S000004350 [Member] Average Annual Total Returns

12 Months Ended

60 Months Ended

120 Months Ended

299 Months Ended

Dec. 31, 2025

Dec. 31, 2025

Dec. 31, 2025

Dec. 31, 2025

MSCI USA Index (Returns do not reflect deductions for fees, expenses or taxes)

Prospectus [Line Items]

Average Annual Return, Percent

17.75%

13.87%

14.79%

NYSE Biotechnology Index (Spliced) (Returns do not reflect deductions for fees, expenses or taxes)

Prospectus [Line Items]

Average Annual Return, Percent

^[1]

28.46%

2.83%

4.72%

iShares Biotechnology ETF

Prospectus [Line Items]

Average Annual Return, Percent

28.03%

2.47%

4.37%

Performance Inception Date

Feb. 05, 2001

iShares Biotechnology ETF | After Taxes on Distributions

Prospectus [Line Items]

Average Annual Return, Percent

27.95%

2.41%

4.31%

iShares Biotechnology ETF | After Taxes on Distributions and Sales

Prospectus [Line Items]

Average Annual Return, Percent

16.64%

1.89%

3.46%

[1]	The NYSE Biotechnology Index (Spliced) reflects the performance of the Nasdaq Biotechnology Index through June 20, 2021 and then NYSE Biotechnology Index thereafter, which reflect the times when each index was the Underlying Index of the Fund.