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19. EMPLOYEES BENEFITS (Details 5) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of defined benefit plans [line items]    
Recognised liabilities defined benefit plan R$ 776,555 R$ 689,474
Current 125,230 95,919
Non-current 651,325 593,555
Medical plan [Member] | Present value of defined benefit obligation [Member]    
Disclosure of defined benefit plans [line items]    
Recognised liabilities defined benefit plan 185,802 187,274
F.G.T.S. Penalty [Member]    
Disclosure of defined benefit plans [line items]    
Recognised liabilities defined benefit plan [1] 282,229 247,485
Award for length of service [Member]    
Disclosure of defined benefit plans [line items]    
Recognised liabilities defined benefit plan 108,908 103,284
Other [Member]    
Disclosure of defined benefit plans [line items]    
Recognised liabilities defined benefit plan R$ 199,616 R$ 151,431
[1] FGTS - Government Severance Indemnity Fund for Employees