S000004310 [Member] Investment Risks - iShares Core S&P 500 ETF	Mar. 31, 2026
Risk Lose Money [Member]
Prospectus [Line Items]
Risk [Text Block]	As with any investment, you could lose all or part of your investment in the Fund, and the Fund's performance could trail that of other investments.
Risk Nondiversified Status [Member]
Prospectus [Line Items]
Risk [Text Block]	Non-Diversification Risk. To the extent the Fund is non-diversified, the Fund may invest a large percentage of its assets in securities or other instruments representing a small number of issuers or counterparties and thus may be more susceptible to the risks associated with these particular issuers or counterparties. As a result, the Fund's performance may depend to a greater extent on the performance of a small number of issuers or counterparties, which may lead to more volatility in the Fund’s NAV.

S000004310 [Member] Investment Risks - iShares Core S&P 500 ETF

Mar. 31, 2026

As with any investment, you could lose all or part of your investment in the Fund, and the Fund's performance could trail that of other investments.

Prospectus [Line Items]

Risk [Text Block]

Non-Diversification Risk. To the extent the Fund is non-diversified, the Fund may invest a large percentage of its assets in securities or other instruments representing a small number of issuers or counterparties and thus may be more susceptible to the risks associated with these particular issuers or counterparties. As a result, the Fund's performance may depend to a greater extent on the performance of a small number of issuers or counterparties, which may lead to more volatility in the Fund’s NAV.