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EMPLOYEE BENEFITS - Post-employment health care benefit plan - Funded status (Details) - Post-employment health care benefit - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Funded status of the post-employment health benefits plans    
Total net liabilities R$ (272,959) R$ (316,364)
Present value of the defined benefit obligations    
Funded status of the post-employment health benefits plans    
Total net liabilities R$ (272,959) R$ (316,364)