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26. EMPLOYEE BENEFITS (Details 11)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
BRL (R$)
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans R$ 3,156,089
Year 1  
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans 276,660
Year 2  
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans 285,841
Year 3  
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans 294,923
Year 4  
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans 303,858
Year 5  
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans 312,591
Next 5 years  
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans R$ 1,682,216