S000004357 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended | 281 Months Ended | ||
|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
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| ICE BofA US Broad Market Index (Returns do not reflect deductions for fees, expenses or taxes) | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | 7.15% | (0.42%) | 2.01% | |||
| ICE U.S. Treasury 1-3 Year Bond Index (Spliced) (Returns do not reflect deductions for fees, expenses or taxes) | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | [1] | 5.14% | 1.74% | 1.83% | ||
| iShares 1-3 Year Treasury Bond ETF | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | 5.00% | 1.63% | 1.70% | |||
| Performance Inception Date | Jul. 22, 2002 | |||||
| iShares 1-3 Year Treasury Bond ETF | After Taxes on Distributions | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | 3.38% | 0.62% | 0.92% | |||
| iShares 1-3 Year Treasury Bond ETF | After Taxes on Distributions and Sales | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | 2.94% | 0.80% | 0.96% | |||
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