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Financial assets at fair value through other comprehensive income - Securities (Details 1) - BRL (R$)
R$ in Millions
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Gross carrying amount R$ 41,123 R$ 49,545
Current Fair value 39,877 48,643
Non-current gross carrying amount 70,341 81,948
Non-current fair value 66,426 81,396
Gross carrying amount 111,464 131,493
Fair value 106,303 130,039
Nonstated Maturity [Member]    
IfrsStatementLineItems [Line Items]    
Gross carrying amount 1,762 6,960
Current Fair value 566 6,143
Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Gross carrying amount 39,361 42,585
Current Fair value 39,311 42,500
Later than one year and not later than five years [member]    
IfrsStatementLineItems [Line Items]    
Non-current gross carrying amount 49,121 56,984
Non-current fair value 47,809 56,886
Later than five years and not later than ten years [member]    
IfrsStatementLineItems [Line Items]    
Non-current gross carrying amount 11,201 14,518
Non-current fair value 10,803 14,585
Later than ten years [member]    
IfrsStatementLineItems [Line Items]    
Non-current gross carrying amount 10,019 10,446
Non-current fair value R$ 7,814 R$ 9,925