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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName BLACKROCK FUNDS
Prospectus Date rr_ProspectusDate Nov. 28, 2016
Supplement [Text Block] bf12_SupplementTextBlock

BLACKROCK FUNDSSM

BlackRock Multifactor USA Index Fund

(the "Fund")

Supplement dated April 5, 2017

to the Fund's Summary Prospectus, Prospectus

and Statement of Additional Information ("SAI"), each dated November 28, 2016

Effective June 19, 2017, the Fund will change its name to iShares Edge MSCI Multifactor USA Index Fund. Accordingly, effective June 19, 2017, references to the Fund's name in the Fund's Summary Prospectus, Prospectus and SAI are changed to reflect the new Fund name.
BlackRock Multifactor USA Index Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] bf12_SupplementTextBlock

BLACKROCK FUNDSSM

BlackRock Multifactor USA Index Fund

(the "Fund")

Supplement dated April 5, 2017

to the Fund's Summary Prospectus, Prospectus

and Statement of Additional Information ("SAI"), each dated November 28, 2016

Effective June 19, 2017, the Fund will change its name to iShares Edge MSCI Multifactor USA Index Fund. Accordingly, effective June 19, 2017, references to the Fund's name in the Fund's Summary Prospectus, Prospectus and SAI are changed to reflect the new Fund name.