v3.26.1
S000005358 [Member] Expense Example - EMERGING MARKETS EQUITY INDEX FUND - EMERGING MARKETS EQUITY INDEX FUND
Mar. 31, 2026
USD ($)
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 15
Expense Example, with Redemption, 3 Years 75
Expense Example, with Redemption, 5 Years 140
Expense Example, with Redemption, 10 Years $ 331