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27. EMPLOYEE BENEFITS (Details 18)
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
Post-employment healthcare benefits  
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans 865,496
Post-employment healthcare benefits | Year 1  
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans 78,100
Post-employment healthcare benefits | Year 2  
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans 80,787
Post-employment healthcare benefits | Year 3  
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans 83,232
Post-employment healthcare benefits | Year 4  
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans 85,386
Post-employment healthcare benefits | Year 5  
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans 87,224
Post-employment healthcare benefits | Next 5 years  
Disclosure of defined benefit plans [line items]  
Benefit payments of the defined benefit plans R$ 450,767