S000005358 [Member] Annual Total Returns |
12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| EMERGING MARKETS EQUITY INDEX FUND | EMERGING MARKETS EQUITY INDEX FUND | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 33.65% | 7.10% | 9.15% | (20.48%) | (3.35%) | 17.61% | 18.32% | (15.04%) | 37.34% | 10.63% |