Net Assets BlackRock Cash Funds: Institutional - SL Agency Shares BlackRock Cash Funds: Treasury - Institutional Shares BlackRock Cash Funds - Treasury SL Agency Shares Investment Company, Portfolio Turnover BlackRock Diversified Equity Fund - Institutional Shares BlackRock Diversified Equity Alpha Fund - Institutional Shares C000102141 [Member] iShares MSCI Total International Index Fund - Institutional Shares C000102140 [Member] iShares MSCI Total International Index Fund - Investor A Shares C000102142 [Member] iShares MSCI Total International Index Fund - Class K Shares iShares Russell 1000 Large-Cap Index Fund - Institutional Shares iShares Russell 1000 Large-Cap Index Fund - Investor A Shares iShares Russell 1000 Large-Cap Index Fund - Class K Shares C000117726 [Member] iShares S&P 500 Index Fund - Institutional Shares C000117728 [Member] iShares S&P 500 Index Fund - Service Shares C000117725 [Member] iShares S&P 500 Index Fund - Investor A Shares C000201951 [Member] iShares S&P 500 Index Fund - Investor P Shares C000212062 [Member] iShares S&P 500 Index Fund - Class G Shares C000011979 [Member] iShares S&P 500 Index Fund - Class K Shares iShares U.S. Aggregate Bond Index Fund - Institutional Shares iShares U.S. Aggregate Bond Index Fund - Investor A Shares iShares U.S. Aggregate Bond Index Fund - Investor P Shares iShares U.S. Aggregate Bond Index Fund - Class K Shares iShares U.S. Aggregate Bond Index Fund - Class K Shares