| Form N-CSR Cover | 6 Months Ended |
| Aug. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | iShares Trust |
| Entity Central Index Key | 0001100663 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Aug. 31, 2024 |
| Shareholder Report | 6 Months Ended |
| Aug. 31, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | iShares Trust |
| Entity Central Index Key | 0001100663 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Aug. 31, 2024 |
| C000219740 | |
| Shareholder Report [Line Items] | |
| Fund Name | iShares 0-3 Month Treasury Bond ETF |
| Trading Symbol | SGOV |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about iShares 0-3 Month Treasury Bond ETF (the “Fund”) for the period of March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports |
| Additional Information Phone Number | 1-800-iShares (1-800-474-2737) |
| Additional Information Website | <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-B19"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span> |
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares 0-3 Month Treasury Bond ETF $4 0.08% Footnote Reference Footnote Description Footnote (a) Annualized. |
| Expenses Paid, Amount | $ 4 |
| Expense Ratio, Percent | 0.08% |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results.</span>" id="sjs-B23"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">Past performance is not an indication of future results.</span> |
| Average Annual Return [Table Text Block] | Fund performance Average annual total returns Average Annual Total Returns 6-Month Total Returns 1 Year Since Fund Inception Fund NAV ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.74 % 5.50 % 2.42 % Fund Market ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.68 5.43 2.41 ICE BofA US Broad Market Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.85 7.35 (1.15 ) ICE ® ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.13 4.31 1.89 |
| Performance Inception Date | May 26, 2020 |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. |
| Updated Performance Information Location [Text Block] | Visit iShares.com |
| AssetsNet | $ 24,701,232,310 |
| Holdings Count | Holding | 19 |
| InvestmentCompanyPortfolioTurnover | 0% |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $24,701,232,310 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 19 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ -% |
| Holdings [Text Block] | Maturity allocation Ten largest holdings Maturity Percent of TotaI Investments Footnote Reference 0-1 Year ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 100.0 % Security Percent of Total Investments Footnote Reference U.S. Treasury Bills, 5.30%, 09/17/24 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 13.2 % U.S. Treasury Bills, 5.21%, 10/29/24 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 11.0 U.S. Treasury Bills, 5.31%, 09/03/24 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 11.0 U.S. Treasury Bills, 5.27%, 10/01/24 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.8 U.S. Treasury Bills, 5.30%, 09/24/24 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.2 U.S. Treasury Bills, 5.17%, 10/22/24 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.0 U.S. Treasury Bills, 5.21%, 10/15/24 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.4 U.S. Treasury Bills, 5.12%, 11/21/24 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.3 U.S. Treasury Bills, 5.27%, 10/03/24 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.2 U.S. Treasury Bills, 5.31%, 09/12/24 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.7 Footnote Description Footnote (a) Excludes money market funds. |
| C000012087 | |
| Shareholder Report [Line Items] | |
| Fund Name | iShares 1-3 Year Treasury Bond ETF |
| Trading Symbol | SHY |
| Security Exchange Name | NASDAQ |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about iShares 1-3 Year Treasury Bond ETF (the “Fund”) for the period of March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports |
| Additional Information Phone Number | 1-800-iShares (1-800-474-2737) |
| Additional Information Website | <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-B42"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span> |
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares 1-3 Year Treasury Bond ETF $8 0.15% Footnote Reference Footnote Description Footnote (a) Annualized. |
| Expenses Paid, Amount | $ 8 |
| Expense Ratio, Percent | 0.15% |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results.</span>" id="sjs-B46"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">Past performance is not an indication of future results.</span> |
| Average Annual Return [Table Text Block] | Fund performance Average annual total returns Average Annual Total Returns 6-Month Total Returns 1 Year 5 Years 10 Years Fund NAV ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.28 % 5.73 % 1.17 % 1.19 % Fund Market ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.27 5.70 1.17 1.19 ICE BofA US Broad Market Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.85 7.35 (0.08 ) 1.67 ICE ® ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.35 5.88 1.29 1.32 |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. |
| Updated Performance Information Location [Text Block] | Visit iShares.com |
| AssetsNet | $ 23,732,751,406 |
| Holdings Count | Holding | 118 |
| InvestmentCompanyPortfolioTurnover | 27% |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $23,732,751,406 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 118 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 27% |
| Holdings [Text Block] | Maturity allocation Ten largest holdings Maturity Percent of TotaI Investments Footnote Reference 0-1 Year ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.9 % 1-2 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 54.6 2-3 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 44.5 Security Percent of Total Investments Footnote Reference U.S. Treasury Notes, 4.00%, 02/15/26 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.9 % U.S. Treasury Notes, 4.50%, 11/15/25 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.0 U.S. Treasury Notes, 4.00%, 12/15/25 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.6 U.S. Treasury Notes, 3.88%, 01/15/26 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.2 U.S. Treasury Notes, 0.75%, 05/31/26 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.5 U.S. Treasury Notes, 4.63%, 02/28/26 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.4 U.S. Treasury Notes, 4.00%, 01/15/27 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.4 U.S. Treasury Notes, 4.25%, 03/15/27 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.2 U.S. Treasury Notes, 2.25%, 11/15/25 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.0 U.S. Treasury Notes, 4.50%, 05/15/27 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.9 Footnote Description Footnote (a) Excludes money market funds. |
| C000037537 | |
| Shareholder Report [Line Items] | |
| Fund Name | iShares 3-7 Year Treasury Bond ETF |
| Trading Symbol | IEI |
| Security Exchange Name | NASDAQ |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about iShares 3-7 Year Treasury Bond ETF (the “Fund”) for the period of March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports |
| Additional Information Phone Number | 1-800-iShares (1-800-474-2737) |
| Additional Information Website | <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-B64"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span> |
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares 3-7 Year Treasury Bond ETF $8 0.15% Footnote Reference Footnote Description Footnote (a) Annualized. |
| Expenses Paid, Amount | $ 8 |
| Expense Ratio, Percent | 0.15% |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results.</span>" id="sjs-B68"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">Past performance is not an indication of future results.</span> |
| Average Annual Return [Table Text Block] | Fund performance Average annual total returns Average Annual Total Returns 6-Month Total Returns 1 Year 5 Years 10 Years Fund NAV ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.36 % 6.48 % 0.16 % 1.34 % Fund Market ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.31 6.45 0.15 1.34 ICE BofA US Broad Market Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.85 7.35 (0.08 ) 1.67 ICE ® ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.43 6.61 0.29 1.46 |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. |
| Updated Performance Information Location [Text Block] | Visit iShares.com |
| AssetsNet | $ 14,954,384,272 |
| Holdings Count | Holding | 90 |
| InvestmentCompanyPortfolioTurnover | 19% |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $14,954,384,272 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 90 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 19% |
| Holdings [Text Block] | Maturity allocation Ten largest holdings Maturity Percent of TotaI Investments Footnote Reference 2-3 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.4 % 3-4 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 28.0 4-5 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 32.3 5-6 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 19.3 6-7 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 19.0 Security Percent of Total Investments Footnote Reference U.S. Treasury Notes, 2.63%, 02/15/29 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.0 % U.S. Treasury Notes, 4.38%, 11/30/30 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.7 U.S. Treasury Notes, 1.38%, 10/31/28 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.6 U.S. Treasury Notes, 1.25%, 09/30/28 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.4 U.S. Treasury Notes, 1.00%, 07/31/28 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.1 U.S. Treasury Notes, 2.88%, 08/15/28 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.1 U.S. Treasury Notes, 2.38%, 05/15/29 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.9 U.S. Treasury Notes, 3.13%, 11/15/28 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.9 U.S. Treasury Notes, 2.75%, 02/15/28 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.5 U.S. Treasury Notes, 4.13%, 08/31/30 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.3 Footnote Description Footnote (a) Excludes money market funds. |
| C000012088 | |
| Shareholder Report [Line Items] | |
| Fund Name | iShares 7-10 Year Treasury Bond ETF |
| Trading Symbol | IEF |
| Security Exchange Name | NASDAQ |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about iShares 7-10 Year Treasury Bond ETF (the “Fund”) for the period of March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports |
| Additional Information Phone Number | 1-800-iShares (1-800-474-2737) |
| Additional Information Website | <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-B86"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span> |
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares 7-10 Year Treasury Bond ETF $8 0.15% Footnote Reference Footnote Description Footnote (a) Annualized. |
| Expenses Paid, Amount | $ 8 |
| Expense Ratio, Percent | 0.15% |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results.</span>" id="sjs-B90"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">Past performance is not an indication of future results.</span> |
| Average Annual Return [Table Text Block] | Fund performance Average annual total returns Average Annual Total Returns 6-Month Total Returns 1 Year 5 Years 10 Years Fund NAV ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.95 % 5.96 % (1.30 )% 1.17 % Fund Market ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.85 5.88 (1.32 ) 1.17 ICE BofA US Broad Market Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.85 7.35 (0.08 ) 1.67 ICE ® ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.02 6.08 (1.18 ) 1.28 |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. |
| Updated Performance Information Location [Text Block] | Visit iShares.com |
| AssetsNet | $ 31,852,528,535 |
| Holdings Count | Holding | 20 |
| InvestmentCompanyPortfolioTurnover | 34% |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $31,852,528,535 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 20 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 34% |
| Holdings [Text Block] | Maturity allocation Ten largest holdings Maturity Percent of TotaI Investments Footnote Reference 5-6 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.0 % Footnote Reference 6-7 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.1 7-8 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 27.1 8-9 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 32.9 9-10 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 35.9 Security Percent of Total Investments Footnote Reference U.S. Treasury Notes, 4.00%, 02/15/34 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 11.5 % U.S. Treasury Notes, 4.50%, 11/15/33 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.4 U.S. Treasury Notes, 4.38%, 05/15/34 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.5 U.S. Treasury Notes, 3.88%, 08/15/33 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.1 U.S. Treasury Notes, 1.88%, 02/15/32 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.6 U.S. Treasury Notes, 3.38%, 05/15/33 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.5 U.S. Treasury Notes, 3.50%, 02/15/33 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.0 U.S. Treasury Notes, 2.88%, 05/15/32 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.0 U.S. Treasury Notes, 1.38%, 11/15/31 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.7 U.S. Treasury Notes, 4.13%, 11/15/32 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.2 Footnote Description Footnote (a) Excludes money market funds. Footnote (b) Rounds to less than 0.1%. |
| C000037538 | |
| Shareholder Report [Line Items] | |
| Fund Name | iShares 10-20 Year Treasury Bond ETF |
| Trading Symbol | TLH |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about iShares 10-20 Year Treasury Bond ETF (the “Fund”) for the period of March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports |
| Additional Information Phone Number | 1-800-iShares (1-800-474-2737) |
| Additional Information Website | <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-B108"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span> |
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares 10-20 Year Treasury Bond ETF $8 0.15% Footnote Reference Footnote Description Footnote (a) Annualized. |
| Expenses Paid, Amount | $ 8 |
| Expense Ratio, Percent | 0.15% |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results.</span>" id="sjs-B112"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">Past performance is not an indication of future results.</span> |
| Average Annual Return [Table Text Block] | Fund performance Average annual total returns Average Annual Total Returns 6-Month Total Returns 1 Year 5 Years 10 Years Fund NAV ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.45 % 5.98 % (4.15 )% 0.33 % Fund Market ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.40 5.97 (4.16 ) 0.33 ICE BofA US Broad Market Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.85 7.35 (0.08 ) 1.67 ICE ® ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.51 6.07 (4.14 ) 0.38 |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. |
| Updated Performance Information Location [Text Block] | Visit iShares.com |
| AssetsNet | $ 8,223,011,793 |
| Holdings Count | Holding | 57 |
| InvestmentCompanyPortfolioTurnover | 18% |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $8,223,011,793 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 57 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 18% |
| Holdings [Text Block] | Maturity allocation Ten largest holdings Maturity Percent of TotaI Investments Footnote Reference 4-5 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.7 % 5-6 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.1 7-8 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.3 11-12 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.6 12-13 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.0 13-14 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.5 14-15 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.4 15-16 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.9 16-17 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 23.6 17-18 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 19.5 18-19 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 21.6 19-20 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 19.8 Security Percent of Total Investments Footnote Reference U.S. Treasury Bonds, 2.25%, 05/15/41 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.6 % U.S. Treasury Bonds, 2.00%, 11/15/41 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.9 U.S. Treasury Bonds, 4.75%, 11/15/43 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.7 U.S. Treasury Bonds, 4.50%, 02/15/44 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.6 U.S. Treasury Bonds, 1.88%, 02/15/41 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.6 U.S. Treasury Bonds, 1.75%, 08/15/41 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.4 U.S. Treasury Bonds, 2.75%, 08/15/42 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.0 U.S. Treasury Bonds, 1.38%, 11/15/40 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.9 U.S. Treasury Bonds, 3.88%, 02/15/43 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.5 U.S. Treasury Bonds, 4.38%, 08/15/43 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.8 Footnote Description Footnote (a) Excludes money market funds. |
| C000012090 | |
| Shareholder Report [Line Items] | |
| Fund Name | iShares 20+ Year Treasury Bond ETF |
| Trading Symbol | TLT |
| Security Exchange Name | NASDAQ |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about iShares 20+ Year Treasury Bond ETF (the “Fund”) for the period of March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports |
| Additional Information Phone Number | 1-800-iShares (1-800-474-2737) |
| Additional Information Website | <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-B130"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span> |
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares 20+ Year Treasury Bond ETF $8 0.15% Footnote Reference Footnote Description Footnote (a) Annualized. |
| Expenses Paid, Amount | $ 8 |
| Expense Ratio, Percent | 0.15% |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results.</span>" id="sjs-B134"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">Past performance is not an indication of future results.</span> |
| Average Annual Return [Table Text Block] | Fund performance Average annual total returns Average Annual Total Returns 6-Month Total Returns 1 Year 5 Years 10 Years Fund NAV ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.71 % 3.94 % (5.86 )% 0.39 % Fund Market ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.51 3.80 (5.90 ) 0.36 ICE BofA US Broad Market Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.85 7.35 (0.08 ) 1.67 ICE ® ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.78 4.08 (5.78 ) 0.47 |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. |
| Updated Performance Information Location [Text Block] | Visit iShares.com |
| AssetsNet | $ 61,842,331,512 |
| Holdings Count | Holding | 47 |
| InvestmentCompanyPortfolioTurnover | 11% |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $61,842,331,512 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 47 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 11% |
| Holdings [Text Block] | Maturity allocation Ten largest holdings Maturity Percent of TotaI Investments Footnote Reference 15-20 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.6 % 20-25 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 33.6 25-30 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 62.8 Security Percent of Total Investments Footnote Reference U.S. Treasury Bonds, 1.88%, 02/15/51 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.1 % U.S. Treasury Bonds, 2.00%, 08/15/51 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.7 U.S. Treasury Bonds, 1.63%, 11/15/50 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.7 U.S. Treasury Bonds, 1.88%, 11/15/51 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.3 U.S. Treasury Bonds, 4.13%, 08/15/53 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.7 U.S. Treasury Bonds, 3.00%, 02/15/48 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.4 U.S. Treasury Bonds, 4.75%, 11/15/53 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.4 U.S. Treasury Bonds, 4.25%, 02/15/54 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.1 U.S. Treasury Bonds, 3.63%, 05/15/53 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.9 U.S. Treasury Bonds, 2.50%, 02/15/46 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.7 Footnote Description Footnote (a) Excludes money market funds. |
| C000221912 | |
| Shareholder Report [Line Items] | |
| Fund Name | iShares 25+ Year Treasury STRIPS Bond ETF |
| Trading Symbol | GOVZ |
| Security Exchange Name | CboeBZX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about iShares 25+ Year Treasury STRIPS Bond ETF (the “Fund”) for the period of March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports |
| Additional Information Phone Number | 1-800-iShares (1-800-474-2737) |
| Additional Information Website | <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-B152"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span> |
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares 25+ Year Treasury STRIPS Bond ETF $5 0.10% Footnote Reference Footnote Description Footnote (a) Annualized. |
| Expenses Paid, Amount | $ 5 |
| Expense Ratio, Percent | 0.10% |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results.</span>" id="sjs-B156"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">Past performance is not an indication of future results.</span> |
| Average Annual Return [Table Text Block] | Fund performance Average annual total returns Average Annual Total Returns 6-Month Total Returns 1 Year Since Fund Inception Fund NAV ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.50 % 0.74 % (15.40 )% Fund Market ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.46 0.66 (15.36 ) ICE BofA US Broad Market Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.85 7.35 (1.71 ) ICE ® BofA ® ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.51 0.87 (15.59 ) |
| Performance Inception Date | Sep. 22, 2020 |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. |
| Updated Performance Information Location [Text Block] | Visit iShares.com |
| AssetsNet | $ 365,754,150 |
| Holdings Count | Holding | 22 |
| InvestmentCompanyPortfolioTurnover | 12% |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $365,754,150 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 22 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 12% |
| Holdings [Text Block] | Maturity allocation Ten largest holdings Maturity Percent of TotaI Investments Footnote Reference 20-25 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.6 % 25-30 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 94.4 Security Percent of Total Investments Footnote Reference U.S. Treasury Bonds Principal STRIPS 0.00%, 02/15/51 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.9 % 0.00%, 11/15/50 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.9 0.00%, 02/15/52 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.8 0.00%, 08/15/51 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.6 0.00%, 08/15/50 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.5 0.00%, 08/15/49 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.6 0.00%, 11/15/51 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.3 0.00%, 02/15/54 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.9 0.00%, 11/15/53 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.8 0.00%, 05/15/54 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.7 Footnote Description Footnote (a) Excludes money market funds. |
| C000037536 | |
| Shareholder Report [Line Items] | |
| Fund Name | iShares Short Treasury Bond ETF |
| Trading Symbol | SHV |
| Security Exchange Name | NASDAQ |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about iShares Short Treasury Bond ETF (the “Fund”) for the period of March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports |
| Additional Information Phone Number | 1-800-iShares (1-800-474-2737) |
| Additional Information Website | <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-B175"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span> |
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares Short Treasury Bond ETF $8 0.15% Footnote Reference Footnote Description Footnote (a) Annualized. |
| Expenses Paid, Amount | $ 8 |
| Expense Ratio, Percent | 0.15% |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results.</span>" id="sjs-B179"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">Past performance is not an indication of future results.</span> |
| Average Annual Return [Table Text Block] | Fund performance Average annual total returns Average Annual Total Returns 6-Month Total Returns 1 Year 5 Years 10 Years Fund NAV ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.71 % 5.44 % 2.15 % 1.52 % Fund Market ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.65 5.38 2.14 1.52 ICE BofA US Broad Market Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.85 7.35 (0.08 ) 1.67 ICE ® ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.40 4.81 2.02 1.53 |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. |
| Updated Performance Information Location [Text Block] | Visit iShares.com |
| AssetsNet | $ 19,119,417,987 |
| Holdings Count | Holding | 41 |
| InvestmentCompanyPortfolioTurnover | 34% |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $19,119,417,987 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 41 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 34% |
| Holdings [Text Block] | Portfolio composition Ten largest holdings Investment Type Percent of Total Investments Footnote Reference U.S. Treasury Obligations ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 100.0 % Security Percent of Total Investments Footnote Reference U.S. Treasury Bills, 5.33%, 10/03/24 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.0 % U.S. Treasury Bills, 5.24%, 01/02/25 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.8 U.S. Treasury Bills, 4.87%, 01/23/25 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.4 U.S. Treasury Bills, 5.00%, 10/29/24 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.3 U.S. Treasury Bills, 5.37%, 10/31/24 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.2 U.S. Treasury Bills, 5.30%, 09/17/24 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.8 U.S. Treasury Bills, 2.83%, 10/01/24 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.6 U.S. Treasury Bills, 5.22%, 11/14/24 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.4 U.S. Treasury Bills, 5.27%, 10/24/24 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.4 U.S. Treasury Bills, 4.91%, 02/13/25 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.3 Footnote Description Footnote (a) Excludes money market funds. |
| C000053739 | |
| Shareholder Report [Line Items] | |
| Fund Name | iShares California Muni Bond ETF |
| Trading Symbol | CMF |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about iShares California Muni Bond ETF (the “Fund”) for the period of March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports |
| Additional Information Phone Number | 1-800-iShares (1-800-474-2737) |
| Additional Information Website | <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-B197"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span> |
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares California Muni Bond ETF $4 0.08% Footnote Reference Footnote Description Footnote (a) Annualized. |
| Expenses Paid, Amount | $ 4 |
| Expense Ratio, Percent | 0.08% |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results.</span>" id="sjs-B201"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">Past performance is not an indication of future results.</span> |
| Average Annual Return [Table Text Block] | Fund performance Average annual total returns Average Annual Total Returns 6-Month Total Returns 1 Year 5 Years 10 Years Fund NAV ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.21 % 5.28 % 0.62 % 2.02 % Fund Market ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.00 5.30 0.58 1.99 ICE AMT-Free US National Municipal Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.49 5.55 1.03 2.25 ICE AMT-Free California Municipal Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.31 5.38 0.84 2.25 |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. |
| Updated Performance Information Location [Text Block] | Visit iShares.com |
| AssetsNet | $ 3,189,088,109 |
| Holdings Count | Holding | 1,227 |
| InvestmentCompanyPortfolioTurnover | 10% |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $3,189,088,109 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1,227 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10% |
| Holdings [Text Block] | Credit quality allocation Ten largest holdings S&P Credit Rating Footnote Reference Percent of Total Investments Footnote Reference AAA ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 14.3 % AA+ ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 11.7 AA ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 15.4 AA- ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 36.3 A+ ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.1 A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.6 A- ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.1 BBB+ ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.1 Not Rated ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 14.4 Security Percent of TotaI Investments Footnote Reference California Educational Facilities Authority, Series U-6, RB, 5.00%, 05/01/45 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.8 % Los Angeles Unified School District, Series 2024A, GO, 5.00%, 07/01/33 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.7 Los Angeles Unified School District, Series 2024A, GO, 5.00%, 07/01/34 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.6 State of California, GO, 5.00%, 09/01/41 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.6 Bay Area Toll Authority, Series 2023A, RB, VRDN, 3.85%, 09/03/24 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.6 State of California, GO, 5.00%, 09/01/39 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.6 State of California, GO, 5.00%, 11/01/32 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.6 Foothill-Eastern Transportation Corridor Agency, Series 2021A, RB, 4.00%, 01/15/46 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.6 State of California, GO, 5.00%, 10/01/25 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.6 Metropolitan Water District of Southern California, Series 2020A, RB, 5.00%, 10/01/49 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.5 Footnote Description Footnote * Credit quality ratings shown reflect the ratings assigned by S&P Global Ratings, a widely used independent, nationally recognized statistical rating organization. S&P credit ratings are opinions of the credit quality of individual obligations or of an issuer’s general creditworthiness. Investment grade ratings are credit ratings of BBB or higher. Below investment grade ratings are credit ratings of BB or lower. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. Footnote (a) Excludes money market funds. |
| C000052220 | |
| Shareholder Report [Line Items] | |
| Fund Name | iShares National Muni Bond ETF |
| Trading Symbol | MUB |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about iShares National Muni Bond ETF (the “Fund”) for the period of March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports |
| Additional Information Phone Number | 1-800-iShares (1-800-474-2737) |
| Additional Information Website | <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-B219"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span> |
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares National Muni Bond ETF $3 0.05% Footnote Reference Footnote Description Footnote (a) Annualized. |
| Expenses Paid, Amount | $ 3 |
| Expense Ratio, Percent | 0.05% |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results.</span>" id="sjs-B223"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">Past performance is not an indication of future results.</span> |
| Average Annual Return [Table Text Block] | Fund performance Average annual total returns Average Annual Total Returns 6-Month Total Returns 1 Year 5 Years 10 Years Fund NAV ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.37 % 5.44 % 0.97 % 2.18 % Fund Market ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.22 5.10 0.93 2.14 ICE AMT-Free US National Municipal Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.49 5.55 1.04 2.36 |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. |
| Updated Performance Information Location [Text Block] | Visit iShares.com |
| AssetsNet | $ 38,703,191,521 |
| Holdings Count | Holding | 5,777 |
| InvestmentCompanyPortfolioTurnover | 13% |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $38,703,191,521 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5,777 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 13% |
| Holdings [Text Block] | Credit quality allocation Ten largest states S&P Credit Rating Footnote Reference Percent of Total Investments Footnote Reference AAA ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 24.8 % AA+ ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 21.4 AA ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 14.9 AA- ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 16.5 A+ ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.8 A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.4 A- ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.4 BBB+ ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.4 BBB ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.1 BB+ ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.0 Footnote Reference Not Rated ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.3 State Percent of TotaI Investments Footnote Reference New York ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 23.0 % California ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 19.3 Texas ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.7 New Jersey ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.4 Massachusetts ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.3 Illinois ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.2 Washington ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.9 Pennsylvania ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.1 Maryland ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.7 Georgia ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.5 Footnote Description Footnote * Credit quality ratings shown reflect the ratings assigned by S&P Global Ratings, a widely used independent, nationally recognized statistical rating organization. S&P credit ratings are opinions of the credit quality of individual obligations or of an issuer’s general creditworthiness. Investment grade ratings are credit ratings of BBB or higher. Below investment grade ratings are credit ratings of BB or lower. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. Footnote (a) Excludes money market funds. Footnote (b) Rounds to less than 0.1%. |
| C000053740 | |
| Shareholder Report [Line Items] | |
| Fund Name | iShares New York Muni Bond ETF |
| Trading Symbol | NYF |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about iShares New York Muni Bond ETF (the “Fund”) for the period of March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports |
| Additional Information Phone Number | 1-800-iShares (1-800-474-2737) |
| Additional Information Website | <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-B241"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span> |
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares New York Muni Bond ETF $13 0.25% Footnote Reference Footnote Description Footnote (a) Annualized. |
| Expenses Paid, Amount | $ 13 |
| Expense Ratio, Percent | 0.25% |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results.</span>" id="sjs-B245"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">Past performance is not an indication of future results.</span> |
| Average Annual Return [Table Text Block] | Fund performance Average annual total returns Average Annual Total Returns 6-Month Total Returns 1 Year 5 Years 10 Years Fund NAV ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.41 % 5.55 % 0.80 % 2.05 % Fund Market ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.23 5.57 0.76 2.05 ICE AMT-Free US National Municipal Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.49 5.55 1.03 2.25 ICE AMT-Free New York Plus Municipal Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.56 5.68 0.96 2.25 |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. |
| Updated Performance Information Location [Text Block] | Visit iShares.com |
| AssetsNet | $ 749,250,057 |
| Holdings Count | Holding | 640 |
| InvestmentCompanyPortfolioTurnover | 8% |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $749,250,057 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 640 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8% |
| Holdings [Text Block] | Credit quality allocation Ten largest holdings S&P Credit Rating Footnote Reference Percent of Total Investments Footnote Reference AAA ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 23.9 % AA+ ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 19.7 AA ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 23.3 AA- ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 13.1 A+ ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.1 A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.4 A- ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.7 BBB+ ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.2 Not Rated ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.6 Security Percent of TotaI Investments Footnote Reference Utility Debt Securitization Authority, Series 2023TE-1, RB, 5.00%, 12/15/41 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.9 % New York State Urban Development Corp., Series 2017A, RB, 5.00%, 03/15/29 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.8 New York City Transitional Finance Authority Future Tax Secured, Series 2023A-1, RB, 5.25%, 08/01/42 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.7 New York State Dormitory Authority, Series 2020A, RB, 5.00%, 07/01/26 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.7 New York City Transitional Finance Authority, Series 2024G-1, RB, 5.00%, 05/01/43 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.7 New York State Dormitory Authority, Series 2024A, RB, 5.50%, 07/01/54 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.7 Long Island Power Authority, Series 2017, RB, 5.00%, 09/01/42 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.6 Monroe County Industrial Development Corp., Series 2018, RB, 5.00%, 05/01/34 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.6 City of New York, Series 2023A, Sub-Series A-4, GO, VRDN, 3.80%, 09/03/24 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.6 New York State Environmental Facilities Corp., Series 2024A, RB, 5.00%, 06/15/47 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.6 Footnote Description Footnote * Credit quality ratings shown reflect the ratings assigned by S&P Global Ratings, a widely used independent, nationally recognized statistical rating organization. S&P credit ratings are opinions of the credit quality of individual obligations or of an issuer’s general creditworthiness. Investment grade ratings are credit ratings of BBB or higher. Below investment grade ratings are credit ratings of BB or lower. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. Footnote (a) Excludes money market funds. |
| C000069126 | |
| Shareholder Report [Line Items] | |
| Fund Name | iShares Short-Term National Muni Bond ETF |
| Trading Symbol | SUB |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about iShares Short-Term National Muni Bond ETF (the “Fund”) for the period of March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports |
| Additional Information Phone Number | 1-800-iShares (1-800-474-2737) |
| Additional Information Website | <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-B263"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span> |
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares Short-Term National Muni Bond ETF $4 0.07% Footnote Reference Footnote Description Footnote (a) Annualized. |
| Expenses Paid, Amount | $ 4 |
| Expense Ratio, Percent | 0.07% |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results.</span>" id="sjs-B267"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">Past performance is not an indication of future results.</span> |
| Average Annual Return [Table Text Block] | Fund performance Average annual total returns Average Annual Total Returns 6-Month Total Returns 1 Year 5 Years 10 Years Fund NAV ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.81 % 4.05 % 1.10 % 1.11 % Fund Market ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.76 4.01 1.07 1.09 ICE AMT-Free US National Municipal Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.49 5.55 1.03 2.25 ICE ® ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.90 4.21 1.20 1.31 |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. |
| Updated Performance Information Location [Text Block] | Visit iShares.com |
| AssetsNet | $ 8,668,251,905 |
| Holdings Count | Holding | 2,360 |
| InvestmentCompanyPortfolioTurnover | 16% |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $8,668,251,905 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2,360 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 16% |
| Holdings [Text Block] | Credit quality allocation Ten largest states S&P Credit Rating Footnote Reference Percent of Total Investments Footnote Reference AAA ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 35.7 % AA+ ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 21.8 AA ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 12.0 AA- ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 12.8 A+ ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.4 A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.4 A- ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.0 BBB+ ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.1 BBB ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.0 Footnote Reference Not Rated ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.8 State Percent of TotaI Investments Footnote Reference New York ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 13.3 % California ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 12.2 Texas ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.2 Massachusetts ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.2 Washington ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.6 Maryland ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.5 New Jersey ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.8 Illinois ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.5 Minnesota ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.5 Virginia ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.4 Footnote Description Footnote * Credit quality ratings shown reflect the ratings assigned by S&P Global Ratings, a widely used independent, nationally recognized statistical rating organization. S&P credit ratings are opinions of the credit quality of individual obligations or of an issuer’s general creditworthiness. Investment grade ratings are credit ratings of BBB or higher. Below investment grade ratings are credit ratings of BB or lower. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. Footnote (a) Excludes money market funds. Footnote (b) Rounds to less than 0.1%. |
| C000069125 | |
| Shareholder Report [Line Items] | |
| Fund Name | iShares Agency Bond ETF |
| Trading Symbol | AGZ |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about iShares Agency Bond ETF (the “Fund”) for the period of March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports |
| Additional Information Phone Number | 1-800-iShares (1-800-474-2737) |
| Additional Information Website | <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-B285"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span> |
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares Agency Bond ETF $10 0.20% Footnote Reference Footnote Description Footnote (a) Annualized. |
| Expenses Paid, Amount | $ 10 |
| Expense Ratio, Percent | 0.20% |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results.</span>" id="sjs-B289"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">Past performance is not an indication of future results.</span> |
| Average Annual Return [Table Text Block] | Fund performance Average annual total returns Average Annual Total Returns 6-Month Total Returns 1 Year 5 Years 10 Years Fund NAV ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.62 % 6.30 % 0.83 % 1.66 % Fund Market ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.64 6.23 0.86 1.68 Bloomberg U.S. Universal Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.99 7.92 0.34 1.93 Bloomberg U.S. Agency Bond Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.68 6.42 0.70 1.65 |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. |
| Updated Performance Information Location [Text Block] | Visit iShares.com |
| AssetsNet | $ 701,806,337 |
| Holdings Count | Holding | 141 |
| InvestmentCompanyPortfolioTurnover | 13% |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $701,806,337 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 141 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 13% |
| Holdings [Text Block] | Portfolio composition Maturity allocation Investment Type Percent of Total Investments Footnote Reference U.S. Government Sponsored Agency Securities ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 95.4 % U.S. Treasury Obligations ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.4 Corporate Bonds ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.8 Foreign Government Obligations ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.4 Maturity Percent of TotaI Investments Footnote Reference 0-1 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.6 % 1-5 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 65.3 5-10 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 18.3 10-15 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.4 15-20 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.3 More than 20 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.1 Footnote Description Footnote (a) Excludes money market funds. |
| C000227271 | |
| Shareholder Report [Line Items] | |
| Fund Name | iShares BBB Rated Corporate Bond ETF |
| Trading Symbol | LQDB |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about iShares BBB Rated Corporate Bond ETF (the “Fund”) for the period of March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports |
| Additional Information Phone Number | 1-800-iShares (1-800-474-2737) |
| Additional Information Website | <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-B307"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span> |
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares BBB Rated Corporate Bond ETF $8 0.15% Footnote Reference Footnote Description Footnote (a) Annualized. |
| Expenses Paid, Amount | $ 8 |
| Expense Ratio, Percent | 0.15% |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results.</span>" id="sjs-B311"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">Past performance is not an indication of future results.</span> |
| Average Annual Return [Table Text Block] | Fund performance Average annual total returns Average Annual Total Returns 6-Month Total Returns 1 Year Since Fund Inception Fund NAV ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.14 % 9.52 % (0.54 )% Fund Market ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.25 9.67 (0.47 ) Bloomberg U.S. Universal Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.99 7.92 (0.98 ) iBoxx USD Liquid Investment Grade BBB 0+ Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.22 9.67 (0.40 ) |
| Performance Inception Date | May 18, 2021 |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. |
| Updated Performance Information Location [Text Block] | Visit iShares.com |
| AssetsNet | $ 34,880,017 |
| Holdings Count | Holding | 921 |
| InvestmentCompanyPortfolioTurnover | 5% |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $34,880,017 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 921 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5% |
| Holdings [Text Block] | Credit quality allocation Maturity allocation S&P Credit Rating Footnote Reference Percent of Total Investments Footnote Reference A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.8 % A- ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.2 BBB+ ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 29.2 BBB ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 47.8 BBB- ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 18.5 BB+ ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.1 Not Rated ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.4 Maturity Percent of TotaI Investments Footnote Reference 0-1 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.9 % 1-5 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 33.0 5-10 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 30.7 10-15 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.4 15-20 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.0 More than 20 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 21.0 Footnote Description Footnote * Credit quality ratings shown reflect the ratings assigned by S&P Global Ratings, a widely used independent, nationally recognized statistical rating organization. S&P credit ratings are opinions of the credit quality of individual obligations or of an issuer’s general creditworthiness. Investment grade ratings are credit ratings of BBB or higher. Below investment grade ratings are credit ratings of BB or lower. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. Footnote (a) Excludes money market funds. |
| C000231752 | |
| Shareholder Report [Line Items] | |
| Fund Name | iShares ESG Advanced Investment Grade Corporate Bond ETF |
| Trading Symbol | ELQD |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about iShares ESG Advanced Investment Grade Corporate Bond ETF (the “Fund”) for the period of March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports |
| Additional Information Phone Number | 1-800-iShares (1-800-474-2737) |
| Additional Information Website | <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-B330"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span> |
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares ESG Advanced Investment Grade Corporate Bond ETF $9 0.18% Footnote Reference Footnote Description Footnote (a) Annualized. |
| Expenses Paid, Amount | $ 9 |
| Expense Ratio, Percent | 0.18% |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results.</span>" id="sjs-B334"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">Past performance is not an indication of future results.</span> |
| Average Annual Return [Table Text Block] | Fund performance Average annual total returns Average Annual Total Returns 6-Month Total Returns 1 Year Since Fund Inception Fund NAV ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.42 % 9.31 % (3.07 )% Fund Market ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.52 9.42 (2.97 ) Bloomberg U.S. Universal Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.99 7.92 (1.72 ) iBoxx MSCI ESG Advanced USD Liquid Investment Grade Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.55 9.54 (2.86 ) |
| Performance Inception Date | Nov. 08, 2021 |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. |
| Updated Performance Information Location [Text Block] | Visit iShares.com |
| AssetsNet | $ 12,503,476 |
| Holdings Count | Holding | 577 |
| InvestmentCompanyPortfolioTurnover | 9% |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $12,503,476 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 577 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9% |
| Holdings [Text Block] | Credit quality allocation Maturity allocation Moody's Credit Rating Footnote Reference Percent of Total Investments Footnote Reference Aaa ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.5 % Aa ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.0 A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 46.8 Baa ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 43.0 Ba ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.7 Not Rated ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.0 Footnote Reference Maturity Percent of TotaI Investments Footnote Reference 1-5 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 20.2 % 5-10 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 36.0 10-15 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.2 15-20 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.0 More than 20 Years ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 27.6 Footnote Description Footnote * Credit quality ratings shown reflect the ratings assigned by Moody’s Investors Service (“Moody’s”), a widely used independent, nationally recognized statistical rating organization. Moody’s credit ratings are opinions of the credit quality of individual obligations or of an issuer’s general creditworthiness. Investment grade ratings are credit ratings of Baa or higher. Below investment grade ratings are credit ratings of Ba or lower. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. Footnote (a) Excludes money market funds. Footnote (b) Rounds to less than 0.1%. |
| Shareholder Report, Average Annual Return (Details) | 6 Months Ended | 12 Months Ended | 34 Months Ended | 39 Months Ended | 47 Months Ended | 51 Months Ended | 60 Months Ended | 120 Months Ended |
| Aug. 31, 2024 | Aug. 31, 2024 | Aug. 31, 2024 | Aug. 31, 2024 | Aug. 31, 2024 | Aug. 31, 2024 | Aug. 31, 2024 | Aug. 31, 2024 | |
| C000219740 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 2.68% | 5.43% | 2.41% | |||||
| C000012087 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 3.27% | 5.70% | 1.17% | 1.19% | ||||
| C000037537 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 4.31% | 6.45% | 0.15% | 1.34% | ||||
| C000012088 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 4.85% | 5.88% | (1.32%) | 1.17% | ||||
| C000037538 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 5.40% | 5.97% | (4.16%) | 0.33% | ||||
| C000012090 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 4.51% | 3.80% | (5.90%) | 0.36% | ||||
| C000221912 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 4.46% | 0.66% | (15.36%) | |||||
| C000037536 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 2.65% | 5.38% | 2.14% | 1.52% | ||||
| C000053739 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1% | 5.30% | 0.58% | 1.99% | ||||
| C000052220 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.22% | 5.10% | 0.93% | 2.14% | ||||
| C000053740 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.23% | 5.57% | 0.76% | 2.05% | ||||
| C000069126 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.76% | 4.01% | 1.07% | 1.09% | ||||
| C000069125 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 3.64% | 6.23% | 0.86% | 1.68% | ||||
| C000227271 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 5.25% | 9.67% | (0.47%) | |||||
| C000231752 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 5.52% | 9.42% | (2.97%) | |||||
| Without Sales Load [Member] | C000219740 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 2.74% | 5.50% | 2.42% | |||||
| Without Sales Load [Member] | C000012087 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 3.28% | 5.73% | 1.17% | 1.19% | ||||
| Without Sales Load [Member] | C000037537 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 4.36% | 6.48% | 0.16% | 1.34% | ||||
| Without Sales Load [Member] | C000012088 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 4.95% | 5.96% | (1.30%) | 1.17% | ||||
| Without Sales Load [Member] | C000037538 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 5.45% | 5.98% | (4.15%) | 0.33% | ||||
| Without Sales Load [Member] | C000012090 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 4.71% | 3.94% | (5.86%) | 0.39% | ||||
| Without Sales Load [Member] | C000221912 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 4.50% | 0.74% | (15.40%) | |||||
| Without Sales Load [Member] | C000037536 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 2.71% | 5.44% | 2.15% | 1.52% | ||||
| Without Sales Load [Member] | C000053739 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.21% | 5.28% | 0.62% | 2.02% | ||||
| Without Sales Load [Member] | C000052220 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.37% | 5.44% | 0.97% | 2.18% | ||||
| Without Sales Load [Member] | C000053740 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.41% | 5.55% | 0.80% | 2.05% | ||||
| Without Sales Load [Member] | C000069126 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.81% | 4.05% | 1.10% | 1.11% | ||||
| Without Sales Load [Member] | C000069125 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 3.62% | 6.30% | 0.83% | 1.66% | ||||
| Without Sales Load [Member] | C000227271 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 5.14% | 9.52% | (0.54%) | |||||
| Without Sales Load [Member] | C000231752 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 5.42% | 9.31% | (3.07%) | |||||
| FR Notes - Benchmark total return 6 months w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 4.85% | |||||||
| FR Notes - Benchmark total return 1 year | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 7.35% | |||||||
| FR Notes - Benchmark total return inception w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | (1.15%) | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 4.85% | |||||||
| FR Notes - Benchmark total return 1 year | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 7.35% | |||||||
| FR Notes - Benchmark total return 5 year | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | (0.08%) | |||||||
| FR Notes - Benchmark total return inception w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.67% | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 4.85% | |||||||
| FR Notes - Benchmark total return 1 year | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 7.35% | |||||||
| FR Notes - Benchmark total return 5 year | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | (0.08%) | |||||||
| FR Notes - Benchmark total return inception w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.67% | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 4.85% | |||||||
| FR Notes - Benchmark total return 1 year | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 7.35% | |||||||
| FR Notes - Benchmark total return 5 year | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | (0.08%) | |||||||
| FR Notes - Benchmark total return inception w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.67% | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 4.85% | |||||||
| FR Notes - Benchmark total return 1 year | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 7.35% | |||||||
| FR Notes - Benchmark total return 5 year | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | (0.08%) | |||||||
| FR Notes - Benchmark total return inception w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.67% | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 4.85% | |||||||
| FR Notes - Benchmark total return 1 year | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 7.35% | |||||||
| FR Notes - Benchmark total return 5 year | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | (0.08%) | |||||||
| FR Notes - Benchmark total return inception w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.67% | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 4.85% | |||||||
| FR Notes - Benchmark total return 1 year | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 7.35% | |||||||
| FR Notes - Benchmark total return inception w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | (1.71%) | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 4.85% | |||||||
| FR Notes - Benchmark total return 1 year | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 7.35% | |||||||
| FR Notes - Benchmark total return 5 year | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | (0.08%) | |||||||
| FR Notes - Benchmark total return inception w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.67% | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.49% | |||||||
| FR Notes - Benchmark total return 1 year | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 5.55% | |||||||
| FR Notes - Benchmark total return 5 year | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.03% | |||||||
| FR Notes - Benchmark total return inception w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 2.25% | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.49% | |||||||
| FR Notes - Benchmark total return 1 year | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 5.55% | |||||||
| FR Notes - Benchmark total return 5 year | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.04% | |||||||
| FR Notes - Benchmark total return inception w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 2.36% | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.49% | |||||||
| FR Notes - Benchmark total return 1 year | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 5.55% | |||||||
| FR Notes - Benchmark total return 5 year | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.03% | |||||||
| FR Notes - Benchmark total return inception w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 2.25% | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.49% | |||||||
| FR Notes - Benchmark total return 1 year | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 5.55% | |||||||
| FR Notes - Benchmark total return 5 year | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.03% | |||||||
| FR Notes - Benchmark total return inception w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 2.25% | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 4.99% | |||||||
| FR Notes - Benchmark total return 1 year | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 7.92% | |||||||
| FR Notes - Benchmark total return 5 year | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 0.34% | |||||||
| FR Notes - Benchmark total return inception w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.93% | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 4.99% | |||||||
| FR Notes - Benchmark total return 1 year | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 7.92% | |||||||
| FR Notes - Benchmark total return inception w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | (0.98%) | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 4.99% | |||||||
| FR Notes - Benchmark total return 1 year | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 7.92% | |||||||
| FR Notes - Benchmark total return inception w/o sales charge | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | (1.72%) | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 2.13% | |||||||
| FR Notes - Benchmark total return 1 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 4.31% | |||||||
| FR Notes - Benchmark total return 10 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.89% | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 3.35% | |||||||
| FR Notes - Benchmark total return 1 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 5.88% | |||||||
| FR Notes - Benchmark total return 5 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.29% | |||||||
| FR Notes - Benchmark total return 10 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.32% | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 4.43% | |||||||
| FR Notes - Benchmark total return 1 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 6.61% | |||||||
| FR Notes - Benchmark total return 5 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 0.29% | |||||||
| FR Notes - Benchmark total return 10 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.46% | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 5.02% | |||||||
| FR Notes - Benchmark total return 1 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 6.08% | |||||||
| FR Notes - Benchmark total return 5 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | (1.18%) | |||||||
| FR Notes - Benchmark total return 10 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.28% | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 5.51% | |||||||
| FR Notes - Benchmark total return 1 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 6.07% | |||||||
| FR Notes - Benchmark total return 5 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | (4.14%) | |||||||
| FR Notes - Benchmark total return 10 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 0.38% | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 4.78% | |||||||
| FR Notes - Benchmark total return 1 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 4.08% | |||||||
| FR Notes - Benchmark total return 5 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | (5.78%) | |||||||
| FR Notes - Benchmark total return 10 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 0.47% | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 4.51% | |||||||
| FR Notes - Benchmark total return 1 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 0.87% | |||||||
| FR Notes - Benchmark total return 10 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | (15.59%) | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 2.40% | |||||||
| FR Notes - Benchmark total return 1 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 4.81% | |||||||
| FR Notes - Benchmark total return 5 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 2.02% | |||||||
| FR Notes - Benchmark total return 10 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.53% | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.31% | |||||||
| FR Notes - Benchmark total return 1 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 5.38% | |||||||
| FR Notes - Benchmark total return 5 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 0.84% | |||||||
| FR Notes - Benchmark total return 10 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 2.25% | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.56% | |||||||
| FR Notes - Benchmark total return 1 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 5.68% | |||||||
| FR Notes - Benchmark total return 5 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 0.96% | |||||||
| FR Notes - Benchmark total return 10 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 2.25% | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.90% | |||||||
| FR Notes - Benchmark total return 1 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 4.21% | |||||||
| FR Notes - Benchmark total return 5 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.20% | |||||||
| FR Notes - Benchmark total return 10 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.31% | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 3.68% | |||||||
| FR Notes - Benchmark total return 1 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 6.42% | |||||||
| FR Notes - Benchmark total return 5 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 0.70% | |||||||
| FR Notes - Benchmark total return 10 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 1.65% | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 5.22% | |||||||
| FR Notes - Benchmark total return 1 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 9.67% | |||||||
| FR Notes - Benchmark total return 10 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | (0.40%) | |||||||
| FR Notes - Benchmark total return 6 months w/o sales charge - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 5.55% | |||||||
| FR Notes - Benchmark total return 1 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | 9.54% | |||||||
| FR Notes - Benchmark total return 10 year - 2 | ||||||||
| Average Annual Return [Line Items] | ||||||||
| Average Annual Return, Percent | (2.86%) |
| Shareholder Report, Holdings (Details) | Aug. 31, 2024 |
| C000219740 | U.S. Treasury Bills, , 09/17/2024, 5.3010 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.20% |
| C000219740 | U.S. Treasury Bills, , 10/29/2024, 5.2122 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11% |
| C000219740 | U.S. Treasury Bills, , 09/03/2024, 5.3135 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11% |
| C000219740 | U.S. Treasury Bills, , 10/01/2024, 5.2700 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.80% |
| C000219740 | U.S. Treasury Bills, , 09/24/2024, 5.2985 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.20% |
| C000219740 | U.S. Treasury Bills, , 10/22/2024, 5.1662 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7% |
| C000219740 | U.S. Treasury Bills, , 10/15/2024, 5.2110 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.40% |
| C000219740 | U.S. Treasury Bills, , 11/21/2024, 5.1199 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.30% |
| C000219740 | U.S. Treasury Bills, , 10/03/2024, 5.2713 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000219740 | U.S. Treasury Bills, , 09/12/2024, 5.3147 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.70% |
| C000012087 | U.S. Treasury Notes, , 02/15/2026, 4 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000012087 | U.S. Treasury Notes, , 11/15/2025, 4.5 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000012087 | U.S. Treasury Notes, , 12/15/2025, 4 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000012087 | U.S. Treasury Notes, , 01/15/2026, 3.875 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000012087 | U.S. Treasury Notes, , 05/31/2026, 0.75 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000012087 | U.S. Treasury Notes, , 02/28/2026, 4.625 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000012087 | U.S. Treasury Notes, , 01/15/2027, 4 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000012087 | U.S. Treasury Notes, , 03/15/2027, 4.25 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000012087 | U.S. Treasury Notes, , 11/15/2025, 2.25 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000012087 | U.S. Treasury Notes, , 05/15/2027, 4.5 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000037537 | U.S. Treasury Notes, , 02/15/2029, 2.625 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000037537 | U.S. Treasury Notes, , 11/30/2030, 4.375 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000037537 | U.S. Treasury Notes, , 10/31/2028, 1.375 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000037537 | U.S. Treasury Notes, , 09/30/2028, 1.25 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000037537 | U.S. Treasury Notes, , 07/31/2028, 1 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000037537 | U.S. Treasury Notes, , 08/15/2028, 2.875 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000037537 | U.S. Treasury Notes, , 05/15/2029, 2.375 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000037537 | U.S. Treasury Notes, , 11/15/2028, 3.125 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000037537 | U.S. Treasury Notes, , 02/15/2028, 2.75 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000037537 | U.S. Treasury Notes, , 08/31/2030, 4.125 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000012088 | U.S. Treasury Notes, , 02/15/2034, 4 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.50% |
| C000012088 | U.S. Treasury Notes, , 11/15/2033, 4.5 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.40% |
| C000012088 | U.S. Treasury Notes, , 05/15/2034, 4.375 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.50% |
| C000012088 | U.S. Treasury Notes, , 08/15/2033, 3.875 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.10% |
| C000012088 | U.S. Treasury Notes, , 02/15/2032, 1.875 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.60% |
| C000012088 | U.S. Treasury Notes, , 05/15/2033, 3.375 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.50% |
| C000012088 | U.S. Treasury Notes, , 02/15/2033, 3.5 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8% |
| C000012088 | U.S. Treasury Notes, , 05/15/2032, 2.875 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8% |
| C000012088 | U.S. Treasury Notes, , 11/15/2031, 1.375 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.70% |
| C000012088 | U.S. Treasury Notes, , 11/15/2032, 4.125 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.20% |
| C000037538 | U.S. Treasury Bonds, , 05/15/2041, 2.25 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000037538 | U.S. Treasury Bonds, , 11/15/2041, 2 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000037538 | U.S. Treasury Bonds, , 11/15/2043, 4.75 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000037538 | U.S. Treasury Bonds, , 02/15/2044, 4.5 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000037538 | U.S. Treasury Bonds, , 02/15/2041, 1.875 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000037538 | U.S. Treasury Bonds, , 08/15/2041, 1.75 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.40% |
| C000037538 | U.S. Treasury Bonds, , 08/15/2042, 2.75 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000037538 | U.S. Treasury Bonds, , 11/15/2040, 1.375 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000037538 | U.S. Treasury Bonds, , 02/15/2043, 3.875 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000037538 | U.S. Treasury Bonds, , 08/15/2043, 4.375 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000012090 | U.S. Treasury Bonds, , 02/15/2051, 1.875 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.10% |
| C000012090 | U.S. Treasury Bonds, , 08/15/2051, 2 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.70% |
| C000012090 | U.S. Treasury Bonds, , 11/15/2050, 1.625 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000012090 | U.S. Treasury Bonds, , 11/15/2051, 1.875 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.30% |
| C000012090 | U.S. Treasury Bonds, , 08/15/2053, 4.125 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.70% |
| C000012090 | U.S. Treasury Bonds, , 02/15/2048, 3 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000012090 | U.S. Treasury Bonds, , 11/15/2053, 4.75 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000012090 | U.S. Treasury Bonds, , 02/15/2054, 4.25 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000012090 | U.S. Treasury Bonds, , 05/15/2053, 3.625 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000012090 | U.S. Treasury Bonds, , 02/15/2046, 2.5 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000221912 | U.S. Treasury Bonds Principal STRIPS, , 02/15/2051, 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.90% |
| C000221912 | U.S. Treasury Bonds Principal STRIPS, , 11/15/2050, 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.90% |
| C000221912 | U.S. Treasury Bonds Principal STRIPS, , 02/15/2052, 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.80% |
| C000221912 | U.S. Treasury Bonds Principal STRIPS, , 08/15/2051, 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000221912 | U.S. Treasury Bonds Principal STRIPS, , 08/15/2050, 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000221912 | U.S. Treasury Bonds Principal STRIPS, , 08/15/2049, 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000221912 | U.S. Treasury Bonds Principal STRIPS, , 11/15/2051, 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.30% |
| C000221912 | U.S. Treasury Bonds Principal STRIPS, , 02/15/2054, 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000221912 | U.S. Treasury Bonds Principal STRIPS, , 11/15/2053, 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000221912 | U.S. Treasury Bonds Principal STRIPS, , 05/15/2054, 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.70% |
| C000037536 | U.S. Treasury Bills, , 10/03/2024, 5.3320 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6% |
| C000037536 | U.S. Treasury Bills, , 01/02/2025, 5.2368 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000037536 | U.S. Treasury Bills, , 01/23/2025, 4.8729 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000037536 | U.S. Treasury Bills, , 10/29/2024, 5.0049 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000037536 | U.S. Treasury Bills, , 10/31/2024, 5.3747 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000037536 | U.S. Treasury Bills, , 09/17/2024, 5.3035 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000037536 | U.S. Treasury Bills, , 10/01/2024, 2.8276 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000037536 | U.S. Treasury Bills, , 11/14/2024, 5.2245 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000037536 | U.S. Treasury Bills, , 10/24/2024, 5.2668 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000037536 | U.S. Treasury Bills, , 02/13/2025, 4.9129 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000037536 | U.S. Treasury Obligations | |
| Holdings [Line Items] | |
| Percent of Total Investments | 100% |
| C000053739 | California Educational Facilities Authority, U-6, 05/01/2045,, 5 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000053739 | Los Angeles Unified School District, 2024A, 07/01/2033,, 5 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000053739 | Los Angeles Unified School District, 2024A, 07/01/2034,, 5 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000053739 | State of California, , 09/01/2041,, 5 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000053739 | Bay Area Toll Authority, 2023A, 04/01/2055,, 3.85000158 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000053739 | State of California, , 09/01/2039,, 5 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000053739 | State of California, , 11/01/2032,, 5 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000053739 | Foothill-Eastern Transportation Corridor Agency, 2021A, 01/15/2046,, 4 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000053739 | State of California, , 10/01/2025,, 5 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000053739 | Metropolitan Water District of Southern California, 2020A, 10/01/2049,, 5 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000053739 | AAA | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.30% |
| C000053739 | AA+ | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.70% |
| C000053739 | AA | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.40% |
| C000053739 | AA- | |
| Holdings [Line Items] | |
| Percent of Total Investments | 36.30% |
| C000053739 | A+ | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.10% |
| C000053739 | A | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000053739 | A- | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000053739 | BBB+ | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000053739 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.40% |
| C000052220 | New York | |
| Holdings [Line Items] | |
| Percent of Total Investments | 23% |
| C000052220 | California | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19.30% |
| C000052220 | Texas | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.70% |
| C000052220 | New Jersey | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000052220 | Massachusetts | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000052220 | Illinois | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000052220 | Washington | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000052220 | Pennsylvania | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000052220 | Maryland | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000052220 | Georgia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000052220 | AAA | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.80% |
| C000052220 | AA+ | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.40% |
| C000052220 | AA | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.90% |
| C000052220 | AA- | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.50% |
| C000052220 | A+ | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000052220 | A | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000052220 | A- | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.40% |
| C000052220 | BBB+ | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000052220 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.30% |
| C000052220 | BBB | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000052220 | BB+ | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0% |
| C000053740 | Utility Debt Securitization Authority, 2023TE-1, 12/15/2041,, 5 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000053740 | New York State Urban Development Corp., 2017A, 03/15/2029,, 5 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000053740 | New York City Transitional Finance Authority Future Tax Secured, 2023A-1, 08/01/2042,, 5.25 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000053740 | New York State Dormitory Authority, 2020A, 07/01/2026,, 5 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000053740 | New York City Transitional Finance Authority, 2024G-1, 05/01/2043,, 5 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000053740 | New York State Dormitory Authority, 2024A, 07/01/2054,, 5.5 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000053740 | Long Island Power Authority, 2017, 09/01/2042,, 5 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000053740 | Monroe County Industrial Development Corp., 2018, 05/01/2034,, 5 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000053740 | City of New York, 2023A, Sub-Series A-4, 09/01/2049,, 3.79999866 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000053740 | New York State Environmental Facilities Corp., 2024A, 06/15/2047,, 5 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000053740 | AAA | |
| Holdings [Line Items] | |
| Percent of Total Investments | 23.90% |
| C000053740 | AA+ | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19.70% |
| C000053740 | AA | |
| Holdings [Line Items] | |
| Percent of Total Investments | 23.30% |
| C000053740 | AA- | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.10% |
| C000053740 | A+ | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000053740 | A | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.40% |
| C000053740 | A- | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000053740 | BBB+ | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| C000053740 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.60% |
| C000069126 | New York | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.30% |
| C000069126 | California | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.20% |
| C000069126 | Texas | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.20% |
| C000069126 | New Jersey | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000069126 | Massachusetts | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000069126 | Illinois | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000069126 | Washington | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000069126 | Maryland | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000069126 | Minnesota | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000069126 | Virginia | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000069126 | AAA | |
| Holdings [Line Items] | |
| Percent of Total Investments | 35.70% |
| C000069126 | AA+ | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.80% |
| C000069126 | AA | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12% |
| C000069126 | AA- | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.80% |
| C000069126 | A+ | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000069126 | A | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000069126 | A- | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000069126 | BBB+ | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000069126 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.80% |
| C000069126 | BBB | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0% |
| C000069125 | U.S. Treasury Obligations | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000069125 | U.S. Government Sponsored Agency Securities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 95.40% |
| C000069125 | Corporate Bonds | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000069125 | Foreign Government Obligations | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000227271 | A | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000227271 | A- | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000227271 | BBB+ | |
| Holdings [Line Items] | |
| Percent of Total Investments | 29.20% |
| C000227271 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000227271 | BBB | |
| Holdings [Line Items] | |
| Percent of Total Investments | 47.80% |
| C000227271 | BB+ | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000227271 | BBB- | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.50% |
| C000231752 | A | |
| Holdings [Line Items] | |
| Percent of Total Investments | 46.80% |
| C000231752 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0% |
| C000231752 | Aaa | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000231752 | Aa | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000231752 | Baa | |
| Holdings [Line Items] | |
| Percent of Total Investments | 43% |
| C000231752 | Ba | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
