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26. EMPLOYEE BENEFITS (Details 18)
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
Post-employment healthcare benefits  
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans 860,738
Post-employment healthcare benefits | Year 1  
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans 75,009
Post-employment healthcare benefits | Year 2  
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans 78,161
Post-employment healthcare benefits | Year 3  
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans 81,121
Post-employment healthcare benefits | Year 4  
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans 83,850
Post-employment healthcare benefits | Year 5  
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans 86,296
Post-employment healthcare benefits | Next 5 years  
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans R$ 456,301