S000070653 [Member] Investment Strategy - iShares International Developed Small Cap Value Factor 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 FTSE Developed ex US ex Korea Small Cap Focused Value Index (the “Underlying Index”), which is provided by FTSE International Limited (the “Index Provider” or “FTSE”). The Underlying Index measures the performance of securities of international developed market small-capitalization companies, excluding the U.S. and Korea, with prominent value factor characteristics, as determined by the Index Provider. The Underlying Index is a subset of the FTSE Developed ex US ex Korea Small Cap Index (the “Parent Index”), which measures the performance of the small-capitalization segment of the international developed equity market, excluding the U.S. and Korea, as defined by the Index Provider. The construction of the Underlying Index begins with the Parent Index and excludes companies that are ranked in the least liquid 20% based on the 60-day average dollar value traded. The list of eligible constituents is then narrowed to exclude the top 20% of Parent Index constituents with the highest risk based on a 12-month trailing realized volatility. The list is further narrowed to exclude the top 20% of Parent Index constituents with the highest leverage, which is measured by comparing a company’s total debt to its total assets. Following these three initial screens, the remaining companies are evaluated to exclude companies with a negative sentiment score and negative price momentum. The sentiment score is calculated using the number of upgrades for earnings per share and the number of downgrades for earnings per share for a company's current and next fiscal year. A company with more downgrades for earnings per share than upgrades will have a negative sentiment score. Negative price momentum is determined based on monthly price returns over the trailing 12 months, excluding the latest month. The remaining companies are then ranked based on a weighted composite score of three value factor metrics: price-to-book, price-to-earnings and price-to-cash flow from operations (the “Composite Score”). The number of securities in the Underlying Index is approximately 25% of the number of securities in the Parent Index. The selected securities are weighted in proportion to their float-adjusted market capitalization with a country constraint of +/- 10% relative to the Parent Index to form a baseline or target composition (the “Target Index”). The Underlying Index is reviewed monthly and rebalanced to the Target Index if either of the following conditions is met: (i) the Underlying Index’s Composite Score is less than 90% of the Target Index’s Composite Score; or (ii) the Underlying Index has fewer than 20% of the number of securities by count of the Parent Index. If no rebalance is triggered, the component securities of the Underlying Index and their weights will remain unchanged. The Underlying Index may not rebalance for a period of time and is typically composed of 450 - 550 components. As of March 31, 2026, a significant portion of the Underlying Index was represented by securities of companies in the consumer goods and services, financials and industrials industries or sectors. The components of the Underlying Index are likely to change over time. As of March 31, 2026, the Underlying Index had 499 components. 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 sponsored by FTSE, 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 FTSE Developed ex US ex Korea Small Cap Focused Value Index (the “Underlying Index”), which is provided by FTSE International Limited (the “Index Provider” or “FTSE”). The Underlying Index measures the performance of securities of international developed market small-capitalization companies, excluding the U.S. and Korea, with prominent value factor characteristics, as determined by the Index Provider. The Underlying Index is a subset of the FTSE Developed ex US ex Korea Small Cap Index (the “Parent Index”), which measures the performance of the small-capitalization segment of the international developed equity market, excluding the U.S. and Korea, as defined by the Index Provider.

The construction of the Underlying Index begins with the Parent Index and excludes companies that are ranked in the least liquid 20% based on the 60-day average dollar value traded. The list of eligible constituents is then narrowed to exclude the top 20% of Parent Index constituents with the highest risk based on a 12-month trailing realized volatility. The list is further narrowed to exclude the top 20% of Parent Index constituents with the highest leverage, which is measured by comparing a company’s total debt to its total assets.

Following these three initial screens, the remaining companies are evaluated to exclude companies with a negative sentiment score and negative price momentum. The sentiment score is calculated using the number of upgrades for earnings per share and the number of downgrades for earnings per share for a company's current and next fiscal year. A company with more downgrades for earnings per share than upgrades will have a negative sentiment score. Negative price momentum is determined based on monthly price returns over the trailing 12 months, excluding the latest month.

The remaining companies are then ranked based on a weighted composite score of three value factor metrics: price-to-book, price-to-earnings and price-to-cash flow from operations (the “Composite Score”). The number of securities in the Underlying Index is approximately 25% of the number of securities in the Parent Index. The selected securities are weighted in proportion to their float-adjusted market capitalization with a country constraint of +/- 10% relative to the Parent Index to form a baseline or target composition (the “Target Index”).

The Underlying Index is reviewed monthly and rebalanced to the Target Index if either of the following conditions is met: (i) the Underlying Index’s Composite Score is less than 90% of the Target Index’s Composite Score; or (ii) the Underlying Index has fewer than 20% of the number of securities by count of the Parent Index. If no rebalance is triggered, the component securities of the Underlying Index and their weights will remain unchanged. The Underlying Index may not rebalance for a period of time and is typically composed of 450 - 550 components.

As of March 31, 2026, a significant portion of the Underlying Index was represented by securities of companies in the consumer goods and services, financials and industrials industries or sectors. The components of the Underlying Index are likely to change over time. As of March 31, 2026, the Underlying Index had 499 components.

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.