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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS - ASSUMPTIONS (Details) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Pension Benefits |  |
Benefit Obligation Assumptions: |  |
Discount rate | 4.98% | 5.27%
Rate of increase in compensation levels | 3.96% | 3.95%
Net Periodic Benefit Cost Assumptions: |  |
Discount rate | 5.27% | 2.65%
Rate of increase in compensation levels | 3.95% | 3.98%
Assumed long-term rate of return on assets | 6.65% | 4.36%
Postretirement Benefits |  |
Benefit Obligation Assumptions: |  |
Discount rate | 5.12% | 5.43%
Rate of increase in compensation levels | 0.00% | 0.00%
Net Periodic Benefit Cost Assumptions: |  |
Discount rate | 5.43% | 2.94%
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) | 8.70% |
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) | 5.80% |
Postretirement Benefits | Non-MAPD | High end of range |  |
Assumed healthcare cost trend rates |  |
Health care cost trend rates for prior year (as a percent) | 6.30% |

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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 -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + 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 -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + 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 -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (l) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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