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Financial Assets at Fair Value Through Other Comprehensive Income-Securities - Summary of Equity Instruments at Fair Value Through Other Comprehensive Income-Securities by Maturity (Detail) - BRL (R$) R$ in Millions	Dec. 31, 2019	Dec. 31, 2018
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]
Gross carrying amount	R$ 83	R$ 77
Fair Value	149	161
Non-stated maturity [Member]
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]
Gross carrying amount	83	77
Fair Value	R$ 149	R$ 161

X

- Definition

The amount of current investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: Investments in equity instruments designated at fair value through other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 8
-Subparagraph h
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_8_h&doctype=Standard
-URIDate 2019-03-27

+ Details

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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

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X

- Definition

Current equity Instruments at cost through other comprehensive income

+ References

No definition available.

+ Details

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Namespace Prefix:	itub_
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- Details

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