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EMPLOYEE BENEFIT PLANS - Discount rate and assumptions (Details) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Supplemental Benefit Plan |  |  |
Weighted-average assumptions used to determine nonunion benefit obligations |  |  |
Discount rate (as a percent) | 4.60% | 1.80% |
Weighted-average assumptions used to determine net periodic benefit cost |  |  |
Discount rate (as a percent) | 1.80% | 1.10% | 2.40%
Postretirement Health Benefit Plan |  |  |
Weighted-average assumptions used to determine nonunion benefit obligations |  |  |
Discount rate (as a percent) | 5.00% | 2.70% |
Weighted-average assumptions used to determine net periodic benefit cost |  |  |
Discount rate (as a percent) | 2.70% | 2.30% | 3.10%

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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 https://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 https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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