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Financial assets at fair value through profit or loss and designated at fair value through profit or loss - Securities (Details 2) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
At Fair Value through Profit or Loss R$ 654,194 R$ 568,354
Financial Assets At Carrying Value [Member]    
IfrsStatementLineItems [Line Items]    
At Fair Value through Profit or Loss 313
Non-current 313
Financial Assets At Carrying Value [Member] | Later than one year and not later than five years [member]    
IfrsStatementLineItems [Line Items]    
Non-current 12
Financial Assets At Carrying Value [Member] | Later than five years and not later than ten years [member]    
IfrsStatementLineItems [Line Items]    
Non-current 249
Financial Assets At Carrying Value [Member] | Later than ten years [member]    
IfrsStatementLineItems [Line Items]    
Non-current 52
Financial assets at fair value, class [member]    
IfrsStatementLineItems [Line Items]    
At Fair Value through Profit or Loss 318
Non-current 318
Financial assets at fair value, class [member] | Later than one year and not later than five years [member]    
IfrsStatementLineItems [Line Items]    
Non-current 12
Financial assets at fair value, class [member] | Later than five years and not later than ten years [member]    
IfrsStatementLineItems [Line Items]    
Non-current 249
Financial assets at fair value, class [member] | Later than ten years [member]    
IfrsStatementLineItems [Line Items]    
Non-current 57
Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently, category [member]    
IfrsStatementLineItems [Line Items]    
Cost 313
Accumulated gain / (loss) reflected in income 5
At Fair Value through Profit or Loss 318
Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently, category [member] | Brazilian Government Securities [member]    
IfrsStatementLineItems [Line Items]    
Cost 38
Accumulated gain / (loss) reflected in income 5
At Fair Value through Profit or Loss 43
Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently, category [member] | Government securities - Latin America [member]    
IfrsStatementLineItems [Line Items]    
Cost 275  
Accumulated gain / (loss) reflected in income  
At Fair Value through Profit or Loss R$ 275