iShares MSCI ACWI ex U.S. ETF (ACWX) N-CSRS 3 Dec 24 Certified semi-annual shareholder report (management investment company) Financial data

Form N-CSR Cover

Form N-CSR Cover	6 Months Ended
	Sep. 30, 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	Sep. 30, 2024

Shareholder Report

Shareholder Report	6 Months Ended
	Sep. 30, 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	Sep. 30, 2024
C000012080
Shareholder Report [Line Items]
Fund Name	iShares Biotechnology ETF
Trading Symbol	IBB
Security Exchange Name	NASDAQ
Annual or Semi-Annual Statement [Text Block]	This semi-annual shareholder report contains important information about iShares Biotechnology ETF (the “Fund”) for the period of April 1, 2024 to September 30, 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">&lt;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;">&lt;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&lt;/span>&lt;/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 Biotechnology ETF $23 0.44% Footnote Reference Footnote Description Footnote (a) Annualized.
Expenses Paid, Amount	$ 23
Expense Ratio, Percent	0.44%
Performance Past Does Not Indicate Future [Text]	Past performance is not an indication of future results.</span>" id="sjs-B23">&lt;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.&lt;/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 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.21 % 19.42 % 8.18 % 5.03 % MSCI USA Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.21 36.22 15.94 13.30 NYSE Biotechnology Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.36 19.80 8.57 5.37
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	$ 7,578,017,225
Holdings Count | Holding	218
InvestmentCompanyPortfolioTurnover	7%
Additional Fund Statistics [Text Block]	Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $7,578,017,225 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 218 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7%
Holdings [Text Block]	Industry allocation Ten largest holdings Industry Percent of TotaI Investments Footnote Reference Biotechnology ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 80.5 % Life Sciences Tools & Services ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 16.7 Pharmaceuticals ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.5 Health Care Providers & Services ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.2 Health Care Equipment & Supplies ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.1 Chemicals ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.0 Footnote Reference Security Percent of Total Investments Footnote Reference Gilead Sciences, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.6 % Amgen, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.9 Vertex Pharmaceuticals, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.6 Regeneron Pharmaceuticals, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.2 IQVIA Holdings, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.1 Alnylam Pharmaceuticals, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.4 Mettler-Toledo International, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.0 Biogen, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.7 Argenx SE, ADR ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.7 BioNTech SE, ADR ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.3 Footnote Description Footnote (a) Excludes money market funds. Footnote (b) Rounds to less than 0.1%.
C000012040
Shareholder Report [Line Items]
Fund Name	iShares Core S&amp;P 500 ETF
Trading Symbol	IVV
Security Exchange Name	NYSEArca
Annual or Semi-Annual Statement [Text Block]	This semi-annual shareholder report contains important information about iShares Core S&amp;P 500 ETF (the “Fund”) for the period of April 1, 2024 to September 30, 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-B41">&lt;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;">&lt;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&lt;/span>&lt;/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 Core S&P 500 ETF $2 0.03% Footnote Reference Footnote Description Footnote (a) Annualized.
Expenses Paid, Amount	$ 2
Expense Ratio, Percent	0.03%
Performance Past Does Not Indicate Future [Text]	Past performance is not an indication of future results.</span>" id="sjs-B45">&lt;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.&lt;/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 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.40 % 36.30 % 15.94 % 13.34 % S&P Total Market Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.60 35.24 15.15 12.75 S&P 500 ® ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.42 36.35 15.98 13.38
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	$ 532,844,798,309
Holdings Count | Holding	506
InvestmentCompanyPortfolioTurnover	2%
Additional Fund Statistics [Text Block]	Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $532,844,798,309 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 506 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2%
Holdings [Text Block]	Sector allocation
C000012047
Shareholder Report [Line Items]
Fund Name	iShares Core S&amp;P Total U.S. Stock Market ETF
Trading Symbol	ITOT
Security Exchange Name	NYSEArca
Annual or Semi-Annual Statement [Text Block]	This semi-annual shareholder report contains important information about iShares Core S&amp;P Total U.S. Stock Market ETF (the “Fund”) for the period of April 1, 2024 to September 30, 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-B63">&lt;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;">&lt;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&lt;/span>&lt;/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 Core S&P Total U.S. Stock Market ETF $2 0.03% Footnote Reference Footnote Description Footnote (a) Annualized.
Expenses Paid, Amount	$ 2
Expense Ratio, Percent	0.03%
Performance Past Does Not Indicate Future [Text]	Past performance is not an indication of future results.</span>" id="sjs-B67">&lt;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.&lt;/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 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.61 % 35.24 % 15.15 % 12.81 % S&P Total Market Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.60 35.24 15.15 12.75
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	$ 61,854,738,784
Holdings Count | Holding	2,550
InvestmentCompanyPortfolioTurnover	2%
Additional Fund Statistics [Text Block]	Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $61,854,738,784 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2,550 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2%
Holdings [Text Block]	Sector allocation
C000012082
Shareholder Report [Line Items]
Fund Name	iShares Expanded Tech Sector ETF
Trading Symbol	IGM
Security Exchange Name	NYSEArca
Annual or Semi-Annual Statement [Text Block]	This semi-annual shareholder report contains important information about iShares Expanded Tech Sector ETF (the “Fund”) for the period of April 1, 2024 to September 30, 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-B85">&lt;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;">&lt;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&lt;/span>&lt;/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 Expanded Tech Sector ETF $21 0.39% Footnote Reference Footnote Description Footnote (a) Annualized.
Expenses Paid, Amount	$ 21
Expense Ratio, Percent	0.39%
Performance Past Does Not Indicate Future [Text]	Past performance is not an indication of future results.</span>" id="sjs-B89">&lt;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.&lt;/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 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 11.50 % 51.09 % 22.00 % 20.07 % S&P Total Market Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.60 35.24 15.15 12.75 S&P North American Expanded Technology Sector Index™ ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 11.73 51.53 22.48 20.57
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	$ 5,354,375,310
Holdings Count | Holding	285
InvestmentCompanyPortfolioTurnover	5%
Additional Fund Statistics [Text Block]	Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $5,354,375,310 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 285 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5%
Holdings [Text Block]	Industry allocation Ten largest holdings Industry Percent of TotaI Investments Footnote Reference Software ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 27.7 % Semiconductors & Semiconductor Equipment ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 27.4 Interactive Media & Services ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 18.0 Technology Hardware, Storage & Peripherals ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.2 IT Services ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.0 Communications Equipment ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.6 Entertainment ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.1 Electronic Equipment, Instruments & Components ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.0 Security Percent of Total Investments Footnote Reference Meta Platforms, Inc., Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.9 % Apple, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.5 NVIDIA Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.3 Microsoft Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.2 Alphabet, Inc., Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.8 Broadcom, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.5 Alphabet, Inc., Class C, NVS ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.9 Netflix, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.5 Oracle Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.2 Advanced Micro Devices, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.1 Footnote Description Footnote (a) Excludes money market funds.
C000012085
Shareholder Report [Line Items]
Fund Name	iShares Expanded Tech-Software Sector ETF
Trading Symbol	IGV
Security Exchange Name	CboeBZX
Annual or Semi-Annual Statement [Text Block]	This semi-annual shareholder report contains important information about iShares Expanded Tech-Software Sector ETF (the “Fund”) for the period of April 1, 2024 to September 30, 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-B107">&lt;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;">&lt;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&lt;/span>&lt;/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 Expanded Tech-Software Sector ETF $20 0.39% Footnote Reference Footnote Description Footnote (a) Annualized.
Expenses Paid, Amount	$ 20
Expense Ratio, Percent	0.39%
Performance Past Does Not Indicate Future [Text]	Past performance is not an indication of future results.</span>" id="sjs-B111">&lt;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.&lt;/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 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.75 % 31.04 % 16.25 % 18.11 % S&P Total Market Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.60 35.24 15.15 12.75 S&P North American Expanded Technology Software Index™ ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.94 30.91 16.59 18.47
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	$ 6,767,440,293
Holdings Count | Holding	118
InvestmentCompanyPortfolioTurnover	9%
Additional Fund Statistics [Text Block]	Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $6,767,440,293 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 118 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9%
Holdings [Text Block]	Industry allocation Ten largest holdings Industry Percent of TotaI Investments Footnote Reference Software ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 97.1 % Entertainment ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.4 Interactive Media & Services ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.5 Security Percent of Total Investments Footnote Reference Salesforce, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.0 % Oracle Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.8 Microsoft Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.4 Adobe, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.3 ServiceNow, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.1 Palo Alto Networks, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.3 Intuit, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.2 Synopsys, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.1 Palantir Technologies, Inc., Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.0 Cadence Design Systems, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.0 Footnote Description Footnote (a) Excludes money market funds.
C000012202
Shareholder Report [Line Items]
Fund Name	iShares Micro-Cap ETF
Trading Symbol	IWC
Security Exchange Name	NYSEArca
Annual or Semi-Annual Statement [Text Block]	This semi-annual shareholder report contains important information about iShares Micro-Cap ETF (the “Fund”) for the period of April 1, 2024 to September 30, 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-B129">&lt;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;">&lt;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&lt;/span>&lt;/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 Micro-Cap ETF $30 0.60% Footnote Reference Footnote Description Footnote (a) Annualized.
Expenses Paid, Amount	$ 30
Expense Ratio, Percent	0.60%
Performance Past Does Not Indicate Future [Text]	Past performance is not an indication of future results.</span>" id="sjs-B133">&lt;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.&lt;/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 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.50 % 24.38 % 8.19 % 7.16 % Russell 3000 ® ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.65 35.19 15.26 12.83 Russell Microcap ® ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.58 24.63 8.45 7.29
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	$ 900,032,540
Holdings Count | Holding	1,448
InvestmentCompanyPortfolioTurnover	22%
Additional Fund Statistics [Text Block]	Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $900,032,540 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1,448 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 22%
Holdings [Text Block]	Sector allocation Ten largest holdings Sector Percent of Total Investments Footnote Reference Health Care ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 25.2 % Financials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 23.1 Industrials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 13.6 Information Technology ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 12.1 Consumer Discretionary ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.2 Energy ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.3 Real Estate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.0 Materials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.5 Communication Services ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.0 Consumer Staples ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.2 Utilities ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.8 Security Percent of Total Investments Footnote Reference Core Scientific, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.5 % MannKind Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.4 OneSpaWorld Holdings Ltd. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.4 Aspen Aerogels, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.4 CareDx, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.4 Blue Bird Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.4 Mirum Pharmaceuticals, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.4 REV Group, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.4 Nurix Therapeutics, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.4 Viridian Therapeutics, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.4 Footnote Description Footnote (a) Excludes money market funds.
C000012086
Shareholder Report [Line Items]
Fund Name	iShares North American Natural Resources ETF
Trading Symbol	IGE
Security Exchange Name	CboeBZX
Annual or Semi-Annual Statement [Text Block]	This semi-annual shareholder report contains important information about iShares North American Natural Resources ETF (the “Fund”) for the period of April 1, 2024 to September 30, 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-B151">&lt;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;">&lt;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&lt;/span>&lt;/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 North American Natural Resources ETF $20 0.39% Footnote Reference Footnote Description Footnote (a) Annualized.
Expenses Paid, Amount	$ 20
Expense Ratio, Percent	0.39%
Performance Past Does Not Indicate Future [Text]	Past performance is not an indication of future results.</span>" id="sjs-B155">&lt;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.&lt;/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 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ (0.69 )% 8.82 % 12.80 % 2.90 % S&P Global Broad Market Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.32 30.73 11.62 9.06 S&P North American Natural Resources Sector Index™ ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ (0.42 ) 9.40 13.39 3.42
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	$ 506,959,053
Holdings Count | Holding	129
InvestmentCompanyPortfolioTurnover	6%
Additional Fund Statistics [Text Block]	Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $506,959,053 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 129 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6%
Holdings [Text Block]	Industry allocation Ten largest holdings Industry Percent of TotaI Investments Footnote Reference Oil, Gas & Consumable Fuels ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 68.4 % Metals & Mining ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 13.8 Energy Equipment & Services ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.2 Containers & Packaging ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.7 Construction Materials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.3 Paper & Forest Products ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.6 Security Percent of Total Investments Footnote Reference Exxon Mobil Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.1 % Chevron Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.7 ConocoPhillips ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.4 Enbridge, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.4 Freeport-McMoRan, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.8 Canadian Natural Resources Ltd. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.8 EOG Resources, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.7 Newmont Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.4 Schlumberger NV ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.3 Williams Cos., Inc. (The) ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.2 Footnote Description Footnote (a) Excludes money market funds.
C000012074
Shareholder Report [Line Items]
Fund Name	iShares Russell 2000 ETF
Trading Symbol	IWM
Security Exchange Name	NYSEArca
Annual or Semi-Annual Statement [Text Block]	This semi-annual shareholder report contains important information about iShares Russell 2000 ETF (the “Fund”) for the period of April 1, 2024 to September 30, 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-B173">&lt;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;">&lt;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&lt;/span>&lt;/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 Russell 2000 ETF $10 0.19% Footnote Reference Footnote Description Footnote (a) Annualized.
Expenses Paid, Amount	$ 10
Expense Ratio, Percent	0.19%
Performance Past Does Not Indicate Future [Text]	Past performance is not an indication of future results.</span>" id="sjs-B177">&lt;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.&lt;/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 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.60 % 26.60 % 9.27 % 8.74 % Russell 3000 ® ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.65 35.19 15.26 12.83 Russell 2000 ® ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.69 26.76 9.39 8.78
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	$ 69,550,238,452
Holdings Count | Holding	1,986
InvestmentCompanyPortfolioTurnover	13%
Additional Fund Statistics [Text Block]	Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $69,550,238,452 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1,986 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 13%
Holdings [Text Block]	Sector allocation Ten largest holdings Sector Percent of Total Investments Footnote Reference Financials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 17.9 % Health Care ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 17.5 Industrials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 17.1 Information Technology ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 12.8 Consumer Discretionary ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.1 Real Estate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.5 Energy ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.3 Materials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.5 Utilities ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.8 Consumer Staples ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.8 Communication Services ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.7 Security Percent of Total Investments Footnote Reference Vaxcyte, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.5 % FTAI Aviation Ltd. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.5 Insmed, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.4 Sprouts Farmers Market, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.4 Fabrinet ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.3 Applied Industrial Technologies, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.3 Mueller Industries, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.3 Fluor Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.3 Ensign Group, Inc. (The) ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.3 UFP Industries, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.3 Footnote Description Footnote (a) Excludes money market funds.
C000012073
Shareholder Report [Line Items]
Fund Name	iShares Russell 2000 Growth ETF
Trading Symbol	IWO
Security Exchange Name	NYSEArca
Annual or Semi-Annual Statement [Text Block]	This semi-annual shareholder report contains important information about iShares Russell 2000 Growth ETF (the “Fund”) for the period of April 1, 2024 to September 30, 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-B195">&lt;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;">&lt;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&lt;/span>&lt;/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 Russell 2000 Growth ETF $12 0.24% Footnote Reference Footnote Description Footnote (a) Annualized.
Expenses Paid, Amount	$ 12
Expense Ratio, Percent	0.24%
Performance Past Does Not Indicate Future [Text]	Past performance is not an indication of future results.</span>" id="sjs-B199">&lt;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.&lt;/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 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.19 % 27.57 % 8.75 % 8.96 % Russell 3000 ® ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.65 35.19 15.26 12.83 Russell 2000 ® ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.25 27.66 8.82 8.95
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	$ 12,063,720,039
Holdings Count | Holding	1,124
InvestmentCompanyPortfolioTurnover	26%
Additional Fund Statistics [Text Block]	Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $12,063,720,039 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1,124 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 26%
Holdings [Text Block]	Sector allocation Ten largest holdings Sector Percent of Total Investments Footnote Reference Health Care ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 25.7 % Industrials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 21.8 Information Technology ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 19.6 Consumer Discretionary ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.1 Financials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.2 Materials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.9 Energy ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.4 Consumer Staples ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.2 Communication Services ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.0 Real Estate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.6 Utilities ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.5 Security Percent of Total Investments Footnote Reference Vaxcyte, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.0 % FTAI Aviation Ltd. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.0 Insmed, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.8 Sprouts Farmers Market, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.8 Fabrinet ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.6 Applied Industrial Technologies, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.6 Ensign Group, Inc. (The) ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.6 Mueller Industries, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.6 Carpenter Technology Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.6 Lantheus Holdings, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.6 Footnote Description Footnote (a) Excludes money market funds.
C000012072
Shareholder Report [Line Items]
Fund Name	iShares Russell 2000 Value ETF
Trading Symbol	IWN
Security Exchange Name	NYSEArca
Annual or Semi-Annual Statement [Text Block]	This semi-annual shareholder report contains important information about iShares Russell 2000 Value ETF (the “Fund”) for the period of April 1, 2024 to September 30, 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-B217">&lt;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;">&lt;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&lt;/span>&lt;/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 Russell 2000 Value ETF $12 0.24% Footnote Reference Footnote Description Footnote (a) Annualized.
Expenses Paid, Amount	$ 12
Expense Ratio, Percent	0.24%
Performance Past Does Not Indicate Future [Text]	Past performance is not an indication of future results.</span>" id="sjs-B221">&lt;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.&lt;/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 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.96 % 25.52 % 9.06 % 8.05 % Russell 3000 ® ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.65 35.19 15.26 12.83 Russell 2000 ® ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.14 25.88 9.29 8.22
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	$ 12,552,930,134
Holdings Count | Holding	1,443
InvestmentCompanyPortfolioTurnover	23%
Additional Fund Statistics [Text Block]	Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $12,552,930,134 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1,443 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 23%
Holdings [Text Block]	Sector allocation Ten largest holdings Sector Percent of Total Investments Footnote Reference Financials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 27.8 % Industrials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 12.2 Real Estate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 11.5 Consumer Discretionary ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.0 Health Care ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.3 Energy ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.2 Information Technology ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.9 Utilities ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.3 Materials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.1 Communication Services ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.4 Consumer Staples ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.3 Security Percent of Total Investments Footnote Reference SouthState Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.6 % Meritage Homes Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.6 Lumen Technologies, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.5 Taylor Morrison Home Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.5 Jackson Financial, Inc., Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.5 Essent Group Ltd. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.5 Terreno Realty Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.5 Commercial Metals Co. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.5 Essential Properties Realty Trust, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.5 Old National Bancorp ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.4 Footnote Description Footnote (a) Excludes money market funds.
C000183467
Shareholder Report [Line Items]
Fund Name	iShares Russell 2500 ETF
Trading Symbol	SMMD
Security Exchange Name	CboeBZX
Annual or Semi-Annual Statement [Text Block]	This semi-annual shareholder report contains important information about iShares Russell 2500 ETF (the “Fund”) for the period of April 1, 2024 to September 30, 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-B239">&lt;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;">&lt;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&lt;/span>&lt;/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 Russell 2500 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-B243">&lt;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.&lt;/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 Since Fund Inception Fund NAV ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.14 % 26.09 % 10.45 % 9.56 % Russell 3000 ® ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.65 35.19 15.26 14.06 Russell 2500 Index™ ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.10 26.17 10.43 9.57
Performance Inception Date	Jul. 06, 2017
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	$ 1,026,908,318
Holdings Count | Holding	506
InvestmentCompanyPortfolioTurnover	7%
Additional Fund Statistics [Text Block]	Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $1,026,908,318 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 506 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7%
Holdings [Text Block]	Sector allocation Ten largest holdings Sector Percent of Total Investments Footnote Reference Investment Funds ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 41.8 % Industrials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 11.8 Financials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.1 Consumer Discretionary ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.5 Information Technology ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.4 Health Care ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.5 Real Estate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.6 Materials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.1 Energy ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.7 Consumer Staples ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.2 Other Footnote Reference ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.3 Security Percent of Total Investments Footnote Reference iShares Russell 2000 ETF ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 41.8 % Smurfit WestRock plc ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.4 EQT Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.3 EMCOR Group, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.3 Lennox International, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.3 Packaging Corp. of America ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.3 NRG Energy, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.3 Carvana Co., Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.3 Avery Dennison Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.3 FactSet Research Systems, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.3 Footnote Description Footnote (a) Excludes money market funds. Footnote (b) Ten largest sectors are presented. Additional sectors are found in Other.
C000012068
Shareholder Report [Line Items]
Fund Name	iShares Russell Mid-Cap ETF
Trading Symbol	IWR
Security Exchange Name	NYSEArca
Annual or Semi-Annual Statement [Text Block]	This semi-annual shareholder report contains important information about iShares Russell Mid-Cap ETF (the “Fund”) for the period of April 1, 2024 to September 30, 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-B262">&lt;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;">&lt;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&lt;/span>&lt;/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 Russell Mid-Cap 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-B266">&lt;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.&lt;/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 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.47 % 29.12 % 11.13 % 10.03 % Russell 3000 ® ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.65 35.19 15.26 12.83 Russell MidCap ® ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.56 29.33 11.30 10.19
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	$ 36,577,669,608
Holdings Count | Holding	819
InvestmentCompanyPortfolioTurnover	9%
Additional Fund Statistics [Text Block]	Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $36,577,669,608 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 819 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9%
Holdings [Text Block]	Sector allocation Ten largest holdings Sector Percent of Total Investments Footnote Reference Industrials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 17.4 % Financials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 15.6 Information Technology ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 12.6 Consumer Discretionary ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.9 Health Care ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.2 Real Estate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.2 Materials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.9 Utilities ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.8 Consumer Staples ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.0 Energy ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.0 Communication Services ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.4 Security Percent of Total Investments Footnote Reference Palantir Technologies, Inc., Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.6 % Aflac, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.5 Arthur J Gallagher & Co. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.5 Hilton Worldwide Holdings, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.5 DR Horton, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.5 Williams Cos., Inc. (The) ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.5 Realty Income Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.5 Simon Property Group, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.5 United Rentals, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.5 ONEOK, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.5 Footnote Description Footnote (a) Excludes money market funds.
C000012066
Shareholder Report [Line Items]
Fund Name	iShares Russell Mid-Cap Growth ETF
Trading Symbol	IWP
Security Exchange Name	NYSEArca
Annual or Semi-Annual Statement [Text Block]	This semi-annual shareholder report contains important information about iShares Russell Mid-Cap Growth ETF (the “Fund”) for the period of April 1, 2024 to September 30, 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-B284">&lt;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;">&lt;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&lt;/span>&lt;/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 Russell Mid-Cap Growth ETF $12 0.23% Footnote Reference Footnote Description Footnote (a) Annualized.
Expenses Paid, Amount	$ 12
Expense Ratio, Percent	0.23%
Performance Past Does Not Indicate Future [Text]	Past performance is not an indication of future results.</span>" id="sjs-B288">&lt;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.&lt;/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 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.01 % 29.07 % 11.26 % 11.07 % Russell 3000 ® ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.65 35.19 15.26 12.83 Russell MidCap ® ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.12 29.33 11.48 11.30
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	$ 14,976,364,566
Holdings Count | Holding	292
InvestmentCompanyPortfolioTurnover	25%
Additional Fund Statistics [Text Block]	Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $14,976,364,566 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 292 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 25%
Holdings [Text Block]	Sector allocation Ten largest holdings Sector Percent of Total Investments Footnote Reference Information Technology ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 24.7 % Industrials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 18.2 Consumer Discretionary ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 15.5 Health Care ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 13.8 Financials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 12.5 Communication Services ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.4 Energy ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.9 Consumer Staples ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.5 Utilities ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.7 Real Estate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.4 Materials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.4 Security Percent of Total Investments Footnote Reference Palantir Technologies, Inc., Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.7 % Trade Desk, Inc. (The), Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.7 NU Holdings Ltd., Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.5 Monolithic Power Systems, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.5 Ameriprise Financial, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.5 IDEXX Laboratories, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.5 Vistra Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.5 WW Grainger, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.4 Old Dominion Freight Line, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.4 Fair Isaac Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.4 Footnote Description Footnote (a) Excludes money market funds.
C000012038
Shareholder Report [Line Items]
Fund Name	iShares S&amp;P Mid-Cap 400 Growth ETF
Trading Symbol	IJK
Security Exchange Name	NYSEArca
Annual or Semi-Annual Statement [Text Block]	This semi-annual shareholder report contains important information about iShares S&amp;P Mid-Cap 400 Growth ETF (the “Fund”) for the period of April 1, 2024 to September 30, 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-B306">&lt;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;">&lt;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&lt;/span>&lt;/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 S&P Mid-Cap 400 Growth ETF $8 0.17% Footnote Reference Footnote Description Footnote (a) Annualized.
Expenses Paid, Amount	$ 8
Expense Ratio, Percent	0.17%
Performance Past Does Not Indicate Future [Text]	Past performance is not an indication of future results.</span>" id="sjs-B310">&lt;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.&lt;/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 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.02 % 28.30 % 11.45 % 10.37 % S&P Total Market Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.60 35.24 15.15 12.75 S&P MidCap 400 Growth Index™ ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.10 28.49 11.63 10.58
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	$ 9,798,351,336
Holdings Count | Holding	259
InvestmentCompanyPortfolioTurnover	13%
Additional Fund Statistics [Text Block]	Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $9,798,351,336 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 259 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 13%
Holdings [Text Block]	Sector allocation Ten largest holdings Sector Percent of Total Investments Footnote Reference Industrials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 29.6 % Consumer Discretionary ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 18.0 Information Technology ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 11.1 Health Care ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.1 Financials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.6 Energy ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.8 Materials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.7 Real Estate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.9 Consumer Staples ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.4 Communication Services ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.3 Utilities ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.5 Security Percent of Total Investments Footnote Reference Carlisle Cos., Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.4 % EMCOR Group, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.3 Williams-Sonoma, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.3 Lennox International, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.3 Manhattan Associates, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.2 Watsco, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.1 Dynatrace, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.1 Reliance, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.1 Toll Brothers, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.1 Pure Storage, Inc., Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.0 Footnote Description Footnote (a) Excludes money market funds.
C000012039
Shareholder Report [Line Items]
Fund Name	iShares S&amp;P Mid-Cap 400 Value ETF
Trading Symbol	IJJ
Security Exchange Name	NYSEArca
Annual or Semi-Annual Statement [Text Block]	This semi-annual shareholder report contains important information about iShares S&amp;P Mid-Cap 400 Value ETF (the “Fund”) for the period of April 1, 2024 to September 30, 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-B328">&lt;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;">&lt;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&lt;/span>&lt;/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 S&P Mid-Cap 400 Value 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-B332">&lt;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.&lt;/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 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.55 % 24.77 % 11.26 % 9.48 % S&P Total Market Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.60 35.24 15.15 12.75 S&P MidCap 400 Value Index™ ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.66 24.99 11.45 9.69
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	$ 7,760,233,634
Holdings Count | Holding	297
InvestmentCompanyPortfolioTurnover	9%
Additional Fund Statistics [Text Block]	Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $7,760,233,634 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 297 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9%
Holdings [Text Block]	Sector allocation Ten largest holdings Sector Percent of Total Investments Footnote Reference Financials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 23.9 % Industrials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 15.1 Consumer Discretionary ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.6 Real Estate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.2 Health Care ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.7 Materials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.4 Information Technology ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.1 Consumer Staples ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.3 Utilities ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.9 Energy ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.2 Communication Services ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.6 Security Percent of Total Investments Footnote Reference Illumina, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.5 % Chesapeake Energy Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.2 Fidelity National Financial, Inc., Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.1 Tenet Healthcare Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.1 US Foods Holding Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.1 Reinsurance Group of America, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.0 WP Carey, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.0 Coherent Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.0 Jones Lang LaSalle, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.9 Performance Food Group Co. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.9 Footnote Description Footnote (a) Excludes money market funds.
C000012044
Shareholder Report [Line Items]
Fund Name	iShares S&amp;P Small-Cap 600 Growth ETF
Trading Symbol	IJT
Security Exchange Name	NASDAQ
Annual or Semi-Annual Statement [Text Block]	This semi-annual shareholder report contains important information about iShares S&amp;P Small-Cap 600 Growth ETF (the “Fund”) for the period of April 1, 2024 to September 30, 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-B350">&lt;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;">&lt;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&lt;/span>&lt;/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 S&P Small-Cap 600 Growth 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-B354">&lt;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.&lt;/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 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.33 % 28.41 % 10.40 % 10.59 % S&P Total Market Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.60 35.24 15.15 12.75 S&P SmallCap 600 Growth Index™ ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.45 28.65 10.64 10.81
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	$ 6,519,740,052
Holdings Count | Holding	391
InvestmentCompanyPortfolioTurnover	13%
Additional Fund Statistics [Text Block]	Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $6,519,740,052 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 391 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 13%
Holdings [Text Block]	Sector allocation Ten largest holdings Sector Percent of Total Investments Footnote Reference Industrials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 19.2 % Consumer Discretionary ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 16.1 Information Technology ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 14.3 Health Care ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 13.5 Financials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.7 Energy ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.8 Materials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.6 Real Estate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.3 Communication Services ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.2 Consumer Staples ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.7 Utilities ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.6 Security Percent of Total Investments Footnote Reference Mueller Industries, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.3 % ATI, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.2 Carpenter Technology Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.2 Meritage Homes Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.1 SPX Technologies, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.1 SPS Commerce, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.1 Glaukos Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.1 Badger Meter, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.0 CSW Industrials, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.9 Moog, Inc., Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.9 Footnote Description Footnote (a) Excludes money market funds.
C000012084
Shareholder Report [Line Items]
Fund Name	iShares Semiconductor ETF
Trading Symbol	SOXX
Security Exchange Name	NASDAQ
Annual or Semi-Annual Statement [Text Block]	This semi-annual shareholder report contains important information about iShares Semiconductor ETF (the “Fund”) for the period of April 1, 2024 to September 30, 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-B372">&lt;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;">&lt;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&lt;/span>&lt;/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 Semiconductor ETF $17 0.34% Footnote Reference Footnote Description Footnote (a) Annualized.
Expenses Paid, Amount	$ 17
Expense Ratio, Percent	0.34%
Performance Past Does Not Indicate Future [Text]	Past performance is not an indication of future results.</span>" id="sjs-B376">&lt;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.&lt;/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 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.41 % 46.87 % 27.95 % 24.49 % MSCI USA Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.21 36.22 15.94 13.30 NYSE Semiconductor Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.62 47.47 28.52 25.10
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	$ 14,878,541,734
Holdings Count | Holding	34
InvestmentCompanyPortfolioTurnover	17%
Additional Fund Statistics [Text Block]	Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $14,878,541,734 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 34 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 17%
Holdings [Text Block]	Industry allocation Ten largest holdings Industry Percent of TotaI Investments Footnote Reference Semiconductors & Semiconductor Equipment ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 100.0 % Security Percent of Total Investments Footnote Reference Advanced Micro Devices, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.8 % Broadcom, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.5 NVIDIA Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.1 QUALCOMM, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.1 Texas Instruments, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.0 Micron Technology, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.3 Intel Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.3 Applied Materials, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.1 Lam Research Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.0 Monolithic Power Systems, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.0 Footnote Description Footnote (a) Excludes money market funds.
C000012083
Shareholder Report [Line Items]
Fund Name	iShares U.S. Digital Infrastructure and Real Estate ETF
Trading Symbol	IDGT
Security Exchange Name	NYSEArca
Annual or Semi-Annual Statement [Text Block]	This semi-annual shareholder report contains important information about iShares U.S. Digital Infrastructure and Real Estate ETF (the “Fund”) for the period of April 1, 2024 to September 30, 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-B394">&lt;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;">&lt;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&lt;/span>&lt;/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 U.S. Digital Infrastructure and Real Estate ETF $21 0.39% Footnote Reference Footnote Description Footnote (a) Annualized.
Expenses Paid, Amount	$ 21
Expense Ratio, Percent	0.39%
Performance Past Does Not Indicate Future [Text]	Past performance is not an indication of future results.</span>" id="sjs-B398">&lt;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.&lt;/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 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.56 % 29.47 % 8.89 % 9.40 % S&P Total Market Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.60 35.24 15.15 12.75 S&P Data Center, Tower REIT and Communications Equipment Index™ ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.84 30.08 9.33 9.81
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	$ 55,200,268
Holdings Count | Holding	32
InvestmentCompanyPortfolioTurnover	20%
Additional Fund Statistics [Text Block]	Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $55,200,268 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 32 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 20%
Holdings [Text Block]	Industry allocation Ten largest holdings Industry Percent of TotaI Investments Footnote Reference Specialized REITs ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 46.9 % Communications Equipment ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 30.8 Semiconductors & Semiconductor Equipment ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.3 Technology Hardware, Storage & Peripherals ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.8 IT Services ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.2 Software ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.0 Security Percent of Total Investments Footnote Reference Equinix, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.9 % Digital Realty Trust, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.9 Crown Castle, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.2 American Tower Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.2 Fastly, Inc., Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.2 Arista Networks, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.9 Uniti Group, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.6 Nokia OYJ, ADR, NVS ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.5 Telefonaktiebolaget LM Ericsson, ADR ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.5 Motorola Solutions, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.5 Footnote Description Footnote (a) Excludes money market funds.

Shareholder Report, Average Ann

Shareholder Report, Average Annual Return (Details)	6 Months Ended	12 Months Ended	60 Months Ended	87 Months Ended	120 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2024
Without Sales Load [Member] | C000012080
Average Annual Return [Line Items]
Average Annual Return, Percent	6.21%	19.42%	8.18%		5.03%
Without Sales Load [Member] | C000012040
Average Annual Return [Line Items]
Average Annual Return, Percent	10.40%	36.30%	15.94%		13.34%
Without Sales Load [Member] | C000012047
Average Annual Return [Line Items]
Average Annual Return, Percent	9.61%	35.24%	15.15%		12.81%
Without Sales Load [Member] | C000012082
Average Annual Return [Line Items]
Average Annual Return, Percent	11.50%	51.09%	22%		20.07%
Without Sales Load [Member] | C000012085
Average Annual Return [Line Items]
Average Annual Return, Percent	4.75%	31.04%	16.25%		18.11%
Without Sales Load [Member] | C000012202
Average Annual Return [Line Items]
Average Annual Return, Percent	2.50%	24.38%	8.19%		7.16%
Without Sales Load [Member] | C000012086
Average Annual Return [Line Items]
Average Annual Return, Percent	(0.69%)	8.82%	12.80%		2.90%
Without Sales Load [Member] | C000012074
Average Annual Return [Line Items]
Average Annual Return, Percent	5.60%	26.60%	9.27%		8.74%
Without Sales Load [Member] | C000012073
Average Annual Return [Line Items]
Average Annual Return, Percent	5.19%	27.57%	8.75%		8.96%
Without Sales Load [Member] | C000012072
Average Annual Return [Line Items]
Average Annual Return, Percent	5.96%	25.52%	9.06%		8.05%
Without Sales Load [Member] | C000183467
Average Annual Return [Line Items]
Average Annual Return, Percent	4.14%	26.09%	10.45%	9.56%
Without Sales Load [Member] | C000012068
Average Annual Return [Line Items]
Average Annual Return, Percent	5.47%	29.12%	11.13%		10.03%
Without Sales Load [Member] | C000012066
Average Annual Return [Line Items]
Average Annual Return, Percent	3.01%	29.07%	11.26%		11.07%
Without Sales Load [Member] | C000012038
Average Annual Return [Line Items]
Average Annual Return, Percent	1.02%	28.30%	11.45%		10.37%
Without Sales Load [Member] | C000012039
Average Annual Return [Line Items]
Average Annual Return, Percent	5.55%	24.77%	11.26%		9.48%
Without Sales Load [Member] | C000012044
Average Annual Return [Line Items]
Average Annual Return, Percent	7.33%	28.41%	10.40%		10.59%
Without Sales Load [Member] | C000012084
Average Annual Return [Line Items]
Average Annual Return, Percent	2.41%	46.87%	27.95%		24.49%
Without Sales Load [Member] | C000012083
Average Annual Return [Line Items]
Average Annual Return, Percent	10.56%	29.47%	8.89%		9.40%
FR Notes - Benchmark total return 6 months w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent	10.21%
FR Notes - Benchmark total return 1 year
Average Annual Return [Line Items]
Average Annual Return, Percent		36.22%
FR Notes - Benchmark total return 5 year
Average Annual Return [Line Items]
Average Annual Return, Percent			15.94%
FR Notes - Benchmark total return inception w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent					13.30%
FR Notes - Benchmark total return 6 months w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent	9.60%
FR Notes - Benchmark total return 1 year
Average Annual Return [Line Items]
Average Annual Return, Percent		35.24%
FR Notes - Benchmark total return 5 year
Average Annual Return [Line Items]
Average Annual Return, Percent			15.15%
FR Notes - Benchmark total return inception w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent					12.75%
FR Notes - Benchmark total return 6 months w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent	9.60%
FR Notes - Benchmark total return 1 year
Average Annual Return [Line Items]
Average Annual Return, Percent		35.24%
FR Notes - Benchmark total return 5 year
Average Annual Return [Line Items]
Average Annual Return, Percent			15.15%
FR Notes - Benchmark total return inception w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent					12.75%
FR Notes - Benchmark total return 6 months w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent	9.60%
FR Notes - Benchmark total return 1 year
Average Annual Return [Line Items]
Average Annual Return, Percent		35.24%
FR Notes - Benchmark total return 5 year
Average Annual Return [Line Items]
Average Annual Return, Percent			15.15%
FR Notes - Benchmark total return inception w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent					12.75%
FR Notes - Benchmark total return 6 months w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent	9.60%
FR Notes - Benchmark total return 1 year
Average Annual Return [Line Items]
Average Annual Return, Percent		35.24%
FR Notes - Benchmark total return 5 year
Average Annual Return [Line Items]
Average Annual Return, Percent			15.15%
FR Notes - Benchmark total return inception w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent					12.75%
FR Notes - Benchmark total return 6 months w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent	9.65%
FR Notes - Benchmark total return 1 year
Average Annual Return [Line Items]
Average Annual Return, Percent		35.19%
FR Notes - Benchmark total return 5 year
Average Annual Return [Line Items]
Average Annual Return, Percent			15.26%
FR Notes - Benchmark total return inception w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent					12.83%
FR Notes - Benchmark total return 6 months w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent	9.32%
FR Notes - Benchmark total return 1 year
Average Annual Return [Line Items]
Average Annual Return, Percent		30.73%
FR Notes - Benchmark total return 5 year
Average Annual Return [Line Items]
Average Annual Return, Percent			11.62%
FR Notes - Benchmark total return inception w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent					9.06%
FR Notes - Benchmark total return 6 months w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent	9.65%
FR Notes - Benchmark total return 1 year
Average Annual Return [Line Items]
Average Annual Return, Percent		35.19%
FR Notes - Benchmark total return 5 year
Average Annual Return [Line Items]
Average Annual Return, Percent			15.26%
FR Notes - Benchmark total return inception w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent					12.83%
FR Notes - Benchmark total return 6 months w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent	9.65%
FR Notes - Benchmark total return 1 year
Average Annual Return [Line Items]
Average Annual Return, Percent		35.19%
FR Notes - Benchmark total return 5 year
Average Annual Return [Line Items]
Average Annual Return, Percent			15.26%
FR Notes - Benchmark total return inception w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent					12.83%
FR Notes - Benchmark total return 6 months w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent	9.65%
FR Notes - Benchmark total return 1 year
Average Annual Return [Line Items]
Average Annual Return, Percent		35.19%
FR Notes - Benchmark total return 5 year
Average Annual Return [Line Items]
Average Annual Return, Percent			15.26%
FR Notes - Benchmark total return inception w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent					12.83%
FR Notes - Benchmark total return 6 months w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent	9.65%
FR Notes - Benchmark total return 1 year
Average Annual Return [Line Items]
Average Annual Return, Percent		35.19%
FR Notes - Benchmark total return 5 year
Average Annual Return [Line Items]
Average Annual Return, Percent			15.26%
FR Notes - Benchmark total return inception w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent				14.06%
FR Notes - Benchmark total return 6 months w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent	9.65%
FR Notes - Benchmark total return 1 year
Average Annual Return [Line Items]
Average Annual Return, Percent		35.19%
FR Notes - Benchmark total return 5 year
Average Annual Return [Line Items]
Average Annual Return, Percent			15.26%
FR Notes - Benchmark total return inception w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent					12.83%
FR Notes - Benchmark total return 6 months w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent	9.65%
FR Notes - Benchmark total return 1 year
Average Annual Return [Line Items]
Average Annual Return, Percent		35.19%
FR Notes - Benchmark total return 5 year
Average Annual Return [Line Items]
Average Annual Return, Percent			15.26%
FR Notes - Benchmark total return inception w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent					12.83%
FR Notes - Benchmark total return 6 months w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent	9.60%
FR Notes - Benchmark total return 1 year
Average Annual Return [Line Items]
Average Annual Return, Percent		35.24%
FR Notes - Benchmark total return 5 year
Average Annual Return [Line Items]
Average Annual Return, Percent			15.15%
FR Notes - Benchmark total return inception w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent					12.75%
FR Notes - Benchmark total return 6 months w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent	9.60%
FR Notes - Benchmark total return 1 year
Average Annual Return [Line Items]
Average Annual Return, Percent		35.24%
FR Notes - Benchmark total return 5 year
Average Annual Return [Line Items]
Average Annual Return, Percent			15.15%
FR Notes - Benchmark total return inception w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent					12.75%
FR Notes - Benchmark total return 6 months w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent	9.60%
FR Notes - Benchmark total return 1 year
Average Annual Return [Line Items]
Average Annual Return, Percent		35.24%
FR Notes - Benchmark total return 5 year
Average Annual Return [Line Items]
Average Annual Return, Percent			15.15%
FR Notes - Benchmark total return inception w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent					12.75%
FR Notes - Benchmark total return 6 months w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent	10.21%
FR Notes - Benchmark total return 1 year
Average Annual Return [Line Items]
Average Annual Return, Percent		36.22%
FR Notes - Benchmark total return 5 year
Average Annual Return [Line Items]
Average Annual Return, Percent			15.94%
FR Notes - Benchmark total return inception w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent					13.30%
FR Notes - Benchmark total return 6 months w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent	9.60%
FR Notes - Benchmark total return 1 year
Average Annual Return [Line Items]
Average Annual Return, Percent		35.24%
FR Notes - Benchmark total return 5 year
Average Annual Return [Line Items]
Average Annual Return, Percent			15.15%
FR Notes - Benchmark total return inception w/o sales charge
Average Annual Return [Line Items]
Average Annual Return, Percent					12.75%
FR Notes - Benchmark total return 6 months w/o sales charge - 2
Average Annual Return [Line Items]
Average Annual Return, Percent	6.36%
FR Notes - Benchmark total return 1 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent		19.80%
FR Notes - Benchmark total return 5 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent			8.57%
FR Notes - Benchmark total return 10 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent					5.37%
FR Notes - Benchmark total return 6 months w/o sales charge - 2
Average Annual Return [Line Items]
Average Annual Return, Percent	10.42%
FR Notes - Benchmark total return 1 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent		36.35%
FR Notes - Benchmark total return 5 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent			15.98%
FR Notes - Benchmark total return 10 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent					13.38%
FR Notes - Benchmark total return 6 months w/o sales charge - 2
Average Annual Return [Line Items]
Average Annual Return, Percent	11.73%
FR Notes - Benchmark total return 1 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent		51.53%
FR Notes - Benchmark total return 5 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent			22.48%
FR Notes - Benchmark total return 10 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent					20.57%
FR Notes - Benchmark total return 6 months w/o sales charge - 2
Average Annual Return [Line Items]
Average Annual Return, Percent	4.94%
FR Notes - Benchmark total return 1 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent		30.91%
FR Notes - Benchmark total return 5 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent			16.59%
FR Notes - Benchmark total return 10 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent					18.47%
FR Notes - Benchmark total return 6 months w/o sales charge - 2
Average Annual Return [Line Items]
Average Annual Return, Percent	2.58%
FR Notes - Benchmark total return 1 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent		24.63%
FR Notes - Benchmark total return 5 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent			8.45%
FR Notes - Benchmark total return 10 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent					7.29%
FR Notes - Benchmark total return 6 months w/o sales charge - 2
Average Annual Return [Line Items]
Average Annual Return, Percent	(0.42%)
FR Notes - Benchmark total return 1 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent		9.40%
FR Notes - Benchmark total return 5 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent			13.39%
FR Notes - Benchmark total return 10 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent					3.42%
FR Notes - Benchmark total return 6 months w/o sales charge - 2
Average Annual Return [Line Items]
Average Annual Return, Percent	5.69%
FR Notes - Benchmark total return 1 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent		26.76%
FR Notes - Benchmark total return 5 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent			9.39%
FR Notes - Benchmark total return 10 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent					8.78%
FR Notes - Benchmark total return 6 months w/o sales charge - 2
Average Annual Return [Line Items]
Average Annual Return, Percent	5.25%
FR Notes - Benchmark total return 1 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent		27.66%
FR Notes - Benchmark total return 5 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent			8.82%
FR Notes - Benchmark total return 10 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent					8.95%
FR Notes - Benchmark total return 6 months w/o sales charge - 2
Average Annual Return [Line Items]
Average Annual Return, Percent	6.14%
FR Notes - Benchmark total return 1 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent		25.88%
FR Notes - Benchmark total return 5 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent			9.29%
FR Notes - Benchmark total return 10 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent					8.22%
FR Notes - Benchmark total return 6 months w/o sales charge - 2
Average Annual Return [Line Items]
Average Annual Return, Percent	4.10%
FR Notes - Benchmark total return 1 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent		26.17%
FR Notes - Benchmark total return 5 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent			10.43%
FR Notes - Benchmark total return 10 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent				9.57%
FR Notes - Benchmark total return 6 months w/o sales charge - 2
Average Annual Return [Line Items]
Average Annual Return, Percent	5.56%
FR Notes - Benchmark total return 1 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent		29.33%
FR Notes - Benchmark total return 5 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent			11.30%
FR Notes - Benchmark total return 10 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent					10.19%
FR Notes - Benchmark total return 6 months w/o sales charge - 2
Average Annual Return [Line Items]
Average Annual Return, Percent	3.12%
FR Notes - Benchmark total return 1 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent		29.33%
FR Notes - Benchmark total return 5 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent			11.48%
FR Notes - Benchmark total return 10 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent					11.30%
FR Notes - Benchmark total return 6 months w/o sales charge - 2
Average Annual Return [Line Items]
Average Annual Return, Percent	1.10%
FR Notes - Benchmark total return 1 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent		28.49%
FR Notes - Benchmark total return 5 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent			11.63%
FR Notes - Benchmark total return 10 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent					10.58%
FR Notes - Benchmark total return 6 months w/o sales charge - 2
Average Annual Return [Line Items]
Average Annual Return, Percent	5.66%
FR Notes - Benchmark total return 1 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent		24.99%
FR Notes - Benchmark total return 5 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent			11.45%
FR Notes - Benchmark total return 10 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent					9.69%
FR Notes - Benchmark total return 6 months w/o sales charge - 2
Average Annual Return [Line Items]
Average Annual Return, Percent	7.45%
FR Notes - Benchmark total return 1 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent		28.65%
FR Notes - Benchmark total return 5 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent			10.64%
FR Notes - Benchmark total return 10 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent					10.81%
FR Notes - Benchmark total return 6 months w/o sales charge - 2
Average Annual Return [Line Items]
Average Annual Return, Percent	2.62%
FR Notes - Benchmark total return 1 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent		47.47%
FR Notes - Benchmark total return 5 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent			28.52%
FR Notes - Benchmark total return 10 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent					25.10%
FR Notes - Benchmark total return 6 months w/o sales charge - 2
Average Annual Return [Line Items]
Average Annual Return, Percent	10.84%
FR Notes - Benchmark total return 1 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent		30.08%
FR Notes - Benchmark total return 5 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent			9.33%
FR Notes - Benchmark total return 10 year - 2
Average Annual Return [Line Items]
Average Annual Return, Percent					9.81%

Shareholder Report, Holdings (D

Shareholder Report, Holdings (Details)	Sep. 30, 2024
C000012080 | Gilead Sciences, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	8.60%
C000012080 | Amgen, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	7.90%
C000012080 | Vertex Pharmaceuticals, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	7.60%
C000012080 | Regeneron Pharmaceuticals, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	7.20%
C000012080 | IQVIA Holdings, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	4.10%
C000012080 | Alnylam Pharmaceuticals, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	3.40%
C000012080 | Mettler-Toledo International, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	3%
C000012080 | Biogen, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	2.70%
C000012080 | Argenx SE, , , 0
Holdings [Line Items]
Percent of Total Investments	2.70%
C000012080 | BioNTech SE, , , 0
Holdings [Line Items]
Percent of Total Investments	2.30%
C000012080 | Biotechnology
Holdings [Line Items]
Percent of Total Investments	80.50%
C000012080 | Life Sciences Tools & Services
Holdings [Line Items]
Percent of Total Investments	16.70%
C000012080 | Pharmaceuticals
Holdings [Line Items]
Percent of Total Investments	2.50%
C000012080 | Health Care Providers & Services
Holdings [Line Items]
Percent of Total Investments	0.20%
C000012080 | Health Care Equipment & Supplies
Holdings [Line Items]
Percent of Total Investments	0.10%
C000012080 | Chemicals
Holdings [Line Items]
Percent of Total Investments	0%
C000012040 | Apple, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	7.30%
C000012040 | Microsoft Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	6.60%
C000012040 | NVIDIA Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	6.10%
C000012040 | Amazon.com, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	3.60%
C000012040 | Meta Platforms, Inc., A, , 0
Holdings [Line Items]
Percent of Total Investments	2.60%
C000012040 | Alphabet, Inc., A, , 0
Holdings [Line Items]
Percent of Total Investments	2%
C000012040 | Berkshire Hathaway, Inc., B, , 0
Holdings [Line Items]
Percent of Total Investments	1.70%
C000012040 | Alphabet, Inc., C, , 0
Holdings [Line Items]
Percent of Total Investments	1.60%
C000012040 | Broadcom, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	1.60%
C000012040 | Tesla, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	1.50%
C000012040 | Information Technology
Holdings [Line Items]
Percent of Total Investments	31.80%
C000012040 | Financials
Holdings [Line Items]
Percent of Total Investments	12.90%
C000012040 | Health Care
Holdings [Line Items]
Percent of Total Investments	11.60%
C000012040 | Consumer Discretionary
Holdings [Line Items]
Percent of Total Investments	10.10%
C000012040 | Communication Services
Holdings [Line Items]
Percent of Total Investments	8.90%
C000012040 | Industrials
Holdings [Line Items]
Percent of Total Investments	8.50%
C000012040 | Consumer Staples
Holdings [Line Items]
Percent of Total Investments	5.90%
C000012040 | Energy
Holdings [Line Items]
Percent of Total Investments	3.30%
C000012040 | Utilities
Holdings [Line Items]
Percent of Total Investments	2.50%
C000012040 | Real Estate
Holdings [Line Items]
Percent of Total Investments	2.30%
C000012040 | Materials
Holdings [Line Items]
Percent of Total Investments	2.20%
C000012047 | Apple, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	6.30%
C000012047 | Microsoft Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	5.70%
C000012047 | NVIDIA Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	5.30%
C000012047 | Amazon.com, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	3.10%
C000012047 | Meta Platforms, Inc., A, , 0
Holdings [Line Items]
Percent of Total Investments	2.20%
C000012047 | Alphabet, Inc., A, , 0
Holdings [Line Items]
Percent of Total Investments	1.70%
C000012047 | Berkshire Hathaway, Inc., B, , 0
Holdings [Line Items]
Percent of Total Investments	1.50%
C000012047 | Alphabet, Inc., C, , 0
Holdings [Line Items]
Percent of Total Investments	1.40%
C000012047 | Broadcom, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	1.40%
C000012047 | Tesla, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	1.30%
C000012047 | Information Technology
Holdings [Line Items]
Percent of Total Investments	29.70%
C000012047 | Financials
Holdings [Line Items]
Percent of Total Investments	13.50%
C000012047 | Health Care
Holdings [Line Items]
Percent of Total Investments	11.70%
C000012047 | Consumer Discretionary
Holdings [Line Items]
Percent of Total Investments	10.40%
C000012047 | Communication Services
Holdings [Line Items]
Percent of Total Investments	8.30%
C000012047 | Industrials
Holdings [Line Items]
Percent of Total Investments	9.70%
C000012047 | Consumer Staples
Holdings [Line Items]
Percent of Total Investments	5.50%
C000012047 | Energy
Holdings [Line Items]
Percent of Total Investments	3.40%
C000012047 | Utilities
Holdings [Line Items]
Percent of Total Investments	2.40%
C000012047 | Real Estate
Holdings [Line Items]
Percent of Total Investments	2.80%
C000012047 | Materials
Holdings [Line Items]
Percent of Total Investments	2.60%
C000012082 | Apple, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	8.50%
C000012082 | Microsoft Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	8.20%
C000012082 | NVIDIA Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	8.30%
C000012082 | Meta Platforms, Inc., A, , 0
Holdings [Line Items]
Percent of Total Investments	8.90%
C000012082 | Alphabet, Inc., A, , 0
Holdings [Line Items]
Percent of Total Investments	4.80%
C000012082 | Alphabet, Inc., C, , 0
Holdings [Line Items]
Percent of Total Investments	3.90%
C000012082 | Broadcom, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	4.50%
C000012082 | Netflix, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	2.50%
C000012082 | Oracle Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	2.20%
C000012082 | Advanced Micro Devices, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	2.10%
C000012082 | Software
Holdings [Line Items]
Percent of Total Investments	27.70%
C000012082 | Semiconductors & Semiconductor Equipment
Holdings [Line Items]
Percent of Total Investments	27.40%
C000012082 | Interactive Media & Services
Holdings [Line Items]
Percent of Total Investments	18%
C000012082 | Technology Hardware, Storage & Peripherals
Holdings [Line Items]
Percent of Total Investments	10.20%
C000012082 | IT Services
Holdings [Line Items]
Percent of Total Investments	7%
C000012082 | Communications Equipment
Holdings [Line Items]
Percent of Total Investments	3.60%
C000012082 | Entertainment
Holdings [Line Items]
Percent of Total Investments	3.10%
C000012082 | Electronic Equipment, Instruments & Components
Holdings [Line Items]
Percent of Total Investments	3%
C000012085 | Microsoft Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	8.40%
C000012085 | Oracle Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	8.80%
C000012085 | Salesforce, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	9%
C000012085 | Adobe, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	7.30%
C000012085 | ServiceNow, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	7.10%
C000012085 | Palo Alto Networks, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	4.30%
C000012085 | Intuit, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	4.20%
C000012085 | Synopsys, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	3.10%
C000012085 | Palantir Technologies, Inc., A, , 0
Holdings [Line Items]
Percent of Total Investments	3%
C000012085 | Cadence Design Systems, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	3%
C000012085 | Software
Holdings [Line Items]
Percent of Total Investments	97.10%
C000012085 | Interactive Media & Services
Holdings [Line Items]
Percent of Total Investments	0.50%
C000012085 | Entertainment
Holdings [Line Items]
Percent of Total Investments	2.40%
C000012202 | Core Scientific, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.50%
C000012202 | MannKind Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	0.40%
C000012202 | OneSpaWorld Holdings Ltd., , , 0
Holdings [Line Items]
Percent of Total Investments	0.40%
C000012202 | Aspen Aerogels, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.40%
C000012202 | CareDx, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.40%
C000012202 | Blue Bird Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	0.40%
C000012202 | Mirum Pharmaceuticals, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.40%
C000012202 | REV Group, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.40%
C000012202 | Nurix Therapeutics, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.40%
C000012202 | Viridian Therapeutics, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.40%
C000012202 | Information Technology
Holdings [Line Items]
Percent of Total Investments	12.10%
C000012202 | Financials
Holdings [Line Items]
Percent of Total Investments	23.10%
C000012202 | Health Care
Holdings [Line Items]
Percent of Total Investments	25.20%
C000012202 | Consumer Discretionary
Holdings [Line Items]
Percent of Total Investments	8.20%
C000012202 | Communication Services
Holdings [Line Items]
Percent of Total Investments	3%
C000012202 | Industrials
Holdings [Line Items]
Percent of Total Investments	13.60%
C000012202 | Consumer Staples
Holdings [Line Items]
Percent of Total Investments	2.20%
C000012202 | Energy
Holdings [Line Items]
Percent of Total Investments	4.30%
C000012202 | Utilities
Holdings [Line Items]
Percent of Total Investments	0.80%
C000012202 | Real Estate
Holdings [Line Items]
Percent of Total Investments	4%
C000012202 | Materials
Holdings [Line Items]
Percent of Total Investments	3.50%
C000012086 | Exxon Mobil Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	10.10%
C000012086 | Chevron Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	9.70%
C000012086 | ConocoPhillips, , , 0
Holdings [Line Items]
Percent of Total Investments	4.40%
C000012086 | Enbridge, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	3.40%
C000012086 | Freeport-McMoRan, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	2.80%
C000012086 | Canadian Natural Resources Ltd., , , 0
Holdings [Line Items]
Percent of Total Investments	2.80%
C000012086 | EOG Resources, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	2.70%
C000012086 | Newmont Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	2.40%
C000012086 | Schlumberger NV, , , 0
Holdings [Line Items]
Percent of Total Investments	2.30%
C000012086 | Williams Cos., Inc. (The), , , 0
Holdings [Line Items]
Percent of Total Investments	2.20%
C000012086 | Oil, Gas & Consumable Fuels
Holdings [Line Items]
Percent of Total Investments	68.40%
C000012086 | Metals & Mining
Holdings [Line Items]
Percent of Total Investments	13.80%
C000012086 | Energy Equipment & Services
Holdings [Line Items]
Percent of Total Investments	7.20%
C000012086 | Containers & Packaging
Holdings [Line Items]
Percent of Total Investments	6.70%
C000012086 | Construction Materials
Holdings [Line Items]
Percent of Total Investments	3.30%
C000012086 | Paper & Forest Products
Holdings [Line Items]
Percent of Total Investments	0.60%
C000012074 | Vaxcyte, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.50%
C000012074 | FTAI Aviation Ltd., , , 0
Holdings [Line Items]
Percent of Total Investments	0.50%
C000012074 | Insmed, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.40%
C000012074 | Sprouts Farmers Market, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.40%
C000012074 | Fabrinet, , , 0
Holdings [Line Items]
Percent of Total Investments	0.30%
C000012074 | Applied Industrial Technologies, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.30%
C000012074 | Mueller Industries, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.30%
C000012074 | Fluor Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	0.30%
C000012074 | Ensign Group, Inc. (The), , , 0
Holdings [Line Items]
Percent of Total Investments	0.30%
C000012074 | UFP Industries, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.30%
C000012074 | Information Technology
Holdings [Line Items]
Percent of Total Investments	12.80%
C000012074 | Financials
Holdings [Line Items]
Percent of Total Investments	17.90%
C000012074 | Health Care
Holdings [Line Items]
Percent of Total Investments	17.50%
C000012074 | Consumer Discretionary
Holdings [Line Items]
Percent of Total Investments	10.10%
C000012074 | Communication Services
Holdings [Line Items]
Percent of Total Investments	2.70%
C000012074 | Industrials
Holdings [Line Items]
Percent of Total Investments	17.10%
C000012074 | Consumer Staples
Holdings [Line Items]
Percent of Total Investments	2.80%
C000012074 | Energy
Holdings [Line Items]
Percent of Total Investments	5.30%
C000012074 | Utilities
Holdings [Line Items]
Percent of Total Investments	2.80%
C000012074 | Real Estate
Holdings [Line Items]
Percent of Total Investments	6.50%
C000012074 | Materials
Holdings [Line Items]
Percent of Total Investments	4.50%
C000012073 | Vaxcyte, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	1%
C000012073 | FTAI Aviation Ltd., , , 0
Holdings [Line Items]
Percent of Total Investments	1%
C000012073 | Insmed, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.80%
C000012073 | Sprouts Farmers Market, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.80%
C000012073 | Fabrinet, , , 0
Holdings [Line Items]
Percent of Total Investments	0.60%
C000012073 | Applied Industrial Technologies, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.60%
C000012073 | Mueller Industries, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.60%
C000012073 | Ensign Group, Inc. (The), , , 0
Holdings [Line Items]
Percent of Total Investments	0.60%
C000012073 | Carpenter Technology Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	0.60%
C000012073 | Lantheus Holdings, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.60%
C000012073 | Information Technology
Holdings [Line Items]
Percent of Total Investments	19.60%
C000012073 | Financials
Holdings [Line Items]
Percent of Total Investments	8.20%
C000012073 | Health Care
Holdings [Line Items]
Percent of Total Investments	25.70%
C000012073 | Consumer Discretionary
Holdings [Line Items]
Percent of Total Investments	10.10%
C000012073 | Communication Services
Holdings [Line Items]
Percent of Total Investments	2%
C000012073 | Industrials
Holdings [Line Items]
Percent of Total Investments	21.80%
C000012073 | Consumer Staples
Holdings [Line Items]
Percent of Total Investments	3.20%
C000012073 | Energy
Holdings [Line Items]
Percent of Total Investments	3.40%
C000012073 | Utilities
Holdings [Line Items]
Percent of Total Investments	0.50%
C000012073 | Real Estate
Holdings [Line Items]
Percent of Total Investments	1.60%
C000012073 | Materials
Holdings [Line Items]
Percent of Total Investments	3.90%
C000012072 | SouthState Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	0.60%
C000012072 | Meritage Homes Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	0.60%
C000012072 | Lumen Technologies, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.50%
C000012072 | Taylor Morrison Home Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	0.50%
C000012072 | Jackson Financial, Inc., A, , 0
Holdings [Line Items]
Percent of Total Investments	0.50%
C000012072 | Essent Group Ltd., , , 0
Holdings [Line Items]
Percent of Total Investments	0.50%
C000012072 | Terreno Realty Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	0.50%
C000012072 | Commercial Metals Co., , , 0
Holdings [Line Items]
Percent of Total Investments	0.50%
C000012072 | Essential Properties Realty Trust, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.50%
C000012072 | Old National Bancorp, , , 0
Holdings [Line Items]
Percent of Total Investments	0.40%
C000012072 | Information Technology
Holdings [Line Items]
Percent of Total Investments	5.90%
C000012072 | Financials
Holdings [Line Items]
Percent of Total Investments	27.80%
C000012072 | Health Care
Holdings [Line Items]
Percent of Total Investments	9.30%
C000012072 | Consumer Discretionary
Holdings [Line Items]
Percent of Total Investments	10%
C000012072 | Communication Services
Holdings [Line Items]
Percent of Total Investments	3.40%
C000012072 | Industrials
Holdings [Line Items]
Percent of Total Investments	12.20%
C000012072 | Consumer Staples
Holdings [Line Items]
Percent of Total Investments	2.30%
C000012072 | Energy
Holdings [Line Items]
Percent of Total Investments	7.20%
C000012072 | Utilities
Holdings [Line Items]
Percent of Total Investments	5.30%
C000012072 | Real Estate
Holdings [Line Items]
Percent of Total Investments	11.50%
C000012072 | Materials
Holdings [Line Items]
Percent of Total Investments	5.10%
C000183467 | iShares Russell 2000 ETF, , , 0
Holdings [Line Items]
Percent of Total Investments	41.80%
C000183467 | Smurfit WestRock plc, , , 0
Holdings [Line Items]
Percent of Total Investments	0.40%
C000183467 | EQT Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	0.30%
C000183467 | EMCOR Group, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.30%
C000183467 | Lennox International, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.30%
C000183467 | Packaging Corp. of America, , , 0
Holdings [Line Items]
Percent of Total Investments	0.30%
C000183467 | NRG Energy, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.30%
C000183467 | Carvana Co., A, , 0
Holdings [Line Items]
Percent of Total Investments	0.30%
C000183467 | Avery Dennison Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	0.30%
C000183467 | FactSet Research Systems, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.30%
C000183467 | Information Technology
Holdings [Line Items]
Percent of Total Investments	6.40%
C000183467 | Financials
Holdings [Line Items]
Percent of Total Investments	9.10%
C000183467 | Health Care
Holdings [Line Items]
Percent of Total Investments	5.50%
C000183467 | Consumer Discretionary
Holdings [Line Items]
Percent of Total Investments	8.50%
C000183467 | Industrials
Holdings [Line Items]
Percent of Total Investments	11.80%
C000183467 | Consumer Staples
Holdings [Line Items]
Percent of Total Investments	2.20%
C000183467 | Energy
Holdings [Line Items]
Percent of Total Investments	2.70%
C000183467 | Real Estate
Holdings [Line Items]
Percent of Total Investments	4.60%
C000183467 | Materials
Holdings [Line Items]
Percent of Total Investments	4.10%
C000183467 | Investment Funds
Holdings [Line Items]
Percent of Total Investments	41.80%
C000183467 | Other Sectors
Holdings [Line Items]
Percent of Total Investments	3.30%
C000012068 | Palantir Technologies, Inc., A, , 0
Holdings [Line Items]
Percent of Total Investments	0.60%
C000012068 | Williams Cos., Inc. (The), , , 0
Holdings [Line Items]
Percent of Total Investments	0.50%
C000012068 | Aflac, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.50%
C000012068 | Arthur J Gallagher & Co., , , 0
Holdings [Line Items]
Percent of Total Investments	0.50%
C000012068 | Hilton Worldwide Holdings, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.50%
C000012068 | DR Horton, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.50%
C000012068 | Realty Income Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	0.50%
C000012068 | Simon Property Group, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.50%
C000012068 | United Rentals, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.50%
C000012068 | ONEOK, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.50%
C000012068 | Information Technology
Holdings [Line Items]
Percent of Total Investments	12.60%
C000012068 | Financials
Holdings [Line Items]
Percent of Total Investments	15.60%
C000012068 | Health Care
Holdings [Line Items]
Percent of Total Investments	10.20%
C000012068 | Consumer Discretionary
Holdings [Line Items]
Percent of Total Investments	10.90%
C000012068 | Communication Services
Holdings [Line Items]
Percent of Total Investments	3.40%
C000012068 | Industrials
Holdings [Line Items]
Percent of Total Investments	17.40%
C000012068 | Consumer Staples
Holdings [Line Items]
Percent of Total Investments	5%
C000012068 | Energy
Holdings [Line Items]
Percent of Total Investments	5%
C000012068 | Utilities
Holdings [Line Items]
Percent of Total Investments	5.80%
C000012068 | Real Estate
Holdings [Line Items]
Percent of Total Investments	8.20%
C000012068 | Materials
Holdings [Line Items]
Percent of Total Investments	5.90%
C000012066 | Palantir Technologies, Inc., A, , 0
Holdings [Line Items]
Percent of Total Investments	2.70%
C000012066 | Trade Desk, Inc. (The), A, , 0
Holdings [Line Items]
Percent of Total Investments	1.70%
C000012066 | NU Holdings Ltd., A, , 0
Holdings [Line Items]
Percent of Total Investments	1.50%
C000012066 | Monolithic Power Systems, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	1.50%
C000012066 | Ameriprise Financial, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	1.50%
C000012066 | IDEXX Laboratories, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	1.50%
C000012066 | Vistra Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	1.50%
C000012066 | WW Grainger, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	1.40%
C000012066 | Old Dominion Freight Line, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	1.40%
C000012066 | Fair Isaac Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	1.40%
C000012066 | Information Technology
Holdings [Line Items]
Percent of Total Investments	24.70%
C000012066 | Financials
Holdings [Line Items]
Percent of Total Investments	12.50%
C000012066 | Health Care
Holdings [Line Items]
Percent of Total Investments	13.80%
C000012066 | Consumer Discretionary
Holdings [Line Items]
Percent of Total Investments	15.50%
C000012066 | Communication Services
Holdings [Line Items]
Percent of Total Investments	4.40%
C000012066 | Industrials
Holdings [Line Items]
Percent of Total Investments	18.20%
C000012066 | Consumer Staples
Holdings [Line Items]
Percent of Total Investments	2.50%
C000012066 | Energy
Holdings [Line Items]
Percent of Total Investments	3.90%
C000012066 | Utilities
Holdings [Line Items]
Percent of Total Investments	1.70%
C000012066 | Real Estate
Holdings [Line Items]
Percent of Total Investments	1.40%
C000012066 | Materials
Holdings [Line Items]
Percent of Total Investments	1.40%
C000012038 | EMCOR Group, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	1.30%
C000012038 | Lennox International, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	1.30%
C000012038 | Carlisle Cos., Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	1.40%
C000012038 | Williams-Sonoma, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	1.30%
C000012038 | Manhattan Associates, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	1.20%
C000012038 | Watsco, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	1.10%
C000012038 | Dynatrace, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	1.10%
C000012038 | Reliance, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	1.10%
C000012038 | Toll Brothers, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	1.10%
C000012038 | Pure Storage, Inc., A, , 0
Holdings [Line Items]
Percent of Total Investments	1%
C000012038 | Information Technology
Holdings [Line Items]
Percent of Total Investments	11.10%
C000012038 | Financials
Holdings [Line Items]
Percent of Total Investments	9.60%
C000012038 | Health Care
Holdings [Line Items]
Percent of Total Investments	10.10%
C000012038 | Consumer Discretionary
Holdings [Line Items]
Percent of Total Investments	18%
C000012038 | Communication Services
Holdings [Line Items]
Percent of Total Investments	1.30%
C000012038 | Industrials
Holdings [Line Items]
Percent of Total Investments	29.60%
C000012038 | Consumer Staples
Holdings [Line Items]
Percent of Total Investments	3.40%
C000012038 | Energy
Holdings [Line Items]
Percent of Total Investments	5.80%
C000012038 | Utilities
Holdings [Line Items]
Percent of Total Investments	0.50%
C000012038 | Real Estate
Holdings [Line Items]
Percent of Total Investments	4.90%
C000012038 | Materials
Holdings [Line Items]
Percent of Total Investments	5.70%
C000012039 | Illumina, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	1.50%
C000012039 | Chesapeake Energy Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	1.20%
C000012039 | Fidelity National Financial, Inc., A, , 0
Holdings [Line Items]
Percent of Total Investments	1.10%
C000012039 | Tenet Healthcare Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	1.10%
C000012039 | US Foods Holding Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	1.10%
C000012039 | Reinsurance Group of America, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	1%
C000012039 | WP Carey, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	1%
C000012039 | Coherent Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	1%
C000012039 | Jones Lang LaSalle, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.90%
C000012039 | Performance Food Group Co., , , 0
Holdings [Line Items]
Percent of Total Investments	0.90%
C000012039 | Information Technology
Holdings [Line Items]
Percent of Total Investments	7.10%
C000012039 | Financials
Holdings [Line Items]
Percent of Total Investments	23.90%
C000012039 | Health Care
Holdings [Line Items]
Percent of Total Investments	9.70%
C000012039 | Consumer Discretionary
Holdings [Line Items]
Percent of Total Investments	10.60%
C000012039 | Communication Services
Holdings [Line Items]
Percent of Total Investments	1.60%
C000012039 | Industrials
Holdings [Line Items]
Percent of Total Investments	15.10%
C000012039 | Consumer Staples
Holdings [Line Items]
Percent of Total Investments	5.30%
C000012039 | Energy
Holdings [Line Items]
Percent of Total Investments	4.20%
C000012039 | Utilities
Holdings [Line Items]
Percent of Total Investments	4.90%
C000012039 | Real Estate
Holdings [Line Items]
Percent of Total Investments	10.20%
C000012039 | Materials
Holdings [Line Items]
Percent of Total Investments	7.40%
C000012044 | Mueller Industries, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	1.30%
C000012044 | Carpenter Technology Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	1.20%
C000012044 | Meritage Homes Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	1.10%
C000012044 | ATI, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	1.20%
C000012044 | SPX Technologies, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	1.10%
C000012044 | SPS Commerce, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	1.10%
C000012044 | Glaukos Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	1.10%
C000012044 | Badger Meter, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	1%
C000012044 | CSW Industrials, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	0.90%
C000012044 | Moog, Inc., A, , 0
Holdings [Line Items]
Percent of Total Investments	0.90%
C000012044 | Information Technology
Holdings [Line Items]
Percent of Total Investments	14.30%
C000012044 | Financials
Holdings [Line Items]
Percent of Total Investments	10.70%
C000012044 | Health Care
Holdings [Line Items]
Percent of Total Investments	13.50%
C000012044 | Consumer Discretionary
Holdings [Line Items]
Percent of Total Investments	16.10%
C000012044 | Communication Services
Holdings [Line Items]
Percent of Total Investments	3.20%
C000012044 | Industrials
Holdings [Line Items]
Percent of Total Investments	19.20%
C000012044 | Consumer Staples
Holdings [Line Items]
Percent of Total Investments	2.70%
C000012044 | Energy
Holdings [Line Items]
Percent of Total Investments	6.80%
C000012044 | Utilities
Holdings [Line Items]
Percent of Total Investments	1.60%
C000012044 | Real Estate
Holdings [Line Items]
Percent of Total Investments	5.30%
C000012044 | Materials
Holdings [Line Items]
Percent of Total Investments	6.60%
C000012084 | NVIDIA Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	8.10%
C000012084 | Broadcom, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	8.50%
C000012084 | Advanced Micro Devices, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	8.80%
C000012084 | Monolithic Power Systems, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	4%
C000012084 | QUALCOMM, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	6.10%
C000012084 | Texas Instruments, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	6%
C000012084 | Micron Technology, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	4.30%
C000012084 | Intel Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	4.30%
C000012084 | Applied Materials, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	4.10%
C000012084 | Lam Research Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	4%
C000012084 | Semiconductors & Semiconductor Equipment
Holdings [Line Items]
Percent of Total Investments	100%
C000012083 | Equinix, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	9.90%
C000012083 | Digital Realty Trust, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	9.90%
C000012083 | Crown Castle, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	9.20%
C000012083 | American Tower Corp., , , 0
Holdings [Line Items]
Percent of Total Investments	9.20%
C000012083 | Fastly, Inc., A, , 0
Holdings [Line Items]
Percent of Total Investments	6.20%
C000012083 | Arista Networks, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	4.90%
C000012083 | Uniti Group, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	4.60%
C000012083 | Nokia OYJ, , , 0
Holdings [Line Items]
Percent of Total Investments	4.50%
C000012083 | Telefonaktiebolaget LM Ericsson, , , 0
Holdings [Line Items]
Percent of Total Investments	4.50%
C000012083 | Motorola Solutions, Inc., , , 0
Holdings [Line Items]
Percent of Total Investments	4.50%
C000012083 | Software
Holdings [Line Items]
Percent of Total Investments	1%
C000012083 | Semiconductors & Semiconductor Equipment
Holdings [Line Items]
Percent of Total Investments	8.30%
C000012083 | Technology Hardware, Storage & Peripherals
Holdings [Line Items]
Percent of Total Investments	6.80%
C000012083 | IT Services
Holdings [Line Items]
Percent of Total Investments	6.20%
C000012083 | Communications Equipment
Holdings [Line Items]
Percent of Total Investments	30.80%
C000012083 | Specialized REITs
Holdings [Line Items]
Percent of Total Investments	46.90%