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EMPLOYEE BENEFITS - Post-employment health care benefit plan - Assumptions (Details) - Post-employment health care benefit
Dec. 31, 2022
Dec. 31, 2021
Minimum    
Summary of assumptions used to calculate the defined benefit plans    
Average discount rate 5.05% 2.80%
Health treatment - rate assumed next year 5.01% 4.99%
Health treatment - Assumed rate of decline in the cost to achieve in the years of 2028 to 2041 3.30% 3.20%
Maximum    
Summary of assumptions used to calculate the defined benefit plans    
Average discount rate 5.11% 2.90%
Health treatment - rate assumed next year 6.70% 6.20%
Health treatment - Assumed rate of decline in the cost to achieve in the years of 2028 to 2041 3.75% 4.50%