XML 197 R145.htm IDEA: XBRL DOCUMENT
v3.19.1

Stockholders' equity - Summary of Change in Shares of Paid-in Capital and Reconciliation of Balances (Detail) - BRL (R$) R$ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Feb. 22, 2018 | Dec. 15, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of classes of share capital [line items] |  |  |  |  |
Shares of capital stock, beginning balance |  |  | 9,825,771,656 | 9,873,461,313 |
Stock Split - ESM of 07/27/2018 - Approved on 10/31/2018 |  |  | 3,268,045,116 |  |
Cancellation of Shares |  |  | (14,424,206) | (47,689,657) |
Shares of capital stock, ending balance |  |  | 9,804,135,348 | 9,825,771,656 | 9,873,461,313
Treasury shares, beginning balance |  |  | 128,825,880 | 104,411,304 |
Purchase of shares |  |  | 13,100,000 | 126,295,705 |
Cancellation of Shares |  |  | (14,424,206) | (47,689,657) |
Result of delivery of treasury shares |  |  | (29,623,265) | (54,191,472) |
Stock Split - ESM of 07/27/2018 - Approved on 10/31/2018 |  |  | 28,677,977 |  |
Treasury shares, ending balance |  |  | 83,614,426 | 128,825,880 | 104,411,304
Outstanding shares |  |  | 9,720,520,922 | 9,696,945,776 | 9,769,050,010
Beginning balance |  |  | R$ 97,148 | R$ 97,148 |
Outstanding shares |  |  | 9,720,520,922 | 9,696,945,776 | 9,769,050,010
Stock Split - ESM of 07/27/2018 - Approved on 10/31/2018 |  |  | R$ 0 |  |
Cancellation of Shares - Meeting of the Board of Directors |  |  | 0 | R$ 0 |
Ending balance |  |  | 97,148 | 97,148 | R$ 97,148
Treasury shares, value |  |  | (2,743) |  |
Purchase of shares |  |  | (510) | (3,089) | (947)
Cancellation of Shares - Meeting of the Board of Directors |  |  | 0 |  |
Result of delivery of treasury shares |  |  | 1,321 | 1,114 | R$ 731
Treasury shares, value |  |  | R$ (1,820) | R$ (2,743) |
Ordinary shares [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Shares of capital stock, beginning balance |  |  | 4,979,926,668 | 5,027,616,325 |
Stock Split - ESM of 07/27/2018 - Approved on 10/31/2018 |  |  | 1,652,763,453 |  |
Cancellation of Shares | (14,424,206) | (31,793,105) | (14,424,206) | (47,689,657) |
Shares of capital stock, ending balance |  |  | 4,958,290,359 | 4,979,926,668 | 5,027,616,325
Treasury shares, beginning balance |  |  | 21,636,309 | 4,611 |
Purchase of shares |  |  |  | 69,321,355 |
Cancellation of Shares | (14,424,206) | (31,793,105) | (14,424,206) | (47,689,657) |
Treasury shares, ending balance |  |  |  | 21,636,309 | 4,611
Outstanding shares |  |  | 4,958,290,359 | 4,958,290,359 | 5,027,611,714
Outstanding shares |  |  | 4,958,290,359 | 4,958,290,359 | 5,027,611,714
Preference shares [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Shares of capital stock, beginning balance |  |  | 4,845,844,988 | 4,845,844,988 |
Stock Split - ESM of 07/27/2018 - Approved on 10/31/2018 |  |  | 1,615,281,663 |  |
Shares of capital stock, ending balance |  |  | 4,845,844,989 | 4,845,844,988 | 4,845,844,988
Treasury shares, beginning balance |  |  | 107,189,571 | 104,406,693 |
Purchase of shares |  |  | 13,100,000 | 56,974,350 |
Result of delivery of treasury shares |  |  | (29,623,265) | (54,191,472) |
Stock Split - ESM of 07/27/2018 - Approved on 10/31/2018 |  |  | 28,677,977 |  |
Treasury shares, ending balance |  |  | 83,614,426 | 107,189,571 | 104,406,693
Outstanding shares |  |  | 4,762,230,563 | 4,738,655,417 | 4,741,438,296
Outstanding shares |  |  | 4,762,230,563 | 4,738,655,417 | 4,741,438,296
Treasury shares [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Treasury shares, value |  |  | R$ (2,743) | R$ (1,882) |
Purchase of shares |  |  | (510) | (3,089) | R$ (947)
Cancellation of Shares - Meeting of the Board of Directors |  |  | 534 | 1,178 | 2,670
Result of delivery of treasury shares |  |  | 899 | 1,050 | 748
Stock Split - ESM of 07/27/2018 - Approved on 10/31/2018 |  |  | 0 |  |
Treasury shares, value |  |  | R$ (1,820) | R$ (2,743) | R$ (1,882)
Brazil [Member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Shares of capital stock, beginning balance |  |  | 6,623,047,270 | 6,660,471,062 |
Shares of capital stock, ending balance |  |  | 6,537,131,486 | 6,623,047,270 | 6,660,471,062
Beginning balance |  |  | R$ 65,482 | R$ 65,534 |
Ending balance |  |  | R$ 64,776 | R$ 65,482 | R$ 65,534
Brazil [Member] | Ordinary shares [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Shares of capital stock, beginning balance |  |  | 4,948,610,259 | 5,003,025,466 |
Shares of capital stock, ending balance |  |  | 4,928,076,320 | 4,948,610,259 | 5,003,025,466
Brazil [Member] | Preference shares [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Shares of capital stock, beginning balance |  |  | 1,674,437,011 | 1,657,445,596 |
Shares of capital stock, ending balance |  |  | 1,609,055,166 | 1,674,437,011 | 1,657,445,596
Foreign [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Shares of capital stock, beginning balance |  |  | 3,202,724,386 | 3,212,990,251 |
Shares of capital stock, ending balance |  |  | 3,267,003,862 | 3,202,724,386 | 3,212,990,251
Beginning balance |  |  | R$ 31,666 | R$ 31,614 |
Ending balance |  |  | R$ 32,372 | R$ 31,666 | R$ 31,614
Foreign [member] | Ordinary shares [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Shares of capital stock, beginning balance |  |  | 31,316,409 | 24,590,859 |
Shares of capital stock, ending balance |  |  | 30,214,039 | 31,316,409 | 24,590,859
Foreign [member] | Preference shares [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Shares of capital stock, beginning balance |  |  | 3,171,407,977 | 3,188,399,392 |
Shares of capital stock, ending balance |  |  | 3,236,789,823 | 3,171,407,977 | 3,188,399,392

X
- Definition The amount of treasury stock cancelled during the period. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_106_d&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_CancellationOfTreasuryShares
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfClassesOfShareCapitalLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The nominal value of capital issued. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_e&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_IssuedCapital
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The number of shares issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_106_d&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_NumberOfSharesIssued
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_iv&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_NumberOfSharesOutstanding
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The decrease in equity resulting from the purchase of treasury shares. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_106_d&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_PurchaseOfTreasuryShares
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The increase in equity resulting from the sale or issue of treasury shares. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_106_d&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_SaleOrIssueOfTreasuryShares
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition An entity’s own equity instruments, held by the entity or other members of the consolidated group. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_e&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 32 -IssueDate 2017-01-01 -Paragraph 34 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=32&date=2017-03-01&anchor=para_34&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_TreasuryShares
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Cancellation of shares + References No definition available. + Details
Name: | itub_CancellationOfShares
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Cancellation of treasury stock shares. + References No definition available. + Details
Name: | itub_CancellationOfTreasuryStockShares
Namespace Prefix: | itub_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of treasury shares. + References No definition available. + Details
Name: | itub_NumberOfTreasuryShares
Namespace Prefix: | itub_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number Of Treasury Shares Purchase + References No definition available. + Details
Name: | itub_NumberOfTreasurySharesPurchase
Namespace Prefix: | itub_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Sale or issue of treasury shares, shares. + References No definition available. + Details
Name: | itub_SaleOrIssueOfTreasurySharesShares
Namespace Prefix: | itub_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Stock split new shares amount outstanding. + References No definition available. + Details
Name: | itub_StockSplitNewSharesAmountOutstanding
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Stock split new shares outstanding. + References No definition available. + Details
Name: | itub_StockSplitNewSharesOutstanding
Namespace Prefix: | itub_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Treasury shares stock split outstanding. + References No definition available. + Details
Name: | itub_TreasurySharesStockSplitOutstanding
Namespace Prefix: | itub_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Treasury stock split outstanding amount. + References No definition available. + Details
Name: | itub_TreasuryStockSplitOutstandingAmount
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=ifrs-full_OrdinarySharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=ifrs-full_PreferenceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ComponentsOfEquityAxis=ifrs-full_TreasurySharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_BR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=ifrs-full_ForeignCountriesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |