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    <oef:RiskReturnHeading
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      id="t_18_cbc005c2_964d_f56a_b597_1fe6546a130b"> iShares U.S. Power Infrastructure ETF  POWR | NYSE Arca </oef:RiskReturnHeading>
    <oef:ObjectiveHeading
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      id="t_1_d18eb5e9_ee65_4138_86f5_53547bb1c42a">  Investment Objective  </oef:ObjectiveHeading>
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      id="t_2_5d1a2cf2_bd76_4c9c_b35e_61909aca2ad2"> &lt;div style="margin-top: 6pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;The iShares U.S. Power Infrastructure ETF (the &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Fund&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;) seeks to track the investment results of an index composed of public &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;companies involved in U.S. power infrastructure.&lt;/span&gt;&lt;/div&gt; </oef:ObjectivePrimaryTextBlock>
    <oef:ExpenseHeading
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      id="t_3_43acd1ad_77d3_4580_8436_e2b753a063d1">  Fees and Expenses  </oef:ExpenseHeading>
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      id="t_4_b5a167af_97cc_4d9f_9989_7eb5f14e9237"> &lt;div style="margin-top: 6pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;The following table describes the fees and expenses that you will incur if you buy, hold and sell shares of the Fund. Amounts &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;in the table are rounded to the nearest basis point, which in some cases may be &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;0.00.&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt; line-height: 11pt;"&gt;&#x2009;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt; The investment advisory agreement &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;between iShares, Inc. (the &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Company&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;) and BlackRock Fund Advisors (&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;BFA&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;) (the &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Investment Advisory Agreement&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;) provides &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;that BFA will pay all operating expenses of the Fund, except: (i) the management fees, (ii) interest expenses, (iii) taxes, &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;(iv) expenses incurred with respect to the acquisition and disposition of portfolio securities and the execution of portfolio &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;transactions, including brokerage commissions, (v) distribution fees or expenses, and (vi) litigation expenses and any &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;extraordinary expenses.&lt;/span&gt;&lt;/div&gt;  &lt;div style="margin-top: 7pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt; line-height: 11pt;"&gt;&#160;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt; font-weight: bold;"&gt;You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt; font-weight: bold;"&gt;reflected in the table and example below.&lt;/span&gt;&lt;/div&gt; </oef:ExpenseNarrativeTextBlock>
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      id="t_64_8b054819_69fe_eadd_88e0_d4b4d9a83776">Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)1,2</oef:OperatingExpensesCaption>
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    <oef:ExpenseExampleHeading
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      id="t_21_87242424_907c_d094_a11a_c7bcfba67661">This Example is intended to help you compare the cost of owning shares of the Fund with the cost of investing inother funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then sell all of yourshares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that theFund&#x2019;s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions,your costs would be:</oef:ExpenseExampleNarrativeTextBlock>
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    <oef:PortfolioTurnoverHeading
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      id="t_23_a0a422e7_61b4_caff_7d9d_3c5d9ef59a8f">The Fund may pay transaction costs, such as commissions, when it buys and sells securities (or&#x201c;turnsover&#x201d;its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes whenFund shares are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or inthe Example, affect the Fund&#x2019;s performance. The Fund has changed its fiscal year end from August 31 to March 31. Duringthe most recent fiscal year ended March 31, 2026, the Fund's portfolio turnover rate was 90% of the average value of itsportfolio.</oef:PortfolioTurnoverTextBlock>
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    <oef:StrategyHeading
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      id="t_7_679e4bbf_c829_451b_a196_d522152a938c"> Principal Investment Strategies </oef:StrategyHeading>
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      id="t_8_3463c816_edd7_4bbe_9e7f_7bd487289857">  &lt;div style="margin-top: 6pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;The Fund seeks to track the investment results of the S&amp;amp;P U.S. Power Infrastructure Select Index (the &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Underlying Index&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;), &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;which measures the performance of equity securities of U.S.-domiciled companies involved in U.S. power infrastructure, as &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;determined by S&amp;amp;P Dow Jones Indices LLC (the &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Index Provider&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt; or &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;SPDJI&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;). The Index Provider constructs the Underlying &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Index by including those companies within the S&amp;amp;P 1500 Composite Index (the &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Parent Index&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;) that derive at least 50% of &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;their total revenue from U.S. power infrastructure-related businesses, excluding certain oil &amp;amp; gas companies not involved in &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;natural gas, as defined by FactSet&#x2019;s Revere Business Industry Classification System (&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;RBICS&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;).&lt;/span&gt;&lt;/div&gt;   &lt;div style="margin-top: 6pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;The U.S. power infrastructure-related businesses include the following sub-themes: (i) energy supply for electrification &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;(ii) power generation, and (iii) power transmission, power distribution and storage which each include various RBICS groups &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;of sub-industries. The Index Provider assigns each identified company to one of the sub-themes based on (1) the primary source of revenue or (2)&#160;other factors, including a company&#x2019;s business description, when the primary source of revenue is not definitive on a sub-theme. &lt;/span&gt;&lt;/div&gt;  &lt;div style="margin-top: 6pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Constituents of the Underlying Index are weighted by float-adjusted market capitalization subject to a capping methodology &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;at each quarterly rebalance. The capping methodology limits the weight of (1) any single company to a maximum of 6% of &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;the Underlying Index; (2) all companies with a weight above 4.5% to an aggregate of 45% of the Underlying Index;&#160; &lt;/span&gt;&lt;/div&gt;  &lt;div style="line-height: 11.0pt; text-align: left;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;(3) companies in the power generation sub-theme to 50% of the Underlying Index; and (4) companies in the energy supply &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;for electrification and power transmission, power distribution, storage sub-themes to an aggregate of 50% of the Underlying &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Index. &lt;/span&gt;&lt;/div&gt;  &lt;div style="margin-top: 6pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;The Underlying Index is rebalanced quarterly and reconstituted annually in December.&lt;/span&gt;&lt;/div&gt;  &lt;div style="margin-top: 6pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;The Underlying Index may include large-, mid- and small-capitalization companies. As of March 31, 2026, a significant &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;portion of the Underlying Index was represented by securities of companies in the industrials and utilities industries or &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;sectors. The components of the Underlying Index are likely to change over time.&lt;/span&gt;&lt;/div&gt;  &lt;div style="margin-top: 7pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;The Fund seeks to track the investment results of the Underlying Index before fees and expenses of the Fund. BFA uses a&lt;/span&gt; &lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;representative sampling indexing strategy to manage the Fund.&lt;/span&gt; &lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Representative sampling&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt; &lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;is an indexing strategy that&lt;/span&gt; &lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;involves investing in a representative sample of securities or other instruments intended to collectively have an investment&lt;/span&gt; &lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;profile similar to that of an applicable underlying index. The instruments selected are expected to have, in the aggregate, &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;investment characteristics (based on factors such as market capitalization and industry weightings), fundamental &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;characteristics (such as return variability and yield) and liquidity measures similar to those of an applicable underlying index. &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;The Fund may or may not hold all of the components of the Underlying Index. The Fund may use derivatives to gain or reduce &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;exposure to the components of the Underlying Index or exposure to one or more market risk factors associated with such &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;components. Subject to the limits described herein, the Fund may purchase and hold cash and cash equivalents, including &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;shares of money market funds advised by BFA or its affiliates, and may also purchase and hold instruments not included in &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;the Underlying Index when BFA believes that such instruments will help the Fund track the performance of the Underlying &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Index over time, including in light of expected liquidity or trading costs, anticipated additions to or deletions from the &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Underlying Index, or other reasons as determined by BFA.&lt;/span&gt;&lt;/div&gt;   &lt;div style="margin-top: 7pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;In accordance with Rule 35d-1 under the Investment Company Act of 1940, as amended (the &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;1940 Act&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;), under normal &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;circumstances, the Fund will not invest less than 80% of the value of its net assets, plus the amount of any borrowings for &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;investment purposes, in components of its Underlying Index. Investments in derivatives and other investments will be &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;counted toward the Fund&#x2019;s 80% investment policy to the extent that they provide exposure to the components of its &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Underlying Index or exposure to one or more market risk factors associated with such components. The Fund&#x2019;s 80% &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;investment policy may be changed by the Company's Board of Directors (the &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Board&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;) upon 60 days&#x2019; notice to shareholders.&lt;/span&gt;&lt;/div&gt;   &lt;div style="margin-top: 7pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;The Fund may lend securities representing up to one-third of the value of the Fund's total assets (including the value of any &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;collateral received).&lt;/span&gt;&lt;/div&gt;  &lt;div style="margin-top: 7pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;The Underlying Index is a product of SPDJI, which is&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt; line-height: 11pt;"&gt;&#x2009;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;independent of the Fund and BFA. The Index Provider determines the &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;composition and relative weightings of the components of the Underlying Index and publishes information regarding the &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;market value of the Underlying Index.&lt;/span&gt;&lt;/div&gt;   &lt;div style="margin-top: 7pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt; font-weight: bold;"&gt;Industry Concentration Policy.&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#160;The Fund will concentrate its investments (&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt; font-style: italic;"&gt;i.e.&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;, hold 25% or more of its total assets) in a &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;particular industry or group of industries to approximately the same extent that the Underlying Index is concentrated. For &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;purposes of this limitation, securities of the U.S. government (including its agencies and instrumentalities) and repurchase &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;agreements collateralized by U.S. government securities are not considered to be issued by members of any industry.&lt;/span&gt;&lt;/div&gt;  </oef:StrategyNarrativeTextBlock>
    <fnd:NmRule35d1TermDfnSmryTextBlock
      contextRef="S000035884Member"
      id="t_62_f4989588_1b1a_545e_fea2_237f295126e2"> &lt;div style="margin-top: 6pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;The Fund seeks to track the investment results of the S&amp;amp;P U.S. Power Infrastructure Select Index (the &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Underlying Index&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;), &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;which measures the performance of equity securities of U.S.-domiciled companies involved in U.S. power infrastructure, as &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;determined by S&amp;amp;P Dow Jones Indices LLC (the &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Index Provider&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt; or &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;SPDJI&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;). The Index Provider constructs the Underlying &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Index by including those companies within the S&amp;amp;P 1500 Composite Index (the &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Parent Index&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;) that derive at least 50% of &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;their total revenue from U.S. power infrastructure-related businesses, excluding certain oil &amp;amp; gas companies not involved in &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;natural gas, as defined by FactSet&#x2019;s Revere Business Industry Classification System (&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;RBICS&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;).&lt;/span&gt;&lt;/div&gt; </fnd:NmRule35d1TermDfnSmryTextBlock>
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      contextRef="S000035884Member"
      id="t_63_62498379_b9c0_8c0c_0707_40f17f4c46ab">The Fund seeks to track the investment results of the Underlying Index before fees and expenses of the Fund. BFA uses arepresentative sampling indexing strategy to manage the Fund.&#x201c;Representative sampling&#x201d;is an indexing strategy thatinvolves investing in a representative sample of securities or other instruments intended to collectively have an investmentprofile similar to that of an applicable underlying index.</fnd:NmRule35d1TermSlctnCritSmryTextBlock>
    <fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock
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      id="t_61_359ff842_edc7_a8a2_7e9d_1f72ccda0d45"> &lt;div style="margin-top: 7pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;In accordance with Rule 35d-1 under the Investment Company Act of 1940, as amended (the &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;1940 Act&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;), under normal &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;circumstances, the Fund will not invest less than 80% of the value of its net assets, plus the amount of any borrowings for &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;investment purposes, in components of its Underlying Index. Investments in derivatives and other investments will be &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;counted toward the Fund&#x2019;s 80% investment policy to the extent that they provide exposure to the components of its &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Underlying Index or exposure to one or more market risk factors associated with such components. The Fund&#x2019;s 80% &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;investment policy may be changed by the Company's Board of Directors (the &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Board&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;) upon 60 days&#x2019; notice to shareholders.&lt;/span&gt;&lt;/div&gt; </fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock>
    <oef:StrategyPortfolioConcentration
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      id="t_24_7b60aedd_70cc_0599_c8c0_3eba4c4d333a"> Industry Concentration Policy.&#160;The Fund will concentrate its investments (i.e., hold 25% or more of its total assets) in a particular industry or group of industries to approximately the same extent that the Underlying Index is concentrated. For purposes of this limitation, securities of the U.S. government (including its agencies and instrumentalities) and repurchase agreements collateralized by U.S. government securities are not considered to be issued by members of any industry. </oef:StrategyPortfolioConcentration>
    <oef:RiskTextBlock
      contextRef="D20260331_20260331_S000035884Member_RiskLoseMoneyMember"
      id="t_25_837ddd84_a2c6_12e7_a30b_7d953cf98ca4">As with any investment, you could lose all or part of your investment in the Fund, and the Fund's performance could trail thatof other investments.</oef:RiskTextBlock>
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      contextRef="D20260331_20260331_S000035884Member_UtilityCompaniesRiskMember"
      id="t_26_058a33f7_a9a1_63b3_9c8d_4eadd21290db"> &lt;div style="margin-top: 7pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt; font-weight: bold;"&gt;Utility Companies Risk.&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt; The utilities sector is generally subject to significant government regulation and oversight, including &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;restrictions on rates as well as environmental and other regulations. Utility companies also may face risks related to, among &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;other things, natural disasters, cyber or other attacks, capital project funding, energy price volatility and increased &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;competition.&lt;/span&gt;&lt;/div&gt; </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="D20260331_20260331_S000035884Member_IndustrialCompaniesRiskMember"
      id="t_27_8e8672e7_d756_275e_7e88_786ad582e8e4"> &lt;div style="margin-top: 7pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt; font-weight: bold;"&gt;Industrial Companies Risk.&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt; Industrial companies face a number of risks, including supply chain and distribution disruptions, &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;business interruptions, product obsolescence, third-party vendor risks, cyber attacks, trade disputes, product recalls, liability &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;claims, scarcity of materials or parts, excess capacity, changes in consumer preferences, and volatility in commodity prices &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;and currencies. The performance of such companies may also be affected by technological developments, labor relations, &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;legislative and regulatory changes, government spending policies, and changes in domestic and international economies.&lt;/span&gt;&lt;/div&gt; </oef:RiskTextBlock>
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      contextRef="D20260331_20260331_S000035884Member_RiskOfInvestingInTheUSMember"
      id="t_28_b7a590df_616b_aa8b_a800_061fb81ffd22"> &lt;div style="margin-top: 7pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt; font-weight: bold;"&gt;Risk of Investing in the U.S.&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt; Investing in U.S. issuers subjects the Fund to legal, regulatory, political, currency, security, and &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;economic risks that are specific to the U.S. Certain changes in the U.S., such as a weakening of the U.S. economy or a decline &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;in its financial markets, may have an adverse effect on U.S. issuers.&lt;/span&gt;&lt;/div&gt; </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="D20260331_20260331_S000035884Member_EquitySecuritiesRiskMember"
      id="t_29_97e34be1_6f57_9d32_1f55_8da5e837afc4"> &lt;div style="line-height: 11.0pt; text-align: left;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt; font-weight: bold;"&gt;Equity Securities Risk.&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt; Equity securities are subject to changes in value, and their values may be more volatile than those of &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;other asset classes. The value of a security may decline for a number of reasons that may directly relate to the issuer as well as &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;due to general industry or market conditions. Common stock is subordinated to preferred securities and debt in a company&#x2019;s &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;capital structure. Common stock has the lowest priority, and the greatest risk, with respect to dividends and any liquidation &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;payments in the event of an issuer&#x2019;s bankruptcy.&lt;/span&gt;&lt;/div&gt; </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="D20260331_20260331_S000035884Member_MarketRisksMember"
      id="t_30_72831950_633c_44a3_c753_792e705bd349"> &lt;div style="margin-top: 7pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt; font-weight: bold;"&gt;Market Risk.&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt; The Fund could lose money over short periods due to short-term market movements and over longer periods &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;during more prolonged market downturns. Local, regional or global events such as war, acts of terrorism, pandemics or other &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;public health issues, recessions, the prospect or occurrence of a sovereign default or other financial crisis, or other events &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;could have a significant impact on the Fund&#x2009;and its investments and could result in increased premiums or discounts to the &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Fund&#x2019;s NAV.&lt;/span&gt;&lt;/div&gt; </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="D20260331_20260331_S000035884Member_IndexRelatedRiskMember"
      id="t_31_e7b66999_628d_bf96_0fb4_d1d8ff56234e"> &lt;div style="margin-top: 7pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt; font-weight: bold;"&gt;Index-Related Risk.&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt; The Index Provider may rely on various sources of information to assess the criteria of components of the &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Underlying Index, including information that may be based on assumptions and estimates. Neither the Fund nor BFA can &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;offer assurances that the Index Provider&#x2019;s methodology or sources of information will provide an accurate assessment of &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;included components or will result in the Fund meeting its investment objective. Errors in index data, index computations or &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;the construction of the Underlying Index in accordance with its methodology may occur, and the Index Provider may not &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;identify or correct them promptly or at all, which may have an adverse impact on the Fund and its shareholders. Unusual &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;market conditions or other unforeseen circumstances (such as natural disasters, political unrest or war) may impact the Index &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Provider or a third-party data provider and could cause the Index Provider to postpone a scheduled rebalance. This could &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;cause the Underlying Index to vary from its normal or expected composition.&lt;/span&gt;&lt;/div&gt; </oef:RiskTextBlock>
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      contextRef="D20260331_20260331_S000035884Member_AssetClassRiskMember"
      id="t_32_1f4297b7_e959_37a0_456f_4c45b07e450a"> &lt;div style="margin-top: 7pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt; font-weight: bold;"&gt;Asset Class Risk.&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt; The securities and other assets in the Underlying Index or in the Fund&#x2019;s portfolio may underperform in &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;comparison to financial markets generally, a particular financial market, another index, or other asset classes.&lt;/span&gt;&lt;/div&gt; </oef:RiskTextBlock>
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      contextRef="D20260331_20260331_S000035884Member_AuthorizedParticipantConcentrationRiskMember"
      id="t_65_6562985f_aae3_a91e_cfec_c35038746f23"> &lt;div style="margin-top: 7pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt; font-weight: bold;"&gt;Authorized Participant Concentration Risk.&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt; An &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Authorized Participant&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt; is a member or participant of a clearing agency &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;registered with the SEC, which has a written agreement with the Fund or one of its service providers that allows the &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Authorized Participant to place orders for the purchase and redemption of creation units (&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Creation Units&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;). Only an &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Authorized Participant may engage in creation or redemption transactions directly with the Fund. There are a limited number &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;of institutions that may act as Authorized Participants for the Fund, including on an agency basis on behalf of other market &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;participants. No Authorized Participant is obligated to engage in creation or redemption transactions. To the extent that &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Authorized Participants exit the business or do not place creation or redemption orders for the Fund and no other Authorized &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Participant places orders, Fund shares are more likely to trade at a premium or discount to NAV and possibly face trading &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;halts or delisting.&lt;/span&gt;&lt;/div&gt; </oef:RiskTextBlock>
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      contextRef="D20260331_20260331_S000035884Member_CommodityRiskMember"
      id="t_34_e284cdad_7cab_3562_9980_99ae7653a0e3"> &lt;div style="margin-top: 7pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt; font-weight: bold;"&gt;Commodity Risk.&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt; The Fund invests in companies that are susceptible to fluctuations in certain commodity markets and to &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;price changes due to trade relations. Any negative changes in commodity markets that may be due to changes in supply and &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;demand for commodities, market events, war, regulatory developments, other catastrophic events, or other factors that the &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Fund cannot control could have an adverse impact on those companies.&lt;/span&gt;&lt;/div&gt; </oef:RiskTextBlock>
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      contextRef="D20260331_20260331_S000035884Member_ConcentrationRiskMember"
      id="t_35_01c6b3c1_5fdb_3950_8eda_b3364102f3fa"> &lt;div style="margin-top: 7pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt; font-weight: bold;"&gt;Concentration Risk.&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt; The Fund may be susceptible to an increased risk of loss, including losses due to adverse events that &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;affect the Fund&#x2019;s investments more than the market as a whole, to the extent that the Fund&#x2019;s investments are concentrated in &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;the securities or other assets of one or more issuers, countries or other geographic units, markets, industries, project types, or &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;asset classes.&lt;/span&gt;&lt;/div&gt; </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="D20260331_20260331_S000035884Member_IssuerRiskMember"
      id="t_36_18d88879_a882_883a_91d3_88f411f6c56f"> &lt;div style="margin-top: 7pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt; font-weight: bold;"&gt;Issuer Risk.&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt; The performance of the Fund depends on the performance of individual securities or other assets to which the &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Fund has exposure. The value of securities or other assets may decline, or perform differently from the market as a whole, due &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;to changes in the financial condition or credit rating of the issuer or counterparty.&lt;/span&gt;&lt;/div&gt; </oef:RiskTextBlock>
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      contextRef="D20260331_20260331_S000035884Member_LargeCapitalizationCompaniesRiskMember"
      id="t_37_1de65b90_64b8_abf9_90ff_659f58830ff7"> &lt;div style="margin-top: 7pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt; font-weight: bold;"&gt;Large-Capitalization Companies Risk.&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt; Large-capitalization companies may be less able than smaller-capitalization &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;companies to adapt to changing market conditions and competitive challenges. Large-capitalization companies may be more &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;mature and subject to more limited growth potential compared with smaller-capitalization companies. The performance of &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;large-capitalization companies could trail the overall performance of the broader securities markets.&lt;/span&gt;&lt;/div&gt; </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="D20260331_20260331_S000035884Member_ManagementRiskMember"
      id="t_38_2f468d64_7dcc_bf5d_34b9_c6ef8e918766"> &lt;div style="margin-top: 7pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt; font-weight: bold;"&gt;Management Risk.&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt; The Fund does not try to &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;beat&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt; the Underlying Index it tracks and does not attempt to take defensive &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;positions under any market conditions, including declining markets. As the Fund will not fully replicate the Underlying Index &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;and may hold securities or other assets not included in the Underlying Index, it is subject to the risk that BFA&#x2019;s investment &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;strategy may not produce the intended results. There is no guarantee that the Fund&#x2019;s investment results will have a high &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;degree of correlation to those of the Underlying Index or that the Fund will achieve its investment objective.&lt;/span&gt;&lt;/div&gt; </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="D20260331_20260331_S000035884Member_MarketTradingRiskMember"
      id="t_39_3e3a63af_c71f_1b3e_f4dc_4b0dcb4f0e14"> &lt;div style="margin-top: 7pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt; font-weight: bold;"&gt;Market Trading Risk.&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt; The Fund faces numerous market trading risks, including the potential lack of an active market for &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Fund shares (including through a trading halt), losses from trading in secondary markets, periods of high volatility, and &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;disruptions in the process of creating and redeeming Fund shares. Any of these factors, among others, may lead to the Fund&#x2019;s &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;shares trading in the secondary market at a premium or discount to NAV or to the intraday value of the Fund&#x2019;s portfolio &lt;/span&gt;&lt;/div&gt;  &lt;div style="line-height: 11.0pt; text-align: left;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;holdings. If you buy Fund shares at a time when the market price is at a premium to NAV or sell Fund shares at a time when &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;the market price is at a discount to NAV, you may pay significantly more or receive significantly less than the underlying value &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;of the Fund shares.&lt;/span&gt;&lt;/div&gt; </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="D20260331_20260331_S000035884Member_RiskNondiversifiedStatusMember"
      id="t_40_9cd1f2d9_ada0_6a9d_6788_658a07586827"> &lt;div style="margin-top: 7pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt; font-weight: bold;"&gt;Non-Diversification Risk.&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt; The Fund is classified as &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;non-diversified.&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt; This means that, compared with funds that are &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;classified as &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;diversified,&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt; the Fund may invest a greater percentage of its assets in securities or other instruments &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;representing a small number of issuers or counterparties and thus may be more susceptible to the risks associated with these &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;particular issuers or counterparties. As a result, the Fund's performance may depend to a greater extent on the performance &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;of a small number of issuers or counterparties, which may lead to more volatility in the Fund&#x2019;s NAV.&lt;/span&gt;&lt;/div&gt; </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="D20260331_20260331_S000035884Member_OperationalAndTechnologyRisksMember"
      id="t_66_1febbdb6_43f6_1990_ddfb_6244762a979e"> &lt;div style="margin-top: 7pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt; font-weight: bold;"&gt;Operational and Technology Risks.&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt; The Fund is directly and indirectly susceptible to operational and technology risks, &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;including those related to human errors, processing errors, communication errors, systems failures, cybersecurity incidents, &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;and the use of artificial intelligence and machine learning (&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;AI&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;), which may result in losses for the Fund and its shareholders &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;or may impair the Fund&#x2019;s operations. While the Fund&#x2019;s service providers are required to have appropriate operational, &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;information security and cybersecurity risk management policies and procedures, their methods of risk management may &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;differ from those of the Fund. Operational and technology risks for the issuers in which the Fund invests could also result in &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;material adverse consequences for such issuers and may cause the Fund&#x2019;s investments in such issuers to lose value.&lt;/span&gt;&lt;/div&gt; </oef:RiskTextBlock>
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      contextRef="D20260331_20260331_S000035884Member_SecuritiesLendingRiskMember"
      id="t_42_64ccc876_3142_9755_baa9_d9a2620d1ad9"> &lt;div style="margin-top: 7pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt; font-weight: bold;"&gt;Securities Lending Risk.&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt; The Fund may engage in securities lending. Securities lending involves the risk that the Fund may &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;lose money because the borrower of the loaned securities fails to return the securities in a timely manner or at all. The Fund &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;could also lose money in the event of a decline in the value of collateral provided for loaned securities or a decline in the value &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;of any investments made with cash collateral. These events could also trigger adverse tax consequences for the Fund.&lt;/span&gt;&lt;/div&gt; </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="D20260331_20260331_S000035884Member_TrackingErrorRiskMember"
      id="t_43_a9560579_5363_4d01_beb3_4c2d2f6f3eca"> &lt;div style="margin-top: 7pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt; font-weight: bold;"&gt;Tracking Error Risk.&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt; The Fund may be subject to &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;tracking error,&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt; which is the divergence of the Fund&#x2019;s performance from that &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;of the Underlying Index. Tracking error may occur due to a number of factors, including differences between the securities &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;and other assets held in the Fund&#x2019;s portfolio and those included in the Underlying Index; differences in the timing and &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;methodologies used to value securities and other assets; transaction costs and other expenses incurred by the Fund that the &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Underlying Index does not incur; the Fund&#x2019;s holding of uninvested cash; differences in the timing of the accrual or the &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;valuation of dividends or interest received by the Fund or distributions paid to Fund shareholders; tax gains or losses; &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;differences between the amount and/or timing of withholding taxes on dividends reflected in the Underlying Index from the &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;Fund&#x2019;s obligation, if any, for foreign withholding taxes; the requirements for the Fund to maintain pass-through tax treatment; &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;portfolio transactions carried out to minimize the distribution of capital gains to shareholders; the acceptance of custom &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;baskets; changes to the Underlying Index including the ability and timing of the Fund to adjust its portfolio to reflect changes &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;in the Underlying Index; and impacts to the Fund of complying with certain regulatory requirements or limits. Tracking error &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;risk may be heightened during times of increased market volatility or other unusual market conditions.&lt;/span&gt;&lt;/div&gt; </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="D20260331_20260331_S000035884Member_ValuationRiskMember"
      id="t_44_352e9b53_9b71_f764_77b1_fbef302e2829"> &lt;div style="margin-top: 7pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt; font-weight: bold;"&gt;Valuation Risk.&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt; The price that the Fund could receive upon the sale (or other disposition) of a security or other asset may &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;differ from the Fund&#x2019;s valuation of the security or other asset, particularly for securities or other assets that trade in low &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;volume or volatile markets or that are valued using a fair value methodology. The price received by the Fund also may differ &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;from the value used by the Underlying Index. In addition, the value of the securities or other assets in the Fund&#x2019;s portfolio may &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;change on days or during time periods when investors are not able to purchase or sell Fund shares. Authorized Participants &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;that create or redeem Fund shares on days when the Fund is holding fair-valued securities or other assets may receive fewer &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;or more shares, or lower or higher redemption proceeds, than they would have received had the securities or other assets not &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;been fair valued or been valued using a different methodology. The ability to value investments may be impacted by &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;technological issues or errors by pricing services or other third-party service providers.&lt;/span&gt;&lt;/div&gt; </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="S000035884Member"
      id="t_10_5cffa013_e304_4d06_9a0a_83c43fa4e2f4"> Performance Information </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="S000035884Member"
      id="t_49_b78ee682_0d84_a4a7_162c_e21f64c99857"> &lt;div style="margin-top: 6pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;The performance information below illustrates how the Fund&#x2019;s performance has varied over different periods and provides&lt;/span&gt; &lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;some indication of the risks of investing in the Fund. The bar chart shows how the performance of the Fund has varied from&lt;/span&gt; &lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;one calendar year to another over the periods shown. The table compares the Fund&#x2019;s performance to that of an appropriate&lt;/span&gt; &lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;broad-based securities market index&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt; line-height: 11pt;"&gt;&#x2009;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;and the Underlying Index. Returns assume the reinvestment of any dividends and &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;distributions. The Fund&#x2019;s returns reflect the impact of any agreements to waive or reimburse expenses, which would reduce &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;performance if not in effect. Past performance (before and after taxes) does not necessarily indicate how the Fund will&lt;/span&gt; &lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;perform in the future. Updated performance information, including the Fund&#x2019;s current NAV, may be obtained by visiting &lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;www.iShares.com or by calling 1-800-iShares (1-800-474-2737) (toll free).&lt;/span&gt;&lt;/div&gt; </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="S000035884Member"
      id="t_45_4aa74490_2ccb_2955_6d92_65becb3ca146">The performance information below illustrates how the Fund&#x2019;s performance has varied over different periods and providessome indication of the risks of investing in the Fund. The bar chart shows how the performance of the Fund has varied fromone calendar year to another over the periods shown. The table compares the Fund&#x2019;s performance to that of an appropriatebroad-based securities market indexand the Underlying Index.</oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="S000035884Member"
      id="t_46_7bfc6fda_7ff0_3104_0c8a_c4142b36f067">Past performance (before and after taxes) does not necessarily indicate how the Fund willperform in the future.</oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="S000035884Member"
      id="t_47_4a6c29ea_8989_c204_a482_87e4c8b65f7a">www.iShares.com</oef:PerformanceAvailabilityWebSiteAddress>
    <oef:PerformanceAvailabilityPhone
      contextRef="S000035884Member"
      id="t_48_f32ba5a0_1426_3dc6_9abf_ccd0131631e9">1-800-iShares (1-800-474-2737) (toll free)</oef:PerformanceAvailabilityPhone>
    <oef:BarChartHeading
      contextRef="S000035884Member"
      id="t_50_0abdc52d_5c8b_3ca1_e62b_1501dd1461cd"> Calendar Year-by-Year Returns (%)&#x2003; </oef:BarChartHeading>
    <oef:BarChartClosingTextBlock
      contextRef="S000035884Member"
      id="t_53_59bd4474_002a_4e00_fcae_f7f971ca4f30"> 
&lt;table cellpadding="0" cellspacing="0" style="empty-cells: show; margin-left: 0.75pt; width: 252pt;"&gt; 
&lt;tr style="height: 20pt;"&gt; 
&lt;td style="background-color: #ffffff; padding-bottom: 4pt; padding-top: 4pt; vertical-align: Bottom; width: 125.15pt;"&gt; &lt;div style="line-height: 0.5pt; text-align: left;"&gt; &lt;div style="margin-right: 3pt; text-align: center; white-space: nowrap;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 8pt; font-weight: bold;"&gt;&#160;&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/td&gt; 
&lt;td style="background-color: #ffffff; padding-bottom: 2pt; padding-top: 2pt; vertical-align: Bottom; width: 49.46pt;"&gt; &lt;div style="line-height: 12pt; text-align: left;"&gt; &lt;div style="border-bottom: 1pt groove #000000; margin-left: 1pt; margin-right: 1pt; text-align: center; white-space: nowrap;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 8pt; font-weight: bold;"&gt;Return (%)&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/td&gt; 
&lt;td style="background-color: #ffffff; padding-bottom: 2pt; padding-top: 2pt; vertical-align: Bottom; width: 77.39pt;"&gt; &lt;div style="line-height: 12pt; text-align: left;"&gt; &lt;div style="margin-left: 3pt; text-align: center; white-space: nowrap;"&gt;&lt;span style="border-bottom: 1pt groove #000000; color: #000000; font-family: arial; font-size: 8pt; font-weight: bold;"&gt;Period Ended&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/td&gt; &lt;/tr&gt; 
&lt;tr style="height: 12pt;"&gt; 
&lt;td style="background-color: azure; padding-bottom: 2pt; padding-top: 4pt; vertical-align: Bottom; width: 125.15pt;"&gt; &lt;div style="line-height: 10pt; text-align: left;"&gt; &lt;div style="margin-right: 3pt; text-align: left; white-space: nowrap;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 8pt; font-weight: bold; margin-left: 0.0pt;"&gt;Calendar Year-to-Date Return&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/td&gt; 
&lt;td style="background-color: azure; padding-bottom: 2pt; padding-top: 4pt; vertical-align: Bottom; white-space: nowrap; width: 49.46pt;"&gt; &lt;div style="line-height: 10pt; margin-left: 3pt; margin-right: 3pt; text-align: right; width: 43.46pt;"&gt; &lt;div style="display: flex; margin: auto; width: 43.98pt;"&gt; &lt;div style="display: flex; white-space: nowrap; width: 43.98pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 8pt; margin-left: 3.45pt;"&gt;19.79%%&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/div&gt; &lt;/td&gt; 
&lt;td style="background-color: azure; padding-bottom: 2pt; padding-top: 4pt; vertical-align: Bottom; width: 77.39pt;"&gt; &lt;div style="line-height: 10pt; text-align: left;"&gt; &lt;div style="margin-left: 3pt; text-align: right; white-space: nowrap;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 8pt;"&gt;June 30, 2026&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/td&gt; &lt;/tr&gt; 
&lt;tr style="height: 10pt;"&gt; 
&lt;td colspan="3" style="background-color: #ffffff; padding-bottom: 2pt; padding-top: 2pt; vertical-align: Bottom; width: 252.00pt;"&gt; &lt;div style="line-height: 10pt; text-align: left;"&gt; &lt;div style="text-align: left; white-space: nowrap;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 8pt; font-weight: bold; margin-left: 0.0pt;"&gt;During the periods shown in the chart:&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 7.60pt; line-height: 10pt; margin-left: 0.0pt;"&gt; &lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/td&gt; &lt;/tr&gt; 
&lt;tr style="height: 10pt;"&gt; 
&lt;td style="background-color: azure; padding-bottom: 2pt; padding-top: 2pt; vertical-align: Bottom; width: 125.15pt;"&gt; &lt;div style="line-height: 10pt; text-align: left;"&gt; &lt;div style="margin-right: 3pt; text-align: left; white-space: nowrap;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 8pt; margin-left: 8.00pt;"&gt;Best Quarter&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/td&gt; 
&lt;td style="background-color: azure; padding-bottom: 2pt; padding-top: 2pt; vertical-align: Bottom; white-space: nowrap; width: 49.46pt;"&gt; &lt;div style="line-height: 10pt; margin-left: 3pt; margin-right: 3pt; text-align: right; width: 43.46pt;"&gt; &lt;div style="display: flex; margin: auto; width: 43.98pt;"&gt; &lt;div style="display: flex; white-space: nowrap; width: 43.98pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 8pt; margin-left: 3.45pt;"&gt;26.37%&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/div&gt; &lt;/td&gt; 
&lt;td style="background-color: azure; padding-bottom: 2pt; padding-top: 2pt; vertical-align: Bottom; width: 77.39pt;"&gt; &lt;div style="line-height: 10pt; text-align: left;"&gt; &lt;div style="margin-left: 3pt; text-align: right; white-space: nowrap;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 8pt;"&gt;December 31, 2020&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/td&gt; &lt;/tr&gt; 
&lt;tr style="height: 10pt;"&gt; 
&lt;td style="background-color: #ffffff; padding-bottom: 2pt; padding-top: 2pt; vertical-align: Bottom; width: 125.15pt;"&gt; &lt;div style="line-height: 10pt; text-align: left;"&gt; &lt;div style="margin-right: 3pt; text-align: left; white-space: nowrap;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 8pt; margin-left: 8.00pt;"&gt;Worst Quarter&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/td&gt; 
&lt;td style="background-color: #ffffff; padding-bottom: 2pt; padding-top: 2pt; vertical-align: Bottom; white-space: nowrap; width: 49.46pt;"&gt; &lt;div style="line-height: 10pt; margin-left: 3pt; margin-right: 3pt; text-align: right; width: 43.46pt;"&gt; &lt;div style="display: flex; margin: auto; width: 43.98pt;"&gt; &lt;div style="display: flex; white-space: nowrap; width: 43.98pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 8pt;"&gt;-45.06%&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/div&gt; &lt;/td&gt; 
&lt;td style="background-color: #ffffff; padding-bottom: 2pt; padding-top: 2pt; vertical-align: Bottom; width: 77.39pt;"&gt; &lt;div style="line-height: 10pt; text-align: left;"&gt; &lt;div style="margin-left: 3pt; text-align: right; white-space: nowrap;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 8pt;"&gt;March 31, 2020&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; </oef:BarChartClosingTextBlock>
    <oef:YearToDateReturnLabel
      contextRef="S000035884Member_C000109987Member"
      id="t_51_ac76e8e5_7a1f_2062_0fe6_b25b6f88d445">Calendar Year-to-Date Return</oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="S000035884Member_C000109987Member"
      decimals="4"
      id="h_36_025e0b61_e0ac_5583_f571_1fb96cfa4004"
      unitRef="pure">0.1979</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate
      contextRef="S000035884Member_C000109987Member"
      id="t_52_db3eeaed_b971_59e4_598a_2767ef5d1eff">2026-06-30</oef:BarChartYearToDateReturnDate>
    <oef:HighestQuarterlyReturnLabel
      contextRef="S000035884Member_C000109987Member"
      id="h_12_de7080b6_a9bf_4ecf_a4c0_5dffd5a6be32">Best Quarter</oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="S000035884Member_C000109987Member"
      decimals="4"
      id="h_13_52072107_73e7_4410_9ba8_f508c281b1a4"
      unitRef="pure">0.2637</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="S000035884Member_C000109987Member"
      id="h_14_42353c9e_f65d_42a7_ab46_a31662927fc9">2020-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel
      contextRef="S000035884Member_C000109987Member"
      id="h_15_c2a01849_0b0c_42df_a021_be0ef48304c6">Worst Quarter</oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="S000035884Member_C000109987Member"
      decimals="4"
      id="h_16_910fec7b_1baa_4f2c_953f_220639d064b8"
      unitRef="pure">-0.4506</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="S000035884Member_C000109987Member"
      id="h_17_7e3caf12_d823_4672_b538_3bb9ebfe579f">2020-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:PerformanceTableHeading
      contextRef="S000035884Member"
      id="t_54_da810c7f_4479_ae27_703f_9e3a69304bd8"> Average Annual Total Returns (%) (for the periods ended December 31, 2025)&#x2003; </oef:PerformanceTableHeading>
    <oef:PerfInceptionDate
      contextRef="D20120131_20251231_C000109987Member"
      id="t_67_09757d4a_ecc6_1a84_101a_4f0531890487">2012-01-31</oef:PerfInceptionDate>
    <oef:AvgAnnlRtrPct
      contextRef="FY2025_C000109987Member"
      decimals="4"
      id="h_18_3f0ea727_d50f_4b38_ab2a_53ef9b51f521"
      unitRef="pure">0.1004</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="FiveY2025_C000109987Member"
      decimals="4"
      id="h_19_8bb8bc5f_26f7_43d8_b096_a5b904d8391a"
      unitRef="pure">0.1820</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="TenY2025_C000109987Member"
      decimals="4"
      id="h_20_51932c06_8699_4246_9048_eb0cdb90e932"
      unitRef="pure">0.0816</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="FY2025_C000109987Member_AfterTaxesOnDistributionsMember"
      decimals="4"
      id="h_21_bd965f5a_2559_4f42_8791_e08c50567e7e"
      unitRef="pure">0.0818</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="FiveY2025_C000109987Member_AfterTaxesOnDistributionsMember"
      decimals="4"
      id="h_22_4f9876ba_3e71_495e_8fb6_176d5563c4a4"
      unitRef="pure">0.1685</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="TenY2025_C000109987Member_AfterTaxesOnDistributionsMember"
      decimals="4"
      id="h_23_63076723_6856_4814_9ac3_9874d15aa29e"
      unitRef="pure">0.0712</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="FY2025_C000109987Member_AfterTaxesOnDistributionsAndSalesMember"
      decimals="4"
      id="h_24_793aa520_aa4f_4c37_a445_dd62cf608343"
      unitRef="pure">0.0728</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="FiveY2025_C000109987Member_AfterTaxesOnDistributionsAndSalesMember"
      decimals="4"
      id="h_25_5bac664f_4da3_4c1c_8af3_92eb5beabcf7"
      unitRef="pure">0.1468</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="TenY2025_C000109987Member_AfterTaxesOnDistributionsAndSalesMember"
      decimals="4"
      id="h_26_3f82f7b3_5b9d_49ea_b4f4_d1b50375e17d"
      unitRef="pure">0.0648</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="FY2025_SPTotalMarketIndexMember"
      decimals="4"
      id="h_27_74d980cd_a138_4d96_82ec_b76f50dbd28d"
      unitRef="pure">0.1705</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="FiveY2025_SPTotalMarketIndexMember"
      decimals="4"
      id="h_28_1350a65f_93ad_4122_a6a9_80b7b55f2259"
      unitRef="pure">0.1307</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="TenY2025_SPTotalMarketIndexMember"
      decimals="4"
      id="h_29_d5aa2920_216a_4404_92c2_8f6ad9756e71"
      unitRef="pure">0.1422</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="FY2025_SPUSPowerInfrastructureSelectIndexMember"
      decimals="4"
      id="h_30_07225013_c5f0_4adf_a876_180f385b488e"
      unitRef="pure">0.1018</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="FiveY2025_SPUSPowerInfrastructureSelectIndexMember"
      decimals="4"
      id="h_31_f5a2d869_fcd6_45a3_9655_720c2b033714"
      unitRef="pure">0.1779</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="TenY2025_SPUSPowerInfrastructureSelectIndexMember"
      decimals="4"
      id="h_32_454b8f25_bcfd_4964_8a26_6b96392dc06d"
      unitRef="pure">0.0785</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="FY2025_MSCIAllCountryWorldIndexMember"
      decimals="4"
      id="h_33_03640a6c_0652_4937_a36e_42f62eec0f05"
      unitRef="pure">0.2234</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="FiveY2025_MSCIAllCountryWorldIndexMember"
      decimals="4"
      id="h_34_1b996163_eb23_46ce_91df_48af41f73a54"
      unitRef="pure">0.1119</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="TenY2025_MSCIAllCountryWorldIndexMember"
      decimals="4"
      id="h_35_1b3a9fcd_d8f2_4e44_b4ef_6fd2fb150b7b"
      unitRef="pure">0.1172</oef:AvgAnnlRtrPct>
    <oef:PerformanceTableMarketIndexChanged
      contextRef="S000035884Member"
      id="t_56_ffeebb69_1751_686c_fe99_661f3a5183c7">The S&amp;P U.S. Power Infrastructure Select Index (Spliced) reflects the performance of the MSCI ACWI Select Energy ProducersInvestable Market Index (Net) through October 28, 2025 and the S&amp;P U.S. Power Infrastructure Select Index thereafter, which reflectthe times when each index was the Underlying Index of the Fund.</oef:PerformanceTableMarketIndexChanged>
    <oef:PerformanceTableNarrativeTextBlock
      contextRef="S000035884Member"
      id="t_60_e0fff670_a208_3de7_ec0d_7f3946805fc7"> &lt;div style="margin-top: 7pt;"&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax&lt;/span&gt; &lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;rates and do not reflect the impact of state or local taxes. Actual after-tax returns depend on an investor&#x2019;s tax situation and&lt;/span&gt; &lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;may differ from those shown, and after-tax returns shown are not relevant to tax-exempt investors or investors who hold&lt;/span&gt; &lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201c;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;IRAs&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;&#x201d;&lt;/span&gt;&lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;). Fund returns&lt;/span&gt; &lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;after taxes on distributions and sales of Fund shares are calculated assuming that an investor has sufficient capital gains of&lt;/span&gt; &lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;the same character from other investments to offset any capital losses from the sales of Fund shares. As a result, Fund&lt;/span&gt; &lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;returns after taxes on distributions and sales of Fund shares may exceed Fund returns before taxes and/or returns after taxes&lt;/span&gt; &lt;span style="color: #000000; font-family: arial; font-size: 9pt;"&gt;on distributions.&lt;/span&gt;&lt;/div&gt; </oef:PerformanceTableNarrativeTextBlock>
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