Investor A Institutional [Member] Investment Objectives and Goals - Investor A Shares Institutional Shares - iShares MSCI Total International Index Fund |
Dec. 31, 2025 |
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| Prospectus [Line Items] | |
| Risk/Return [Heading] | Fund OverviewKey Facts About iShares MSCI Total International Index Fund |
| Objective [Heading] | Investment Objective |
| Objective, Primary [Text Block] | The investment objective of iShares MSCI Total International Index Fund (“Total International Index Fund” or the “Fund”), a series of BlackRock Funds III (the “Trust”), is to match the performance of the MSCI All Country World Index ex USA Index (the “MSCI ACWI ex USA 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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