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Derivatives (Details 5) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Notional amount of credit protection sold R$ (73,103) R$ (39,006)
Notional amount of credit protection purchased with identical underlying amount 27,708 14,027
Net position (45,395) (24,979)
Credit Default Swaps [Member]    
IfrsStatementLineItems [Line Items]    
Notional amount of credit protection sold (37,066) (20,268)
Notional amount of credit protection purchased with identical underlying amount 27,708 14,027
Net position (9,358) (6,241)
Total Returns Swap [Member]    
IfrsStatementLineItems [Line Items]    
Notional amount of credit protection sold (36,037) (18,738)
Net position R$ (36,037) R$ (18,738)