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Financial assets at amortized cost - Securities (Details 2) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Gains / (Losses) R$ (114) R$ (84)
Government Securities [member]    
IfrsStatementLineItems [Line Items]    
Gains / (Losses) (1)  
Korea [Member] | Government Securities [member]    
IfrsStatementLineItems [Line Items]    
Expected loss (4)
Expected loss (2)
Spain [Member] | Government Securities [member]    
IfrsStatementLineItems [Line Items]    
Expected loss (1) (3)
Expected loss (2) (1)
Chile [Member] | Government Securities [member]    
IfrsStatementLineItems [Line Items]    
Expected loss (1)
Expected loss  
Stage One [member]    
IfrsStatementLineItems [Line Items]    
Expected loss (74) (185)
Gains / (Losses) (80) 188
Purchases (149) (147)
Settlements 42 70
Transfer to Stage 2 53  
Transfer to Stage 3 3  
Cure from Stage 2 (3)  
Expected loss (208) (74)
Transfer to Stage 3 (3)  
Settlements (42) (70)
Transfer to Stage 2 (53)  
Stage One [member] | Government Securities [member]    
IfrsStatementLineItems [Line Items]    
Expected loss (7) (14)
Gains / (Losses) 8 37
Purchases (18) (36)
Settlements 6 6
Expected loss (11) (7)
Settlements (6) (6)
Stage One [member] | Corporate Securities [Member]    
IfrsStatementLineItems [Line Items]    
Expected loss (30) (127)
Gains / (Losses) (95) 144
Purchases (131) (111)
Settlements 36 64
Transfer to Stage 2 53  
Transfer to Stage 3 3  
Cure from Stage 2 (3)  
Expected loss (167) (30)
Transfer to Stage 3 (3)  
Settlements (36) (64)
Transfer to Stage 2 (53)  
Stage One [member] | Corporate Securities [Member] | Rural Product Note [Member]    
IfrsStatementLineItems [Line Items]    
Expected loss (5) (23)
Gains / (Losses) (65) 39
Purchases (64) (24)
Settlements 8 3
Transfer to Stage 2 21  
Transfer to Stage 3 3  
Cure from Stage 2 (3)  
Expected loss (105) (5)
Transfer to Stage 3 (3)  
Settlements (8) (3)
Transfer to Stage 2 (21)  
Stage One [member] | Corporate Securities [Member] | Bank Deposit Certificates [Member]    
IfrsStatementLineItems [Line Items]    
Expected loss (1)
Gains / (Losses) 1 1
Purchases   (10)
Settlements   8
Expected loss   (1)
Settlements   (8)
Stage One [member] | Corporate Securities [Member] | Real Estate Receivables Certificates [Member]    
IfrsStatementLineItems [Line Items]    
Expected loss (1) (8)
Gains / (Losses) 14 6
Purchases (19)  
Settlements 2 1
Expected loss (4) (1)
Settlements (2) (1)
Stage One [member] | Corporate Securities [Member] | Debentures [Member]    
IfrsStatementLineItems [Line Items]    
Expected loss (18) (78)
Gains / (Losses) (42) 74
Purchases (31) (52)
Settlements 15 38
Transfer to Stage 2 32  
Expected loss (44) (18)
Settlements (15) (38)
Transfer to Stage 2 (32)  
Stage One [member] | Corporate Securities [Member] | Eurobonds and others [Member]    
IfrsStatementLineItems [Line Items]    
Expected loss (2) (1)
Gains / (Losses)   8
Purchases   (20)
Settlements 2 11
Expected loss   (2)
Settlements (2) (11)
Stage One [member] | Corporate Securities [Member] | Promissory And Commercial Notes [Member]    
IfrsStatementLineItems [Line Items]    
Expected loss (2)  
Gains / (Losses) (1)  
Purchases (14)  
Settlements 4  
Expected loss (13) (2)
Settlements (4)  
Stage One [member] | Corporate Securities [Member] | Other [member]    
IfrsStatementLineItems [Line Items]    
Expected loss (1) (7)
Gains / (Losses) (2) 6
Purchases (3)  
Settlements 5  
Expected loss (1) (1)
Settlements (5)  
Stage One [member] | Corporate Securities [Member] | Promissory Notes [member]    
IfrsStatementLineItems [Line Items]    
Expected loss (2) (10)
Gains / (Losses)   10
Purchases   (5)
Settlements   3
Expected loss   (2)
Settlements   (3)
Stage One [member] | Brazil [Member] | Government Securities [member]    
IfrsStatementLineItems [Line Items]    
Expected loss (37) (44)
Gains / (Losses) 7 7
Expected loss (30) (37)
Stage One [member] | Colombia [Member] | Government Securities [member]    
IfrsStatementLineItems [Line Items]    
Expected loss (1)
Gains / (Losses) 1 4
Purchases (1) (6)
Settlements   (1)
Expected loss (1) (1)
Settlements   1
Stage One [member] | Korea [Member] | Government Securities [member]    
IfrsStatementLineItems [Line Items]    
Gains / (Losses) (2) 7
Purchases   (3)
Stage One [member] | Spain [Member] | Government Securities [member]    
IfrsStatementLineItems [Line Items]    
Gains / (Losses)   6
Purchases (1) (5)
Settlements   (1)
Settlements   1
Stage One [member] | Mexico [Member] | Government Securities [member]    
IfrsStatementLineItems [Line Items]    
Expected loss (5) (6)
Gains / (Losses) 9 19
Purchases (16) (22)
Settlements 6 (4)
Expected loss (6) (5)
Settlements (6) 4
Stage One [member] | Chile [Member] | Government Securities [member]    
IfrsStatementLineItems [Line Items]    
Gains / (Losses)   1
Stage Two [Member]    
IfrsStatementLineItems [Line Items]    
Expected loss (38) (53)
Gains / (Losses) (136) 19
Purchases (3) (20)
Settlements 104 16
Transfer to Stage 3 (9)  
Expected loss (114) (38)
Cure from Stage 1 3  
Transfer to Stage 3 9  
Transfer to Stage 1 (53)  
Settlements (104) (16)
Stage Two [Member] | Corporate Securities [Member]    
IfrsStatementLineItems [Line Items]    
Expected loss (38) (53)
Gains / (Losses) (136) 19
Purchases (3) (20)
Settlements 104 16
Transfer to Stage 3 (9)  
Expected loss (114) (38)
Cure from Stage 1 3  
Transfer to Stage 3 9  
Transfer to Stage 1 (53)  
Settlements (104) (16)
Stage Two [Member] | Corporate Securities [Member] | Rural Product Note [Member]    
IfrsStatementLineItems [Line Items]    
Expected loss (2)
Gains / (Losses) (12) 2
Purchases (3)  
Transfer to Stage 3 (9)  
Expected loss (24)
Cure from Stage 1 3  
Transfer to Stage 3 9  
Transfer to Stage 1 (21)  
Stage Two [Member] | Corporate Securities [Member] | Real Estate Receivables Certificates [Member]    
IfrsStatementLineItems [Line Items]    
Expected loss   (4)
Settlements   (4)
Settlements   4
Stage Two [Member] | Corporate Securities [Member] | Debentures [Member]    
IfrsStatementLineItems [Line Items]    
Expected loss (38) (47)
Gains / (Losses) (120) 17
Settlements (104) (12)
Expected loss (86) (38)
Transfer to Stage 1 (32)  
Settlements 104 12
Stage Two [Member] | Corporate Securities [Member] | Other [member]    
IfrsStatementLineItems [Line Items]    
Gains / (Losses) (4)  
Expected loss (4)  
Stage three [Member]    
IfrsStatementLineItems [Line Items]    
Expected loss (1,836) (2,827)
Gains / (Losses) (244) 610
Purchases (27) (51)
Settlements 403 432
Transfer to Stage 2 9  
Expected loss (1,716) (1,836)
Transfer to Stage 1 (3)  
Settlements (403) (432)
Transfer to Stage 2 (9)  
Stage three [Member] | Corporate Securities [Member]    
IfrsStatementLineItems [Line Items]    
Expected loss (1,836) (2,827)
Gains / (Losses) (244) 610
Purchases (27) (51)
Settlements 403 432
Transfer to Stage 2 9  
Expected loss (1,716) (1,836)
Transfer to Stage 1 (3)  
Settlements (403) (432)
Transfer to Stage 2 (9)  
Stage three [Member] | Corporate Securities [Member] | Rural Product Note [Member]    
IfrsStatementLineItems [Line Items]    
Expected loss (9)
Gains / (Losses) 7 6
Purchases (6) (15)
Settlements (9)  
Transfer to Stage 2 9  
Expected loss (11) (9)
Transfer to Stage 1 (3)  
Settlements 9  
Transfer to Stage 2 (9)  
Stage three [Member] | Corporate Securities [Member] | Debentures [Member]    
IfrsStatementLineItems [Line Items]    
Expected loss (1,827) (2,827)
Gains / (Losses) (251) 604
Purchases (21) (36)
Settlements (394) (432)
Expected loss (1,705) (1,827)
Settlements R$ 394 R$ 432