S000004350 [Member] Annual Total Returns |
12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| iShares Biotechnology ETF | iShares Biotechnology ETF | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 28.03% | (2.40%) | 3.62% | (13.59%) | 0.99% | 25.90% | 24.75% | (9.14%) | 21.20% | (21.53%) |