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Financial assets at amortized cost - Securities (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Amortized cost R$ 1,586,992 R$ 1,375,782  
Securities Pledged as Collateral of Funding Transactions of Financial Institutions and Clients 36,357 23,928  
Government Securities [member]      
IfrsStatementLineItems [Line Items]      
Securities Pledged as Collateral of Funding Transactions of Financial Institutions and Clients 23,639 12,570  
Government Securities [member] | Chile [Member]      
IfrsStatementLineItems [Line Items]      
Expected loss   R$ 1
Government Securities [member] | Korea [Member]      
IfrsStatementLineItems [Line Items]      
Expected loss 2 4
Government Securities [member] | Spain [Member]      
IfrsStatementLineItems [Line Items]      
Expected loss 2 1 R$ 3
Corporate Securities [Member]      
IfrsStatementLineItems [Line Items]      
Securities Pledged as Collateral of Funding Transactions of Financial Institutions and Clients 12,718 11,358  
Financial assets securities [Member]      
IfrsStatementLineItems [Line Items]      
Amortized cost 219,315 147,746  
Expected loss (2,038) (1,948)  
Net amortized cost 217,277 145,798  
Financial assets securities [Member] | Brazilian government securities [member]      
IfrsStatementLineItems [Line Items]      
Amortized cost 91,810 68,045  
Expected loss (30) (37)  
Net amortized cost 91,780 68,008  
Financial assets securities [Member] | Government Securities [member]      
IfrsStatementLineItems [Line Items]      
Amortized cost 39,243 24,888  
Expected loss (11) (7)  
Net amortized cost 39,232 24,881  
Financial assets securities [Member] | Government Securities [member] | Colombia [Member]      
IfrsStatementLineItems [Line Items]      
Amortized cost 820 925  
Expected loss (1) (1)  
Net amortized cost 819 924  
Financial assets securities [Member] | Government Securities [member] | Chile [Member]      
IfrsStatementLineItems [Line Items]      
Amortized cost 4,805 828  
Net amortized cost 4,805 828  
Financial assets securities [Member] | Government Securities [member] | Korea [Member]      
IfrsStatementLineItems [Line Items]      
Amortized cost 10,365 5,604  
Expected loss (2)    
Net amortized cost 10,363 5,604  
Financial assets securities [Member] | Government Securities [member] | Spain [Member]      
IfrsStatementLineItems [Line Items]      
Amortized cost 9,924 6,132  
Expected loss (2) (1)  
Net amortized cost 9,922 6,131  
Financial assets securities [Member] | Government Securities [member] | Mexico [Member]      
IfrsStatementLineItems [Line Items]      
Amortized cost 13,246 11,377  
Expected loss (6) (5)  
Net amortized cost 13,240 11,372  
Financial assets securities [Member] | Government Securities [member] | Paraguay [Member]      
IfrsStatementLineItems [Line Items]      
Amortized cost 59    
Net amortized cost 59    
Financial assets securities [Member] | Government Securities [member] | Uruguay [Member]      
IfrsStatementLineItems [Line Items]      
Amortized cost 24 22  
Net amortized cost 24 22  
Financial assets securities [Member] | Corporate Securities [Member]      
IfrsStatementLineItems [Line Items]      
Amortized cost 88,262 54,813  
Expected loss (1,997) (1,904)  
Net amortized cost 86,265 52,909  
Financial assets securities [Member] | Corporate Securities [Member] | Rural Product Note [Member]      
IfrsStatementLineItems [Line Items]      
Amortized cost 26,129 5,906  
Expected loss (140) (14)  
Net amortized cost 25,989 5,892  
Financial assets securities [Member] | Corporate Securities [Member] | Bank Deposit Certificates [Member]      
IfrsStatementLineItems [Line Items]      
Amortized cost 98 110  
Expected loss   (1)  
Net amortized cost 98 109  
Financial assets securities [Member] | Corporate Securities [Member] | Real Estate Receivables Certificates [Member]      
IfrsStatementLineItems [Line Items]      
Amortized cost 5,738 3,988  
Expected loss (4) (1)  
Net amortized cost 5,734 3,987  
Financial assets securities [Member] | Corporate Securities [Member] | Debentures [Member]      
IfrsStatementLineItems [Line Items]      
Amortized cost 47,785 39,403  
Expected loss (1,835) (1,883)  
Net amortized cost 45,950 37,520  
Financial assets securities [Member] | Corporate Securities [Member] | Eurobonds and others [Member]      
IfrsStatementLineItems [Line Items]      
Amortized cost 118 457  
Expected loss   (2)  
Net amortized cost 118 455  
Financial assets securities [Member] | Corporate Securities [Member] | Financial bills [Member]      
IfrsStatementLineItems [Line Items]      
Amortized cost 113 51  
Net amortized cost 113 51  
Financial assets securities [Member] | Corporate Securities [Member] | Promissory And Commercial Notes [Member]      
IfrsStatementLineItems [Line Items]      
Amortized cost 7,363 4,219  
Expected loss (13) (2)  
Net amortized cost 7,350 4,217  
Financial assets securities [Member] | Corporate Securities [Member] | Other [member]      
IfrsStatementLineItems [Line Items]      
Amortized cost 918 679  
Expected loss (5) (1)  
Net amortized cost R$ 913 R$ 678