Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	iSHARES TRUST
Prospectus Date	rr_ProspectusDate	Jun. 17, 2013
iSharesBond 2016 Corporate Term ETF
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	iSHARESBOND^TM 2016 CORPORATE TERM ETF Ticker: IBDA Stock Exchange: NYSE Arca
Objective [Heading]	rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The iSharesBond 2016 Corporate Term ETF (the “Fund”) seeks to track the performance, before fees and expenses, of an index that measures the performance of certain U.S. dollar-denominated, investment-grade corporate bonds that mature after March 31, 2015 and before April 1, 2016. The Fund does not seek to return any predetermined amount at maturity or in periodic distributions.
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 interest expenses, taxes, brokerage expenses, future distribution fees or expenses, and extraordinary expenses. The Fund will 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. As the Fund has not commenced operations prior to the date of the Fund’s prospectus (the “Prospectus”), Acquired Fund Fees and Expenses are based on an estimate of the Fund’s allocation to other investment companies for the current fiscal year. The impact of Acquired Fund Fees and Expenses will be 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 will not be included in the calculation of the ratio of expenses to average net assets shown in the Financial Highlights section of the Prospectus. BFA, the investment adviser to the Fund, has contractually agreed to waive its management fees in an amount equal to the Acquired Fund Fees and Expenses attributable to the Fund's investments in other funds advised by BFA or its affiliates through the termination date of the Fund, on or about March 31, 2016. The contractual waiver may be terminated prior to the Fund's termination only upon the 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	March 31, 2016
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	Portfolio Turnover.
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund and the other funds in which the Fund invests (“Underlying Funds”) may pay transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate for the Fund or Underlying Funds may indicate higher transaction costs and cause the Fund or Underlying Funds to incur increased expenses. These expenses, which are not reflected in Annual Fund Operating Expenses or in the Example (except costs to Underlying Funds included as part of Acquired Fund Fees and Expenses), affect the Fund's performance. To the extent an Underlying Fund incurs costs from high portfolio turnover, such costs may have a negative effect on the performance of the Fund.
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:
Acquired Fund Fees and Expenses, Based on Estimates [Text]	rr_AcquiredFundFeesAndExpensesBasedOnEstimates	As the Fund has not commenced operations prior to the date of the Fund’s prospectus (the “Prospectus”), Acquired Fund Fees and Expenses are based on an estimate of the Fund’s allocation to other investment companies for the current fiscal year.
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 will not be included in the calculation of the ratio of expenses to average net assets shown in the Financial Highlights section of 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 its investment objective by investing in the securities of one or more Underlying Funds that themselves seek investment results corresponding to their own underlying indexes and individual securities which satisfy the criteria of the Barclays 2016 Maturity Corporate Index (the “Underlying Index”). The Fund invests in a combination of individual fixed-income securities and Underlying Funds (primarily consisting of other iShares funds) and may also invest in other exchange-traded funds (“ETFs”), U.S. government securities, short-term paper, cash and cash equivalents, including shares of money market funds advised by BFA or its affiliates (“BlackRock Cash Funds”). The Fund is a term fund that will terminate on or about March 31, 2016, at which time it will distribute its remaining net assets to shareholders pursuant to a plan of liquidation. The Underlying Index is composed of U.S. dollar-denominated, taxable, investment-grade corporate bonds scheduled to mature after March 31, 2015 and before April 1, 2016. The Underlying Index includes U.S. dollar-denominated, investment-grade securities publicly issued by U.S. and non-U.S. corporate issuers, that have $250 million or more of outstanding face value at the time of inclusion. The non-U.S. corporate issuers included in the Underlying Index initially will consist primarily of corporate bonds issued by companies domiciled in developed countries. The Fund will invest in non-U.S. issuers to the extent necessary for it to track the Underlying Index. Each bond must be registered with the SEC, have been exempt from registration at issuance, or have been offered pursuant to Rule 144A under the Securities Act of 1933, as amended (“1933 Act”), with registration rights. In addition, to be included in the index, securities that are rated by all three of the rating agencies below must be rated “investment grade” by at least two of the agencies, as defined as Baa3 or higher by Moody’s Investors Service, Inc. (“Moody’s”) or BBB- or higher by Standard & Poor’s Ratings Services or Fitch, Inc. (“Fitch”). When ratings from only two of these agencies are available, the lower rating is used to determine eligibility. Securities with a rating from only one of the three ratings agencies must be rated investment grade or are excluded from the Underlying Index. The Underlying Index is constructed with the following methodology. A parent index, the Barclays U.S. Corporate Index, representing U.S. dollar-denominated, taxable, investment-grade corporate bonds, is stripped of securities maturing outside of the maturity range defined above. Securities are then market-cap weighted within the index, with a 3% cap on any one issuer, and a pro rata distribution of any excess weight across the remaining issuers in the index. The securities in the Underlying Index are updated on the last calendar day of each month until one year prior to March 31, 2016. During this final one year period, the Underlying Index will no longer be updated or rebalanced, except to remove securities which are downgraded below investment grade per the eligibility criteria described above. Additionally, during this period, existing bond weights will be allowed to float based on changes in market value. During the final two years of the Underlying Index, bonds which are screened from the parent index due to being within one year to maturity will be added back into the Underlying Index until such bonds reach maturity. When a bond that is included in the Underlying Index matures, its maturity value will be represented in the Underlying Index by cash throughout the remaining life of the Underlying Index. As the Fund approaches its termination date, its holdings of money market or similar funds may increase, either directly, or through its holdings of the Underlying Funds, causing the Fund to incur the fees and expenses of these funds. By March 31, 2016, the Underlying Index value will be represented almost entirely by cash as no securities will remain in the Underlying Index. As of its inception date, the Fund intends to initially invest in the following Underlying Fund: iSharesBond 2016 Corporate ex-Financials Term ETF. 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 or the Underlying Funds that are affiliated with BFA. “Representative sampling” is an indexing strategy that involves investing in a representative sample of securities that collectively has an investment profile similar to 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 or credit ratings and yield) and liquidity measures similar to those of the Underlying Index. The Fund or an Underlying Fund may or may not hold all of the securities in the Underlying Index. The Fund generally invests at least 80% of its assets in the securities of its Underlying Index through holding shares of one or more Underlying Funds and direct investments in securities, except during the last months of the Fund’s operations (as described below) the Fund's assets will consist of cash and cash equivalents. The Fund may invest the remainder of its assets in cash and cash equivalents (including BlackRock Cash Funds), as well as in bonds not included in the Underlying Index, but which BFA believes will help the Fund track its Underlying Index. In the last months of operation, as the bonds held by the Fund mature, the proceeds will not be reinvested by the Fund in bonds but instead will be held in cash and cash equivalents. By March 31, 2016, the Underlying Index is expected to consist almost entirely of cash earned in this manner. Around the same time, the Fund will wind up and terminate, and its net assets will be distributed to then-current shareholders pursuant to a plan of liquidation. The Fund may lend securities representing up to one-third of the value of the Fund's total assets (including the value of the collateral received). The Underlying Index is sponsored by an organization (the “Index Provider”) that 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. The Fund’s Index Provider is Barclays Capital Inc. (“Barclays Capital”). 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 securities markets or other asset classes. Call Risk. During periods of falling interest rates, an issuer of a callable bond held by the Fund or an Underlying Fund may “call” or repay the security before its stated maturity, and the Fund or an Underlying Fund may have to reinvest the proceeds at lower interest rates, resulting in a decline in the Fund's income. Concentration Risk. To the extent that the Fund's or an Underlying Fund's investments are concentrated in a particular country, group of countries, region, market, industry, group of industries, sector or asset class, the Fund may be susceptible to loss due to adverse occurrences affecting that country, group of countries, region, market, industry, group of industries, sector or asset class. Credit Risk. The Fund is subject to the risk that 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 and the holding of securities by local banks, agents and depositories. Declining Yield Risk. During the twelve months prior to the Fund’s planned termination date, its yield will generally tend to move toward prevailing money market rates, and may be lower than the yields of the bonds previously held by the Fund or an Underlying Fund and lower than prevailing yields for bonds in the market. Financial Sector Risk. Performance of companies in the financial 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. This sector has experienced significant losses in the recent past, and the impact of more stringent capital requirements and of recent or future regulation on any individual financial company or on the sector as a whole cannot be predicted. Fluctuation of Yield and Liquidation Amount Risk. The Fund and the Underlying Funds, unlike a direct investment in a bond that has a level coupon payment and a fixed payment at maturity, will make distributions of income that vary over time. It is expected that an investment in the Fund, if held through maturity, will produce aggregate returns comparable to a direct investment in a group of bonds of similar credit quality and maturity. Unlike a direct investment in bonds, the breakdown of returns between Fund and Underlying Funds distributions and liquidation proceeds are not predictable at the time of your investment. For example, at times during the Fund's existence it may make distributions at a greater (or lesser) rate than the coupon payments received on the Fund's and the Underlying Funds' portfolio, which will result in the Fund and Underlying Fund returning a lesser (or greater) amount on liquidation than would otherwise be the case. The rate of Fund and Underlying Fund distribution payments may adversely affect the tax characterization of your returns from an investment in the Fund relative to a direct investment in bonds. If the amount you receive as liquidation proceeds upon the Fund's termination is higher or lower than your cost basis, you may experience a gain or loss for tax purposes. Income Risk. The Fund's income may decline when interest rates fall. This decline can occur because the Fund or Underlying Funds must invest in lower-yielding instruments as bonds in its portfolio mature, bonds in the Underlying Index are substituted or the Fund otherwise needs to purchase additional bonds. As the Fund does not seek to return any predetermined amount at maturity or in periodic distributions, the amount of income generated by the Fund may vary. In addition, the Fund's income is expected to decline in the months leading up to its maturity date because it will hold primarily cash and cash equivalents. 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 are likely to 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 may occur from time to time and may not be identified and corrected by the Index Provider for a period of time, potentially resulting in an adverse impact on the Fund and its shareholders. Industrials Sector Risk. The industrials sector may be affected by changes in the supply 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 fixed-income securities held by the Fund or an Underlying Fund to decline. Investment in Underlying Funds Risk. The Fund will invest a substantial portion of its assets in one or more Underlying Funds, so the Fund’s investment performance is directly related to the performance of the Underlying Funds. The Fund’s NAV will change with changes in the value of the Underlying Funds and other securities in which the Fund invests. An investment in the Fund will entail more direct and indirect costs and expenses than a direct investment in the Underlying Funds. As the Underlying Funds, or the Fund’s allocations among the Underlying Funds, change from time to time, or to the extent that the expense ratio of any Underlying Fund changes, the weighted average operating expenses borne by the Fund may increase or decrease. The Fund and Underlying Funds are specifically exposed to Management Risk, Market Risk, Market Trading Risk, Passive Investment Risk, Tracking Error Risk and Valuation Risk. Issuer Risk. Fund performance depends on the performance of individual securities to which the Fund or an Underlying 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 or an Underlying 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 management strategy may not produce the intended results. Market Risk. The Fund and Underlying Funds could lose money over short periods due to short-term market movements and over longer periods during 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 disruption in the creation/redemption process of the Fund. ANY OF THESE FACTORS, AMONG OTHERS, MAY LEAD TO THE FUND'S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV. Model Risk. Neither the Fund nor BFA can offer assurances that the Underlying Index's allocation model will maximize returns or minimize risk, or be appropriate for every investor seeking a particular risk profile. Non-Diversification Risk. The Fund or an Underlying 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. Issuers Risk. The Fund or an Underlying Fund may invest in U.S. dollar-denominated bonds of non-U.S. corporations. Securities issued by non-U.S. issuers carry different risks from securities issued by U.S. issuers. These include differences in accounting, auditing and financial reporting standards, the possibility of expropriation or confiscatory taxation, adverse changes in investment or exchange control regulations, political instability, regulatory and economic differences, and potential restrictions on the flow of international capital. North American Economic Risk. The Fund or an Underlying Fund will invest in issuers located in the United States and may invest in issuers located in other North American countries. Economic events in any one North American country can have a significant economic effect on U.S. issuers, and on some or all of the issuers to which the Fund has exposure. Passive Investment Risk. The Fund and Underlying Funds are not actively managed and BFA does not attempt to take defensive positions under any market conditions, including declining markets. Privately-Issued Securities Risk. The Fund or Underlying Funds will invest in privately-issued securities, including those that are normally purchased pursuant to Rule 144A or Regulation S promulgated under the 1933 Act. Privately-issued securities are securities that have not been registered under the 1933 Act and as a result are subject to legal restrictions on resale. Privately-issued securities are not traded on established markets and may be illiquid, difficult to value and subject to wide fluctuations in value. Delay or difficulty in selling such securities may result in a loss to the Fund. Reinvestment Risk. The Fund or an Underlying Fund that invests in short-term fixed-income instruments may be adversely affected if interest rates fall because it may invest in lower yielding bonds as bonds in the portfolio mature. Reliance on Trading Partners Risk. The Fund or an Underlying 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. Securities Lending Risk. The Fund or the Underlying Funds may engage in securities lending. Securities lending involves the risk that the Fund or an Underlying Fund may lose money because the borrower of the Fund's or Underlying Fund's loaned securities fails to return the securities in a timely manner or at all. The Fund or an Underlying 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 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. BFA EXPECTS THAT THE FUND MAY EXPERIENCE HIGHER TRACKING ERROR THAN IS TYPICAL FOR SIMILAR INDEX ETFs. BFA EXPECTS THAT THE FUND MAY EXPERIENCE HIGHER TRACKING ERROR UNTIL THE FUND REACHES SUFFICIENT SCALE AND FURTHER BROADENS ITS HOLDINGS. U.S. Economic Risk. The United States is a significant country in which the Fund or the Underlying Funds invest, and a significant trading partner of countries in which the Fund or the Underlying Funds invest. Certain changes in the U.S. economy may have an adverse effect on countries in which the Fund or the Underlying Funds invest. Utilities Sector Risk. The utilities sector is subject to significant government regulation and oversight. Companies in the utilities sector may be adversely affected due to 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. Valuation Risk. Because the bond market may be open on days when the Fund or an Underlying Fund does not price its shares, the value of the securities in the Fund’s or an Underlying Fund's portfolio may change on days when shareholders will not be able to purchase or sell the Fund’s shares.
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 or an Underlying 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.
iSharesBond 2016 Corporate Term ETF \| iSharesBond 2016 Corporate Term ETF
Risk/Return:	rr_RiskReturnAbstract
Management Fees	rr_ManagementFeesOverAssets	0.10%
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	none
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.03%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.13%
Fee Waiver	rr_FeeWaiverOrReimbursementOverAssets	(0.03%)
Total Annual Fund Operating Expenses After Fee Waiver	rr_NetExpensesOverAssets	0.10%
1 Year	rr_ExpenseExampleYear01	$ 10
3 Years	rr_ExpenseExampleYear03	$ 32

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

iSHARES TRUST

Prospectus Date

rr_ProspectusDate

Jun. 17, 2013

iSharesBond 2016 Corporate Term ETF

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

iSHARESBOND^TM 2016 CORPORATE TERM ETF
Ticker: IBDA Stock Exchange: NYSE Arca

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The iSharesBond 2016 Corporate Term ETF (the “Fund”) seeks to track the performance, before fees and expenses, of an index that measures the performance of certain U.S. dollar-denominated, investment-grade corporate bonds that mature after March 31, 2015 and before April 1, 2016. The Fund does not seek to return any predetermined amount at maturity or in periodic distributions.

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 interest expenses, taxes, brokerage expenses, future distribution fees or expenses, and extraordinary expenses. The Fund will 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. As the Fund has not commenced operations prior to the date of the Fund’s prospectus (the “Prospectus”), Acquired Fund Fees and Expenses are based on an estimate of the Fund’s allocation to other investment companies for the current fiscal year. The impact of Acquired Fund Fees and Expenses will be 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 will not be included in the calculation of the ratio of expenses to average net assets shown in the Financial Highlights section of the Prospectus. BFA, the investment adviser to the Fund, has contractually agreed to waive its management fees in an amount equal to the Acquired Fund Fees and Expenses attributable to the Fund's investments in other funds advised by BFA or its affiliates through the termination date of the Fund, on or about March 31, 2016. The contractual waiver may be terminated prior to the Fund's termination only upon the 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

March 31, 2016

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover.

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund and the other funds in which the Fund invests (“Underlying Funds”) may pay transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate for the Fund or Underlying Funds may indicate higher transaction costs and cause the Fund or Underlying Funds to incur increased expenses. These expenses, which are not reflected in Annual Fund Operating Expenses or in the Example (except costs to Underlying Funds included as part of Acquired Fund Fees and Expenses), affect the Fund's performance. To the extent an Underlying Fund incurs costs from high portfolio turnover, such costs may have a negative effect on the performance of the Fund.

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:

Acquired Fund Fees and Expenses, Based on Estimates [Text]

rr_AcquiredFundFeesAndExpensesBasedOnEstimates

As the Fund has not commenced operations prior to the date of the Fund’s prospectus (the “Prospectus”), Acquired Fund Fees and Expenses are based on an estimate of the Fund’s allocation to other investment companies for the current fiscal year.

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 will not be included in the calculation of the ratio of expenses to average net assets shown in the Financial Highlights section of 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 its investment objective by investing in the securities of one or more Underlying Funds that themselves seek investment results corresponding to their own underlying indexes and individual securities which satisfy the criteria of the Barclays 2016 Maturity Corporate Index (the “Underlying Index”). The Fund invests in a combination of individual fixed-income securities and Underlying Funds (primarily consisting of other iShares funds) and may also invest in other exchange-traded funds (“ETFs”), U.S. government securities, short-term paper, cash and cash equivalents, including shares of money market funds advised by BFA or its affiliates (“BlackRock Cash Funds”).

The Fund is a term fund that will terminate on or about March 31, 2016, at which time it will distribute its remaining net assets to shareholders pursuant to a plan of liquidation. The Underlying Index is composed of U.S. dollar-denominated, taxable, investment-grade corporate bonds scheduled to mature after March 31, 2015 and before April 1, 2016.

The Underlying Index includes U.S. dollar-denominated, investment-grade securities publicly issued by U.S. and non-U.S. corporate issuers, that have $250 million or more of outstanding face value at the time of inclusion. The non-U.S. corporate issuers included in the Underlying Index initially will consist primarily of corporate bonds issued by companies domiciled in developed countries. The Fund will invest in non-U.S. issuers to the extent necessary for it to track the Underlying Index. Each bond must be registered with the SEC, have been exempt from registration at issuance, or have been offered pursuant to Rule 144A under the Securities Act of 1933, as amended (“1933 Act”), with registration rights. In addition, to be included in the index, securities that are rated by all three of the rating agencies below must be rated “investment grade” by at least two of the agencies, as defined as Baa3 or higher by Moody’s Investors Service, Inc. (“Moody’s”) or BBB- or higher by Standard & Poor’s Ratings Services or Fitch, Inc. (“Fitch”). When ratings from only two of these agencies are available, the lower rating is used to determine eligibility. Securities with a rating from only one of the three ratings agencies must be rated investment grade or are excluded from the Underlying Index.

The Underlying Index is constructed with the following methodology. A parent index, the Barclays U.S. Corporate Index, representing U.S. dollar-denominated, taxable, investment-grade corporate bonds, is stripped of securities maturing outside of the maturity range defined above. Securities are then market-cap weighted within the index, with a 3% cap on any one issuer, and a pro rata distribution of any excess weight across the remaining issuers in the index. The securities in the Underlying Index are updated on the last calendar day of each month until one year prior to March 31, 2016. During this final one year period, the Underlying Index will no longer be updated or rebalanced, except to remove securities which are downgraded below investment grade per the eligibility criteria described above. Additionally, during this period, existing bond weights will be allowed to float based on changes in market value. During the final two years of the Underlying Index, bonds which are screened from the parent index due to being within one year to maturity will be added back into the Underlying Index until such bonds reach maturity.

When a bond that is included in the Underlying Index matures, its maturity value will be represented in the Underlying Index by cash throughout the remaining life of the Underlying Index. As the Fund approaches its termination date, its holdings of money market or similar funds may increase, either directly, or through its holdings of the Underlying Funds, causing the Fund to incur the fees and expenses of these funds. By March 31, 2016, the Underlying Index value will be represented almost entirely by cash as no securities will remain in the Underlying Index.

As of its inception date, the Fund intends to initially invest in the following Underlying Fund: iSharesBond 2016 Corporate ex-Financials Term ETF.

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 or the Underlying Funds that are affiliated with BFA. “Representative sampling” is an indexing strategy that involves investing in a representative sample of securities that collectively has an investment profile similar to 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 or credit ratings and yield) and liquidity measures similar to those of the Underlying Index. The Fund or an Underlying Fund may or may not hold all of the securities in the Underlying Index.

The Fund generally invests at least 80% of its assets in the securities of its Underlying Index through holding shares of one or more Underlying Funds and direct investments in securities, except during the last months of the Fund’s operations (as described below) the Fund's assets will consist of cash and cash equivalents. The Fund may invest the remainder of its assets in cash and cash equivalents (including BlackRock Cash Funds), as well as in bonds not included in the Underlying Index, but which BFA believes will help the Fund track its Underlying Index. In the last months of operation, as the bonds held by the Fund mature, the proceeds will not be reinvested by the Fund in bonds but instead will be held in cash and cash equivalents. By March 31, 2016, the Underlying Index is expected to consist almost entirely of cash earned in this manner. Around the same time, the Fund will wind up and terminate, and its net assets will be distributed to then-current shareholders pursuant to a plan of liquidation.

The Fund may lend securities representing up to one-third of the value of the Fund's total assets (including the value of the collateral received).

The Underlying Index is sponsored by an organization (the “Index Provider”) that 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. The Fund’s Index Provider is Barclays Capital Inc. (“Barclays Capital”).

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]

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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]

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Summary of Principal Risks

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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 securities markets or other asset classes.

Call Risk. During periods of falling interest rates, an issuer of a callable bond held by the Fund or an Underlying Fund may “call” or repay the security before its stated maturity, and the Fund or an Underlying Fund may have to reinvest the proceeds at lower interest rates, resulting in a decline in the Fund's income.

Concentration Risk. To the extent that the Fund's or an Underlying Fund's investments are concentrated in a particular country, group of countries, region, market, industry, group of industries, sector or asset class, the Fund may be susceptible to loss due to adverse occurrences affecting that country, group of countries, region, market, industry, group of industries, sector or asset class.

Credit Risk. The Fund is subject to the risk that 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 and the holding of securities by local banks, agents and depositories.

Declining Yield Risk. During the twelve months prior to the Fund’s planned termination date, its yield will generally tend to move toward prevailing money market rates, and may be lower than the yields of the bonds previously held by the Fund or an Underlying Fund and lower than prevailing yields for bonds in the market.

Financial Sector Risk. Performance of companies in the financial 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. This sector has experienced significant losses in the recent past, and the impact of more stringent capital requirements and of recent or future regulation on any individual financial company or on the sector as a whole cannot be predicted.

Fluctuation of Yield and Liquidation Amount Risk. The Fund and the Underlying Funds, unlike a direct investment in a bond that has a level coupon payment and a fixed payment at maturity, will make distributions of income that vary over time. It is expected that an investment in the Fund, if held through maturity, will produce aggregate returns comparable to a direct investment in a group of bonds of similar credit quality and maturity. Unlike a direct investment in bonds, the breakdown of returns between Fund and Underlying Funds distributions and liquidation proceeds are not predictable at the time of your investment. For example, at times during the Fund's existence it may make distributions at a greater (or lesser) rate than the coupon payments received on the Fund's and the Underlying Funds' portfolio, which will result in the Fund and Underlying Fund returning a lesser (or greater) amount on liquidation than would otherwise be the case. The rate of Fund and Underlying Fund distribution payments may adversely affect the tax characterization of your returns from an investment in the Fund relative to a direct investment in bonds. If the amount you receive as liquidation proceeds upon the Fund's termination is higher or lower than your cost basis, you may experience a gain or loss for tax purposes.

Income Risk. The Fund's income may decline when interest rates fall. This decline can occur because the Fund or Underlying Funds must invest in lower-yielding instruments as bonds in its portfolio mature, bonds in the Underlying Index are substituted or the Fund otherwise needs to purchase additional bonds. As the Fund does not seek to return any predetermined amount at maturity or in periodic distributions, the amount of income generated by the Fund may vary. In addition, the Fund's income is expected to decline in the months leading up to its maturity date because it will hold primarily cash and cash equivalents.

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 are likely to 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 may occur from time to time and may not be identified and corrected by the Index Provider for a period of time, potentially resulting in an adverse impact on the Fund and its shareholders.

Industrials Sector Risk. The industrials sector may be affected by changes in the supply 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 fixed-income securities held by the Fund or an Underlying Fund to decline.

Investment in Underlying Funds Risk. The Fund will invest a substantial portion of its assets in one or more Underlying Funds, so the Fund’s investment performance is directly related to the performance of the Underlying Funds. The Fund’s NAV will change with changes in the value of the Underlying Funds and other securities in which the Fund invests. An investment in the Fund will entail more direct and indirect costs and expenses than a direct investment in the Underlying Funds.

As the Underlying Funds, or the Fund’s allocations among the Underlying Funds, change from time to time, or to the extent that the expense ratio of any Underlying Fund changes, the weighted average operating expenses borne by the Fund may increase or decrease.

The Fund and Underlying Funds are specifically exposed to Management Risk, Market Risk, Market Trading Risk, Passive Investment Risk, Tracking Error Risk and Valuation Risk.

Issuer Risk. Fund performance depends on the performance of individual securities to which the Fund or an Underlying 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 or an Underlying 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 management strategy may not produce the intended results.

Market Risk. The Fund and Underlying Funds could lose money over short periods due to short-term market movements and over longer periods during 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 disruption in the creation/redemption process of the Fund. ANY OF THESE FACTORS, AMONG OTHERS, MAY LEAD TO THE FUND'S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV.

Model Risk. Neither the Fund nor BFA can offer assurances that the Underlying Index's allocation model will maximize returns or minimize risk, or be appropriate for every investor seeking a particular risk profile.

Non-Diversification Risk. The Fund or an Underlying 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. Issuers Risk. The Fund or an Underlying Fund may invest in U.S. dollar-denominated bonds of non-U.S. corporations. Securities issued by non-U.S. issuers carry different risks from securities issued by U.S. issuers. These include differences in accounting, auditing and financial reporting standards, the possibility of expropriation or confiscatory taxation, adverse changes in investment or exchange control regulations, political instability, regulatory and economic differences, and potential restrictions on the flow of international capital.

North American Economic Risk. The Fund or an Underlying Fund will invest in issuers located in the United States and may invest in issuers located in other North American countries. Economic events in any one North American country can have a significant economic effect on U.S. issuers, and on some or all of the issuers to which the Fund has exposure.

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

Privately-Issued Securities Risk. The Fund or Underlying Funds will invest in privately-issued securities, including those that are normally purchased pursuant to Rule 144A or Regulation S promulgated under the 1933 Act. Privately-issued securities are securities that have not been registered under the 1933 Act and as a result are subject to legal restrictions on resale. Privately-issued securities are not traded on established markets and may be illiquid, difficult to value and subject to wide fluctuations in value. Delay or difficulty in selling such securities may result in a loss to the Fund.

Reinvestment Risk. The Fund or an Underlying Fund that invests in short-term fixed-income instruments may be adversely affected if interest rates fall because it may invest in lower yielding bonds as bonds in the portfolio mature.

Reliance on Trading Partners Risk. The Fund or an Underlying 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.

Securities Lending Risk. The Fund or the Underlying Funds may engage in securities lending. Securities lending involves the risk that the Fund or an Underlying Fund may lose money because the borrower of the Fund's or Underlying Fund's loaned securities fails to return the securities in a timely manner or at all. The Fund or an Underlying 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 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. BFA EXPECTS THAT THE FUND MAY EXPERIENCE HIGHER TRACKING ERROR THAN IS TYPICAL FOR SIMILAR INDEX ETFs. BFA EXPECTS THAT THE FUND MAY EXPERIENCE HIGHER TRACKING ERROR UNTIL THE FUND REACHES SUFFICIENT SCALE AND FURTHER BROADENS ITS HOLDINGS.

U.S. Economic Risk. The United States is a significant country in which the Fund or the Underlying Funds invest, and a significant trading partner of countries in which the Fund or the Underlying Funds invest. Certain changes in the U.S. economy may have an adverse effect on countries in which the Fund or the Underlying Funds invest.

Utilities Sector Risk. The utilities sector is subject to significant government regulation and oversight. Companies in the utilities sector may be adversely affected due to 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.

Valuation Risk. Because the bond market may be open on days when the Fund or an Underlying Fund does not price its shares, the value of the securities in the Fund’s or an Underlying Fund's portfolio may change on days when shareholders will not be able to purchase or sell the Fund’s shares.

Risk Lose Money [Text]

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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]

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Non-Diversification Risk. The Fund or an Underlying 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]

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Performance Information

Performance Narrative [Text Block]

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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]

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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.

iSharesBond 2016 Corporate Term ETF | iSharesBond 2016 Corporate Term ETF

Risk/Return:

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Management Fees

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0.10%

Distribution and Service (12b-1) Fees

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none

Other Expenses

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none