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Stockholders' equity (Details 4) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Capital reserves R$ 2,480 R$ 2,250 R$ 2,326
Profit reserves 86,892 66,161 47,347
Total reserves at parent company 89,372 68,411 49,673
Net income remaining after the distribution of dividends and appropriations to statutory reserves 288    
Premium On Subscription Of Shares [Member]      
IfrsStatementLineItems [Line Items]      
Capital reserves 284 284 284
Reserve of share-based payments [member]      
IfrsStatementLineItems [Line Items]      
Capital reserves 2,192 1,962 2,038
Reserves From Tax Incentives Restatement Of Equity Securities And Other [Member]      
IfrsStatementLineItems [Line Items]      
Capital reserves 4 4 4
Legal [Member]      
IfrsStatementLineItems [Line Items]      
Profit reserves 15,071 13,586 12,274
Statutory reserve [member]      
IfrsStatementLineItems [Line Items]      
Profit reserves R$ 71,821 R$ 52,575 R$ 35,073