v3.26.1
State Street Income VIS Fund Expense Example - State Street Income VIS Fund - Class 1
Dec. 31, 2025
USD ($)
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 164
Expense Example, with Redemption, 3 Years 510
Expense Example, with Redemption, 5 Years 880
Expense Example, with Redemption, 10 Years $ 1,921