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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName iSHARES TRUST
Prospectus Date rr_ProspectusDate Dec. 01, 2017
iShares MSCI China A ETF  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading iSHARES® MSCI CHINA A ETF
Ticker: CNYA                                 Stock Exchange: Cboe BZX
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The iShares MSCI China A ETF (the “Fund”) seeks to track the investment results of an index composed of domestic Chinese equities that trade on the Shanghai or Shenzhen Stock Exchange.
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 own 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 the management fees, interest expenses, taxes, expenses incurred with respect to the acquisition and disposition of portfolio securities and the execution of portfolio transactions, including brokerage commissions, distribution fees or expenses, litigation expenses and any extraordinary expenses.

You may also incur usual and customary brokerage commissions and other charges when buying or selling shares of the Fund, which are not reflected in the Example that follows:
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)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover.
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund may pay transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 13% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 13.00%
Expense Exchange Traded Fund Commissions [Text] rr_ExpenseExchangeTradedFundCommissions You may also incur usual and customary brokerage commissions and other charges when buying or selling shares of the Fund, which are not reflected in the Example that follows:
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 MSCI China A International Index (the “Underlying Index”), which is designed to measure equity market performance in the China A-shares market. China A-shares are equity securities of companies based in mainland China that trade on Chinese stock exchanges such as the Shanghai Stock Exchange and the Shenzhen Stock Exchange (“A-shares”). Foreign investment in A-shares is permitted principally through regulations in the People's Republic of China (“China” or the “PRC”) known as the Qualified Foreign Institutional Investor (“QFII”) and Renminbi Qualified Foreign Institutional Investor (“RQFII”) systems.

The Underlying Index applies eligibility criteria for the MSCI Global Investable Market Indexes (“GIMI”), along with MSCI’s investability and minimum size criteria for emerging markets. The Underlying Index is weighted by each issuer’s free float-adjusted market capitalization available to foreign investors and may include large- or mid-capitalization companies. As of July 31, 2017, a significant portion of the Underlying Index is represented by securities of financials and industrials companies. The components of the Underlying Index, and the degree to which these components represent certain industries, are likely to change over time.

A QFII or RQFII license is obtained by submitting an application to the China Securities Regulatory Commission. Once the license is obtained, the QFII or RQFII must also submit an application to China’s State Administration of Foreign Exchange (“SAFE”) for a specific aggregate dollar amount investment quota in which the QFII or RQFII can invest in A-shares. U.S. domiciled investment companies (such as the Fund) or investment managers (such as BFA) are not currently among the types of eligible entities that may apply for a QFII or RQFII license directly. Therefore, the Fund intends to invest directly in A-shares under the quota granted by SAFE to BFA's affiliate, BlackRock Advisors (UK) Limited (“BAUL”). BAUL has obtained an RQFII license and has been granted a RQFII quota, which BAUL will use to facilitate investment of the Fund’s assets in A-shares. As the RQFII-licensed entity, BAUL will oversee and manage on a day-to-day basis the usage of the quota granted to BAUL. The Fund’s investments in A-shares will be limited by the quota allocated to BAUL with respect to the Fund and certain other affiliated funds. If BAUL uses its entire RQFII quota with respect to the Fund and certain other affiliated funds, BAUL may, subject to applicable regulations, apply for an increase in its RQFII quota. While the Fund seeks to invest in A-shares, the Fund occasionally may invest in other assets if it is not possible to acquire A-shares.

BFA uses a “passive” or indexing approach to try to achieve the Fund’s investment objective. Unlike many investment companies, 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 keeping portfolio turnover low in comparison to actively managed investment companies.

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 capitalization and industry weightings), fundamental characteristics (such as return variability and yield) and liquidity measures similar to those of an applicable underlying index. The Fund may or may not hold all of the securities in the Underlying Index.

The Fund generally will invest at least 90% of its assets in the component securities of the Underlying Index and in investments that have economic characteristics that are substantially identical to the component securities of the Underlying Index (i.e., depositary receipts representing securities of the Underlying Index) and may invest up to 10% of its assets in certain futures, options and swap contracts, cash and cash equivalents, including shares of money market funds advised by BFA or its affiliates, as well as in securities not included in the Underlying Index, but which BFA believes will help the Fund track the Underlying Index. The Fund seeks to track the investment results of the Underlying Index before fees and expenses of the Fund.

The Underlying Index is sponsored by MSCI Inc. (the “Index Provider” or “MSCI”), 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.
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
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock 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. The Fund is subject to certain risks, including the principal risks noted below, any of which may adversely affect the Fund's net asset value per share (“NAV”), trading price, yield, total return and ability to meet its investment objective.

A-Share Market Suspension Risk. The A-shares market has a higher propensity for trading suspensions than many other global equity markets. Trading suspensions in certain stocks could lead to greater market execution risk and costs for the Fund, and the creation and redemption of Creation Units (as defined below) may also be disrupted.

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

Assets Under Management (AUM) Risk. From time to time, an Authorized Participant (as defined in the Creations and Redemptions section of this prospectus (the “Prospectus”)), a third-party investor, the Fund’s adviser or an affiliate of the Fund’s adviser, or a fund may invest in the Fund and hold its investment for a specific period of time in order to facilitate commencement of the Fund’s operations or 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.

Authorized Participant Concentration Risk. Only an Authorized Participant may engage in creation or redemption transactions directly with the Fund. The Fund has a limited number of institutions that may act as Authorized Participants on an agency basis (i.e., on behalf of other market participants). To the extent that Authorized Participants exit the business or are unable to proceed with creation and/or redemption orders with respect to the Fund and no other Authorized Participant is able to step forward to create or redeem Creation Units (as defined in the Purchase and Sale of Fund Shares section of the Prospectus), Fund shares may be more likely to trade at a premium or discount to NAV and possibly face trading halts and/or delisting. Authorized Participant concentration risk may be heightened for exchange-traded funds (“ETFs”), such as the Fund, that invest in non-U.S. securities or other securities or instruments that have lower trading volumes.

Cash Transactions Risk. The Fund expects to effect all of its creations and redemptions for cash, rather than in-kind securities. As a result, the Fund may have to sell portfolio securities at inopportune times in order to obtain the cash needed to meet redemption orders. This may cause the Fund to sell a security and recognize a capital gain or loss that might not have been incurred if it had made a redemption in-kind. In addition to selling securities, the Fund will generally have to convert renminbi received for such securities to U.S. dollars in connection with payment of redemption proceeds, which will result in additional transaction costs and potential losses. The use of cash creations and redemptions may also cause the Fund’s shares to trade in the market at wider bid-ask spreads or greater premiums or discounts to the Fund’s NAV.

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 of a particular issuer or issuers, country, group of countries, region, market, industry, group of industries, sector or asset class.

Currency Risk. The Fund’s assets will be invested primarily in domestic Chinese equities and the income received by the Fund will be primarily in renminbi (“RMB”). Because the Fund’s NAV is determined on the basis of the U.S. dollar, investors may lose money if the RMB depreciates against the U.S. dollar, even if the local currency values of the Fund’s holdings in Chinese securities increase. Furthermore, the Fund may incur costs in connection with conversions between U.S. dollars and RMB, as well as in connection with conversions between the two separate types of RMB, the onshore RMB (“CNY”) and the offshore RMB (“CNH”). The Fund does not intend to hedge its currency exposure.

Transactions with Authorized Participants will be in CNH, but the Fund must transact in A-shares using CNY. CNY and CNH are traded in separate markets that operate independently, may trade at different rates and may not move in the same direction. The CNY exchange rate will be used for purposes of determining the Fund’s NAV and for the valuation of the securities in the Underlying Index. To the extent that the CNY exchange rate differs from the CNH exchange rate, the Fund’s NAV and its ability to track the Underlying Index may be adversely impacted.

In addition, there is no assurance that there will always be sufficient amounts of RMB available for the Fund to remain fully invested in Chinese equities. The Chinese government heavily regulates the domestic exchange of foreign currencies and RMB exchange rates in China, which may adversely affect the operations and financial results of the Fund’s investments in China.

Custody Risk. Less developed securities markets are more likely to experience problems with the clearing and settling of trades, as well as the holding of securities by local banks, agents and depositories. Investors should note that cash deposited in the cash account of the Fund with the RQFII custodian will not be segregated, but will be a debt owing from the RQFII custodian to the Fund as a depositor. Such cash will be commingled with cash belonging to other clients of the RQFII custodian. In the event of bankruptcy or liquidation of the RQFII custodian, the Fund will not have any proprietary rights to the cash deposited in such cash account, and the Fund will become an unsecured creditor, ranking pari passu with all other unsecured creditors of the RQFII custodian. The Fund may face difficulty and/or encounter delays in recovering such debt, or may not be able to recover it in full or at all, in which case the Fund will suffer losses.

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

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 Underlying Index is comprised of common stocks, which generally subject their holders to more risks than holders of preferred stocks and debt securities because common stockholders’ claims are subordinated to those of holders of preferred stock and debt securities upon the bankruptcy of the issuer.

Financials Sector Risk. Performance of companies in the financials sector may be adversely impacted by many factors, including, among others, changes in government regulations, economic conditions, and interest rates, credit rating downgrades, and decreased liquidity in credit markets. Chinese financials sector regulation and ownership may be more intrusive than in the U.S. and other developed countries, especially with respect to the regulation of non-Chinese banks and other non-Chinese financial companies. Greater Chinese governmental involvement in the financials sector may pose additional risks for investors. Market conditions in China may be particularly subject to change based on government policy. The impact of more stringent capital requirements and recent or future regulation of any individual financial company, or of the financials sector as a whole, cannot be predicted. In recent years, cyber attacks and technology malfunctions and failures have become increasingly frequent in this sector and have caused significant losses to companies in this sector, which may negatively impact the Fund.

Geographic Risk. A natural or man-made disaster could occur in China. China is located in a part of the world that has historically been prone to natural disasters such as floods, droughts, earthquakes, typhoons or tsunamis, and is economically sensitive to environmental events. Any such event may adversely impact China's economy and the value of the securities in the Fund.

Index-Related Risk. There is no guarantee that the Fund’s investment results will have a high degree of correlation to those of the Underlying Index and that the Fund will therefore achieve its investment objective. Market disruptions and regulatory restrictions could have an adverse effect on the Fund’s ability to adjust its exposure to the required levels in order to track the Underlying Index. Errors in index data, index computations or the construction of the Underlying Index in accordance with its methodology may occur from time to time and may not be identified and corrected by the Index Provider for a period of time or at all, which may have an adverse impact on the Fund and its shareholders.

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

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

Large-Capitalization Companies Risk. Large-capitalization companies may be less able than smaller capitalization companies to adapt to changing market conditions. Large-capitalization companies may be more mature and subject to more limited growth potential compared with smaller capitalization companies. During different market cycles, the performance of large-capitalization companies has trailed the overall performance of the broader securities markets.

Management Risk. As the Fund may not fully replicate the Underlying Index, it is subject to the risk that BFA's investment strategy may not produce the intended results.

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.

Market Timing Risk. The Fund is subject to the risk that an Authorized Participant may create or redeem shares of the Fund at a net asset value that does not take into account events subsequent to the local China market close and therefore may not appropriately reflect the intrinsic value of the Fund’s assets.

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

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

Nationalization Risk. Investments in China may be subject to loss due to expropriation or nationalization of assets and property or the imposition of restrictions on foreign investments and repatriation of capital.

Non-Diversification Risk. The Fund may invest a large percentage of its assets in securities issued by or representing a small number of issuers. As a result, the Fund's performance may depend on the performance of a small number of issuers.

Non-U.S. Securities Risk. Investments in Chinese issuers are subject to the risks associated with investing in China, such as heightened risks of inflation or nationalization. The Fund may lose money due to political, economic and geographic events affecting issuers of Chinese securities or Chinese markets. In addition, non-U.S. securities markets may trade a small number of securities and may be unable to respond effectively to increases in trading volume, potentially making prompt liquidation of holdings difficult or impossible at times. The Fund is specifically exposed to Asian Economic Risk.

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 these risks.

Passive Investment Risk. The Fund is not actively managed, and BFA generally does not attempt to take defensive positions under any market conditions, including declining markets.

PRC Broker Risk. RQFII regulations permit foreign investors to designate no more than three PRC brokers per exchange to execute transactions. However, as a matter of practice, it is likely that only one PRC broker will be appointed with respect to each exchange in the PRC (which may be the same broker) as a result of the PRC regulatory requirement that securities be sold through the same PRC broker through which the securities were originally purchased. Limitations on the number of PRC brokers may impact the Fund’s ability to achieve best execution on its trades of A-shares. The limited number of PRC brokers may also make the Fund more susceptible to credit loss or trading disruption in the event of a default or business disruption by one or more of the Fund’s designated PRC brokers. Should the Fund’s ability to use one or more of the relevant PRC brokers be affected for any reason, this could disrupt the operations of the Fund and affect the ability of the Fund to track the Underlying Index and/or cause the Fund’s shares to trade at a premium or discount to NAV. The Fund may also incur losses due to the acts or omissions of the PRC brokers in the execution or settlement of any transaction or in the transfer of any funds or securities. In addition, the RQFII regulations that limit the number of brokers the Fund can use to execute transactions may result in higher tracking error than if the Fund was not limited in the number of brokers it could use.

Pre-Funding and Associated Risks. A-shares can only be purchased on a pre-funded basis, whereby the Fund must deliver an estimated RMB amount (“the Pre-Funding Amount”) to cover purchases before trade executions may take place. In the event that the Pre-Funding Amount is not delivered by the deadline established with the Fund’s custodian, or if the Pre-Funding Amount is insufficient to purchase all the underlying securities in connection with the creation transaction, the Fund would not be able to acquire all the requisite underlying securities during the initial purchase. In this situation, additional RMB would have to be delivered to the Fund’s onshore custody account to enable additional purchases on subsequent days. Delayed trade executions could result in higher tracking error.

Privatization Risk. China has privatized, or has begun the process of privatizing, certain entities and industries. Privatized entities may lose money or be re-nationalized.

Reliance on Trading Partners Risk. The Fund invests in a country whose economy is heavily dependent upon trading with key partners. Any reduction in this trading may have an adverse impact on the Fund's investments. Through its portfolio companies' trading partners, the Fund is specifically exposed to Asian Economic Risk, European Economic Risk and U.S. Economic Risk.

Risk of Investing in China. Investment in Chinese securities subjects the Fund 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. Internal social unrest or confrontations with other 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. Incidents involving China's or the region's security may cause uncertainty in Chinese markets and may adversely affect the Chinese economy and the Fund's investments. Export growth continues to be a major driver of China's rapid economic growth. Reduction in spending on Chinese products and services, institution of tariffs or other trade barriers, or a downturn in any of the economies of China's key trading partners may have an adverse impact on the Chinese economy.

Risk of Investing in Emerging Markets. The Fund's investments in China may be subject to a greater risk of loss than investments in issuers located or operating in more developed markets. Emerging markets may be more likely to experience inflation, political turmoil and rapid changes in economic conditions than more developed markets. Emerging markets often have less uniformity in accounting and reporting requirements, less reliable securities valuations and greater risk associated with custody of securities than developed markets.

Special Risk Considerations Relating to the RQFII Regime and Investments in A-Shares. The Fund’s ability to achieve its investment objective depends on the ability of BAUL, as the Fund’s RQFII license holder, to obtain sufficient quota allocation for the Fund to fully invest in the constituent securities of the Underlying Index. The Fund will not have exclusive use of a specified amount of RQFII quota and will rely on BAUL’s allocation procedure pursuant to which quota will generally be allocated among funds on a first-come, first-served basis. If BAUL’s RQFII quota is insufficient to meet investor demand for Fund shares, BFA may invest a portion of the Fund’s assets in securities not included in the Underlying Index or in derivatives, which may increase the Fund’s tracking error. If the Fund is unable to invest in a manner consistent with its investment objective and tracking risk tolerance, BFA may reject new creation orders for Fund shares. Rejection of new creation orders could cause the Fund’s shares to trade in the secondary market at a higher than usual premium or discount to NAV.

The RQFII regulations and market infrastructure are relatively new and have not been tested through multiple business cycles or market events and there is a risk that the PRC regulators may discontinue the RQFII regime and other avenues for foreign investment in A-shares. Although RQFII license holders may apply for additional quota when they are nearing full capacity utilization, there is no guarantee that PRC regulators will approve the quota request in a timely manner or at all. Any change in the RQFII system generally, including the possibility of BAUL, as the Fund’s RQFII license holder, losing its RQFII status may affect the Fund’s ability to invest in A-shares directly through BAUL’s RQFII license.

Tax Risk. Withholding tax, as a technical matter, is legally applicable to capital gains realized by foreign investors on the disposal of A-shares under the PRC Corporate Income Tax (“CIT”); however, before the release of Caishui (“Circular”) 79 by the PRC tax authorities, the PRC tax authorities had not in practice been reported to have sought to collect such withholding tax on capital gains realized by foreign investors on the disposal of A-shares. Under Circular 79, which was released by the PRC tax authorities on November 14, 2014, capital gains realized on or after November 17, 2014 by QFIIs and RQFIIs from the disposal of A-shares, including PRC “land-rich” companies (i.e., companies that have derived more than 50% of their value from immovable property located in the PRC at any time in the three years prior to the disposal) are temporarily exempt from Chinese taxation. The duration of the exemption is not stated in Circular 79 and it is subject to termination by the PRC tax authorities with or without notice. If the exemption is withdrawn or modified, there is a risk that the PRC tax authorities may seek to collect tax on capital gains realized on the Fund’s investments in A-shares or other Chinese investments. If the temporary exemption is withdrawn, the Fund would be subject to PRC taxation in respect of gains on A-shares and the resultant tax liability would adversely affect the Fund’s NAV.

Tracking Error Risk. Tracking error is the divergence of a fund’s performance from that of the applicable underlying index. Tracking error may occur because of differences between the securities and other instruments held in a fund’s portfolio and those included in the applicable underlying index, pricing differences (including, as applicable, differences between a security’s price at the local market close and the fund's valuation of a security at the time of calculation of the fund's NAV), differences in transaction costs, the fund’s holding of uninvested cash, differences in timing of the accrual of or the valuation of dividends or interest, tax gains or losses, changes to the applicable underlying index or the costs to the fund of complying with various new or existing regulatory requirements. This risk may be heightened during times of increased market volatility or other unusual market conditions. Tracking error also may result because a fund incurs fees and expenses, while the applicable underlying index does not. INDEX ETFS THAT TRACK INDICES WITH SIGNIFICANT WEIGHT IN EMERGING MARKETS ISSUERS MAY EXPERIENCE HIGHER TRACKING ERROR THAN OTHER INDEX ETFS THAT DO NOT TRACK SUCH INDICES.

Valuation Risk. The sale price the Fund could receive for a security or other asset may differ from the Fund's valuation of the security or other asset and from the value used by the Underlying Index, particularly for securities or other assets that trade in low volume or volatile markets or that are valued using a fair value methodology as a result of trade suspensions or for other reasons. In addition, the value of the securities or other assets in the Fund's portfolio may change on days or during time periods when shareholders will not be able to purchase or sell the Fund's shares. Authorized Participants who purchase or redeem  Fund shares on days when the Fund is holding fair-valued securities may receive fewer or more shares or lower or higher redemption proceeds than they would have received had the Fund not fair-valued securities or used a different valuation methodology. The Fund’s ability to value investments may be impacted by technological issues and/or errors by pricing services or other third-party service providers.
Risk Lose Money [Text] rr_RiskLoseMoney 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.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus Non-Diversification Risk. The Fund may invest a large percentage of its assets in securities issued by or representing a small number of issuers. As a result, the Fund's performance may depend on the performance of a small number of issuers.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock As of the date of the Prospectus, the Fund has been in operation for less than one full calendar year and therefore does not report its performance information.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess As of the date of the Prospectus, the Fund has been in operation for less than one full calendar year and therefore does not report its performance information.
iShares MSCI China A ETF | iShares MSCI China A ETF  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.65%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets none [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.65%
1 Year rr_ExpenseExampleYear01 $ 66
3 Years rr_ExpenseExampleYear03 208
5 Years rr_ExpenseExampleYear05 362
10 Years rr_ExpenseExampleYear10 $ 810
[1] For the most recently completed fiscal year, the amount of Other Expenses rounded to 0.00%.