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Financial instruments - Schedule of Risk Assessment, Value-at-Risk and Scenario Analysis (Details)
R$ in Thousands
Dec. 31, 2021
BRL (R$)
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Confidence level used to determine value-at-risk 95.00%
Interest rates | VaR 1 day  
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Value at risk R$ 3,941
Interest rates | VaR 10 days  
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Value at risk 8,807
Interest rates | VaR 60 days  
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Value at risk 25,766
Credit spread on interest rates | VaR 1 day  
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Value at risk 1,126
Credit spread on interest rates | VaR 10 days  
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Value at risk 2,518
Credit spread on interest rates | VaR 60 days  
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Value at risk 7,380
Foreign currency exchange | VaR 1 day  
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Value at risk 91
Foreign currency exchange | VaR 10 days  
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Value at risk 203
Foreign currency exchange | VaR 60 days  
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Value at risk 595
Equity price | VaR 1 day  
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Value at risk 116,639
Equity price | VaR 10 days  
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Value at risk 276,999
Equity price | VaR 60 days  
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Value at risk R$ 678,505