S000069558 [Member] Performance Management - iShares 25+ Year Treasury STRIPS Bond ETF |
Feb. 28, 2025 |
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| Prospectus [Line Items] | ||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance Information | |||||||||||||||
| Performance Narrative [Text Block] | The performance information below illustrates how the Fund’s performance has varied over different periods and provides some indication of the risks of investing in the Fund. The bar chart shows how the performance of the Fund has varied from one calendar year to another over the periods shown. The table compares the Fund’s performance to that of an appropriate broad-based securities market index and the Underlying Index. Fund returns assume the reinvestment of any dividends and distributions. The Fund’s returns reflect the impact of any agreements to waive or reimburse expenses, which would reduce performance if not in effect. Past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. Updated performance information, including the Fund’s current NAV, may be obtained by visiting www.iShares.com or by calling 1-800-iShares (1-800-474-2737) (toll free).
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| Performance Past Does Not Indicate Future [Text] | Past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. | |||||||||||||||
| Performance Information Illustrates Variability of Returns [Text] | The performance information below illustrates how the Fund’s performance has varied over different periods and provides some indication of the risks of investing in the Fund. The bar chart shows how the performance of the Fund has varied from one calendar year to another over the periods shown. The table compares the Fund’s performance to that of an appropriate broad-based securities market indexand the Underlying Index. | |||||||||||||||
| Bar Chart [Heading] | Calendar Year-by-Year Returns | |||||||||||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns(for the periods ended December 31, 2024) | |||||||||||||||
| Performance Table Narrative | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to tax-exempt investors or investors who hold shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”). Fund returns after taxes on distributions and sales of Fund shares are calculated assuming that an investor has sufficient capital gains of the same character from other investments to offset any capital losses from the sales of Fund shares. As a result, Fund returns after taxes on distributions and sales of Fund shares may exceed Fund returns before taxes and/or returns after taxes on distributions.
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| Performance Table Uses Highest Federal Rate | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. | |||||||||||||||
| Performance Table Not Relevant to Tax Deferred | Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to tax-exempt investors or investors who hold shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”). | |||||||||||||||
| Performance Table Explanation after Tax Higher | Fund returns after taxes on distributions and sales of Fund shares are calculated assuming that an investor has sufficient capital gains of the same character from other investments to offset any capital losses from the sales of Fund shares. As a result, Fund returns after taxes on distributions and sales of Fund shares may exceed Fund returns before taxes and/or returns after taxes on distributions. | |||||||||||||||
| Performance Availability Website Address [Text] | www.iShares.com | |||||||||||||||
| Performance Availability Phone [Text] | 1-800-iShares (1-800-474-2737) (toll free) | |||||||||||||||
| iShares 25+ Year Treasury STRIPS Bond ETF | ||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||
| Year to Date Return, Label [Optional Text] | Calendar Year-to-Date Return | |||||||||||||||
| Bar Chart, Year to Date Return | 4.56% | |||||||||||||||
| Bar Chart, Year to Date Return, Date | Mar. 31, 2025 | |||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | |||||||||||||||
| Highest Quarterly Return | 18.81% | |||||||||||||||
| Highest Quarterly Return, Date | Dec. 31, 2023 | |||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | |||||||||||||||
| Lowest Quarterly Return | (20.13%) | |||||||||||||||
| Lowest Quarterly Return, Date | Sep. 30, 2023 | |||||||||||||||