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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName BLACKROCK LIQUIDITY FUNDS
Prospectus Date rr_ProspectusDate Feb. 29, 2016
Supplement [Text Block] brlf3_SupplementTextBlock

BLACKROCK LIQUIDITY FUNDS

FedFund

(the “Fund”)

Supplement dated June 20, 2016 to the

Cash Plus Shares

Prospectus of the Fund, dated February 29, 2016

Effective as of July 1, 2016, BlackRock Advisors, LLC (“BlackRock”) has contractually agreed to cap certain expenses of the Fund at a lower level. To achieve this expense cap, BlackRock has agreed to waive fees and/or reimburse ordinary operating expenses in order to keep combined Management Fees and Miscellaneous/Other Expenses, excluding certain expenses described in the prospectus, from exceeding a certain limit. Accordingly, effective as of July 1, 2016, the Fund’s prospectus is amended as follows:

The section of the prospectus entitled “Fund Overview—Key Facts About FedFund—Fees and Expenses of the Fund” is deleted in its entirety and replaced with the following:

Fees and Expenses of the Fund

 

This table describes the fees and expenses that you may pay if you buy and hold Cash Plus Shares of FedFund.

 

Annual Fund Operating Expenses
(expenses that you pay each year as a percentage of
the value of your investment)		           Cash Plus
Shares*		  
Management Fee
              0.20 % 
Distribution (12b-1) Fees
              0.35 % 
Other Expenses
              0.51 % 
Shareholder Servicing Fees
      0.50 %         
Miscellaneous/Other Expenses
      0.01 %         
Total Annual Fund Operating Expenses
              1.06 % 
Fee Waivers and/or Expense Reimbursements1
              (0.04 )% 
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements1
              1.02 % 

 

* Fund currently active, but no assets in share class as of the fiscal year ended October 31, 2015.

 

1  As described in the “Management of the Funds” section of the Fund’s prospectus beginning on page 43, BlackRock Advisors, LLC (“BlackRock”), the Fund’s investment manager, has contractually agreed to waive fees and/or reimburse ordinary operating expenses in order to keep combined Management Fees and Miscellaneous/Other Expenses from exceeding 0.17% of average daily net assets through February 28, 2018. The agreement may be terminated upon 90 days’ notice by a majority of the non-interested trustees of the Trust or by a vote of a majority of the outstanding voting securities of the Fund.

Example:

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:

 

        1 Year        3 Years        5 Years        10 Years  
Cash Plus Shares
      $ 104         $ 333         $ 581         $ 1,291   
BLACKROCK LIQUIDITY FEDFUND  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] brlf3_SupplementTextBlock

BLACKROCK LIQUIDITY FUNDS

FedFund

(the “Fund”)

Supplement dated June 20, 2016 to the

Cash Plus Shares

Prospectus of the Fund, dated February 29, 2016

Effective as of July 1, 2016, BlackRock Advisors, LLC (“BlackRock”) has contractually agreed to cap certain expenses of the Fund at a lower level. To achieve this expense cap, BlackRock has agreed to waive fees and/or reimburse ordinary operating expenses in order to keep combined Management Fees and Miscellaneous/Other Expenses, excluding certain expenses described in the prospectus, from exceeding a certain limit. Accordingly, effective as of July 1, 2016, the Fund’s prospectus is amended as follows:

The section of the prospectus entitled “Fund Overview—Key Facts About FedFund—Fees and Expenses of the Fund” is deleted in its entirety and replaced with the following:

Fees and Expenses of the Fund

 

This table describes the fees and expenses that you may pay if you buy and hold Cash Plus Shares of FedFund.

 

Annual Fund Operating Expenses
(expenses that you pay each year as a percentage of
the value of your investment)		           Cash Plus
Shares*		  
Management Fee
              0.20 % 
Distribution (12b-1) Fees
              0.35 % 
Other Expenses
              0.51 % 
Shareholder Servicing Fees
      0.50 %         
Miscellaneous/Other Expenses
      0.01 %         
Total Annual Fund Operating Expenses
              1.06 % 
Fee Waivers and/or Expense Reimbursements1
              (0.04 )% 
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements1
              1.02 % 

 

* Fund currently active, but no assets in share class as of the fiscal year ended October 31, 2015.

 

1  As described in the “Management of the Funds” section of the Fund’s prospectus beginning on page 43, BlackRock Advisors, LLC (“BlackRock”), the Fund’s investment manager, has contractually agreed to waive fees and/or reimburse ordinary operating expenses in order to keep combined Management Fees and Miscellaneous/Other Expenses from exceeding 0.17% of average daily net assets through February 28, 2018. The agreement may be terminated upon 90 days’ notice by a majority of the non-interested trustees of the Trust or by a vote of a majority of the outstanding voting securities of the Fund.

Example:

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:

 

        1 Year        3 Years        5 Years        10 Years  
Cash Plus Shares
      $ 104         $ 333         $ 581         $ 1,291   
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that you may pay if you buy and hold Cash Plus Shares of FedFund.
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses
(expenses that you pay each year as a percentage of
the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2018
Expense Example [Heading] rr_ExpenseExampleHeading Example:
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock 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:
BLACKROCK LIQUIDITY FEDFUND | Cash Plus Shares  
Risk/Return: rr_RiskReturnAbstract  
Management Fee rr_ManagementFeesOverAssets 0.20% [1]
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35% [1]
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.50% [1]
Miscellaneous/Other Expenses rr_Component2OtherExpensesOverAssets 0.01% [1]
Other Expenses rr_OtherExpensesOverAssets 0.51% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.06% [1]
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.04%) [1],[2]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 1.02% [1],[2]
1 Year rr_ExpenseExampleYear01 $ 104
3 Years rr_ExpenseExampleYear03 333
5 Years rr_ExpenseExampleYear05 581
10 Years rr_ExpenseExampleYear10 $ 1,291
[1] Fund currently active, but no assets in share class as of the fiscal year ended October 31, 2015.
[2] As described in the “Management of the Funds” section of the Fund’s prospectus beginning on page 43, BlackRock Advisors, LLC (“BlackRock”), the Fund’s investment manager, has contractually agreed to waive fees and/or reimburse ordinary operating expenses in order to keep combined Management Fees and Miscellaneous/Other Expenses from exceeding 0.17% of average daily net assets through February 28, 2018. The agreement may be terminated upon 90 days’ notice by a majority of the non-interested trustees of the Trust or by a vote of a majority of the outstanding voting securities of the Fund.