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26. EXPENSES BY NATURE (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
ExpenseByNatureLineItems [Line Items] |  |  |
Expense, net | R$ (21,633,776) | R$ (20,117,134) | R$ (18,863,368)
Classified as: |  |  |
Cost of sales | 19,124,901 | 17,263,264 | 16,105,657
Selling expenses | (2,004,417) | (2,342,805) | (2,263,688)
General and administrative expenses | (504,458) | (511,065) | (494,023)
Total | (21,633,776) | (20,117,134) | (18,863,368)
Raw materials and inputs [member] |  |  |
ExpenseByNatureLineItems [Line Items] |  |  |
Expense, net | (6,928,517) | (7,287,933) | (6,759,275)
Labor cost [member] |  |  |
ExpenseByNatureLineItems [Line Items] |  |  |
Expense, net | (3,187,428) | (2,807,280) | (2,743,460)
Supplies [member] |  |  |
ExpenseByNatureLineItems [Line Items] |  |  |
Expense, net | (2,150,452) | (1,981,547) | (1,782,576)
Maintenance cost Services and materials [member] |  |  |
ExpenseByNatureLineItems [Line Items] |  |  |
Expense, net | (1,340,255) | (1,340,135) | (1,326,894)
Outsourcing services [member] |  |  |
ExpenseByNatureLineItems [Line Items] |  |  |
Expense, net | (2,217,657) | (2,392,626) | (2,368,387)
Freights [member] |  |  |
ExpenseByNatureLineItems [Line Items] |  |  |
Expense, net | (216,506) | (334,509) | (109,756)
Distribution freights [member] |  |  |
ExpenseByNatureLineItems [Line Items] |  |  |
Expense, net | (1,421,079) | (1,787,979) | (1,692,785)
Depreciation amortization and depletion [member] |  |  |
ExpenseByNatureLineItems [Line Items] |  |  |
Expense, net | (2,421,458) | (1,421,704) | (1,175,107)
Others [member] |  |  |
ExpenseByNatureLineItems [Line Items] |  |  |
Expense, net | R$ (1,750,424) | R$ (763,421) | R$ (905,128)

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- Definition The amount of expenses that the entity classifies as being administrative. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2020-01-01 -Paragraph 35 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=26&code=ifrs-tx-2020-en-r&anchor=para_35_b_vi&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_103&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_99&doctype=Standard -URIDate 2020-01-01 + Details
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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 2020-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_99&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_103&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of expense relating to the marketing and selling of goods or services. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_85&doctype=Standard -URIDate 2020-01-01 + Details
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