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27. EMPLOYEE BENEFITS (Details 9) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of defined benefit plans [line items]      
Allocation of plan assets R$ 3,403,906 R$ 3,305,356 R$ 3,193,493
Allocation of plan assets percent 100.00% 100.00%  
Variable income      
Disclosure of defined benefit plans [line items]      
Allocation of plan assets R$ 141,705 R$ 50,966  
Allocation of plan assets percent 4.16% 1.54%  
Fixed income      
Disclosure of defined benefit plans [line items]      
Allocation of plan assets R$ 3,050,099 R$ 3,085,783  
Allocation of plan assets percent 89.61% 93.36%  
Real estate      
Disclosure of defined benefit plans [line items]      
Allocation of plan assets R$ 52,091 R$ 44,083  
Allocation of plan assets percent 1.53% 1.33%  
Others      
Disclosure of defined benefit plans [line items]      
Allocation of plan assets R$ 160,011 R$ 124,524  
Allocation of plan assets percent 4.70% 3.77%