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23. EXPENSES BY NATURE (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
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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)

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- Definition The amount of costs relating to expenses directly or indirectly attributed to the goods or services sold, which may include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, unallocated production overheads and abnormal amounts of production costs of inventories. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_99&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_103&doctype=Standard -URIDate 2018-03-16 + Details
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