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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, 2018	Dec. 31, 2017
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]
Gross carrying amount	R$ 77	R$ 73
Fair Value	161	148
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	77	73
Fair Value	R$ 161	R$ 148

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
-Note Effective 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 8
-Subparagraph h
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_8_h&doctype=Standard
-URIDate 2017-03-09

+ 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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