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Interest and similar income and expenses and income of financial assets and liabilities at fair value through profit or loss (Details 1) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]      
Interest and similar expense R$ (167,278) R$ (158,250) R$ (116,747)
Bank Deposits [Member]      
IfrsStatementLineItems [Line Items]      
Interest and similar expense (68,489) (71,508) (52,358)
Securities Sold Under Repurchase Agreements [Member]      
IfrsStatementLineItems [Line Items]      
Interest and similar expense (36,262) (41,624) (28,399)
Inter Bank Market Debt [Member]      
IfrsStatementLineItems [Line Items]      
Interest and similar expense (51,600) (34,543) (22,878)
Institutional Market Debt [Member]      
IfrsStatementLineItems [Line Items]      
Interest and similar expense (10,581) (10,239) (12,757)
Other Interest And Similar Expense [Member]      
IfrsStatementLineItems [Line Items]      
Interest and similar expense R$ (346) R$ (336) R$ (355)