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EMPLOYEE BENEFITS - Post-employment health care benefit plan - Assumptions (Details) - Post-employment health care benefit
Dec. 31, 2023
Dec. 31, 2022
Minimum    
Summary of assumptions used to calculate the defined benefit plans    
Average discount rate 4.63% 5.05%
Health treatment - rate assumed next year 4.84% 5.01%
Health treatment - Assumed rate of decline in the cost to achieve in the years of 2032 to 2041 3.26% 3.30%
Maximum    
Summary of assumptions used to calculate the defined benefit plans    
Average discount rate 4.92% 5.11%
Health treatment - rate assumed next year 7.60% 6.70%
Health treatment - Assumed rate of decline in the cost to achieve in the years of 2032 to 2041 4.50% 3.75%