v3.25.2
Shareholder Report, Holdings (Details) - C000253542
Apr. 30, 2025
State Street Institutional US Government Money Market FundFR_924QSGII3_4.341201_2030-12-31  
Holdings [Line Items]  
Percent of Net Asset Value 86.90%
U.S. Treasury BillsFR_912797NN3  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
U.S. Treasury BillsFR_912797NP8  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
U.S. Treasury BillsFR_912797LB1  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
U.S. Treasury BillsFR_912797PE1  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
U.S. Treasury Bills, Zero CouponFR_912797ND5  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Bloomberg Enhanced Roll Yield Index Total Return SwapFR_99S26Y2F3  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Bloomberg Enhanced Roll Yield Index Total Return SwapFR_99S26YO69  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Bloomberg Enhanced Roll Yield Index Total Return SwapFR_99S27RSF9  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Bloomberg Enhanced Roll Yield Index Total Return SwapFR_99S27TPF8  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%