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Post-Employment Benefits - Additional Information (Detail) - BRL (R$) R$ in Millions	Dec. 31, 2019	Dec. 31, 2018
Disclosure of defined benefit plans [line items]
Defined benefit plan assets	R$ 22,732	R$ 18,808
Medical care cost [member]
Disclosure of defined benefit plans [line items]
Percentage of actuarial method assumption	8.16%
Actuarial assumption of retirement age [member]
Disclosure of defined benefit plans [line items]
Percentage of actuarial method assumption	3.00%
ITAU UNIBANCO HOLDING [Member]
Disclosure of defined benefit plans [line items]
Defined benefit plan assets	R$ 11	11
ITAU UNIBANCO HOLDING [Member] | Real Estate [Member]
Disclosure of defined benefit plans [line items]
Defined benefit plan assets	R$ 445	R$ 487

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- 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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- Definition

The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2019-01-01
-Paragraph 145
-Subparagraph a
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-URIDate 2019-03-27

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- Definition

The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2019-01-01
-Paragraph 57
-Subparagraph a
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-URIDate 2019-03-27

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