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Loan and Lease Operations Portfolio - Summary of Reconciliation of Expected Loan Losses for Loan Operations and Lease Operations (Detail) - Expected credit losses [member] - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of loans and lease operations [Line Items]    
Beginning balance R$ (33,509) R$ (36,469)
Derecognition 14,299 13,547
Net increase / (Reversal) (18,298) (10,587)
Closing balance (37,508) (33,509)
Corporate [member]    
Disclosure of loans and lease operations [Line Items]    
Beginning balance (9,367) (11,452)
Derecognition 884 1,172
Net increase / (Reversal) 1,492 913
Closing balance (6,991) (9,367)
Micro/Small and medium companies [member]    
Disclosure of loans and lease operations [Line Items]    
Beginning balance (4,532) (5,404)
Derecognition 1,995 2,471
Net increase / (Reversal) (1,906) (1,599)
Closing balance (4,443) (4,532)
Individuals [member]    
Disclosure of loans and lease operations [Line Items]    
Beginning balance (14,425) (14,830)
Derecognition 9,710 8,520
Net increase / (Reversal) (14,738) (8,115)
Closing balance (19,453) (14,425)
Foreign [member] | Foreign loans - Latin America [member]    
Disclosure of loans and lease operations [Line Items]    
Beginning balance (5,185) (4,783)
Derecognition 1,710 1,384
Net increase / (Reversal) (3,146) (1,786)
Closing balance (6,621) (5,185)
Stage 1 [member]    
Disclosure of loans and lease operations [Line Items]    
Beginning balance (6,931) (6,447)
Transfer to Stage 2 1,388 1,070
Transfer to Stage 3 373 409
Cure from the Stage 2 (730) (1,483)
Cure from the Stage 3 (50) (134)
Net increase / (Reversal) (2,216) (346)
Closing balance (8,166) (6,931)
Stage 1 [member] | Corporate [member]    
Disclosure of loans and lease operations [Line Items]    
Beginning balance (531) (451)
Transfer to Stage 2 59 7
Transfer to Stage 3 2 1
Cure from the Stage 2 (170) (259)
Cure from the Stage 3   (85)
Net increase / (Reversal) 123 256
Closing balance (517) (531)
Stage 1 [member] | Micro/Small and medium companies [member]    
Disclosure of loans and lease operations [Line Items]    
Beginning balance (1,112) (1,149)
Transfer to Stage 2 225 213
Transfer to Stage 3 71 75
Cure from the Stage 2 (136) (177)
Cure from the Stage 3 (10) (4)
Net increase / (Reversal) (119) (70)
Closing balance (1,081) (1,112)
Stage 1 [member] | Individuals [member]    
Disclosure of loans and lease operations [Line Items]    
Beginning balance (3,892) (3,834)
Transfer to Stage 2 846 708
Transfer to Stage 3 282 313
Cure from the Stage 2 (264) (388)
Net increase / (Reversal) (2,187) (691)
Closing balance (5,215) (3,892)
Stage 1 [member] | Foreign [member] | Foreign loans - Latin America [member]    
Disclosure of loans and lease operations [Line Items]    
Beginning balance (1,396) (1,013)
Transfer to Stage 2 258 142
Transfer to Stage 3 18 20
Cure from the Stage 2 (160) (659)
Cure from the Stage 3 (40) (45)
Net increase / (Reversal) (33) 159
Closing balance (1,353) (1,396)
Stage 2 [member]    
Disclosure of loans and lease operations [Line Items]    
Beginning balance (4,451) (5,307)
Transfer to Stage 1 730 1,483
Transfer to Stage 3 4,438 4,287
Cure from the Stage 1 (1,388) (1,070)
Cure from the Stage 3 (566) (892)
Net increase / (Reversal) (5,320) (2,952)
Closing balance (6,557) (4,451)
Stage 2 [member] | Corporate [member]    
Disclosure of loans and lease operations [Line Items]    
Beginning balance (595) (1,174)
Transfer to Stage 1 170 259
Transfer to Stage 3 269 193
Cure from the Stage 1 (59) (7)
Cure from the Stage 3   (147)
Net increase / (Reversal) 109 281
Closing balance (106) (595)
Stage 2 [member] | Micro/Small and medium companies [member]    
Disclosure of loans and lease operations [Line Items]    
Beginning balance (557) (701)
Transfer to Stage 1 136 177
Transfer to Stage 3 490 430
Cure from the Stage 1 (225) (213)
Cure from the Stage 3 (143) (195)
Net increase / (Reversal) (576) (55)
Closing balance (875) (557)
Stage 2 [member] | Individuals [member]    
Disclosure of loans and lease operations [Line Items]    
Beginning balance (2,116) (2,209)
Transfer to Stage 1 264 388
Transfer to Stage 3 3,117 3,258
Cure from the Stage 1 (846) (708)
Cure from the Stage 3 (155) (145)
Net increase / (Reversal) (3,075) (2,700)
Closing balance (2,811) (2,116)
Stage 2 [member] | Foreign [member] | Foreign loans - Latin America [member]    
Disclosure of loans and lease operations [Line Items]    
Beginning balance (1,183) (1,223)
Transfer to Stage 1 160 659
Transfer to Stage 3 562 406
Cure from the Stage 1 (258) (142)
Cure from the Stage 3 (268) (405)
Net increase / (Reversal) (1,778) (478)
Closing balance (2,765) (1,183)
Stage 3 [member]    
Disclosure of loans and lease operations [Line Items]    
Beginning balance (22,127) (24,715)
Transfer to Stage 1 50 134
Transfer to Stage 2 566 892
Cure from the Stage 1 (373) (409)
Cure from the Stage 2 (4,438) (4,287)
Derecognition 14,299 13,547
Net increase / (Reversal) (10,762) (7,289)
Closing balance (22,785) (22,127)
Stage 3 [member] | Corporate [member]    
Disclosure of loans and lease operations [Line Items]    
Beginning balance (8,241) (9,827)
Transfer to Stage 1   85
Transfer to Stage 2   147
Cure from the Stage 1 (2) (1)
Cure from the Stage 2 (269) (193)
Derecognition 884 1,172
Net increase / (Reversal) 1,260 376
Closing balance (6,368) (8,241)
Stage 3 [member] | Micro/Small and medium companies [member]    
Disclosure of loans and lease operations [Line Items]    
Beginning balance (2,863) (3,554)
Transfer to Stage 1 10 4
Transfer to Stage 2 143 195
Cure from the Stage 1 (71) (75)
Cure from the Stage 2 (490) (430)
Derecognition 1,995 2,471
Net increase / (Reversal) (1,211) (1,474)
Closing balance (2,487) (2,863)
Stage 3 [member] | Individuals [member]    
Disclosure of loans and lease operations [Line Items]    
Beginning balance (8,417) (8,787)
Transfer to Stage 2 155 145
Cure from the Stage 1 (282) (313)
Cure from the Stage 2 (3,117) (3,258)
Derecognition 9,710 8,520
Net increase / (Reversal) (9,476) (4,724)
Closing balance (11,427) (8,417)
Stage 3 [member] | Foreign [member] | Foreign loans - Latin America [member]    
Disclosure of loans and lease operations [Line Items]    
Beginning balance (2,606) (2,547)
Transfer to Stage 1 40 45
Transfer to Stage 2 268 405
Cure from the Stage 1 (18) (20)
Cure from the Stage 2 (562) (406)
Derecognition 1,710 1,384
Net increase / (Reversal) (1,335) (1,467)
Closing balance R$ (2,503) R$ (2,606)