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27. EMPLOYEE BENEFITS (Details 14) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of defined benefit plans [line items]      
Actuarial gain (loss) on obligation R$ (15,224) R$ 166,540  
Gain (loss) recognized in shareholders' equity (66,437) 129,913  
Post-employment healthcare benefits      
Disclosure of defined benefit plans [line items]      
Actuarial gain (loss) on obligation 16,237 170,445 R$ 210,257
Gain (loss) recognized in shareholders' equity R$ 16,237 R$ 170,445 R$ 210,257