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Loan and lease operations (Details 2) - Expected credit losses [member] - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Beginning balance R$ (44,316) R$ (48,322)
Net increase / (Reversal) 28,150 14,001
Closing balance (52,324) (44,316)
Derecognition 20,142 18,007
Net increase / (Reversal) (28,150) (14,001)
Loans to corporate entities [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (4,807) (7,953)
Net increase / (Reversal) (1,468) 2,836
Closing balance (5,453) (4,807)
Derecognition 822 310
Net increase / (Reversal) 1,468 (2,836)
Micro Small And Medium Companies [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (7,391) (6,369)
Net increase / (Reversal) (5,860) (3,376)
Closing balance (9,590) (7,391)
Derecognition 3,661 2,354
Net increase / (Reversal) 5,860 3,376
Foreign Loans [Member] | Foreign countries [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (7,898) (12,870)
Net increase / (Reversal) (885) (62)
Closing balance (7,000) (7,898)
Derecognition 1,783 5,034
Net increase / (Reversal) 885 62
Stage One [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (11,449) (9,805)
Transfer to Stage 2 2,997 2,289
Transfer to Stage 3 339 287
Cure from Stage 2 (2,469) (1,354)
Net increase / (Reversal) 962 (2,767)
Closing balance (9,664) (11,449)
Cure from Stage 3 (44) (99)
Net increase / (Reversal) (962) 2,767
Stage One [member] | Loans to corporate entities [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (413) (740)
Transfer to Stage 2 6 36
Transfer to Stage 3 1 8
Cure from Stage 2 (127) (132)
Net increase / (Reversal) 56 417
Closing balance (480) (413)
Cure from Stage 3 (3) (2)
Net increase / (Reversal) (56) (417)
Stage One [member] | Micro Small And Medium Companies [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (1,812) (1,273)
Transfer to Stage 2 767 592
Transfer to Stage 3 98 64
Cure from Stage 2 (806) (464)
Net increase / (Reversal) 355 (680)
Closing balance (1,431) (1,812)
Cure from Stage 3 (33) (51)
Net increase / (Reversal) (355) 680
Stage One [member] | Foreign Loans [Member] | Foreign countries [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (2,373) (2,389)
Transfer to Stage 2 179 226
Transfer to Stage 3 18 12
Cure from Stage 2 (91) (179)
Net increase / (Reversal) (67) 3
Closing balance (2,339) (2,373)
Cure from Stage 3 (5) (46)
Net increase / (Reversal) 67 (3)
Stage Two [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (8,275) (7,882)
Transfer to Stage 2 2,469 1,354
Transfer to Stage 3 6,326 4,223
Cure from Stage 2 (2,997) (2,289)
Net increase / (Reversal) (6,895) (3,200)
Closing balance (9,923) (8,275)
Cure from Stage 3 (551) (481)
Net increase / (Reversal) 6,895 3,200
Stage Two [Member] | Loans to corporate entities [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (865) (1,261)
Transfer to Stage 2 127 132
Transfer to Stage 3 31 32
Cure from Stage 2 (6) (36)
Net increase / (Reversal) 219 274
Closing balance (503) (865)
Cure from Stage 3 (9) (6)
Net increase / (Reversal) (219) (274)
Stage Two [Member] | Micro Small And Medium Companies [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (1,556) (1,337)
Transfer to Stage 2 806 464
Transfer to Stage 3 1,055 685
Cure from Stage 2 (767) (592)
Net increase / (Reversal) (1,564) (664)
Closing balance (2,227) (1,556)
Cure from Stage 3 (201) (112)
Net increase / (Reversal) 1,564 664
Stage Two [Member] | Foreign Loans [Member] | Foreign countries [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (1,353) (2,029)
Transfer to Stage 2 91 179
Transfer to Stage 3 592 867
Cure from Stage 2 (179) (226)
Net increase / (Reversal) (478) 140
Closing balance (1,546) (1,353)
Cure from Stage 3 (219) (284)
Net increase / (Reversal) 478 (140)
Stage three [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (24,592) (30,635)
Transfer to Stage 2 44 99
Transfer to Stage 3 551 481
Cure from Stage 2 (339) (287)
Net increase / (Reversal) (22,217) (8,034)
Closing balance (32,737) (24,592)
Cure from Stage 3 (6,326) (4,223)
Derecognition 20,142 18,007
Net increase / (Reversal) 22,217 8,034
Stage three [Member] | Loans to corporate entities [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (3,529) (5,952)
Transfer to Stage 2 3 2
Transfer to Stage 3 9 6
Cure from Stage 2 (1) (8)
Net increase / (Reversal) (1,743) 2,145
Closing balance (4,470) (3,529)
Cure from Stage 3 (31) (32)
Derecognition 822 310
Net increase / (Reversal) 1,743 (2,145)
Stage three [Member] | Micro Small And Medium Companies [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (4,023) (3,759)
Transfer to Stage 2 33 51
Transfer to Stage 3 201 112
Cure from Stage 2 (98) (64)
Net increase / (Reversal) (4,651) (2,032)
Closing balance (5,932) (4,023)
Cure from Stage 3 (1,055) (685)
Derecognition 3,661 2,354
Net increase / (Reversal) 4,651 2,032
Stage three [Member] | Foreign Loans [Member] | Foreign countries [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (4,172) (8,452)
Transfer to Stage 2 5 46
Transfer to Stage 3 219 284
Cure from Stage 2 (18) (12)
Net increase / (Reversal) (340) (205)
Closing balance (3,115) (4,172)
Cure from Stage 3 (592) (867)
Derecognition 1,783 5,034
Net increase / (Reversal) 340 205
Individuals [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (24,220) (21,130)
Net increase / (Reversal) (19,937) (13,399)
Closing balance (30,281) (24,220)
Derecognition 13,876 10,309
Net increase / (Reversal) 19,937 13,399
Individuals [member] | Stage One [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (6,851) (5,403)
Transfer to Stage 2 2,045 1,435
Transfer to Stage 3 222 203
Cure from Stage 2 (1,445) (579)
Net increase / (Reversal) 618 (2,507)
Closing balance (5,414) (6,851)
Net increase / (Reversal) (618) 2,507
Individuals [member] | Stage Two [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (4,501) (3,255)
Transfer to Stage 2 1,445 579
Transfer to Stage 3 4,648 2,639
Cure from Stage 2 (2,045) (1,435)
Net increase / (Reversal) (5,072) (2,950)
Closing balance (5,647) (4,501)
Cure from Stage 3 (122) (79)
Net increase / (Reversal) 5,072 2,950
Individuals [member] | Stage three [Member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (12,868) (12,472)
Transfer to Stage 3 122 79
Cure from Stage 2 (222) (203)
Net increase / (Reversal) (15,483) (7,942)
Closing balance (19,220) (12,868)
Cure from Stage 3 (4,648) (2,639)
Derecognition 13,876 10,309
Net increase / (Reversal) R$ 15,483 R$ 7,942