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5. Trade Receivables and Reseller Financing (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
SummaryOfTradeReceivablesLineItems [Line Items]    
Trade receivables R$ 4,667,109 R$ 3,729,407
Current 4,337,118 3,502,322
Non-current 329,991 227,085
Domestic customers    
SummaryOfTradeReceivablesLineItems [Line Items]    
Trade receivables 4,057,752 3,315,783
Reseller Financing Ipiranga    
SummaryOfTradeReceivablesLineItems [Line Items]    
Trade receivables 675,236 466,277
Foreign customers    
SummaryOfTradeReceivablesLineItems [Line Items]    
Trade receivables 229,701 180,679
Allowance For Doubtful Accounts    
SummaryOfTradeReceivablesLineItems [Line Items]    
Trade receivables R$ (295,580) R$ (233,332)