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EMPLOYEE BENEFIT PLANS - Discount rate and assumptions (Details) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Supplemental Benefit Plan |  |  |
Weighted-average assumptions used to determine nonunion benefit obligations |  |  |
Discount rate (as a percent) | 4.80% | 4.30% |
Weighted-average assumptions used to determine net periodic benefit cost |  |  |
Discount rate (as a percent) | 4.30% | 4.60% | 1.80%
Postretirement Health Benefit Plan |  |  |
Weighted-average assumptions used to determine nonunion benefit obligations |  |  |
Discount rate (as a percent) | 5.50% | 4.80% |
Weighted-average assumptions used to determine net periodic benefit cost |  |  |
Discount rate (as a percent) | 4.80% | 5.00% | 2.70%

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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 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 -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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