Label		Element	Value
Risk/Return:		rr_RiskReturnAbstract
Registrant Name		dei_EntityRegistrantName	iSHARES TRUST
Prospectus Date		rr_ProspectusDate	Jul. 01, 2015
iShares California AMT-Free Muni Bond ETF
Risk/Return:		rr_RiskReturnAbstract
Risk/Return [Heading]		rr_RiskReturnHeading	iSHARES® CALIFORNIA AMT-FREE MUNI BOND ETF Ticker: CMF                                 Stock Exchange: NYSE Arca
Objective [Heading]		rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]		rr_ObjectivePrimaryTextBlock	The iShares California AMT-Free Muni Bond ETF (the “Fund”) seeks to track the investment results of an index composed of investment-grade municipal bonds issued in the State of California.
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 6% of the average value of its portfolio.
Portfolio Turnover, Rate		rr_PortfolioTurnoverRate	6.00%
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 S&P California AMT-Free Municipal Bond IndexTM (the “Underlying Index”), which measures the performance of the investment-grade segment of the California municipal bond market. As of December 31, 2014, there were 1,845 issues in the Underlying Index. Components primarily include transportation and utilities companies. The components of the Underlying Index, and the degree to which these components represent certain industries, may change over time. The Underlying Index is a subset of the S&P National AMT-Free Municipal Bond IndexTM and is comprised of municipal bonds issued in the State of California. The Underlying Index includes municipal bonds from issuers in the State of California that are California state or local governments or agencies whose interest payments are exempt from U.S. federal and California state income taxes and the federal alternative minimum tax (“AMT”). Each bond must have a rating of at least BBB- by Standard & Poor's Ratings Services, Baa3 by Moody’s Investors Service, Inc. (“Moody's”), or BBB- by Fitch Ratings, Inc. (“Fitch”). A bond must be rated by at least one of the three rating agencies in order to qualify for the Underlying Index. For the avoidance of doubt, the lowest rating will be used in determining if the bond is investment-grade. Each bond must be denominated in U.S. dollars. Each bond in the Underlying Index must be a constituent of an offering where the original offering amount was at least $100 million. The bond must have a minimum par amount of $25 million to be eligible for inclusion. To remain in the Underlying Index, bonds must maintain a minimum par amount greater than or equal to $25 million as of the next rebalancing date. In addition, each bond must have a minimum term to maturity and/or pre-refunded or call date greater than or equal to one calendar month to be included in the Underlying Index. The Underlying Index is a market-value weighted index, and the securities in the Underlying Index are updated after the close 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 will invest at least 90% of its assets in the component 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 (“BlackRock Cash Funds”), as well as in securities not included in the Underlying Index, but which BFA believes will help the Fund track the Underlying Index. From time to time when conditions warrant, however, the Fund may invest at least 80% of its assets in the component securities of the Underlying Index and may invest up to 20% of its assets in certain futures, options and swap contracts, cash and cash equivalents, including shares of BlackRock Cash Funds, 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 generally holds municipal bond securities issued by the State of California and its municipalities whose interest payments are exempt from U.S. federal and California state income tax, the federal AMT and the federal Medicare contribution tax of 3.8% on “net investment income.” In addition, the Fund intends to invest any cash assets in one or more municipal money market funds, which may be 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 a product of S&P Dow Jones Indices LLC (the “Index Provider” or “SPDJI”), 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. California Municipal Securities Risk. Because the Fund invests substantially in California municipal instruments, it is more exposed to the impact of negative political, economic and statutory factors within the State of California than a fund that invests more widely. 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. 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. 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 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. The Fund invests a significant portion of its portfolio in municipal securities, which may be less liquid than comparable taxable bonds. 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. The recent financial crisis caused a decrease in the value and liquidity of many securities, including certain municipal securities, and adversely affected many issuers of municipal securities and may continue to do so. 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. Municipal Securities Risk. Municipal securities can be significantly affected by political or economic changes as well as uncertainties in the municipal market related to taxation, legislative changes or the rights of municipal security holders. Municipal securities backed by current or anticipated revenues from a specific project or specific assets can be negatively affected by the inability to collect revenues for the project or from the assets. 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. 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. Tax Risk. There is no guarantee that the Fund's income will be exempt from U.S. federal income taxes, the federal AMT or the federal Medicare contribution tax of 3.8% on “net investment income.” 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, or as a result of certain features of index construction that pose challenges in light of tax and regulatory considerations. Tracking error also may result because the Fund incurs fees and expenses, while the Underlying Index does not. Transportation Industry Group Risk. The transportation industry group may be adversely affected by economic changes, fuel prices, labor relations, insurance costs and government regulations. Utilities Sector Risk. The utilities sector is subject to significant government regulation and oversight, and may be adversely affected by increases in fuel and operating costs, rising costs of financing capital construction and the cost of complying with U.S. federal and state regulations, among other factors.
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	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 8.29% in the 3rd quarter of 2009; the worst was -5.66% in the 4th quarter of 2010. 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 California AMT-Free Muni Bond ETF | iShares California AMT-Free Muni Bond ETF
Risk/Return:		rr_RiskReturnAbstract
Management Fees		rr_ManagementFeesOverAssets	0.25%
Distribution and Service (12b-1) Fees		rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses		rr_OtherExpensesOverAssets	none
Total Annual Fund Operating Expenses		rr_ExpensesOverAssets	0.25%
1 Year		rr_ExpenseExampleYear01	$ 26
3 Years		rr_ExpenseExampleYear03	80
5 Years		rr_ExpenseExampleYear05	141
10 Years		rr_ExpenseExampleYear10	$ 318
2008		rr_AnnualReturn2008	(1.42%)
2009		rr_AnnualReturn2009	10.19%
2010		rr_AnnualReturn2010	1.53%
2011		rr_AnnualReturn2011	11.88%
2012		rr_AnnualReturn2012	7.73%
2013		rr_AnnualReturn2013	(1.93%)
2014	[1]	rr_AnnualReturn2014	9.99%
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	0.98%
Highest Quarterly Return, Label		rr_HighestQuarterlyReturnLabel	best
Highest Quarterly Return, Date		rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return		rr_BarChartHighestQuarterlyReturn	8.29%
Lowest Quarterly Return, Label		rr_LowestQuarterlyReturnLabel	worst
Lowest Quarterly Return, Date		rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2010
Lowest Quarterly Return		rr_BarChartLowestQuarterlyReturn	(5.66%)
One Year		rr_AverageAnnualReturnYear01	9.99%
Five Years		rr_AverageAnnualReturnYear05	5.71%
Since Fund Inception		rr_AverageAnnualReturnSinceInception	5.29%
Inception Date		rr_AverageAnnualReturnInceptionDate	Oct. 04, 2007
iShares California AMT-Free Muni Bond ETF | Return After Taxes on Distributions | iShares California AMT-Free Muni Bond ETF
Risk/Return:		rr_RiskReturnAbstract
One Year	[2]	rr_AverageAnnualReturnYear01	9.99%
Five Years	[2]	rr_AverageAnnualReturnYear05	5.70%
Since Fund Inception	[2]	rr_AverageAnnualReturnSinceInception	5.29%
iShares California AMT-Free Muni Bond ETF | Return After Taxes on Distributions and Sale of Fund Shares | iShares California AMT-Free Muni Bond ETF
Risk/Return:		rr_RiskReturnAbstract
One Year	[2]	rr_AverageAnnualReturnYear01	6.97%
Five Years	[2]	rr_AverageAnnualReturnYear05	5.21%
Since Fund Inception	[2]	rr_AverageAnnualReturnSinceInception	4.91%
iShares California AMT-Free Muni Bond ETF | S&P California AMT-Free Municipal Bond Index™ (Index returns do not reflect deductions for fees, expenses, or taxes)
Risk/Return:		rr_RiskReturnAbstract
One Year		rr_AverageAnnualReturnYear01	10.21%
Five Years		rr_AverageAnnualReturnYear05	6.14%
Since Fund Inception		rr_AverageAnnualReturnSinceInception	5.31%

[1] The Fund's year-to-date return as of March 31, 2015 was 0.98%.

[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.