XML 157 R164.htm IDEA: XBRL DOCUMENT v3.20.1

Earnings Per Share - Additional Information (Detail) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings per share [abstract]
Potential anti-dilutive preferred shares excluded from calculation of diluted earnings	0	0	538,312

X

- References

No definition available.

+ Details

Name:	ifrs-full_EarningsPerShareAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Potential anti-dilutive preferred shares excluded from calculation of diluted earnings

+ References

No definition available.

+ Details

Name:	itub_PotentialAntidilutivePreferredSharesExcludedFromCalculationOfDilutedEarnings
Namespace Prefix:	itub_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration