S000008883 [Member] Investment Strategy - iShares Global Utilities ETF	Mar. 31, 2026
Prospectus [Line Items]
Strategy [Heading]	Principal Investment Strategies
Strategy Narrative [Text Block]	The Fund seeks to track the investment results of the S&P Global 1200 Utilities (Sector) Capped IndexTM (the “Underlying Index”), which measures the performance of companies that S&P Dow Jones Indices LLC (the “Index Provider” or “SPDJI”), a subsidiary of S&P Global, Inc., deems to be part of the utilities sector of the economy. The Underlying Index is a subset of the S&P Global 1200, which is designed to measure the performance of large-capitalization stocks from major global markets, as determined by SPDJI. The Underlying Index uses a capping methodology. The capping methodology limits the sum of the weights of the securities of all issuers that individually constitute more than 5% of the weight of the Underlying Index to a maximum of 25% of the weight of the Underlying Index in the aggregate. In order to implement this capping methodology, the Underlying Index constrains at quarterly rebalance the aggregate weight of all issuers that individually exceed 4.5% of the index weight to a maximum of 22.5%. Between scheduled quarterly index reviews, the Underlying Index is rebalanced at the end of any day on which all issuers that individually constitute more than 5% of the weight of the Underlying Index collectively represent more than 25% of the weight of the Underlying Index in the aggregate. In implementing this capping methodology, SPDJI considers two or more companies as belonging to the same issuer where more than 20% of all voting shares in a subsidiary are controlled by the same issuer control group. As of March 31, 2026, a significant portion of the Underlying Index was represented by securities of companies in the utilities industry or sector. The components of the Underlying Index are likely to change over time. As of March 31, 2026, the Underlying Index was composed of securities of companies in the following countries or regions: Australia, Austria, Brazil, Canada, Chile, Colombia, Denmark, Finland, France, Germany, Italy, Japan, Portugal, Spain, the United Kingdom (the “U.K.”) and the U.S. The Fund seeks to track the investment results of the Underlying Index before fees and expenses of the Fund. BFA uses a representative sampling indexing strategy to manage the Fund. “Representative sampling” is an indexing strategy that involves investing in a representative sample of securities or other instruments intended to collectively have an investment profile similar to that of an applicable underlying index. The instruments 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 and yield) and liquidity measures similar to those of an applicable underlying index. The Fund may or may not hold all of the components of the Underlying Index. The Fund may use derivatives to gain or reduce exposure to the components of the Underlying Index or exposure to one or more market risk factors associated with such components. Subject to the limits described herein, the Fund may purchase and hold cash and cash equivalents, including shares of money market funds advised by BFA or its affiliates, and may also purchase and hold instruments not included in the Underlying Index when BFA believes that such instruments will help the Fund track the performance of the Underlying Index over time, including in light of expected liquidity or trading costs, anticipated additions to or deletions from the Underlying Index, or other reasons as determined by BFA. In accordance with Rule 35d-1 under the Investment Company Act of 1940, as amended (the “1940 Act”), under normal circumstances, the Fund will not invest less than 80% of the value of its net assets, plus the amount of any borrowings for investment purposes, in components of its Underlying Index. Investments in derivatives and other investments will be counted toward the Fund’s 80% investment policy to the extent that they provide exposure to the components of its Underlying Index or exposure to one or more market risk factors associated with such components. The Fund’s 80% investment policy may be changed by the Trust’s Board of Trustees (the “Board”) upon 60 days’ notice to shareholders. The Fund may lend securities representing up to one-third of the value of the Fund's total assets (including the value of any collateral received). The Underlying Index is a product of SPDJI, which is independent of the Fund and BFA. The Index Provider determines the composition and relative weightings of the components of the Underlying Index and publishes information regarding the market value of the Underlying Index. Industry Concentration Policy. The Fund will concentrate its investments (i.e., hold 25% or more of its total assets) in a particular industry or group of industries to approximately the same extent that the Underlying Index is concentrated. For purposes of this limitation, securities of the U.S. government (including its agencies and instrumentalities) and repurchase agreements collateralized by U.S. government securities are not considered to be issued by members of any industry.
Strategy Portfolio Concentration [Text]	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) and repurchase agreements collateralized by U.S. government securities are not considered to be issued by members of any industry.

The Fund seeks to track the investment results of the S&P Global 1200 Utilities (Sector) Capped IndexTM (the “Underlying Index”), which measures the performance of companies that S&P Dow Jones Indices LLC (the “Index Provider” or “SPDJI”), a subsidiary of S&P Global, Inc., deems to be part of the utilities sector of the economy. The Underlying Index is a subset of the S&P Global 1200, which is designed to measure the performance of large-capitalization stocks from major global markets, as determined by SPDJI. The Underlying Index uses a capping methodology. The capping methodology limits the sum of the weights of the securities of all issuers that individually constitute more than 5% of the weight of the Underlying Index to a maximum of 25% of the weight of the Underlying Index in the aggregate. In order to implement this capping methodology, the Underlying Index constrains at quarterly rebalance the aggregate weight of all issuers that individually exceed 4.5% of the index weight to a maximum of 22.5%. Between scheduled quarterly index reviews, the Underlying Index is rebalanced at the end of any day on which all issuers that individually constitute more than 5% of the weight of the Underlying Index collectively represent more than 25% of the weight of the Underlying Index in the aggregate. In implementing this capping methodology, SPDJI considers two or more companies as belonging to the same issuer where more than 20% of all voting shares in a subsidiary are controlled by the same issuer control group.

The Fund seeks to track the investment results of the Underlying Index before fees and expenses of the Fund. BFA uses a representative sampling indexing strategy to manage the Fund. “Representative sampling” is an indexing strategy that involves investing in a representative sample of securities or other instruments intended to collectively have an investment profile similar to that of an applicable underlying index. The instruments 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 and yield) and liquidity measures similar to those of an applicable underlying index. The Fund may or may not hold all of the components of the Underlying Index. The Fund may use derivatives to gain or reduce exposure to the components of the Underlying Index or exposure to one or more market risk factors associated with such components. Subject to the limits described herein, the Fund may purchase and hold cash and cash equivalents, including shares of money market funds advised by BFA or its affiliates, and may also purchase and hold instruments not included in the Underlying Index when BFA believes that such instruments will help the Fund track the performance of the Underlying Index over time, including in light of expected liquidity or trading costs, anticipated additions to or deletions from the Underlying Index, or other reasons as determined by BFA.

In accordance with Rule 35d-1 under the Investment Company Act of 1940, as amended (the “1940 Act”), under normal circumstances, the Fund will not invest less than 80% of the value of its net assets, plus the amount of any borrowings for investment purposes, in components of its Underlying Index. Investments in derivatives and other investments will be counted toward the Fund’s 80% investment policy to the extent that they provide exposure to the components of its Underlying Index or exposure to one or more market risk factors associated with such components. The Fund’s 80% investment policy may be changed by the Trust’s Board of Trustees (the “Board”) upon 60 days’ notice to shareholders.

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) and repurchase agreements collateralized by U.S. government securities are not considered to be issued by members of any industry.