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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS - ASSUMPTIONS (Details) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Pension Benefits |  |
Benefit Obligation Assumptions: |  |
Discount rate | 2.67% | 2.19%
Rate of increase in compensation levels | 3.98% | 5.07%
Net Periodic Benefit Cost Assumptions: |  |
Discount rate | 2.19% | 3.04%
Rate of increase in compensation levels | 5.07% | 5.34%
Assumed long-term rate of return on assets | 4.92% | 6.02%
Postretirement Benefits |  |
Benefit Obligation Assumptions: |  |
Discount rate | 2.94% | 3.05%
Rate of increase in compensation levels | 0.00% | 0.00%
Net Periodic Benefit Cost Assumptions: |  |
Discount rate | 3.05% | 3.26%
Rate of increase in compensation levels | 0.00% | 0.00%
Assumed long-term rate of return on assets | 0.00% | 0.00%
Postretirement Benefits | MAPD |  |
Assumed healthcare cost trend rates |  |
Projected annual rates of healthcare cost trend rates, next fiscal year (as a percent) | 9.60% |
Projected annual rates of healthcare cost trend rates, year nine and beyond (as a percent) | 4.50% |
Postretirement Benefits | Non-MAPD |  |
Assumed healthcare cost trend rates |  |
Projected annual rates of healthcare cost trend rates, year nine and beyond (as a percent) | 4.50% |
Postretirement Benefits | Non-MAPD | Low end of range |  |
Assumed healthcare cost trend rates |  |
Health care cost trend rates for prior year (as a percent) | 6.30% |
Postretirement Benefits | Non-MAPD | High end of range |  |
Assumed healthcare cost trend rates |  |
Health care cost trend rates for prior year (as a percent) | 6.80% |

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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 increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related 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)(2) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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