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Shareholder Report
 12 Months Ended
Dec. 31, 2024
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name BlackRock Funds
Entity Central Index Key 0000844779
Entity Investment Company Type N-1A
Document Period End Date Dec. 31, 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 annual shareholder report contains important information about BlackRock Exchange Portfolio (the “Fund”) for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual 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 year?
(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 $91 0.84%
Expenses Paid, Amount $ 91
Expense Ratio, Percent 0.84%
Factors Affecting Performance [Text Block]
How did the Fund perform last year?
  • For the reporting period ended December 31, 2024, the Fund's BlackRock Shares returned 16.07%.
  • For the same period, the S&P 500® Index returned 25.02%.
What contributed to performance?
Stock selection in the financials, information technology, and consumer staples sectors contributed to absolute performance. In financials, a position in a Nebraska-based diversified insurance and investment company was a key contributor. The outperformance in technology stemmed from an investment in a prominent software company that was among the mega-cap, technology-related stocks that led the broader market higher in 2024. A big-box discount retailer helped results in consumer staples.
What detracted from performance?
Stock selection in the healthcare and energy sectors detracted. In healthcare, a position in a large-cap pharmaceutical stock had the largest adverse impact. The shortfall in energy resulted from a downturn in an oil services company expected to come under pressure from reduced investment by major producers. While no other sectors detracted from absolute performance, the Fund lost ground in the food products industry largely due to a position in a prominent snack company.
The views expressed reflect the opinions of BlackRock as of the date of this report and are subject to change based on changes in market, economic or other conditions. These views are not intended to be a forecast of future events and are no guarantee of future results.
Performance Past Does Not Indicate Future [Text] Past performance is not an indication of future results.
Line Graph [Table Text Block]
Fund performance
Cumulative performance: January 1, 2015 through December 31, 2024
Initial investment of $10,000
Fund Performance - Growth of 10K
See “Average annual total returns” for additional information on fund performance.
Average Annual Return [Table Text Block]
Average annual total returns
1 Year 5 Years 10 Years
BlackRock Shares 16.07 % 13.66 % 11.70 %
S&P 500® Index 25.02 14.53 13.10
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 $ 263,078,705
Holdings Count | Holding 28
Advisory Fees Paid, Amount $ 1,292,473
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
Key Fund statistics
Net Assets $263,078,705
Number of Portfolio Holdings 28
Net Investment Advisory Fees $1,292,473
Portfolio Turnover Rate 0%
Holdings [Text Block]
What did the Fund invest in?
(as of December 31, 2024)
Sector allocation
Sector(a) Percent of
Net Assets
Financials 32.9 %
Information Technology 32.6 %
Health Care 12.9 %
Consumer Staples 10.3 %
Industrials 7.8 %
Energy 3.6 %
Short-Term Securities 0.2 %
Liabilities in Excess of Other Assets (0.3 )%
Ten largest holdings
Security(b) Percent of
Net Assets
Microsoft Corp. 31.6 %
Berkshire Hathaway, Inc., Class B 12.9 %
JPMorgan Chase & Co. 8.3 %
General Dynamics Corp. 7.8 %
American Express Co. 6.9 %
Visa, Inc., Class A 4.8 %
AstraZeneca PLC, ADR 3.2 %
Johnson & Johnson 3.0 %
Walmart, Inc. 2.8 %
Merck & Co., Inc. 2.6 %
​(a)
For purposes of this report, sector sub-classifications may differ from those utilized by the Fund for compliance purposes.
​(b)
Excludes short-term securities.
Largest Holdings [Text Block]
Ten largest holdings
Security(b) Percent of
Net Assets
Microsoft Corp. 31.6 %
Berkshire Hathaway, Inc., Class B 12.9 %
JPMorgan Chase & Co. 8.3 %
General Dynamics Corp. 7.8 %
American Express Co. 6.9 %
Visa, Inc., Class A 4.8 %
AstraZeneca PLC, ADR 3.2 %
Johnson & Johnson 3.0 %
Walmart, Inc. 2.8 %
Merck & Co., Inc. 2.6 %
(b)Excludes short-term securities.