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9. Trade receivables (Details 1) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
SummaryOfTradeReceivablesLineItems [Line Items]
Trade receivables	R$ 2,052,416	R$ 1,888,505
Wholesale customers - Municipal governments
SummaryOfTradeReceivablesLineItems [Line Items]
Trade receivables	1,994,905	2,568,205
Wholesale customers - Municipal governments | Guarulhos
SummaryOfTradeReceivablesLineItems [Line Items]
Trade receivables	0	760,598
Wholesale customers - Municipal governments | Maua
SummaryOfTradeReceivablesLineItems [Line Items]
Trade receivables	601,910	530,830
Wholesale customers - Municipal governments | Mogi das Cruzes
SummaryOfTradeReceivablesLineItems [Line Items]
Trade receivables	3,056	2,670
Wholesale customers - Municipal governments | Santo Andre
SummaryOfTradeReceivablesLineItems [Line Items]
Trade receivables	1,164,399	1,048,832
Wholesale customers - Municipal governments | Sao Caetano do Sul
SummaryOfTradeReceivablesLineItems [Line Items]
Trade receivables	2,869	2,604
Wholesale customers - Municipal governments | Diadema
SummaryOfTradeReceivablesLineItems [Line Items]
Trade receivables	R$ 222,671	R$ 222,671

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- Definition

The amount due from customers for goods and services sold.

+ References

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-Name IAS
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-IssueDate 2018-01-01
-Paragraph 78
-Subparagraph b
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