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23. EXPENSES BY NATURE (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Expenses by Nature R$ (18,863,368) R$ (15,827,089) R$ (14,855,170)
Cost of sales and services (16,105,657) (13,596,141) (12,640,042)
Selling expenses (2,263,688) (1,815,107) (1,696,896)
General and administrative expenses (494,023) (415,841) (518,232)
Raw materials and inputs      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Expenses by Nature (6,759,275) (5,404,801) (4,518,718)
Labor cost      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Expenses by Nature (2,743,460) (2,400,579) (2,482,111)
Supplies      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Expenses by Nature (1,782,576) (1,451,437) (1,384,437)
Maintenance cost (services and materials)      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Expenses by Nature (1,326,894) (1,145,974) (1,203,294)
Outsourcing services      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Expenses by Nature (2,368,387) (2,062,352) (2,228,786)
Freight      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Expenses by Nature (1,802,541) (1,362,087) 0
Depreciation, amortization and depletion      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Expenses by Nature (1,175,107) (1,408,765) (1,278,816)
Other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Expenses by Nature R$ (905,128) R$ (591,094) R$ (495,274)