Objective, Primary [Text Block]

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Risk/Return [Heading]

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Fund Overview Key Facts About BlackRock Advantage Large Cap Growth Fund

Objective [Heading]

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Investment Objective

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The investment objective of BlackRock Advantage Large Cap Growth Fund (the “Fund”), a series of BlackRock Funds^SM (the “Trust”), is to seek long-term capital appreciation.

Expense [Heading]

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Fees and Expenses of the Fund

Expense Narrative [Text Block]

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This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to your financial professional or your selected securities dealer, broker, investment adviser, service provider or industry professional (including BlackRock Advisors, LLC (“BlackRock”) and its affiliates) (each, a “Financial Intermediary”), which are not reflected in the table and example below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $25,000 in the fund complex advised by BlackRock or its affiliates. More information about these and other discounts is available from your Financial Intermediary and in the “Details About the Share Classes” and the “Intermediary-Defined Sales Charge Waiver Policies” sections on pages 24 and A-1, respectively, of the Fund’s prospectus and in the “Purchase of Shares” section on page II-87 of Part II of the Fund’s Statement of Additional Information.

Shareholder Fees Caption [Text]

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Shareholder Fees(fees paid directly from your investment)

Operating Expenses Caption [Text]

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Annual Fund Operating Expenses(expenses that you pay each year as apercentage of the value of your investment)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

June 30, 2023

Portfolio Turnover [Heading]

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Portfolio Turnover:

Portfolio Turnover [Text Block]

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The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 134% of the average value of its portfolio.

Portfolio Turnover, Rate

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134.00%

Expenses Deferred Charges [Text Block]

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A contingent deferred sales charge (“CDSC”) of 1.00% is assessed on certain redemptions of Investor A Shares made within 18 months after purchase where no initial sales charge was paid at time of purchase as part of an investment of $1,000,000 or more.

Expense Breakpoint Discounts [Text]

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You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $25,000 in the fund complex advised by BlackRock or its affiliates.

Expense Breakpoint, Minimum Investment Required [Amount]

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$ 25,000

Expense Example [Heading]

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Example:

Expense Example Narrative [Text Block]

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This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example, No Redemption, By Year, Caption [Text]

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You would pay the following expenses if you did not redeem your shares:

Strategy [Heading]

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Principal Investment Strategies of the Fund

Strategy Narrative [Text Block]

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Under normal circumstances, the Fund seeks to invest at least 80% of its net assets plus the amount of any borrowings for investment purposes in large cap equity securities of U.S. issuers and derivatives that have similar economic characteristics to such securities. For purposes of the Fund’s 80% policy, large cap equity securities are equity securities that at the time of purchase have a market capitalization within the range of companies included in the Russell 1000^® Growth Index (the “Russell 1000 Growth Index”). The Fund is a growth fund and primarily intends to invest in equity securities, which include common stock, preferred stock and convertible securities, or other financial instruments that are components of, or have characteristics similar to, the securities included in the Russell 1000 Growth Index. The Russell 1000 Growth Index is a capitalization-weighted index from a broad range of industries chosen for market size, liquidity and industry group representation. The Fund primarily seeks to buy common stock and may also invest in preferred stock and convertible securities. From time to time, the Fund may invest in shares of companies through “new issues” or initial public offerings (“IPOs”). The Fund may use derivatives, including options, futures, swaps (including, but not limited to, total return swaps, some of which may be referred to as contracts for difference) and forward contracts, both to seek to increase the return of the Fund and to hedge (or protect) the value of its assets against adverse movements in interest rates and movements in the securities markets. In order to manage cash flows into or out of the Fund effectively, the Fund may buy and sell financial futures contracts or options on such contracts. Derivatives are financial instruments whose value is derived from another security, a currency or an index, including but not limited to the Russell 1000 Growth Index. The use of options, futures, swaps and forward contracts can be effective in protecting or enhancing the value of the Fund’s assets.

Risk [Heading]

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Principal Risks of Investing in the Fund

Risk Narrative [Text Block]

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Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time. You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments. The following is a summary description of the principal risks of investing in the Fund. The order of the below risk factors does not indicate the significance of any particular risk factor.

■

Commodities Related Investments Risk — Exposure to the commodities markets may subject the Fund to greater volatility than investments in traditional securities. The value of commodity-linked derivative investments may be affected by changes in overall market movements, commodity index volatility, changes in interest rates, or factors

	affecting a particular industry or commodity, such as drought, floods, weather, embargoes, tariffs and international economic, political and regulatory developments.
■	Convertible Securities Risk — The market value of a convertible security performs like that of a regular debt security; that is, if market interest rates rise, the value of a convertible security usually falls. In addition, convertible securities are subject to the risk that the issuer will not be able to pay interest or dividends when due, and their market value may change based on changes in the issuer’s credit rating or the market’s perception of the issuer’s creditworthiness. Since it derives a portion of its value from the common stock into which it may be converted, a convertible security is also subject to the same types of market and issuer risks that apply to the underlying common stock.
■	Derivatives Risk — The Fund’s use of derivatives may increase its costs, reduce the Fund’s returns and/or increase volatility. Derivatives involve significant risks, including:
	Volatility Risk — Volatility is defined as the characteristic of a security, an index or a market to fluctuate significantly in price within a short time period. A risk of the Fund’s use of derivatives is that the fluctuations in their values may not correlate with the overall securities markets.
	Counterparty Risk — Derivatives are also subject to counterparty risk, which is the risk that the other party in the transaction will not fulfill its contractual obligation.
	Market and Illiquidity Risk — The possible lack of a liquid secondary market for derivatives and the resulting inability of the Fund to sell or otherwise close a derivatives position could expose the Fund to losses and could make derivatives more difficult for the Fund to value accurately.
	Valuation Risk — Valuation may be more difficult in times of market turmoil since many investors and market makers may be reluctant to purchase complex instruments or quote prices for them.
	Hedging Risk — Hedges are sometimes subject to imperfect matching between the derivative and the underlying security, and there can be no assurance that the Fund’s hedging transactions will be effective. The use of hedging may result in certain adverse tax consequences.
	Tax Risk — Certain aspects of the tax treatment of derivative instruments, including swap agreements and commodity-linked derivative instruments, are currently unclear and may be affected by changes in legislation, regulations or other legally binding authority. Such treatment may be less favorable than that given to a direct investment in an underlying asset and may adversely affect the timing, character and amount of income the Fund realizes from its investments.
	Regulatory Risk — Derivative contracts, including, without limitation, swaps, currency forwards and non-deliverable forwards, are subject to regulation under the Dodd-Frank Wall Street Reform and Consumer Protection Act (the “Dodd-Frank Act”) in the United States and under comparable regimes in Europe, Asia and other non-U.S. jurisdictions. Under the Dodd-Frank Act, certain derivatives are subject to margin requirements and swap dealers are required to collect margin from the Fund with respect to such derivatives. Specifically, regulations are now in effect that require swap dealers to post and collect variation margin (comprised of specified liquid instruments and subject to a required haircut) in connection with trading of over-the-counter (“OTC”) swaps with the Fund. Shares of investment companies (other than certain money market funds) may not be posted as collateral under these regulations. Requirements for posting of initial margin in connection with OTC swaps will be phased-in through at least 2021. In addition, regulations adopted by global prudential regulators that are now in effect require certain bank-regulated counterparties and certain of their affiliates to include in certain financial contracts, including many derivatives contracts, terms that delay or restrict the rights of counterparties, such as the Fund, to terminate such contracts, foreclose upon collateral, exercise other default rights or restrict transfers of credit support in the event that the counterparty and/or its affiliates are subject to certain types of resolution or insolvency proceedings. The implementation of these requirements with respect to derivatives, as well as regulations under the Dodd-Frank Act regarding clearing, mandatory trading and margining of other derivatives, may increase the costs and risks to the Fund of trading in these instruments and, as a result, may affect returns to investors in the Fund.
	On October 28, 2020, the SEC adopted new regulations governing the use of derivatives by registered investment companies (“Rule 18f-4”). The Fund will be required to implement and comply with Rule 18f-4 by August 19, 2022. Once implemented, Rule 18f-4 will impose limits on the amount of derivatives a fund can enter into, eliminate the asset segregation framework currently used by funds to comply with Section 18 of the Investment Company Act of 1940, as amended (the “Investment Company Act”), treat derivatives as senior securities and require funds whose use of derivatives is more than a limited specified exposure amount to establish and maintain a comprehensive derivatives risk management program and appoint a derivatives risk manager.
■	Equity Securities Risk — Stock markets are volatile. The price of equity securities fluctuates based on changes in a company’s financial condition and overall market and economic conditions.

■	High Portfolio Turnover Risk — The Fund may engage in active and frequent trading of its portfolio securities. High portfolio turnover (more than 100%) may result in increased transaction costs to the Fund, including brokerage commissions, dealer mark-ups and other transaction costs on the sale of the securities and on reinvestment in other securities. The sale of Fund portfolio securities may result in the realization and/or distribution to shareholders of higher capital gains or losses as compared to a fund with less active trading policies. These effects of higher than normal portfolio turnover may adversely affect Fund performance.
■	Investment Style Risk — Under certain market conditions, growth investments have performed better during the later stages of economic expansion. Therefore, this investment style may over time go in and out of favor. At times when the investment style used by the Fund is out of favor, the Fund may underperform other equity funds that use different investment styles.
■	Leverage Risk — Some transactions may give rise to a form of economic leverage. These transactions may include, among others, derivatives, and may expose the Fund to greater risk and increase its costs. The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations or to meet any required asset segregation requirements. Increases and decreases in the value of the Fund’s portfolio will be magnified when the Fund uses leverage.
■	Market Risk and Selection Risk — Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. The value of a security or other asset may decline due to changes in general market conditions, economic trends or events that are not specifically related to the issuer of the security or other asset, or factors that affect a particular issuer or issuers, exchange, country, group of countries, region, market, industry, group of industries, sector or asset class. Local, regional or global events such as war, acts of terrorism, the spread of infectious illness or other public health issues like pandemics or epidemics, recessions, or other events could have a significant impact on the Fund and its investments. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. The Fund seeks to pursue its investment objective by using proprietary models that incorporate quantitative analysis and is subject to “Model Risk” as described below. This means you may lose money.
	A recent outbreak of an infectious coronavirus has developed into a global pandemic that has resulted in numerous disruptions in the market and has had significant economic impact leaving general concern and uncertainty. The impact of this coronavirus, and other epidemics and pandemics that may arise in the future, could affect the economies of many nations, individual companies and the market in general ways that cannot necessarily be foreseen at the present time.
■	Model Risk — The Fund seeks to pursue its investment objective by using proprietary models that incorporate quantitative analysis. Investments selected using these models may perform differently than as forecasted due to the factors incorporated into the models and the weighting of each factor, changes from historical trends, and issues in the construction and implementation of the models (including, but not limited to, software issues and other technological issues). There is no guarantee that BlackRock’s use of these models will result in effective investment decisions for the Fund.
	The information and data used in the models may be supplied by third parties. Inaccurate or incomplete data may limit the effectiveness of the models. In addition, some of the data that BlackRock uses may be historical data, which may not accurately predict future market movement. There is a risk that the models will not be successful in selecting investments or in determining the weighting of investment positions that will enable the Fund to achieve its investment objective.
■	“New Issues” Risk — “New issues” are IPOs of equity securities. Securities issued in IPOs have no trading history, and information about the companies may be available for very limited periods. In addition, the prices of securities sold in IPOs may be highly volatile or may decline shortly after the IPO.
■	Preferred Securities Risk — Preferred securities may pay fixed or adjustable rates of return. Preferred securities are subject to issuer-specific and market risks applicable generally to equity securities. In addition, a company’s preferred securities generally pay dividends only after the company makes required payments to holders of its bonds and other debt. For this reason, the value of preferred securities will usually react more strongly than bonds and other debt to actual or perceived changes in the company’s financial condition or prospects. Preferred securities of smaller companies may be more vulnerable to adverse developments than preferred securities of larger companies.

Risk Lose Money [Text]

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You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.

Bar Chart and Performance Table [Heading]

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Performance Information

Performance Narrative [Text Block]

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Effective June 12, 2017, the Fund changed its name, investment objective, investment process and investment strategies. Performance for the periods between July 31, 2012 and June 11, 2017 shown below is based on the investment process and investment strategies utilized by the Fund at that time under the name “BlackRock Flexible Equity Fund.”

Effective July 31, 2012, the Fund changed its investment objective and its investment strategies. Performance for the periods prior to July 31, 2012 shown below is based on the investment strategies utilized by the Fund at that time, which focused on investing in equity securities issued by U.S. mid-capitalization value companies.

The information shows you how the Fund’s performance has varied year by year and provides some indication of the risks of investing in the Fund. The table compares the Fund’s performance to that of the Russell 1000 Growth Index. To the extent that dividends and distributions have been paid by the Fund, the performance information for the Fund in the chart and the table assumes reinvestment of the dividends and distributions. As with all such investments, past performance (before and after taxes) is not an indication of future results. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. However, the table includes all applicable fees and sales charges. If BlackRock and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund’s returns would have been lower. Updated information on the Fund’s performance, including its current net asset value, can be obtained by visiting http://www.blackrock.com or can be obtained by phone at (800) 882-0052.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information shows you how the Fund’s performance has varied year by year and provides some indication of the risks of investing in the Fund.

Performance Availability Phone [Text]

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(800) 882-0052

Performance Availability Website Address [Text]

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http://www.blackrock.com

Performance Past Does Not Indicate Future [Text]

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As with all such investments, past performance (before and after taxes) is not an indication of future results.

Bar Chart [Heading]

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Investor A SharesANNUAL TOTAL RETURNSBlackRock Advantage Large Cap Growth FundAs of 12/31

Bar Chart Does Not Reflect Sales Loads [Text]

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Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.

Bar Chart Closing [Text Block]

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During the ten-year period shown in the bar chart, the highest return for a quarter was 27.13% (quarter ended June 30, 2020) and the lowest return for a quarter was -22.13% (quarter ended September 30, 2011). The year-to-date return as of June 30, 2021 was 13.30%.

Performance Table Heading

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For the periods ended 12/31/20Average Annual Total Returns

Performance Table Does Reflect Sales Loads

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However, the table includes all applicable fees and sales charges.

Performance Table Uses Highest Federal Rate

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After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

Performance Table Not Relevant to Tax Deferred

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Actual after-tax returns depend on the investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares throughtax-deferred arrangements, such as 401(k) plans or individual retirement accounts.

Performance Table One Class of after Tax Shown [Text]

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After-tax returns are shown for Investor A Shares only, and the after-tax returns for Investor C, Institutional and Class R Shares will vary.

Performance Table Narrative

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After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares throughtax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Investor A Shares only, and the after-tax returns for Investor C, Institutional and Class R Shares will vary.

Investor A, C, Institutional and Class R | BLACKROCK ADVANTAGE LARGE CAP GROWTH FUND | Investor A Shares

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

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5.25%

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

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none

^[1]

rr_ManagementFeesOverAssets

0.57%

^[2]

rr_DistributionAndService12b1FeesOverAssets

0.25%

rr_OtherExpensesOverAssets

0.26%

rr_ExpensesOverAssets

1.08%

Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.21%)

^[2],[3]

rr_NetExpensesOverAssets

0.87%

^[2],[3]

rr_ExpenseExampleYear01

$ 609

rr_ExpenseExampleYear03

831

rr_ExpenseExampleYear05

1,070

Year to Date Return, Label

rr_ExpenseExampleYear10

$ 1,755

2011

rr_AnnualReturn2011

(5.57%)

2012

rr_AnnualReturn2012

10.94%

2013

rr_AnnualReturn2013

23.74%

2014

rr_AnnualReturn2014

0.76%

2015

rr_AnnualReturn2015

1.21%

2016

rr_AnnualReturn2016

9.99%

2017

rr_AnnualReturn2017

23.13%

2018

rr_AnnualReturn2018

(2.90%)

2019

rr_AnnualReturn2019

33.39%

2020

rr_AnnualReturn2020

34.09%

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year-to-date return

Bar Chart, Year to Date Return, Date

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Jun. 30, 2021

Bar Chart, Year to Date Return

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13.30%

Highest Quarterly Return, Label

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highest return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2020

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

27.13%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

lowest return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

Lowest Quarterly Return

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(22.13%)

rr_AverageAnnualReturnYear01

27.05%

rr_AverageAnnualReturnYear05

17.38%

Investor A, C, Institutional and Class R | BLACKROCK ADVANTAGE LARGE CAP GROWTH FUND | Investor C Shares

rr_AverageAnnualReturnYear10

11.41%

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

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rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

^[4]

rr_ManagementFeesOverAssets

0.57%

^[2]

rr_DistributionAndService12b1FeesOverAssets

1.00%

rr_OtherExpensesOverAssets

0.27%

rr_ExpensesOverAssets

1.84%

Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.22%)

^[2],[3]

rr_NetExpensesOverAssets

1.62%

^[2],[3]

rr_ExpenseExampleYear01

$ 265

rr_ExpenseExampleYear03

557

rr_ExpenseExampleYear05

975

rr_ExpenseExampleYear10

1,941

rr_ExpenseExampleNoRedemptionYear01

165

rr_ExpenseExampleNoRedemptionYear03

557

rr_ExpenseExampleNoRedemptionYear05

975

rr_ExpenseExampleNoRedemptionYear10

$ 1,941

rr_AverageAnnualReturnYear01

32.02%

rr_AverageAnnualReturnYear05

17.74%

Investor A, C, Institutional and Class R | BLACKROCK ADVANTAGE LARGE CAP GROWTH FUND | Institutional Shares

rr_AverageAnnualReturnYear10

11.32%

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

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rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

rr_ManagementFeesOverAssets

0.57%

^[2]

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

0.26%

rr_ExpensesOverAssets

0.83%

Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.21%)

^[2],[3]

rr_NetExpensesOverAssets

0.62%

^[2],[3]

rr_ExpenseExampleYear01

$ 63

rr_ExpenseExampleYear03

244

rr_ExpenseExampleYear05

440

rr_ExpenseExampleYear10

$ 1,006

rr_AverageAnnualReturnYear01

34.45%

rr_AverageAnnualReturnYear05

18.98%

Investor A, C, Institutional and Class R | BLACKROCK ADVANTAGE LARGE CAP GROWTH FUND | Class R Shares

rr_AverageAnnualReturnYear10

12.34%

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_RiskReturnAbstract

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

rr_ManagementFeesOverAssets

0.57%

^[2]

rr_DistributionAndService12b1FeesOverAssets

0.50%

rr_OtherExpensesOverAssets

0.29%

rr_ExpensesOverAssets

1.36%

Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.24%)

^[2],[3]

rr_NetExpensesOverAssets

1.12%

^[2],[3]

rr_ExpenseExampleYear01

$ 114

rr_ExpenseExampleYear03

356

rr_ExpenseExampleYear05

617

rr_ExpenseExampleYear10

$ 1,363

rr_AverageAnnualReturnYear01

33.69%

rr_AverageAnnualReturnYear05

18.31%

Investor A, C, Institutional and Class R | BLACKROCK ADVANTAGE LARGE CAP GROWTH FUND | Return After Taxes on Distributions | Investor A Shares

rr_AverageAnnualReturnYear10

11.64%

rr_RiskReturnAbstract

rr_AverageAnnualReturnYear01

24.59%

rr_AverageAnnualReturnYear05

15.62%

Investor A, C, Institutional and Class R | BLACKROCK ADVANTAGE LARGE CAP GROWTH FUND | Return After Taxes on Distributions and Sale of Fund Shares | Investor A Shares

rr_AverageAnnualReturnYear10

9.85%

rr_RiskReturnAbstract

rr_AverageAnnualReturnYear01

17.10%

rr_AverageAnnualReturnYear05

13.45%

Investor A, C, Institutional and Class R | BLACKROCK ADVANTAGE LARGE CAP GROWTH FUND | Russell 1000 Growth Index (Reflects no deduction for fees, expenses or taxes)

rr_AverageAnnualReturnYear10

8.81%

rr_RiskReturnAbstract

rr_AverageAnnualReturnYear01

38.49%

rr_AverageAnnualReturnYear05

21.00%