Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Supplement to Prospectus [Text Block]

rr_SupplementToProspectusTextBlock

BLACKROCK FUNDS^SM

BlackRock Global Impact Fund

(the “Fund”)

Supplement dated July 27, 2023 to the

Summary Prospectuses, Prospectuses and Statement of Additional Information (“SAI”) of the Fund,

each dated August 26, 2022, as supplemented to date

The Fund currently operates as a diversified fund under the Investment Company Act of 1940, as amended.

Accordingly, effective immediately, the following changes are made to the Fund’s Summary Prospectuses, Prospectuses and SAI, as applicable:

The last paragraph in the section of each Summary Prospectus entitled “Key Facts About BlackRock Global Impact Fund — Principal Investment Strategies of the Fund” and the last paragraph in the sections of each Prospectus entitled “Fund Overview — Key Facts About BlackRock Global Impact Fund — Principal Investment Strategies of the Fund” and “Details About the Funds — How Each Fund Invests — Principal Investment Strategies — Global Impact” are deleted in their entirety.

The section of each Summary Prospectus entitled “Key Facts About BlackRock Global Impact Fund — Principal Risks of Investing in the Fund” and the section of each Prospectus entitled “Fund Overview — Key Facts About BlackRock Global Impact Fund — Principal Risks of Investing in the Fund,” are amended to delete “Non‑Diversification Risk.”

BlackRock Global Impact Fund

Risk/Return:

rr_RiskReturnAbstract

Supplement to Prospectus [Text Block]

rr_SupplementToProspectusTextBlock

BLACKROCK FUNDS^SM

BlackRock Global Impact Fund

(the “Fund”)

Supplement dated July 27, 2023 to the

Summary Prospectuses, Prospectuses and Statement of Additional Information (“SAI”) of the Fund,

each dated August 26, 2022, as supplemented to date

The Fund currently operates as a diversified fund under the Investment Company Act of 1940, as amended.

Accordingly, effective immediately, the following changes are made to the Fund’s Summary Prospectuses, Prospectuses and SAI, as applicable:

The last paragraph in the section of each Summary Prospectus entitled “Key Facts About BlackRock Global Impact Fund — Principal Investment Strategies of the Fund” and the last paragraph in the sections of each Prospectus entitled “Fund Overview — Key Facts About BlackRock Global Impact Fund — Principal Investment Strategies of the Fund” and “Details About the Funds — How Each Fund Invests — Principal Investment Strategies — Global Impact” are deleted in their entirety.

The section of each Summary Prospectus entitled “Key Facts About BlackRock Global Impact Fund — Principal Risks of Investing in the Fund” and the section of each Prospectus entitled “Fund Overview — Key Facts About BlackRock Global Impact Fund — Principal Risks of Investing in the Fund,” are amended to delete “Non‑Diversification Risk.”