XML 11 R2.htm IDEA: XBRL DOCUMENT v3.24.4
Shareholder Report
 6 Months Ended
Oct. 31, 2024
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name BlackRock Funds
Entity Central Index Key 0000844779
Entity Investment Company Type N-1A
Document Period End Date Oct. 31, 2024
C000237396 [Member]  
Shareholder Report [Line Items]  
Fund Name Circle Reserve Fund
Class Name Institutional Shares
Trading Symbol USDXX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Circle Reserve Fund (the “Fund”) for the period of May 1, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at blackrock.com/fundreports. You can also request this information by contacting us at (800) 441‑7450.
Additional Information Phone Number (800) 441‑7450
Additional Information Website blackrock.com/fundreports
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Class name Costs of a $10,000
investment		 Costs paid as a percentage of a
$10,000 investment
Institutional Shares $5 0.09%(a)
​(a)
Annualized.
Expenses Paid, Amount $ 5
Expense Ratio, Percent 0.09% [1]
Performance Past Does Not Indicate Future [Text] Past performance is not an indication of future results.
Net Assets $ 30,438,870,951
Holdings Count | Holding 27
Additional Fund Statistics [Text Block]
Key Fund statistics
Net Assets $30,438,870,951
Number of Portfolio Holdings 27
Current seven-day yields as of October 31, 2024 (The 7-day SEC Yield may differ from the 7-Day Yield shown due to the fact that the 7-Day SEC Yield excludes distributed capital gains.)
7-Day SEC Yield 4.78%
7-Day Yield 4.78%
Holdings [Text Block]
What did the Fund invest in?
(as of October 31, 2024)
Portfolio composition
Asset Type Percent of
Net Assets
Repurchase Agreements 62.1 %
U.S. Treasury Obligations 35.0 %
Other Assets Less Liabilities 2.9 %
[1] Annualized.