Label		Element	Value
Risk/Return:		rr_RiskReturnAbstract
Registrant Name		dei_EntityRegistrantName	iSHARES TRUST
Prospectus Date		rr_ProspectusDate	Jul. 01, 2015
iShares Core U.S. Aggregate Bond ETF
Risk/Return:		rr_RiskReturnAbstract
Risk/Return [Heading]		rr_RiskReturnHeading	iSHARES® CORE U.S. AGGREGATE BOND ETF Ticker: AGG                                 Stock Exchange: NYSE Arca
Objective [Heading]		rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]		rr_ObjectivePrimaryTextBlock	The iShares Core U.S. Aggregate Bond ETF (the “Fund”) seeks to track the investment results of an index composed of the total U.S. investment-grade bond market.
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. The Fund may also pay Acquired Fund Fees and Expenses. “Acquired Fund Fees and Expenses” reflect the Fund's pro rata share of the fees and expenses incurred by investing in other investment companies. The impact of Acquired Fund Fees and Expenses is included in the total returns of the Fund. Acquired Fund Fees and Expenses are not used to calculate the Fund's net asset value per share (“NAV”) and are not included in the calculation of the ratio of expenses to average net assets shown in the Financial Highlights section of the Fund's prospectus (the “Prospectus”). BFA, the investment adviser to the Fund, has contractually agreed to waive a portion of its management fees in an amount equal to the Acquired Fund Fees and Expenses, if any, attributable to the Fund's investments in other registered investment companies advised by BFA, or its affiliates through June 30, 2016. The contractual waiver may be terminated prior to June 30, 2016 only upon written agreement of the Trust and BFA. 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)
Fee Waiver or Reimbursement over Assets, Date of Termination		rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	June 30, 2016
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 318% of the average value of its portfolio.
Portfolio Turnover, Rate		rr_PortfolioTurnoverRate	318.00%
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:
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]		rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees	Acquired Fund Fees and Expenses are not used to calculate the Fund's net asset value per share (“NAV”) and are not included in the calculation of the ratio of expenses to average net assets shown in the Financial Highlights section of the Fund's prospectus (the “Prospectus”).
Expense Example [Heading]		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. Aggregate Bond Index (the “Underlying Index”), which measures the performance of the total U.S. investment-grade bond market. As of December 31, 2014, there were 9,079 issues in the Underlying Index. The Underlying Index includes investment-grade U.S. Treasury bonds, government-related bonds, corporate bonds, mortgage-backed pass-through securities, commercial mortgage-backed securities and asset-backed securities that are publicly offered for sale in the United States. The Underlying Index may include large-, mid- or small-capitalization companies. Components of the Underlying Index primarily include mortgage-backed pass-through and treasury securities, and financials and industrials companies. The components of the Underlying Index, and the degree to which these components represent certain industries, may change over time. The securities in the Underlying Index have $250 million or more of outstanding face value and have at least one year remaining to maturity, with the exception of amortizing securities such as asset-backed and mortgage-backed securities, which have lower thresholds as defined by the index provider. In addition, the securities in the Underlying Index must be denominated in U.S. dollars and must be fixed-rate and non-convertible. Certain types of securities, such as state and local government series bonds, structured notes with embedded swaps or other special features, private placements, floating-rate securities and Eurobonds are excluded from the Underlying Index. 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. 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 seeks to track the performance of the Underlying Index by investing approximately 90% of its assets in the bonds represented in the Underlying Index and in securities that provide substantially similar exposure to securities in the Underlying Index. The Fund may invest the remainder of its assets in bonds not included in the Underlying Index, but which BFA believes will help the Fund track the Underlying Index, as well as in cash and high-quality, liquid short-term instruments, 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. As of December 31, 2014, approximately 28.44% of the bonds represented in the Underlying Index were U.S. fixed-rate agency mortgage-backed pass-through securities. U.S. fixed-rate agency mortgage-backed pass-through securities are securities issued by entities such as the Government National Mortgage Association (“GNMA” or “Ginnie Mae”), the Federal National Mortgage Association (“FNMA” or “Fannie Mae”), and the Federal Home Loan Mortgage Corporation (“FHLMC” or “Freddie Mac”) that are backed by pools of mortgages. Most transactions in fixed-rate mortgage-backed pass-through securities occur through standardized contracts for future delivery in which the exact mortgage pools to be delivered are not specified until a few days prior to settlement (“to-be-announced (TBA) transactions”). The Fund may enter into such contracts on a regular basis. The Fund, pending settlement of such contracts, will invest its assets in high-quality, liquid short-term instruments, including shares of money market funds advised by BFA or its affiliates. The Fund will assume its pro rata share of the fees and expenses of any money market fund that it may invest in, in addition to the Fund's own fees and expenses. The Fund may also acquire interests in mortgage pools through means other than such standardized contracts for future delivery. 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 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. Call Risk. During periods of falling interest rates, an issuer of a callable bond held by the Fund may “call” or repay the security before its stated maturity, and the Fund may have to reinvest the proceeds at lower interest rates, resulting in a decline in the Fund's income. 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. Credit Risk. Debt issuers and other counterparties may not honor their obligations or may have their debt downgraded by ratings agencies. Custody Risk. Less developed 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. Extension Risk. During periods of rising interest rates, certain debt obligations may be paid off substantially more slowly than originally anticipated and the value of those securities may fall sharply, resulting in a decline in the Fund’s income and potentially in the value of the Fund’s investments. Financials Sector Risk. Performance of companies in the financials sector may be adversely impacted by many factors, including, among others, government regulations, economic conditions, credit rating downgrades, changes in interest rates, and decreased liquidity in credit markets. The impact of more stringent capital requirements, recent or future regulation on any individual financial company, or recent or future regulation on the financials sector as a whole cannot be predicted. Geographic Risk. A natural or other disaster could occur in a geographic region in which the Fund invests. High Portfolio Turnover Risk. The Fund may engage in active and frequent trading of its portfolio securities. High portfolio turnover (higher than 100%) may result in increased transaction costs to the Fund, including brokerage commissions, dealer mark-ups and other transaction costs on the sale of the securities and on reinvestment in other securities. 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. Industrials Sector Risk. The industrials sector may be affected by changes in the supply of and demand for products and services, product obsolescence, claims for environmental damage or product liability and general economic conditions, among other factors. 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 in the financial condition or credit rating of an issuer of those securities may cause the value of the securities to decline. Liquidity Risk. Liquidity risk exists when particular investments are difficult to purchase or sell. This can reduce the Fund's returns because the Fund may be unable to transact at advantageous times or prices. 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. Mortgage-Backed Securities Risk. The Fund invests in mortgage-backed securities, some of which may not be backed by the full faith and credit of the U.S. government. Mortgage-backed securities are subject to prepayment risk and extension risk. Because of these risks, mortgage-backed securities react differently than other bonds to changes in interest rates. Small movements in interest rates (both increases and decreases) may quickly and significantly reduce the value of certain mortgage-backed securities. Default or bankruptcy of a counterparty to a TBA transaction would expose the Fund to possible loss. North American Economic Risk. Economic events in any one North American country can have a significant economic effect on the entire North American region and on some or all of the North American countries in which the Fund invests. 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. Prepayment Risk. During periods of falling interest rates, an issuer of mortgages and other fixed-income securities may be able to repay principal prior to the security’s maturity, causing the Fund to have to reinvest in securities with a lower yield or higher risk of default, resulting in a decline in the Fund’s income or return potential. Reliance on Trading Partners Risk. The Fund invests in countries whose economies are heavily dependent upon trading with key partners. Any reduction in this trading may have an adverse impact on the Fund's investments. 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 Prospectus. If BFA had not waived certain Fund fees during certain periods, the Fund's returns would have been lower.
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 5.21% in the 4th quarter of 2008; the worst was -2.42% in the 2nd quarter of 2013. 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 Core U.S. Aggregate Bond ETF | iShares Core U.S. Aggregate Bond ETF
Risk/Return:		rr_RiskReturnAbstract
Management Fees		rr_ManagementFeesOverAssets	0.08%
Distribution and Service (12b-1) Fees		rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses		rr_OtherExpensesOverAssets	none
Acquired Fund Fees and Expenses		rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total Annual Fund Operating Expenses		rr_ExpensesOverAssets	0.09%
Fee Waiver		rr_FeeWaiverOrReimbursementOverAssets	(0.01%)
Total Annual Fund Operating Expenses After Fee Waiver		rr_NetExpensesOverAssets	0.08%
1 Year		rr_ExpenseExampleYear01	$ 8
3 Years		rr_ExpenseExampleYear03	28
5 Years		rr_ExpenseExampleYear05	50
10 Years		rr_ExpenseExampleYear10	$ 114
2005		rr_AnnualReturn2005	2.17%
2006		rr_AnnualReturn2006	4.14%
2007		rr_AnnualReturn2007	6.57%
2008		rr_AnnualReturn2008	5.90%
2009		rr_AnnualReturn2009	5.13%
2010		rr_AnnualReturn2010	6.28%
2011		rr_AnnualReturn2011	7.58%
2012		rr_AnnualReturn2012	4.04%
2013		rr_AnnualReturn2013	(2.15%)
2014	[1]	rr_AnnualReturn2014	6.04%
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	1.63%
Highest Quarterly Return, Label		rr_HighestQuarterlyReturnLabel	best
Highest Quarterly Return, Date		rr_BarChartHighestQuarterlyReturnDate	Dec. 31, 2008
Highest Quarterly Return		rr_BarChartHighestQuarterlyReturn	5.21%
Lowest Quarterly Return, Label		rr_LowestQuarterlyReturnLabel	worst
Lowest Quarterly Return, Date		rr_BarChartLowestQuarterlyReturnDate	Jun. 30, 2013
Lowest Quarterly Return		rr_BarChartLowestQuarterlyReturn	(2.42%)
One Year		rr_AverageAnnualReturnYear01	6.04%
Five Years		rr_AverageAnnualReturnYear05	4.30%
Ten Years		rr_AverageAnnualReturnYear10	4.53%
Inception Date		rr_AverageAnnualReturnInceptionDate	Sep. 22, 2003
iShares Core U.S. Aggregate Bond ETF | Return After Taxes on Distributions | iShares Core U.S. Aggregate Bond ETF
Risk/Return:		rr_RiskReturnAbstract
One Year	[2]	rr_AverageAnnualReturnYear01	4.93%
Five Years	[2]	rr_AverageAnnualReturnYear05	3.17%
Ten Years	[2]	rr_AverageAnnualReturnYear10	3.16%
iShares Core U.S. Aggregate Bond ETF | Return After Taxes on Distributions and Sale of Fund Shares | iShares Core U.S. Aggregate Bond ETF
Risk/Return:		rr_RiskReturnAbstract
One Year	[2]	rr_AverageAnnualReturnYear01	3.40%
Five Years	[2]	rr_AverageAnnualReturnYear05	2.88%
Ten Years	[2]	rr_AverageAnnualReturnYear10	2.99%
iShares Core U.S. Aggregate Bond ETF | Barclays U.S. Aggregate Bond Index (Index returns do not reflect deductions for fees, expenses, or taxes)
Risk/Return:		rr_RiskReturnAbstract
One Year		rr_AverageAnnualReturnYear01	5.97%
Five Years		rr_AverageAnnualReturnYear05	4.45%
Ten Years		rr_AverageAnnualReturnYear10	4.71%

[1] The Fund's year-to-date return as of March 31, 2015 was 1.63%.

[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.