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Cover Page
 12 Months Ended
Dec. 31, 2019
shares
Cover [Abstract]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2019
Document Fiscal Year Focus 2019
Document Fiscal Period Focus FY
Trading Symbol ITUB
Entity Registrant Name Itau Unibanco Holding S.A.
Entity Central Index Key 0001132597
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer Yes
Entity Current Reporting Status Yes
Entity Filer Category Large Accelerated Filer
Title of 12(b) Security American Depositary Shares (as evidenced by American Depositary Receipts), each representing one Preferred Share
Security Exchange Name NASDAQ
Document Annual Report true
Document Transition Report false
Entity File Number 001-15276
Entity Shell Company false
Entity Address, Address Line One Praça Alfredo Egydio de Souza Aranha,
Entity Address, City or Town SP
Entity Address, Country BR
Entity Address, Postal Zip Code 04344
Entity Emerging Growth Company false
Entity Voluntary Filers No
Entity Interactive Data Current Yes
Entity Common Stock, Shares Outstanding 4,958,290,359
Document Shell Company Report false
Document Registration Statement false