v3.26.1
State Street Federal Treasury Money Market Fund Expense Example - State Street Federal Treasury Money Market Fund
Sep. 04, 2026
USD ($)
Preferred Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 12
Expense Example, with Redemption, 3 Years 39
Expense Example, with Redemption, 5 Years 68
Expense Example, with Redemption, 10 Years 154
Capital Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 18
Expense Example, with Redemption, 3 Years 58
Expense Example, with Redemption, 5 Years 101
Expense Example, with Redemption, 10 Years 230
Agency Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 26
Expense Example, with Redemption, 3 Years 80
Expense Example, with Redemption, 5 Years 141
Expense Example, with Redemption, 10 Years 318
Advisory Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 36
Expense Example, with Redemption, 3 Years 113
Expense Example, with Redemption, 5 Years 197
Expense Example, with Redemption, 10 Years 443
Advantage Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 45
Expense Example, with Redemption, 3 Years 141
Expense Example, with Redemption, 5 Years 246
Expense Example, with Redemption, 10 Years $ 555