| Label | Element | Value | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| iShares Yield Optimized Bond ETF | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Risk/Return [Heading] | rr_RiskReturnHeading | iSHARES® YIELD OPTIMIZED BOND ETF Ticker: BYLDStock Exchange: NYSE Arca | |||||||||||||
| Objective [Heading] | rr_ObjectiveHeading | Investment Objective | |||||||||||||
| Objective, Primary [Text Block] | rr_ObjectivePrimaryTextBlock | The iShares Yield Optimized Bond ETF (the “Fund”) seeks to track the investment results of an index composed of underlying fixed income funds that collectively seek to deliver current 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”). BFA, the investment adviser to the Fund, has contractually agreed to waive its management fees through February 28, 2026. The contractual waiver may be terminated prior to February 28, 2026 only upon written agreement of the Trust and BFA. 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 a percentage of the value of your investments)1 | |||||||||||||
| Fee Waiver or Reimbursement over Assets, Date of Termination | rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination | February 28, 2026 | |||||||||||||
| Portfolio Turnover [Heading] | rr_PortfolioTurnoverHeading | Portfolio Turnover. | |||||||||||||
| Portfolio Turnover [Text Block] | rr_PortfolioTurnoverTextBlock | The Fund and the underlying 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 portfolios). A higher portfolio turnover rate for the Fund or Underlying Funds may indicate higher transaction costs and may cause the Fund or the 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. During the most recent fiscal year, the Fund's portfolio turnover rate was 96% of the average value of its portfolio. To the extent the Underlying Funds incur costs from high portfolio turnover, such costs may have a negative effect on the performance of the Fund. | |||||||||||||
| Portfolio Turnover, Rate | rr_PortfolioTurnoverRate | 96.00% | |||||||||||||
| 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 is a fund of funds and seeks to track the investment results of the Morningstar® U.S. Bond Market Yield-Optimized IndexSM (the “Underlying Index”). The Underlying Index consists exclusively of underlying iShares exchange-traded funds (“ETFs”) that themselves seek investment results corresponding to their own underlying indexes. The Fund invests primarily in the Underlying Funds and cash and cash equivalents, including shares of money market funds advised by BFA or its affiliates (“BlackRock Cash Funds”). The Underlying Index is a broadly diversified fixed-income index that seeks to deliver current income while maintaining long-term capital appreciation. The Underlying Index is composed of Underlying Funds within fixed-income sectors that collectively have demonstrated relatively high risk-adjusted income on a consistent basis and meet liquidity characteristics as determined by Morningstar, Inc.’s (“Morningstar” or the “Index Provider”) proprietary index methodology. The goal of the Underlying Index is to represent an allocation to five distinct fixed-income sectors, with the exposure to each sector capped at a specified percentage of the Underlying Index. The five sectors currently included in the Underlying Index, and each sector’s respective current caps, are: between 10% to 50% U.S. government and government-related fixed-income securities, between 10% to 50% U.S. securitized fixed-income securities, between 10% to 50% U.S. investment-grade (as determined by Morningstar) credit securities, no more than 20% U.S. non-investment-grade credit securities and no more than 10% emerging market debt. These five sectors are represented by Underlying Funds that Morningstar considers to deliver higher risk-adjusted yields. Each fixed-income sector has its own return and risk profile. The combined allocation percentages of the five represented sectors will equal 100%. The Underlying Index is rebalanced and reconstituted quarterly. As of October 31, 2024, the Underlying Index included the following Underlying Funds within (i) the U.S. government related sector: iShares 0-3 Month Treasury Bond ETF; (ii) the U.S. securitized sector: iShares CMBS ETF; (iii) the U.S. investment-grade credit sector: iShares 10+ Year Investment Grade Corporate Bond ETF and iShares Floating Rate Bond ETF; (iv) the U.S. non-investment-grade sector: iShares Broad USD High Yield Corporate Bond ETF; and (v) the emerging market debt sector: iShares J.P. Morgan EM High Yield Bond ETF. The Underlying Index may add, eliminate or replace Underlying Funds at reconstitution. The Underlying Index may indirectly include securities issued by sovereign entities. As of October 31, 2024, a significant portion of the Underlying Funds' Underlying Indexes is represented by sovereign and quasi-sovereign obligations. The components of the Underlying Index are likely to change over time. 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. To the extent that BFA uses a representative sampling indexing strategy to manage the 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 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 or each Underlying Fund may or may not hold all of the securities in the applicable Underlying Index. The Fund will invest at least 80% of its assets in the component securities of the Underlying Index and to-be-announced transactions (“TBAs”) that have economic characteristics that are substantially identical to the economic characteristics of the component securities of the Underlying Index, and the Fund will invest at least 90% of its assets in fixed income securities of the types included in the Underlying Index that BFA believes will help the Fund track the Underlying Index. The Fund will invest no more than 10% of its assets in futures, options and swaps contracts that BFA believes will help the Fund track the Underlying Index as well as in fixed income securities other than the types included in the Underlying Index, but which BFA believes will help the Fund track the Underlying Index. Cash and cash equivalent investments associated with a TBA position will be treated as part of that position for purposes of calculating investments in the component securities of the Underlying Index. Cash and cash equivalent investments associated with a derivative position will be treated as part of that position for the purposes of calculating the percentage of investments included in the Underlying Index. The Fund seeks to track the investment results of the Underlying Index before fees and expenses of the Fund. The Fund may lend securities representing up to one-third of the value of the Fund's total assets (including the value of any collateral received). The Underlying Index is sponsored by Morningstar, which is independent of the Fund and BFA. The Index Provider determines the composition and relative weightings of the securities 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 | The performance information below illustrates how the Fund’s performance has varied over different periods and provides some indication of the risks of investing in the Fund. The bar chart shows how the performance of the Fund has varied from one calendar year to another over the periods shown. The table compares the Fund’s performance to that of an appropriate broad-based securities market index and the Underlying Index. Fund returns assume the reinvestment of any dividends and distributions. The Fund’s returns reflect the impact of any agreements to waive or reimburse expenses, which would reduce performance if not in effect. Past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. Updated performance information, including the Fund’s current NAV, may be obtained by visiting www.iShares.com or by calling 1-800-iShares (1-800-474-2737) (toll free).
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| Performance Information Illustrates Variability of Returns [Text] | rr_PerformanceInformationIllustratesVariabilityOfReturns | The performance information below illustrates how the Fund’s performance has varied over different periods and provides some indication of the risks of investing in the Fund. The bar chart shows how the performance of the Fund has varied from one calendar year to another over the periods shown. The table compares the Fund’s performance to that of an appropriate broad-based securities market indexand the Underlying Index. | |||||||||||||
| Performance Availability Phone [Text] | rr_PerformanceAvailabilityPhone | 1-800-iShares (1-800-474-2737) (toll free) | |||||||||||||
| Performance Availability Website Address [Text] | rr_PerformanceAvailabilityWebSiteAddress | www.iShares.com | |||||||||||||
| Performance Past Does Not Indicate Future [Text] | rr_PerformancePastDoesNotIndicateFuture | Past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. | |||||||||||||
| Bar Chart [Heading] | rr_BarChartHeading | Calendar Year-by-Year Returns | |||||||||||||
| Bar Chart Closing [Text Block] | rr_BarChartClosingTextBlock |
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| Performance Table Heading | rr_PerformanceTableHeading | Average Annual Total Returns (for the periods ended December 31, 2024) | |||||||||||||
| Performance Table Uses Highest Federal Rate | rr_PerformanceTableUsesHighestFederalRate | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. | |||||||||||||
| Performance Table Not Relevant to Tax Deferred | rr_PerformanceTableNotRelevantToTaxDeferred | Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to tax-exempt investors or investors who hold shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”). | |||||||||||||
| Performance Table Explanation after Tax Higher | rr_PerformanceTableExplanationAfterTaxHigher | Fund returns after taxes on distributions and sales of Fund shares are calculated assuming that an investor has sufficient capital gains of the same character from other investments to offset any capital losses from the sales of Fund shares. As a result, Fund returns after taxes on distributions and sales of Fund shares may exceed Fund returns before taxes and/or returns after taxes on distributions. | |||||||||||||
| Performance Table Narrative | rr_PerformanceTableNarrativeTextBlock | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to tax-exempt investors or investors who hold shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”). Fund returns after taxes on distributions and sales of Fund shares are calculated assuming that an investor has sufficient capital gains of the same character from other investments to offset any capital losses from the sales of Fund shares. As a result, Fund returns after taxes on distributions and sales of Fund shares may exceed Fund returns before taxes and/or returns after taxes on distributions.
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| iShares Yield Optimized Bond 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 Yield Optimized Bond ETF | Interest Rate Risks [Member] | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Risk [Text Block] | rr_RiskTextBlock | Interest Rate Risk. Interest rate risk refers to the risk of fluctuations in the value of a fixed-income security due to changes in the general level of interest rates. Interest rate changes can be sudden and unpredictable and are influenced by a number of factors, including government policy, monetary policy, inflation expectations, perceptions of risk, and supply and demand for fixed-income securities. An increase in interest rates generally will cause the value of fixed-income securities to decline. Securities with longer maturities generally are more sensitive to interest rate changes and subject to greater fluctuations in value. Changes in interest rates may have unpredictable effects on fixed-income markets and result in heightened volatility and lower liquidity for certain instruments, which may adversely affect a Fund’s performance. During periods of very low or negative interest rates, a Fund may be unable to maintain positive returns or pay dividends to shareholders.
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| iShares Yield Optimized Bond ETF | Credit Risks [Member] | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Risk [Text Block] | rr_RiskTextBlock | 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 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.
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| iShares Yield Optimized Bond 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 Funds, so the Fund’s investment performance and risks are likely to be directly related to those of the Underlying Funds. The Fund’s NAV will change with changes in the value of the Underlying Funds and other assets that the Fund holds. The shares of an 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 Funds, and an investment in the Fund may entail more expenses than a direct investment in the Underlying Funds.
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| iShares Yield Optimized Bond 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 Yield Optimized Bond 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 Yield Optimized Bond ETF | Affiliated Fund Risk [Member] | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Risk [Text Block] | rr_RiskTextBlock | Affiliated Fund Risk. In managing the Fund, BFA has the ability to select Underlying Funds and substitute Underlying Funds with other exchange-traded funds (“ETFs”) that it believes will achieve the Fund’s investment objective. BFA may be subject to 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. Additionally, an Underlying Fund may benefit from being selected in terms of enhanced liquidity and accumulation of assets. 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.
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| iShares Yield Optimized Bond ETF | Allocation Risk [Member] | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Risk [Text Block] | rr_RiskTextBlock | Allocation Risk. The Fund’s ability to achieve its investment objective depends, in part, on the Index Provider’s ability to develop a model that accurately assesses the appropriate asset class allocation for the Fund and selects the best mix of Underlying Funds and other assets. There is no guarantee that these allocation techniques and decisions will produce the desired results for the Fund. There is a risk that the evaluations and assumptions about asset classes or Underlying Funds, which are used as inputs in the model, may be incorrect. This could cause the Fund to be invested, under-invested or not invested in one or more asset classes or Underlying Funds at an inopportune time, which could adversely affect the Fund’s performance.
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| iShares Yield Optimized Bond 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 Yield Optimized Bond 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 Yield Optimized Bond ETF | Call Risk [Member] | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Risk [Text Block] | rr_RiskTextBlock | 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.
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| iShares Yield Optimized Bond 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 Yield Optimized Bond ETF | Currency Risk [Member] | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Risk [Text Block] | rr_RiskTextBlock | Currency Risk. Because the Fund’s NAV is determined in U.S. dollars, the NAV could decline if the currency of the non-U.S. market in which the Fund invests depreciates against the U.S. dollar or if there are delays or limits on the repatriation of foreign 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. In addition, the Fund may incur costs in connection with conversions between U.S. dollars and foreign currencies.
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| iShares Yield Optimized Bond 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 Yield Optimized Bond ETF | Extension Risk [Member] | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Risk [Text Block] | rr_RiskTextBlock | 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 or the Underlying Funds' income and potentially in the value of the Fund’s or an Underlying Fund's investments.
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| iShares Yield Optimized Bond ETF | High Yield Securities Risk [Member] | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Risk [Text Block] | rr_RiskTextBlock | High Yield Securities Risk. Securities that are rated below investment-grade (commonly referred to as “junk bonds,” which may include those bonds rated below “BBB-” by S&P Global Ratings and Fitch Ratings, Inc. (“Fitch”) or below “Baa3” by Moody's Investors Service, Inc. (“Moody's”)), or are unrated, may be deemed speculative, may involve greater levels of risk than higher-rated securities of similar maturity and may be more likely to default.
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| iShares Yield Optimized Bond ETF | Illiquid Investments Risk [Member] | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Risk [Text Block] | rr_RiskTextBlock | Illiquid Investments Risk. An illiquid investment is any investment that the Fund reasonably expects cannot be sold or disposed of in current market conditions in seven calendar days or less without significantly changing the market value of the investment. To the extent the Fund holds illiquid investments, the illiquid investments may reduce its returns because the Fund may be unable to transact at advantageous times or prices. In addition, if the Fund is limited in its ability to sell illiquid investments during periods when shareholders are redeeming their shares, it will need to sell liquid securities to meet redemption requests and illiquid securities will become a larger portion of the Fund’s holdings. During periods of market volatility, liquidity in the market for Fund shares may be impacted by the liquidity in the market for the underlying securities or other assets held by the Fund, which could lead to Fund shares trading at a premium or discount to the Fund’s NAV.
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| iShares Yield Optimized Bond ETF | Income Risk [Member] | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Risk [Text Block] | rr_RiskTextBlock | Income Risk. The Fund's income may decline due to a decline in inflation, deflation or changes in inflation expectations.
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| iShares Yield Optimized Bond 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 Yield Optimized Bond 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 Yield Optimized Bond 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 Yield Optimized Bond ETF | National Closed Market Trading Risk [Member] | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Risk [Text Block] | rr_RiskTextBlock | National Closed Market Trading Risk. To the extent that securities or other assets held by the Fund trade on foreign exchanges or in foreign markets that may be closed when the securities exchange on which the Fund’s shares trade is open, there are likely to be deviations between such asset’s current price and its last quoted price (i.e., the quote from the closed foreign market to the Fund). The impact of a closed foreign market on the Fund is likely to be greater where a large portion of the Fund’s holdings trade on a closed foreign market or when a foreign market is closed for unscheduled reasons. These deviations could result in premiums or discounts to the Fund’s NAV that may be greater than those experienced by other funds.
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| iShares Yield Optimized Bond ETF | Non U S Securities Risk [Member] | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Risk [Text Block] | rr_RiskTextBlock | Non-U.S. Securities Risk. Securities issued by non-U.S. issuers (including depositary receipts) are subject to different legal, regulatory, political, economic, and market risks than securities issued by U.S. issuers. These risks include greater market volatility, less market liquidity, higher transaction costs, expropriation, confiscatory taxation, adverse changes in foreign investment or currency control regulations, restrictions on the repatriation of capital, and political instability. Non-U.S. issuers may be subject to different accounting, audit and financial reporting standards than U.S. issuers, and there may be less publicly available information about non-U.S. issuers. Foreign market trading hours, different clearing and settlement procedures, and holiday schedules may limit the Fund's ability to engage in portfolio transactions. To the extent that investments are made in a limited number of countries, events in those countries will have a more significant impact on the Fund.
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| iShares Yield Optimized Bond 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 Yield Optimized Bond ETF | Privately Issued Securities Risk [Member] | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Risk [Text Block] | rr_RiskTextBlock | Privately Issued Securities Risk. Privately issued securities are securities that have not been registered under the Securities Act of 1933, as amended (the “1933 Act”). Such securities typically are subject to legal restrictions on resale and generally are not traded in established public markets. As a result, privately issued securities may be deemed to be illiquid investments, may be more difficult to value than publicly traded securities, may be subject to wide fluctuations in value and may have higher transaction costs. There can be no assurance that a trading market will exist at any time for any particular privately issued security. Difficulty in selling such securities at a desirable time or price may result in a loss to the Fund.
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| iShares Yield Optimized Bond ETF | Reinvestment Risk [Member] | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Risk [Text Block] | rr_RiskTextBlock | 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 in the Underlying Index are substituted.
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| iShares Yield Optimized Bond ETF | Risk of Investing in China [Member] | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Risk [Text Block] | rr_RiskTextBlock | 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, supply chain diversification, 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. The Underlying Index may include companies that are subject to economic or trade restrictions (but not investment restrictions) imposed by the U.S. or other governments due to national security, human rights or other concerns of such government. So long as these restrictions do not include restrictions on investments, the Fund is generally expected to invest in such companies, consistent with its objective to track the performance of the Underlying Index. 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 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 investors may have limited legal remedies. The Fund does not select investments based on investor protection considerations.
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| iShares Yield Optimized Bond ETF | Risk of Investing in the China Bond Market [Member] | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Risk [Text Block] | rr_RiskTextBlock | Risk of Investing in the China Bond Market. The Fund invests directly in the domestic bond market in the People’s Republic of China (“China” or the “PRC”) (the “China Interbank Bond Market”) through the Bond Connect trading channel. All bonds traded through Bond Connect are registered in the name of the PRC’s Central Moneymarkets Unit (“CMU”), which holds such bonds as a nominee owner. The precise nature and rights of the Fund as the beneficial owner of bonds traded in the China Interbank Bond Market through CMU as nominee are relatively new and untested areas of PRC law, and the exact nature of the Fund’s remedies and methods of enforcement of its rights and interests under PRC law are uncertain. Market volatility and potential lack of liquidity due to low trading volume of certain bonds in the China Interbank Bond Market may result in the prices of certain bonds fluctuating significantly. Also, the systems used to trade through Bond Connect may not function as expected. Trading through Bond Connect is also subject to regulatory risks, including laws and regulations that are subject to change. There can be no assurance that Bond Connect or its features or systems will not be materially altered, suspended, discontinued or abolished. The Fund may be subject to additional taxation if certain tax exemptions under PRC tax regulations are withdrawn or amended. Any taxes arising from or to the Fund may be directly borne by, or indirectly passed on to, the Fund, which may substantially impact its NAV. Investing through Bond Connect subjects the Fund to currency risk, to the extent that currency rates used for Bond Connect are different than the rates used in the China Interbank Bond Market.
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| iShares Yield Optimized Bond ETF | Risk of Investing in Developed Countries [Member] | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Risk [Text Block] | rr_RiskTextBlock | Risk of Investing in Developed Countries. The Fund’s and the Underlying Fund's investment in developed country issuers will 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.
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| iShares Yield Optimized Bond ETF | Risk of Investing in Saudi Arabia [Member] | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Risk [Text Block] | rr_RiskTextBlock | Risk of Investing in Saudi Arabia. Investing in Saudi Arabian issuers subjects the Fund to legal, regulatory, political, currency, security, and economic risks that are specific to Saudi Arabia. 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, which may negatively affect the value of the Fund’s investments. Such heightened risks may include, among others, the 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. Instability in the Middle East region could adversely impact the economy of Saudi Arabia, and there is no assurance of political stability in Saudi Arabia. The ability of foreign investors to invest in the securities of Saudi Arabian companies could be restricted by the Saudi Arabian government at any time, and unforeseen risks could materialize with respect to foreign ownership of such securities. There are a number of ways to conduct transactions in equity securities in the Saudi Arabian market. The Fund generally expects to transact in a manner so that it is not 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, which may have an adverse impact on the prices, quantity or timing of Fund transactions.
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| iShares Yield Optimized Bond 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 Yield Optimized Bond ETF | Securities Lending Risk [Member] | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Risk [Text Block] | rr_RiskTextBlock | Securities Lending Risk. The Fund may engage in securities lending. Securities lending involves the risk that the Fund may lose money because the borrower of the loaned securities fails to return the securities in a timely manner or at all. The Fund 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.
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| iShares Yield Optimized Bond ETF | Sovereign and Quasi Sovereign Obligations Risk [Member] | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Risk [Text Block] | rr_RiskTextBlock | Sovereign and Quasi-Sovereign Obligations Risk. The Fund invest in securities issued by or guaranteed by non-U.S. sovereign governments and by entities affiliated with or backed by non-U.S. sovereign governments, which may be unable or unwilling to repay principal or interest when due. In times of economic uncertainty, the prices of these securities may be more volatile than those of corporate debt obligations or of other government debt obligations.
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| iShares Yield Optimized Bond 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 Funds, the Fund may experience increased tracking error as compared to investing directly in the securities or other assets included in the underlying indexes of the Underlying Funds.
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| iShares Yield Optimized Bond ETF | Valuation Risk [Member] | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Risk [Text Block] | rr_RiskTextBlock | Valuation Risk. The price that the Fund could receive upon the sale (or other disposition) of a security or other asset may differ from the Fund’s valuation of the security or other asset, particularly for securities or other assets that trade in low volume or volatile markets or that are valued using a fair value methodology. The price received by the Fund also may differ from the value used by the Underlying Index. In addition, the value of the securities or other assets in the Fund’s portfolio may change on days or during time periods when investors are not able to purchase or sell Fund shares. Authorized Participants that create or redeem Fund shares on days when the Fund is holding fair-valued securities or other assets may receive fewer or more shares, or lower or higher redemption proceeds, than they would have received had the securities or other assets 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.
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| iShares Yield Optimized Bond ETF | iShares Yield Optimized Bond ETF | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Management Fees | rr_ManagementFeesOverAssets | 0.28% | [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 | 0.17% | [1] | ||||||||||||
| Total Annual Fund Operating Expenses | rr_ExpensesOverAssets | 0.45% | [1] | ||||||||||||
| Fee Waiver | rr_FeeWaiverOrReimbursementOverAssets | (0.28%) | [1] | ||||||||||||
| Total Annual Fund Operating Expenses After Fee Waiver | rr_NetExpensesOverAssets | 0.17% | [1] | ||||||||||||
| 1 Year | rr_ExpenseExampleYear01 | $ 17 | |||||||||||||
| 3 Years | rr_ExpenseExampleYear03 | 116 | |||||||||||||
| 5 Years | rr_ExpenseExampleYear05 | 224 | |||||||||||||
| 10 Years | rr_ExpenseExampleYear10 | $ 540 | |||||||||||||
| 2015 | rr_AnnualReturn2015 | (0.96%) | |||||||||||||
| 2016 | rr_AnnualReturn2016 | 5.27% | |||||||||||||
| 2017 | rr_AnnualReturn2017 | 4.92% | |||||||||||||
| 2018 | rr_AnnualReturn2018 | (1.36%) | |||||||||||||
| 2019 | rr_AnnualReturn2019 | 12.62% | |||||||||||||
| 2020 | rr_AnnualReturn2020 | 4.22% | |||||||||||||
| 2021 | rr_AnnualReturn2021 | (1.06%) | |||||||||||||
| 2022 | rr_AnnualReturn2022 | (10.41%) | |||||||||||||
| 2023 | rr_AnnualReturn2023 | 8.19% | |||||||||||||
| 2024 | rr_AnnualReturn2024 | 4.32% | |||||||||||||
| Highest Quarterly Return, Label | rr_HighestQuarterlyReturnLabel | Best Quarter | |||||||||||||
| Highest Quarterly Return, Date | rr_BarChartHighestQuarterlyReturnDate | Dec. 31, 2023 | |||||||||||||
| Highest Quarterly Return | rr_BarChartHighestQuarterlyReturn | 6.54% | |||||||||||||
| Lowest Quarterly Return, Label | rr_LowestQuarterlyReturnLabel | Worst Quarter | |||||||||||||
| Lowest Quarterly Return, Date | rr_BarChartLowestQuarterlyReturnDate | Jun. 30, 2022 | |||||||||||||
| Lowest Quarterly Return | rr_BarChartLowestQuarterlyReturn | (5.50%) | |||||||||||||
| One Year | rr_AverageAnnualReturnYear01 | 4.32% | |||||||||||||
| Five Years | rr_AverageAnnualReturnYear05 | 0.84% | |||||||||||||
| Ten Years | rr_AverageAnnualReturnYear10 | 2.39% | |||||||||||||
| Inception Date | rr_AverageAnnualReturnInceptionDate | Apr. 22, 2014 | |||||||||||||
| iShares Yield Optimized Bond ETF | Return After Taxes on Distributions | iShares Yield Optimized Bond ETF | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| One Year | rr_AverageAnnualReturnYear01 | 2.10% | |||||||||||||
| Five Years | rr_AverageAnnualReturnYear05 | (0.69%) | |||||||||||||
| Ten Years | rr_AverageAnnualReturnYear10 | 0.87% | |||||||||||||
| iShares Yield Optimized Bond ETF | Return After Taxes on Distributions and Sale of Fund Shares | iShares Yield Optimized Bond ETF | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| One Year | rr_AverageAnnualReturnYear01 | 2.53% | |||||||||||||
| Five Years | rr_AverageAnnualReturnYear05 | (0.01%) | |||||||||||||
| Ten Years | rr_AverageAnnualReturnYear10 | 1.16% | |||||||||||||
| iShares Yield Optimized Bond ETF | Bloomberg U.S. Universal Index (Returns do not reflect deductions for fees, expenses or taxes) | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| One Year | rr_AverageAnnualReturnYear01 | 2.04% | [3] | ||||||||||||
| Five Years | rr_AverageAnnualReturnYear05 | 0.06% | [3] | ||||||||||||
| Ten Years | rr_AverageAnnualReturnYear10 | 1.73% | [3] | ||||||||||||
| iShares Yield Optimized Bond ETF | Morningstar U.S. Bond Market Yield-Optimized Index (Returns do not reflect deductions for fees, expenses or taxes) | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| One Year | rr_AverageAnnualReturnYear01 | 4.29% | |||||||||||||
| Five Years | rr_AverageAnnualReturnYear05 | 0.68% | |||||||||||||
| Ten Years | rr_AverageAnnualReturnYear10 | 2.25% | |||||||||||||
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