Label		Element	Value
Risk/Return:		rr_RiskReturnAbstract
Registrant Name		dei_EntityRegistrantName	iSHARES TRUST
Prospectus Date		rr_ProspectusDate	Jul. 01, 2015
iShares 1-3 Year Treasury Bond ETF
Risk/Return:		rr_RiskReturnAbstract
Risk/Return [Heading]		rr_RiskReturnHeading	iSHARES® 1-3 YEAR TREASURY BOND ETF Ticker: SHY                                 Stock Exchange: NYSE Arca
Objective [Heading]		rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]		rr_ObjectivePrimaryTextBlock	The iShares 1-3 Year Treasury Bond ETF (the “Fund”) seeks to track the investment results of an index composed of U.S. Treasury bonds with remaining maturities between one and three years.
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”) (formerly, Barclays Global Fund Advisors (“BGFA”)) (the “Investment Advisory Agreement”) provides that BFA will pay all operating expenses of the Fund, except interest expenses, taxes, brokerage expenses, future distribution fees or expenses, and extraordinary expenses. You may also incur usual and customary brokerage commissions 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 122% of the average value of its portfolio.
Portfolio Turnover, Rate		rr_PortfolioTurnoverRate	122.00%
Expense Exchange Traded Fund Commissions [Text]		rr_ExpenseExchangeTradedFundCommissions	You may also incur usual and customary brokerage commissions 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 Barclays U.S. 1-3 Year Treasury Bond Index (the “Underlying Index”), which measures the performance of public obligations of the U.S. Treasury that have a remaining maturity of greater than or equal to one year and less than three years. As of December 31, 2014, there were 96 issues in the Underlying Index. The Underlying Index includes all publicly-issued U.S. Treasury securities that have a remaining maturity of greater than or equal to one year and less than three years, are rated investment-grade, and have $250 million or more of outstanding face value. In addition, the securities in the Underlying Index must be denominated in U.S. dollars and must be fixed-rate and non-convertible. Excluded from the Underlying Index are certain special issues such as targeted investor notes, state and local government series bonds and coupon issues that have been stripped from bonds. The Underlying Index is market capitalization-weighted and the securities in the Underlying Index are updated on the last business day of each month. 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 the 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, duration, maturity, credit ratings and yield) and liquidity measures similar to those of the Underlying Index. The Fund may or may not hold all of the securities in the Underlying Index. The Fund generally invests at least 90% of its assets in the bonds of the Underlying Index and at least 95% of its assets in U.S. government bonds. The Fund may invest up to 10% of its assets in U.S. government bonds not included in the Underlying Index, but which BFA believes will help the Fund track the Underlying Index. The Fund also may invest up to 5% of its assets in repurchase agreements collateralized by U.S. government obligations and in cash and cash equivalents, including shares of money market funds advised by BFA or its affiliates. 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 Barclays Capital Inc. or its affiliates (the “Index Provider” or “Barclays”), 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), repurchase agreements collateralized by U.S. government securities, and securities of state or municipal governments and their political subdivisions 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), repurchase agreements collateralized by U.S. government securities, and securities of state or municipal governments and their political subdivisions 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 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. Asset Class Risk. Securities in the Underlying Index or in the Fund's portfolio may underperform in comparison to the general financial markets, a particular securities market or other asset classes. 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. Income Risk. The Fund's income may decline when interest rates fall. This decline can occur because the Fund may subsequently invest in lower-yielding bonds when bonds in its portfolio mature, bonds in the Underlying Index are substituted or the Fund otherwise needs to purchase additional bonds. Index-Related Risk. There is no guarantee that the Fund will achieve a high degree of correlation to the Underlying Index and 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. Interest Rate Risk. An increase in interest rates may cause the value of securities held by the Fund to decline. Issuer Risk. Fund performance depends on the performance of individual securities to which the Fund has exposure. Changes to the financial condition or credit rating of an issuer of those securities may cause the value of the securities to decline. 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 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. Passive Investment Risk. The Fund is not actively managed and BFA does not attempt to take defensive positions under any market conditions, including declining markets. Risk of Investing in the United States. The Fund has significant exposure to U.S. issuers. Certain changes in the U.S. economy, such as when the U.S. economy weakens or when its financial markets decline, may have an adverse effect on the securities to which the Fund has exposure. 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 the 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. Tracking Error Risk. Tracking error is the divergence of the Fund’s performance from that of the Underlying Index. Tracking error may occur because of differences between the securities held in the Fund’s portfolio and those included in the Underlying Index, pricing differences, transaction costs, the Fund’s holding of uninvested cash, differences in timing of the accrual of distributions, changes to the Underlying Index or the need to meet 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 the Fund incurs fees and expenses, while the Underlying Index does not. U.S. Treasury Obligations Risk. U.S. Treasury obligations may differ from other securities in their interest rates, maturities, times of issuance and other characteristics and may provide relatively lower returns than those of other securities. Similar to other issuers, changes to the financial condition or credit rating of the U.S. government may cause the value of the Fund's U.S. Treasury obligations to decline.
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.
Bar Chart and Performance Table [Heading]		rr_BarChartAndPerformanceTableHeading	Performance Information
Performance Narrative [Text Block]		rr_PerformanceNarrativeTextBlock	The bar chart and table that follow show how the Fund has performed on a calendar year basis and provide an indication of the risks of investing in the Fund. Both assume that all dividends and distributions have been reinvested in the Fund. Past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. Supplemental information about the Fund’s performance is shown under the heading Total Return Information in the Supplemental Information section of the Fund's prospectus (the “Prospectus”).
Performance Information Illustrates Variability of Returns [Text]		rr_PerformanceInformationIllustratesVariabilityOfReturns	The bar chart and table that follow show how the Fund has performed on a calendar year basis and provide an indication of the risks of investing in the Fund.
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	Year by Year Returns (Years Ended December 31)
Bar Chart Closing [Text Block]		rr_BarChartClosingTextBlock	The best calendar quarter return during the periods shown above was 3.09% in the 1st quarter of 2008; the worst was -0.97% in the 2nd quarter of 2008. Updated performance information is available at www.iShares.com or by calling 1-800-iShares (1-800-474-2737) (toll free).
Performance Table Heading		rr_PerformanceTableHeading	Average Annual Total Returns (for the periods ended December 31, 2014)
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 sale 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.
iShares 1-3 Year Treasury Bond ETF | iShares 1-3 Year Treasury Bond ETF
Risk/Return:		rr_RiskReturnAbstract
Management Fees		rr_ManagementFeesOverAssets	0.15%
Distribution and Service (12b-1) Fees		rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses		rr_OtherExpensesOverAssets	none
Total Annual Fund Operating Expenses		rr_ExpensesOverAssets	0.15%
1 Year		rr_ExpenseExampleYear01	$ 15
3 Years		rr_ExpenseExampleYear03	48
5 Years		rr_ExpenseExampleYear05	85
10 Years		rr_ExpenseExampleYear10	$ 192
2005		rr_AnnualReturn2005	1.48%
2006		rr_AnnualReturn2006	3.84%
2007		rr_AnnualReturn2007	7.30%
2008		rr_AnnualReturn2008	6.64%
2009		rr_AnnualReturn2009	0.54%
2010		rr_AnnualReturn2010	2.22%
2011		rr_AnnualReturn2011	1.43%
2012		rr_AnnualReturn2012	0.31%
2013		rr_AnnualReturn2013	0.23%
2014	[1]	rr_AnnualReturn2014	0.48%
Year to Date Return, Label		rr_YearToDateReturnLabel	The Fund’s year-to-date return
Bar Chart, Year to Date Return, Date		rr_BarChartYearToDateReturnDate	Mar. 31, 2015
Bar Chart, Year to Date Return		rr_BarChartYearToDateReturn	0.51%
Highest Quarterly Return, Label		rr_HighestQuarterlyReturnLabel	best
Highest Quarterly Return, Date		rr_BarChartHighestQuarterlyReturnDate	Mar. 31, 2008
Highest Quarterly Return		rr_BarChartHighestQuarterlyReturn	3.09%
Lowest Quarterly Return, Label		rr_LowestQuarterlyReturnLabel	worst
Lowest Quarterly Return, Date		rr_BarChartLowestQuarterlyReturnDate	Jun. 30, 2008
Lowest Quarterly Return		rr_BarChartLowestQuarterlyReturn	(0.97%)
One Year		rr_AverageAnnualReturnYear01	0.48%
Five Years		rr_AverageAnnualReturnYear05	0.93%
Ten Years		rr_AverageAnnualReturnYear10	2.42%
Inception Date		rr_AverageAnnualReturnInceptionDate	Jul. 22, 2002
iShares 1-3 Year Treasury Bond ETF | Return After Taxes on Distributions | iShares 1-3 Year Treasury Bond ETF
Risk/Return:		rr_RiskReturnAbstract
One Year	[2]	rr_AverageAnnualReturnYear01	0.32%
Five Years	[2]	rr_AverageAnnualReturnYear05	0.72%
Ten Years	[2]	rr_AverageAnnualReturnYear10	1.70%
iShares 1-3 Year Treasury Bond ETF | Return After Taxes on Distributions and Sale of Fund Shares | iShares 1-3 Year Treasury Bond ETF
Risk/Return:		rr_RiskReturnAbstract
One Year	[2]	rr_AverageAnnualReturnYear01	0.27%
Five Years	[2]	rr_AverageAnnualReturnYear05	0.64%
Ten Years	[2]	rr_AverageAnnualReturnYear10	1.62%
iShares 1-3 Year Treasury Bond ETF | Barclays U.S. 1-3 Year Treasury Bond Index (Index returns do not reflect deductions for fees, expenses, or taxes)
Risk/Return:		rr_RiskReturnAbstract
One Year		rr_AverageAnnualReturnYear01	0.63%
Five Years		rr_AverageAnnualReturnYear05	1.07%
Ten Years		rr_AverageAnnualReturnYear10	2.54%

[1] The Fund's year-to-date return as of March 31, 2015 was 0.51%.

[2] 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 sale 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.