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Segment Information - Summary of Operating Segments (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2017
Disclosure of operating segments [line items]        
Banking product R$ 104,200 R$ 111,523 R$ 118,422  
Interest margin 60,705 71,242 79,855  
Banking service fees 36,809 34,448 31,918  
Income related to insurance and private pension operations before claim and selling expenses 3,961 4,699 5,265  
Other income 2,725 1,134 1,384  
Cost of Credit 8,954 (19,774) (22,870)  
Claims 1,228 (1,192) (1,485)  
Operating margin 94,018 90,557 94,067  
Other operating income (expenses) (63,410) (59,975) (58,388)  
Non-interest expenses (57,538) (53,494) (50,905)  
Tax expenses for ISS, PIS and COFINS and Other (6,619) (7,031) (8,011)  
Share of profit or (loss) in associates and joint ventures 747 550 528  
Net income before income tax and social contribution 30,608 30,582 35,679  
Income tax and social contribution (4,969) (7,357) (13,663)  
Non-controlling interest in subsidiaries (732) (32) (389)  
Net income 24,907 23,193 21,627  
Total assets 1,552,797 1,436,239 1,351,314 R$ 1,351,314
Total liabilities 1,402,331 1,291,883 1,218,930 1,218,930
Investments in associates and joint ventures 12,019 5,055 5,073 5,073
Fixed assets, net 7,302 7,359 8,042 8,042
Goodwill and Intangible assets, net 19,329 19,383 17,056 R$ 17,056
Retail Banking [Member]        
Disclosure of operating segments [line items]        
Banking product 72,182 69,921 70,496  
Interest margin 40,243 38,570 40,073  
Banking service fees 25,131 24,096 22,659  
Income related to insurance and private pension operations before claim and selling expenses 6,808 7,255 7,764  
Cost of Credit 12,526 (12,166) (14,394)  
Claims 1,160 (1,222) (1,426)  
Operating margin 58,496 56,533 54,676  
Other operating income (expenses) (40,002) (37,601) (37,202)  
Non-interest expenses (35,296) (33,186) (32,883)  
Tax expenses for ISS, PIS and COFINS and Other (4,706) (4,415) (4,319)  
Net income before income tax and social contribution 18,494 18,932 17,474  
Income tax and social contribution (6,939) (7,107) (6,328)  
Non-controlling interest in subsidiaries (184) (166) (223)  
Net income 11,371 11,659 10,923  
Total assets 1,042,145 970,137 909,779  
Total liabilities 1,005,194 934,835 877,792  
Investments in associates and joint ventures 1,220 1,168 1,325  
Fixed assets, net 5,526 5,105 5,635  
Goodwill and Intangible assets, net 6,845 8,739 7,957  
Wholesale Banking [member]        
Disclosure of operating segments [line items]        
Banking product 29,389 28,748 30,498  
Interest margin 18,930 19,426 21,929  
Banking service fees 9,810 8,876 8,072  
Income related to insurance and private pension operations before claim and selling expenses 649 446 497  
Cost of Credit 1,540 (5,829) (10,586)  
Claims 68 (53) (59)  
Operating margin 27,781 22,866 19,853  
Other operating income (expenses) (15,217) (14,523) (13,410)  
Non-interest expenses (13,817) (13,265) (12,034)  
Tax expenses for ISS, PIS and COFINS and Other (1,400) (1,258) (1,376)  
Net income before income tax and social contribution 12,564 8,343 6,443  
Income tax and social contribution (3,829) (2,412) (1,081)  
Non-controlling interest in subsidiaries (550) 117 79  
Net income 8,185 6,048 5,441  
Total assets 655,393 604,384 585,088  
Total liabilities 597,528 548,185 525,390  
Fixed assets, net 879 1,290 1,177  
Goodwill and Intangible assets, net 8,178 7,694 7,276  
Market And Corporation [Member]        
Disclosure of operating segments [line items]        
Banking product 10,246 10,623 9,412  
Interest margin 9,912 10,515 9,264  
Banking service fees 138 42 59  
Income related to insurance and private pension operations before claim and selling expenses 196 66 89  
Cost of Credit   (6) 71  
Operating margin 10,246 10,617 9,483  
Other operating income (expenses) (1,070) (1,647) (2,387)  
Non-interest expenses (331) (831) (1,616)  
Tax expenses for ISS, PIS and COFINS and Other (739) (816) (771)  
Net income before income tax and social contribution 9,176 8,970 7,096  
Income tax and social contribution (2,964) (1,775) (1,237)  
Non-controlling interest in subsidiaries (35) (23) (1)  
Net income 6,177 7,172 5,858  
Total assets 142,853 119,309 116,401  
Total liabilities 93,546 71,873 80,810  
Investments in associates and joint ventures 11,438 3,986 3,106  
Ita Unibanco SA [Member]        
Disclosure of operating segments [line items]        
Banking product 111,817 109,292 110,406  
Interest margin 69,085 68,511 71,266  
Banking service fees 35,079 33,014 30,790  
Income related to insurance and private pension operations before claim and selling expenses 7,653 7,767 8,350  
Cost of Credit 14,066 (18,001) (24,909)  
Claims 1,228 (1,275) (1,485)  
Operating margin 96,523 90,016 84,012  
Other operating income (expenses) (56,289) (53,771) (52,999)  
Non-interest expenses (49,444) (47,282) (46,533)  
Tax expenses for ISS, PIS and COFINS and Other (6,845) (6,489) (6,466)  
Net income before income tax and social contribution 40,234 36,245 31,013  
Income tax and social contribution (13,732) (11,294) (8,646)  
Non-controlling interest in subsidiaries (769) (72) (145)  
Net income 25,733 24,879 22,222  
Total assets 1,649,613 1,503,503 1,427,084  
Total liabilities 1,505,490 1,364,566 1,299,869  
Investments in associates and joint ventures 12,658 5,154 4,431  
Fixed assets, net 6,405 6,395 6,812  
Goodwill and Intangible assets, net 15,023 16,433 15,233  
Adjustments [Member]        
Disclosure of operating segments [line items]        
Banking product (7,617) 2,231 8,016  
Interest margin (8,380) 2,731 8,589  
Banking service fees 1,730 1,434 1,128  
Income related to insurance and private pension operations before claim and selling expenses (3,692) (3,068) (3,085)  
Other income 2,725 1,134 1,384  
Cost of Credit (5,112) (1,773) 2,039  
Claims   83    
Operating margin (2,505) 541 10,055  
Other operating income (expenses) (7,121) (6,204) (5,389)  
Non-interest expenses (8,094) (6,212) (4,372)  
Tax expenses for ISS, PIS and COFINS and Other 226 (542) (1,545)  
Share of profit or (loss) in associates and joint ventures 747 550 528  
Net income before income tax and social contribution (9,626) (5,663) 4,666  
Income tax and social contribution 8,763 3,937 (5,017)  
Non-controlling interest in subsidiaries 37 40 (244)  
Net income (826) (1,686) (595)  
Total assets (96,816) (67,264) (75,770)  
Total liabilities (103,159) (72,683) (80,939)  
Investments in associates and joint ventures (639) (99) 642  
Fixed assets, net 897 964 1,230  
Goodwill and Intangible assets, net R$ 4,306 R$ 2,950 R$ 1,823