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Risks and Financial Instruments - Changes in exchange rate (Detail) - Scenario Base [member]
R$ in Thousands
Dec. 31, 2021
BRL (R$)
Currency swaps receivable in U.S. dollars  
U.S. Dollar / Real swaps R$ 137,304
Debts / firm commitments in dollars (137,301)
Net effect 3
Currency swaps payable in U.S. dollars  
Real / U.S. Dollar swaps 49,935,747
Gross margin of Oxiteno/Ipiranga (49,935,747)
Net effect
Cash Flow Hedge  
Cash Flow Hedge 528,360
Debts (528,360)
Cash Flow Hedge, Net effect in equity
Net Investment hedge in foreign entities  
Net Investment Hedge 252,423
Debts (252,423)
Net Investment hedge in foreign entities, Net effect in equity
Interest rate swap (Real) - Debentures - CRA  
Fixed rate swap - DI (20,053,149)
Fixed rate debt 20,053,149
Net effect