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Fair value (Details 3) - BRL (R$)
R$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Scenario One [Member] | Interest rate risk [member]    
IfrsStatementLineItems [Line Items]    
Impact, Income R$ (7.4) R$ (3.5)
Impact, stockholders' equity (0.1)  
Scenario One [Member] | Commodities Indexes And Shares [Member]    
IfrsStatementLineItems [Line Items]    
Impact, Income (5.7) (13.3)
Impact, stockholders' equity   (9.6)
Scenario One [Member] | Nonlinear Risk [Member]    
IfrsStatementLineItems [Line Items]    
Impact, Income (25.1) (0.1)
Scenario Two [Member] | Interest rate risk [member]    
IfrsStatementLineItems [Line Items]    
Impact, Income (185.8) (89.2)
Impact, stockholders' equity (3.1) (0.9)
Scenario Two [Member] | Commodities Indexes And Shares [Member]    
IfrsStatementLineItems [Line Items]    
Impact, Income (11.4) (26.7)
Impact, stockholders' equity   (19.2)
Scenario Two [Member] | Nonlinear Risk [Member]    
IfrsStatementLineItems [Line Items]    
Impact, Income (45.8) (0.2)
Scenario Three [Member] | Interest rate risk [member]    
IfrsStatementLineItems [Line Items]    
Impact, Income (372.2) (178.9)
Impact, stockholders' equity R$ (6.2) R$ (1.8)