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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

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Balance Type: | credit
Period Type: | duration

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- Definition Income from banking product. + References No definition available. + Details
Name: | itub_IncomeFromBankingProduct
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Income related to insurance, private pension and capitalization operations before claim and selling expenses. + References No definition available. + Details
Name: | itub_IncomeRelatedToInsurancePrivatePensionAndCapitalizationOperationsBeforeClaimAndSellingExpenses
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Increase (decrease) in insurance liabilities, Cost of Credit. + References No definition available. + Details
Name: | itub_IncreaseDecreaseInInsuranceLiabilitiesCostOfCredit
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Investments in joint ventures and associates. + References No definition available. + Details
Name: | itub_InvestmentsInJointVenturesAndAssociates
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Miscellaneous other operating income expense. + References No definition available. + Details
Name: | itub_MiscellaneousOtherOperatingIncomeExpense
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Net interest income. + References No definition available. + Details
Name: | itub_NetInterestIncome
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Non interest expense 1. + References No definition available. + Details
Name: | itub_NonInterestExpense1
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Profit (loss) before tax and social contribution. + References No definition available. + Details
Name: | itub_ProfitLossBeforeTaxAndSocialContribution
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | ifrs-full_SegmentsAxis=itub_RetailBankingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_SegmentsAxis=itub_WholesaleBankingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=itub_MarketAndCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=itub_ItaUnibancoSaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=itub_AdjustmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |