JPMorgan National Municipal Income Fund Performance Management - R6 Shares [Member] - JPMorgan National Municipal Income Fund |
Feb. 28, 2025 |
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| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | <span style="color:#000000;font-family:Arial Narrow;font-size:11pt;font-weight:bold;">The Fund’s Past Performance</span> |
| Performance Narrative [Text Block] | This section provides some indication of the risks of investing in the Fund. The bar chart shows how the performance of the Fund’s Class R6 Shares has varied from year to year for the past ten calendar years. The table shows the average annual total returns over the past one year, five years and ten years. The table compares the Fund’s performance to the performance of the Bloomberg U.S. 1-15 Year Blend (1-17) Municipal Bond Index and the Bloomberg US Municipal Index. The performance of the Class R6 Shares prior to their inception are based on Class I Shares (which are not offered in this prospectus). The actual returns of the Class R6 Shares would be substantially similar to the performance of Class I Shares because the Fund is invested in the same group of securities and the annual returns would differ only to the extent that the Classes do not have the same expenses. 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 visiting www.jpmorganfunds.com or by calling 1-800-480-4111. |
| Performance Past Does Not Indicate Future [Text] | <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;">Past performance (before and after taxes) is not </span><span style="color:#000000;font-family:Arial Narrow;font-size:10pt;">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 Narrow;font-size:10pt;">The bar chart shows how the performance of the </span><span style="color:#000000;font-family:Arial Narrow;font-size:10pt;">Fund’s Class R6 Shares has varied from year to year for the past ten calendar years. The table shows the average annual total returns over the past one year, five years and ten years.</span> |
| Bar Chart [Heading] | <span style="color:#FFFFFF;font-family:Arial Narrow;font-size:10pt;font-weight:bold;margin-left:0.0pt;">YEAR-BY-YEAR RETURNS — CLASS R6 SHARES</span> |
| Bar Chart Closing [Text Block] | Best Quarter4th quarter, 20236.34%Worst Quarter1st quarter, 2022-5.74%The Fund’s year-to-date total returnthrough3/31/25was0.14%. |
| Performance Table Heading | <span style="color:#FFFFFF;font-family:Arial Narrow;font-size:11pt;font-weight:bold;margin-left:0.0pt;">AVERAGE ANNUAL TOTAL RETURNS</span><span style="color:#FFFFFF;font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:0.0pt;">(For periods ended December 31, 2024)</span> |
| Performance Table Narrative | After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. |
| Performance Table Uses Highest Federal Rate | <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;">After-tax returns are calculated using the historical highest 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 Narrow;font-size:10pt;"> Actual after-tax returns </span><span style="color:#000000;font-family:Arial Narrow;font-size:10pt;">depend on the investor’s tax situation and may differ from </span><span style="color:#000000;font-family:Arial Narrow;font-size:10pt;">those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.</span> |
| Performance Availability Website Address [Text] | <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-style:italic;">www.jpmorganfunds.com</span> |
| Performance Availability Phone [Text] | <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-style:italic;">1-800-480-4111</span> |
| Class R6 | |
| Prospectus [Line Items] | |
| Year to Date Return, Label [Optional Text] | <span style="font-family:Arial Narrow;font-size:9pt;margin-left:0.0pt;">The Fund’s year-to-date total return</span> |
| Bar Chart, Year to Date Return | 0.14% |
| Bar Chart, Year to Date Return, Date | Mar. 31, 2025 |
| Highest Quarterly Return, Label [Optional Text] | <span style="color:#000000;font-family:Arial Narrow;font-size:9pt;font-weight:bold;margin-left:0.0pt;">Best Quarter</span> |
| Highest Quarterly Return | 6.34% |
| Highest Quarterly Return, Date | Dec. 31, 2023 |
| Lowest Quarterly Return, Label [Optional Text] | <span style="color:#000000;font-family:Arial Narrow;font-size:9pt;font-weight:bold;margin-left:0.0pt;">Worst Quarter</span> |
| Lowest Quarterly Return | (5.74%) |
| Lowest Quarterly Return, Date | Mar. 31, 2022 |