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Preferred Shares Of Own Issue Credit operations and financial guarantees Fees For Guarantees Issued And Credit Lines Fees For Guarantees Issued And Credit Lines Number of phases of purchase agreement Share Purchase Agreement, Number Of Phases Share Purchase Agreement, Number Of Phases Payments from changes in ownership interests in subsidiaries that do not result in loss of control Payments from changes in ownership interests in subsidiaries that do not result in loss of control Interest on capital, WHT Interest On Capital, WHT Interest On Capital, WHT Institutional market funds Institutional market funds Debt instruments issued Scenario II Scenario Two [Member] Scenario Two [Member] Disclosure of detailed information about financial instruments [table] Disclosure of detailed information about financial instruments [table] Schedule of Operating Segments Schedule Of Operating Segments [Table Text Block] Schedule Of Operating Segments Percentage of social contribution on net profits 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current IncomeTaxAndSocialContributionCurrentLiabilities IncomeTaxAndSocialContributionCurrentLiabilities Market Risk [Axis] Market Risk [Axis] Market Risk [Axis] Interest On Capital Credited Interest On Capital Credited [Member] Interest On Capital Credited [Member] Lease operations - Lessee Disclosure of leases [text block] 9 - Benefits paid Benefits paid or payable Foreign Loans In Latin America Foreign Loans In Latin America [Member] Foreign Loans In Latin America Debentures Debentures Debentures [member] Debentures. Financial guarantee amount Financial Guarantee Amount Financial Guarantee Amount Adjustment of deposits in guarantee and provisions Adjustment Of Escrow Deposits And Provisions [Member] Adjustment Of Escrow Deposits And Provisions [Member] Dibens Leasing S.A. - Arrendamento Mercantil Dibens Leasing S.A. - Arrendamento Mercantil [Member] Dibens Leasing S.A. - Arrendamento Mercantil. Fixed Assets Fixed Assets [Abstract] Fixed Assets Credit Risk [Domain] Credit Risk [Domain] Credit Risk Statement of cash flows [abstract] Statement of cash flows [abstract] Other comprehensive income of non-controlling interests Other comprehensive income, attributable to non-controlling interests Type of measurement of expected credit losses [axis] Type of measurement of expected credit losses [axis] Derivatives Derivative Financial Liabilities At Fair Value Through Profit Or Loss Derivative Financial Liabilities At Fair Value Through Profit Or Loss Increase / (reversal) for the period Adjustments for current tax of prior periods Real estate Real Estate 1 [Member] Real Estate 1 [Member] Other derivatives Other Derivatives [Member] Other Derivatives [Member] Fixed assets Fixed Assets [Text Block] Fixed Assets Disclosure of provision matrix [table] Disclosure of provision matrix [table] Schedule Of Composition Of Derivatives By Index Schedule of composition of derivatives by index [Table Text Block] Schedule of composition of derivatives by index Own credit risk Other comprehensive income, before tax, change in fair value of financial liability attributable to change in credit risk of liability Hedge of loan operations Hedge Of Loan Operations [Member] Hedge Of Loan Operations [Member] Adjusted weighted average of shares Common, Preferred (in shares) Preferred Preferred Income from interest and foreign exchange variation of financial assets at fair value through other comprehensive income InterestRevenueAndForeignExchangeIncomeForFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome InterestRevenueAndForeignExchangeIncomeForFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome Commodities, Indexes and Shares Commodities Indexes And Shares [Member] Commodities Indexes And Shares [Member] Economic, financial and brokerage advisory Brokerage Commission Brokerage Commission 4.35% Four Point Three Five Percentage [Member] Four Point Three Five Percentage [Member] After 2 years After 2 Years After 2 Years Payments and collections Collection Commissions Collection Commissions Other current financial liabilities Other current financial liabilities Foreign currency conversion reserve Foreign currency conversion reserve Foreign currency conversion reserve Financial assets at fair value through profit or loss Financial assets available-for-sale, category [member] Tax effect Income tax relating to cash flow hedges included in other comprehensive income Investments in associates and joint ventures Investments In Associates And Joint Ventures Investments In Associates And Joint Ventures Bonus share issuance ratio Bonus Share Issuance Ratio Bonus Share Issuance Ratio Total Funding From Customers Funding From Customers Contractual service margin Contractual service margin Derivatives - assets, Total gains or losses (realized / unrealized), Income Total Gains Or Losses (Realized / Unrealized), Recognized In The Result Total Gains Or Losses (Realized / Unrealized), Recognized In The Result Vehicles Vehicles Loans [Member] Vehicles Loans [Member] Non-current fair value Non-current financial assets at fair value through other comprehensive income Promissory and commercial notes Promissory Notes [Member] Promissory Notes [Member] Asset ceiling Effect of asset ceiling [member] Expected Credit Losses For Financial Guarantees, Credit Commitments and Credits to Be Released Expected Credit Losses For Financial Guarantees, Credit Commitments and Credits to Be Released [Member] Expected Credit Losses For Financial Guarantees, Credit Commitments and Credits to Be Released Document Shell Company Report Document Shell Company Report Employees’ profit sharing and share-based payment Employee Profit Sharing Employee Profit Sharing (-) Provision for expected credit loss Beginning balance Ending balance Commitments Released Commitments Released Disclosure of other provisions [line items] Disclosure of other provisions [line items] Equity Net of Tax Percentage Equity Net Of Tax, Percentage [Member] Equity Net Of Tax, Percentage Other assets Other Asset Other Asset Schedule of Calculation of Tax Rates Schedule Of Calculation For Tax Rates [Table Text Block] Schedule Of Calculation For Tax Rates Net amount receivables from reimbursement of provisions Net Amount Receivable From Reimbursement Of Provisions [Member] Net Amount Receivable From Reimbursement Of Provisions [Member] Non-current Non-current provisions Nominal discount rate Actuarial assumption of discount rates Operations Operations [Abstract] Operations Securities Securities On Reverse Repurchase Agreements And Cash Collateral On Securities Borrowed Securities On Reverse Repurchase Agreements And Cash Collateral On Securities Borrowed Itaú Unibanco S.A. Itau Unibanco SA [Member] Itau Unibanco SA [Member] 5 years Five Year [Member] Five Year [Member] Unclaimed dividends and Interest on capital Unclaimed dividends and Interest on capital Unclaimed dividends and Interest on capital Luizacred S.A. Soc. Cred. 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Gestora De Inteligencia De Credito S A [Member] Gestora De Inteligencia De Credito S A [Member] Result of delivery of treasury shares Sale or issue of treasury shares Financial liabilities at fair value through profit or loss Financial Liabilities At Fair Values Through Profit Or Loss Financial Liabilities At Fair Values Through Profit Or Loss Classes of financial instruments [axis] Classes of financial instruments [axis] Social contribution on net income Social Contribution On Net Income Social Contribution On Net Income Dividends, Gross value per share (in brl per share) Dividends, Gross Value Per Share Dividends, Gross Value Per Share Fair value adjustment Fair value adjustments (in stockholders' equity) Fair value adjustments (in stockholders' equity) Retirement plan - FUNBEP Pension plan - FUNBEP Funbep Fundo De Pensao Multipatrocinado [Member] Funbep Fundo De Pensao Multipatrocinado [Member] 2024 Two Thousand And Twenty Four [Member] Two Thousand And Twenty Four Expense from share-based payment transactions with employees Expense from share-based payment transactions with employees Schedule of Reconciliation of Private Pension One Schedule of Reconciliation Of Private Pension One [Table Text Block] Schedule of Reconciliation Of Private Pension One Total Total One [Member] Total One [Member] Classes of financial assets [axis] Classes of financial assets [axis] Total financial liability Gross lease liabilities Increase capital (in shares) Increase In Capital, Shares Increase In Capital, Shares Amount reclassified from cash flow hedge reserve to income Amount reclassified from foreign currency conversion reserve into income Reclassification adjustments on cash flow hedges, net of tax Land Land [member] Classes of assets [axis] Classes of assets [axis] From 4 to 5 years 2030 Later than four years and not later than five years [member] Income tax and social contribution expenses Current Income Tax And Social Contribution Expense Benefit Current Income Tax And Social Contribution Expense Benefit Disclosure of actual claims compared with previous estimates [table] Disclosure of actual claims compared with previous estimates [table] Guaranteed real estate bills Guaranteed Real State Notes [Member] Guaranteed Real State Notes [Member] Range [axis] Range [axis] Other financial assets Other Financial Asset [Member] Other Financial Asset [Member] Stock exchange Stock exchange [Member] Stock exchange Schedule of Sensitivity Analyses Operations Schedule Of Sensitivity Analyses Operations [Table Text Block] Schedule Of Sensitivity Analyses Operations Interest on capital, Gross value per share (in brl per share) Interests On Capital, Gross Value Per Share Interests On Capital, Gross Value Per Share Income from sale of investments and fixed assets Adjustments For Gain Loss On Sale Of Investments And Fixed Assets Adjustments For Gain Loss On Sale Of Investments And Fixed Assets (Purchase) / Funds from the sale of financial assets at fair value through other comprehensive income Cash flows from losing control of subsidiaries or other businesses, classified as investing activities Capital reserves Capital reserve Selling - credit cards Selling expense Itaú Colombia S.A. Itau Colombia S A [Member] Itau Colombia S A [Member] Other Other Banking Services Other Banking Services Abroad All Other Countries Securities [Member] All Other Countries Securities Individuals Individuals [Member] Individuals [Member] Other non-financial assets Other non-financial assets [Policy Text Block] Other non-financial assets Stockholders’ equity Disclosure of share capital, reserves and other equity interest [text block] lnsurance Total Insurance Contracts And Private Pension Insurance Total Insurance Contracts And Private Pension Insurance Futures Futures contract [member] Disclosure of other provisions [table] Disclosure of other provisions [table] lnsurance Simplified Model Paa Insurance Simplified Model Paa Insurance Estimated expected credit loss write-off period Estimated Expected Credit Loss Write-Off Period Estimated Expected Credit Loss Write-Off Period Dividends / Interest on capital - declared after previous period Dividends / Interest on capital - declared after previous period Dividends / Interest on capital - declared after previous period Classes of financial instruments [domain] Classes of financial instruments [domain] Disclosure of detailed information about business combination [table] Disclosure of detailed information about business combination [table] Legal Legal [Member] Legal [Member] Interest received Interest received, classified as operating activities Insurance contracts [domain] Insurance contracts [domain] 31-180 days Later than one month and not later than six months [member] Perpetual Perpetual [Member] Perpetual [Member] Hedge of assets denominated in Chilean unit of account Hedge Of Assets Denominated In Chilean Unit Of Account [Member] Hedge Of Assets Denominated In Chilean Unit Of Account Payment of income tax and social contribution Payment of income tax and social contribution Payment of income tax and social contribution Revenue from rendering of services Revenue from rendering of services Raising of subordinated debt obligations Subordinated debt obligations raisings Subordinated debt obligations raisings Partner plan Partners Plan [Member] Partners Plan [Member] 4.75% Four Point Seven Five Percentage [Member] Four Point Seven Five Percentage [Member] Itaú Corretora de Valores S.A. Itau Corretora de Valores S.A. [Member] Itau Corretora de Valores S.A. Net deferred taxes, percentage Net Deferred Taxes, Percentage Net Deferred Taxes, Percentage Schedule of Realization and Present Value of Tax Credits and From Provision for Deferred Income Tax and Social Contribution Disclosure of temporary difference, unused tax losses and unused tax credits [text block] Schedule of Level 3 Recurring Fair Value Changes Schedule Of Level 3 Recurring Fair Value Changes [Table Text Block] Schedule Of Level 3 Recurring Fair Value Changes Disclosure of detailed information about intangible assets [table] Disclosure of detailed information about intangible assets [table] Other financial liabilities Adjustment For Increase Decrease In Other Financial Liability Adjustment For Increase Decrease In Other Financial Liability 7.18% Seven Point One Eight Percentage [Member] Seven Point One Eight Percentage [Member] Loan Commitments Loan commitments [member] Dividends / Interest on capital received from investments in associates and joint ventures Dividends / Interest on capital received from investments in associates and joint ventures Dividends / Interest on capital received from investments in associates and joint ventures Hipercard Banco Múltiplo S.A. Hipercard Banco Multiplo S.A. [Member] Hipercard Banco Multiplo S.A. Other financial liabilities Other Financials Liabilities [Member] Other Financials Liabilities [Member] Impairment Impairment loss recognised in profit or loss, property, plant and equipment Eurobonds and other Eurobonds And Others [Member] Eurobonds And Others [Member] Increase (decrease) in goodwill Increase (decrease) in goodwill Net cash from / (used in) financing activities Cash flows from (used in) financing activities Stage 1 Stages One [Member] Stages One [Member] Counterparties [axis] Counterparties [axis] Preferred Preference shares [member] Restricted Investment Without Co-Obligation Restricted Investment Without Co-Obligation [Member] Restricted Investment Without Co-Obligation Fair value Plan assets, at fair value Plan assets, at fair value Treasury shares Treasury shares Financial assets designated at fair value through profit or loss Financial Assets Designated At Fair Value Through Profit Or Loss Equity Securities [Member] Financial Assets Designated At Fair Value Through Profit Or Loss Equity Securities [Member] Non-financial assets Non Financial Assets At Fair Value Non Financial Assets At Fair Value Interest on capital, Net Interest On Capital Net Interest On Capital Net 4.45% Four Point Four Five Percentage [Member] Four Point Four Five Percentage [Member] Association for the promotion and offer of financial products and services Promotion And Offer Of Financial Products And Service [Member] Promotion And Offer Of Financial Products And Service [Member] Statement of changes in equity [table] Statement of changes in equity [table] Actuarial assumptions [axis] Actuarial assumptions [axis] Loan and lease operations Loan and lease operations Loan Operations And Lease Operations Portfolio Loan Operations And Lease Operations Portfolio Total Civil Labor And Other Provisions [Member] Civil Labor And Other Provisions [Member] Bank G-SIB and/or D-SIB additional requirements (%) Bank G-SIB And/Or D-SIB Additional Requirements (%) Bank G-SIB And/Or D-SIB Additional Requirements (%) Total gains or Losses (unrealized) Total Unrealized Gains (Losses) On Financial Assets, Fair Value Total Unrealized Gains (Losses) On Financial Assets, Fair Value 2028 Two Thousand And Twenty Eight [Member] Two Thousand And Twenty Eight [Member] Options Currency Options Contract [Member] Currency Options Contract [Member] Classes of assets [domain] Classes of assets [domain] Capital compensation Capital compensation [Policy Text Block] Capital compensation (Purchase) / Redemptions of financial assets at amortized cost Proceeds from sales of property, plant and equipment, classified as investing activities Schedule of Non-Material Individual Investments Schedule Of Main Investments [Table Text Block] Schedule Of Main Investments Transfer from Stage 2 Transfer from Stage 2 Transfer from Stage 2 Types of hedges [domain] Types of hedges [domain] Schedule of Off Balance Commitments Schedule Of Off Balance Commitments [Table Text Block] Schedule Of Off Balance Commitments Tax effect Tax effect Tax effect Totaled average sovereign securities Totaled Average Sovereign Securities Totaled Average Sovereign Securities Minimum Bottom of range [member] Lease expenses for low value assets Expense relating to leases of low-value assets for which recognition exemption has been used Schedule of Collateral for Loans and Financial Lease Operations Schedule Of Collateral For Loans And Financial Lease Operations [Table Text Block] Schedule Of Collateral For Loans And Financial Lease Operations Other financial assets Others Financial Assets Others Financial Assets Basis of preparation Basis of preparation [Policy Text Block] Basis of preparation Categories of related parties [axis] Categories of related parties [axis] Impairment of non-financial assets Description of accounting policy for impairment of non-financial assets [text block] Loan and lease operations Loan operations Loan operations Net income / (loss) Net income / (loss) Net income Profit (loss) Time deposits Time deposit Time Deposits [Member] Time Deposits [Member] Income from share in the net income of associates and joint ventures and other investments Adjustments for undistributed profits of associates Cancelled Cancelled Cancelled ITB Holding Brasil Participações Ltda. ITB Holding Brasil Participações Ltda. [Member] ITB Holding Brasil Participações Ltda. Maximum revenue percentage represented by clients Maximum Revenue Percentage Represented By Clients Maximum Revenue Percentage Represented By Clients Derivatives Derivatives Held Trading Of Financial Assets At Fair Value Through Profit Or Loss Designated Recognition Derivatives Held Trading Of Financial Assets At Fair Value Through Profit Or Loss Designated Recognition Assets pledged as collateral Assets Pledged As Collateral [Member] Assets Pledged As Collateral [Member] Claims rates, decrease Claims Rates, Decrease Claims Rates, Decrease Document Registration Statement Document Registration Statement Settlements Settlements, Fair Value Measurement, Financial Assets, Other Comprehensive Income Settlements, Fair Value Measurement, Financial Assets, Other Comprehensive Income Associates Total for all associates [member] Delivered Delivered Delivered Management Members Members of the Audit Committee and the Board of Directors Management Members Members Of The Audit Committee And The Board Of Directors [Member] Management Members Members Of The Audit Committee And The Board Of Directors [Member] Schedule of Securitization or Transfer of Financial Assets Schedule Securitization Or Transfer Of Financial Assets [Table Text Block] Schedule Securitization Or Transfer Of Financial Assets Banco Itaú (Suisse) S.A. Banco Itau (Suisse) SA [Member] Banco Itau (Suisse) SA. Non-current Non-current debt instruments issued Investment Investment income Actuarial liabilities Present value of defined benefit obligation [member] Lease operations (Lessee) Description of accounting policy for leases [text block] Treasury shares, beginning balance Treasury shares, ending balance Treasury Share Treasury Share Deposits Adjustment For Increase Decrease In Deposit Adjustment For Increase Decrease In Deposit Disclosure of provision matrix [line items] Disclosure of provision matrix [line items] Business Contact Business Contact [Member] Schedule of Change in Share-Based Variable Compensation Schedule of Change in Share-Based Variable Compensation [Table Text Block] Schedule of Change in Share-Based Variable Compensation Liabilities Liabilities [abstract] Promissory and commercial notes Promissory And Commercial Notes [Member] Promissory And Commercial Notes [Member] Counterparty credit risk (CCR) Counterparty Credit Risk [Member] Counterparty Credit Risk [Member] Current Current financial assets at fair value through profit or loss, classified as held for trading Carrying amount [member] Carrying amount [member] Biometric tables, decrease Biometric Tables, Decrease Biometric Tables, Decrease Liabilities Book value, liabilities Hedged item, liabilities Interbank Interbank Deposits [Member] Interbank Deposits [Member] Supplementary Information Supplementary Information [Abstract] Supplementary Information Security Exchange Name Security Exchange Name Result of delivery of treasury shares Proceeds from sale or issue of treasury shares Received risk Notional amount of credit protection sold Notional amount of credit protection sold Disclosure of assets and liabilities with significant risk of material adjustment [line items] Disclosure of assets and liabilities with significant risk of material adjustment [line items] Schedule of Breakdown of Income Tax and Social Contribution Expense Schedule Of Breakdown Of Income Tax And Social Contribution 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[Abstract] Financial Assets At Fair Value Through Profit Or Loss And Designated At Fair Value Through Profit Or Loss - Securities Additional recognition, goodwill Additional recognition, goodwill Schedule of Financial Assets and Liabilities Disclosure Of Detailed Information About Break Down Of Securities Sold Under Repurchase Agreement Explanatory [Table Text Block] Disclosure Of Detailed Information About Break Down Of Securities Sold Under Repurchase Agreement Explanatory Overdue as from 1 day Overdue As From One Day [Member] Overdue As From One Day [Member] Schedule of Result of Non-Current Assets and Main Services and Products by Geographic Region Disclosure of geographical areas [text block] Financial assets and liabilities Financial assets and liabilities [Policy Text Block] Financial assets and liabilities Financial assets Financial assets, beginning value Financial assets, ending value Financial assets, at fair value Deferred shares delivered per year percentage Share-based Compensation Arrangement, Variable Compensation Arrangement, Share Deferral Basis, Percentage Delivered Per Year Share-based Compensation Arrangement, Variable Compensation Arrangement, Share Deferral Basis, Percentage Delivered Per Year Central Bank of Brazil deposits Central Bank of Brazil deposits  Central Bank of Brazil deposits  Interest On Capital Four Interest On Capital Four [Member] Interest On Capital Four [Member] Depreciation and amortization Other Administrative Expenses Other Administrative Expenses Other financial liabilities Others Financial Liabilities [Member] Others Financial Liabilities [Member] Brazilian government Brazilian Government [Member] Brazilian Government [Member] Brazil Country Of Brazil [Member] Country Of Brazil [Member] High Higher Risk [Member] Higher Risk [Member] 2032 Two Thousand And Thirty Two [Member] Two Thousand And Thirty Two [Member] Dividends and interest on capital declared and not yet paid Dividends and interest on capital declared and not yet paid Dividends and interest on capital declared and not yet paid Financial assets at amortised cost, class Financial assets at amortised cost, class [member] Schedule of Reconciliation of Private Pension Schedule Of Reconciliation Of Private Pension [Table Text Block] Schedule Of Reconciliation Of Private Pension Variable expenses not included in lease liabilities Expense relating to variable lease payments not included in measurement of lease liabilities CDI + 2.4% Cdi Plus Two Point Four Percentage [Member] Cdi Plus Two Point Four Percentage [Member] Change in accounting estimate generated impact Change In Accounting Estimate Generated Impact Change In Accounting Estimate Generated Impact Other Other Subsidiaries [Member] Other Subsidiaries [Member] Deferred income Deferred Income [Member] Deferred Income [Member] Funding expenses Funding Expenses Funding Expenses Entity Addresses, Address Type [Axis] Entity Addresses, Address Type [Axis] Fixed assets, net Property, plant and equipment Paid / prepaid, value Paid / prepaid, value Paid / prepaid, value (Purchase) / Sale of investments in associates and joint ventures Termination of intangible asset agreements Termination of intangible asset agreements Dividends per share (in brl per share) Dividend Per Share Dividend Per Share Plano De Beneficios I I Plano De Beneficios I I [Member] Plano De Beneficios I I [Member] Derivatives (assets / liabilities) Derivatives (assets / liabilities) Derivatives (assets / liabilities) Other liabilities Other current liabilities Other assets Other assets Other non-financial assets Other non-financial assets Level 1 Level 1 of fair value hierarchy [member] New Number of share options granted in share-based payment arrangement Other non-financial liabilities Other non-financial liabilities Labor Labour [Member] Labour [Member] Beginning balance Ending balance AllowanceAccountForExpectedLoanLossesForLoanOperationsAndLeaseOperations AllowanceAccountForExpectedLoanLossesForLoanOperationsAndLeaseOperations Schedule of Tax Liabilities Schedule Of Tax Liabilities [Table Text Block] Schedule Of Tax Liabilities Non-cash transactions Non-cash transactions Non-cash transactions IFRS 17 IFRS 17 [member] Additional income tax Additional Income Tax Additional Income Tax Book value Book Value [Member] Book Value [Member] Cure to Stage 1 Cure to Stage 1 Cure to Stage 1 Variation in fair value used to calculate hedge ineffectiveness Variation in fair value recognized in income Gain (loss) on change in fair value of hedged item used as basis for recognising hedge ineffectiveness Financial liabilities at fair value through profit or loss that meet definition of held for trading Financial liabilities at fair value through profit or loss that meet definition of held for trading 2027 Defined Benefit Plan Expected Future Benefit Payment Year Two Defined Benefit Plan Expected Future Benefit Payment Year Two Securities Financial Assets At Fair Value Through Profit Or Loss [Member] Financial Assets At Fair Value Through Profit Or Loss [Member] Derivatives assets, Transfers in and / or out of Level Transfers Into Level Of Fair Value Hierarchy Derivative Assets Transfers Into Level Of Fair Value Hierarchy Derivative Assets Total Interest And Similar Income Interest And Similar Income Corporate securities Corporates Debt Securities [Member] Corporates Debt Securities [Member] Hedge ineffectiveness recognized in income Hedge ineffectiveness recognized in income Gain (loss) on hedge ineffectiveness recognised in profit or loss Individual assets or cash-generating units [axis] Individual assets or cash-generating units [axis] Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption Other financial assets at fair value through profit or loss Other Financial Assets At Fair Value Through Profit Or Loss Other Financial Assets At Fair Value Through Profit Or Loss Securities purchased under agreements to resell Adjustments For Securities Purchased Under Agreements To Resell Adjustments For Securities Purchased Under Agreements To Resell Income tax and social contribution - current Income tax and social contribution - current Income tax and social contribution - current Credit Risk [Axis] Credit Risk [Axis] Credit Risk [Axis] Supplementary Information [Table] Supplementary Information [Table] Supplementary Information Disclosure of temporary difference, unused tax losses and unused tax credits [line items] Disclosure of temporary difference, unused tax losses and unused tax credits [line items] lnterbank And lnterbranch Accounts (Assets And Liabilities) lnterbank And lnterbranch Accounts (Assets And Liabilities) lnterbank And lnterbranch Accounts (Assets And Liabilities) 3.50% to 4.92% Three Point Five Zero Percentage To Four Point Nine Two Percentage [Member] Three Point Five Zero Percentage To Four Point Nine Two Percentage [Member] Statement of changes in equity [abstract] Loan operations and lease operations value Loan operations and lease operations portfolio Loan Operations And Lease Operations Value Loan Operations And Lease Operations Value Measurement [domain] Measurement [domain] Total gains or losses (unrealized) Total Unrealized Gains (Losses) On Financial Assets, Fair Value Through Profit (Loss) Total Unrealized Gains (Losses) On Financial Assets, Fair Value Through Profit (Loss) Gross financial assets subject to offsetting, enforceable master netting arrangements or similar agreements Gross financial assets subject to offsetting, enforceable master netting arrangements or similar agreements Total Off Balance Sheet Item Off Balance Sheet Item CDI + 1.9% Cdi Plus One Point Nine Percentage [Member] Cdi Plus One Point Nine Percentage [Member] Commodities Commodities [Member] Commodities Inflation rate Inflation Rate Inflation Rate Fair value, assets Accumulated fair value hedge adjustment on hedged item included in carrying amount, assets Types of risks [domain] Types of risks [domain] Percentage of voting equity interests acquires Percentage Of Voting Equity Interests Acquires Percentage Of Voting Equity Interests Acquires Foreign securities Foreign Securities [Member] Foreign Securities [Member] Subsidiaries [axis] Subsidiaries [axis] Interest paid Interest paid, classified as operating activities Fair value Total Total Financial assets at fair value through profit or loss, classified as held for trading Change in non-controlling interests stockholders Change in non-controlling interests stockholders Change in non-controlling interests stockholders Other financial assets Adjustments For Other Financial Assets Adjustments For Other Financial Assets Operating revenues Operating Revenues Operating Revenues At the end of event period At The End Of Event Period At The End Of Event Period Net defined benefit liability (asset) [domain] Net defined benefit liability (asset) [domain] Banco Itaú Uruguay S.A. Banco Itau Uruguay S.A. [Member] Banco Itau Uruguay S.A. 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Rias Redbanc S A [Member] Rias Redbanc S A [Member] Minimum mandatory dividend Mandatory Dividend Mandatory Dividend Share-based payment Disclosure of share-based payment arrangements [text block] Current income tax and social contribution Current Income Tax And Social Contribution Current Income Tax And Social Contribution TRS Total Returns Swap [Member] Total Returns Swap [Member] Promissory notes Promissory Note [Member] Promissory Note [Member] 31 – 365 Later than one year [member] Falling due from 3 months to 12 months Falling Due More Than Three Months But Less Than One Year [Member] Falling Due More Than Three Months But Less Than One Year [Member] 12/31/2025 Reporting year [member] Interbank market funds Interbank market funds Interbank market funds Interbank Market Fund Financing Interbank Market Fund Financing Biomas – Serviços Ambientais, Restauração e Carbono S.A. 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[Member] Itau Seguros S.A. Separate management entities [axis] Separate management entities [axis] Loss on sale of other assets, fixed assets and investments in associates and joint ventures Loss On Sale Of Assets Held For Sale Fixed Assets And Investments In Associates And Joint Ventures Loss On Sale Of Assets Held For Sale Fixed Assets And Investments In Associates And Joint Ventures Classes of other provisions [axis] Classes of other provisions [axis] 50 largest debtors Fifty Largest Debtors [Member] Fifty Largest Debtors [Member] Transfers in the hierarchy Transfers In The Hierarchy, Assets At Fair Value Transfers In The Hierarchy, Assets At Fair Value Impact in Stockholders’ Equity, Private Pension Impact In Stockholders Equity Private Pension [Member] Impact In Stockholders Equity Private Pension [Member] Average cost (in brl per share) Average Cost Price Per Share Average Cost Price Per Share Securities at fair value through profit or loss (FVPL) Financial assets at fair value through profit or loss and designated at fair value through profit or loss - Securities [Text Block] Financial assets at fair value through profit or loss and designated at fair value through profit or loss - Securities Collateral repledge Collateral repledge Collateral repledge Equity investments in funds - fall-back approach Equity Investment In Funds Fall Back Approach [Member] Equity Investment In Funds Fall Back Approach [Member] Financial liabilities Liabilities Derivatives Derivatives Derivative financial liabilities Olímpia Promoção e Serviços S.A. Olimpia Promocaoe Servicos S A [Member] Olimpia Promocaoe Servicos S A [Member] Schedule of Allocation of Assets by Category Segmented into Quoted and Not Quoted in Active Market Disclosure of defined benefit plans [text block] Common Ordinary shares [member] Weighted average (in brl per share) Market Value Weighted Average Market Value Weighted Average Transfer to stage 2 Transfer To Lifetime Expected Credit Losses Not Credit Impaired [Member] Transfer To Lifetime Expected Credit Losses Not Credit Impaired Earnings per share Disclosure of earnings per share [text block] Gross carrying amount Cost Gross carrying amount [member] New recognized insurance contracts New Recognized Insurance Contracts New Recognized Insurance Contracts Disclosure of information about credit exposures designated as measured at fair value through profit or loss [line items] Disclosure of information about credit exposures designated as measured at fair value through profit or loss [line items] Other liabilities Adjustments for increase (decrease) in other liabilities Provisions for civil lawsuits, labor and tax claims and social security lawsuits and other risks Adjustments for finance costs Financial Financial [Member] Financial [Member] Changes in demographic assumptions Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) in changes in demographic assumptions Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) in changes in demographic assumptions Up to one year Up to 1 year 2026 Not later than one year [member] Paid / prepaid Paid / prepaid Paid / prepaid Schedule of Compensation and Benefits of Key Management Personnel Disclosure of amounts incurred by entity for provision of key management personnel services provided by separate management entities [text block] Retained earnings to be distributed to common equity owners in an amount per share equal to the minimum dividend payable to preferred equity owners Retained earnings To Be Distributed To Common Shares Retained earnings To Be Distributed To Common Shares Commissions and Banking Fees Fee and commission income L C R L C R [Member] L C R [Member] Financial liabilities at fair value through profit or loss Financial liabilities at fair value through profit or loss, category [member] Total assets Total Assets [Member] Total Assets [Member] Securities sold under repurchase agreements Deposits received under securities repurchase agreements Deposits received under securities repurchase agreements Net financial assets subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position Net financial assets subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position Disclosure of financial assets [line items] Disclosure of financial assets [line items] Provision for taxes other than income tax Provision for taxes other than income tax [member] Fixed assets Description of accounting policy for property, plant and equipment [text block] Market Risk Market risk [member] Surety Surety Surety Business development Disclosure of business combinations [text block] Entity Sector Industry Classifications Sectors [Axis] Entity Sector Industry Classifications Sectors [Axis] Entity Sector Industry Classifications Sectors [Axis] Disclosure of risk management strategy related to hedge accounting [table] Disclosure of risk management strategy related to hedge accounting [table] Weighted average number of outstanding shares - 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Itaú de Capitalização Cia. Itau de Capitalizacao [Member] Cia. Ita ude Capitalizacao. Financial Income from Insurance Contracts and Private Pension, net of Reinsurance Financial Income from Insurance Contracts and Private Pension, net of Reinsurance Financial Income from Insurance Contracts and Private Pension, net of Reinsurance Individuals Individuals One [Member] Individuals One [Member] Restricted operations on assets Restricted Operations On Assets [Member] Restricted Operations On Assets Schedule of Consolidated Companies Schedule of consolidated companies [Table Text Block] Schedule of consolidated companies Maximum potential of future payments, gross Maximum potential amount of future payments Maximum potential amount of future payments Disclosure of temporary difference, unused tax losses and unused tax credits [table] Disclosure of temporary difference, unused tax losses and unused tax credits [table] Variation in fair value used to calculate hedge ineffectiveness Variation in fair value used to calculate hedge ineffectiveness Variation in fair value used to 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Crédito, Financiamento e Investimento Financeira Itau CBD S.A. Credito, Financiamento e Investimento [Member] Financeira Itau CBD S.A. Credito, Financiamento e Investimento. 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Disclosure of financial assets that are either past due or impaired [table] Disclosure of financial assets that are either past due or impaired [table] Securities at fair value through other comprehensive income (FVOCI) Financial assets at fair value through other comprehensive income - Securities [Text Block] Financial assets at fair value through other comprehensive income - Securities Geographical areas [axis] Geographical areas [axis] Claims rates, increase Claims Rates, Increase Claims Rates, Increase Current Interbank Market Fund Financing, Current Interbank Market Fund Financing, Current Cure to Stage 1 Cure To 12-month Expected Credit Losses [Member] Cure To 12-month Expected Credit Losses Financial liabilities Financial Liabilities [Member] Financial Liabilities Hedge of firm commitments Hedge Of Firm Commitments [Member] Hedge Of Firm Commitments [Member] Results from foreign exchange operation Adjustments For Foreign Exchange Gains Losses Adjustments For Foreign Exchange Gains Losses Amount recognized in stockholders' equity - 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Banco Itau Paraguay S.A. [Member] Banco Itau Paraguay S.A. 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Risk And Capital Management Risk And Capital Management [Abstract] Risk And Capital Management CDI + 0.2% Cdi Plus Point Zero Two Percentage [Member] Cdi Plus Point Zero Two Percentage Fair value hedge Hedge Of Securities [Member] Hedge Of Securities [Member] Country Region Country Region Disclosure of offsetting of financial assets [line items] Disclosure of offsetting of financial assets [line items] Cash outflow for leases Cash outflow for leases Currency in which information is displayed [axis] Currency in which information is displayed [axis] Corporate reorganization Corporate reorganization Corporate reorganization CDS Credit Default Swaps [Member] Credit Default Swaps [Member] Profit reserves Profit reserves Profit reserves Interest On Capital Three Interest On Capital Three [Member] Interest On Capital Three [Member] Over 720 days Later Than Two Years [Member] Later Than Two Years [Member] Comprehensive income attributable to the owners of the parent company Comprehensive income, attributable to owners of parent Percentage of VaR of total stockholders' equity Percentage Of VaR Total Stockholders' Equity Percentage Of VaR Total Stockholders' Equity Financial assets pledged as collateral for liabilities or contingent liabilities Financial assets pledged as collateral for liabilities or contingent liabilities 2029 Defined Benefit Plan Expected Future Benefit Payment Year Four Defined Benefit Plan Expected Future Benefit Payment Year Four Claims losses Claims [Default Label] Claims [Default Label] Total liabilities Liabilities Total liabilities Liabilities Actuarial assumption of medical cost trend rates Actuarial assumption of medical cost trend rates Derivatives liability, Total gains or losses (unrealized) Derivatives Liability, Total Gains Or Losses (Unrealized) Derivatives Liability, Total Gains Or Losses (Unrealized) Revenue from update / charges on deposits in guarantee Revenue from update / charges on deposits in guarantee Revenue from update / charges on deposits in guarantee Financial Assets Financial Asset At Amortized Costs Financial Asset At Amortized Costs Obligations on official agreements and rendering of payment services Liabilities For Official Agreements And Rendering Of Payment Services [Member] Liabilities For Official Agreements And Rendering Of Payment Services [Member] PIS and COFINS Pis And Cofins [Member] Pis And Cofins [Member] Taxes Taxes [Abstract] Taxes Schedule of Internal Rating Schedule Of Internal Rating [Table Text Block] Schedule Of Internal Rating Taxation of results abroad – capital gains Taxation Of Results Abroad Capital Gains [Member] Taxation Of Results Abroad Capital Gains [Member] Disclosure of contingent liabilities in business combination [table] Disclosure of contingent liabilities in business combination [table] Total Interbank Deposits And Securities Purchased Under Agreements To Resell Interbank Deposits And Securities Purchased Under Agreements To Resell Legal reserve Legal reserve Legal reserve Non-current Current tax liabilities, current Consortia Asset Management Fees Consortia Income Asset Management Fees Consortia Income Disclosure of detailed information about hedges [table] Disclosure of detailed information about hedges [table] Insurance contracts and private pension Disclosure Of Insurance Contracts And Private Pension Explanatory [Text Block] Disclosure Of Insurance Contracts And Private Pension Explanatory Savings Saving Deposits [Member] Saving Deposits [Member] Profit reserves Revenue Reserves Revenue Reserves (-) Cancellation of Shares - 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