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EXPENSES BY NATURE - Classified by function (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
EXPENSES BY NATURE |  |  |
Cost of sales | R$ (40,010,100) | R$ (33,312,995) | R$ (34,187,941)
Selling expenses | (570,431) | (524,965) | (710,766)
Allowance for doubtful accounts | (9,914) |  |
General and administrative expenses | (1,082,449) | (1,129,943) | (1,528,262)
Other operating income | 235,421 | 260,618 | 242,077
Other operating expenses | (270,413) | (168,887) | (114,230)
Impairment of assets |  | (1,114,807) | (2,917,911)
Gains and losses on assets held for sale and sales of interest in subsidiaries | (414,507) | (721,682) | (58,223)
Reversal of provision for tax liabilities, net |  | 929,711 |
Total Expenses | R$ (42,122,393) | R$ (35,782,950) | R$ (39,275,256)

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- Definition Gains (losses) on assets held for sale and sales of interest in subsidiaries and associates. + References No definition available. + 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 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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- Definition The amount of expense relating to general and administrative activities of the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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