v3.26.1
State Street Moderate ETF Portfolio Investment Objectives and Goals - State Street Moderate ETF Portfolio
Dec. 31, 2025
Prospectus [Line Items]  
Risk/Return [Heading] <span style="font-family:Times New Roman;font-size:22pt;">State Street Moderate ETF Portfolio </span><span style="font-family:Times New Roman;font-size:13pt;font-weight:bold;">(formerly, SSGA Growth and Income ETF Portfolio)</span>
Objective [Heading] <span style="color:#000000;font-family:Times New Roman;font-size:11.5pt;font-weight:bold;">Investment Objectives</span>
Objective, Primary [Text Block] Growth of capital and income.