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Shareholder Report
 6 Months Ended
Jul. 31, 2026
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 Jul. 31, 2026
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 semi-annual shareholder report contains important information about BlackRock Real Estate Securities Fund (the “Fund”) for the period of February 1, 2026 to July 31, 2026.
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
Investor C Shares $93 1.75%(a)
​(a)
Annualized.
Expenses Paid, Amount $ 93
Expense Ratio, Percent 1.75% [1]
Net Assets $ 443,468,353
Holdings Count | Holding 47
Investment Company Portfolio Turnover 57.00%
Additional Fund Statistics [Text Block]
Key Fund statistics
Net Assets $443,468,353
Number of Portfolio Holdings 47
Portfolio Turnover Rate 57%
Holdings [Text Block]
What did the Fund invest in?
(as of July 31, 2026)
Industry allocation
Industry(a) Percent of
Net Assets
Specialized REITs 29.7 %
Health Care REITs 19.9 %
Retail REITs 14.1 %
Residential REITs 11.2 %
Industrial REITs 11.2 %
Diversified REITs 3.5 %
Hotel & Resort REITs 2.9 %
Office REITs 2.1 %
IT Services 1.2 %
Diversified Telecommunication Services 0.9 %
Other# 1.1 %
Short-Term Securities 2.7 %
Liabilities in Excess of Other Assets (0.5 )%
Ten largest holdings
Security(b) Percent of
Net Assets
Prologis, Inc. 9.4 %
Welltower, Inc. 8.6 %
Equinix, Inc. 6.2 %
American Tower Corp. 6.0 %
Digital Realty Trust, Inc. 5.6 %
Public Storage 4.5 %
Equity Residential 3.5 %
WP Carey, Inc. 3.5 %
Janus Living, Inc., Class A 3.2 %
American Healthcare REIT, Inc. 3.1 %
​(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.
​#
Ten largest industries are presented. Additional industries are found in Other.
Largest Holdings [Text Block]
Ten largest holdings
Security(b) Percent of
Net Assets
Prologis, Inc. 9.4 %
Welltower, Inc. 8.6 %
Equinix, Inc. 6.2 %
American Tower Corp. 6.0 %
Digital Realty Trust, Inc. 5.6 %
Public Storage 4.5 %
Equity Residential 3.5 %
WP Carey, Inc. 3.5 %
Janus Living, Inc., Class A 3.2 %
American Healthcare REIT, Inc. 3.1 %
(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 semi-annual shareholder report contains important information about BlackRock Real Estate Securities Fund (the “Fund”) for the period of February 1, 2026 to July 31, 2026.
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
Investor A Shares $53 1.00%(a)
​(a)
Annualized.
Expenses Paid, Amount $ 53
Expense Ratio, Percent 1.00% [2]
Net Assets $ 443,468,353
Holdings Count | Holding 47
Investment Company Portfolio Turnover 57.00%
Additional Fund Statistics [Text Block]
Key Fund statistics
Net Assets $443,468,353
Number of Portfolio Holdings 47
Portfolio Turnover Rate 57%
Holdings [Text Block]
What did the Fund invest in?
(as of July 31, 2026)
Industry allocation
Industry(a) Percent of
Net Assets
Specialized REITs 29.7 %
Health Care REITs 19.9 %
Retail REITs 14.1 %
Residential REITs 11.2 %
Industrial REITs 11.2 %
Diversified REITs 3.5 %
Hotel & Resort REITs 2.9 %
Office REITs 2.1 %
IT Services 1.2 %
Diversified Telecommunication Services 0.9 %
Other# 1.1 %
Short-Term Securities 2.7 %
Liabilities in Excess of Other Assets (0.5 )%
Ten largest holdings
Security(b) Percent of
Net Assets
Prologis, Inc. 9.4 %
Welltower, Inc. 8.6 %
Equinix, Inc. 6.2 %
American Tower Corp. 6.0 %
Digital Realty Trust, Inc. 5.6 %
Public Storage 4.5 %
Equity Residential 3.5 %
WP Carey, Inc. 3.5 %
Janus Living, Inc., Class A 3.2 %
American Healthcare REIT, Inc. 3.1 %
​(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.
​#
Ten largest industries are presented. Additional industries are found in Other.
Largest Holdings [Text Block]
Ten largest holdings
Security(b) Percent of
Net Assets
Prologis, Inc. 9.4 %
Welltower, Inc. 8.6 %
Equinix, Inc. 6.2 %
American Tower Corp. 6.0 %
Digital Realty Trust, Inc. 5.6 %
Public Storage 4.5 %
Equity Residential 3.5 %
WP Carey, Inc. 3.5 %
Janus Living, Inc., Class A 3.2 %
American Healthcare REIT, Inc. 3.1 %
(b)Excludes short-term securities.
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 semi-annual shareholder report contains important information about BlackRock Real Estate Securities Fund (the “Fund”) for the period of February 1, 2026 to July 31, 2026.
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
Institutional Shares $40 0.75%(a)
​(a)
Annualized.
Expenses Paid, Amount $ 40
Expense Ratio, Percent 0.75% [3]
Net Assets $ 443,468,353
Holdings Count | Holding 47
Investment Company Portfolio Turnover 57.00%
Additional Fund Statistics [Text Block]
Key Fund statistics
Net Assets $443,468,353
Number of Portfolio Holdings 47
Portfolio Turnover Rate 57%
Holdings [Text Block]
What did the Fund invest in?
(as of July 31, 2026)
Industry allocation
Industry(a) Percent of
Net Assets
Specialized REITs 29.7 %
Health Care REITs 19.9 %
Retail REITs 14.1 %
Residential REITs 11.2 %
Industrial REITs 11.2 %
Diversified REITs 3.5 %
Hotel & Resort REITs 2.9 %
Office REITs 2.1 %
IT Services 1.2 %
Diversified Telecommunication Services 0.9 %
Other# 1.1 %
Short-Term Securities 2.7 %
Liabilities in Excess of Other Assets (0.5 )%
Ten largest holdings
Security(b) Percent of
Net Assets
Prologis, Inc. 9.4 %
Welltower, Inc. 8.6 %
Equinix, Inc. 6.2 %
American Tower Corp. 6.0 %
Digital Realty Trust, Inc. 5.6 %
Public Storage 4.5 %
Equity Residential 3.5 %
WP Carey, Inc. 3.5 %
Janus Living, Inc., Class A 3.2 %
American Healthcare REIT, Inc. 3.1 %
​(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.
​#
Ten largest industries are presented. Additional industries are found in Other.
Largest Holdings [Text Block]
Ten largest holdings
Security(b) Percent of
Net Assets
Prologis, Inc. 9.4 %
Welltower, Inc. 8.6 %
Equinix, Inc. 6.2 %
American Tower Corp. 6.0 %
Digital Realty Trust, Inc. 5.6 %
Public Storage 4.5 %
Equity Residential 3.5 %
WP Carey, Inc. 3.5 %
Janus Living, Inc., Class A 3.2 %
American Healthcare REIT, Inc. 3.1 %
(b)Excludes short-term securities.
[1]
Annualized.
[2] Annualized.
[3]
Annualized.