XML 63 R195.htm IDEA: XBRL DOCUMENT
v3.20.1

Segment Information - Summary of Result of Non-Current Assets and Main Services and Products by Geographic Region (Parenthetical) (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2019
Disclosure of geographical areas [abstract] |
Maximum revenue percentage represented by clients | 10.00%

X
- References No definition available. + Details
Name: | ifrs-full_DisclosureOfGeographicalAreasAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum revenue percentage represented by clients + References No definition available. + Details
Name: | itub_MaximumRevenuePercentageRepresentedByClients
Namespace Prefix: | itub_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration