S000012717 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|
| MSCI® World Index (reflects no deduction for fees, expenses, or taxes) | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 21.09% | 12.15% | 12.17% |
| MSCI® ACWI IMI Core Real Estate Index (reflects no deduction for fees, expenses, or taxes) | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 9.86% | 2.57% | 3.45% |
| GLOBAL REAL ESTATE INDEX FUND | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 10.42% | 2.99% | 3.83% |
| GLOBAL REAL ESTATE INDEX FUND | After Taxes on Distributions | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 8.68% | 1.97% | 2.67% |
| GLOBAL REAL ESTATE INDEX FUND | After Taxes on Distributions and Sales | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 6.15% | 1.98% | 2.52% |