v3.26.1
State Street Federal Government Money Market Fund Annual Fund Operating Expenses - State Street Federal Government Money Market Fund
Sep. 04, 2026
Preferred Class  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.05%
Distribution and Service (12b-1) Fees 0.00%
Component1 Other Expenses 0.07% [1]
Component2 Other Expenses 0.00% [1]
Other Expenses (as a percentage of Assets): 0.07%
Expenses (as a percentage of Assets) 0.12%
Capital Class  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.05%
Distribution and Service (12b-1) Fees 0.00%
Component1 Other Expenses 0.13% [1]
Component2 Other Expenses 0.00% [1]
Other Expenses (as a percentage of Assets): 0.13%
Expenses (as a percentage of Assets) 0.18%
Agency Class  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.05%
Distribution and Service (12b-1) Fees 0.00%
Component1 Other Expenses 0.15% [1]
Component2 Other Expenses 0.05% [1]
Other Expenses (as a percentage of Assets): 0.20%
Expenses (as a percentage of Assets) 0.25%
Advisory Class  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.05%
Distribution and Service (12b-1) Fees 0.00%
Component1 Other Expenses 0.15% [1]
Component2 Other Expenses 0.15% [1]
Other Expenses (as a percentage of Assets): 0.30%
Expenses (as a percentage of Assets) 0.35%
Advantage Class  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.05%
Distribution and Service (12b-1) Fees 0.00%
Component1 Other Expenses 0.14% [1]
Component2 Other Expenses 0.25% [1]
Other Expenses (as a percentage of Assets): 0.39%
Expenses (as a percentage of Assets) 0.44%
[1] Other Expenses for each of the Preferred Class, Capital Class, Agency Class, and Advisory Class shares are based on estimates for the current fiscal year.