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27. EMPLOYEE BENEFITS (Details 11)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
BRL (R$)
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans R$ 2,740,285
Year 1  
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans 244,606
Year 2  
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans 252,778
Year 3  
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans 269,332
Year 4  
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans 265,261
Year 5  
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans 271,570
Next 5 years  
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans R$ 1,436,738