| Label | Element | Value | ||||
|---|---|---|---|---|---|---|
| iShares Russell 2000 BuyWrite ETF | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk/Return [Heading] | rr_RiskReturnHeading | iSHARES® RUSSELL 2000 BUYWRITE ETF Ticker: IWMWStock Exchange: Cboe BZX | ||||
| Objective [Heading] | rr_ObjectiveHeading | Investment Objective | ||||
| Objective, Primary [Text Block] | rr_ObjectivePrimaryTextBlock | The iShares Russell 2000 BuyWrite ETF (the “Fund”) seeks to track the investment results of an index that reflects a strategy of holding the iShares Russell 2000 ETF while writing (selling) one-month call options to generate income.
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| Expense [Heading] | rr_ExpenseHeading | Fees and Expenses | ||||
| Expense Narrative [Text Block] | rr_ExpenseNarrativeTextBlock | 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 Fund's total return but is not included in the Fund's ratio of expenses to average net assets. Both figures are 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.
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| Operating Expenses Caption [Text] | rr_OperatingExpensesCaption | Annual Fund Operating Expenses(ongoing expenses that you pay each year as apercentage of the value of your investments)1 | ||||
| Portfolio Turnover [Heading] | rr_PortfolioTurnoverHeading | Portfolio Turnover. | ||||
| Portfolio Turnover [Text Block] | rr_PortfolioTurnoverTextBlock | The Fund or the Underlying Fund may pay transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate for the Fund or the Underlying Fund may indicate higher transaction costs and may cause the Fund or the Underlying Fund to incur increased expenses. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example(except costs to the Underlying Fund included as part of acquired fund fees and expenses), affect the Fund’s performance. From inception (March 14, 2024) to the most recent fiscal year end, the Fund's portfolio turnover rate was 3% of the average value of its portfolio. To the extent the Underlying Fund incurs costs from high portfolio turnover, such costs may have a negative effect on the performance of the Fund. | ||||
| Portfolio Turnover, Rate | rr_PortfolioTurnoverRate | 3.00% | ||||
| Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] | rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees | The impact of Acquired Fund Fees and Expenses is included in the Fund's total return but is not included in the Fund's ratio of expenses to average net assets. Both figures are shown in the Financial Highlights section of the Fund's prospectus (the “Prospectus”). | ||||
| Expense Example [Heading] | rr_ExpenseExampleHeading | Example. | ||||
| Expense Example Narrative [Text Block] | rr_ExpenseExampleNarrativeTextBlock | 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] | rr_StrategyHeading | Principal Investment Strategies | ||||
| Strategy Narrative [Text Block] | rr_StrategyNarrativeTextBlock | The Fund seeks to track the investment results of the Cboe FTSE Russell IWM 2% OTM BuyWrite Index (the “Underlying Index”). The Underlying Index is designed to measure the performance of a strategy of holding the iShares Russell 2000 ETF (the “Underlying Fund”) while writing (selling) one-month call options primarily on the Russell 2000 Index (the “Option Index”) to generate income. The Fund seeks to achieve its investment objective by investing a substantial portion of its assets in the Underlying Fund and options on the Option Index. A strategy of holding a stock or basket of stocks and selling call options that reference the stock or basket of stocks is commonly known as a “covered call” or “buy-write” strategy. The Underlying Index is a product of Cboe Global Indices, LLC or its affiliates (the “Index Provider” or “CGI”) and FTSE Russell or its affiliates (“Russell”), the index provider for the Underlying Fund. The Underlying Fund seeks to track the investment results of the Option Index, which measures the performance of the small-capitalization sector of the U.S. equity market, as defined by Russell. The Option Index is a float-adjusted capitalization-weighted index of equity securities issued by the approximately 1,921 smallest issuers in the Russell 3000 Index. The securities in the Option Index represent a broad range of industries. The Underlying Index uses “European-style” call options, which can be exercised only on their expiration date. The options trade on national securities exchanges. In writing a call option, the Fund receives a premium, and the purchaser of the option has the right to buy the value of the Option Index at the option’s strike price at expiration. However, the Fund does not expect to settle the outstanding option positions; generally, it purchases offsetting call options on the roll date (as defined below) as necessary to close out the open call position(s). Although the Fund receives option premiums, it does not participate in any market gains of the Underlying Fund that exceed the equivalent strike price of the option on the Option Index. The Fund fully participates in any declines in the value of the Underlying Fund. The Fund seeks to write call options equal to the full notional amount of shares of the Underlying Fund. In other words, the Fund aims for its short option position in the Option Index to be fully offset, or “covered,” by the long position that the Fund holds in shares of the Underlying Fund. At times, however, there may be a notional mismatch due to differences between the Underlying Fund and the Option Index with respect to pricing, tracking error, dividends, and other factors. In addition, the Fund may opt not to write any options in certain circumstances, primarily if the option is far “out of the money” (i.e., the strike price exceeds the price of the Option Index) and would generate minimal premium income. Each call option used in the Underlying Index has a strike price closest to 102% of the closing value of the Option Index one day prior to the roll date. The roll date is the day that open call option positions are closed out by purchasing the offsetting call option positions and subsequently writing new call options that expire the following month. The roll date is the business day preceding the expiration date of the options in the Underlying Index. The Underlying Index is rebalanced monthly at the close of trading on the roll date. If, on the day prior to the roll date, the premium that an option writer would hypothetically receive on the new 102% call option is less than five basis points of the closing value of the Option Index on that day, the Underlying Index will instead select the call option with the strike price closest to 100% of the closing value of the Option Index. Selecting an option with a strike price closest to 100% (rather than 102%) in these circumstances is designed to avoid writing an option whose potential trading costs would exceed the option’s premium. The Fund may write options on different dates than the Underlying Index’s roll date and may use strike prices, contract sizes, or maturity dates that are different than those for the options used in the Underlying Index. In addition, the Fund may write options that are not on the Option Index but that have investment and fundamental characteristics, in the aggregate, similar to the options used in the Underlying Index. The Fund makes monthly distributions consisting of the option premium received and any dividends received from the Underlying Fund, subject to a cap of 2% of the Fund’s NAV per month. The Fund is likely to distribute an amount greater than its earnings and profits, resulting in a return of capital. As of October 31, 2024, a significant portion of the Underlying Index is represented, through its holdings in the Underlying Fund, by securities of companies in the financials, healthcare and industrials sectors. BFA uses an indexing approach to try to achieve the Fund’s investment objective. The Fund does not try to “beat” the index it tracks and does not seek temporary defensive positions when markets decline or appear overvalued. Indexing may eliminate the chance that the Fund will substantially outperform the Underlying Index but also may reduce some of the risks of active management, such as poor security selection. Indexing seeks to achieve lower costs and better after-tax performance by aiming to keep portfolio turnover low in comparison to actively managed investment companies. BFA uses a representative sampling indexing strategy to manage the Fund and the Underlying Fund. “Representative sampling” is an indexing strategy that involves investing in a representative sample of securities that collectively has an investment profile similar to that of an applicable underlying index. The securities or other instruments selected are expected to have, in the aggregate, investment characteristics (based on factors such as market value and industry weightings), fundamental characteristics (such as return variability and yield) and liquidity measures similar to those of an applicable underlying index. The Fund and the Underlying Fund may not hold all of the securities or other instruments in the applicable Underlying Index and may hold certain securities or other instruments that are not included in the applicable Underlying Index. The Underlying Index is provided by the Index Provider and Russell and is independent of the Fund and BFA. The Index Provider determines the composition and relative weightings of the securities and other instruments in the Underlying Index and publishes information regarding the market value of the Underlying Index. Industry Concentration Policy. The Fund will concentrate its investments (i.e., hold 25% or more of its total assets) in a particular industry or group of industries to approximately the same extent that the Underlying Index is concentrated. For purposes of this limitation, securities of the U.S. government (including its agencies and instrumentalities) and repurchase agreements collateralized by U.S. government securities are not considered to be issued by members of any industry.
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| Strategy Portfolio Concentration [Text] | rr_StrategyPortfolioConcentration | Industry Concentration Policy. The Fund will concentrate its investments (i.e., hold 25% or more of its total assets) in a particular industry or group of industries to approximately the same extent that the Underlying Index is concentrated. For purposes of this limitation, securities of the U.S. government (including its agencies and instrumentalities) and repurchase agreements collateralized by U.S. government securities are not considered to be issued by members of any industry. | ||||
| Risk [Heading] | rr_RiskHeading | Summary of Principal Risks | ||||
| Bar Chart and Performance Table [Heading] | rr_BarChartAndPerformanceTableHeading | Performance Information | ||||
| Performance Narrative [Text Block] | rr_PerformanceNarrativeTextBlock | As of the date of this Prospectus, the Fund does not have a full calendar year of performance information to report.
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| Performance One Year or Less [Text] | rr_PerformanceOneYearOrLess | As of the date of this Prospectus, the Fund does not have a full calendar year of performance information to report. | ||||
| iShares Russell 2000 BuyWrite ETF | Risk Lose Money [Member] | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | 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 Russell 2000 BuyWrite ETF | Covered Call Option Risk [Member] | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | Covered Call Option Risk. The Fund seeks to tracks the performance of the Underlying Index in part by writing covered call options on the Option Index in return for the receipt of premiums. In so doing, the Fund gives up the opportunity to benefit from potential increases in the value of the Option Index above the exercise price of the options. The Fund also continues to bear the risk of declines in the value of the Underlying Fund, which is closely correlated to the value of the Option Index. The premiums received from the options may not be sufficient to offset any losses sustained from the volatility of the Option Index and the Underlying Fund over time. In addition, the Fund’s ability to sell shares of the Underlying Fund is limited while the option is in effect unless the Fund extinguishes the option position through the purchase of an offsetting identical option prior to the expiration of the written option. The covered call strategy may be subject to imperfect matching or price correlation between the written options on the Option Index and the Underlying Fund, which could reduce the Fund’s returns. Exchanges may suspend the trading of options (for example, due to volatile markets or if trading in other index-related instruments is halted). If trading is suspended, the Fund may be unable to write or purchase options at times that may be desirable or advantageous to the Fund to do so. If the Fund is unable to extinguish the option position before exercise, the Fund may be required to sell shares of the Underlying Fund, which may result in increased transaction costs, tracking error, over- or under-investment, and potentially the realization of capital gains. Further, this could lead to selling the corresponding options at a less favorable price than the Fund might have received had the options been extinguished. The Fund uses options that are struck once per month, and the timing of changes in the price of the Underlying Fund and the Option Index may affect the Fund’s performance. For example, if the Underlying Fund or the Option Index experiences a drop in price followed by a quick rebound, the Fund may be unable to fully participate in the rebound if the rebound occurs immediately after the Fund’s roll date. In addition, if trading is suspended, the Fund may be unable to purchase an offsetting option for purposes of closing out an existing written option at the originally scheduled time and date. The options written by the Fund are not expected to be treated as “covered” as defined under FINRA Rule 2360, in part due to the nature of the underlier (i.e., the Option Index). Instead, the Fund is expected to post margin with a clearing broker to satisfy regulatory margin requirements with respect to the written options. The Fund is subject to the risk that the clearing broker could default on its obligation to return the margin posted in connection with the options written by the Fund. In the event of such a default, the Fund could experience lengthy delays in recovering its assets or obtain no recovery at all, and the value of an investment in Fund shares would likely decrease.
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| iShares Russell 2000 BuyWrite ETF | Risk of Investing in the U S [Member] | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | Risk of Investing in the U.S. Investing in U.S. issuers subjects the Fund to legal, regulatory, political, currency, security, and economic risks that are specific to the U.S. Certain changes in the U.S., such as a weakening of the U.S. economy or a decline in its financial markets, may have an adverse effect on U.S. issuers.
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| iShares Russell 2000 BuyWrite ETF | Small Capitalization Companies Risk [Member] | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | Small-Capitalization Companies Risk. Compared to mid- and large-capitalization companies, small-capitalization companies may be less stable and more susceptible to adverse developments. The securities of small-capitalization companies may be more volatile and less liquid than those of mid- and large-capitalization companies. As a result, the Fund’s share price may be more volatile than that of a fund with a greater investment in large- or mid-capitalization stocks.
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| iShares Russell 2000 BuyWrite ETF | Market Risk [Member] | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | Market Risk. The Fund 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, pandemics or other 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 and its investments and could result in increased premiums or discounts to the Fund’s NAV.
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| iShares Russell 2000 BuyWrite ETF | Index Related Risk [Member] | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | Index-Related Risk. The Index Provider may rely on various sources of information to assess the criteria of components of the Underlying Index, including information that may be based on assumptions and estimates. Neither the Fund nor BFA can offer assurances that the Index Provider’s methodology or sources of information will provide an accurate assessment of included components or will result in the Fund meeting its investment objective. Errors in index data, index computations or the construction of the Underlying Index in accordance with its methodology may occur, and the Index Provider may not identify or correct them promptly or at all, which may have an adverse impact on the Fund and its shareholders. Unusual market conditions or other unforeseen circumstances (such as natural disasters, political unrest or war) may impact the Index Provider or a third-party data provider and could cause the Index Provider to postpone a scheduled rebalance. This could cause the Underlying Index to vary from its normal or expected composition.
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| iShares Russell 2000 BuyWrite ETF | Asset Class Risk [Member] | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | Asset Class Risk. The securities and other assets in the Underlying Index or in the Fund’s portfolio may underperform in comparison to financial markets generally, a particular financial market, another index, or other asset classes.
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| iShares Russell 2000 BuyWrite ETF | Assets Under Management AUM Risk [Member] | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | Assets Under Management (AUM) Risk. From time to time, an Authorized Participant (as defined below in Authorized Participant Concentration Risk), a third-party investor, the Fund’s adviser, an affiliate of the Fund’s adviser, or another fund may invest in the Fund and hold its investment for a specific period of time to allow the Fund to achieve size or scale. There can be no assurance that any such entity would not redeem its investment or that the size of the Fund would be maintained at such levels, which could negatively impact the Fund.
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| iShares Russell 2000 BuyWrite ETF | Authorized Participant Concentration Risk [Member] | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | Authorized Participant Concentration Risk. An “Authorized Participant” is a member or participant of a clearing agency registered with the SEC, which has a written agreement with the Fund or one of its service providers that allows the Authorized Participant to place orders for the purchase and redemption of creation units (“Creation Units”). Only an Authorized Participant may engage in creation or redemption transactions directly with the Fund. There are a limited number of institutions that may act as Authorized Participants for the Fund, including on an agency basis on behalf of other market participants. No Authorized Participant is obligated to engage in creation or redemption transactions. To the extent that Authorized Participants exit the business or do not place creation or redemption orders for the Fund and no other Authorized Participant places orders, Fund shares are more likely to trade at a premium or discount to NAV and possibly face trading halts or delisting.
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| iShares Russell 2000 BuyWrite ETF | Concentration Risk [Member] | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | 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 investments are concentrated in the securities or other assets of one or more issuers, countries or other geographic units, markets, industries, project types, or asset classes.
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| iShares Russell 2000 BuyWrite ETF | Cybersecurity Risk [Member] | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | Cybersecurity Risk. Failures or breaches of the electronic systems of the Fund, its adviser, distributor, Index Provider, other service providers, counterparties, or issuers of assets in which the Fund invests may cause disruptions that negatively impact 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. The Fund cannot control the cybersecurity plans and systems of its service providers, counterparties, and other third parties whose activities affect the Fund. In addition, cyber incidents may adversely impact the issuers of securities in which the Fund invests, which may cause such investments to lose value.
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| iShares Russell 2000 BuyWrite ETF | Derivatives Risks [Member] | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | Derivatives Risk. The Fund’s use of derivatives (e.g., futures, forwards, swaps, options) may be riskier than other types of investments and may not have the intended effect on the Fund’s performance. Derivatives can be sensitive to changes in economic and market conditions, and they may increase the Fund’s volatility. The Fund also may experience reduced returns as a result of transaction costs and losses on derivatives positions. There is the risk of imperfect correlation between the value of a derivative and that of the asset underlying the derivative. Derivatives may create investment leverage, which could result in losses that significantly exceed the Fund’s original investment. Derivatives are subject to the risk of mispricing or improper valuation, particularly if there is not a liquid secondary market for the instrument. Certain derivatives are subject to counterparty risk, which is the risk that the other party in the transaction will not fulfill its contractual obligations. The use of derivatives also exposes the Fund to additional operational and legal risks.
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| iShares Russell 2000 BuyWrite ETF | Distribution Tax Risk [Member] | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | Distribution Tax Risk. The Fund currently expects to make distributions on a regular basis. While the Fund will normally pay its income as distributions, the Fund's distributions may exceed the Fund's income and gains for the Fund's taxable year. The Fund may be required to reduce its distributions if it has insufficient income. Distributions in excess of the Fund's current and accumulated earnings and profits will be treated as a return of capital. Distributions in excess of the Fund's minimum distribution requirements, but not in excess of the Fund's earnings and profits, will be taxable to Fund shareholders and will not constitute nontaxable returns of capital. A return of capital distribution generally will not be taxable but will reduce the shareholder's cost basis and will result in a higher capital gain or lower capital loss when those Fund shares on which the distribution was received are sold. Once a Fund shareholder's cost basis is reduced to zero, further distributions will be treated as capital gain, if the Fund shareholder holds shares of the Fund as capital assets. Because the Fund's distributions may consist of return of capital, the Fund may not be an appropriate investment for investors who do not want their principal investment in the Fund to decrease over time or who do not wish to receive return of capital in a given period.
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| iShares Russell 2000 BuyWrite ETF | Equity Securities Risk [Member] | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | Equity Securities Risk. Equity securities are subject to changes in value, and their values may be more volatile than those of other asset classes. The value of a security may decline for a number of reasons that may directly relate to the issuer as well as due to general industry or market conditions. Common stock is subordinated to preferred securities and debt in a company’s capital structure. Common stock has the lowest priority, and the greatest risk, with respect to dividends and any liquidation payments in the event of an issuer’s bankruptcy.
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| iShares Russell 2000 BuyWrite ETF | Financial Companies Risk [Member] | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | Financial Companies Risk. Financial services companies are subject to extensive governmental regulation and intervention, which may adversely affect their profitability, the scope of their activities, the prices they can charge, the amount of capital and liquid assets they must maintain and their size, among other things. Financial services companies also may be significantly affected by, among other things, interest rates, economic conditions, volatility in financial markets, credit rating downgrades, adverse public perception, exposure concentration and counterparty risk.
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| iShares Russell 2000 BuyWrite ETF | Healthcare Companies Risk [Member] | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | Healthcare Companies Risk. The profitability of healthcare companies may be adversely affected by extensive government regulations, restrictions on government reimbursement for medical expenses, rising costs of medical products and services, pricing pressure, the protection and expiration of patents, limited product lines, supply chain issues, labor shortages and product liability claims, among other factors.
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| iShares Russell 2000 BuyWrite ETF | Industrial Companies Risk [Member] | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | Industrial Companies Risk. Industrial companies face a number of risks, including supply chain and distribution disruptions, business interruptions, product obsolescence, third-party vendor risks, cyber attacks, trade disputes, product recalls, liability claims, scarcity of materials or parts, excess capacity, changes in consumer preferences, and volatility in commodity prices and currencies. The performance of such companies may also be affected by technological developments, labor relations, legislative and regulatory changes, government spending policies, and changes in domestic and international economies.
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| iShares Russell 2000 BuyWrite ETF | Investment in Underlying Fund Risk [Member] | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | Investment in Underlying Fund Risk. The Fund invests in the Underlying Fund, so the Fund’s investment performance and risks are likely to be directly related to those of the Underlying Fund. The Fund’s NAV will change with changes in the value of the Underlying Fund and other assets that the Fund holds. The shares of the Underlying Fund may trade at a premium or discount to the Underlying Fund’s NAV. Investors in the Fund will indirectly bear the expenses charged by the Underlying Fund, and an investment in the Fund may entail more expenses than a direct investment in the Underlying Fund.
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| iShares Russell 2000 BuyWrite ETF | Issuer Risk [Member] | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | Issuer Risk. The performance of the Fund depends on the performance of individual securities or other assets to which the Fund has exposure. The value of securities or other assets may decline, or perform differently from the market as a whole, due to changes in the financial condition or credit rating of the issuer or counterparty.
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| iShares Russell 2000 BuyWrite ETF | Large Shareholder and Large Scale Redemption Risk [Member] | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | Large Shareholder and Large-Scale Redemption Risk. Certain shareholders of the Fund, including an Authorized Participant, a third-party investor, the Fund’s adviser, an affiliate of the Fund’s adviser, a market maker, or another entity, may from time to time own or manage a substantial amount of Fund shares, or may hold their investment in the Fund for a limited period of time. There can be no assurance that any large shareholder or large group of shareholders would not redeem their investment. Redemptions of a large number of Fund shares could require the Fund to dispose of assets to meet the redemption requests, which can accelerate the realization of taxable income and/or capital gains and cause the Fund to make taxable distributions to its shareholders earlier than the Fund otherwise would have. In addition, under certain circumstances, non-redeeming shareholders may be treated as receiving a disproportionately large taxable distribution during or with respect to such year. In some circumstances, the Fund may hold a relatively large proportion of its assets in cash in anticipation of large redemptions, diluting its investment returns. These large redemptions may also force the Fund to sell portfolio securities or other assets when it might not otherwise do so, which may negatively impact the Fund’s NAV, increase the Fund’s brokerage costs and/or have a material effect on the market price of Fund shares.
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| iShares Russell 2000 BuyWrite ETF | Management Risk [Member] | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | Management Risk. The Fund generally does not attempt to take defensive positions under any market conditions, including declining markets. As the Fund will not fully replicate the Underlying Index and may hold securities or other assets not included in the Underlying Index, it is subject to the risk that the investment strategy of BFA may not produce the intended results. There is no guarantee that the Fund’s investment results will have a high degree of correlation to those of the Underlying Index or that the Fund will achieve its investment objective.
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| iShares Russell 2000 BuyWrite ETF | Market Trading Risk [Member] | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | Market Trading Risk. The Fund faces numerous market trading risks, including the potential lack of an active market for Fund shares (including through a trading halt), losses from trading in secondary markets, periods of high volatility, and disruptions in the process of creating and redeeming Fund shares. Any of these factors, among others, may lead to the Fund’s shares trading in the secondary market at a premium or discount to NAV or to the intraday value of the Fund’s portfolio holdings. If you buy Fund shares at a time when the market price is at a premium to NAV or sell Fund shares at a time when the market price is at a discount to NAV, you may pay significantly more or receive significantly less than the underlying value of the Fund shares.
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| iShares Russell 2000 BuyWrite ETF | Operational Risk [Member] | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | Operational Risk. The Fund is 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 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.
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| iShares Russell 2000 BuyWrite ETF | Small Fund Risk [Member] | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | Small Fund Risk. When the Fund’s size is small, the Fund may experience low trading volume and wide bid/ask spreads. In addition, the Fund may face the risk of being delisted if it does not meet certain requirements set by the listing exchange. Any resulting liquidation of the Fund could lead to elevated transaction costs for the Fund and negative tax consequences for its shareholders.
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| iShares Russell 2000 BuyWrite ETF | Tax Risk [Member] | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | Tax Risk. The tax rules and limitations that apply to the Fund will cause some or all of its income and gain to be taxable as ordinary income or at ordinary income rates, may accelerate its recognition of income and gain, and may defer its use of losses, all of which are expected to have negative tax consequences for the Fund and Fund investors. The Fund expects that its ownership of shares of the Underlying Fund and sale of call options on the Option Index generally will constitute “straddles” (offsetting positions with respect to personal property) under section 1092 of the Internal Revenue Code (“IRC”). The straddle rules generally do not apply if all the straddle’s offsetting positions consist of “qualified covered call options” (as defined under the IRC) and the stock to be purchased under the options, and the straddle is not part of a larger straddle. Unlike certain other funds that utilize covered call strategies, the Fund does not anticipate that this exception will be available because, as a general matter, the call options it writes are not expected to be treated as “qualified covered call options.” The straddle rules usually will terminate the Fund’s holding periods for its shares of the Underlying Fund that become part of a straddle before the long-term capital gain holding period (more than one year) has been reached, which is expected to eliminate the Fund’s ability to recognize long-term capital gains from a sale or other disposition of such shares. The straddle rules also usually will defer recognition of realized losses and require the capitalization of certain interest expenses and carrying charges. Similarly, “wash sale” rules may apply to defer the recognition of loss by the Fund from the disposition of stock or securities at a loss in a case in which identical or substantially identical stock or securities (or an option to acquire such property) is or has been acquired within a prescribed period. As a result of the foregoing, an investor may be subject to significantly greater amounts of tax as a result of the investment than would apply to an investment in a fund engaged in a different investment strategy.
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| iShares Russell 2000 BuyWrite ETF | Tracking Error Risk [Member] | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | Tracking Error Risk. The Fund may be subject to “tracking error,” which is the divergence of the Fund’s performance from that of the Underlying Index. Tracking error may occur due to a number of factors, including differences between the securities and other assets held in the Fund’s portfolio and those included in the Underlying Index; differences in the timing and methodologies used to value securities and other assets; transaction costs and other expenses incurred by the Fund that the Underlying Index does not incur; the Fund’s holding of uninvested cash; differences in the timing of the accrual or the valuation of dividends or interest received by the Fund or distributions paid to Fund shareholders; tax gains or losses; the requirements for the Fund to maintain pass-through tax treatment; portfolio transactions carried out to minimize the distribution of capital gains to shareholders; the acceptance of custom baskets; changes to the Underlying Index; and impacts to the Fund of complying with certain regulatory requirements or limits. Tracking error risk may be heightened during times of increased market volatility or other unusual market conditions. To the extent that the Fund seeks to achieve its investment objective through investments in the Underlying Fund, the Fund may experience increased tracking error as compared to investing directly in the securities or other assets included in the underlying index of the Underlying Fund. A Fund that tracks an index with exposure to swaps, options, futures and/or other derivatives may experience higher tracking error than ETFs that do not track such indexes. Until the Fund reaches greater scale, it may experience higher tracking error than is typical for similar index ETFs.
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| iShares Russell 2000 BuyWrite ETF | iShares Russell 2000 BuyWrite ETF | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Management Fees | rr_ManagementFeesOverAssets | 0.20% | [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 | 0.19% | [1] | |||
| Total Annual Fund Operating Expenses | rr_ExpensesOverAssets | 0.39% | [1] | |||
| 1 Year | rr_ExpenseExampleYear01 | $ 40 | ||||
| 3 Years | rr_ExpenseExampleYear03 | 125 | ||||
| 5 Years | rr_ExpenseExampleYear05 | 219 | ||||
| 10 Years | rr_ExpenseExampleYear10 | $ 493 | ||||
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