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Risk management (Details 3) - BRL (R$)
R$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Borrowings R$ 20,305,457 R$ 17,804,385
Certificado De Deposito Interbancario [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings 12,672,245 9,966,111
Interest Benchmark Rates [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings 1,656,774 1,684,711
Indice Nacional De Precos Ao Consumidor Amplos [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings 2,927,406 3,038,378
Taxa De Juros A Longo Prazos [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings 1,290,064 1,365,806
Secured Overnight Financing Rate [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings 1,359,011 1,356,473
Interest And Charge [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings R$ 399,957 R$ 392,906