Investor A Institutional [Member] Investment Objectives and Goals - Investor A, Institutional - iShares MSCI EAFE International Index Fund |
Dec. 31, 2025 |
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| Prospectus [Line Items] | |
| Risk/Return [Heading] | Fund Overview Key Facts About iShares MSCI EAFE International Index Fund |
| Objective [Heading] | Investment Objective |
| Objective, Primary [Text Block] | The investment objective of iShares MSCI EAFE International Index Fund (“MSCI EAFE International Index Fund”or the “Fund”), a series of BlackRock Index Funds, Inc. (the “Corporation”), is to match the performance of the MSCI EAFE Index (Europe, Australasia, Far East) (the “MSCI EAFE Index” or the “Underlying Index”) in U.S. dollars with net dividends as closely as possible before the deduction of Fund expenses.
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