Investor P Shares [Member] Investment Objectives and Goals - Investor P - iShares Russell 2000 Small-Cap Index Fund |
Dec. 31, 2025 |
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| Prospectus [Line Items] | |
| Risk/Return [Heading] | Fund OverviewKey Facts About iShares Russell 2000 Small-Cap Index Fund |
| Objective [Heading] | Investment Objective |
| Objective, Primary [Text Block] | The investment objective of iShares Russell 2000 Small-Cap Index Fund (“Russell 2000 Small-Cap Index Fund” or the “Fund”), a series of BlackRock Index Funds, Inc. (the “Corporation”), is to match the performance of the Russell 2000® Index (the “Russell 2000” or the “Underlying Index”) as closely as possible before the deduction of Fund expenses.
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