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27. EMPLOYEE BENEFITS (Details 12) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of net defined benefit liability (asset) [line items]      
Present value of obligations R$ 3,087,433 R$ 3,077,849 R$ 2,872,442
Actuarial liabilities 905,119 908,721  
Post-employment healthcare benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Present value of obligations 897,137 866,784  
Actuarial liabilities R$ 897,137 R$ 866,784 R$ 691,262