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EMPLOYEE BENEFIT PLANS - Sensitivity Analysis (Details) - Defined benefit plan
Dec. 31, 2019
Discount rate  
Sensitivity of the balance of actuarial liabilities  
Change (as a percent) 0.50%
Increase in liability (as a percent) 8.56%
Decrease in liability (as a percent) 4.88%
Medical cost growth rate  
Sensitivity of the balance of actuarial liabilities  
Change (as a percent) 0.50%
Increase in liability (as a percent) 8.27%
Decrease in liability (as a percent) 5.60%
Mortality  
Sensitivity of the balance of actuarial liabilities  
Change (as a percent) 1.00%
Increase in liability (as a percent) 7.23%
Decrease in liability (as a percent) 4.40%
Economic inflation  
Sensitivity of the balance of actuarial liabilities  
Change (as a percent) 0.50%