Label

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iShares LifePath Target Date 2040 ETF

Risk/Return:

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Risk/Return [Heading]

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iShares LifePath Target Date 2040 ETF Ticker: ITDDStock Exchange: NYSE Arca

Objective [Heading]

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Investment Objective

Objective, Primary [Text Block]

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The iShares LifePath Target Date 2040 ETF (the “2040 Fund” or the “Fund”) seeks to provide retirement outcomes through exposure to a broad portfolio of ETFs which adjusts its allocation as it approaches its target date.

Expense [Heading]

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Fees and Expenses

Expense Narrative [Text Block]

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The following table describes the fees and expenses that you will incur if you buy, hold and sell shares of the Fund. The investment advisory agreement between iShares Trust (the “Trust”) and BlackRock Fund Advisors (“BFA”) (the “Investment Advisory Agreement”) provides that BFA will pay all operating expenses of the Fund, except: (i) the management fees, (ii) interest expenses, (iii) taxes, (iv) expenses incurred with respect to the acquisition and disposition of portfolio securities and the execution of portfolio transactions, including brokerage commissions, (v) distribution fees or expenses, and (vi) litigation expenses and any extraordinary expenses. The Fund may incur “Acquired Fund Fees and Expenses.” Acquired Fund Fees and Expenses reflect the Fund’s pro rata share of the fees and expenses incurred indirectly by the Fund as a result of investing in other investment companies. The impact of Acquired Fund Fees and Expenses is included in the total returns of the Fund. Acquired Fund Fees and Expenses are not included in the calculation of the ratio of expenses to average net assets shown in the Financial Highlights section of the Fund’s prospectus (the “Prospectus”).

You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.

Operating Expenses Caption [Text]

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Annual Fund Operating Expenses(ongoing expenses that you pay each year as apercentage of the value of your investments)1

Portfolio Turnover [Heading]

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Portfolio Turnover.

Portfolio Turnover [Text Block]

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The Fund and the iShares funds in which the Fund invests (each, an “Underlying Fund” and collectively, the “Underlying Funds”), may pay transaction costs, such as commissions, when they buy and sell securities (or “turn over” their portfolio). A higher portfolio turnover rate for the Fund or Underlying Funds may indicate higher transaction costs and may cause the Fund or Underlying Funds to incur increased expenses. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example (except costs to Underlying Funds included as part of Acquired Fund Fees and Expenses), affect the Fund's performance. Because the Fund is new, there is no reportable turnover.

Acquired Fund Fees and Expenses, Based on Estimates [Text]

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As the Fund has not commenced operations prior to the date of the Fund's Prospectus, Acquired Fund Fees and Expenses are based on an estimate of the Fund's allocation to other investment companies for the current fiscal year.

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

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Acquired Fund Fees and Expenses are not included in the calculation of the ratio of expenses to average net assets shown in the Financial Highlights section of the Fund’s prospectus (the “Prospectus”).

Expense Example [Heading]

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Example.

Expense Example Narrative [Text Block]

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This Example is intended to help you compare the cost of owning shares of the Fund with the cost of investing in other funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then sell all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Strategy [Heading]

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Principal Investment Strategies

Strategy Narrative [Text Block]

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The 2040 Fund is actively managed and allocates and reallocates its assets among a combination of Underlying Funds in proportions based on its own investment strategy.

The 2040 Fund is one of a group of funds referred to as the “LifePath ETFs,” each of which seeks to provide for retirement outcomes based on quantitatively measured risk that investors on average may be willing to accept given a particular time horizon.

BFA employs a multi-dimensional approach to assess risk for the 2040 Fund and to determine its allocation across asset classes. As part of this multi-dimensional approach, BFA aims to quantify risk using proprietary risk measurement tools that, among other things, analyze historical and forward-looking securities market data, including risk, asset class correlations, and expected returns. Under normal circumstances, the 2040 Fund intends to invest primarily in affiliated exchange-traded funds (“ETFs”).

The 2040 Fund will invest, under normal circumstances, at least 80% of its assets in securities or other financial instruments that are components of or have economic characteristics similar to the securities included in its custom model benchmark, the 2040 Target Date Custom Benchmark. BFA will not publish its custom benchmark but will apply a proprietary model to monitor performance of the 2040 Fund. The 2040 Fund is designed for investors expecting to retire or to begin withdrawing assets around the year 2040. At inception, BFA expects the 2040 Fund to hold approximately 79.30% of its assets in Underlying Funds that seek to track particular underlying indexes of equity securities, approximately 20.70% of its assets in Underlying Funds that seek to track particular fixed-income indexes and the remainder of its assets in Underlying Funds that invest primarily in money market instruments.

At inception, the Fund invests in the iShares 0-5 Year TIPS Bond ETF, iShares 1-5 Year Investment Grade Corporate Bond ETF, iShares 5-10 Year Investment Grade Corporate Bond ETF, iShares 10+ Year Investment Grade Corporate Bond ETF, iShares 10-20 Year Treasury Bond ETF, iShares Core MSCI Emerging Markets ETF, iShares Core MSCI International Developed Markets ETF, iShares Core U.S. REIT ETF, iShares Global Infrastructure ETF, iShares MBS ETF, iShares Russell 1000 ETF, iShares Russell 2000 ETF, iShares U.S. Treasury Bond ETF and money market funds advised by BFA or its affiliates (“BlackRock Cash Funds”). Factors such as fund classifications, historical risk and performance, and the relationship to other Underlying Funds in the Fund are considered when selecting Underlying Funds. The specific Underlying Funds selected for the Fund are determined at BFA’s discretion and may change as deemed appropriate to allow the Fund to meet its investment objective. See the “Information About the Underlying Funds” section of the prospectus for a list of the Underlying Funds, their classification into equity, fixed-income or money market funds and a brief description of their investment objectives and primary investment strategies.

Under normal circumstances, the Fund’s asset allocation will change over time according to a predetermined “glide path” as the Fund approaches its target date. The glide path below represents the shifting of asset classes over time. As the glide path shows, as time elapses prior to retirement, the Fund’s asset allocations become more conservative. This reflects the need for reduced investment risk as retirement approaches and the need for lower volatility of the Fund, which for certain investors may be a primary source of income after retirement. During the year prior to the Fund’s maturity date, its allocation of assets is expected to be similar to that of the Retirement Fund. Further, as retirement approaches, such Fund and the Retirement Fund is expected to, subject to approval by the Trust’s Board of Trustees (the “Board”), merge into a single fund.

The following chart illustrates the glide path — the target allocation among asset classes as the LifePath ETFs approach their target dates:

 

The following table lists the target allocation by years until retirement: 

Years to Retirement	Equity Allocation (including REITs)	Fixed-Income Allocation
45	99%	1%
40	99%	1%
35	99%	1%
30	98%	2%
25	95%	5%
20	87%	13%
15	77%	23%
10	65%	35%
5	53%	47%
0	40%	60%

The asset allocation targets are established by the Fund’s portfolio managers. The investment team, including the portfolio managers, meets regularly to assess market conditions, review the asset allocation targets of the Fund, and determine whether any changes are required to enable the Fund to achieve its investment objective.

Although the asset allocation targets listed for the glide path are general, long-term targets, BFA may periodically adjust the proportion of equity and fixed-income Underlying Funds in the Fund, based on an assessment of the current market conditions, the potential contribution of each asset class to the expected risk and return characteristics of the Fund, reallocations of the Fund’s composition to reflect intra-year movement along the glide path and other factors. In general, such adjustments will be limited; however, BFA may determine that a greater degree of variation is warranted to protect the Fund or achieve its investment objective.

BFA’s second step in the structuring of the Fund is the selection of the Underlying Funds. Factors such as fund classifications, historical risk and performance, and the relationship to other Underlying Funds in the Fund are considered when selecting Underlying Funds. The specific Underlying Funds selected for the Fund are determined at BFA’s discretion and may change as

deemed appropriate to allow the Fund to meet its investment objective. See the “Information About the Underlying Funds” section of the prospectus for a list of the Underlying Funds, their classification into equity, fixed-income or money market funds and a brief description of their investment objectives and primary investment strategies.

Within the prescribed percentage allocations to equity and fixed-income index funds, BFA seeks to diversify the Fund. The allocation to Underlying Funds that track equity indexes may be further diversified by style (including both value and growth), market capitalization (including emerging growth, large-, mid-, and small-capitalization), region (i.e., U.S, and international, including emerging markets) or other attributes. The allocation to Underlying Funds that track fixed-income indexes may be further diversified by sector (including government, corporate, U.S. agency MBS or debentures, CMBS, and other sectors), duration (a of measurement of interest rate risk), credit quality (including investment grade bonds and high yield bonds), geographic location (including U.S. and non-U.S. securities, including bonds of emerging market issuers), currency (U.S. dollar-denominated or local currency bonds) or other attributes. Though BFA seeks to diversify the Fund, certain Underlying Funds may concentrate their investments in specific sectors or geographic regions or countries. The percentage allocation to the various styles of equity and fixed-income Underlying Funds is determined at the discretion of the investment team and can be changed to reflect the current market environment.

Certain Underlying Funds may invest in real estate investment trusts (“REITs”), foreign securities, emerging market securities, high yield bonds and derivative securities or instruments, such as options and futures, the value of which is derived from another security, a currency or commodity, an interest rate or an index, when seeking to match the performance of a particular market index. The Fund and certain Underlying Funds may also lend securities with a value up to one-third of their respective total assets to financial institutions that provide cash or securities issued or guaranteed by the U.S. Government as collateral.

Risk [Heading]

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Summary of Principal Risks

Bar Chart and Performance Table [Heading]

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Performance Information

Performance Narrative [Text Block]

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As of the date of the Prospectus, the Fund has not commenced operations and therefore has no performance information to report.

Performance One Year or Less [Text]

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As of the date of the Prospectus, the Fund has not commenced operations and therefore has no performance information to report.

iShares LifePath Target Date 2040 ETF | Risk Lose Money [Member]

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Risk [Text Block]

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As with any investment, you could lose all or part of your investment in the Fund, and the Fund's performance could trail that of other investments.

iShares LifePath Target Date 2040 ETF | Equity Securities Risk [Member]

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Risk [Text Block]

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Equity Securities Risk. Equity securities are subject to changes in value, and their values may be more volatile than those of other asset classes. Certain Underlying Funds invest in common stocks, which generally subject their holders to more risks than preferred stocks and debt securities because common stockholders’ claims

are subordinated to those of holders of preferred stocks and debt securities upon the bankruptcy of the issuer.

iShares LifePath Target Date 2040 ETF | Credit Risk [Member]

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Risk [Text Block]

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Credit Risk. Debt issuers and other counterparties may be unable or unwilling to make timely interest and/or principal payments when due or otherwise honor their obligations. Changes in an issuer’s credit rating or the market’s perception of an issuer’s creditworthiness may also adversely affect the value of the Fund’s or an Underlying Fund's investment in that issuer. The degree of credit risk depends on an issuer's or counterparty's financial condition and on the terms of an obligation.

iShares LifePath Target Date 2040 ETF | Interest Rate Risks [Member]

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Interest Rate Risk. During periods of very low or negative interest rates, the Fund may be unable to maintain positive returns or pay dividends to Fund shareholders. Very low or negative interest rates may magnify interest rate risk. Changing interest rates, including rates that fall below zero, may have unpredictable effects on markets, result in heightened market volatility and detract from the Fund’s performance to the extent the Fund is exposed to such interest rates. Additionally, under certain market conditions in which interest rates are low and the market prices for portfolio securities have increased, the Fund may have a very low or even negative yield. A low or negative yield would cause the Fund to lose money in certain conditions and over certain time periods. An increase in interest rates will generally cause the value of securities held by the Fund or an Underlying Fund to decline, may lead to heightened volatility in the fixed-income markets and may adversely affect the liquidity of certain fixed-income investments, including those held by the Fund or an Underlying Fund. Because rates on certain floating rate debt securities typically reset only periodically, changes in prevailing interest rates (and particularly sudden and significant changes) can be expected to cause some fluctuations in the net asset value of the Fund to the extent that it invests in floating rate debt securities. The historically low interest rate environment in recent years heightens the risks associated with rising interest rates.

iShares LifePath Target Date 2040 ETF | U S Treasury Obligations Risk [Member]

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U.S. Treasury Obligations Risk. U.S. Treasury obligations may differ from other securities in their interest rates, maturities, times of issuance and other characteristics and may provide relatively lower returns than those of other securities. Similar to other issuers, changes to the financial condition or credit rating of a government may cause the value of the Fund's or an Underlying Fund's U.S. Treasury obligations to decline.

iShares LifePath Target Date 2040 ETF | Allocation Risk [Member]

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Allocation Risk. The Fund’s ability to achieve its investment objective depends upon BFA's ability to develop a model that accurately assesses the Fund’s asset class allocation and selects an appropriate mix of Underlying Funds and other ETFs. There is a risk that BFA's evaluations and assumptions regarding asset classes or Underlying Funds, which are utilized as inputs in the model, may be incorrect in view of actual market conditions.

iShares LifePath Target Date 2040 ETF | Investment in Underlying Funds Risk [Member]

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Investment in Underlying Funds Risk. The Fund invests substantially all of its assets in the Underlying Funds, so the Fund’s investment performance is directly related to the performance of the Underlying Funds. The Fund’s NAV will change with changes in the value of the Underlying Funds and other securities in which the Fund invests based on their market

valuations. An investment in the Fund will entail more costs and expenses than a direct investment in the Underlying Funds.

As the Underlying Funds, or the Fund’s allocations among the Underlying Funds, change from time to time, or to the extent that the total annual fund operating expenses of any Underlying Fund change, the weighted average operating expenses borne by the Fund may increase or decrease.

iShares LifePath Target Date 2040 ETF | Affiliated Fund Risk [Member]

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Affiliated Fund Risk. In managing the Fund, BFA has the ability to select Underlying Funds and substitute Underlying Funds with other ETFs that it believes will achieve the Fund’s objective. BFA may be subject to potential conflicts of interest in selecting Underlying Funds and substituting Underlying Funds with other ETFs because the fees paid to BFA by some Underlying Funds and other ETFs managed by BFA may be higher than the fees paid by other Underlying Funds. If an Underlying Fund or other ETF holds interests in an affiliated fund in excess of a certain amount, the Fund may be prohibited from purchasing shares of that Underlying Fund or other ETF.

iShares LifePath Target Date 2040 ETF | Retirement Income Risk [Member]

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Retirement Income Risk. The 2040 Fund does not provide a guarantee that sufficient capital appreciation will be achieved to provide adequate income at and through retirement. The 2040 Fund also does not ensure that you will have assets in your account sufficient to cover your retirement expenses; this will depend on the amount of money you have invested in the 2040 Fund, the length of time you have held your investment, the returns of the markets over time, the amount you spend in retirement, and your other assets and income sources.

iShares LifePath Target Date 2040 ETF | Selection Risk [Member]

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Selection Risk. Selection risk is the risk that the securities selected by the 2040 Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.

iShares LifePath Target Date 2040 ETF | Market Risk [Member]

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Market Risk. The Fund and the Underlying Funds could lose money over short periods due to short-term market movements and over longer periods during more prolonged market downturns. Local, regional or global events such as war, acts of terrorism, public health issues, recessions, the prospect or occurrence of a sovereign default or other financial crisis, or other events could have a significant impact on the Fund, the Underlying Funds and their investments and could result in increased premiums or discounts to the Fund’s or Underlying Fund's NAV.

iShares LifePath Target Date 2040 ETF | Asset Class Risk [Member]

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Asset Class Risk. Securities and other assets in the Fund's or an Underlying Fund's portfolio may underperform in comparison to the general financial markets, a particular financial market or other asset classes.

iShares LifePath Target Date 2040 ETF | Authorized Participant Concentration Risk [Member]

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Authorized Participant Concentration Risk.  Only an Authorized Participant (as defined in the Creations and Redemptions section of this prospectus (the “Prospectus”)) may engage in creation or redemption transactions directly with the Fund, and none of those Authorized Participants is obligated to engage in creation and/or redemption transactions. The Fund has a limited number of

institutions that may act as Authorized Participants on an agency basis (i.e., on behalf of other market participants). To the extent that Authorized Participants exit the business or are unable to proceed with creation or redemption orders with respect to the Fund and no other Authorized Participant is able to step forward to create or redeem, Fund shares may be more likely to trade at a premium or discount to NAV and possibly face trading halts or delisting. Authorized Participant concentration risk may be heightened for ETFs, such as the Fund, that invest in securities issued by non-U.S. issuers or other securities or instruments that have lower trading volumes.

iShares LifePath Target Date 2040 ETF | Call Risk [Member]

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Call Risk. During periods of falling interest rates, an issuer of a callable bond held by the Fund or an Underlying Fund may “call” or repay the security before its stated maturity, and the Fund or an Underlying Fund may have to reinvest the proceeds in securities with lower yields, which would result in a decline in the Fund's income, or in securities with greater risks or with other less favorable features.

iShares LifePath Target Date 2040 ETF | Concentration Risk [Member]

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Concentration Risk. The Fund may be susceptible to an increased risk of loss, including losses due to adverse events that affect the Fund’s investments more than the market as a whole, to the extent that the Fund's or an Underlying Fund's investments are concentrated in the securities and/or other assets of a particular issuer or issuers, country, group of countries, region, market, industry, group of industries, sector, market segment or asset class.

iShares LifePath Target Date 2040 ETF | Currency Risk [Member]

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Currency Risk. Because the Fund's and the Underlying Funds' NAVs are determined in U.S. dollars, the Fund's NAV could decline if a currency of a non-U.S. market in which a Fund or an Underlying Fund invests depreciates against the U.S. dollar or if there are delays or limits on repatriation of such currency. Currency exchange rates can be very volatile and can change quickly and unpredictably. As a result, the Fund's NAV may change quickly and without warning.

iShares LifePath Target Date 2040 ETF | Cybersecurity Risk [Member]

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Cybersecurity Risk. Failures or breaches of the electronic systems of the Fund or the Underlying Funds, the Funds' or the Underlying Funds' adviser, distributor, the benchmark provider and other service providers, market makers, Authorized Participants or the issuers of securities in which the Fund invests have the ability to cause disruptions, negatively impact the Fund’s business operations and/or potentially result in financial losses to the Fund and its shareholders. While the Fund has established business continuity plans and risk management systems seeking to address system breaches or failures, there are inherent limitations in such plans and systems. Furthermore, the Fund cannot control the cybersecurity plans and systems of the Fund’s benchmark provider and other service providers, market makers, Authorized Participants or issuers of securities in which the Fund invests.

iShares LifePath Target Date 2040 ETF | Derivatives Risk [Member]

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Derivatives Risk. The Fund  or an Underlying Fund may invest in certain types of derivatives contracts, including futures, options and swaps, which can be more sensitive to changes in interest rates or to sudden fluctuations in market prices than conventional securities, which can result in greater losses to the Fund.

iShares LifePath Target Date 2040 ETF | Energy Sector Risk [Member]

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Energy Sector Risk. The market value of securities in the energy sector may decline for many reasons, including, among others, changes in energy prices, energy supply and demand, government regulations, costs related to exploration and production and energy conservation efforts. Companies in the energy sector may also be significantly impacted by natural disasters, social and political unrest, war and environmental damage and may also be at risk for increased litigation and negative publicity or public perception. The energy sector may experience significant market volatility (e.g., as a result of Russia’s invasion of Ukraine in February 2022 and the resulting sanctions on Russia and other responses by the U.S. and other actors).

iShares LifePath Target Date 2040 ETF | Extension Risk [Member]

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Extension Risk. During periods of rising interest rates, certain debt obligations may be paid off substantially more slowly than originally anticipated and the value of those securities may fall sharply, resulting in a decline in the Fund’s income and potentially in the value of the Fund’s or an Underlying Fund's investments.

iShares LifePath Target Date 2040 ETF | Financials Sector Risk [Member]

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Financials Sector Risk. The performance of companies in the financials sector may be adversely impacted by many factors, including, among others, changes in government regulations, economic conditions, and interest rates, credit rating downgrades, adverse public perception, exposure concentration and decreased liquidity in credit markets. The impact of changes in regulation of any individual financial company, or of the financials sector as a whole, cannot be predicted. Cybersecurity incidents and technology malfunctions and failures have become increasingly frequent and have caused significant losses to companies in this sector, which may negatively impact an Underlying Fund.

iShares LifePath Target Date 2040 ETF | Geographic Risk [Member]

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Geographic Risk. A natural disaster could occur in a geographic region in which the Fund or an Underlying Fund invests, which could adversely affect the economy or the business operations of companies in the specific geographic region, causing an adverse impact on the Fund's or an Underlying Fund's investments in, or which are exposed to, the affected region.

iShares LifePath Target Date 2040 ETF | Healthcare Sector Risk [Member]

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Healthcare Sector Risk. The profitability of companies in the healthcare sector may be affected by government regulations and government healthcare programs, increases or decreases in the cost of medical products and services, an increased emphasis on outpatient services, demand for medical products and services and product liability claims, among other factors. Many healthcare companies are heavily dependent on patent protection, and the expiration of a company’s patent may adversely affect that company’s profitability. Healthcare companies are subject to competitive forces that may result in price discounting, and may be thinly capitalized and susceptible to product obsolescence.

iShares LifePath Target Date 2040 ETF | Income Risk [Member]

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Income Risk. The Fund's income may decline if interest rates fall. This decline in income can occur because an Underlying Fund may subsequently invest in lower-yielding securities as securities in an Underlying Fund's portfolio mature, are near maturity or are called, securities are substituted, or an Underlying Fund otherwise needs to purchase additional bonds.

iShares LifePath Target Date 2040 ETF | Indexing Investment Risk [Member]

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Indexing Investment Risk. The Underlying Funds are not actively managed, and BFA generally does not attempt to take defensive positions in the Underlying Funds under any market conditions, including declining markets.

iShares LifePath Target Date 2040 ETF | Industrials Sector Risk [Member]

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Industrials Sector Risk. Companies in the industrials sector may be adversely affected by changes in the supply of and demand for products and services, product obsolescence, claims for environmental damage or product liability and changes in general economic conditions, among other factors.

iShares LifePath Target Date 2040 ETF | Infectious Illness Risk [Member]

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Infectious Illness Risk. A widespread outbreak of an infectious illness, such as the COVID-19 pandemic, may result in travel restrictions, disruption of healthcare services, prolonged quarantines, cancellations, supply chain disruptions, business closures, lower consumer demand, layoffs, ratings downgrades, defaults and other significant economic, social and political impacts. Markets may experience temporary closures, extreme volatility, severe losses, reduced liquidity and increased trading costs. Such events may adversely affect the Fund and its investments and may impact the Fund’s ability to purchase or sell securities or cause elevated tracking error and increased premiums or discounts to the Fund's NAV. Despite the development of vaccines, the duration of the COVID-19 pandemic and its effects cannot be predicted with certainty.

iShares LifePath Target Date 2040 ETF | Information Technology Sector Risk [Member]

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Information Technology Sector Risk. Information technology companies face intense competition and potentially rapid product obsolescence. They are also heavily dependent on intellectual property rights and may be adversely affected by the loss or impairment of those rights. Companies in the information technology sector are facing increased government and regulatory scrutiny and may be subject to adverse government or regulatory action. Companies in the software industry may be adversely affected by, among other things, the decline or fluctuation of subscription renewal rates for their products and services and actual or perceived vulnerabilities in their products or services.

iShares LifePath Target Date 2040 ETF | Infrastructure Industry Risk [Member]

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Infrastructure Industry Risk. Companies in the infrastructure industry may be subject to a variety of factors that could adversely affect their business or operations, including high interest costs in connection with capital construction programs, high degrees of leverage, costs associated with governmental, environmental and other regulations, the level of government spending on infrastructure projects, and other factors.

iShares LifePath Target Date 2040 ETF | Issuer Risk [Member]

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Issuer Risk. The performance of the Fund depends on the performance of individual securities to which the Fund or an Underlying Fund has exposure. Changes in the financial condition or credit rating of an issuer of those securities may cause the value of the securities to decline.

iShares LifePath Target Date 2040 ETF | Large Capitalization Companies Risk [Member]

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Large-Capitalization Companies Risk. Large-capitalization companies may be less able than smaller capitalization companies to adapt to changing market conditions. Large-capitalization companies may be more mature and subject to more limited growth potential compared with smaller capitalization companies. During different market cycles, the

performance of large-capitalization companies has trailed the overall performance of the broader securities markets.

iShares LifePath Target Date 2040 ETF | Management Risk [Member]

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Management Risk. The Fund and the Underlying Funds are subject to management risk, which is the risk that the investment process, techniques and risk analyses applied by BFA will not produce the desired results, and that securities selected by BFA may underperform the market or any relevant benchmark. In addition, legislative, regulatory, or tax developments may affect the investment techniques available to BFA in connection with managing the Fund and the Underlying Funds and may also adversely affect the ability of the Fund and the Underlying Funds to achieve their investment objective.

iShares LifePath Target Date 2040 ETF | Market Trading Risk [Member]

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Market Trading Risk. The Fund and the Underlying Funds face numerous market trading risks, including the potential lack of an active market for their shares, losses from trading in secondary markets, periods of high volatility and disruptions in the creation/redemption process. ANY OF THESE FACTORS, AMONG OTHERS, MAY LEAD TO THE FUND'S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV.

iShares LifePath Target Date 2040 ETF | Mid Capitalization Companies Risk [Member]

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Mid-Capitalization Companies Risk. Compared to large-capitalization companies, mid-capitalization companies may be less stable and more susceptible to adverse developments. In addition, the securities of mid-capitalization companies may be more volatile and less liquid than those of large-capitalization companies.

iShares LifePath Target Date 2040 ETF | National Closed Market Trading Risk [Member]

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National Closed Market Trading Risk. To the extent that the underlying securities or other instruments held by the Fund or the Underlying Funds trade on foreign exchanges or in foreign markets that may be closed when the securities exchange on which the Fund’s or an Underlying Fund's shares trade is open, there are likely to be deviations between the current price of such an underlying security and the last quoted price for the underlying security (i.e., the Fund’s or an Underlying Fund's quote from the closed foreign market). The impact of a closed foreign market on the Fund or an Underlying Fund is likely to be greater where a large portion of the Fund’s or an Underlying Fund's underlying securities or other instruments trade on that closed foreign market or when the foreign market is closed for unscheduled reasons. These deviations could result in premiums or discounts to the Fund’s or an Underlying Fund's NAV that may be greater than those experienced by other ETFs.

iShares LifePath Target Date 2040 ETF | Non U S Issuers Risk [Member]

Risk/Return:

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Risk [Text Block]

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Non-U.S. Issuers Risk. Securities issued by non-U.S. issuers carry different risks from securities issued by U.S. issuers. These risks include differences in accounting, auditing and financial reporting standards, the possibility of expropriation or confiscatory taxation, adverse changes in investment or exchange control regulations, political instability, regulatory and economic differences, and potential restrictions on the flow of international capital. The Fund is specifically exposed to Asian Economic Risk, European Economic Risk and North American Economic Risk.

iShares LifePath Target Date 2040 ETF | Non U S Securities Risk [Member]

Risk/Return:

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Risk [Text Block]

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Non-U.S. Securities Risk. Investments in the securities of non-U.S. issuers are subject to the risks associated with investing in

those non-U.S. markets, such as heightened risks of inflation or nationalization. The Fund or an Underlying Fund
may lose money due to political, economic and geographic events affecting issuers of non-U.S. securities or non-U.S. markets. In addition, non-U.S. securities markets may trade a small number of securities and may be unable to respond effectively to changes in trading volume, potentially making prompt liquidation of holdings difficult or impossible at times. The Fund is specifically exposed to Asian Economic Risk, European Economic Risk and North American Economic Risk.

iShares LifePath Target Date 2040 ETF | Operational Risk [Member]

Risk/Return:

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Risk [Text Block]

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Operational Risk. The Fund and the Underlying Funds are exposed to operational risks arising from a number of factors, including, but not limited to, human error, processing and communication errors, errors of the Fund’s service providers, counterparties or other third parties, failed or inadequate processes and technology or systems failures. The Fund, the Underlying Funds and BFA seek to reduce these operational risks through controls and procedures. However, these measures do not address every possible risk and may be inadequate to address significant operational risks.

iShares LifePath Target Date 2040 ETF | Prepayment Risk [Member]

Risk/Return:

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Risk [Text Block]

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Prepayment Risk. During periods of falling interest rates, issuers of certain debt obligations may repay principal prior to the security’s maturity, which may cause the Fund to have to reinvest in securities with lower yields or higher risk of default, resulting in a decline in the Fund’s income or return potential.

iShares LifePath Target Date 2040 ETF | Real Estate Investment Risk [Member]

Risk/Return:

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Real Estate Investment Risk. Companies that invest in real estate (“Real Estate Companies”), such as REITs, real estate holding and operating companies and real estate management or development companies, expose investors in the Fund to the risks of owning real estate directly, as well as to risks that relate specifically to the way in which Real Estate Companies are organized and operated. Real estate is highly sensitive to general and local economic conditions and developments, and characterized by intense competition and periodic overbuilding. If the Fund's investments in Real Estate Companies are concentrated in one geographic region, industry or property type, the Fund will be particularly subject to the risks associated with that region, industry or property type. Many Real Estate Companies, including REITs,  utilize leverage (and some may be highly leveraged), which increases investment risk and the risk normally associated with debt financing, and could potentially magnify the Fund’s losses. Rising interest rates could result in higher costs of capital for Real Estate Companies, which could negatively affect a Real Estate Company's ability to meet its payment obligations or its financing activity and could decrease the market prices for REITs and for properties held by such REITs.

iShares LifePath Target Date 2040 ETF | Reinvestment Risk [Member]

Risk/Return:

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Risk [Text Block]

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Reinvestment Risk. The Fund  or an Underlying Fund may invest a portion of its assets in short-term fixed-income instruments and, as a result, may be adversely affected if interest rates fall because they may have to invest in lower-yielding bonds as bonds mature.

iShares LifePath Target Date 2040 ETF | Risk of Investing in China [Member]

Risk/Return:

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Risk of Investing in China. Investments in Chinese securities, including certain Hong Kong-listed and U.S.-listed securities, subject the Fund or the Underlying Funds to risks specific to China. China may be subject to considerable degrees of

economic, political and social instability. China is an emerging market and demonstrates significantly higher volatility from time to time in comparison to developed markets. Over the last few decades, the Chinese government has undertaken reform of economic and market practices and has expanded the sphere of private ownership of property in China. However, Chinese markets generally continue to experience inefficiency, volatility and pricing anomalies resulting from governmental influence, a lack of publicly available information and/or political and social instability.

Chinese companies are also subject to the risk that Chinese authorities can intervene in their operations and structure. Internal social unrest or confrontations with neighboring countries, including military conflicts in response to such events, may also disrupt economic development in China and result in a greater risk of currency fluctuations, currency non-convertibility, interest rate fluctuations and higher rates of inflation.

China has experienced security concerns, such as terrorism and strained international relations. Additionally, China is alleged to have participated in state-sponsored cyberattacks against foreign companies and foreign governments. Actual and threatened responses to such activity and strained international relations, including purchasing restrictions, sanctions, tariffs or cyberattacks on the Chinese government or Chinese companies, may impact China’s economy and Chinese issuers of securities in which the Fund invests. Incidents involving China's or the region's security may cause uncertainty in Chinese markets and may adversely affect the Chinese economy and the Fund's investments. Export growth continues to be a major driver of China's rapid economic growth. Reduction in spending on Chinese products and services, institution of additional tariffs or other trade barriers (including as a result of heightened trade tensions or a trade war between China and the U.S. or in response to actual or alleged Chinese cyber activity) or a downturn in any of the economies of China's key trading partners may have an adverse impact on the Chinese economy.

Chinese companies, including Chinese companies that are listed on U.S. exchanges, are not subject to the same degree of regulatory requirements, accounting standards or auditor oversight as companies in more developed countries. As a result, information about the Chinese securities in which the Fund invests may be less reliable or complete. Chinese companies with securities listed on U.S. exchanges may be delisted if they do not meet U.S. accounting standards and auditor oversight requirements, which would significantly decrease the liquidity and value of the securities. There may be significant obstacles to obtaining information necessary for investigations into or litigation against Chinese companies, and shareholders may have limited legal remedies. The Fund is not actively managed and does not select investments based on investor protection considerations.

iShares LifePath Target Date 2040 ETF | Risk of Investing in Developed Countries [Member]

Risk/Return:

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Risk of Investing in Developed Countries. The Fund’s and the Underlying Fund's investment in developed country issuers may subject the Fund to legal, regulatory, political, currency, security, economic and other risks associated with developed countries. Developed countries tend to represent a significant portion of the

global economy and have generally experienced slower economic growth than some less developed countries. Certain developed countries have experienced security concerns, such as war, terrorism and strained international relations. Incidents involving a country’s or region’s security may cause uncertainty in its markets and may adversely affect its economy and the Fund’s or an Underlying Fund's investments. In addition, developed countries may be adversely impacted by changes to the economic conditions of certain key trading partners, regulatory burdens, debt burdens and the price or availability of certain commodities.

iShares LifePath Target Date 2040 ETF | Risk of Investing in India [Member]

Risk/Return:

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Risk [Text Block]

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Risk of Investing in India. Investments in Indian issuers involve risks that are specific to India, including legal, regulatory, political, currency and economic risks. Political and legal uncertainty, greater government control over the economy, currency fluctuations or blockage, and the risk of nationalization or expropriation of assets may result in higher potential for losses. The securities markets in India are relatively underdeveloped and may subject the Fund or an Underlying Fund to higher transaction costs or greater uncertainty than investments in more developed securities markets.

iShares LifePath Target Date 2040 ETF | Risk of Investing in Japan [Member]

Risk/Return:

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Risk of Investing in Japan. The Japanese economy may be subject to considerable degrees of economic, political and social instability, which could have a negative impact on Japanese securities. Since 2000, Japan’s economic growth rate has generally remained low relative to other advanced economies, and it may remain low in the future. In addition, Japan is subject to the risk of natural disasters, such as earthquakes, volcanic eruptions, typhoons and tsunamis, which could negatively affect the Fund or an Underlying Fund. Japan’s relations with its neighbors have at times been strained, and strained relations may cause uncertainty in the Japanese markets and adversely affect the overall Japanese economy.

iShares LifePath Target Date 2040 ETF | Risk of Investing in Russia [Member]

Risk/Return:

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Risk of Investing in Russia. Investing in Russian securities involves significant risks, including legal, regulatory, currency and economic risks that are specific to Russia. In addition, investing in Russian securities involves risks associated with the settlement of portfolio transactions and loss of the Fund’s or an Underlying Fund's ownership rights in its portfolio securities as a result of the system of share registration and custody in Russia. Governments in the U.S. and many other countries have imposed economic sanctions on certain Russian individuals and Russian corporate and banking entities. A number of jurisdictions may also institute broader sanctions on Russia. Russia has issued a number of countersanctions, some of which restrict the distribution of profits by limited liability companies (e.g., dividends), and prohibit Russian persons from entering into transactions with designated persons from “unfriendly states” as well as the export of raw materials or other products from Russia to certain sanctioned persons. Russia launched a large-scale invasion of Ukraine on February 24, 2022. The extent and duration of the military action, resulting sanctions and resulting future market disruptions, including declines in its stock markets and the value of the ruble against the U.S. dollar, are impossible to predict, but could be significant. Disruptions caused by Russian military action or other actions (including cyberattacks and espionage) or resulting actual and threatened responses to such activity, including purchasing and financing restrictions, boycotts or changes in consumer or

purchaser preferences, sanctions, import and export restrictions, tariffs or cyberattacks on the Russian government, Russian companies, or Russian individuals, including politicians, may impact Russia’s economy and Russian companies in which the Fund  or an Underlying Fund invests. Actual and threatened responses to Russian military action may also impact the markets for certain Russian commodities, such as oil and natural gas, as well as other sectors of the Russian economy, and are likely to have collateral impacts on such sectors globally. Russian companies may be unable to pay dividends and, if they pay dividends, the Fund  or an Underlying Fund may be unable to receive them. As a result of sanctions, the Fund is currently restricted from trading in Russian securities, including those in its portfolio, while the Underlying Indexes of the Underlying Funds have removed Russian securities. It is unknown when, or if, sanctions may be lifted or the Fund’s ability to trade in Russian securities will resume.

iShares LifePath Target Date 2040 ETF | Risk of Investing in Saudi Arabia [Member]

Risk/Return:

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Risk of Investing in Saudi Arabia. The ability of foreign investors (such as the Fund or an Underlying Fund) to invest in the securities of Saudi Arabian issuers is relatively new. Such ability could be restricted by the Saudi Arabian government at any time, and unforeseen risks could materialize with respect to foreign ownership in such securities. The economy of Saudi Arabia is dominated by petroleum exports. A sustained decrease in petroleum prices could have a negative impact on all aspects of the economy. Investments in the securities of Saudi Arabian issuers involve risks not typically associated with investments in securities of issuers in more developed countries that may negatively affect the value of the Fund’s or Underlying Fund's investments. Such heightened risks may include, among others, expropriation and/or nationalization of assets, restrictions on and government intervention in international trade, confiscatory taxation, political instability, including authoritarian and/or military involvement in governmental decision making, armed conflict, crime and instability as a result of religious, ethnic and/or socioeconomic unrest. There remains the possibility that instability in the larger Middle East region could adversely impact the economy of Saudi Arabia, and there is no assurance of political stability in Saudi Arabia.

iShares LifePath Target Date 2040 ETF | Saudi Arabia Broker Risk [Member]

Risk/Return:

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Risk [Text Block]

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Saudi Arabia Broker Risk.  There are a number of different ways of conducting transactions in equity securities in the Saudi Arabian market.  The Fund (or an Underlying Fund) generally expects to conduct its transactions in a manner in which the Fund would not be limited by Saudi Arabian regulations to a single broker. However, there may be a limited number of brokers who can provide services to the Fund (or an Underlying Fund), which may have an adverse impact on the prices, quantity or timing of Fund (or an Underlying Fund) transactions.

iShares LifePath Target Date 2040 ETF | Risk of Investing in Taiwan [Member]

Risk/Return:

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Risk [Text Block]

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Risk of Investing in Taiwan. Investments in Taiwanese issuers involve risks that are specific to Taiwan, including legal, regulatory, political, currency and economic risks. Political and economic developments of Taiwan’s neighbors may have an adverse effect on Taiwan’s economy. Specifically, Taiwan’s geographic proximity and history of political contention with China have resulted in ongoing tensions, which may materially affect the Taiwanese economy and its securities market.

iShares LifePath Target Date 2040 ETF | Risk of Investing in the U S [Member]

Risk/Return:

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Risk [Text Block]

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Risk of Investing in the U.S. Certain changes in the U.S. economy, such as when the U.S. economy weakens or when its financial markets decline, may have an adverse effect on the securities to which the Fund or the Underlying Funds has exposure.

iShares LifePath Target Date 2040 ETF | Securities Lending Risk [Member]

Risk/Return:

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Risk [Text Block]

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Securities Lending Risk. The Fund  or an Underlying Fund may engage in securities lending. Securities lending involves the risk that the Fund or the Underlying Funds may lose money because the borrower of the loaned securities fails to return the securities in a timely manner or at all. The Fund or the Underlying Funds could also lose money in the event of a decline in the value of collateral provided for loaned securities or a decline in the value of any investments made with cash collateral. These events could also trigger adverse tax consequences for the Fund or an Underlying Fund.

iShares LifePath Target Date 2040 ETF | Small Capitalization Companies Risk [Member]

Risk/Return:

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Risk [Text Block]

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Small-Capitalization Companies Risk. Compared to mid- and large-capitalization companies, small-capitalization companies may be less stable and more susceptible to adverse developments. In addition, the securities of small-capitalization companies may be more volatile and less liquid than those of mid- and large-capitalization companies.

iShares LifePath Target Date 2040 ETF | Tax Risk [Member]

Risk/Return:

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Risk [Text Block]

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Tax Risk. Because the Fund is expected to invest in the Underlying Funds, the Fund’s realized losses on sales of shares of an Underlying Fund may be indefinitely or permanently deferred as “wash sales.” Distributions of short-term capital gains by an Underlying Fund will be recognized as ordinary income by the Fund and would not be offset by the Fund’s capital loss carryforwards, if any. Capital loss carryforwards of an Underlying Fund, if any, would not offset net capital gains of the Fund.

iShares LifePath Target Date 2040 ETF | Technology Sector Risk [Member]

Risk/Return:

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Risk [Text Block]

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Technology Sector Risk. Technology companies, including information technology companies, may have limited product lines, markets, financial resources or personnel. Technology companies typically face intense competition and potentially rapid product obsolescence. They are also heavily dependent on intellectual property rights and may be adversely affected by the loss or impairment of those rights. Companies in the technology sector may face increased government and regulatory scrutiny and may be subject to adverse government or regulatory action.

iShares LifePath Target Date 2040 ETF | Utilities Sector Risk [Member]

Risk/Return:

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Risk [Text Block]

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Utilities Sector Risk. The utilities sector is subject to significant government regulation and oversight. Deregulation, however, may subject utility companies to greater competition and may reduce their profitability. Companies in the utilities sector may be adversely affected due to increases in fuel and operating costs, rising costs of financing capital construction and the cost of complying with U.S. federal and state regulations, among other factors.

iShares LifePath Target Date 2040 ETF | Valuation Risk [Member]

Risk/Return:

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Risk [Text Block]

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Valuation Risk. The price the Fund  or an Underlying Fund could receive upon the sale of a security or other asset may differ from the Fund's or the Underlying Fund's valuation of the security or other asset, particularly for securities or other assets that trade in low volume or volatile markets, or assets that are impacted by market disruption events or that are valued using a fair value methodology as a result of trade suspensions or for other

reasons. In addition, the value of the securities or other assets in the Fund's or an Underlying Fund's portfolio may change on days or during time periods when shareholders will not be able to purchase or sell the Fund's or an Underlying Fund's shares. Authorized Participants who purchase or redeem shares of the Fund or an Underlying Fund on days when the Fund or an Underlying Fund is holding fair-valued securities or other instruments may receive fewer or more shares, or lower or higher redemption proceeds, than they would have received had the securities or other instruments not been fair valued or been

valued using a different methodology. The ability to value investments may be impacted by technological issues or errors by pricing services or other third-party service providers.

iShares LifePath Target Date 2040 ETF | iShares LifePath Target Date 2040 ETF

Risk/Return:

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Management Fees

rr_ManagementFeesOverAssets

none

^[1]

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

^[1]

Other Expenses

rr_OtherExpensesOverAssets

none

^[1],[2]

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.11%

^[1],[3]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.11%

^[1]

1 Year

rr_ExpenseExampleYear01

$ 11

3 Years

rr_ExpenseExampleYear03

$ 35

[1] Operating expenses paid by BFA under the Investment Advisory Agreement exclude Acquired Fund Fees and Expenses, if any.

[2] The amount of Other Expenses rounded to 0.00%.

[3] As the Fund has not commenced operations prior to the date of the Fund's Prospectus, Acquired Fund Fees and Expenses are based on an estimate of the Fund's allocation to other investment companies for the current fiscal year.