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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName BLACKROCK FUNDS
Prospectus Date rr_ProspectusDate Jan. 28, 2014
Supplement [Text Block] bf1_SupplementTextBlock

BLACKROCK FUNDSSM
BlackRock Managed Volatility Portfolio
(the “Fund”)

Supplement dated June 2, 2014
to the Fund’s Prospectus dated January 28, 2014 (as amended April 18, 2014)

Effective immediately, the following changes are made to the Fund’s Prospectus:

The section entitled “Fund Overview — Performance Information” is supplemented as follows:

Effective immediately, the BofA Merrill Lynch 3-Month U.S. Treasury Bill Index is added to the performance benchmarks against which the Fund measures its performance. Fund management believes that this addition to the performance benchmarks more accurately reflects the investment strategy of the Fund.

For the one-, five- and ten-year periods ended December 31, 2013, the average annual total returns for the BofA Merrill Lynch 3-Month U.S. Treasury Bill Index were 0.07%, 0.12% and 1.68%, respectively.
BLACKROCK MANAGED VOLATILITY PORTFOLIO
  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] bf1_SupplementTextBlock

BLACKROCK FUNDSSM
BlackRock Managed Volatility Portfolio
(the “Fund”)

Supplement dated June 2, 2014
to the Fund’s Prospectus dated January 28, 2014 (as amended April 18, 2014)

Effective immediately, the following changes are made to the Fund’s Prospectus:

The section entitled “Fund Overview — Performance Information” is supplemented as follows:

Effective immediately, the BofA Merrill Lynch 3-Month U.S. Treasury Bill Index is added to the performance benchmarks against which the Fund measures its performance. Fund management believes that this addition to the performance benchmarks more accurately reflects the investment strategy of the Fund.

For the one-, five- and ten-year periods ended December 31, 2013, the average annual total returns for the BofA Merrill Lynch 3-Month U.S. Treasury Bill Index were 0.07%, 0.12% and 1.68%, respectively.