v3.25.4
Performance Management - Morgan Stanley Institutional Liquidity Funds - MSILF Treasury Securities Portfolio
Oct. 31, 2025
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] Performance Information
Performance Narrative [Text Block]
The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the performance of the Fund’s Institutional Class shares from year-to-year and by showing the average annual returns of the Fund’s Institutional Class shares for the one, five and 10 year periods. The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available online at www.morganstanley.com/liquidity.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the performance of the Fund’s Institutional Class shares from year-to-year and by showing the average annual returns of the Fund’s Institutional Class shares for the one, five and 10 year periods.
Bar Chart [Heading] Annual Total Returns—Calendar Years
Bar Chart [Table]
image
Bar Chart Closing [Text Block]
High Quarter
12/31/23
1.32%
Low Quarter
03/31/21
0.00%
Performance Table Heading Average Annual Total Returns(for the Periods Ended  December 31, 2025)
Performance [Table]
 
Past
One Year
Past Five
Years
Past
Ten Years
Treasury Securities Portfolio1
4.13%
3.10%
2.04%
[1]
Performance Table Closing [Text Block]
You may obtain the Fund’s 7-day current yield by calling 1-888-378-1630.
Money Market Seven Day Yield Phone 1-888-378-1630
Performance Availability Website Address [Text] www.morganstanley.com/liquidity
DAP  
Prospectus [Line Items]  
Highest Quarterly Return, Label [Optional Text] High Quarter
Highest Quarterly Return 1.32%
Highest Quarterly Return, Date Dec. 31, 2023
Lowest Quarterly Return, Label [Optional Text] Low Quarter
Lowest Quarterly Return none
Lowest Quarterly Return, Date Mar. 31, 2021
[1]
1 Institutional Class shares are not offered in this Prospectus. DAP Class shares of the Fund had not completed a full calendar year of operations as of December 31, 2025 and therefore DAP Class shares do not have annualized return information to report. DAP Class shares would have substantially similar annual returns because the shares are invested in the same portfolio of securities and the annual returns would differ only to the extent that the Classes do not have the same expenses. Return information for the Fund’s DAP Class shares will be shown in future prospectuses offering the Fund’s DAP Class shares after the Fund’s DAP Class shares have a full calendar year of return information to report.