State Street SPDR Nuveen ICE Short Term Municipal Bond ETF Performance Management - State Street SPDR Nuveen ICE Short Term Municipal Bond ETF |
Jun. 30, 2026 |
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| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;text-transform:uppercase;">Fund Performance</span> |
| Performance Narrative [Text Block] | The following bar chart and table provide an indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for certain time periods compare with the average annual returns of the Index and of a relevant broad-based securities index. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available by calling 1-866-787-2257 or visiting our website at www.statestreet.com/im. |
| Performance Past Does Not Indicate Future [Text] | <span style="color:#000000;font-family:Arial;font-size:10pt;">The </span><span style="color:#000000;font-family:Arial;font-size:10pt;">Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.</span> |
| Performance Information Illustrates Variability of Returns [Text] | <span style="color:#000000;font-family:Arial;font-size:10pt;">The following bar chart and table provide an indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for certain time periods compare with the average annual returns of the Index and of a relevant broad-based securities index. </span> |
| Bar Chart [Heading] | <span style="color:#000000;font-family:Arial;font-size:8pt;font-weight:bold;text-transform:uppercase;">Annual Total Returns </span><span style="color:#000000;font-family:Arial;font-size:8pt;">(years ended 12/31)</span> |
| Bar Chart Closing [Text Block] | ReturnsQuarter/YearHighest Quarterly Return3.83%Q4 2023Lowest Quarterly Return-3.70%Q1 2022Year-to-Date-1.00%9/30/2026 |
| Performance Table Heading | <span style="color:#000000;font-family:Arial;font-size:8pt;font-weight:bold;text-transform:uppercase;">Average Annual Total Returns </span><span style="color:#000000;font-family:Arial;font-size:8pt;">(for periods ended 12/31/25)</span> |
| Performance Table Narrative | The after-tax returns presented in the table below are calculated using highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your specific tax situation and may differ from those shown below. After-tax returns are not relevant to investors who hold Fund Shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts. The returns after taxes can exceed the returns before taxes due to an assumed tax benefit for a shareholder from realizing a capital loss on a sale of Fund Shares. Effective June 1, 2025 (the “Benchmark Index Change Date”), the Fund's benchmark index changed from the Bloomberg Managed Money Municipal Short Term Index (the “Previous Benchmark Index”) to the ICE 1-5 Year AMT-Free Broad Municipal Index, consistent with a change in the Fund's principal investment strategy to track the performance of the current index. Performance of the Fund shown below is therefore based on the Fund's investment strategy to track the Previous Benchmark Index and may have been different had the Fund tracked the current index. |
| Performance Table Uses Highest Federal Rate | <span style="color:#000000;font-family:Arial;font-size:10pt;">The after-tax returns presented in the table below are calculated using highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes. </span> |
| Performance Table Not Relevant to Tax Deferred | <span style="color:#000000;font-family:Arial;font-size:10pt;">Your actual after-tax returns will depend on </span><span style="color:#000000;font-family:Arial;font-size:10pt;">your specific tax situation and may differ from those shown below. After-tax returns are not relevant to investors who hold Fund Shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts. </span> |
| Performance Table Explanation after Tax Higher | <span style="color:#000000;font-family:Arial;font-size:10pt;">The </span><span style="color:#000000;font-family:Arial;font-size:10pt;">returns after taxes can exceed the returns before taxes due to an assumed tax benefit for a shareholder from realizing a capital loss on a sale of Fund Shares.</span> |
| Performance Availability Website Address [Text] | <span style="color:#000000;font-family:Arial;font-size:10pt;">www.statestreet.com/im</span> |
| Performance Availability Phone [Text] | <span style="color:#000000;font-family:Arial;font-size:10pt;">1-866-787-2257</span> |
| State Street SPDR Nuveen ICE Short Term Municipal Bond ETF | |
| Prospectus [Line Items] | |
| Year to Date Return, Label [Optional Text] | <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;margin-left:0.0pt;">Year-to-Date</span> |
| Bar Chart, Year to Date Return | (1.00%) |
| Bar Chart, Year to Date Return, Date | Sep. 30, 2026 |
| Highest Quarterly Return, Label [Optional Text] | <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;margin-left:0.0pt;">Highest Quarterly Return</span> |
| Highest Quarterly Return | 3.83% |
| Highest Quarterly Return, Date | Dec. 31, 2023 |
| Lowest Quarterly Return, Label [Optional Text] | <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;margin-left:0.0pt;">Lowest Quarterly Return</span> |
| Lowest Quarterly Return | (3.70%) |
| Lowest Quarterly Return, Date | Mar. 31, 2022 |