S000005358 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|
| MSCI Emerging Markets Index (reflects no deduction for fees, expenses, or taxes) | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 33.57% | 4.20% | 8.42% |
| EMERGING MARKETS EQUITY INDEX FUND | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 33.65% | 3.72% | 7.99% |
| EMERGING MARKETS EQUITY INDEX FUND | After Taxes on Distributions | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 32.71% | 2.92% | 7.25% |
| EMERGING MARKETS EQUITY INDEX FUND | After Taxes on Distributions and Sales | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 20.34% | 2.66% | 6.29% |