S000013696 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended | 228 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 10-20 Year Bond Index (Spliced) (Returns do not reflect deductions for fees, expenses or taxes) | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | [1] | 6.53% | (5.57%) | (0.05%) | ||
| iShares 10-20 Year Treasury Bond ETF | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | 6.39% | (5.60%) | (0.10%) | |||
| Performance Inception Date | Jan. 05, 2007 | |||||
| iShares 10-20 Year Treasury Bond ETF | After Taxes on Distributions | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | 4.61% | (6.84%) | (1.19%) | |||
| iShares 10-20 Year Treasury Bond ETF | After Taxes on Distributions and Sales | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | 3.77% | (4.62%) | (0.49%) | |||
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