Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

BLACKROCK FUNDS

Prospectus Date

rr_ProspectusDate

Jan. 28, 2019

Supplement to Prospectus [Text Block]

rr_SupplementToProspectusTextBlock

BLACKROCK FUNDS^SM

BlackRock All-Cap Energy & Resources Portfolio

(the “Fund”)

Supplement dated January 17, 2020

to the Fund’s Summary Prospectuses, Prospectuses

and Statement of Additional Information (the “SAI”)

Effective January 13, 2020, the Fund changed its name to BlackRock Energy Opportunities Fund. Accordingly, effective January 13, 2020, references to the Fund’s name in the Fund’s Summary Prospectuses, Prospectuses and SAI are changed to reflect the new Fund name.

BLACKROCK ENERGY OPPORTUNITIES FUND

Risk/Return:

rr_RiskReturnAbstract

Supplement to Prospectus [Text Block]

rr_SupplementToProspectusTextBlock

BLACKROCK FUNDS^SM

BlackRock All-Cap Energy & Resources Portfolio

(the “Fund”)

Supplement dated January 17, 2020

to the Fund’s Summary Prospectuses, Prospectuses

and Statement of Additional Information (the “SAI”)

Effective January 13, 2020, the Fund changed its name to BlackRock Energy Opportunities Fund. Accordingly, effective January 13, 2020, references to the Fund’s name in the Fund’s Summary Prospectuses, Prospectuses and SAI are changed to reflect the new Fund name.