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27. EMPLOYEE BENEFITS (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of fair value of plan assets [line items]      
Actuarial assets R$ (99,894) R$ (111,281)  
Actuarial liabilities 905,119 908,721  
Pension plan benefits      
Disclosure of fair value of plan assets [line items]      
Actuarial assets (99,894) (111,281)  
Actuarial liabilities 7,982 41,937  
Post-employment healthcare benefits      
Disclosure of fair value of plan assets [line items]      
Actuarial assets 0 0  
Actuarial liabilities R$ 897,137 R$ 866,784 R$ 691,262