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Segment Information - Summary of Operating Segments (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of operating segments [line items]      
Operating revenues R$ 117,079 R$ 104,200 R$ 111,523
Interest margin 69,350 60,705 71,242
Revenue from banking services 39,032 36,809 34,448
Income related to insurance and private pension operations before claim and selling expenses 4,553 3,961 4,699
Other revenues 4,144 2,725 1,134
Cost of Credit (17,272) (8,954) (19,774)
Claims (1,295) (1,228) (1,192)
Operating margin 98,512 94,018 90,557
Other operating income (expenses) (67,269) (63,410) (59,975)
Non-interest expenses (61,012) (57,538) (53,494)
Tax expenses for ISS, PIS and COFINS and Other (7,572) (6,619) (7,031)
Share of profit or (loss) in associates and joint ventures 1,315 747 550
Net income before income tax and social contribution 31,243 30,608 30,582
Income tax and social contribution (3,430) (4,969) (7,357)
Non-controlling interest in subsidiaries (700) (732) (32)
Net income 27,113 24,907 23,193
Total assets 1,637,481 1,552,797 1,436,239
Total liabilities 1,488,016 1,402,331 1,291,883
Investments in associates and joint ventures 15,097 12,019 5,055
Fixed assets, net 7,166 7,302 7,359
Goodwill and Intangible assets, net 19,719 19,329 19,383
Retail Banking [Member]      
Disclosure of operating segments [line items]      
Operating revenues 79,227 72,182 69,921
Interest margin 46,764 40,243 38,570
Revenue from banking services 25,411 25,131 24,096
Income related to insurance and private pension operations before claim and selling expenses 7,052 6,808 7,255
Other revenues 0 0  
Cost of Credit (16,072) (12,526) (12,166)
Claims (1,206) (1,160) (1,222)
Operating margin 61,949 58,496 56,533
Other operating income (expenses) (41,430) (40,002) (37,601)
Non-interest expenses (36,346) (35,296) (33,186)
Tax expenses for ISS, PIS and COFINS and Other (5,084) (4,706) (4,415)
Share of profit or (loss) in associates and joint ventures 0    
Net income before income tax and social contribution 20,519 18,494 18,932
Income tax and social contribution (7,095) (6,939) (7,107)
Non-controlling interest in subsidiaries (198) (184) (166)
Net income 13,226 11,371 11,659
Total assets 1,056,275 1,042,145 970,137
Total liabilities 1,013,186 1,005,194 934,835
Investments in associates and joint ventures 1,911 1,220 1,168
Fixed assets, net 5,252 5,526 5,105
Goodwill and Intangible assets, net 6,681 6,845 8,739
Wholesale Banking [member]      
Disclosure of operating segments [line items]      
Operating revenues 30,650 29,389 28,748
Interest margin 18,778 18,930 19,426
Revenue from banking services 11,306 9,810 8,876
Income related to insurance and private pension operations before claim and selling expenses 566 649 446
Other revenues 0 0  
Cost of Credit (2,082) (1,540) (5,829)
Claims (59) (68) (53)
Operating margin 28,509 27,781 22,866
Other operating income (expenses) (15,403) (15,217) (14,523)
Non-interest expenses (13,940) (13,817) (13,265)
Tax expenses for ISS, PIS and COFINS and Other (1,463) (1,400) (1,258)
Share of profit or (loss) in associates and joint ventures 0    
Net income before income tax and social contribution 13,106 12,564 8,343
Income tax and social contribution (3,856) (3,829) (2,412)
Non-controlling interest in subsidiaries (444) (550) 117
Net income 8,806 8,185 6,048
Total assets 682,271 655,393 604,384
Total liabilities 625,614 597,528 548,185
Investments in associates and joint ventures 0    
Fixed assets, net 1,160 879 1,290
Goodwill and Intangible assets, net 7,645 8,178 7,694
Market And Corporation [Member]      
Disclosure of operating segments [line items]      
Operating revenues 9,913 10,246 10,623
Interest margin 9,088 9,912 10,515
Revenue from banking services 590 138 42
Income related to insurance and private pension operations before claim and selling expenses 235 196 66
Other revenues 0 0  
Cost of Credit 0   (6)
Claims 0    
Operating margin 9,913 10,246 10,617
Other operating income (expenses) (986) (1,070) (1,647)
Non-interest expenses (365) (331) (831)
Tax expenses for ISS, PIS and COFINS and Other (621) (739) (816)
Share of profit or (loss) in associates and joint ventures 0    
Net income before income tax and social contribution 8,927 9,176 8,970
Income tax and social contribution (2,545) (2,964) (1,775)
Non-controlling interest in subsidiaries (51) (35) (23)
Net income 6,331 6,177 7,172
Total assets 147,901 142,853 119,309
Total liabilities 104,799 93,546 71,873
Investments in associates and joint ventures 13,666 11,438 3,986
Fixed assets, net 0    
Goodwill and Intangible assets, net 0    
Ita Unibanco SA [Member]      
Disclosure of operating segments [line items]      
Operating revenues 119,790 111,817 109,292
Interest margin 74,630 69,085 68,511
Revenue from banking services 37,307 35,079 33,014
Income related to insurance and private pension operations before claim and selling expenses 7,853 7,653 7,767
Other revenues 0 0  
Cost of Credit (18,154) (14,066) (18,001)
Claims (1,265) (1,228) (1,275)
Operating margin 100,371 96,523 90,016
Other operating income (expenses) (57,819) (56,289) (53,771)
Non-interest expenses (50,651) (49,444) (47,282)
Tax expenses for ISS, PIS and COFINS and Other (7,168) (6,845) (6,489)
Share of profit or (loss) in associates and joint ventures 0    
Net income before income tax and social contribution 42,552 40,234 36,245
Income tax and social contribution (13,496) (13,732) (11,294)
Non-controlling interest in subsidiaries (693) (769) (72)
Net income 28,363 25,733 24,879
Total assets 1,738,713 1,649,613 1,503,503
Total liabilities 1,595,865 1,505,490 1,364,566
Investments in associates and joint ventures 15,577 12,658 5,154
Fixed assets, net 6,412 6,405 6,395
Goodwill and Intangible assets, net 14,326 15,023 16,433
Adjustments [Member]      
Disclosure of operating segments [line items]      
Operating revenues (2,711) (7,617) 2,231
Interest margin (5,280) (8,380) 2,731
Revenue from banking services 1,725 1,730 1,434
Income related to insurance and private pension operations before claim and selling expenses (3,300) (3,692) (3,068)
Other revenues 4,144 2,725 1,134
Cost of Credit 882 5,112 (1,773)
Claims (30)   83
Operating margin (1,859) (2,505) 541
Other operating income (expenses) (9,450) (7,121) (6,204)
Non-interest expenses (10,361) (8,094) (6,212)
Tax expenses for ISS, PIS and COFINS and Other (404) 226 (542)
Share of profit or (loss) in associates and joint ventures 1,315 747 550
Net income before income tax and social contribution (11,309) (9,626) (5,663)
Income tax and social contribution 10,066 8,763 3,937
Non-controlling interest in subsidiaries (7) 37 40
Net income (1,250) (826) (1,686)
Total assets (101,232) (96,816) (67,264)
Total liabilities (107,849) (103,159) (72,683)
Investments in associates and joint ventures (480) (639) (99)
Fixed assets, net 754 897 964
Goodwill and Intangible assets, net R$ 5,393 R$ 4,306 R$ 2,950