JPMorgan California Municipal Money Market Fund Performance Management - Premier Shares [Member] - JPMorgan California Municipal Money Market Fund |
Feb. 28, 2026 |
|---|---|
| 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 Premier 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 performance of Premier Shares shown in the table is based on the performance of the Morgan Shares (which are not offered in this prospectus) before the inception of Premier Shares. The returns would differ only to the extent that the classes have different expense ratios. To obtain current yield information call 1-800-766-7722. Past performance is not necessarily an indication of how the Fund will perform in the future. |
| Performance Past Does Not Indicate Future [Text] | <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;">Past </span><span style="color:#000000;font-family:Arial Narrow;font-size:10pt;">performance 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 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 Premier 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</span> |
| Bar Chart Closing [Text Block] | Best Quarter0.77%Worst Quarter1Q and 2Q 20163Q 20201Q, 2Q and 3Q 20210.00%The Fund’s year-to-date total returnthrough3/31/26was0.36%. |
| 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, 2025)</span> |
| Performance Availability Phone [Text] | <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;">1-800-766-7722</span> |
| Premier | |
| 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 | 0.36% |
| Bar Chart, Year to Date Return, Date | Mar. 31, 2026 |
| Highest Quarterly Return, Label [Optional Text] | <span style="font-family:Arial Narrow;font-size:9pt;font-weight:bold;margin-left:0.0pt;">Best Quarter</span> |
| Highest Quarterly Return | 0.77% |
| Highest Quarterly Return, Date | Jun. 30, 2024 |
| Lowest Quarterly Return, Label [Optional Text] | <span style="font-family:Arial Narrow;font-size:9pt;font-weight:bold;margin-left:0.0pt;">Worst Quarter</span> |
| Lowest Quarterly Return | none |
| Lowest Quarterly Return, Date | Mar. 31, 2022 |