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EMPLOYEE BENEFIT PLANS - Health care trend rates (Details) - Postretirement Health Benefit Plan
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Assumed health care cost trend rates    
Health care cost trend rate assumed for next year (as a percent) 7.00% 7.00%
Rate to which the cost trend rate is assumed to decline (as a percent) 4.50% 4.50%
Year that the rate reaches the cost trend assumed rate 2036 2035