT BENEFITS PLANS - Other Postretirement Benefits Plan Assumptions (Details) - Other postretirement benefits plans | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Assumptions used to determine benefit obligation at year-end (as a percent) |  |  |
Discount rate | 2.79% | 2.37% | 3.13%
Health care cost trend rate assumed for next year | 7.45% | 7.05% | 6.95%
Ultimate health care cost trend rate | 4.75% | 4.75% | 4.75%
Year ultimate health care cost trend rate is achieved | 2031 | 2030 | 2029
Assumptions used to determine expense (as a percent) |  |  |
Discount rate used to determine benefit obligation | 2.44% | 3.13% | 4.23%
Discount rate used to determine service cost | 2.76% | 3.25% | 4.29%
Discount rate used to determine interest cost | 1.70% | 2.67% | 3.85%
Initial health care cost trend rate | 7.38% | 6.95% | 7.10%
Ultimate health care cost trend rate | 4.75% | 4.75% | 4.75%
Year ultimate health care cost trend rate is achieved | 2030 | 2029 | 2028

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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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