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Financial assets at amortized cost - Securities (Details 1) - BRL (R$)
R$ in Millions
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Amortized cost R$ 1,586,992 R$ 1,375,782
Financial assets securities [Member]    
IfrsStatementLineItems [Line Items]    
Amortized cost 219,315 147,746
Fair Value 217,277 145,798
Financial assets securities [Member] | Current [member]    
IfrsStatementLineItems [Line Items]    
Amortized cost 62,237 45,353
Fair Value 61,640 45,169
Financial assets securities [Member] | Current [member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Amortized cost 62,237 45,353
Fair Value 61,640 45,169
Financial assets securities [Member] | Non current [member]    
IfrsStatementLineItems [Line Items]    
Amortized cost 157,078 102,393
Fair Value 155,637 100,629
Financial assets securities [Member] | Non current [member] | Later than one year and not later than five years [member]    
IfrsStatementLineItems [Line Items]    
Amortized cost 108,445 70,924
Fair Value 107,906 69,965
Financial assets securities [Member] | Non current [member] | Later than five years and not later than ten years [member]    
IfrsStatementLineItems [Line Items]    
Amortized cost 41,528 26,404
Fair Value 40,627 25,600
Financial assets securities [Member] | Non current [member] | Later than ten years [member]    
IfrsStatementLineItems [Line Items]    
Amortized cost 7,105 5,065
Fair Value R$ 7,104 R$ 5,064