v3.26.1
Average Annual Total Returns - Morgan Stanley U.S. Government Money Market Trust - Classes R and S - U.S. Government Money Market Trust
12 Months Ended 60 Months Ended 114 Months Ended 120 Months Ended 526 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
[1]
Dec. 31, 2025
Dec. 31, 2025
[1]
R          
Prospectus [Line Items]          
Average Annual Return, Percent 4.00% 3.01%   1.92% 3.40%
S          
Prospectus [Line Items]          
Average Annual Return, Percent 4.00% 3.02% 2.02%    
[1]
* R Class commenced operations on February 17, 1982 and S Class commenced operations on June 28, 2016.