State Street Moderate 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 Moderate Composite Index (reflects no deduction for mutual fund fees or expenses)[Member] | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 16.05% | 7.04% | 8.28% |
| Class A | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 17.09% | 7.46% | 8.13% |
| Class B | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 16.78% | 7.19% | 7.85% |
| Class E | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 16.93% | 7.30% | 7.96% |