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Financial assets at fair value through other comprehensive income - Securities (Details) - BRL (R$)
R$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]      
Gross carrying amount R$ 128,014 R$ 128,014 R$ 108,555
Fair value adjustments (in stockholders' equity)   (6,848) (2,849)
Fair value 121,052 121,052 105,622
Expected loss   (114) (84)
Financial assets at fair value through other comprehensive income-Securities pledged in guarantee of funding transactions of financial institutions and clients 58,300 58,300 46,723
Brazilian government securities [member]      
IfrsStatementLineItems [Line Items]      
Gross carrying amount 73,554 73,554 71,298
Fair value adjustments (in stockholders' equity)   (2,571) (1,656)
Fair value 70,983 70,983 69,642
Financial assets at fair value through other comprehensive income-Securities pledged in guarantee of funding transactions of financial institutions and clients 50,918 50,918 43,560
Brazilian government securities [member] | Other [member]      
IfrsStatementLineItems [Line Items]      
Gross carrying amount 36 36 36
Expected loss   (36) (36)
Government Securities [member]      
IfrsStatementLineItems [Line Items]      
Gross carrying amount 38,397 38,397 30,507
Fair value adjustments (in stockholders' equity)   (486) (313)
Fair value 37,910 37,910 30,194
Expected loss   (1)  
Financial assets at fair value through other comprehensive income-Securities pledged in guarantee of funding transactions of financial institutions and clients 6,662 6,662 2,385
Government Securities [member] | Argentina [Member]      
IfrsStatementLineItems [Line Items]      
Gross carrying amount 2,791 2,791 409
Fair value adjustments (in stockholders' equity)   (11) (4)
Fair value 2,780 2,780 405
Government Securities [member] | Colombia [Member]      
IfrsStatementLineItems [Line Items]      
Gross carrying amount 1,766 1,766 1,942
Fair value adjustments (in stockholders' equity)   (284) (95)
Fair value 1,482 1,482 1,847
Government Securities [member] | Chile [Member]      
IfrsStatementLineItems [Line Items]      
Gross carrying amount 18,358 18,358 19,885
Fair value adjustments (in stockholders' equity)   (129) (151)
Fair value 18,229 18,229 19,734
Government Securities [member] | United States [Member]      
IfrsStatementLineItems [Line Items]      
Gross carrying amount 9,104 9,104 4,520
Fair value adjustments (in stockholders' equity)   (49) (2)
Fair value 9,055 9,055 4,518
Government Securities [member] | Mexico [Member]      
IfrsStatementLineItems [Line Items]      
Gross carrying amount 760 760 1,028
Fair value adjustments (in stockholders' equity)   (3) (6)
Fair value 757 757 1,022
Government Securities [member] | Paraguay [Member]      
IfrsStatementLineItems [Line Items]      
Gross carrying amount 3,362 3,362 1,516
Fair value adjustments (in stockholders' equity)   3 (57)
Fair value 3,364 3,364 1,459
Expected loss (1)    
Government Securities [member] | Switzerland [Member]      
IfrsStatementLineItems [Line Items]      
Gross carrying amount 1,356 1,356  
Fair value adjustments (in stockholders' equity)   (11)  
Fair value 1,345 1,345  
Government Securities [member] | Uruguay [Member]      
IfrsStatementLineItems [Line Items]      
Gross carrying amount 900 900 1,207
Fair value adjustments (in stockholders' equity)   (2) 2
Fair value 898 898 1,209
Corporate Debt Securitie [Member]      
IfrsStatementLineItems [Line Items]      
Gross carrying amount 16,027 16,027 6,714
Fair value adjustments (in stockholders' equity)   (3,791) (880)
Fair value 12,159 12,159 5,786
Expected loss   (77) (48)
Corporate Debt Securitie [Member] | Other [member]      
IfrsStatementLineItems [Line Items]      
Gross carrying amount 707 707 57
Fair value adjustments (in stockholders' equity)   (8) 3
Fair value 695 695 57
Expected loss   (4) (3)
Corporate Debt Securitie [Member] | Shares [Member]      
IfrsStatementLineItems [Line Items]      
Gross carrying amount 8,571 8,571 1,629
Fair value adjustments (in stockholders' equity)   (3,686) (886)
Fair value 4,885 4,885 743
Corporate Debt Securitie [Member] | Rural Product Note [Member]      
IfrsStatementLineItems [Line Items]      
Gross carrying amount 373 373  
Fair value adjustments (in stockholders' equity)   18  
Fair value 390 390  
Expected loss   (1)  
Corporate Debt Securitie [Member] | Bank Deposit Certificates [Member]      
IfrsStatementLineItems [Line Items]      
Gross carrying amount 714 714 132
Fair value adjustments (in stockholders' equity)     (1)
Fair value 714 714 131
Corporate Debt Securitie [Member] | Debentures [Member]      
IfrsStatementLineItems [Line Items]      
Gross carrying amount 1,231 1,231 392
Fair value adjustments (in stockholders' equity)   (3) 3
Fair value 1,183 1,183 351
Expected loss   (45) (44)
Corporate Debt Securitie [Member] | Eurobonds and others [Member]      
IfrsStatementLineItems [Line Items]      
Gross carrying amount 4,418 4,418 4,498
Fair value adjustments (in stockholders' equity)   (112) 1
Fair value 4,279 4,279 4,498
Expected loss   (27) (1)
Corporate Debt Securitie [Member] | Financial bills [Member]      
IfrsStatementLineItems [Line Items]      
Gross carrying amount 13 13 6
Fair value 13 13 6
Corporate Securities [Member]      
IfrsStatementLineItems [Line Items]      
Financial assets at fair value through other comprehensive income-Securities pledged in guarantee of funding transactions of financial institutions and clients R$ 720 R$ 720 R$ 778