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Shareholder Report
 12 Months Ended
Jan. 31, 2025
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 Jan. 31, 2025
C000118601 [Member]  
Shareholder Report [Line Items]  
Fund Name BlackRock Real Estate Securities Fund
Class Name Institutional Shares
Trading Symbol BIREX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about BlackRock Real Estate Securities Fund (the “Fund”) for the period of February 1, 2024 to January 31, 2025.
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
Institutional Shares $79 0.75%
Expenses Paid, Amount $ 79
Expense Ratio, Percent 0.75%
Factors Affecting Performance [Text Block]
How did the Fund perform last year?
  • For the reporting period ended January 31, 2025, the Fund's Institutional Shares returned 10.23%.
  • For the same period, the Russell 1000® Index returned 26.71% and the FTSE Nareit All Equity REITs Net Index returned 10.06%.
What contributed to absolute performance?
In sector terms, positive contributions were led by holdings of health care, apartment, data center, retail and triple net lease real estate investment trusts (“REITs”). Leading individual contributors included a health care infrastructure investor, a data center and colocation provider, a multifamily housing investor, a triple net lease retail space provider, and a shopping mall investor.
What detracted from absolute performance?
In sector terms, detractors included holdings within industrial and tower REITs. Individual positions that weighed most heavily on return included an investor in post-acute care facilities and senior living communities, an investor in Southern California industrial properties, a cold storage solutions provider, a wireless infrastructure operator, and an investor in single-family rental homes.
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: February 1, 2015 through January 31, 2025
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
Institutional Shares 10.23 % 3.54 % 5.26 %
Russell 1000® Index 26.71 14.97 13.54
FTSE Nareit All Equity REITs Net Index 10.06 2.09 4.09
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 $ 344,489,738
Holdings Count | Holding 44
Advisory Fees Paid, Amount $ 1,797,078
Investment Company Portfolio Turnover 59.00%
Additional Fund Statistics [Text Block]
Key Fund statistics
Net Assets $344,489,738
Number of Portfolio Holdings 44
Net Investment Advisory Fees $1,797,078
Portfolio Turnover Rate 59%
Holdings [Text Block]
What did the Fund invest in?
(as of January 31, 2025)
Industry allocation
Industry(a) Percent of
Net Assets
Specialized REITs 37.7 %
Retail REITs 14.6 %
Residential REITs 13.7 %
Health Care REITs 12.6 %
Industrial REITs 12.5 %
Office REITs 3.4 %
Hotel & Resort REITs 2.5 %
Diversified REITs 1.4 %
Short-Term Securities 1.2 %
Other Assets Less Liabilities 0.4 %
Ten largest holdings
Security(b) Percent of
Net Assets
Prologis, Inc. 9.1 %
Equinix, Inc. 7.2 %
American Tower Corp. 6.3 %
AvalonBay Communities, Inc. 5.3 %
Welltower, Inc. 4.9 %
Simon Property Group, Inc. 4.6 %
Mid-America Apartment Communities, Inc. 4.1 %
SBA Communications Corp. 4.1 %
VICI Properties, Inc. 3.7 %
Extra Space Storage, Inc. 3.6 %
​(a)
For purposes of this report, industry 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
Prologis, Inc. 9.1 %
Equinix, Inc. 7.2 %
American Tower Corp. 6.3 %
AvalonBay Communities, Inc. 5.3 %
Welltower, Inc. 4.9 %
Simon Property Group, Inc. 4.6 %
Mid-America Apartment Communities, Inc. 4.1 %
SBA Communications Corp. 4.1 %
VICI Properties, Inc. 3.7 %
Extra Space Storage, Inc. 3.6 %
(b)Excludes short-term securities.
C000118599 [Member]  
Shareholder Report [Line Items]  
Fund Name BlackRock Real Estate Securities Fund
Class Name Investor A Shares
Trading Symbol BAREX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about BlackRock Real Estate Securities Fund (the “Fund”) for the period of February 1, 2024 to January 31, 2025.
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
Investor A Shares $105 1.00%
Expenses Paid, Amount $ 105
Expense Ratio, Percent 1.00%
Factors Affecting Performance [Text Block]
How did the Fund perform last year?
  • For the reporting period ended January 31, 2025, the Fund's Investor A Shares returned 10.03%.
  • For the same period, the Russell 1000® Index returned 26.71% and the FTSE Nareit All Equity REITs Net Index returned 10.06%.
What contributed to absolute performance?
In sector terms, positive contributions were led by holdings of health care, apartment, data center, retail and triple net lease real estate investment trusts (“REITs”). Leading individual contributors included a health care infrastructure investor, a data center and colocation provider, a multifamily housing investor, a triple net lease retail space provider, and a shopping mall investor.
What detracted from absolute performance?
In sector terms, detractors included holdings within industrial and tower REITs. Individual positions that weighed most heavily on return included an investor in post-acute care facilities and senior living communities, an investor in Southern California industrial properties, a cold storage solutions provider, a wireless infrastructure operator, and an investor in single-family rental homes.
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: February 1, 2015 through January 31, 2025
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
Investor A Shares 10.03 % 3.28 % 4.99 %
Investor A Shares (with sales charge) 4.25 2.17 4.43
Russell 1000® Index 26.71 14.97 13.54
FTSE Nareit All Equity REITs Net Index 10.06 2.09 4.09
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 $ 344,489,738
Holdings Count | Holding 44
Advisory Fees Paid, Amount $ 1,797,078
Investment Company Portfolio Turnover 59.00%
Additional Fund Statistics [Text Block]
Key Fund statistics
Net Assets $344,489,738
Number of Portfolio Holdings 44
Net Investment Advisory Fees $1,797,078
Portfolio Turnover Rate 59%
Holdings [Text Block]
What did the Fund invest in?
(as of January 31, 2025)
Industry allocation
Industry(a) Percent of
Net Assets
Specialized REITs 37.7 %
Retail REITs 14.6 %
Residential REITs 13.7 %
Health Care REITs 12.6 %
Industrial REITs 12.5 %
Office REITs 3.4 %
Hotel & Resort REITs 2.5 %
Diversified REITs 1.4 %
Short-Term Securities 1.2 %
Other Assets Less Liabilities 0.4 %
Ten largest holdings
Security(b) Percent of
Net Assets
Prologis, Inc. 9.1 %
Equinix, Inc. 7.2 %
American Tower Corp. 6.3 %
AvalonBay Communities, Inc. 5.3 %
Welltower, Inc. 4.9 %
Simon Property Group, Inc. 4.6 %
Mid-America Apartment Communities, Inc. 4.1 %
SBA Communications Corp. 4.1 %
VICI Properties, Inc. 3.7 %
Extra Space Storage, Inc. 3.6 %
​(a)
For purposes of this report, industry 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
Prologis, Inc. 9.1 %
Equinix, Inc. 7.2 %
American Tower Corp. 6.3 %
AvalonBay Communities, Inc. 5.3 %
Welltower, Inc. 4.9 %
Simon Property Group, Inc. 4.6 %
Mid-America Apartment Communities, Inc. 4.1 %
SBA Communications Corp. 4.1 %
VICI Properties, Inc. 3.7 %
Extra Space Storage, Inc. 3.6 %
(b)Excludes short-term securities.
C000118600 [Member]  
Shareholder Report [Line Items]  
Fund Name BlackRock Real Estate Securities Fund
Class Name Investor C Shares
Trading Symbol BCREX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about BlackRock Real Estate Securities Fund (the “Fund”) for the period of February 1, 2024 to January 31, 2025.
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
Investor C Shares $183 1.75%
Expenses Paid, Amount $ 183
Expense Ratio, Percent 1.75%
Factors Affecting Performance [Text Block]
How did the Fund perform last year?
  • For the reporting period ended January 31, 2025, the Fund's Investor C Shares returned 9.18%.
  • For the same period, the Russell 1000® Index returned 26.71% and the FTSE Nareit All Equity REITs Net Index returned 10.06%.
What contributed to absolute performance?
In sector terms, positive contributions were led by holdings of health care, apartment, data center, retail and triple net lease real estate investment trusts (“REITs”). Leading individual contributors included a health care infrastructure investor, a data center and colocation provider, a multifamily housing investor, a triple net lease retail space provider, and a shopping mall investor.
What detracted from absolute performance?
In sector terms, detractors included holdings within industrial and tower REITs. Individual positions that weighed most heavily on return included an investor in post-acute care facilities and senior living communities, an investor in Southern California industrial properties, a cold storage solutions provider, a wireless infrastructure operator, and an investor in single-family rental homes.
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: February 1, 2015 through January 31, 2025
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
Investor C Shares 9.18 % 2.50 % 4.37 %
Investor C Shares (with sales charge) 8.18 2.50 4.37
Russell 1000® Index 26.71 14.97 13.54
FTSE Nareit All Equity REITs Net Index 10.06 2.09 4.09
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 $ 344,489,738
Holdings Count | Holding 44
Advisory Fees Paid, Amount $ 1,797,078
Investment Company Portfolio Turnover 59.00%
Additional Fund Statistics [Text Block]
Key Fund statistics
Net Assets $344,489,738
Number of Portfolio Holdings 44
Net Investment Advisory Fees $1,797,078
Portfolio Turnover Rate 59%
Holdings [Text Block]
What did the Fund invest in?
(as of January 31, 2025)
Industry allocation
Industry(a) Percent of
Net Assets
Specialized REITs 37.7 %
Retail REITs 14.6 %
Residential REITs 13.7 %
Health Care REITs 12.6 %
Industrial REITs 12.5 %
Office REITs 3.4 %
Hotel & Resort REITs 2.5 %
Diversified REITs 1.4 %
Short-Term Securities 1.2 %
Other Assets Less Liabilities 0.4 %
Ten largest holdings
Security(b) Percent of
Net Assets
Prologis, Inc. 9.1 %
Equinix, Inc. 7.2 %
American Tower Corp. 6.3 %
AvalonBay Communities, Inc. 5.3 %
Welltower, Inc. 4.9 %
Simon Property Group, Inc. 4.6 %
Mid-America Apartment Communities, Inc. 4.1 %
SBA Communications Corp. 4.1 %
VICI Properties, Inc. 3.7 %
Extra Space Storage, Inc. 3.6 %
​(a)
For purposes of this report, industry 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
Prologis, Inc. 9.1 %
Equinix, Inc. 7.2 %
American Tower Corp. 6.3 %
AvalonBay Communities, Inc. 5.3 %
Welltower, Inc. 4.9 %
Simon Property Group, Inc. 4.6 %
Mid-America Apartment Communities, Inc. 4.1 %
SBA Communications Corp. 4.1 %
VICI Properties, Inc. 3.7 %
Extra Space Storage, Inc. 3.6 %
(b)Excludes short-term securities.