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13. FINANCIAL INSTRUMENTS (Details 15) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Perpetual bonds
Disclosure of financial liabilities [line items]
Carrying amount	R$ 3,880,074	R$ 3,312,503
Fair value	2,850,615	2,602,090
Fixed rate notes
Disclosure of financial liabilities [line items]
Carrying amount	6,745,132	5,751,526
Fair value	R$ 7,595,765	R$ 6,207,946

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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- Definition

The fair value of financial liabilities. [Refer: At fair value [member]; Financial liabilities]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 25
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