State Street Moderately Aggressive ETF Portfolio Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|
| MSCI All Country World Index (reflects no deduction for mutual fund fees or expenses)[Member] | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 22.34% | 11.19% | 11.72% |
| State Street Moderately Aggressive Composite Index (reflects no deduction for mutual fund fees or expenses)[Member] | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 19.02% | 8.86% | 9.75% |
| Class A | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 19.53% | 9.28% | 9.58% |
| Class B | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 19.23% | 9.01% | 9.31% |
| Class E | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 19.29% | 9.11% | 9.41% |