iShares Semiconductor ETF (SOXX) N-CSRS3 Dec 24Certified semi-annual shareholder report (management investment company)Financial data

Company Profile

Form N-CSR Cover

Form N-CSR Cover	6 Months Ended
Form N-CSR Cover	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	2 Months Ended	6 Months Ended
Shareholder Report	Sep. 30, 2024 USD ($) Holding	Sep. 30, 2024 USD ($) 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
C000025777
Shareholder Report [Line Items]
Fund Name		iShares U.S. Aerospace & Defense ETF
Trading Symbol		ITA
Security Exchange Name		CboeBZX
Annual or Semi-Annual Statement [Text Block]		This semi-annual shareholder report contains important information about iShares U.S. Aerospace & Defense 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		1-800-474-2737
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: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-C19"><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: 12.8px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>
Expenses [Text Block]		What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares U.S. Aerospace & Defense ETF $20 0.38% Footnote Reference ⁽ᵃ⁾ Annualized.
Expenses Paid, Amount		$ 20
Expense Ratio, Percent		0.38%
Performance Past Does Not Indicate Future [Text]		Past performance is not an indication of future results.
Line Graph [Table Text Block]		Fund performance
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.
AssetsNet	$ 6,174,066,005	$ 6,174,066,005
Holdings Count \| Holding	38	38
InvestmentCompanyPortfolioTurnover		27%
Additional Fund Statistics [Text Block]		Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $6,174,066,005 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 38 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 27%
Holdings [Text Block]		Industry allocation Industry Percent of Total Investments Footnote Reference Aerospace & Defense ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 99.8 % Leisure Products ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.2
Largest Holdings [Text Block]		Ten largest holdings Security Percent of Total Investments Footnote Reference General Electric Co ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 19.3 % RTX Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 15.2 Lockheed Martin Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.9 Axon Enterprise, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.7 TransDigm Group, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.6 Howmet Aerospace, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.5 L3Harris Technologies, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.5 Northrop Grumman Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.4 General Dynamics Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.3 Boeing Co. (The) ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.0
C000025774
Shareholder Report [Line Items]
Fund Name		iShares U.S. Broker-Dealers & Securities Exchanges ETF
Trading Symbol		IAI
Security Exchange Name		NYSEArca
Annual or Semi-Annual Statement [Text Block]		This semi-annual shareholder report contains important information about iShares U.S. Broker-Dealers & Securities Exchanges 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		1-800-474-2737
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: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-C41"><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: 12.8px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>
Expenses [Text Block]		What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares U.S. Broker-Dealers & Securities Exchanges ETF $20 0.38% Footnote Reference ⁽ᵃ⁾ Annualized.
Expenses Paid, Amount		$ 20
Expense Ratio, Percent		0.38%
Performance Past Does Not Indicate Future [Text]		Past performance is not an indication of future results.
Line Graph [Table Text Block]		Fund performance
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.
AssetsNet	$ 1,355,579,658	$ 1,355,579,658
Holdings Count \| Holding	36	36
InvestmentCompanyPortfolioTurnover		8%
Additional Fund Statistics [Text Block]		Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $1,355,579,658 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 36 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8%
Holdings [Text Block]		Industry allocation Industry Percent of Total Investments Footnote Reference Financial Exchanges & Data ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 51.4 % Investment Banking & Brokerage ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 48.6
Largest Holdings [Text Block]		Ten largest holdings Security Percent of Total Investments Footnote Reference S&P Global, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 14.7 % Goldman Sachs Group, Inc. (The) ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 13.9 Morgan Stanley ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 11.5 Coinbase Global, Inc., Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.9 Charles Schwab Corp. (The) ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.5 MSCI, Inc., Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.5 CME Group, Inc., Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.3 Intercontinental Exchange, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.3 Moody's Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.3 Nasdaq, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.2
C000025772
Shareholder Report [Line Items]
Fund Name		iShares U.S. Healthcare Providers ETF
Trading Symbol		IHF
Security Exchange Name		NYSEArca
Annual or Semi-Annual Statement [Text Block]		This semi-annual shareholder report contains important information about iShares U.S. Healthcare Providers 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		1-800-474-2737
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: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-C63"><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: 12.8px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>
Expenses [Text Block]		What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares U.S. Healthcare Providers ETF $20 0.38% Footnote Reference ⁽ᵃ⁾ Annualized.
Expenses Paid, Amount		$ 20
Expense Ratio, Percent		0.38%
Performance Past Does Not Indicate Future [Text]		Past performance is not an indication of future results.
Line Graph [Table Text Block]		Fund performance
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.
AssetsNet	$ 779,300,698	$ 779,300,698
Holdings Count \| Holding	70	70
InvestmentCompanyPortfolioTurnover		6%
Additional Fund Statistics [Text Block]		Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $779,300,698 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 70 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6%
Holdings [Text Block]		Industry allocation Industry Percent of Total Investments Footnote Reference Managed Health Care ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 49.7 % Health Care Services ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 28.4 Health Care Facilities ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 15.1 Health Care Technology ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.8
Largest Holdings [Text Block]		Ten largest holdings Security Percent of Total Investments Footnote Reference UnitedHealth Group, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 22.3 % Elevance Health, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 13.6 Cigna Group (The) ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.0 CVS Health Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.0 HCA Healthcare, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.7 Centene Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.6 Humana, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.3 Veeva Systems, Inc., Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.2 Molina Healthcare, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.2 Labcorp Holdings, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.9
C000025769
Shareholder Report [Line Items]
Fund Name		iShares U.S. Home Construction ETF
Trading Symbol		ITB
Security Exchange Name		CboeBZX
Annual or Semi-Annual Statement [Text Block]		This semi-annual shareholder report contains important information about iShares U.S. Home Construction 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		1-800-474-2737
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: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-C85"><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: 12.8px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>
Expenses [Text Block]		What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares U.S. Home Construction ETF $20 0.38% Footnote Reference ⁽ᵃ⁾ Annualized.
Expenses Paid, Amount		$ 20
Expense Ratio, Percent		0.38%
Performance Past Does Not Indicate Future [Text]		Past performance is not an indication of future results.
Line Graph [Table Text Block]		Fund performance
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.
AssetsNet	$ 3,629,808,529	$ 3,629,808,529
Holdings Count \| Holding	47	47
InvestmentCompanyPortfolioTurnover		6%
Additional Fund Statistics [Text Block]		Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $3,629,808,529 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 47 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6%
Holdings [Text Block]		Industry allocation Industry Percent of Total Investments Footnote Reference Homebuilding ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 64.5 % Building Products ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 16.7 Home Improvement Retail ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.9 Specialty Chemicals ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.3 Home Furnishings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.5 Construction Materials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.3 Trading Companies & Distributors ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.7 Homefurnishing Retail ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.1
Largest Holdings [Text Block]		Ten largest holdings Security Percent of Total Investments Footnote Reference DR Horton, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 14.7 % Lennar Corp., Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 11.9 NVR, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.9 PulteGroup, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.8 Lowe's Companies, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.6 Home Depot, Inc. (The) ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.6 Sherwin-Williams Co. (The) ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.3 Toll Brothers, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.2 TopBuild Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.2 Builders FirstSource, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.0
C000198491
Shareholder Report [Line Items]
Fund Name		iShares U.S. Infrastructure ETF
Trading Symbol		IFRA
Security Exchange Name		CboeBZX
Annual or Semi-Annual Statement [Text Block]		This semi-annual shareholder report contains important information about iShares U.S. Infrastructure 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		1-800-474-2737
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: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-C107"><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: 12.8px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>
Expenses [Text Block]		What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares U.S. Infrastructure ETF $16 0.30% Footnote Reference ⁽ᵃ⁾ Annualized.
Expenses Paid, Amount		$ 16
Expense Ratio, Percent		0.30%
Performance Past Does Not Indicate Future [Text]		Past performance is not an indication of future results.
Line Graph [Table Text Block]		Fund performance
Performance Inception Date		Apr. 03, 2018
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.
AssetsNet	$ 2,767,786,251	$ 2,767,786,251
Holdings Count \| Holding	166	166
InvestmentCompanyPortfolioTurnover		11%
Additional Fund Statistics [Text Block]		Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $2,767,786,251 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 166 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 11%
Holdings [Text Block]		Industry allocation Industry Percent of Total Investments Footnote Reference Electric Utilities ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 18.6 % Construction & Engineering ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 13.2 Multi-Utilities ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.7 Steel ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.1 Oil & Gas Storage & Transportation ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.9 Building Products ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.3 Water Utilities ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.5 Gas Utilities ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.1 Commodity Chemicals ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.8 Construction Materials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.6 Other Footnote Reference ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 20.2
Largest Holdings [Text Block]		Ten largest holdings Security Percent of Total Investments Footnote Reference Vistra Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.1 % Constellation Energy Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.0 NRG Energy, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.8 Public Service Enterprise Group, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.8 ONE Gas, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.7 Compass Minerals International, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.7 Entergy Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.7 CenterPoint Energy, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.7 TXNM Energy, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.7 Exelon Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.7
C000025775
Shareholder Report [Line Items]
Fund Name		iShares U.S. Insurance ETF
Trading Symbol		IAK
Security Exchange Name		NYSEArca
Annual or Semi-Annual Statement [Text Block]		This semi-annual shareholder report contains important information about iShares U.S. Insurance 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		1-800-474-2737
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: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-C130"><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: 12.8px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>
Expenses [Text Block]		What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares U.S. Insurance ETF $20 0.38% Footnote Reference ⁽ᵃ⁾ Annualized.
Expenses Paid, Amount		$ 20
Expense Ratio, Percent		0.38%
Performance Past Does Not Indicate Future [Text]		Past performance is not an indication of future results.
Line Graph [Table Text Block]		Fund performance
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.
AssetsNet	$ 761,862,668	$ 761,862,668
Holdings Count \| Holding	55	55
InvestmentCompanyPortfolioTurnover		7%
Additional Fund Statistics [Text Block]		Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $761,862,668 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 55 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7%
Holdings [Text Block]		Industry allocation Industry Percent of Total Investments Footnote Reference Property & Casualty Insurance ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 71.9 % Life & Health Insurance ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 23.5 Multi-line Insurance ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.6
Largest Holdings [Text Block]		Ten largest holdings Security Percent of Total Investments Footnote Reference Progressive Corp. (The) ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 16.5 % Chubb Ltd. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 12.1 Aflac, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.3 Travelers Companies, Inc. (The) ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.9 MetLife, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.8 Prudential Financial, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.6 Allstate Corp. (The) ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.5 Arch Capital Group Ltd. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.4 American International Group, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.4 Hartford Financial Services Group, Inc. (The) ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.2
C000251033
Shareholder Report [Line Items]
Fund Name	iShares U.S. Manufacturing ETF
Trading Symbol	MADE
Security Exchange Name	NYSEArca
Annual or Semi-Annual Statement [Text Block]	This semi-annual shareholder report contains important information about iShares U.S. Manufacturing ETF (the “Fund”) for the period of July 17, 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	1-800-474-2737
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: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-B152"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 12.8px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>
Expenses Paid, Amount	$ 8
Expense Ratio, Percent	0.40%
AssetsNet	$ 5,985,211	$ 5,985,211
Holdings Count \| Holding	100	100
InvestmentCompanyPortfolioTurnover	3%
C000025773
Shareholder Report [Line Items]
Fund Name		iShares U.S. Medical Devices ETF
Trading Symbol		IHI
Security Exchange Name		NYSEArca
Annual or Semi-Annual Statement [Text Block]		This semi-annual shareholder report contains important information about iShares U.S. Medical Devices 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		1-800-474-2737
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: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-C167"><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: 12.8px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>
Expenses [Text Block]		What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares U.S. Medical Devices ETF $19 0.38% Footnote Reference ⁽ᵃ⁾ Annualized.
Expenses Paid, Amount		$ 19
Expense Ratio, Percent		0.38%
Performance Past Does Not Indicate Future [Text]		Past performance is not an indication of future results.
Line Graph [Table Text Block]		Fund performance
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.
AssetsNet	$ 4,974,875,851	$ 4,974,875,851
Holdings Count \| Holding	52	52
InvestmentCompanyPortfolioTurnover		6%
Additional Fund Statistics [Text Block]		Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $4,974,875,851 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 52 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6%
Holdings [Text Block]		Industry allocation Industry Percent of Total Investments Footnote Reference Health Care Equipment ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 100.0 %
Largest Holdings [Text Block]		Ten largest holdings Security Percent of Total Investments Footnote Reference Abbott Laboratories ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 16.6 % Intuitive Surgical, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 14.6 Stryker Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.4 GE HealthCare Technologies, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.1 Becton Dickinson & Co. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.6 IDEXX Laboratories, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.6 Boston Scientific Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.5 Medtronic PLC ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.5 Edwards Lifesciences Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.3 ResMed, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.2
C000025768
Shareholder Report [Line Items]
Fund Name		iShares U.S. Oil & Gas Exploration & Production ETF
Trading Symbol		IEO
Security Exchange Name		CboeBZX
Annual or Semi-Annual Statement [Text Block]		This semi-annual shareholder report contains important information about iShares U.S. Oil & Gas Exploration & Production 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		1-800-474-2737
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: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-C189"><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: 12.8px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>
Expenses [Text Block]		What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares U.S. Oil & Gas Exploration & Production ETF $18 0.38% Footnote Reference ⁽ᵃ⁾ Annualized.
Expenses Paid, Amount		$ 18
Expense Ratio, Percent		0.38%
Performance Past Does Not Indicate Future [Text]		Past performance is not an indication of future results.
Line Graph [Table Text Block]		Fund performance
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.
AssetsNet	$ 598,848,767	$ 598,848,767
Holdings Count \| Holding	50	50
InvestmentCompanyPortfolioTurnover		12%
Additional Fund Statistics [Text Block]		Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $598,848,767 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 50 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 12%
Holdings [Text Block]		Industry allocation Industry Percent of Total Investments Footnote Reference Oil & Gas Exploration & Production ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 77.5 % Oil & Gas Refining & Marketing ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 22.5
Largest Holdings [Text Block]		Ten largest holdings Security Percent of Total Investments Footnote Reference ConocoPhillips ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 18.8 % EOG Resources, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.8 Marathon Petroleum Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.4 Phillips 66 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.6 Diamondback Energy, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.6 Hess Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.6 Valero Energy Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.4 Devon Energy Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.2 EQT Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.9 Coterra Energy, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.2
C000025770
Shareholder Report [Line Items]
Fund Name		iShares U.S. Oil Equipment & Services ETF
Trading Symbol		IEZ
Security Exchange Name		NYSEArca
Annual or Semi-Annual Statement [Text Block]		This semi-annual shareholder report contains important information about iShares U.S. Oil Equipment & Services 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		1-800-474-2737
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: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-C211"><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: 12.8px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>
Expenses [Text Block]		What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares U.S. Oil Equipment & Services ETF $18 0.38% Footnote Reference ⁽ᵃ⁾ Annualized.
Expenses Paid, Amount		$ 18
Expense Ratio, Percent		0.38%
Performance Past Does Not Indicate Future [Text]		Past performance is not an indication of future results.
Line Graph [Table Text Block]		Fund performance
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.
AssetsNet	$ 135,732,242	$ 135,732,242
Holdings Count \| Holding	32	32
InvestmentCompanyPortfolioTurnover		16%
Additional Fund Statistics [Text Block]		Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $135,732,242 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 32 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 16%
Holdings [Text Block]		Industry allocation Industry Percent of Total Investments Footnote Reference Oil & Gas Equipment & Services ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 85.8 % Oil & Gas Drilling ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 14.2
Largest Holdings [Text Block]		Ten largest holdings Security Percent of Total Investments Footnote Reference Schlumberger N.V. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 22.5 % Baker Hughes Co., Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 20.4 TechnipFMC PLC ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.7 ChampionX Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.5 Halliburton Co. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.4 NOV, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.3 Weatherford International PLC ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.0 Noble Corp. PLC, Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.8 Cactus, Inc., Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.1 Valaris, Ltd. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.9
C000025771
Shareholder Report [Line Items]
Fund Name		iShares U.S. Pharmaceuticals ETF
Trading Symbol		IHE
Security Exchange Name		NYSEArca
Annual or Semi-Annual Statement [Text Block]		This semi-annual shareholder report contains important information about iShares U.S. Pharmaceuticals 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		1-800-474-2737
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: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-C233"><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: 12.8px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>
Expenses [Text Block]		What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares U.S. Pharmaceuticals ETF $20 0.38% Footnote Reference ⁽ᵃ⁾ Annualized.
Expenses Paid, Amount		$ 20
Expense Ratio, Percent		0.38%
Performance Past Does Not Indicate Future [Text]		Past performance is not an indication of future results.
Line Graph [Table Text Block]		Fund performance
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.
AssetsNet	$ 660,090,337	$ 660,090,337
Holdings Count \| Holding	41	41
InvestmentCompanyPortfolioTurnover		7%
Additional Fund Statistics [Text Block]		Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $660,090,337 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 41 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7%
Holdings [Text Block]		Industry allocation Industry Percent of Total Investments Footnote Reference Pharmaceuticals ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 100.0 %
Largest Holdings [Text Block]		Ten largest holdings Security Percent of Total Investments Footnote Reference Johnson & Johnson ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 22.1 % Eli Lilly & Co. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 21.6 Bristol-Myers Squibb Co. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.8 Zoetis, Inc., Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.6 Viatris, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.6 Merck & Co., Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.5 Pfizer, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.4 Royalty Pharma PLC, Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.3 Catalent, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.3 Elanco Animal Health, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.8
C000012058
Shareholder Report [Line Items]
Fund Name		iShares U.S. Real Estate ETF
Trading Symbol		IYR
Security Exchange Name		NYSEArca
Annual or Semi-Annual Statement [Text Block]		This semi-annual shareholder report contains important information about iShares U.S. 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		1-800-474-2737
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: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-C255"><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: 12.8px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>
Expenses [Text Block]		What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares U.S. Real Estate ETF $20 0.38% Footnote Reference ⁽ᵃ⁾ Annualized.
Expenses Paid, Amount		$ 20
Expense Ratio, Percent		0.38%
Performance Past Does Not Indicate Future [Text]		Past performance is not an indication of future results.
Line Graph [Table Text Block]		Fund performance
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.
AssetsNet	$ 4,734,396,100	$ 4,734,396,100
Holdings Count \| Holding	68	68
InvestmentCompanyPortfolioTurnover		6%
Additional Fund Statistics [Text Block]		Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $4,734,396,100 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 68 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6%
Holdings [Text Block]		Industry allocation Industry Percent of Total Investments Footnote Reference Telecom Tower REITs ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 13.3 % Retail REITs ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 12.1 Industrial REITs ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 11.6 Health Care REITs ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.4 Data Center REITs ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.6 Multi-Family Residential REITs ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.7 Self-Storage REITs ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.7 Other Specialized REITs ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.9 Real Estate Services ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.8 Single-Family Residential REITs ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.4 Other Footnote Reference ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.5
Largest Holdings [Text Block]		Ten largest holdings Security Percent of Total Investments Footnote Reference Prologis, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.3 % American Tower Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.7 Equinix, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.0 Welltower, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.5 Public Storage ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.1 Realty Income Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.0 Simon Property Group, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.7 Crown Castle, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.7 Digital Realty Trust, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.6 Extra Space Storage, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.7
C000025776
Shareholder Report [Line Items]
Fund Name		iShares U.S. Regional Banks ETF
Trading Symbol		IAT
Security Exchange Name		NYSEArca
Annual or Semi-Annual Statement [Text Block]		This semi-annual shareholder report contains important information about iShares U.S. Regional Banks 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		1-800-474-2737
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: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-C277"><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: 12.8px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>
Expenses [Text Block]		What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares U.S. Regional Banks ETF $20 0.38% Footnote Reference ⁽ᵃ⁾ Annualized.
Expenses Paid, Amount		$ 20
Expense Ratio, Percent		0.38%
Performance Past Does Not Indicate Future [Text]		Past performance is not an indication of future results.
Line Graph [Table Text Block]		Fund performance
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.
AssetsNet	$ 606,176,391	$ 606,176,391
Holdings Count \| Holding	36	36
InvestmentCompanyPortfolioTurnover		4%
Additional Fund Statistics [Text Block]		Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $606,176,391 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 36 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4%
Holdings [Text Block]		Industry allocation Industry Percent of Total Investments Footnote Reference Regional Banks ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 57.4 % Diversified Banks ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 42.6
Largest Holdings [Text Block]		Ten largest holdings Security Percent of Total Investments Footnote Reference PNC Financial Services Group, Inc. (The) ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 14.4 % U.S. Bancorp ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 14.0 Truist Financial Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 11.2 Fifth Third Bancorp ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.0 M&T Bank Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.6 First Citizens BancShares, Inc., Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.4 Huntington Bancshares, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.4 Regions Financial Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.4 Citizens Financial Group, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.8 KeyCorp ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.2
C000012063
Shareholder Report [Line Items]
Fund Name		iShares U.S. Telecommunications ETF
Trading Symbol		IYZ
Security Exchange Name		CboeBZX
Annual or Semi-Annual Statement [Text Block]		This semi-annual shareholder report contains important information about iShares U.S. Telecommunications 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		1-800-474-2737
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: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-C299"><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: 12.8px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>
Expenses [Text Block]		What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares U.S. Telecommunications ETF $21 0.38% Footnote Reference ⁽ᵃ⁾ Annualized.
Expenses Paid, Amount		$ 21
Expense Ratio, Percent		0.38%
Performance Past Does Not Indicate Future [Text]		Past performance is not an indication of future results.
Line Graph [Table Text Block]		Fund performance
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.
AssetsNet	$ 255,230,051	$ 255,230,051
Holdings Count \| Holding	22	22
InvestmentCompanyPortfolioTurnover		21%
Additional Fund Statistics [Text Block]		Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $255,230,051 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 22 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 21%
Holdings [Text Block]		Industry allocation Industry Percent of Total Investments Footnote Reference Communications Equipment ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 40.9 % Integrated Telecommunication Services ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 30.7 Cable & Satellite ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 12.7 Alternative Carriers ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.8 Wireless Telecommunication Services ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.1 Movies & Entertainment ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.8
Largest Holdings [Text Block]		Ten largest holdings Security Percent of Total Investments Footnote Reference Cisco Systems, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 16.8 % Verizon Communications, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 14.8 AT&T, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 12.5 Comcast Corp., Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.5 Arista Networks, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.4 Lumentum Holdings, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.1 T-Mobile U.S., Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.1 Ciena Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.1 Liberty Broadband Corp., Class C, NVS ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.0 Motorola Solutions, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.0
C000012077
Shareholder Report [Line Items]
Fund Name		iShares Russell 1000 ETF
Trading Symbol		IWB
Security Exchange Name		NYSEArca
Annual or Semi-Annual Statement [Text Block]		This semi-annual shareholder report contains important information about iShares Russell 1000 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		1-800-474-2737
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: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-C321"><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: 12.8px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>
Expenses [Text Block]		What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares Russell 1000 ETF $8 0.15% Footnote Reference ⁽ᵃ⁾ Annualized.
Expenses Paid, Amount		$ 8
Expense Ratio, Percent		0.15%
Performance Past Does Not Indicate Future [Text]		Past performance is not an indication of future results.
Line Graph [Table Text Block]		Fund performance
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.
AssetsNet	$ 37,852,547,771	$ 37,852,547,771
Holdings Count \| Holding	1,015	1,015
InvestmentCompanyPortfolioTurnover		2%
Additional Fund Statistics [Text Block]		Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $37,852,547,771 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1,015 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2%
Holdings [Text Block]		Sector allocation Sector Percent of Total Investments Footnote Reference Information Technology ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 29.8 % Financials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 13.4 Health Care ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 11.5 Consumer Discretionary ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.4 Industrials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.4 Communication Services ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.7 Consumer Staples ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.7 Energy ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.4 Real Estate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.7 Materials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.6 Utilities ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.4
Largest Holdings [Text Block]		Ten largest holdings Security Percent of Total Investments Footnote Reference Apple, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.4 % Microsoft Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.1 NVIDIA Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.4 Amazon.com, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.3 Meta Platforms, Inc., Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.4 Alphabet, Inc., Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.8 Berkshire Hathaway, Inc., Class B ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.6 Alphabet, Inc., Class C, NVS ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.6 Broadcom, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.5 Tesla, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.4
C000012076
Shareholder Report [Line Items]
Fund Name		iShares Russell 1000 Growth ETF
Trading Symbol		IWF
Security Exchange Name		NYSEArca
Annual or Semi-Annual Statement [Text Block]		This semi-annual shareholder report contains important information about iShares Russell 1000 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		1-800-474-2737
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: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-C343"><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: 12.8px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>
Expenses [Text Block]		What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares Russell 1000 Growth ETF $10 0.18% Footnote Reference ⁽ᵃ⁾ Annualized.
Expenses Paid, Amount		$ 10
Expense Ratio, Percent		0.18%
Performance Past Does Not Indicate Future [Text]		Past performance is not an indication of future results.
Line Graph [Table Text Block]		Fund performance
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.
AssetsNet	$ 99,185,151,292	$ 99,185,151,292
Holdings Count \| Holding	397	397
InvestmentCompanyPortfolioTurnover		11%
Additional Fund Statistics [Text Block]		Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $99,185,151,292 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 397 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 11%
Holdings [Text Block]		Sector allocation Sector Percent of Total Investments Footnote Reference Information Technology ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 48.8 % Consumer Discretionary ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 14.2 Communication Services ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 12.8 Health Care ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.8 Financials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.3 Industrials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.6 Consumer Staples ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.6 Materials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.7 Real Estate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.6 Energy ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.4 Utilities ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.2
Largest Holdings [Text Block]		Ten largest holdings Security Percent of Total Investments Footnote Reference Apple, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 12.3 % Microsoft Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 11.6 NVIDIA Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.3 Amazon.com, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.3 Meta Platforms, Inc., Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.6 Alphabet, Inc., Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.5 Alphabet, Inc., Class C, NVS ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.0 Broadcom, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.8 Tesla, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.6 Eli Lilly & Co. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.6
C000012075
Shareholder Report [Line Items]
Fund Name		iShares Russell 1000 Value ETF
Trading Symbol		IWD
Security Exchange Name		NYSEArca
Annual or Semi-Annual Statement [Text Block]		This semi-annual shareholder report contains important information about iShares Russell 1000 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		1-800-474-2737
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: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-C365"><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: 12.8px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>
Expenses [Text Block]		What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares Russell 1000 Value ETF $9 0.18% Footnote Reference ⁽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.
Line Graph [Table Text Block]		Fund performance
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.
AssetsNet	$ 60,449,811,073	$ 60,449,811,073
Holdings Count \| Holding	876	876
InvestmentCompanyPortfolioTurnover		14%
Additional Fund Statistics [Text Block]		Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $60,449,811,073 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 876 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 14%
Holdings [Text Block]		Sector allocation Sector Percent of Total Investments Footnote Reference Financials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 21.2 % Health Care ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 15.5 Industrials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 14.7 Information Technology ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.1 Consumer Staples ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.0 Energy ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.7 Consumer Discretionary ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.3 Real Estate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.9 Utilities ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.8 Materials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.6 Communication Services ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.2
Largest Holdings [Text Block]		Ten largest holdings Security Percent of Total Investments Footnote Reference Berkshire Hathaway, Inc., Class B ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.3 % JPMorgan Chase & Co. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.4 Exxon Mobil Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.1 UnitedHealth Group, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.0 Johnson & Johnson ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.5 Walmart, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.4 Procter & Gamble Co. (The) ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.3 Bank of America Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.1 Chevron Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.0 Thermo Fisher Scientific, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.9
C000210345
Shareholder Report [Line Items]
Fund Name		iShares Focused Value Factor ETF
Trading Symbol		FOVL
Security Exchange Name		NYSEArca
Annual or Semi-Annual Statement [Text Block]		This semi-annual shareholder report contains important information about iShares Focused Value Factor 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		1-800-474-2737
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: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-C387"><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: 12.8px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>
Expenses [Text Block]		What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares Focused Value Factor ETF $13 0.25% Footnote Reference ⁽ᵃ⁾ Annualized.
Expenses Paid, Amount		$ 13
Expense Ratio, Percent		0.25%
Performance Past Does Not Indicate Future [Text]		Past performance is not an indication of future results.
Line Graph [Table Text Block]		Fund performance
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.
AssetsNet	$ 23,857,843	$ 23,857,843
Holdings Count \| Holding	42	42
InvestmentCompanyPortfolioTurnover		3%
Additional Fund Statistics [Text Block]		Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $23,857,843 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 42 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3%
Holdings [Text Block]		Sector allocation Sector Percent of Total Investments Footnote Reference Financials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 51.9 % Materials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 11.0 Consumer Discretionary ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.4 Communication Services ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.5 Industrials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 6.7 Real Estate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.2 Utilities ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.2 Energy ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.6 Information Technology ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.5
Largest Holdings [Text Block]		Ten largest holdings Security Percent of Total Investments Footnote Reference Toll Brothers, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.0 % Frontier Communications Parent, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.9 Pinnacle Financial Partners, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.5 Interactive Brokers Group, Inc., Class A ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.4 Stifel Financial Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.2 Axis Capital Holdings Ltd. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.0 Synovus Financial Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.0 JPMorgan Chase & Co. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.0 Louisiana-Pacific Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.9 Builders FirstSource, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.9
C000222498
Shareholder Report [Line Items]
Fund Name		iShares US Small Cap Value Factor ETF
Trading Symbol		SVAL
Security Exchange Name		CboeBZX
Annual or Semi-Annual Statement [Text Block]		This semi-annual shareholder report contains important information about iShares US Small Cap Value Factor 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		1-800-474-2737
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: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>" id="sjs-C409"><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: 12.8px; margin: 0px; overflow: visible; text-align: justify;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; grid-area: auto; line-height: 12.8px; margin: 0px; overflow: visible; text-align: justify;">blackrock.com/fundreports</span></span>
Expenses [Text Block]		What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares US Small Cap Value Factor ETF $10 0.20% Footnote Reference ⁽ᵃ⁾ Annualized.
Expenses Paid, Amount		$ 10
Expense Ratio, Percent		0.20%
Performance Past Does Not Indicate Future [Text]		Past performance is not an indication of future results.
Line Graph [Table Text Block]		Fund performance
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.
AssetsNet	$ 141,634,310	$ 141,634,310
Holdings Count \| Holding	330	330
InvestmentCompanyPortfolioTurnover		8%
Additional Fund Statistics [Text Block]		Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $141,634,310 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 330 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8%
Holdings [Text Block]		Sector allocation Sector Percent of Total Investments Footnote Reference Financials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 46.0 % Industrials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 14.4 Consumer Discretionary ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 13.0 Energy ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 10.7 Materials ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.1 Real Estate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 3.4 Consumer Staples ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 2.4 Information Technology ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.6 Communication Services ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.3 Health Care ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.2 Utilities ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.9
Largest Holdings [Text Block]		Ten largest holdings Security Percent of Total Investments Footnote Reference Eastern Bankshares, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.0 % Provident Financial Services, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.9 M/I Homes, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.8 SkyWest, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.8 Mueller Industries, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.8 Interface, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.7 Heartland Financial USA, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.7 Patrick Industries, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.7 LendingClub Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.7 KB Home ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 0.7

Shareholder Report, Line Graph

Shareholder Report, Line Graph (Details)	6 Months Ended	47 Months Ended	66 Months Ended	78 Months Ended	120 Months Ended
Shareholder Report, Line Graph (Details)	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2024
S&P Total Market Index
Account Value [Line Items]
Line Graph and Table Measure Name					S&P Total Market Index
S&P Total Market Index
Account Value [Line Items]
Line Graph and Table Measure Name					S&P Total Market Index
S&P Total Market Index
Account Value [Line Items]
Line Graph and Table Measure Name					S&P Total Market Index
S&P Total Market Index
Account Value [Line Items]
Line Graph and Table Measure Name					S&P Total Market Index
MSCI USA Index
Account Value [Line Items]
Line Graph and Table Measure Name				MSCI USA Index
S&P Total Market Index
Account Value [Line Items]
Line Graph and Table Measure Name					S&P Total Market Index
S&P Total Market Index
Account Value [Line Items]
Line Graph and Table Measure Name					S&P Total Market Index
S&P Total Market Index
Account Value [Line Items]
Line Graph and Table Measure Name					S&P Total Market Index
S&P Total Market Index
Account Value [Line Items]
Line Graph and Table Measure Name					S&P Total Market Index
S&P Total Market Index
Account Value [Line Items]
Line Graph and Table Measure Name					S&P Total Market Index
S&P Total Market Index
Account Value [Line Items]
Line Graph and Table Measure Name					S&P Total Market Index
S&P Total Market Index
Account Value [Line Items]
Line Graph and Table Measure Name					S&P Total Market Index
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name					®</sup> Index" id="sjs-F41">Russell 3000<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 8px; font-weight: 400; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: left;">®</sup> Index
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name					®</sup> Index" id="sjs-F44">Russell 3000<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 8px; font-weight: 400; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: left;">®</sup> Index
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name					®</sup> Index" id="sjs-F47">Russell 3000<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 8px; font-weight: 400; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: left;">®</sup> Index
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name					®</sup> Index" id="sjs-F50">Russell 3000<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 8px; font-weight: 400; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: left;">®</sup> Index
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name			®</sup> Index" id="sjs-D53">Russell 3000<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 8px; font-weight: 400; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: left;">®</sup> Index
Russell 3000 Index
Account Value [Line Items]
Line Graph and Table Measure Name		®</sup> Index" id="sjs-C56">Russell 3000<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 8px; font-weight: 400; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: left;">®</sup> Index
Dow Jones U.S. Select Aerospace & Defense Index
Account Value [Line Items]
Line Graph and Table Measure Name	Dow Jones U.S. Select Aerospace & Defense Index™
Dow Jones U.S. Select Investment Services Index
Account Value [Line Items]
Line Graph and Table Measure Name	Dow Jones U.S. Select Investment Services Index™
Dow Jones U.S. Select Health Care Providers Index
Account Value [Line Items]
Line Graph and Table Measure Name	Dow Jones U.S. Select Health Care Providers Index™
Dow Jones U.S. Select Home Construction Index
Account Value [Line Items]
Line Graph and Table Measure Name	Dow Jones U.S. Select Home Construction Index™
NYSE FactSet U.S. Infrastructure Index
Account Value [Line Items]
Line Graph and Table Measure Name	NYSE FactSet U.S. Infrastructure Index™
Dow Jones U.S. Select Insurance Index
Account Value [Line Items]
Line Graph and Table Measure Name	Dow Jones U.S. Select Insurance Index™
Dow Jones U.S. Select Medical Equipment Index
Account Value [Line Items]
Line Graph and Table Measure Name	Dow Jones U.S. Select Medical Equipment Index™
Dow Jones U.S. Select Oil Exploration & Production Index
Account Value [Line Items]
Line Graph and Table Measure Name	Dow Jones U.S. Select Oil Exploration & Production Index™
Dow Jones U.S. Select Oil Equipment & Services Index
Account Value [Line Items]
Line Graph and Table Measure Name	Dow Jones U.S. Select Oil Equipment & Services Index™
Dow Jones U.S. Select Pharmaceuticals Index
Account Value [Line Items]
Line Graph and Table Measure Name	Dow Jones U.S. Select Pharmaceuticals Index™
Dow Jones U.S. Real Estate Capped Index
Account Value [Line Items]
Line Graph and Table Measure Name	Dow Jones U.S. Real Estate Capped Index™
Dow Jones U.S. Select Regional Banks Index
Account Value [Line Items]
Line Graph and Table Measure Name	Dow Jones U.S. Select Regional Banks Index™
Russell 1000 Telecommunications RIC 22.5/45 Capped Index
Account Value [Line Items]
Line Graph and Table Measure Name	Russell 1000 Telecommunications RIC 22.5/45 Capped Index
Russell 1000 Index
Account Value [Line Items]
Line Graph and Table Measure Name	®</sup> Index" id="sjs-B98">Russell 1000<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 8px; font-weight: 400; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: left;">®</sup> Index
Russell 1000 Growth
Account Value [Line Items]
Line Graph and Table Measure Name	®</sup> Growth Index" id="sjs-B101">Russell 1000<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 8px; font-weight: 400; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: left;">®</sup> Growth Index
Russell 1000 Value
Account Value [Line Items]
Line Graph and Table Measure Name	®</sup> Value Index" id="sjs-B104">Russell 1000<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 8px; font-weight: 400; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: left;">®</sup> Value Index
Focused Value Select Index
Account Value [Line Items]
Line Graph and Table Measure Name	Focused Value Select Index
Russell 2000 Focused Value Select Index
Account Value [Line Items]
Line Graph and Table Measure Name	Russell 2000 Focused Value Select Index

Shareholder Report, Average Ann

Shareholder Report, Average Annual Return (Details)	6 Months Ended	12 Months Ended	47 Months Ended	60 Months Ended	66 Months Ended	78 Months Ended	120 Months Ended
Shareholder Report, Average Annual Return (Details)	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2024
C000025777
Average Annual Return [Line Items]
Average Annual Return, Percent	13.88%	42.61%		7.06%			11.98%
C000025774
Average Annual Return [Line Items]
Average Annual Return, Percent	11.49%	42.84%		16.93%			14.50%
C000025772
Average Annual Return [Line Items]
Average Annual Return, Percent	4.93%	16.86%		12.85%			11.30%
C000025769
Average Annual Return [Line Items]
Average Annual Return, Percent	9.94%	62.74%		24.79%			19.53%
C000198491
Average Annual Return [Line Items]
Average Annual Return, Percent	9.43%	30.98%		13.47%		12.36%
C000025775
Average Annual Return [Line Items]
Average Annual Return, Percent	10.74%	42.82%		14.60%			12.74%
C000025773
Average Annual Return [Line Items]
Average Annual Return, Percent	1.36%	22.73%		7.96%			14.15%
C000025768
Average Annual Return [Line Items]
Average Annual Return, Percent	(13.40%)	(3.44%)		16.16%			2.89%
C000025770
Average Annual Return [Line Items]
Average Annual Return, Percent	(14.23%)	(15.09%)		4.33%			(9.66%)
C000025771
Average Annual Return [Line Items]
Average Annual Return, Percent	4.94%	21.59%		10.45%			5.76%
C000012058
Average Annual Return [Line Items]
Average Annual Return, Percent	14.89%	33.81%		4.56%			7.36%
C000025776
Average Annual Return [Line Items]
Average Annual Return, Percent	11.62%	46.94%		3.71%			6.42%
C000012063
Average Annual Return [Line Items]
Average Annual Return, Percent	16.26%	21.48%		(0.38%)			0.77%
C000012077
Average Annual Return [Line Items]
Average Annual Return, Percent	9.79%	35.52%		15.49%			12.96%
C000012076
Average Annual Return [Line Items]
Average Annual Return, Percent	11.69%	42%		19.53%			16.32%
C000012075
Average Annual Return [Line Items]
Average Annual Return, Percent	6.96%	27.54%		10.51%			9.05%
C000210345
Average Annual Return [Line Items]
Average Annual Return, Percent	9.15%	38.43%		10.07%	9.15%
C000222498
Average Annual Return [Line Items]
Average Annual Return, Percent	6.55%	25%	16.25%
S&P Total Market Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name							S&P Total Market Index
Average Annual Return, Percent	9.60%	35.24%		15.15%			12.75%
S&P Total Market Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name							S&P Total Market Index
Average Annual Return, Percent	9.60%	35.24%		15.15%			12.75%
S&P Total Market Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name							S&P Total Market Index
Average Annual Return, Percent	9.60%	35.24%		15.15%			12.75%
S&P Total Market Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name							S&P Total Market Index
Average Annual Return, Percent	9.60%	35.24%		15.15%			12.75%
MSCI USA Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name						MSCI USA Index
Average Annual Return, Percent	10.21%	36.22%		15.94%		14.83%
S&P Total Market Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name							S&P Total Market Index
Average Annual Return, Percent	9.60%	35.24%		15.15%			12.75%
S&P Total Market Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name							S&P Total Market Index
Average Annual Return, Percent	9.60%	35.24%		15.15%			12.75%
S&P Total Market Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name							S&P Total Market Index
Average Annual Return, Percent	9.60%	35.24%		15.15%			12.75%
S&P Total Market Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name							S&P Total Market Index
Average Annual Return, Percent	9.60%	35.24%		15.15%			12.75%
S&P Total Market Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name							S&P Total Market Index
Average Annual Return, Percent	9.60%	35.24%		15.15%			12.75%
S&P Total Market Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name							S&P Total Market Index
Average Annual Return, Percent	9.60%	35.24%		15.15%			12.75%
S&P Total Market Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name							S&P Total Market Index
Average Annual Return, Percent	9.60%	35.24%		15.15%			12.75%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name							®</sup> Index" id="sjs-H107">Russell 3000<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 8px; font-weight: 400; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: left;">®</sup> Index
Average Annual Return, Percent	9.65%	35.19%		15.26%			12.83%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name							®</sup> Index" id="sjs-H111">Russell 3000<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 8px; font-weight: 400; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: left;">®</sup> Index
Average Annual Return, Percent	9.65%	35.19%		15.26%			12.83%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name							®</sup> Index" id="sjs-H115">Russell 3000<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 8px; font-weight: 400; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: left;">®</sup> Index
Average Annual Return, Percent	9.65%	35.19%		15.26%			12.83%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name							®</sup> Index" id="sjs-H119">Russell 3000<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 8px; font-weight: 400; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: left;">®</sup> Index
Average Annual Return, Percent	9.65%	35.19%		15.26%			12.83%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name					®</sup> Index" id="sjs-F123">Russell 3000<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 8px; font-weight: 400; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: left;">®</sup> Index
Average Annual Return, Percent	9.65%	35.19%		15.26%	14.78%
Russell 3000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name			®</sup> Index" id="sjs-D127">Russell 3000<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 8px; font-weight: 400; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: left;">®</sup> Index
Average Annual Return, Percent	9.65%	35.19%	15.21%
Dow Jones U.S. Select Aerospace & Defense Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	Dow Jones U.S. Select Aerospace & Defense Index™
Average Annual Return, Percent	14.11%	43.17%		7.48%			12.45%
Dow Jones U.S. Select Investment Services Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	Dow Jones U.S. Select Investment Services Index™
Average Annual Return, Percent	11.73%	43.38%		17.33%			14.93%
Dow Jones U.S. Select Health Care Providers Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	Dow Jones U.S. Select Health Care Providers Index™
Average Annual Return, Percent	5.12%	17.30%		13.26%			11.73%
Dow Jones U.S. Select Home Construction Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	Dow Jones U.S. Select Home Construction Index™
Average Annual Return, Percent	10.18%	63.47%		25.31%			20.04%
NYSE FactSet U.S. Infrastructure Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	NYSE FactSet U.S. Infrastructure Index™
Average Annual Return, Percent	9.61%	31.13%		13.76%		12.70%
Dow Jones U.S. Select Insurance Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	Dow Jones U.S. Select Insurance Index™
Average Annual Return, Percent	11%	43.36%		15.06%			13.19%
Dow Jones U.S. Select Medical Equipment Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	Dow Jones U.S. Select Medical Equipment Index™
Average Annual Return, Percent	1.54%	23.18%		8.36%			14.62%
Dow Jones U.S. Select Oil Exploration & Production Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	Dow Jones U.S. Select Oil Exploration & Production Index™
Average Annual Return, Percent	(13.24%)	(3.08%)		16.62%			3.29%
Dow Jones U.S. Select Oil Equipment & Services Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	Dow Jones U.S. Select Oil Equipment & Services Index™
Average Annual Return, Percent	(14.09%)	(14.79%)		4.77%			(9.39%)
Dow Jones U.S. Select Pharmaceuticals Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	Dow Jones U.S. Select Pharmaceuticals Index™
Average Annual Return, Percent	5.10%	21.90%		10.78%			6.07%
Dow Jones U.S. Real Estate Capped Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	Dow Jones U.S. Real Estate Capped Index™
Average Annual Return, Percent	15.11%	34.26%		4.90%			7.77%
Dow Jones U.S. Select Regional Banks Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	Dow Jones U.S. Select Regional Banks Index™
Average Annual Return, Percent	11.85%	47.56%		4.11%			6.86%
Russell 1000 Telecommunications RIC 22.5/45 Capped Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	Russell 1000 Telecommunications RIC 22.5/45 Capped Index
Average Annual Return, Percent	16.49%	21.83%		(0.07%)			0.98%
Russell 1000 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	®</sup> Index" id="sjs-B183">Russell 1000<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 8px; font-weight: 400; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: left;">®</sup> Index
Average Annual Return, Percent	9.87%	35.68%		15.64%			13.10%
Russell 1000 Growth
Average Annual Return [Line Items]
Line Graph and Table Measure Name	®</sup> Growth Index" id="sjs-B187">Russell 1000<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 8px; font-weight: 400; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: left;">®</sup> Growth Index
Average Annual Return, Percent	11.79%	42.19%		19.74%			16.52%
Russell 1000 Value
Average Annual Return [Line Items]
Line Graph and Table Measure Name	®</sup> Value Index" id="sjs-B191">Russell 1000<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 8px; font-weight: 400; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: left;">®</sup> Value Index
Average Annual Return, Percent	7.06%	27.76%		10.69%			9.23%
Focused Value Select Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	Focused Value Select Index
Average Annual Return, Percent	9.33%	38.90%		10.37%	9.48%
Russell 2000 Focused Value Select Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	Russell 2000 Focused Value Select Index
Average Annual Return, Percent	6.78%	25.49%	16.65%

Shareholder Report, Holdings (D

Shareholder Report, Holdings (Details)	Sep. 30, 2024
C000025777 \| General Electric Co
Holdings [Line Items]
Percent of Total Investments	19.30%
C000025777 \| RTX Corp.
Holdings [Line Items]
Percent of Total Investments	15.20%
C000025777 \| Lockheed Martin Corp.
Holdings [Line Items]
Percent of Total Investments	10.90%
C000025777 \| Axon Enterprise, Inc.
Holdings [Line Items]
Percent of Total Investments	4.70%
C000025777 \| TransDigm Group, Inc.
Holdings [Line Items]
Percent of Total Investments	4.60%
C000025777 \| Howmet Aerospace, Inc.
Holdings [Line Items]
Percent of Total Investments	4.50%
C000025777 \| L3Harris Technologies, Inc.
Holdings [Line Items]
Percent of Total Investments	4.50%
C000025777 \| Northrop Grumman Corp.
Holdings [Line Items]
Percent of Total Investments	4.40%
C000025777 \| General Dynamics Corp.
Holdings [Line Items]
Percent of Total Investments	4.30%
C000025777 \| Boeing Co. (The)
Holdings [Line Items]
Percent of Total Investments	4%
C000025777 \| Aerospace & Defense
Holdings [Line Items]
Percent of Total Investments	99.80%
C000025777 \| Leisure Products
Holdings [Line Items]
Percent of Total Investments	0.20%
C000025774 \| S&P Global, Inc.
Holdings [Line Items]
Percent of Total Investments	14.70%
C000025774 \| Goldman Sachs Group, Inc. (The)
Holdings [Line Items]
Percent of Total Investments	13.90%
C000025774 \| Morgan Stanley
Holdings [Line Items]
Percent of Total Investments	11.50%
C000025774 \| Coinbase Global, Inc.Class A
Holdings [Line Items]
Percent of Total Investments	4.90%
C000025774 \| Charles Schwab Corp. (The)
Holdings [Line Items]
Percent of Total Investments	4.50%
C000025774 \| MSCI, Inc.Class A
Holdings [Line Items]
Percent of Total Investments	4.50%
C000025774 \| CME Group, Inc.Class A
Holdings [Line Items]
Percent of Total Investments	4.30%
C000025774 \| Intercontinental Exchange, Inc.
Holdings [Line Items]
Percent of Total Investments	4.30%
C000025774 \| Moody's Corp.
Holdings [Line Items]
Percent of Total Investments	4.30%
C000025774 \| Nasdaq, Inc.
Holdings [Line Items]
Percent of Total Investments	4.20%
C000025774 \| Financial Exchanges & Data
Holdings [Line Items]
Percent of Total Investments	51.40%
C000025774 \| Investment Banking & Brokerage
Holdings [Line Items]
Percent of Total Investments	48.60%
C000025772 \| UnitedHealth Group, Inc.
Holdings [Line Items]
Percent of Total Investments	22.30%
C000025772 \| Elevance Health, Inc.
Holdings [Line Items]
Percent of Total Investments	13.60%
C000025772 \| Cigna Group (The)
Holdings [Line Items]
Percent of Total Investments	8%
C000025772 \| CVS Health Corp.
Holdings [Line Items]
Percent of Total Investments	5%
C000025772 \| HCA Healthcare, Inc.
Holdings [Line Items]
Percent of Total Investments	4.70%
C000025772 \| Centene Corp.
Holdings [Line Items]
Percent of Total Investments	4.60%
C000025772 \| Humana, Inc.
Holdings [Line Items]
Percent of Total Investments	4.30%
C000025772 \| Veeva Systems, Inc.Class A
Holdings [Line Items]
Percent of Total Investments	4.20%
C000025772 \| Molina Healthcare, Inc.
Holdings [Line Items]
Percent of Total Investments	3.20%
C000025772 \| Labcorp Holdings, Inc.
Holdings [Line Items]
Percent of Total Investments	2.90%
C000025772 \| Managed Health Care
Holdings [Line Items]
Percent of Total Investments	49.70%
C000025772 \| Health Care Services
Holdings [Line Items]
Percent of Total Investments	28.40%
C000025772 \| Health Care Facilities
Holdings [Line Items]
Percent of Total Investments	15.10%
C000025772 \| Health Care Technology
Holdings [Line Items]
Percent of Total Investments	6.80%
C000025769 \| DR Horton, Inc.
Holdings [Line Items]
Percent of Total Investments	14.70%
C000025769 \| Lennar Corp.Class A
Holdings [Line Items]
Percent of Total Investments	11.90%
C000025769 \| NVR, Inc.
Holdings [Line Items]
Percent of Total Investments	7.90%
C000025769 \| PulteGroup, Inc.
Holdings [Line Items]
Percent of Total Investments	7.80%
C000025769 \| Lowe's Companies, Inc.
Holdings [Line Items]
Percent of Total Investments	4.60%
C000025769 \| Home Depot, Inc. (The)
Holdings [Line Items]
Percent of Total Investments	4.60%
C000025769 \| Sherwin-Williams Co. (The)
Holdings [Line Items]
Percent of Total Investments	4.30%
C000025769 \| Toll Brothers, Inc.
Holdings [Line Items]
Percent of Total Investments	4.20%
C000025769 \| TopBuild Corp.
Holdings [Line Items]
Percent of Total Investments	3.20%
C000025769 \| Builders FirstSource, Inc.
Holdings [Line Items]
Percent of Total Investments	3%
C000025769 \| Homebuilding
Holdings [Line Items]
Percent of Total Investments	64.50%
C000025769 \| Building Products
Holdings [Line Items]
Percent of Total Investments	16.70%
C000025769 \| Home Improvement Retail
Holdings [Line Items]
Percent of Total Investments	10.90%
C000025769 \| Specialty Chemicals
Holdings [Line Items]
Percent of Total Investments	4.30%
C000025769 \| Home Furnishings
Holdings [Line Items]
Percent of Total Investments	1.50%
C000025769 \| Construction Materials
Holdings [Line Items]
Percent of Total Investments	1.30%
C000025769 \| Trading Companies & Distributors
Holdings [Line Items]
Percent of Total Investments	0.70%
C000025769 \| Homefurnishing Retail
Holdings [Line Items]
Percent of Total Investments	0.10%
C000198491 \| Vistra Corp.
Holdings [Line Items]
Percent of Total Investments	1.10%
C000198491 \| Constellation Energy Corp.
Holdings [Line Items]
Percent of Total Investments	1%
C000198491 \| NRG Energy, Inc.
Holdings [Line Items]
Percent of Total Investments	0.80%
C000198491 \| Public Service Enterprise Group, Inc.
Holdings [Line Items]
Percent of Total Investments	0.80%
C000198491 \| ONE Gas, Inc.
Holdings [Line Items]
Percent of Total Investments	0.70%
C000198491 \| Compass Minerals International, Inc.
Holdings [Line Items]
Percent of Total Investments	0.70%
C000198491 \| Entergy Corp.
Holdings [Line Items]
Percent of Total Investments	0.70%
C000198491 \| CenterPoint Energy, Inc.
Holdings [Line Items]
Percent of Total Investments	0.70%
C000198491 \| TXNM Energy, Inc.
Holdings [Line Items]
Percent of Total Investments	0.70%
C000198491 \| Exelon Corp.
Holdings [Line Items]
Percent of Total Investments	0.70%
C000198491 \| Diversified Metals & Mining
Holdings [Line Items]
Percent of Total Investments	20.20%
C000198491 \| Building Products
Holdings [Line Items]
Percent of Total Investments	6.30%
C000198491 \| Construction Materials
Holdings [Line Items]
Percent of Total Investments	3.60%
C000198491 \| Electric Utilities
Holdings [Line Items]
Percent of Total Investments	18.60%
C000198491 \| Construction & Engineering
Holdings [Line Items]
Percent of Total Investments	13.20%
C000198491 \| Multi-Utilities
Holdings [Line Items]
Percent of Total Investments	10.70%
C000198491 \| Steel
Holdings [Line Items]
Percent of Total Investments	7.10%
C000198491 \| Oil & Gas Storage & Transportation
Holdings [Line Items]
Percent of Total Investments	6.90%
C000198491 \| Water Utilities
Holdings [Line Items]
Percent of Total Investments	5.50%
C000198491 \| Gas Utilities
Holdings [Line Items]
Percent of Total Investments	4.10%
C000198491 \| Commodity Chemicals
Holdings [Line Items]
Percent of Total Investments	3.80%
C000025775 \| Progressive Corp. (The)
Holdings [Line Items]
Percent of Total Investments	16.50%
C000025775 \| Chubb Ltd.
Holdings [Line Items]
Percent of Total Investments	12.10%
C000025775 \| Aflac, Inc.
Holdings [Line Items]
Percent of Total Investments	6.30%
C000025775 \| Travelers Companies, Inc. (The)
Holdings [Line Items]
Percent of Total Investments	5.90%
C000025775 \| MetLife, Inc.
Holdings [Line Items]
Percent of Total Investments	4.80%
C000025775 \| Prudential Financial, Inc.
Holdings [Line Items]
Percent of Total Investments	4.60%
C000025775 \| Allstate Corp. (The)
Holdings [Line Items]
Percent of Total Investments	4.50%
C000025775 \| Arch Capital Group Ltd.
Holdings [Line Items]
Percent of Total Investments	4.40%
C000025775 \| American International Group, Inc.
Holdings [Line Items]
Percent of Total Investments	4.40%
C000025775 \| Hartford Financial Services Group, Inc. (The)
Holdings [Line Items]
Percent of Total Investments	4.20%
C000025775 \| Property & Casualty Insurance
Holdings [Line Items]
Percent of Total Investments	71.90%
C000025775 \| Life & Health Insurance
Holdings [Line Items]
Percent of Total Investments	23.50%
C000025775 \| Multi-line Insurance
Holdings [Line Items]
Percent of Total Investments	4.60%
C000251033 \| Eaton Corp. PLC
Holdings [Line Items]
Percent of Total Investments	4.20%
C000251033 \| Deere & Co.
Holdings [Line Items]
Percent of Total Investments	4.10%
C000251033 \| Amphenol Corp.Class A
Holdings [Line Items]
Percent of Total Investments	4%
C000251033 \| PACCAR, Inc.
Holdings [Line Items]
Percent of Total Investments	4%
C000251033 \| Honeywell International, Inc.
Holdings [Line Items]
Percent of Total Investments	3.80%
C000251033 \| General Motors Co.
Holdings [Line Items]
Percent of Total Investments	3.80%
C000251033 \| Cummins, Inc.
Holdings [Line Items]
Percent of Total Investments	3.80%
C000251033 \| Ford Motor Co.
Holdings [Line Items]
Percent of Total Investments	3.50%
C000251033 \| AMETEK, Inc.
Holdings [Line Items]
Percent of Total Investments	3.40%
C000251033 \| Trane Technologies PLC
Holdings [Line Items]
Percent of Total Investments	3.20%
C000251033 \| Semiconductors
Holdings [Line Items]
Percent of Total Investments	7.90%
C000251033 \| Aerospace & Defense
Holdings [Line Items]
Percent of Total Investments	13.90%
C000251033 \| Building Products
Holdings [Line Items]
Percent of Total Investments	9.30%
C000251033 \| Electrical Components & Equipment
Holdings [Line Items]
Percent of Total Investments	16.60%
C000251033 \| Industrial Machinery & Supplies & Components
Holdings [Line Items]
Percent of Total Investments	15.70%
C000251033 \| Construction Machinery & Heavy Transportation Equipment
Holdings [Line Items]
Percent of Total Investments	9.70%
C000251033 \| Automobile Manufacturers
Holdings [Line Items]
Percent of Total Investments	8.80%
C000251033 \| Electronic Components
Holdings [Line Items]
Percent of Total Investments	6.10%
C000251033 \| Agricultural & Farm Machinery
Holdings [Line Items]
Percent of Total Investments	4.80%
C000251033 \| Industrial Conglomerates
Holdings [Line Items]
Percent of Total Investments	3.80%
C000251033 \| Electronic Equipment & Instruments
Holdings [Line Items]
Percent of Total Investments	3.40%
C000025773 \| Abbott Laboratories
Holdings [Line Items]
Percent of Total Investments	16.60%
C000025773 \| Intuitive Surgical, Inc.
Holdings [Line Items]
Percent of Total Investments	14.60%
C000025773 \| Stryker Corp.
Holdings [Line Items]
Percent of Total Investments	10.40%
C000025773 \| GE HealthCare Technologies, Inc.
Holdings [Line Items]
Percent of Total Investments	5.10%
C000025773 \| Becton Dickinson & Co.
Holdings [Line Items]
Percent of Total Investments	4.60%
C000025773 \| IDEXX Laboratories, Inc.
Holdings [Line Items]
Percent of Total Investments	4.60%
C000025773 \| Boston Scientific Corp.
Holdings [Line Items]
Percent of Total Investments	4.50%
C000025773 \| Medtronic PLC
Holdings [Line Items]
Percent of Total Investments	4.50%
C000025773 \| Edwards Lifesciences Corp.
Holdings [Line Items]
Percent of Total Investments	4.30%
C000025773 \| ResMed, Inc.
Holdings [Line Items]
Percent of Total Investments	4.20%
C000025773 \| Health Care Equipment
Holdings [Line Items]
Percent of Total Investments	100%
C000025768 \| ConocoPhillips
Holdings [Line Items]
Percent of Total Investments	18.80%
C000025768 \| EOG Resources, Inc.
Holdings [Line Items]
Percent of Total Investments	10.80%
C000025768 \| Marathon Petroleum Corp.
Holdings [Line Items]
Percent of Total Investments	8.40%
C000025768 \| Phillips 66
Holdings [Line Items]
Percent of Total Investments	6.60%
C000025768 \| Diamondback Energy, Inc.
Holdings [Line Items]
Percent of Total Investments	4.60%
C000025768 \| Hess Corp.
Holdings [Line Items]
Percent of Total Investments	4.60%
C000025768 \| Valero Energy Corp.
Holdings [Line Items]
Percent of Total Investments	4.40%
C000025768 \| Devon Energy Corp.
Holdings [Line Items]
Percent of Total Investments	4.20%
C000025768 \| EQT Corp.
Holdings [Line Items]
Percent of Total Investments	3.90%
C000025768 \| Coterra Energy, Inc.
Holdings [Line Items]
Percent of Total Investments	3.20%
C000025768 \| Oil & Gas Exploration & Production
Holdings [Line Items]
Percent of Total Investments	77.50%
C000025768 \| Oil & Gas Refining & Marketing
Holdings [Line Items]
Percent of Total Investments	22.50%
C000025770 \| Schlumberger N.V.
Holdings [Line Items]
Percent of Total Investments	22.50%
C000025770 \| Baker Hughes Co.Class A
Holdings [Line Items]
Percent of Total Investments	20.40%
C000025770 \| TechnipFMC PLC
Holdings [Line Items]
Percent of Total Investments	4.70%
C000025770 \| ChampionX Corp.
Holdings [Line Items]
Percent of Total Investments	4.50%
C000025770 \| Halliburton Co.
Holdings [Line Items]
Percent of Total Investments	4.40%
C000025770 \| NOV, Inc.
Holdings [Line Items]
Percent of Total Investments	4.30%
C000025770 \| Weatherford International PLC
Holdings [Line Items]
Percent of Total Investments	4%
C000025770 \| Noble Corp. PLCClass A
Holdings [Line Items]
Percent of Total Investments	3.80%
C000025770 \| Cactus, Inc.Class A
Holdings [Line Items]
Percent of Total Investments	3.10%
C000025770 \| Valaris, Ltd.
Holdings [Line Items]
Percent of Total Investments	2.90%
C000025770 \| Oil & Gas Equipment & Services
Holdings [Line Items]
Percent of Total Investments	85.80%
C000025770 \| Oil & Gas Drilling
Holdings [Line Items]
Percent of Total Investments	14.20%
C000025771 \| Johnson & Johnson
Holdings [Line Items]
Percent of Total Investments	22.10%
C000025771 \| Eli Lilly & Co.
Holdings [Line Items]
Percent of Total Investments	21.60%
C000025771 \| Bristol-Myers Squibb Co.
Holdings [Line Items]
Percent of Total Investments	4.80%
C000025771 \| Zoetis, Inc.Class A
Holdings [Line Items]
Percent of Total Investments	4.60%
C000025771 \| Viatris, Inc.
Holdings [Line Items]
Percent of Total Investments	4.60%
C000025771 \| Merck & Co., Inc.
Holdings [Line Items]
Percent of Total Investments	4.50%
C000025771 \| Pfizer, Inc.
Holdings [Line Items]
Percent of Total Investments	4.40%
C000025771 \| Royalty Pharma PLCClass A
Holdings [Line Items]
Percent of Total Investments	4.30%
C000025771 \| Catalent, Inc.
Holdings [Line Items]
Percent of Total Investments	4.30%
C000025771 \| Elanco Animal Health, Inc.
Holdings [Line Items]
Percent of Total Investments	2.80%
C000025771 \| Pharmaceuticals
Holdings [Line Items]
Percent of Total Investments	100%
C000012058 \| Prologis, Inc.
Holdings [Line Items]
Percent of Total Investments	8.30%
C000012058 \| American Tower Corp.
Holdings [Line Items]
Percent of Total Investments	7.70%
C000012058 \| Equinix, Inc.
Holdings [Line Items]
Percent of Total Investments	6%
C000012058 \| Welltower, Inc.
Holdings [Line Items]
Percent of Total Investments	4.50%
C000012058 \| Public Storage
Holdings [Line Items]
Percent of Total Investments	4.10%
C000012058 \| Realty Income Corp.
Holdings [Line Items]
Percent of Total Investments	4%
C000012058 \| Simon Property Group, Inc.
Holdings [Line Items]
Percent of Total Investments	3.70%
C000012058 \| Crown Castle, Inc.
Holdings [Line Items]
Percent of Total Investments	3.70%
C000012058 \| Digital Realty Trust, Inc.
Holdings [Line Items]
Percent of Total Investments	3.60%
C000012058 \| Extra Space Storage, Inc.
Holdings [Line Items]
Percent of Total Investments	2.70%
C000012058 \| Office REITs
Holdings [Line Items]
Percent of Total Investments	8.50%
C000012058 \| Telecom Tower REITs
Holdings [Line Items]
Percent of Total Investments	13.30%
C000012058 \| Retail REITs
Holdings [Line Items]
Percent of Total Investments	12.10%
C000012058 \| Industrial REITs
Holdings [Line Items]
Percent of Total Investments	11.60%
C000012058 \| Health Care REITs
Holdings [Line Items]
Percent of Total Investments	10.40%
C000012058 \| Data Center REITs
Holdings [Line Items]
Percent of Total Investments	9.60%
C000012058 \| Multi-Family Residential REITs
Holdings [Line Items]
Percent of Total Investments	8.70%
C000012058 \| Self-Storage REITs
Holdings [Line Items]
Percent of Total Investments	7.70%
C000012058 \| Other Specialized REITs
Holdings [Line Items]
Percent of Total Investments	6.90%
C000012058 \| Real Estate Services
Holdings [Line Items]
Percent of Total Investments	6.80%
C000012058 \| Single-Family Residential REITs
Holdings [Line Items]
Percent of Total Investments	4.40%
C000025776 \| PNC Financial Services Group, Inc. (The)
Holdings [Line Items]
Percent of Total Investments	14.40%
C000025776 \| U.S. Bancorp
Holdings [Line Items]
Percent of Total Investments	14%
C000025776 \| Truist Financial Corp.
Holdings [Line Items]
Percent of Total Investments	11.20%
C000025776 \| Fifth Third Bancorp
Holdings [Line Items]
Percent of Total Investments	5%
C000025776 \| M&T Bank Corp.
Holdings [Line Items]
Percent of Total Investments	4.60%
C000025776 \| First Citizens BancShares, Inc.Class A
Holdings [Line Items]
Percent of Total Investments	4.40%
C000025776 \| Huntington Bancshares, Inc.
Holdings [Line Items]
Percent of Total Investments	4.40%
C000025776 \| Regions Financial Corp.
Holdings [Line Items]
Percent of Total Investments	4.40%
C000025776 \| Citizens Financial Group, Inc.
Holdings [Line Items]
Percent of Total Investments	3.80%
C000025776 \| KeyCorp
Holdings [Line Items]
Percent of Total Investments	3.20%
C000025776 \| Regional Banks
Holdings [Line Items]
Percent of Total Investments	57.40%
C000025776 \| Diversified Banks
Holdings [Line Items]
Percent of Total Investments	42.60%
C000012063 \| Cisco Systems, Inc.
Holdings [Line Items]
Percent of Total Investments	16.80%
C000012063 \| Verizon Communications, Inc.
Holdings [Line Items]
Percent of Total Investments	14.80%
C000012063 \| AT&T, Inc.
Holdings [Line Items]
Percent of Total Investments	12.50%
C000012063 \| Comcast Corp.Class A
Holdings [Line Items]
Percent of Total Investments	4.50%
C000012063 \| Arista Networks, Inc.
Holdings [Line Items]
Percent of Total Investments	4.40%
C000012063 \| Lumentum Holdings, Inc.
Holdings [Line Items]
Percent of Total Investments	4.10%
C000012063 \| T-Mobile U.S., Inc.
Holdings [Line Items]
Percent of Total Investments	4.10%
C000012063 \| Ciena Corp.
Holdings [Line Items]
Percent of Total Investments	4.10%
C000012063 \| Liberty Broadband Corp.Class CNVS
Holdings [Line Items]
Percent of Total Investments	4%
C000012063 \| Motorola Solutions, Inc.
Holdings [Line Items]
Percent of Total Investments	4%
C000012063 \| Communications Equipment
Holdings [Line Items]
Percent of Total Investments	40.90%
C000012063 \| Integrated Telecommunication Services
Holdings [Line Items]
Percent of Total Investments	30.70%
C000012063 \| Cable & Satellite
Holdings [Line Items]
Percent of Total Investments	12.70%
C000012063 \| Alternative Carriers
Holdings [Line Items]
Percent of Total Investments	7.80%
C000012063 \| Wireless Telecommunication Services
Holdings [Line Items]
Percent of Total Investments	4.10%
C000012063 \| Movies & Entertainment
Holdings [Line Items]
Percent of Total Investments	3.80%
C000012077 \| Apple, Inc.
Holdings [Line Items]
Percent of Total Investments	6.40%
C000012077 \| Microsoft Corp.
Holdings [Line Items]
Percent of Total Investments	6.10%
C000012077 \| NVIDIA Corp.
Holdings [Line Items]
Percent of Total Investments	5.40%
C000012077 \| Amazon.com, Inc.
Holdings [Line Items]
Percent of Total Investments	3.30%
C000012077 \| Meta Platforms, Inc.Class A
Holdings [Line Items]
Percent of Total Investments	2.40%
C000012077 \| Alphabet, Inc.Class A
Holdings [Line Items]
Percent of Total Investments	1.80%
C000012077 \| Berkshire Hathaway, Inc.Class B
Holdings [Line Items]
Percent of Total Investments	1.60%
C000012077 \| Alphabet, Inc.Class CNVS
Holdings [Line Items]
Percent of Total Investments	1.60%
C000012077 \| Broadcom, Inc.
Holdings [Line Items]
Percent of Total Investments	1.50%
C000012077 \| Tesla, Inc.
Holdings [Line Items]
Percent of Total Investments	1.40%
C000012077 \| Information Technology
Holdings [Line Items]
Percent of Total Investments	29.80%
C000012077 \| Financials
Holdings [Line Items]
Percent of Total Investments	13.40%
C000012077 \| Health Care
Holdings [Line Items]
Percent of Total Investments	11.50%
C000012077 \| Consumer Discretionary
Holdings [Line Items]
Percent of Total Investments	10.40%
C000012077 \| Industrials
Holdings [Line Items]
Percent of Total Investments	9.40%
C000012077 \| Communication Services
Holdings [Line Items]
Percent of Total Investments	8.70%
C000012077 \| Consumer Staples
Holdings [Line Items]
Percent of Total Investments	5.70%
C000012077 \| Energy
Holdings [Line Items]
Percent of Total Investments	3.40%
C000012077 \| Real Estate
Holdings [Line Items]
Percent of Total Investments	2.70%
C000012077 \| Materials
Holdings [Line Items]
Percent of Total Investments	2.60%
C000012077 \| Utilities
Holdings [Line Items]
Percent of Total Investments	2.40%
C000012076 \| Eli Lilly & Co.
Holdings [Line Items]
Percent of Total Investments	2.60%
C000012076 \| Apple, Inc.
Holdings [Line Items]
Percent of Total Investments	12.30%
C000012076 \| Microsoft Corp.
Holdings [Line Items]
Percent of Total Investments	11.60%
C000012076 \| NVIDIA Corp.
Holdings [Line Items]
Percent of Total Investments	10.30%
C000012076 \| Amazon.com, Inc.
Holdings [Line Items]
Percent of Total Investments	6.30%
C000012076 \| Meta Platforms, Inc.Class A
Holdings [Line Items]
Percent of Total Investments	4.60%
C000012076 \| Alphabet, Inc.Class A
Holdings [Line Items]
Percent of Total Investments	3.50%
C000012076 \| Alphabet, Inc.Class CNVS
Holdings [Line Items]
Percent of Total Investments	3%
C000012076 \| Broadcom, Inc.
Holdings [Line Items]
Percent of Total Investments	2.80%
C000012076 \| Tesla, Inc.
Holdings [Line Items]
Percent of Total Investments	2.60%
C000012076 \| Information Technology
Holdings [Line Items]
Percent of Total Investments	48.80%
C000012076 \| Financials
Holdings [Line Items]
Percent of Total Investments	6.30%
C000012076 \| Health Care
Holdings [Line Items]
Percent of Total Investments	7.80%
C000012076 \| Consumer Discretionary
Holdings [Line Items]
Percent of Total Investments	14.20%
C000012076 \| Industrials
Holdings [Line Items]
Percent of Total Investments	4.60%
C000012076 \| Communication Services
Holdings [Line Items]
Percent of Total Investments	12.80%
C000012076 \| Consumer Staples
Holdings [Line Items]
Percent of Total Investments	3.60%
C000012076 \| Energy
Holdings [Line Items]
Percent of Total Investments	0.40%
C000012076 \| Real Estate
Holdings [Line Items]
Percent of Total Investments	0.60%
C000012076 \| Materials
Holdings [Line Items]
Percent of Total Investments	0.70%
C000012076 \| Utilities
Holdings [Line Items]
Percent of Total Investments	0.20%
C000012075 \| UnitedHealth Group, Inc.
Holdings [Line Items]
Percent of Total Investments	2%
C000012075 \| Johnson & Johnson
Holdings [Line Items]
Percent of Total Investments	1.50%
C000012075 \| Berkshire Hathaway, Inc.Class B
Holdings [Line Items]
Percent of Total Investments	3.30%
C000012075 \| JPMorgan Chase & Co.
Holdings [Line Items]
Percent of Total Investments	2.40%
C000012075 \| Exxon Mobil Corp.
Holdings [Line Items]
Percent of Total Investments	2.10%
C000012075 \| Walmart, Inc.
Holdings [Line Items]
Percent of Total Investments	1.40%
C000012075 \| Procter & Gamble Co. (The)
Holdings [Line Items]
Percent of Total Investments	1.30%
C000012075 \| Bank of America Corp.
Holdings [Line Items]
Percent of Total Investments	1.10%
C000012075 \| Chevron Corp.
Holdings [Line Items]
Percent of Total Investments	1%
C000012075 \| Thermo Fisher Scientific, Inc.
Holdings [Line Items]
Percent of Total Investments	0.90%
C000012075 \| Information Technology
Holdings [Line Items]
Percent of Total Investments	9.10%
C000012075 \| Financials
Holdings [Line Items]
Percent of Total Investments	21.20%
C000012075 \| Health Care
Holdings [Line Items]
Percent of Total Investments	15.50%
C000012075 \| Consumer Discretionary
Holdings [Line Items]
Percent of Total Investments	6.30%
C000012075 \| Industrials
Holdings [Line Items]
Percent of Total Investments	14.70%
C000012075 \| Communication Services
Holdings [Line Items]
Percent of Total Investments	4.20%
C000012075 \| Consumer Staples
Holdings [Line Items]
Percent of Total Investments	8%
C000012075 \| Energy
Holdings [Line Items]
Percent of Total Investments	6.70%
C000012075 \| Real Estate
Holdings [Line Items]
Percent of Total Investments	4.90%
C000012075 \| Materials
Holdings [Line Items]
Percent of Total Investments	4.60%
C000012075 \| Utilities
Holdings [Line Items]
Percent of Total Investments	4.80%
C000210345 \| Toll Brothers, Inc.
Holdings [Line Items]
Percent of Total Investments	4%
C000210345 \| Builders FirstSource, Inc.
Holdings [Line Items]
Percent of Total Investments	2.90%
C000210345 \| JPMorgan Chase & Co.
Holdings [Line Items]
Percent of Total Investments	3%
C000210345 \| Frontier Communications Parent, Inc.
Holdings [Line Items]
Percent of Total Investments	3.90%
C000210345 \| Pinnacle Financial Partners, Inc.
Holdings [Line Items]
Percent of Total Investments	3.50%
C000210345 \| Interactive Brokers Group, Inc.Class A
Holdings [Line Items]
Percent of Total Investments	3.40%
C000210345 \| Stifel Financial Corp.
Holdings [Line Items]
Percent of Total Investments	3.20%
C000210345 \| Axis Capital Holdings Ltd.
Holdings [Line Items]
Percent of Total Investments	3%
C000210345 \| Synovus Financial Corp.
Holdings [Line Items]
Percent of Total Investments	3%
C000210345 \| Louisiana-Pacific Corp.
Holdings [Line Items]
Percent of Total Investments	2.90%
C000210345 \| Information Technology
Holdings [Line Items]
Percent of Total Investments	2.50%
C000210345 \| Financials
Holdings [Line Items]
Percent of Total Investments	51.90%
C000210345 \| Consumer Discretionary
Holdings [Line Items]
Percent of Total Investments	8.40%
C000210345 \| Industrials
Holdings [Line Items]
Percent of Total Investments	6.70%
C000210345 \| Communication Services
Holdings [Line Items]
Percent of Total Investments	7.50%
C000210345 \| Energy
Holdings [Line Items]
Percent of Total Investments	2.60%
C000210345 \| Real Estate
Holdings [Line Items]
Percent of Total Investments	5.20%
C000210345 \| Materials
Holdings [Line Items]
Percent of Total Investments	11%
C000210345 \| Utilities
Holdings [Line Items]
Percent of Total Investments	4.20%
C000222498 \| Eastern Bankshares, Inc.
Holdings [Line Items]
Percent of Total Investments	1%
C000222498 \| Provident Financial Services, Inc.
Holdings [Line Items]
Percent of Total Investments	0.90%
C000222498 \| M/I Homes, Inc.
Holdings [Line Items]
Percent of Total Investments	0.80%
C000222498 \| SkyWest, Inc.
Holdings [Line Items]
Percent of Total Investments	0.80%
C000222498 \| Mueller Industries, Inc.
Holdings [Line Items]
Percent of Total Investments	0.80%
C000222498 \| Interface, Inc.
Holdings [Line Items]
Percent of Total Investments	0.70%
C000222498 \| Heartland Financial USA, Inc.
Holdings [Line Items]
Percent of Total Investments	0.70%
C000222498 \| Patrick Industries, Inc.
Holdings [Line Items]
Percent of Total Investments	0.70%
C000222498 \| LendingClub Corp.
Holdings [Line Items]
Percent of Total Investments	0.70%
C000222498 \| KB Home
Holdings [Line Items]
Percent of Total Investments	0.70%
C000222498 \| Information Technology
Holdings [Line Items]
Percent of Total Investments	1.60%
C000222498 \| Financials
Holdings [Line Items]
Percent of Total Investments	46%
C000222498 \| Health Care
Holdings [Line Items]
Percent of Total Investments	1.20%
C000222498 \| Consumer Discretionary
Holdings [Line Items]
Percent of Total Investments	13%
C000222498 \| Industrials
Holdings [Line Items]
Percent of Total Investments	14.40%
C000222498 \| Communication Services
Holdings [Line Items]
Percent of Total Investments	1.30%
C000222498 \| Consumer Staples
Holdings [Line Items]
Percent of Total Investments	2.40%
C000222498 \| Energy
Holdings [Line Items]
Percent of Total Investments	10.70%
C000222498 \| Real Estate
Holdings [Line Items]
Percent of Total Investments	3.40%
C000222498 \| Materials
Holdings [Line Items]
Percent of Total Investments	5.10%
C000222498 \| Utilities
Holdings [Line Items]
Percent of Total Investments	0.90%