v3.26.1
S000080645 [Member] Average Annual Total Returns
 12 Months Ended 18 Months Ended
Dec. 31, 2024
Dec. 31, 2024
S&P 500 Index (Index returns do not reflect deductions for fees, expenses or taxes)    
Prospectus [Line Items]    
Average Annual Return, Percent [1] 25.02% 23.47%
iShares Large Cap Moderate Buffer ETF    
Prospectus [Line Items]    
Average Annual Return, Percent 16.32% 14.88%
Performance Inception Date   Jun. 28, 2023
iShares Large Cap Moderate Buffer ETF | After Taxes on Distributions    
Prospectus [Line Items]    
Average Annual Return, Percent [2] 16.03% 14.69%
Performance Inception Date [2]   Jun. 28, 2023
iShares Large Cap Moderate Buffer ETF | After Taxes on Distributions and Sales    
Prospectus [Line Items]    
Average Annual Return, Percent [2] 9.67% 11.35%
Performance Inception Date [2]   Jun. 28, 2023
[1]
The S&P 500 Index is an unmanaged index that covers 500 leading companies and captures approximately 80% coverage of available market capitalization.
[2]
After‑tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. Actual after‑tax returns depend on an investor’s tax situation and may differ from those shown, and after‑tax returns shown are not relevant to tax‑exempt investors or investors who hold shares through tax‑deferred arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”). Fund returns after taxes on distributions and sales of Fund shares are calculated assuming that an investor has sufficient capital gains of the same character from other investments to offset any capital losses from the sale of Fund shares. As a result, Fund returns after taxes on distributions and sales of Fund shares may exceed Fund returns before taxes and/or returns after taxes on distributions.