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Financial assets at amortized cost - Securities (Details 1) - BRL (R$)
R$ in Millions
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Amortized cost R$ 1,912,804 R$ 1,686,225
Financial Assets Securities [Member]    
IfrsStatementLineItems [Line Items]    
Amortized cost 327,507 260,743
Net amortized cost 323,852 259,889
Financial Assets Securities [Member] | Current [member]    
IfrsStatementLineItems [Line Items]    
Amortized cost 90,213 82,120
Net amortized cost 88,582 81,745
Financial Assets Securities [Member] | Current [member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Amortized cost 90,213 82,120
Net amortized cost 88,582 81,745
Financial Assets Securities [Member] | Non Current [Member]    
IfrsStatementLineItems [Line Items]    
Amortized cost 237,294 178,623
Net amortized cost 235,270 178,144
Financial Assets Securities [Member] | Non Current [Member] | Later than one year and not later than five years [member]    
IfrsStatementLineItems [Line Items]    
Amortized cost 165,759 132,365
Net amortized cost 164,332 131,918
Financial Assets Securities [Member] | Non Current [Member] | Later than five years and not later than ten years [member]    
IfrsStatementLineItems [Line Items]    
Amortized cost 60,289 42,062
Net amortized cost 59,694 42,031
Financial Assets Securities [Member] | Non Current [Member] | Later than ten years [member]    
IfrsStatementLineItems [Line Items]    
Amortized cost 11,246 4,196
Net amortized cost R$ 11,244 R$ 4,195