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Shareholder Report
 6 Months Ended
Jun. 30, 2024
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name BlackRock Funds
Entity Central Index Key 0000844779
Document Period End Date Jun. 30, 2024
C000004917 [Member]  
Shareholder Report [Line Items]  
Fund Name BlackRock Exchange Portfolio
Class Name BlackRock Shares
Trading Symbol STSEX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BlackRock Exchange Portfolio (the “Fund”) for the period of January 1, 2024 to June 30, 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) 441‑7762.
Additional Information Phone Number (800) 441‑7762
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
BlackRock Shares $39 0.74%
Expenses Paid, Amount $ 39
Expense Ratio, Percent 0.74%
Performance Past Does Not Indicate Future [Text] Past performance is not an indication of future results.
Average Annual Return [Table Text Block]
Average annual total returns
6-Month
Total
Returns		 1 Year 5 Years 10 Years
BlackRock Shares 14.05% 21.34% 15.28% 11.83%
S&P 500® Index 15.29% 24.56% 15.05% 12.86%
No Deduction of Taxes [Text Block] Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares.
Updated Performance Information Location [Text Block] Visit blackrock.com for more recent performance information.
Net Assets $ 261,641,408
Holdings Count | Holding 28
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
Key Fund statistics
Net Assets $261,641,408%
Number of Portfolio Holdings $28%
Portfolio Turnover Rate $0%
Holdings [Text Block]
What did the Fund invest in?
(as of June 30, 2024)
Sector allocation
Sector(a) Percent of
Net Assets
Information Technology 35.4)%
Financials 28.1)%
Health Care 14.5)%
Consumer Staples 9.1)%
Industrials 8.7)%
Energy 4.1)%
Short-Term Securities 0.2)%
Liabilities in Excess of Other Assets (0.1)%
Ten largest holdings
Security(b) Percent of
Net Assets
Microsoft Corp. 34.6%
Berkshire Hathaway, Inc., Class B 11.7%
General Dynamics Corp. 8.7%
JPMorgan Chase & Co. 7.0%
American Express Co. 5.4%
Visa, Inc., Class A 4.0%
AstraZeneca PLC, ADR 3.8%
Merck & Co., Inc. 3.2%
Johnson & Johnson 3.1%
Novartis AG, ADR 2.8%
​(a)
For purposes of this report, sector sub-classifications may differ from those utilized for compliance purposes.
​(b)
Excludes short-term securities.
Largest Holdings [Text Block]
Ten largest holdings
Security(b) Percent of
Net Assets
Microsoft Corp. 34.6%
Berkshire Hathaway, Inc., Class B 11.7%
General Dynamics Corp. 8.7%
JPMorgan Chase & Co. 7.0%
American Express Co. 5.4%
Visa, Inc., Class A 4.0%
AstraZeneca PLC, ADR 3.8%
Merck & Co., Inc. 3.2%
Johnson & Johnson 3.1%
Novartis AG, ADR 2.8%
(b)Excludes short-term securities.