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RETIREMENT BENEFITS PLANS - Other Postretirement Benefits Plan Assumptions (Details) - Other postretirement benefits expense (income) | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Assumptions used to determine benefit obligation at year-end (as a percent) |  |  |
Discount rate | 5.24% | 5.57% | 5.11%
Health care cost trend rate assumed for next year | 6.50% | 6.70% | 7.70%
Ultimate health care cost trend rate | 4.75% | 4.75% | 4.75%
Year ultimate health care cost trend rate is achieved | 2035 | 2034 | 2033
Assumptions used to determine expense (as a percent) |  |  |
Discount rate used to determine benefit obligation | 5.57% | 5.11% | 5.46%
Discount rate used to determine service cost | 5.84% | 5.25% | 5.53%
Discount rate used to determine interest cost | 5.29% | 4.96% | 5.32%
Initial health care cost trend rate | 6.70% | 7.70% | 7.10%
Ultimate health care cost trend rate | 4.75% | 4.75% | 4.75%
Year ultimate health care cost trend rate is achieved | 2034 | 2033 | 2031

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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 5 -Subparagraph (j)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: 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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