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Risks and Financial Instruments - summary of variation of derivative instruments hedging object (Detail)
R$ in Thousands
Dec. 31, 2019
BRL (R$)
Scenario I [member]  
Disclosure of Variation For Derivative Instruments Of Hedging Object [Line Items]  
NDF of Commodities R$ 100,542
Gross margin from Ipiranga (100,542)
NDF Commodities 0
Scenario II [member]  
Disclosure of Variation For Derivative Instruments Of Hedging Object [Line Items]  
NDF of Commodities 1,490,893
Gross margin from Ipiranga (1,490,893)
NDF Commodities 0
Scenario III [member]  
Disclosure of Variation For Derivative Instruments Of Hedging Object [Line Items]  
NDF of Commodities 2,881,245
Gross margin from Ipiranga (2,881,245)
NDF Commodities R$ 0