INSTITUTIONAL [Member] Performance Management - INSTITUTIONAL

Oct. 31, 2025

INSTITUTIONAL For Participants

Prospectus [Line Items]

Money Market Seven Day Yield

3.80%

TEMPCASH

Prospectus [Line Items]

Bar Chart and Performance Table [Heading]

Performance Information

Performance Narrative [Text Block]

The information shows you how TempCash’s performance has varied year by year and provides some indication of the risks of investing in the Fund. As with all such investments, past performance is not an indication of future results. To the extent that dividends and distributions have been paid by the Fund, the performance information for the Fund in the chart and table assumes reinvestment of the dividends and distributions. The table includes all applicable fees. If BlackRock and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund’s returns would have been lower. The Fund is a money market fund managed pursuant to the requirements of Rule 2a-7 under the 1940 Act. Effective October 11, 2016, the Fund implemented additional amendments to Rule 2a-7, including the adoption of a floating net asset value (“NAV”) per Fund share. Fund performance shown prior to October 11, 2016 is based on 1940 Act rules then in effect and is not an indication of future returns. Between October 1, 2015 and February 28, 2017, the Fund operated under a different investment policy such that it would invest only in securities that, under normal circumstances, would mature (without reference to interest rate adjustment dates), or were subject to an unconditional demand feature that was exercisable and payable, within 5 business days or less. Investors should note that the historical yield and performance information shown for this period are based on the investment policy of the Fund relating to maturity restrictions then in effect. Updated information on the Fund’s performance can be obtained by visiting www.blackrock.com/cash or can be obtained by phone at (800) 441-7450.

Performance Past Does Not Indicate Future [Text]

As with all such investments, past performance is not an indication of future results.

Performance Information Illustrates Variability of Returns [Text]

The information shows you how TempCash’s performance has varied year by year and provides some indication of the risks of investing in the Fund.

Bar Chart [Heading]

Institutional Shares ANNUAL TOTAL RETURNS TempCash As of 12/31

Bar Chart Closing [Text Block]

During the ten-year period shown in the bar chart, the highest return for a quarter was 1.41% (quarter ended December 31, 2023) and the lowest return for a quarter was -0.03% (quarter ended March 31, 2022).

Performance Table Heading

For the periods ended 12/31/25 Average Annual Total Returns

Performance Table Narrative

Current Yield: You may obtain the Fund’s current 7‑day yield by calling (800) 441‑7450 or by visiting the Fund’s website at www.blackrock.com/cash.

Money Market Seven Day Yield Phone

(800) 441‑7450

Performance Availability Website Address [Text]

www.blackrock.com/cash

Performance Availability Phone [Text]

(800) 441-7450

TEMPCASH | INSTITUTIONAL For Participants

Prospectus [Line Items]

Highest Quarterly Return, Label [Optional Text]

highest return

Highest Quarterly Return

1.41%

Highest Quarterly Return, Date

Dec. 31, 2023

Lowest Quarterly Return, Label [Optional Text]

lowest return

Lowest Quarterly Return

(0.03%)

Lowest Quarterly Return, Date

Mar. 31, 2022