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30. EMPLOYEE BENEFITS (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of defined benefit plans [line items]      
Actuarial assets R$ (13,819) R$ (13,714)  
Actuarial liabilities 758,426 912,184  
Benefits of Pension Plans [member]      
Disclosure of defined benefit plans [line items]      
Actuarial assets 13,819 13,714 R$ 99,894
Actuarial liabilities 79,546 19,788 7,982
Post-employment Healthcare Benefits [member]      
Disclosure of defined benefit plans [line items]      
Actuarial liabilities R$ 678,880 R$ 892,396 R$ 897,137