-----BEGIN PRIVACY-ENHANCED MESSAGE----- Proc-Type: 2001,MIC-CLEAR Originator-Name: webmaster@www.sec.gov Originator-Key-Asymmetric: MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB MIC-Info: RSA-MD5,RSA, E1PLaboDYOKNJ41E0BersN6HMUggU/Ti5oBNygbBZFNpMCn6rJT/R7tb/voUJ8WB cuPXAuP9uL/ugVLnEIiQbw== 0001193125-11-038056.txt : 20110217 0001193125-11-038056.hdr.sgml : 20110217 20110216184327 ACCESSION NUMBER: 0001193125-11-038056 CONFORMED SUBMISSION TYPE: 485BPOS PUBLIC DOCUMENT COUNT: 7 FILED AS OF DATE: 20110217 DATE AS OF CHANGE: 20110216 EFFECTIVENESS DATE: 20110217 FILER: COMPANY DATA: COMPANY CONFORMED NAME: BLACKROCK BOND FUND, INC. CENTRAL INDEX KEY: 0000276463 IRS NUMBER: 132949519 STATE OF INCORPORATION: MD FISCAL YEAR END: 0930 FILING VALUES: FORM TYPE: 485BPOS SEC ACT: 1933 Act SEC FILE NUMBER: 002-62329 FILM NUMBER: 11618883 BUSINESS ADDRESS: STREET 1: 100 BELLEVUE PARKWAY CITY: WILMINGTON STATE: DE ZIP: 19809 BUSINESS PHONE: 800-441-7762 MAIL ADDRESS: STREET 1: 100 BELLEVUE PARKWAY CITY: WILMINGTON STATE: DE ZIP: 19809 FORMER COMPANY: FORMER CONFORMED NAME: MERRILL LYNCH BOND FUND INC DATE OF NAME CHANGE: 20030804 FORMER COMPANY: FORMER CONFORMED NAME: MERRILL LYNCH CORPORATE BOND FUND INC/NY DATE OF NAME CHANGE: 19920703 FORMER COMPANY: FORMER CONFORMED NAME: MERRILL LYNCH HIGH INCOME FUND INC - CORRECTED NAME CHANGE DATE OF NAME CHANGE: 19600201 FILER: COMPANY DATA: COMPANY CONFORMED NAME: BLACKROCK BOND FUND, INC. CENTRAL INDEX KEY: 0000276463 IRS NUMBER: 132949519 STATE OF INCORPORATION: MD FISCAL YEAR END: 0930 FILING VALUES: FORM TYPE: 485BPOS SEC ACT: 1940 Act SEC FILE NUMBER: 811-02857 FILM NUMBER: 11618884 BUSINESS ADDRESS: STREET 1: 100 BELLEVUE PARKWAY CITY: WILMINGTON STATE: DE ZIP: 19809 BUSINESS PHONE: 800-441-7762 MAIL ADDRESS: STREET 1: 100 BELLEVUE PARKWAY CITY: WILMINGTON STATE: DE ZIP: 19809 FORMER COMPANY: FORMER CONFORMED NAME: MERRILL LYNCH BOND FUND INC DATE OF NAME CHANGE: 20030804 FORMER COMPANY: FORMER CONFORMED NAME: MERRILL LYNCH CORPORATE BOND FUND INC/NY DATE OF NAME CHANGE: 19920703 FORMER COMPANY: FORMER CONFORMED NAME: MERRILL LYNCH HIGH INCOME FUND INC - CORRECTED NAME CHANGE DATE OF NAME CHANGE: 19600201 0000276463 S000004071 BlackRock Total Return Fund C000011387 Investor A C000011388 Investor B C000011389 Investor C1 C000011390 Institutional C000011391 Class R C000037618 Investor A1 C000037619 Investor B1 C000037620 Investor C C000037621 Investor C2 C000052629 Investor B2 C000052630 Service C000052631 BlackRock 0000276463 S000004072 BlackRock High Income Fund C000011392 Investor A C000011393 Investor B C000011394 Investor C1 C000011395 Institutional C000037622 Investor C 485BPOS 1 d485bpos.htm BLACKROCK BOND FUND INC BLACKROCK BOND FUND INC

As filed with the U.S. Securities and Exchange Commission on February 16, 2011

Securities Act File No. 2-62329

Investment Company Act File No. 811-02857

 

 

 

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

 

 

FORM N-1A

REGISTRATION STATEMENT

UNDER

   THE SECURITIES ACT OF 1933    x
   Pre-Effective Amendment No.    ¨
   Post-Effective Amendment No. 47    x

and/or

REGISTRATION STATEMENT

UNDER

   THE INVESTMENT COMPANY ACT OF 1940    x

Amendment No. 43

(Check appropriate box or boxes)

 

 

BlackRock Bond Fund, Inc.

(Exact Name of Registrant as Specified in Charter)

 

 

100 Bellevue Parkway

Wilmington, Delaware 19809

(Address of Principal Executive Office)

 

 

Registrant’s Telephone Number, including Area Code (800) 441-7762

John M. Perlowski

BlackRock Bond Fund, Inc.

55 East 52nd Street, New York, New York 10055

(Name and Address of Agent for Service)

 

 

Copies to:

 

Counsel for the Fund:

Margery K. Neale, Esq.

Willkie Farr & Gallagher LLP

787 Seventh Avenue

New York, New York 10019-6009

  

Ira P. Shapiro, Esq.

BlackRock Advisors, LLC

55 East 52nd Street

New York, New York 10055

 

Continuous

(Approximate Date of Proposed Offering)

It is proposed that this filing will become effective:

  x immediately upon filing pursuant to paragraph (b)
  ¨ on          pursuant to paragraph (b)
  ¨ 60 days after filing pursuant to paragraph (a)(1)
  ¨ on          pursuant to paragraph (a)(1)
  ¨ 75 days after filing pursuant to paragraph (a)(2)
  ¨ on          pursuant to paragraph (a)(2) of Rule 485.

If appropriate, check the following box:

  ¨ This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

Title of Securities Being Registered: Shares of Common Stock, par value, $.10 per share.

 

 

 

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets all the requirements for the effectiveness of this Registration Statement under Rule 485(b) under the Securities Act and it has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of New York, and the State of New York on the 16th day of February, 2011.

 

  BLACKROCK BOND FUND, INC.
 

(Registrant)

  on behalf of BlackRock High Income Fund and BlackRock Total Return Fund
By:  

/s/ JOHN M. PERLOWSKI

  (John M. Perlowski,
  President and Chief Executive Officer)

Pursuant to the requirements of the Securities Act of 1933, this Post-Effective Amendment to the Registration Statement has been signed below by the following persons in the capacities and on the dates indicated:

 

Signature

   

Title

  

Date

/S/ JOHN M. PERLOWSKI

John M. Perlowski

   

President and Chief Executive Officer (Principal Executive Officer)

   February 16, 2011

/S/ NEAL J. ANDREWS

Neal J. Andrews

   

Chief Financial Officer (Principal Financial and Accounting Officer)

   February 16, 2011

JAMES H. BODURTHA*

(James H. Bodurtha)

   

Director

  

BRUCE R. BOND*

(Bruce R. Bond)

   

Director

  

DONALD W. BURTON*

(Donald W. Burton)

   

Director

  

STUART E. EIZENSTAT*

(Stuart E. Eizenstat)

   

Director

  

KENNETH A. FROOT*

(Kenneth A. Froot)

   

Director

  

ROBERT M. HERNANDEZ*

(Robert M. Hernandez)

   

Director

  

 

- 3 -

JOHN F. O’BRIEN*

(John F. O’Brien)

   

Director

  

ROBERTA COOPER RAMO*

(Roberta Cooper Ramo)

   

Director

  

DAVID H. WALSH*

(David H. Walsh)

   

Director

  

FRED G. WEISS*

(Fred G. Weiss)

   

Director

  

RICHARD S. DAVIS*

(Richard S. Davis)

   

Director

  

LAURENCE D. FINK*

(Laurence D. Fink)

   

Director

  

HENRY GABBAY*

(Henry Gabbay)

   

Director

  

 

*By:  

/s/ BEN ARCHIBALD

     February 16, 2011
  Ben Archibald (Attorney-in-Fact)    

 

- 4 -

SIGNATURES

Master Bond LLC has duly caused this Registration Statement of BlackRock Bond Fund, Inc. to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of New York, and State of New York, on the 16th day of February, 2011.

 

  MASTER BOND LLC
 

(Registrant)

By:  

/s/ JOHN M. PERLOWSKI

  (John M. Perlowski,
  President and Chief Executive Officer)

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed below by the following persons in the capacities and on the dates indicated.

 

Signature

   

Title

  

Date

/S/ JOHN M. PERLOWSKI

John M. Perlowski

   

President and Chief Executive Officer (Principal Executive Officer)

   February 16, 2011

/S/ NEAL J. ANDREWS

Neal J. Andrews

   

Chief Financial Officer (Principal Financial and Accounting Officer)

   February 16, 2011

JAMES H. BODURTHA*

(James H. Bodurtha)

   

Director

  

BRUCE R. BOND*

(Bruce R. Bond)

   

Director

  

DONALD W. BURTON*

(Donald W. Burton)

   

Director

  

STUART E. EIZENSTAT*

(Stuart E. Eizenstat)

   

Director

  

KENNETH A. FROOT*

(Kenneth A. Froot)

   

Director

  

ROBERT M. HERNANDEZ*

(Robert M. Hernandez)

   

Director

  

 

- 5 -

JOHN F. O’BRIEN*

(John F. O’Brien)

   

Director

  

ROBERTA COOPER RAMO*

(Roberta Cooper Ramo)

   

Director

  

DAVID H. WALSH*

(David H. Walsh)

   

Director

  

FRED G. WEISS*

(Fred G. Weiss)

   

Director

  

RICHARD S. DAVIS*

(Richard S. Davis)

   

Director

  

LAURENCE D. FINK*

(Laurence D. Fink)

   

Director

  

HENRY GABBAY*

(Henry Gabbay)

   

Director

  

 

*By:  

/s/ BEN ARCHIBALD

     February 16, 2011
  Ben Archibald (Attorney-in-Fact)    

 

- 6 -

EXHIBIT INDEX

 

Index No.

   

Description of Exhibit

EX-101.INS    XBRL Instance Document
EX-101.SCH    XBRL Taxonomy Extension Schema Document
EX-101.CAL    XBRL Taxonomy Extension Calculation Linkbase
EX-101.DEF    XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB    XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE    XBRL Taxonomy Extension Presentation Linkbase

 

- 7 -

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cik000276463_ServiceMember column dei_LegalEntityAxis compact cik000276463_S000004072Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div> -0.0008 -0.0083 0.0904 0.0857 -0.0282 0.0797 0.0834 -0.0337 0.047 0.0424 0.3208 0.0367 0.0421 0.3134 0.0452 0.0406 0.1166 0.0349 0.0395 0.1102 0.0252 0.0207 0.0112 0.0152 0.0203 0.0054 0.0425 0.0379 0.1236 0.0322 0.0368 0.1171 0.0526 0.0477 0.0182 0.042 0.0482 0.012 -0.111 -0.1152 -0.322 -0.1204 -0.1141 -0.3243 0.1636 0.1584 0.5687 0.1517 0.1595 0.5532 0.1014 0.097 0.1875 0.0911 0.0975 0.1799 2001-12-07 2001-12-07 2001-12-07 2001-12-07 2001-12-07 2001-12-07 2001-12-07 2001-12-07 2001-12-07 2001-12-07 2001-12-07 2001-12-07 2001-12-07 2001-12-07 2001-12-07 2001-12-07 2001-12-07 2001-12-07 2001-12-07 2001-12-07 0.0561 0.0491 0.0561 0.0398 0.0387 0.0476 0.042 0.0374 0.0561 0.0387 0.0449 0.0416 0.0414 0.0401 0.0561 0.0443 0.0309 0.0307 0.0233 0.0221 0.0229 0.0217 0.0344 0.0377 0.0654 0.1014 0.0654 0.0531 0.0505 0.1003 0.094 0.081 0.1494 0.14 0.1403 0.193 0.1687 0.0654 0.0811 0.0894 0.0841 0.0833 0.0536 0.0654 0.0975 0.1494 0.1699 0.0656 0.0843 0.0343 0.0382 0.0894 0.1094 0.0525 0.0677 0.0631 0.0818 0.109 0.1408 0.058 0.0457 0.058 0.0326 0.0314 0.0442 0.0386 0.0344 0.089 0.0676 0.0671 0.0788 0.0651 0.058 0.0352 0.0405 0.0378 0.0374 0.0365 0.058 0.0414 0.089 0.0696 0.0278 0.027 0.0173 0.0151 0.0388 0.0373 0.0204 0.0191 0.0283 0.0295 0.0421 0.0415 0.0901 0.0722 0.0707 0.0792 0.067 0.0901 0.07 0.0414 0.0402 0.0411 0.0402 <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><i><strong>Performance Information</strong></i></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 12pt;" class="_mt"><strong><em>Performance Information</em></strong> </font></font></font></font></font></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><i><strong>Performance Information</strong></i></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><i><strong>Performance Information</strong></i></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><i><strong>Performance Information</strong></i></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><i><strong>Performance Information</strong></i></font></p></div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">During the period shown in the bar chart, the&nbsp;<font class="_mt">highest return</font> for a quarter was&nbsp;<font class="_mt">7.13%</font> (quarter ended September 30, 2009) and the&nbsp;<font class="_mt">lowest return</font> for a quarter was&nbsp;<font class="_mt">-6.85%</font> (quarter ended September 30, 2008).</font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">During the period shown in the bar chart, the&nbsp;<font class="_mt">highest return</font> for a quarter was&nbsp;<font class="_mt">7.12%</font> (quarter ended September 30, 2009) and the <font class="_mt">lowest return </font>for a quarter was&nbsp;<font class="_mt">-6.97%</font> (quarter ended September 30, 2008).</font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">During the ten-year period shown in the bar chart, the&nbsp;<font class="_mt">highest return</font> for a quarter was&nbsp;<font class="_mt">20.39%</font> (quarter ended June 30, 2009) and the&nbsp;<font class="_mt">lowest return</font> for a quarter was&nbsp;<font class="_mt">-23.78%</font> (quarter ended December 31, 2008).</font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">During the period shown in the bar chart, the&nbsp;<font class="_mt">highest return</font> for a quarter was&nbsp;<font class="_mt">6.86%</font> (quarter ended September 30, 2009) and the&nbsp;<font class="_mt">lowest return</font> for a quarter was&nbsp;<font class="_mt">-7.03%</font> (quarter ended September 30, 2008).</font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">During the period shown in the bar chart, the&nbsp;<font class="_mt">highest return</font> for a quarter was&nbsp;<font class="_mt">7.15%</font> (quarter ended September 30, 2009) and the&nbsp;<font class="_mt">lowest return</font> for a quarter was&nbsp;<font class="_mt">-6.93%</font> (quarter ended September 30, 2008).</font></p></div> </div> <div> <div class="MetaData"> <p><font style="font-size: 10pt;" class="_mt">During the ten-year period shown in the bar chart, the&nbsp;<font class="_mt">highest return</font> for a quarter was&nbsp;<font class="_mt">20.19%</font> (quarter ended June 30, 2009) and the&nbsp;<font class="_mt">lowest return</font> for a quarter was&nbsp;<font class="_mt">-23.67%</font> (quarter ended December 31, 2008).</font></p></div> </div> Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. <font class="_mt">Sales charges are not reflected in the bar chart.</font> If they were, returns would be less than those shown. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. <div class="MetaData"> <p align="center"><font style="font-size: 11pt;" class="_mt"><b>BlackRock Shares<br />ANNUAL TOTAL RETURNS<br />BlackRock Total Return Fund<br />As of 12/31</b></font></p></div> <div class="MetaData"> <p align="center"><font style="font-size: 11pt;" class="_mt"><b>Investor A Shares<br />ANNUAL TOTAL RETURNS<br />BlackRock Total Return Fund<br />As of 12/31</b></font></p></div> <div class="MetaData"> <p align="center"><font style="font-size: 11pt;" class="_mt"><b>Investor A Shares<br />ANNUAL TOTAL RETURNS<br />BlackRock High Income Fund<br />As of 12/31</b></font></p></div> <div class="MetaData"> <p align="center"><font style="font-size: 11pt;" class="_mt"><b>Investor C1 Shares<br />ANNUAL TOTAL RETURNS<br />BlackRock Total Return Fund<br />As of 12/31</b></font></p></div> <div class="MetaData"> <p align="center"><font style="font-size: 11pt;" class="_mt"><b>Service Shares<br />ANNUAL TOTAL RETURNS<br />BlackRock Total Return Fund<br />As of 12/31</b></font></p></div> <div class="MetaData"> <p align="center"><font style="font-size: 11pt;" class="_mt"><b>Investor C1 Shares<br />ANNUAL TOTAL RETURNS<br />BlackRock High Income Fund<br />As of 12/31</b></font></p></div> 0.0713 0.0712 0.2039 0.0686 0.0715 0.2019 2009-09-30 2009-09-30 2009-06-30 2009-09-30 2009-09-30 2009-06-30 -0.0685 -0.0697 -0.2378 -0.0703 -0.0693 -0.2367 2008-09-30 2008-09-30 2008-12-31 2008-09-30 2008-09-30 2008-12-31 <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualTotalReturnsBarChartBlackrockTotalReturnFundBlackrock column period compact * column primary compact * row dei_DocumentInformationDocumentAxis compact cik000276463_BlackrockMember row dei_LegalEntityAxis compact cik000276463_S000004071Member row rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div> <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualTotalReturnsBarChartBlackrockTotalReturnFundInvIns column period compact * column primary compact * row dei_DocumentInformationDocumentAxis compact cik000276463_InvInsMember row dei_LegalEntityAxis compact cik000276463_S000004071Member row rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div> <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualTotalReturnsBarChartBlackrockHighIncomeFundInvIns column period compact * column primary compact * row dei_DocumentInformationDocumentAxis compact cik000276463_InvInsMember row dei_LegalEntityAxis compact cik000276463_S000004072Member row rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div> <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualTotalReturnsBarChartBlackrockTotalReturnFundPrime column period compact * column primary compact * row dei_DocumentInformationDocumentAxis compact cik000276463_PrimeMember row dei_LegalEntityAxis compact cik000276463_S000004071Member row rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div> <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualTotalReturnsBarChartBlackrockTotalReturnFundService column period compact * column primary compact * row dei_DocumentInformationDocumentAxis compact cik000276463_ServiceMember row dei_LegalEntityAxis compact cik000276463_S000004071Member row rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div> <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualTotalReturnsBarChartBlackrockHighIncomeFundService column period compact * column primary compact * row dei_DocumentInformationDocumentAxis compact cik000276463_ServiceMember row dei_LegalEntityAxis compact cik000276463_S000004072Member row rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div> 0.0046 0.0046 0.0046 0.0046 0.0046 0.0046 0.0001 0.0001 0.0001 0.0001 0.0046 0.0046 0.0046 0.0046 0.0046 0.0046 0.0001 0.0027 0.0043 0.0024 0.0038 0.0034 0.0025 0.0037 0.0027 0.0049 0.003 0.0027 0.0038 0.004 0.0043 0.0025 0.0036 0.0009 0 0.0025 0.0075 0 0.005 0.01 0.0025 0.0075 0 0.01 0.008 0.001 0.005 0.005 0.01 0.0025 0.008 You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least <font class="_mt">$25,000 </font>in the BlackRock-advised fund complex. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least&nbsp;<font class="_mt">$25,000</font> in the BlackRock-advised fund complex. 25000 25000 <div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font style="font-size: 11pt;" class="_mt"><b>Example:</b></font></p></div> <font style="font-size: 11pt;" class="_mt"><strong>Example:</strong></font> <div class="MetaData"> <p align="left"><font style="font-size: 11pt;" class="_mt"><b>Example:</b></font></p></div> <div class="MetaData"><font style="font-size: 11pt;" class="_mt"><b>Example:</b></font></div> <div class="MetaData"> <p align="left"><font style="font-size: 11pt;" class="_mt"><strong>Example:</strong></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 11pt;" class="_mt"><b>Example:</b></font></p></div> <div> <div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;" align="left"><font style="font-size: 10pt;" class="_mt">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:</font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">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:</font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">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:</font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font class="_mt"><font style="font-size: 10pt;" class="_mt">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% </font><font style="font-size: 10pt;" class="_mt">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:</font></font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">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:</font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">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:</font></p></div> </div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">You would pay the following expenses if you did not redeem your shares:</font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">You would pay the following expenses if you did not redeem your shares:</font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">You would pay the following expenses if you did not redeem your shares:</font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">You would pay the following expenses if you did not redeem your shares:</font></p></div> <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleNoRedemptionTransposedBlackrockTotalReturnFundInvIns row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_InvInsMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div> <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleNoRedemptionTransposedBlackrockHighIncomeFundInvIns row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_InvInsMember column dei_LegalEntityAxis compact cik000276463_S000004072Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div> <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleNoRedemptionTransposedBlackrockTotalReturnFundPrime row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_PrimeMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div> <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleNoRedemptionTransposedBlackrockHighIncomeFundService row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_ServiceMember column dei_LegalEntityAxis compact cik000276463_S000004072Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div> 204 214 158 195 196 174 176 214 162 630 673 490 603 606 539 545 692 502 1083 1159 845 1037 1042 928 939 1196 866 2338 2499 1845 2243 2254 2019 2041 2246 1889 <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockTotalReturnFundBlackrock row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_BlackrockMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div> <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockTotalReturnFundInvIns row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_InvInsMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div> <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockHighIncomeFundInvIns row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_InvInsMember column dei_LegalEntityAxis compact cik000276463_S000004072Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div> <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockTotalReturnFundPrime row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_PrimeMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div> <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockTotalReturnFundService row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_ServiceMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div> <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockHighIncomeFundService row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_ServiceMember column dei_LegalEntityAxis compact cik000276463_S000004072Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div> 88 532 604 103 159 314 491 558 72 295 296 221 274 276 664 133 262 287 811 930 334 524 673 685 790 224 603 606 477 564 545 1042 419 502 503 1110 1283 584 914 1159 894 1045 390 1037 1042 753 928 939 1396 727 866 1126 1959 2338 1300 2007 2449 1497 1845 871 2243 2254 1540 2019 2041 2246 1600 1889 <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><i><strong>Fees and Expenses of the Fund</strong></i></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Fees and Expenses of the Fund</i></b></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Fees and Expenses of the Fund</i></b></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><i><strong>Fees and Expenses of the Fund</strong></i></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Fees and Expenses of the Fund</i></b></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Fees and Expenses of the Fund</i></b></font></p></div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">This table describes the fees and expenses that you may pay if you buy and hold BlackRock Shares of the Fund.</font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.&nbsp;<font class="_mt">You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least <font class="_mt">$25,000 </font>in the BlackRock-advised fund complex.</font> More information about these and other discounts is available from your financial professional and in the "Details about the Share Classes" section on page 27 of the Fund's prospectus and in the "Purchase of Shares" section on page II-67 of the Fund's statement of additional information.</font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.&nbsp;<font class="_mt">You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least&nbsp;<font class="_mt">$25,000</font> in the BlackRock-advised fund complex.</font> More information about these and other discounts is available from your financial professional and in the "Details about the Share Classes" section on page 27 of the Fund's prospectus and in the "Purchase of Shares" section on page II-67 of the Fund's statement of additional information.</font></p></div> </div> <div> <div class="MetaData"><font style="font-size: 10pt;" class="_mt">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.</font></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">This table describes the fees and expenses that you may pay if you buy and hold Service Shares of the Fund.</font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">This table describes the fees and expenses that you may pay if you buy and hold Investor C1 Shares of the Fund.</font></p></div> </div> 0.0099 0.0142 0.0208 0.0114 0.0178 0.0224 0.0093 0.0155 0.007 0.0192 0.02 0.0127 0.0178 0.018 0.0233 0.014 0.0159 The Total Annual Fund Operating Expenses have been restated to reflect as if the distribution fees had been paid -0.0013 -0.0007 -0.0007 -0.0013 -0.0022 -0.0013 -0.0007 -0.0007 -0.0007 -0.0007 -0.0022 -0.0009 February 1, 2012 February 1, 2012 February 1, 2012 February 1, 2012 highest return highest return highest return highest return highest return highest return lowest return lowest return lowest return lowest return lowest return lowest return 0.0044 0.0044 0.0044 0.0044 0.0044 0.0044 0.0042 0.0042 0.0042 0.0042 0.0044 0.0044 0.0044 0.0044 0.0044 0.0044 0.0042 0 0 0.04 0 0 0.01 0 0.04 0 0.01 0.01 0 0.01 0.01 0.045 0 0.01 0 0.04 0 0 0 0 0.04 0 0 0 0 0.01 0 0 0 0 0 0.0086 0.0135 0.0201 0.0101 0.0156 0.0211 0.0193 0.012 0.0171 0.0173 0.0211 0.0131 <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b>Investment Objective</b></font></p></div> <div><font class="_mt"> </font> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Investment Objective</i></b></font></p><font class="_mt"> </font></div> <em><strong><font style="font-size: 12pt;" class="_mt">Investment Objective</font></strong></em> <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Investment Objective</i></b></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Investment Objective</i></b></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Investment Objective</i></b></font></p></div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The investment objective of the BlackRock Total Return Fund (the "Fund") is to realize a total return that exceeds that of the Barclays Capital U.S. Aggregate Bond Index.</font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The investment objective of the BlackRock Total Return Fund (the "Total Return Fund" or the "Fund") is to realize a total return that exceeds that of the Barclays Capital U.S. Aggregate Bond Index.</font></p></div> </div> <div> <font style="font-size: 10pt;" class="_mt">The primary investment objective of the BlackRock High Income Fund (the "High Income Fund" or the "Fund") is to provide shareholders with as high a level of current income as is consistent with the investment policies of such Fund. </font> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The investment objective of the BlackRock Total Return Fund (the "Total Return Fund" or the "Fund") is to realize a total return that exceeds that of the Barclays Capital U.S. Aggregate Bond Index.</font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The investment objective of the BlackRock Total Return Fund (the "Fund") is to realize a total return that exceeds that of the Barclays Capital U.S. Aggregate Bond Index.</font></p></div> </div> <div> <font style="font-size: 10pt;" class="_mt">The primary investment objective of the BlackRock High Income Fund (the "High Income Fund" or the "Fund") is to provide shareholders with as high a level of current income as is consistent with the investment policies of such Fund. </font> </div> <div> As a secondary objective, the High Income Fund seeks capital appreciation when consistent with its primary objective. </div> <div> As a secondary objective, the High Income Fund seeks capital appreciation when consistent with its primary objective. </div> <div class="MetaData"><strong><font size="2" class="_mt">Annual Fund Operating Expenses<br />(expenses that you pay each year as a percentage of the value of your investment)</font></strong></div> <div class="MetaData"><font style="line-height: 115%; font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt"><strong>Annual Fund Operating Expenses<br />(expenses that you pay each year as a <br />percentage of the value of your investment)</strong></font></div> <div class="MetaData"><strong> </strong> <table border="0" cellspacing="0" cellpadding="0" width="100%"> <tr><td> <p style="margin-top: 0px; margin-bottom: 0px;"><strong><font class="_mt" size="2">Annual Fund Operating Expenses<br /></font><font style="font-size: 9pt;" class="_mt">(expenses that you pay each year as </font></strong></p> <p style="margin-top: 0px; margin-bottom: 0px;"><strong><font style="font-size: 9pt;" class="_mt">a percentage of the value of your investment)</font></strong></p></td></tr></table></div> <div class="MetaData"> <p style="line-height: normal; margin: 0in 0in 0pt; font-family: 'Calibri','sans-serif'; font-size: 11pt;" class="MsoNormal"><b><font style="font-family: 'Arial','sans-serif'; font-size: 10pt;" class="_mt">Annual Fund Operating Expenses<br /></font></b><b><font style="font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">(expenses that you pay each year as a <br />percentage of the value of your investment)</font></b></p></div> <strong><font size="2" class="_mt">Annual Fund Operating Expenses<br />(expenses that you pay each year as a percentage of the value of your investment)</font></strong> <div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font class="_mt"><strong><font size="2" class="_mt">Annual Fund Operating Expenses<br /></font><font style="font-size: 9pt;" class="_mt">(expenses that you pay each year as a percentage of the value of your investment)</font></strong> </font></p></div> 0.0055 0.0073 0.0089 0.007 0.0084 0.008 0.0026 0.0038 0.0028 0.005 0.0076 0.0073 0.0084 0.0086 0.0089 0.0071 0.0037 800-882-0052. <font style="font-size: 10pt;" class="_mt">800-882-0052.</font> 800-882-0052 <font style="font-size: 10pt;" class="_mt">800-882-0052.</font> <font style="font-size: 10pt;" class="_mt">800-882-0052.</font> 800-882-0052 http://www.blackrock.com/funds http://www.blackrock.com/funds http://www.blackrock.com/funds http://www.blackrock.com/funds http://www.blackrock.com/funds http://www.blackrock.com/funds <font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font> <font style="font-size: 12pt;" class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font></font></font></font> <font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font> <font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font> <font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font> <font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font></font>The table compares the Fund's performance to that of the Barclays Capital U.S. Aggregate Bond Index. Effective September 24, 2007, the Total Return Fund reorganized with BlackRock Total Return Portfolio (the "Predecessor Fund"), a series of BlackRock Funds II (the "Reorganization"), and the Predecessor Fund's performance and financial history has been adopted by the Total Return Fund and will be used going forward from the date of the Reorganization. The information below is based on the performance information of the combined fund resulting from the Reorganization and that of the Predecessor Fund prior to the Reorganization. Prior the September 24, 2007, BlackRock Share performance results are thos e of BlackRock Shares of the Predecessor Fund with no adjustments.&nbsp;<font class="_mt">As with all such investments, past performance (before and after taxes) is not an indication of future results.</font>&nbsp;<font class="_mt">Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.</font>&nbsp;<font class="_mt">However, the table includes all applicable fees and sales charges.</font> If the Fund's investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund's returns would have been lower. Updated information on the Fund's performance can be obtained by visiting&nbsp;<font class="_mt">http://www.blackrock.com/funds</font> or can be obtained by phone at&nbsp;<font class="_mt">800-882-0052.</font> </font></p></div> </div> <div> <div class="MetaData"><font style="font-size: 12pt;" class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 12pt;" class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font></font></font></font></font>The table compares the Fund's performance to that of the Barclays Capital U.S. Aggregate Bond Index. Effective September 24, 2007, the Total Return Fund reorganized with BlackRock Total Return Portfolio (the "Predecessor Fund"), a series of BlackRock Funds II (the "Reorganization"), and the Predecessor Fund's performance and financial history has been adopted by the Total Return Fund and will be used going forward from the date of the Reorganization. The information below is based on the performance information of the combined fund resulting from the Reorganization and that of the Predecessor Fund prior to the Reorganization (adjusted as necessary to reflect the fees applicable to each class of shares). Prior to September 24, 2007, Investor A, Investor B and Institutional Share performance results are those of BlackRock Shares of the Predecessor Fund restated to reflect Investor A, Investor B and Institutional Share fees, respectively. Prior to September 24, 2007, Investor C Share performance results are those of Investor C Shares of a predecessor fund with no adjustments. Prior to October 2, 2006, Class R Share performance results are those of the Class R Shares of the Predecessor Fund. Prior to the Predecessor Fund Class R Shares inception date, the Class R Share performance is based on the performance of the BlackRock Shares of the Predecessor Fund restated to reflect Class R Share fees.&nbs p;<font class="_mt">As with all such investments, past performance (before and after taxes) is not an indication of future results.</font>&nbsp;<font class="_mt">Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.</font>&nbsp;<font class="_mt">However, the table includes all applicable fees and sales charges.</font> If the Fund's investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund's returns would have been lower. Updated information on the Fund's performance can be obtained by visiting&nbsp;<font class="_mt">http://www.blackrock.com/funds</font> or can be obtained by phone at <font class="_mt"><font style="font-size: 10pt;" class="_mt">800-882-0052.</font></font></font> </font> <p>&nbsp;</p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font></font>The table compares the Fund's performance to that of the Barclays Capital U.S. Corporate High Yield 2% Issuer Capped Index. Prior to October 2, 2006, Investor C Share performance results are those of Institutional Shares (which have no distribution or service fees) restated to reflect Investor C Share fees.&nbsp;<font class="_mt">As with all such investments, past performance (before and after taxes) is not an indication of future results.</font>&nbsp;<font class="_mt">Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.</font>&nbsp;<font class="_mt">However, the table includes all applicable fees and sales charges.</font> If the Fund's investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund's returns would have been lower. Updated information on the Fund's performance can be obtained by visiting&nbsp;<font class="_mt">http://www.blackrock.com/funds</font> or can be obtained by phone at <font class="_mt">800-882-0052</font>. </font><font style="font-size: 10pt;" class="_mt"> </font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font></font>The table compares the Fund's performance to that of the Barclays Capital U.S. Aggregate Bond Index. Effective September 24, 2007, the Total Return Fund reorganized with BlackRock Total Return Portfolio (the "Predecessor Fund"), a series of BlackRock Funds II (the "Reorganization"), and the Predecessor Fund's performance and financial history has been adopted by the Total Return Fund and will be used going forward from the date of the Reorganization. The information below is based on the performance information of the combined fund resulting from the Reorganization and that of the Predecessor Fund prior to the Reorganization (adjusted as necessary to reflect the fees applicable to each class of shar es). Prior to September 24, 2007, Investor A1, Investor B1, Investor C1 and Investor C2 Share performance results are those of BlackRock Shares of the Predecessor Fund restated to reflect Investor A1, Investor B1, Investor C1 and Investor C2 fees, respectively. Prior to September 24, 2007, Investor B2 Share performance results are those of Investor B Shares of the Predecessor Fund with no adjustments.&nbsp;<font class="_mt">As with all such investments, past performance (before and after taxes) is not an indication of future results.</font>&nbsp;<font class="_mt"><font class="_mt">Sales charges are not reflected in the bar chart.</font> If they were, returns would be less than those shown.</font>&nbsp;<font class="_mt">However, the table includes all applicable fees and sales charges.</font> If the Fund's investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund's returns would have been lower. Updated information on the Fund's performance can be obtained by visiting&nbsp;<font class="_mt">http://www.blackrock.com/funds</font> or can be obtained by phone at <font class="_mt"><font style="font-size: 10pt;" class="_mt">800-882-0052.</font></font></font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font></font>The table compares the Fund's performance to that of the Barclays Capital U.S. Aggregate Bond Index. Effective September 24, 2007, the Fund reorganized with BlackRock Total Return Portfolio (the "Predecessor Fund"), a series of BlackRock Funds II (the "Reorganization"), and the Predecessor Fund's performance and financial history has been adopted by the Fund and will be used going forward from the date of the Reorganization. The information below is based on the performance information of the combined fund resulting from the Reorganization and that of the Predecessor Fund prior to the Reorganization (adjusted as necessary to reflect the fees applicable to Service Shares of the Fund). Prior September 24, 2007, Service Share performance results are those of Investor A Shares of the Predeccessor Fund restated to reflect Service Share fees.&nbsp;<font class="_mt">As with all such investments, past performance (before and after taxes) is not an indication of future results.</font>&nbsp;<font class="_mt">Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.</font>&nbsp;<font class="_mt">However, the table includes all applicable fees and sales charges.</font> If the Fund's investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund's returns would have been lower. Updated information on the Fund's performance can be obtained by visiting&nbsp;<font class="_mt">http://www.blackrock.com/funds</font> or can be obtained by phone at <font class="_mt"><font style="font-size: 10pt;" class="_mt">800-882-0052.</font></font> </font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font></font>The table compares the Fund's performance to that of the Barclays Capital U.S. Corporate High Yield 2% Issuer Capped Index.&nbsp;<font class="_mt">As with all such investments, past performance (before and after taxes) is not an indication of future results.</font>&nbsp;<font class="_mt">Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.</font>&nbsp;<font class="_mt">However, the table includes all applicable fees and sales charges.</font> If the Fund's investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund's returns would have been low er. Updated information on the Fund's performance can be obtained by visiting&nbsp;<font class="_mt">http://www.blackrock.com/funds</font> or can be obtained by phone at <font class="_mt">800-882-0052</font>.</font></p></div> </div> As with all such investments, past performance (before and after taxes) is not an indication of future results. As with all such investments, past performance (before and after taxes) is not an indication of future results. As with all such investments, past performance (before and after taxes) is not an indication of future results. As with all such investments, past performance (before and after taxes) is not an indication of future results. As with all such investments, past performance (before and after taxes) is not an indication of future results. As with all such investments, past performance (before and after taxes) is not an indication of future results. However, the table includes all applicable fees and sales charges. However, the table includes all applicable fees and sales charges. However, the table includes all applicable fees and sales charges. However, the table includes all applicable fees and sales charges. However, the table includes all applicable fees and sales charges. However, the table includes all applicable fees and sales charges. <div class="MetaData"> <p style="font-family: 'Times New Roman','serif'; margin-left: 0in; font-size: 12pt; margin-right: 0in;"><b><font style="font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">As of 12/31/10<br />Average Annual Total Returns</font></b><b><font style="font-family: 'Arial','sans-serif'; font-size: 11pt;" class="_mt"> </font></b></p></div> <div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><b><font style="font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">As of 12/31/10<br />Average Annual Total Returns</font></b></p></div> <b><font style="line-height: 115%; font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">As of 12/31/10<br />Average Annual Total Returns </font></b> <div class="MetaData"><strong><font class="_mt"><font size="2" class="_mt">As of 12/31/10<br /></font><font style="font-size: 9pt;" class="_mt">Average Annual Total Returns</font></font></strong> </div> <div class="MetaData"> <div> <p style="font-family: 'Times New Roman','serif'; margin-left: 0in; font-size: 12pt; margin-right: 0in;"><b><font style="font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">As of 12/31/10<br />Average Annual Total Returns</font></b><b><font style="font-family: 'Arial','sans-serif'; font-size: 11pt;" class="_mt"> </font></b></p></div></div> <div class="MetaData"> <p style="text-indent: 0in; margin: 0in 0in 0pt;" class="MsoNormal"><b><font style="font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">As of 12/31/10<br />Average Annual Total Returns</font></b></p></div> <div> <div class="MetaData"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. </font></font><font class="_mt">Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.</font></font></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes.&nbsp;</font></font></font><font class="_mt">Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or IRAs.</font> </font><font class="_mt"><font class="_mt">After-tax returns are shown for Investor A Shares only, and the after-tax returns for Investor B, Investor C, Institutional and Class R Shares will vary.</font></font></font></p></div> </div> <div> <div class="MetaData"> <p style="font-family: 'Times New Roman','serif'; margin-left: 0in; font-size: 12pt; margin-right: 0in;"><font style="font-family: 'Arial','sans-serif'; font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-family: 'Arial','sans-serif'; font-size: 10pt;" class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes.&nbsp;</font></font><font class="_mt">Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts ("IRAs").</font> <font class="_mt">After-tax returns are shown for Investor A Shares only, and the after-tax returns for Investor B, Investor C and Institutional Shares will vary.</font></font></p>& lt;/div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes.&nbsp;</font></font><font class="_mt">Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or IRAs.</font> <font class="_mt">After-tax returns are shown for Investor C1 Shares only, and the after-tax returns for Investor A1, Investor B1, Investor B2 and Investor C2 Shares will vary.</font></font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. </font></font><font class="_mt">Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.</font></font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. </font></font><font class="_mt">Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.</font></font></p></div> </div> Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or IRAs. Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts ("IRAs"). Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or IRAs. Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. <font class="_mt">After-tax returns are shown for Investor A Shares only, and the after-tax returns for Investor B, Investor C, Institutional and Class R Shares will vary.</font> After-tax returns are shown for Investor A Shares only, and the after-tax returns for Investor B, Investor C and Institutional Shares will vary. After-tax returns are shown for Investor C1 Shares only, and the after-tax returns for Investor A1, Investor B1, Investor B2 and Investor C2 Shares will vary. <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAverageAnnualTotalReturnsTransposedBlackrockTotalReturnFundBlackrock row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_BlackrockMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * column rr_PerformanceMeasureAxis compact * ~&lt;/div&gt; </div> <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAverageAnnualTotalReturnsTransposedBlackrockTotalReturnFundInvIns row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_InvInsMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * column rr_PerformanceMeasureAxis compact * ~&lt;/div&gt; </div> <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAverageAnnualTotalReturnsTransposedBlackrockHighIncomeFundInvIns row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_InvInsMember column dei_LegalEntityAxis compact cik000276463_S000004072Member column rr_ProspectusShareClassAxis compact * column rr_PerformanceMeasureAxis compact * ~&lt;/div&gt; </div> <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAverageAnnualTotalReturnsTransposedBlackrockTotalReturnFundPrime row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_PrimeMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * column rr_PerformanceMeasureAxis compact * ~&lt;/div&gt; </div> <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAverageAnnualTotalReturnsTransposedBlackrockTotalReturnFundService row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_ServiceMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * column rr_PerformanceMeasureAxis compact * ~&lt;/div&gt; </div> <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAverageAnnualTotalReturnsTransposedBlackrockHighIncomeFundService row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_ServiceMember column dei_LegalEntityAxis compact cik000276463_S000004072Member column rr_ProspectusShareClassAxis compact * column rr_PerformanceMeasureAxis compact * ~&lt;/div&gt; </div> <font style="font-size: 10pt;" class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. </font> <font style="font-size: 10pt;" class="_mt"><font class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes.&nbsp;</font></font> <font style="font-family: 'Arial','sans-serif'; font-size: 10pt;" class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes.&nbsp;</font> <font style="font-size: 10pt;" class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes.&nbsp;</font> <font style="font-size: 10pt;" class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. </font> <font style="font-size: 10pt;" class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. </font> <div class="MetaData"> <p align="left"><font style="font-size: 11pt;" class="_mt"><b>Portfolio Turnover</b></font></p></div> <div class="MetaData"><font style="font-size: 11pt;" class="_mt"><strong>Portfolio Turnover</strong> </font></div> <div class="MetaData"> <p align="left"><font style="font-size: 11pt;" class="_mt"><b>Portfolio Turnover</b></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 11pt;" class="_mt"><b>Portfolio Turnover</b></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 11pt;" class="_mt"><b>Portfolio Turnover</b></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 11pt;" class="_mt"><b>Portfolio Turnover</b></font></p></div> 17.54 17.54 0.97 17.54 17.54 0.97 <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was&nbsp;<font class="_mt">1,754%</font> of the average value of its portfolio.</font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was&nbsp;<font class="_mt">1,754%</font> of the average value of its portfolio.</font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was&nbsp;<font class="_mt">97%</font> of the average value of its portfolio.</font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was&nbsp;<font class="_mt">1,754%</font> of the average value of its portfolio.</font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was&nbsp;<font class="_mt">1,754%</font> of the average value of its portfolio.</font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was&nbsp;<font class="_mt">97%</font> of the average value of its portfolio.</font></p></div> </div> 2011-01-28 -0.02 -0.02 -0.02 -0.02 -0.02 <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Risks of Investing in the Fund</i></b></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Risks of Investing in the Fund</i></b><br /><br /></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Risks of Investing in the Fund</i></b></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Risks of Investing in the Fund</i></b></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Risks of Investing in the Fund</i></b></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Risks of Investing in the Fund</i></b></font></p></div> You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments. You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments. You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments. You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments. You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments. You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments. <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time.&nbsp;<font class="_mt">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.</font> The following is a summary description of certain risks of investing in the Fund.</font></p> <ul> <li><font style="font-size: 10pt;" class="_mt"><b><i>Credit Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Credit risk refers to the possibility that the issuer of a security will not be able to make payments of interest and principal when due. Changes in an issuer's credit rating or the market's perception of an issuer's creditworthiness may also affect the value of the Fund's investment in that issuer.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Derivatives Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund's use of derivatives may reduce the Fund's returns and/or increase volatility. Volatility is defined as the characteristic of a security, an index or a market to fluctuate significantly in price within a short time period. Derivatives are also subject to counterparty risk, which is the risk that the other party in the transaction will not fulfill its contractual obligation. A risk of the Fund's use of derivatives is that the fluctuations in their values may not correlate perfectly with the overall securities markets. The possible lack of a liquid secondary market for derivatives and the resulting inability of the Fund to sell or otherwise close a derivatives position could expose the Fund to losses and could make derivatives more difficult for the Fund to value accurately. Derivatives may give rise to a form of lev erage and may expose the Fund to greater risk and increase its costs.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Dollar Rolls Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Dollar rolls involve the risk that the market value of the securities that the Fund is committed to buy may decline below the price of the securities the Fund has sold. These transactions may involve leverage.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Extension Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates rise, certain obligations will be paid off by the obligor more slowly than anticipated, causing the value of these securities to fall.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>High Portfolio Turnover Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund may engage in active and frequent trading of its portfolio securities. High portfolio turnover (more than 100%) may result in increased transaction costs to the Fund, including brokerage commissions, dealer mark-ups and other transaction costs on the sale of the securities and on reinvestment in other securities. The sale of Fund portfolio securities may result in the realization and/or distribution to shareholders of higher capital gains or losses as compared to a fund with less active trading policies. Given the frequency of sales, such gain or loss will likely be short-term capital gain or loss and, in the event of a gain, would increase an investor's tax liability unless shares are held through a tax-deferred or exempt vehicle. These effects of higher than normal portfolio turnover may adversely aff ect Fund performance. In addition, investment in mortgage dollar rolls and participation in TBA transactions may significantly increase the Fund's portfolio turnover rate. A TBA transaction is a method of trading mortgage-backed securities where the buyer and seller agree upon general trade parameters such as agency, settlement date, par amount, and price.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Interest Rate Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Interest rate risk is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall, and decrease as interest rates rise.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Foreign Securities Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212;Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include:<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Changes in foreign currency exchange rates can affect the value of the Fund's portfolio.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Settlement and clearance procedures in certain foreign markets may result in delays in payment for or delivery of securities not typically associated with settlement and clearance of U.S. investments.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Junk Bonds Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Although junk bonds generally pay higher rates of interest than investment grade bonds, junk bonds are high risk investments that may cause income and principal losses for the Fund.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Market Risk and Selection Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Mortgage- and Asset-Backed Securities Risks</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Mortgage- and asset-backed securities represent interests in "pools" of mortgages or other assets, including consumer loans or receivables held in trust. Mortgage- and asset-backed securities are subject to credit, interest rate, prepayment and extension risks. These securities also are subject to risk of default on the underlying mortgage or asset, particularly during periods of economic downturn. Small movements in interest rates (both increases and decreases) may quickly and significantly reduce the value of certain mortgage-backed securities.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Prepayment Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates fall, certain obligations will be paid off by the obligor more quickly than originally anticipated, and the Fund may have to invest the proceeds in securities with lower yields.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Sovereign Debt Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Sovereign debt instruments are subject to the risk that a governmental entity may delay or refuse to pay interest or repay principal on its sovereign debt, due, for example, to cash flow problems, insufficient foreign currency reserves, political considerations, the relative size of the governmental entity's debt position in relation to the economy or the failure to put in place economic reforms required by the International Monetary Fund or other multilateral agencies.<br /><br /></font></li></ul></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time.&nbsp;<font class="_mt">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.</font> The following is a summary description of certain risks of investing in the Fund.<br /><br /></font></p> <ul> <li><font style="font-size: 10pt;" class="_mt"><b><i>Credit Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Credit risk refers to the possibility that the issuer of a security will not be able to make payments of interest and principal when due. Changes in an issuer's credit rating or the market's perception of an issuer's creditworthiness may also affect the value of the Fund's investment in that issuer.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Derivatives Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund's use of derivatives may reduce the Fund's returns and/or increase volatility. Volatility is defined as the characteristic of a security, an index or a market to fluctuate significantly in price within a short time period. Derivatives are also subject to counterparty risk, which is the risk that the other party in the transaction will not fulfill its contractual obligation. A risk of the Fund's use of derivatives is that the fluctuations in their values may not correlate perfectly with the overall securities markets. The possible lack of a liquid secondary market for derivatives and the resulting inability of the Fund to sell or otherwise close a derivatives position could expose the Fund to losses and could make derivatives more difficult for the Fund to value accurately. Derivatives may give rise to a form of lev erage and may expose the Fund to greater risk and increase its costs.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Dollar Rolls Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Dollar rolls involve the risk that the market value of the securities that the Fund is committed to buy may decline below the price of the securities the Fund has sold. These transactions may involve leverage.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Extension Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates rise, certain obligations will be paid off by the obligor more slowly than anticipated, causing the value of these securities to fall.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Foreign Securities Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include:<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Changes in foreign currency exchange rates can affect the value of the Fund's portfolio.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Settlement and clearance procedures in certain foreign markets may result in delays in payment for or delivery of securities not typically associated with settlement and clearance of U.S. investments.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>High Portfolio Turnover Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund may engage in active and frequent trading of its portfolio securities. High portfolio turnover (more than 100%) may result in increased transaction costs to the Fund, including brokerage commissions, dealer mark-ups and other transaction costs on the sale of the securities and on reinvestment in other securities. The sale of Fund portfolio securities may result in the realization and/or distribution to shareholders of higher capital gains or losses as compared to a fund with less active trading policies. Given the frequency of sales, such gain or loss will likely be short-term capital gain or loss and, in the event of a gain, would increase an investor's tax liability unless shares are held through a tax-deferred or exempt vehicle. These effects of higher than normal portfolio turnover may adversely aff ect Fund performance. In addition, investment in mortgage dollar rolls and participation in TBA transactions may significantly increase the Fund's portfolio turnover rate. A TBA transaction is a method of trading mortgage-backed securities where the buyer and seller agree upon general trade parameters such as agency, settlement date, par amount, and price.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Interest Rate Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Interest rate risk is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall, and decrease as interest rates rise.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Junk Bonds Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Although junk bonds generally pay higher rates of interest than investment grade bonds, junk bonds are high risk investments that may cause income and principal losses for the Fund.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Market Risk and Selection Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Mortgage- and Asset-Backed Securities Risks</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Mortgage- and asset-backed securities represent interests in "pools" of mortgages or other assets, including consumer loans or receivables held in trust. Mortgage- and <font style="font-size: 10pt;" class="_mt">asset-backed securities are subject to credit, interest rate, prepayment and extension risks. These securities also are subject to risk of default on the underlying mortgage or asset, particularly during periods of economic downturn. Small movements in interest rates (both increases and decreases) may quickly and significantly reduce the value of certain mortgage-backed securities.<br /><br /></font></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Prepayment Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates fall, certain obligations will be paid off by the obligor more quickly than originally anticipated, and the Fund may have to invest the proceeds in securities with lower yields.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Sovereign Debt Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Sovereign debt instruments are subject to the risk that a governmental entity may delay or refuse to pay interest or repay principal on its sovereign debt, due, for example, to cash flow problems, insufficient foreign currency reserves, political considerations, the relative size of the governmental entity's debt position in relation to the economy or the failure to put in place economic reforms required by the International Monetary Fund or other multilateral agencies.<br /><br /></font></li></ul></div> </div> <div> <div class="MetaData"> <p class="MetaData" align="left"><font style="font-size: 10pt;" class="_mt">Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time.<font class="_mt">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.</font> The following is a summary description of certain risks of investing in the Fund.</font></p> <div> <ul> <li><font style="font-size: 10pt;" class="_mt"><b><i>Corporate Loans Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Commercial banks and other financial institutions or institutional investors make corporate loans to companies that need capital to grow or restructure. Borrowers generally pay interest on corporate loans at rates that change in response to changes in market interest rates such as the London Interbank Offered Rate ("LIBOR") or the prime rates of U.S. banks. As a result, the value of corporate loan investments is generally less exposed to the adverse effects of shifts in market interest rates than investments that pay a fixed rate of interest.<br /></font></li></ul></div> <ul> <li><font style="font-size: 10pt;" class="_mt"><b><i>Credit Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Credit risk refers to the possibility that the issuer of a security will not be able to make payments of interest and principal when due. Changes in an issuer's credit rating or the market's perception of an issuer's creditworthiness may also affect the value of the Fund's investment in that issuer.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Derivatives Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund's use of derivatives may reduce the Fund's returns and/or increase volatility. Volatility is defined as the characteristic of a security, an index or a market to fluctuate significantly in price within a short time period. Derivatives are also subject to counterparty risk, which is the risk that the other party in the transaction will not fulfill its contractual obligation. A risk of the Fund's use of derivatives is that the fluctuations in their values may not correlate perfectly with the overall securities markets. The possible lack of a liquid secondary market for derivatives and the resulting inability of the Fund to sell or otherwise close a derivatives position could expose the Fund to losses and could make derivatives more difficult for the Fund to value accurately. Derivatives may give rise to a form of lev erage and may expose the Fund to greater risk and increase its costs.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Extension Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates rise, certain obligations will be paid off by the obligor more slowly than anticipated, causing the value of these securities to fall.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Foreign Securities Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include:<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Changes in foreign currency exchange rates can affect the value of the Fund's portfolio.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Settlement and clearance procedures in certain foreign markets may result in delays in payment for or delivery of securities not typically associated with settlement and clearance of U.S. investments.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Interest Rate Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Interest rate risk is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall, and decrease as interest rates rise.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Junk Bonds Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Although junk bonds generally pay higher rates of interest than investment grade bonds, junk bonds are high risk investments that may cause income and principal losses for the Fund.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Market Risk and Selection Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Prepayment Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates fall, certain obligations will be paid off by the obligor more quickly than originally anticipated, and the Fund may have to invest the proceeds in securities with lower yields.<br /><br /></font></li></ul></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time.&nbsp;<font class="_mt">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.</font> The following is a summary description of certain risks of investing in the Fund.</font></p> <ul> <li><font style="font-size: 10pt;" class="_mt"><b><i>Credit Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Credit risk refers to the possibility that the issuer of a security will not be able to make payments of interest and principal when due. Changes in an issuer's credit rating or the market's perception of an issuer's creditworthiness may also affect the value of the Fund's investment in that issuer.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Derivatives Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund's use of derivatives may reduce the Fund's returns and/or increase volatility. Volatility is defined as the characteristic of a security, an index or a market to fluctuate significantly in price within a short time period. Derivatives are also subject to counterparty risk, which is the risk that the other party in the transaction will not fulfill its contractual obligation. A risk of the Fund's use of derivatives is that the fluctuations in their values may not correlate perfectly with the overall securities markets. The possible lack of a liquid secondary market for derivatives and the resulting inability of the Fund to sell or otherwise close a derivatives position could expose the Fund to losses and could make derivatives more difficult for the Fund to value accurately. Derivatives may give rise to a form of lev erage and may expose the Fund to greater risk and increase its costs.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Dollar Rolls Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Dollar rolls involve the risk that the market value of the securities that the Fund is committed to buy may decline below the price of the securities the Fund has sold. These transactions may involve leverage.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Extension Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates rise, certain obligations will be paid off by the obligor more slowly than anticipated, causing the value of these securities to fall.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Foreign Securities Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include:<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Changes in foreign currency exchange rates can affect the value of the Fund's portfolio.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Settlement and clearance procedures in certain foreign markets may result in delays in payment for or delivery of securities not typically associated with settlement and clearance of U.S. investments.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>High Portfolio Turnover Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund may engage in active and frequent trading of its portfolio securities. High portfolio turnover (more than 100%) may result in increased transaction costs to the Fund, including brokerage commissions, dealer mark-ups and other transaction costs on the sale of the securities and on reinvestment in other securities. The sale of Fund portfolio securities may result in the realization and/or distribution to shareholders of higher capital gains or losses as compared to a fund with less active trading policies. Given the frequency of sales, such gain or loss will likely be short-term capital gain or loss and, in the event of a gain, would increase an investor's tax liability unless shares are held through a tax-deferred or exempt vehicle. These effects of higher than normal portfolio turnover may adversely aff ect Fund performance. In addition, investment in mortgage dollar rolls and participation in TBA transactions may significantly increase the Fund's portfolio turnover rate. A TBA transaction is a method of trading mortgage-backed securities where the buyer and seller agree upon general trade parameters such as agency, settlement date, par amount, and price.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Interest Rate Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Interest rate risk is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall, and decrease as interest rates rise.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Junk Bonds Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Although junk bonds generally pay higher rates of interest than investment grade bonds, junk bonds are high risk investments that may cause income and principal losses for the Fund.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Market Risk and Selection Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Mortgage- and Asset-Backed Securities Risks</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Mortgage- and asset-backed securities represent interests in "pools" of mortgages or other assets, including consumer loans or receivables held in trust. Mortgage- and asset-backed securities are subject to credit, interest rate, prepayment and extension risks. These securities also are subject to risk of default on the underlying mortgage or asset, particularly during periods of economic downturn. Small movements in interest rates (both increases and decreases) may quickly and significantly reduce the value of certain mortgage-backed securities.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Prepayment Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates fall, certain obligations will be paid off by the obligor more quickly than originally anticipated, and the Fund may have to invest the proceeds in securities with lower yields.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Sovereign Debt Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Sovereign debt instruments are subject to the risk that a governmental entity may delay or refuse to pay interest or repay principal on its sovereign debt, due, for example, to cash flow problems, insufficient foreign currency reserves, political considerations, the relative size of the governmental entity's debt position in relation to the economy or the failure to put in place economic reforms required by the International Monetary Fund or other multilateral agencies.<br /><br /></font></li></ul></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time.&nbsp;<font class="_mt">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.</font> The following is a summary description of certain risks of investing in the Fund.</font></p> <ul> <li><font style="font-size: 10pt;" class="_mt"><b><i>Credit Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Credit risk refers to the possibility that the issuer of a security will not be able to make payments of interest and principal when due. Changes in an issuer's credit rating or the market's perception of an issuer's creditworthiness may also affect the value of the Fund's investment in that issuer.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Derivatives Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund's use of derivatives may reduce the Fund's returns and/or increase volatility. Volatility is defined as the characteristic of a security, an index or a market to fluctuate significantly in price within a short time period. Derivatives are also subject to counterparty risk, which is the risk that the other party in the transaction will not fulfill its contractual obligation. A risk of the Fund's use of derivatives is that the fluctuations in their values may not correlate perfectly with the overall securities markets. The possible lack of a liquid secondary market for derivatives and the resulting inability of the Fund to sell or otherwise close a derivatives position could expose the Fund to losses and could make derivatives more difficult for the Fund to value accurately. Derivatives may give rise to a form of lev erage and may expose the Fund to greater risk and increase its costs.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Dollar Rolls Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Dollar rolls involve the risk that the market value of the securities that the Fund is committed to buy may decline below the price of the securities the Fund has sold. These transactions may involve leverage.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Extension Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates rise, certain obligations will be paid off by the obligor more slowly than anticipated, causing the value of these securities to fall.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Foreign Securities Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include:<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Changes in foreign currency exchange rates can affect the value of the Fund's portfolio.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Settlement and clearance procedures in certain foreign markets may result in delays in payment for or delivery of securities not typically associated with settlement and clearance of U.S. investments.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>High Portfolio Turnover Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund may engage in active and frequent trading of its portfolio securities. High portfolio turnover (more than 100%) may result in increased transaction costs to the Fund, including brokerage commissions, dealer mark-ups and other transaction costs on the sale of the securities and on reinvestment in other securities. The sale of Fund portfolio securities may result in the realization and/or distribution to shareholders of higher capital gains or losses as compared to a fund with less active trading policies. Given the frequency of sales, such gain or loss will likely be short-term capital gain or loss and, in the event of a gain, would increase an investor's tax liability unless shares are held through a tax-deferred or exempt vehicle. These effects of higher than normal portfolio turnover may adversely aff ect Fund performance. In addition, investment in mortgage dollar rolls and participation in TBA transactions may significantly increase the Fund's portfolio turnover rate. A TBA transaction is a method of trading mortgage-backed securities where the buyer and seller agree upon general trade parameters such as agency, settlement date, par amount, and price.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Interest Rate Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Interest rate risk is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall, and decrease as interest rates rise.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Junk Bonds Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Although junk bonds generally pay higher rates of interest than investment grade bonds, junk bonds are high risk investments that may cause income and principal losses for the Fund.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Market Risk and Selection Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Mortgage- and Asset-Backed Securities Risks</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Mortgage- and asset-backed securities represent interests in "pools" of mortgages or other assets, including consumer loans or receivables held in trust. Mortgage- and asset-backed securities are subject to credit, interest rate, prepayment and extension risks. These securities also are subject to risk of default on the underlying mortgage or asset, particularly during periods of economic downturn. Small movements in interest rates (both increases and decreases) may quickly and significantly reduce the value of certain mortgage-backed securities.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Prepayment Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates fall, certain obligations will be paid off by the obligor more quickly than originally anticipated, and the Fund may have to invest the proceeds in securities with lower yields.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Sovereign Debt Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Sovereign debt instruments are subject to the risk that a governmental entity may delay or refuse to pay interest or repay principal on its sovereign debt, due, for example, to cash flow problems, insufficient foreign currency reserves, political considerations, the relative size of the governmental entity's debt position in relation to the economy or the failure to put in place economic reforms required by the International Monetary Fund or other multilateral agencies.<br /><br /></font></li></ul></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time.&nbsp;<font class="_mt">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.</font> The following is a summary description of certain risks of investing in the Fund.</font></p> <ul> <li><font style="font-size: 10pt;" class="_mt"><b><i>Corporate Loans Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Commercial banks and other financial institutions or institutional investors make corporate loans to companies that need capital to grow or restructure. Borrowers generally pay interest on corporate loans at rates that change in response to changes in market interest rates such as the London Interbank Offered Rate ("LIBOR") or the prime rates of U.S. banks. As a result, the value of corporate loan investments is generally less exposed to the adverse effects of shifts in market interest rates than investments that pay a fixed rate of interest.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Credit Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Credit risk refers to the possibility that the issuer of a security will not be able to make payments of interest and principal when due. Changes in an issuer's credit rating or the market's perception of an issuer's creditworthiness may also affect the value of the Fund's investment in that issuer.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Derivatives Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund's use of derivatives may reduce the Fund's returns and/or increase volatility. Volatility is defined as the characteristic of a security, an index or a market to fluctuate significantly in price within a short time period. Derivatives are also subject to counterparty risk, which is the risk that the other party in the transaction will not fulfill its contractual obligation. A risk of the Fund's use of derivatives is that the fluctuations in their values may not correlate perfectly with the overall securities markets. The possible lack of a liquid secondary market for derivatives and the resulting inability of the Fund to sell or otherwise close a derivatives position could expose the Fund to losses and could make derivatives more difficult for the Fund to value accurately. Derivatives may give rise to a form of lev erage and may expose the Fund to greater risk and increase its costs.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Extension Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates rise, certain obligations will be paid off by the obligor more slowly than anticipated, causing the value of these securities to fall.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Foreign Securities Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include:<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Changes in foreign currency exchange rates can affect the value of the Fund's portfolio.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position. <br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Settlement and clearance procedures in certain foreign markets may result in delays in payment for or delivery of securities not typically associated with settlement and clearance of U.S. investments.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Interest Rate Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Interest rate risk is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall, and decrease as interest rates rise.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Junk Bonds Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Although junk bonds generally pay higher rates of interest than investment grade bonds, junk bonds are high risk investments that may cause income and principal losses for the Fund.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Market Risk and Selection Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Prepayment Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates fall, certain obligations will be paid off by the obligor more quickly than originally anticipated, and the Fund may have to invest the proceeds in securities with lower yields.<br /><br /></font></li></ul></div> </div> <div class="MetaData"> <p align="left"><font style="font-size: 30pt;" class="_mt">Fund Overview</font></p> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Key Facts about BlackRock Total Return Fund</i></b></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 14pt;" class="_mt"><b><i>Key Facts about BlackRock Total Return Fund</i></b></font></p></div> <div class="MetaData"><em><strong> </strong></em> <div> <p align="left"><font style="font-size: 30pt;" class="_mt">Fund Overview</font></p></div> <p align="left"><font style="font-size: 14pt;" class="_mt"><em><strong>Key Facts about BlackRock High Income Fund</strong></em></font></p><em><strong> </strong></em></div> <div class="MetaData"> <p align="left"><font style="font-size: 14pt;" class="_mt"><b><i>Key Facts about BlackRock Total Return Fund</i></b></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 30pt;" class="_mt">Fund Overview</font></p> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Key Facts about BlackRock Total Return Fund</i></b></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 30pt;" class="_mt">Fund Overview</font></p> <p align="left"><font style="font-size: 14pt;" class="_mt"><b><i>Key Facts about BlackRock High Income Fund</i></b></font></p></div> <div class="MetaData"> <p style="line-height: normal; margin: 0in 0in 0pt; font-family: 'Calibri','sans-serif'; font-size: 11pt;" class="MsoNormal"><b><font style="font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">Shareholder Fees <br />(fees paid directly from your investment)</font></b></p></div> <div> <p style="line-height: normal; margin: 0in 0in 0pt; font-family: 'Calibri','sans-serif'; font-size: 11pt;" class="MsoNormal"><b><font style="font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">Shareholder Fees <br />(fees paid directly from your investment)</font></b></p></div> <div class="MetaData"> <p style="line-height: 115%; margin: 0in 0in 10pt; font-family: 'Calibri','sans-serif'; font-size: 11pt;" class="MsoNormal"><b><font style="line-height: 115%; font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">Shareholder Fees<br />(fees paid directly from your investment)</font></b></p></div> <div class="MetaData"> <p style="line-height: normal; margin: 0in 0in 0pt; font-family: 'Calibri','sans-serif'; font-size: 11pt;" class="MsoNormal"><b><font style="font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">Shareholder Fees <br />(fees paid directly from your investment)</font></b></p> <p style="line-height: normal; margin: 0in 0in 0pt; font-family: 'Calibri','sans-serif'; font-size: 11pt;" class="MsoNormal"><strong><font class="_mt"> </font></strong>&nbsp;</p></div> <div class="MetaData"> <p style="line-height: normal; margin: 0in 0in 0pt; font-family: 'Calibri','sans-serif'; font-size: 11pt;" class="MsoNormal"><b><font style="font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">Shareholder Fees <br />(fees paid directly from your investment)</font></b></p></div> <div class="MetaData"> <p style="line-height: 115%; margin: 0in 0in 10pt; font-family: 'Calibri','sans-serif'; font-size: 11pt;" class="MsoNormal"><b><font style="line-height: 115%; font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">Shareholder Fees<br />(fees paid directly from your investment)</font></b></p></div> <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleShareholderFeesBlackrockTotalReturnFundBlackrock column period compact * column dei_DocumentInformationDocumentAxis compact cik000276463_BlackrockMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div> <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleShareholderFeesBlackrockTotalReturnFundInvIns column period compact * column dei_DocumentInformationDocumentAxis compact cik000276463_InvInsMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div> <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleShareholderFeesBlackrockHighIncomeFundInvIns column period compact * column dei_DocumentInformationDocumentAxis compact cik000276463_InvInsMember column dei_LegalEntityAxis compact cik000276463_S000004072Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div> <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleShareholderFeesBlackrockTotalReturnFundPrime column period compact * column dei_DocumentInformationDocumentAxis compact cik000276463_PrimeMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div> <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleShareholderFeesBlackrockTotalReturnFundService column period compact * column dei_DocumentInformationDocumentAxis compact cik000276463_ServiceMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div> <div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleShareholderFeesBlackrockHighIncomeFundService column period compact * column dei_DocumentInformationDocumentAxis compact cik000276463_ServiceMember column dei_LegalEntityAxis compact cik000276463_S000004072Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div> <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Investment Strategies of the Fund</i></b></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><strong><em>Principal Investment Strategies of the Fund</em></strong></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Investment Strategies of the Fund</i></b></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Investment Strategies of the Fund</i></b></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Investment Strategies of the Fund</i></b></font></p></div> <div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Investment Strategies of the Fund</i></b></font></p></div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font></font>Both U.S. and foreign companies and governments may issue these securities.&nbsp;<font class="_mt">Under normal circumstances, the Fund invests at least 80% of its assets in bonds and invests primarily in investment grade fixed-income securities.</font> The Fund may invest in fixed-income securities of any duration or maturity.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund will invest most of its assets in securities issued by U.S. issuers, but may also invest a portion of its assets in securities issued by foreign issuers. The Fund may also invest in derivative securities for hedging purposes or to increase the return on its investments. The Fund may also enter into dollar rolls.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Total Return Fund may invest up to 20% of its net assets in fixed-income securities that are rated below investment grade by at least one of the recognized rating agencies or in unrated securities of equivalent credit quality.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund is a "feeder" fund that invests all of its assets in a corresponding "master" portfolio, the Master Total Return Portfolio (the "Master Portfolio"), a series of the Master Bond LLC (the "Master LLC"), a mutual fund that has the same investment objectives and strategies as the Fund. All investments will be made at the level of the Master Portfolio. This structure is sometimes called a "master/feeder" structure. The Fund's investment results will correspond directly to the investment results of the underlying Master Portfolio in which it invests. For simplicity, this Prospectus uses the term "Fund" to include the Master Portfolio.</font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The Total Return Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font></font></font></font></font></font>Both U.S. and foreign companies and governments may issue these securities.&nbsp;<font class="_mt">Under normal circumstances, the Total Return Fund invests at least 80% of its assets in bonds and invests primarily in investment grade fixed-income securities.</font> The Total Return Fund may invest in fixed-income securities of any duration or maturity.& lt;/font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Total Return Fund will invest most of its assets in securities issued by U.S. issuers, but may also invest a portion of its assets in securities issued by foreign issuers. The Total Return Fund may also invest in derivative securities for hedging purposes or to increase the return on its investments. The Total Return Fund may also enter into dollar rolls.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Total Return Fund may invest up to 20% of its net assets in fixed-income securities that are rated below investment grade by at least one of the recognized rating agencies or in unrated securities of equivalent credit quality.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Total Return Fund is a "feeder" fund that invests all of its assets in a corresponding "master" portfolio, the Master Total Return Portfolio ("Master Portfolio"), a series of the Master Bond LLC ("Master LLC"), a mutual fund that has the same investment objectives and strategies as the Total Return Fund. All investments will be made at the level of the Master Portfolio. This structure is sometimes called a "master/feeder" structure. The Total Return Fund's investment results will correspond directly to the investment results of the underlying Master Portfolio in which it invests. For simplicity, this Prospectus uses the term "Total Return Fund" and "Fund" to include the Master Portfolio.</font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The High Income Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font></font>Both U.S. and foreign companies and governments may issue these securities.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">Under normal circumstances, the High Income Fund invests at least 80% of its assets in bonds that are rated in the lower rating categories by at least one of the recognized rating agencies including Baa or lower by Moody's Investors Service, Inc. ("Moody's") or BBB or lower by Standard &amp; Poor's ("S&amp;P") or Fitch Ratings ("Fitch"), or in unrated securities that Fund management believes are of comparable quality. Securities rated below Baa by Moody's or below BBB by S&amp;P or Fitch are commonly known as "junk bonds." Junk bonds are high-risk investments that may cause income and principal losses for the High Income Fund. The High Income Fund may invest in fixed-income securities of any duration or maturity. The High Income Fund may also invest up to 15% of its net assets in secondary market purchases of corporate loans.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The High Income Fund will invest most of its assets in securities issued by U.S. issuers, but may also invest a portion of its assets in securities issued by foreign issuers. The Fund may also invest in derivative securities for hedging purposes or to increase the return on its investments.</font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The Total Return Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font></font>Both U.S. and foreign companies and governments may issue these securities.&nbsp;<font class="_mt">Under normal circumstances, the Total Return Fund invests at least 80% of its assets in bonds and invests primarily in investment grade fixed-income securities.</font> The Total Return Fund may invest in fixed-income securities of any duration or maturity.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Total Return Fund will invest most of its assets in securities issued by U.S. issuers, but may also invest a portion of its assets in securities issued by foreign issuers. The Total Return Fund may also invest in derivative securities for hedging purposes or to increase the return on its investments. The Total Return Fund may also enter into dollar rolls.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Total Return Fund may invest up to 20% of its net assets in fixed-income securities that are rated below investment grade by at least one of the recognized rating agencies or in unrated securities of equivalent credit quality.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Total Return Fund is a "feeder" fund that invests all of its assets in a corresponding "master" portfolio, the Master Total Return Portfolio ("Master Portfolio"), a series of the Master Bond LLC ("Master LLC"), a mutual fund that has the same investment objectives and strategies as the Total Return Fund. All investments will be made at the level of the Master Portfolio. This structure is sometimes called a "master/feeder" structure. The Total Return Fund's investment results will correspond directly to the investment results of the underlying Master Portfolio in which it invests. For simplicity, this Prospectus uses the term "Total Return Fund" and "Fund" to include the Master Portfolio.</font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font></font></font></font></font></font>Both U.S. and foreign companies and governments may issue these securities.&nbsp;<font class="_mt">Under normal circumstances, the Fund invests at least 80% of its assets in bonds and invests primarily in investment grade fixed-income securities.</font> The Fund may invest in fixed-income securities of any duration or maturity.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund will invest most of its assets in securities issued by U.S. issuers, but may also invest a portion of its assets in securities issued by foreign issuers. The Fund may also invest in derivative securities for hedging purposes or to increase the return on its investments. The Total Return Fund may also enter into dollar rolls.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Total Return Fund may invest up to 20% of its net assets in fixed-income securities that are rated below investment grade by at least one of the recognized rating agencies or in unrated securities of equivalent credit quality.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund is a "feeder" fund that invests all of its assets in a corresponding "master" portfolio, the Master Total Return Portfolio (the "Master Portfolio"), a series of the Master Bond LLC (the "Master LLC"), a mutual fund that has the same investment objectives and strategies as the Fund. All investments will be made at the level of the Master Portfolio. This structure is sometimes called a "master/feeder" structure. The Fund's investment results will correspond directly to the investment results of the underlying Master Portfolio in which it invests. For simplicity, this Prospectus uses the term "Fund" to include the Master Portfolio.</font></p></div> </div> <div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The High Income Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font></font>Both U.S. and foreign companies and governments may issue these securities.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">Under normal circumstances, the High Income Fund invests at least 80% of its assets in bonds that are rated in the lower rating categories by at least one of the recognized rating agencies including Baa or lower by Moody's Investors Service, Inc. ("Moody's") or BBB or lower by Standard &amp; Poor's ("S&amp;P") or Fitch Ratings ("Fitch"), or in unrated securities that Fund management believes are of comparable quality. Securities rated below Baa by Moody's or below BBB by S&amp;P or Fitch are commonly known as "junk bonds." Junk bonds are high-risk investments that may cause income and principal losses for the High Income Fund. The High Income Fund may invest in fixed-income securities of any duration or maturity. The High Income Fund may also invest up to 15% of its net assets in secondary market purchases of corporate loans.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The High Income Fund will invest most of its assets in securities issued by U.S. issuers, but may also invest a portion of its assets in securities issued by foreign issuers. The Fund may also invest in derivative securities for hedging purposes or to increase the return on its investments.</font></p></div> </div> <font style="font-size: 10pt;" class="_mt">The Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font> <font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The Total Return Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font></font></font> <font style="font-size: 10pt;" class="_mt">The High Income Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font> <font style="font-size: 10pt;" class="_mt">The Total Return Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font> <font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font></font></font> <font style="font-size: 10pt;" class="_mt">The High Income Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font> The fees and expenses shown in the table and the example that follows include both the expenses of the Fund and the Fund's share of the allocated expenses of Master Total Return Portfolio (the "Portfolio"). The fees and expenses shown in the table and the example that follows include both the expenses of Total Return Fund and Total Return Fund's share of the allocated expenses of Master Total Return Portfolio (the "Master Portfolio"). The fees and expenses shown in the table and the example that follows include both the expenses of the Fund and the Fund's share of the allocated expenses of Master Total Return Portfolio (the "Portfolio"). The fees and expenses shown in the table and the example that follows include both the expenses of the Fund and the Fund's share of the allocated expenses of Master Total Return Portfolio (the "Portfolio"). For the year ended September 30, 2010, the Investor B2 Shares did not pay distribution fees due to regulatory fee limits. The Total Annual Fund Operating Expenses have been restated to reflect as if the distribution fees had been paid. As described in the "Management of the Fund" section of the Fund's prospectus on page 23, BlackRock has contractually agreed to waive the Total Return Fund's management fee in the amount of the Total Return Fund's share of the management fee paid by the Master Portfolio for as long as the Total Return Fund invests in the Master Portfolio. In addition, BlackRock has contractually agreed to waive and/or reimburse fees and/or expenses in order to limit Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements (excluding Dividend Expense, Interest Expense, Acquired Fund Fees and Expenses and certain other Fund expenses) to 0.40% of average daily net assets until February 1, 2012. These contractual agreements may be terminated upon 90 days notice by a majority of the non-interested directors of the Fund or by a vote of a majority of the outstanding voti ng securities of the Fund. As described in the "Management of the Funds" section of the Fund's prospectus on page 44, BlackRock has contractually agreed to waive the Total Return Fund's management fee in the amount of the Total Return Fund's share of the management fee paid by the Master Portfolio for as long as the Total Return Fund invests in the Master Portfolio. In addition, BlackRock has contractually agreed to waive and/or reimburse fees or expenses in order to limit Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements (excluding Dividend Expense, Interest Expense, Acquired Fund Fees and Expenses and certain other Fund expenses) to 0.90% (for Investor A Shares), 1.65% (for Investor C Shares), 0.55% (for Institutional Shares) and 1.10% (for Class R Shares) of average daily net assets until February 1, 2012. These contractual agreements may be terminated upon 90 day s' notice by a majority of the non-interested directors of the Fund or by a vote of a majority of the outstanding voting securities of the Fund. As described in the "Management of the Funds" section of the Fund's prospectus on page 33, BlackRock has contractually agreed to waive the Total Return Fund's management fee in the amount of the Total Return Fund's share of the management fee paid by the Master Portfolio for as long as the Total Return Fund invests in the Master Portfolio. In addition, BlackRock has contractually agreed to waive and/or reimburse fees and/or expenses in order to limit Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements (excluding Dividend Expense, Interest Expense, Acquired Fund Fees and Expenses and certain other Fund expenses) to 1.65% (for Investor B2 Shares) of average daily net assets until February 1, 2012. These contractual agreements may be terminated upon 90 days' notice by a majority of the non-interested directors of the Fund or by a vote of a major ity of the outstanding voting securities of the Fund. As described in the "Management of the Fund" section of the Fund's prospectus on page 24, BlackRock has contractually agreed to waive the Total Return Fund's management fee in the amount of the Total Return Fund's share of the management fee paid by the Master Portfolio for as long as the Total Return Fund invests in the Master Portfolio. In addition, BlackRock has contractually agreed to waive and/or reimburse fees and/or expenses in order to limit Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements (excluding Dividend Expense, Interest Expense, Acquired Fund Fees and Expenses and certain other Fund expenses) to 0.85% of average daily net assets until February 1, 2012. These contractual agreements may be terminated upon 90 days' notice by a majority of the non-interested directors of the Fund or by a vote of a majority of the outstanding vot ing securities of the Fund. A CDSC of 0.75% is assessed on certain redemptions of Investor A Shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase of an investment of $1,000,000 or more. The CDSC is 4.00% if shares are redeemed within two years. The CDSC for Investor B Shares decreases for redemptions made in subsequent years. After six years there is no CDSC on Investor B Shares. (See the section "Details about the Share Classes &#8212; Investor B Shares" for the complete schedule of CDSCs.) There is no CDSC on Investor C Shares after one year. A contingent deferred sales charge ("CDSC") of 0.75% is assessed on certain redemptions of Investor A Shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase of an investment of $1,000,000 or more. The CDSC is 4.00% if shares are redeemed within two years. The CDSC for Investor B Shares decreases for redemptions made in subsequent years. After six years there is no CDSC on Investor B Shares. (See the section "Details about the Share Classes &#8212; Investor B Shares" for the complete schedule of CDSCs.) There is no CDSC on Investor C Shares after one year. There is no CDSC on Investor C1 and Investor C2 Shares after one year. A contingent deferred sales charge ("CDSC") of 1.00% is assessed if shares are redeemed within one year. The CDSC for Investor B1 Shares decreases for redemptions made in subsequent years. After three years there is no CDSC on Investor B1 Shares. The CDSC is 4.50% if shares are redeemed within one year. The CDSC for Investor B2 Shares decreases for redemptions made in subsequent years. After six years there is no CDSC on Investor B2 Shares. There is no contingent deferred sales charge ("CDSC") on Investor C1 Shares after one year. 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The document type should be limited to the same value as the supporting SEC submission type. The acceptable values are as follows: S-1, S-3, S-4, S-11, F-1, F-3, F-4, F-9, F-10, 6-K, 8-K, 10, 10-K, 10-Q, 20-F, 40-F, N-1A, 485BPOS, NCSR, N-Q, and Other.No authoritative reference available.falsefalse4false0dei_DocumentPeriodEndDatedeifalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse002010-09-30falsefalsetruefalsefalseOtherxbrli:dateItemTypedateThe end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements this will be the filing date. The format of the date is CCYY-MM-DD.No authoritative reference available.falsefalse5false0dei_EntityRegistrantNamedeifalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00BLACKROCK BOND FUND, INC.falsefalsefalsefalsefalseOtherxbrli:normalizedStringItemTypenormalizedstringThe exact name of the entity filing the report as specified in its charter, which is required by form s filed with the SEC.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation 12B -Number 240 -Section 12b -Subsection 1 falsefalse6false0dei_EntityCentralIndexKeydeifalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse000000276463falsefalsefalsefalsefalseOtherus-types:centralIndexKeyItemTypenaA unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation 12B -Number 240 -Section 12b -Subsection 1 falsefalse7false0dei_AmendmentFlagdeifalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 00falsefalsefalsefalsefalsefalseOtherxbrli:booleanItemTypenaIf the value is true, then the document as an amendment to previously-filed/accepted document.No authoritative reference available.falsefalse8false0dei_DocumentCreationDatedeifalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse002011-01-28falsefalsetruefalsefalseOtherxbrli:dateItemTypedateThe date the document was made available and submitted, in CCYY-MM-DD format. The date of submission, date of acceptance by the recipient, and the document effective date are all potentially different.No authoritative reference available.falsefalse9false0dei_DocumentEffectiveDatedeifalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse002011-01-28falsefalsetruefalsefalseOtherxbrli:dateItemTypedateThe date when a document, upon receipt and acceptance, becomes officially effective, in CCYY-MM-DD format. Usually it is a system-assigned date time value, but it may be declared by the submitter in some cases.No authoritative reference available.falsefalse10false0rr_ProspectusDaterrfalsenadurationNo definition available.falsefalsefalsefalsefa lsefalsefalsefalsefalsefalse1falsefalsefalse002011-01-28falsefalsetruefalsefalseOtherxbrli:dateItemTypedateThe date of the prospectus.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 1 -Paragraph 3 -Subsection a falsefalse11false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse2falsefalseUSDtruefalse{dei_DocumentInformationDocumentAxis} : Inv Ins Member {dei_LegalEntityAxis} : S000004072 Member {rr_ProspectusShareClassAxis} : C000011392 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_20118http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxis xbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor Arr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011392Memberrr_ProspectusShareClassAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse12true0rr_Ris kReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse13false0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.040.04falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalse14false0rr_MaximumDeferredSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00[1]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) ba sed on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalse15false0rr_RedemptionFeeOverRedemptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated 1truetruetrue0.020.02falsefalsefalsefalsefalseOtherrr:NonPositivePure4Typepure"Redemption Fee" (as a percentage of amount redeemed, if applicable) If the Fund is an Exchange-Traded Fund and issues or redeems shares in creation units of not less than 25,000 shares each, exclude any fees charged for the purchase and redemption of the Fund's creation units. "Redemption Fee" includes a fee charged for any re demption of the Fund's shares, but does not include a deferred sales charge (load) imposed upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph b -Subsection instructions falsefalse16false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetru etrue0.00420.0042falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse17false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00250.0025falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Refer ence 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalse18false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00260.0026falsefalsefalsefalsefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not incl ude extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions falsefalse19false0rr_Component1OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00010.0001falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse20false0rr_Component2OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue 0.00250.0025falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 10 -Subsection table falsefalse21false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00930.0093falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fun d, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions falsefalse22false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue491491falsetruefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse23false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue685685falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse24false0rr_ExpenseExampleYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue894894falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse25false0rr_ExpenseExampleYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue14971497falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse26false0rr_AnnualReturn2001rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.0008-0.0008falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return informati on as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse27false0rr_AnnualReturn2002rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.0282-0.0282falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse28false0rr_AnnualReturn2003rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.32080.3208falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return i nformation as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalse29false0rr_AnnualReturn2004rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.11660.1166falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return i nformation as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalse30false0rr_AnnualReturn2005rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.01120.0112falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return i nformation as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse31false0rr_AnnualReturn2006rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.12360.1236falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return i nformation as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse32false0rr_AnnualReturn2007rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.01820.0182falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return i nformation as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalse33false0rr_AnnualReturn2008rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.322-0.322falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return i nformation as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse34false0rr_AnnualReturn2009rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.56870.5687falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return i nformation as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalse35false0rr_AnnualReturn2010rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.18750.1875falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return i nformation as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse36false0rr_HighestQuarterlyReturnLabelrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse< NumericAmount>00highest returnfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar ye ar, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse37false0rr_BarChartHighestQuarterlyReturnDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse< /DisplayZeroAsNone>002009-06-30falsefalsetruefalsefalseOtherxbrli:dateItemTypedateIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse38false0rr_BarChartHighestQuarterlyReturnrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.20390.2039falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse39false0rr_LowestQuarterlyReturnLabelrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00lowest returnfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calenda r year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse40false0rr_BarChartLowestQuarterlyReturnDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse002008-12-31falsefalsetruefalsefalseOtherxbrli:dateItemTypedateIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a ca lendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse41false0rr_BarChartLowestQuarterlyReturnrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.2378-0.2378falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse42false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue< NumericAmount>0.140.14falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse43false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.0 6760.0676falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse44false0rr_AverageAnnualReturnYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 07220.0722falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse45false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse3falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : Inv Ins Member {dei_LegalEntityAxis} : S000004072 Member {rr_ProspectusShareClassAxis} : C000011392 Member {rr_PerformanceMeasureAxis} : Return After Taxes on Distributions 1/28/2011 - 1/28/2011 Duration_1_28_2011_To_1_28_201132http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor Arr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011392Memberrr_ProspectusShareClassAxisexplicitMemberfalsefalseReturn After Taxes on Distributionsrr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldirr_AfterTaxesOnDistributionsMember< /Id>rr_PerformanceMeasureAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalse46true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse47false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.10940.1094falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse48false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.0 3730.0373falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse49false0rr_AverageAnnualReturnYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 04020.0402falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse50false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse4falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : Inv Ins Member {dei_LegalEntityAxis} : S000004072 Member {rr_ProspectusShareClassAxis} : C000011392 Member {rr_PerformanceMeasureAxis} : Return After Taxes on Distributions and Sale of Shares 1/28/2011 - 1/28/2011 Duration_1_28_2011_To_1_28_201131http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor Arr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011392Memberrr_ProspectusShareClassAxisexplicitMemberfalsefalseReturn After Taxes on Distributions and Sale of Sharesrr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldirr_AfterTaxesOnD istributionsAndSalesMemberrr_PerformanceMeasureAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalse51true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse52false0rr_AverageAnnualReturnYear01rrfalsenaduration

No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.08940.0894falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse53false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.0 3880.0388falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse54false0rr_AverageAnnualReturnYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 04140.0414falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse55false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse5falsefalseUSDtruefalse{dei_DocumentInformationDocumentAxis} : Inv Ins Member {dei_LegalEntityAxis} : S000004072 Member {rr_ProspectusShareClassAxis} : C000011393 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_201127http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxi sxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor Brr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011393Memberrr_ProspectusShareClassAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse56true0rr_Ri skReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse57false0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3 .instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalse58false0rr_MaximumDeferredSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.040.04[2]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (lo ad) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalse59false0rr_RedemptionFeeOverRedemptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated 1truetruetrue0.020.02falsefalsefalsefalsefalseOtherrr:NonPositivePure4Typepure"Redemption Fee" (as a percentage of amount redeemed, if applicable) If the Fund is an Exchange-Traded Fund and issues or redeems shares in creation units of not less than 25,000 shares each, exclude any fees charged for the purchase and redemption of the Fund's creation units. "Redemption Fee" includes a fee charged for any re demption of the Fund's shares, but does not include a deferred sales charge (load) imposed upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph b -Subsection instructions falsefalse60false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetru etrue0.00420.0042falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse61false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00750.0075falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Refer ence 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalse62false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00380.0038falsefalsefalsefalsefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not incl ude extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions falsefalse63false0rr_Component1OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00010.0001falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse64false0rr_Component2OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue 0.00370.0037falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 10 -Subsection table falsefalse65false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.01550.0155falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fun d, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions falsefalse66false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue558558falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse67false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue790790falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse68false0rr_ExpenseExampleYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue10451045falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse69false0rr_ExpenseExampleYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue18451845falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse70false0rr_ExpenseExampleNoRedemptionYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetru e158158falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse71false0rr_ExpenseExampleNoRedemptionYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue< /DisplayZeroAsNone>490490falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse72false0rr_ExpenseExampleNoRedemptionYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue 845845falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subparagraph f -Subsection instructions falsefalse73false0rr_ExpenseExampleNoRedemptionYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue 18451845falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subparagraph f -Subsection instructions falsefalse74false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0 .14030.1403falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse75false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.0 6710.0671falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse76false0rr_AverageAnnualReturnYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 07070.0707falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse77false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse6falsefalseUSDtruefalse{dei_DocumentInformationDocumentAxis} : Inv Ins Member {dei_LegalEntityAxis} : S000004072 Member {rr_ProspectusShareClassAxis} : C000037622 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_201129http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxi sxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor Crr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000037622Memberrr_ProspectusShareClassAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse78true0rr_Ri skReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse79false0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3 .instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalse80false0rr_MaximumDeferredSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.010.01[3]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (lo ad) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalse81false0rr_RedemptionFeeOverRedemptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated 1truetruetrue0.020.02falsefalsefalsefalsefalseOtherrr:NonPositivePure4Typepure"Redemption Fee" (as a percentage of amount redeemed, if applicable) If the Fund is an Exchange-Traded Fund and issues or redeems shares in creation units of not less than 25,000 shares each, exclude any fees charged for the purchase and redemption of the Fund's creation units. "Redemption Fee" includes a fee charged for any re demption of the Fund's shares, but does not include a deferred sales charge (load) imposed upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph b -Subsection instructions falsefalse82false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetru etrue0.00420.0042falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse83false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.010.01falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalse84false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.0050.005falsefalsefalsefalsefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not includ e extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions falsefalse85false0rr_Component1OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00010.0001falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse86false0rr_Component2OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue 0.00490.0049falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 10 -Subsection table falsefalse87false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.01920.0192falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fun d, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions falsefalse88false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue295295falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse89false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue603603falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse90false0rr_ExpenseExampleYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue10371037falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse91false0rr_ExpenseExampleYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue22432243falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse92false0rr_ExpenseExampleNoRedemptionYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetru e195195falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse93false0rr_ExpenseExampleNoRedemptionYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue< /DisplayZeroAsNone>603603falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse94false0rr_ExpenseExampleNoRedemptionYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue 10371037falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subparagraph f -Subsection instructions falsefalse95false0rr_ExpenseExampleNoRedemptionYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue 22432243falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subparagraph f -Subsection instructions falsefalse96false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0 .16870.1687falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse97false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.0 6510.0651falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse98false0rr_AverageAnnualReturnYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 0670.067falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse99false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse7falsefalseUSDtruefalse{dei_DocumentInformationDocumentAxis} : Inv Ins Member {dei_LegalEntityAxis} : S000004072 Member {rr_ProspectusShareClassAxis} : C000011395 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_201128http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxi sxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberfalsefalseInstitutionalrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011395Memberrr_ProspectusShareClassAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit1 Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse100true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse101false0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage . Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalse102false0rr_MaximumDeferredSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1true< /IsNumeric>truetrue00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset v alue at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalse103false0rr_RedemptionFeeOverRedemptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truetruetrue0.020.02falsefalsefalsefalsefalseOtherrr:NonPositivePure4Typepure"Redemption Fee" (as a percentage of amount redeemed, if applicable) If the Fund is an Exchange-Traded Fund and issues or redeems shares in creation units of not less than 25,000 shares each, exclude any fees charged for the purchase and redemption of the Fund's creation units. "Redemption Fee" includes a fee charged for any r edemption of the Fund's shares, but does not include a deferred sales charge (load) imposed upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph b -Subsection instructions falsefalse104false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetr uetrue0.00420.0042falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse105false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalse106false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00280.0028falsefalsefalsefalsefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not inc lude extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions falsefalse107false0rr_Component1OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue< NumericAmount>0.00010.0001falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse108false0rr_Component2OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00270.0027falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 10 -Subsection table falsefalse109false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.0070.007falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund , provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions falsefalse110false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue7272falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse111false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue224224falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse112false0rr_ExpenseExampleYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue390390falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse113false0rr_ExpenseExampleYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue871871falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse114false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue 0.1930.193falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse115false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 07880.0788falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse116false0rr_AverageAnnualReturnYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0 .07920.0792falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse117false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse8falsefalseUSDtruefalse{dei_DocumentInformationDocumentAxis} : Inv Ins Member {dei_LegalEntityAxis} : S000004072 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_20114http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxis xbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse118true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsef alsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse119< /Id>false0rr_RiskReturnHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"><em>< ;strong> </strong></em> <div> <p align="left"><font style="font-size: 30pt;" class="_mt">Fund Overview</font></p></div> <p align="left"><font style="font-size: 14pt;" class="_mt"><em><strong>Key Facts about BlackRock High Income Fund</strong></em></font></p><em><strong> </strong></em></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Investment Objectives/Goals Include the following information, in plain English under rule 421(d) under the Securities Act, in the order and subject matter indicatedReference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 falsefalse120false0rr_ObjectiveHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<em><strong><font style="font-size: 12pt;" class="_mt">Investment Objective</font></strong></em>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse121false0rr_ObjectivePrimaryTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse< NumericAmount>00<div> <font style="font-size: 10pt;" class="_mt">The primary investment objective of the BlackRock High Income Fund (the "High Income Fund" or the "Fund") is to provide shareholders with as high a level of current income as is consistent with the investment policies of such Fund. </font> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse122false0rr_ObjectiveSecondaryTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> As a secondary objective, the High Income Fund seeks capital appreciation when consistent with its primary objective. </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse123false0rr_ExpenseHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Fees and Expenses of the Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Fee Table Includes the following information, in plain English under rule 421(d) under the Securities Act, after Item 2 Fees and expenses of the Fund This table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to inve st in the future, at least $[_____] in [name of fund family] funds. Shareholder Fees (fees paid directly from your investment) 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 you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be You would pay the following expenses if you did not redeem your shares The Example does not reflect sales charges (loads) on reinvested dividends [and other distributions]. If these sales charges (loads) were included, your costs would be higher. Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its po rtfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was __% of the average value of its whole portfolio. Instructions. A.3.instructions.6 New Funds. For purposes of this Item, a "New Fund" is a Fund that does not include in Form N-1A financial statements reporting operating results or that includes financial statements for the Fund's initial fiscal year reporting operating results for a period of 6 months or less. The following Instructions apply to New Funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph d -Subsection instructions falsefalse124false0rr_ExpenseNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.&nbsp;<font class="_mt">You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least&nbsp;<font class="_mt">$25,000</font> in the BlackRock-advised fund complex.</font> More information about these and other discounts is available from your financial professional and in the "Details about the Share Classes" section on page 27 of the Fund's prospectus and in the "Purchase of Shares" section on page II-67 of the Fund's statement of additional information.</font></p></div> </div>falsefalsefalsefa lsefalseOtherus-types:textBlockItemTypestringThis table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $[_____] in [name of fund family] funds. Include the narrative explanations in the order indicated. A Fund may modify the narrative explanations if the explanation contains comparable information to that shown.The narrative explanation regarding sales charge discounts is only required by a Fund that offers such discounts and should specify the minimum level of investment required to qualify for a discount. Modify the narrative explanation to state that Fund shares are sold on a national securities exchange at the end of the time periods indicated, and that broker age commissions for buying and selling Fund shares through a broker are not reflected.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph b -Subsection instructions falsefalse125false0rr_ShareholderFeesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="line-height: 115%; margin: 0in 0in 10pt; font-family: 'Calibri','sans-serif'; font-size: 11pt;" class="MsoNormal"><b><font style="line-height: 115%; font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">Shareholder Fees<br />(fees paid directly from your investment)</font></b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringShareholder Fees (fees paid directly from your investment).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subsection table falsefalse126false0rr_OperatingExpensesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"><strong> </strong> <table border="0" cellspacing="0" cellpadding="0" width="100%"> <tr><td> <p style="margin-top: 0px; margin-bottom: 0px;"><strong><font class="_mt" size="2">Annual Fund Operating Expenses<br /></font><font style="font-size: 9pt;" class="_mt">(expenses that you pay each year as </font></strong></p> <p style="margin-top: 0px; margin-bottom: 0px;"><strong><font style="font-size: 9pt;" class="_mt">a percentage of the value of your investment)</font></strong></p></td></tr></table></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringAnnual Fund Operating Expenses (ongoing expenses that you pay each year as a percentage of the value of your investment)Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 7 -Subsection table falsefalse127false0rr_PortfolioTurnoverHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 11pt;" class="_mt"><b>Portfolio Turnover</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 5 -Subsection instructions falsefalse128false0rr_PortfolioTurnoverTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was&nbsp;<font class="_mt">97%</font> of the average value of its portfolio.</font></p></div> </div>falsefalsefalsefalsefalse Otherus-types:textBlockItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subsection example falsefalse129false0rr_PortfolioTurnoverRaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.970.97falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureThis element represents the rate of portfolio turnover presented as a percentage (SEC Form N-1A 2006-09-14 A.3.example.3 Portfolio Turnover A.3.instructions.5 Portfolio Turnover).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subsection example falsefalse130false0rr_ExpenseBreakpointDiscountsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least&nbsp;<font class="_mt">$25,000</font> in the BlackRock-advised fund complex.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInclude the narrative explanations in the order indicated. A Fund may modify the narrative explanations if the explanation contains comparable information to that shown.The narrative explanation regarding sales charge discou nts is only required by a Fund that offers such discounts and should specify the minimum level of investment required to qualify for a discount.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph b -Subsection instructions falsefalse131false0rr_ExpenseBreakpointMinimumInvestmentRequiredAmountrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse2500025000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis element represents the minimum level of investment required to qualify for discounted sales charges or fund expenses (SEC Form N-1A 2006-09-14 A.3.instructions.1.b).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph b -Subsection instructions falsefalse132false0rr_ExpenseExampleHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 11pt;" class="_mt"><b>Example:</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringHeading for Expense Example.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse133false0rr_ExpenseExampleNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">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:</font></p></div> </div>falsefalsefalsefalsefalseOtherus-t ypes:textBlockItemTypestringThe Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection example falsefalse134false0rr_ExpenseExampleNoRedemptionByYearCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">You would pay the following expenses if you did not redeem your shares:</font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse135false0rr_StrategyHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalse false00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Investment Strategies of the Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industr y or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse136false0rr_StrategyNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse< NumericAmount>00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The High Income Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font></font>Both U.S. and foreign companies and governments may issue these securities.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">Under normal circumstances, the High Income Fund invests at least 80% of its assets in bonds that are rated in the lower rating categories by at least one of the recognized rating agencies including Baa or lower by Moody's Investors Service, Inc. ("Moody's") or BBB or lower by Standard &amp; Poor's ("S&amp;P") or Fitch Ratings ("Fitch"), or in unrated securities that Fund management believes are of comparable quality. Securities rated below Baa by Moody's or below BBB by S&amp;P or Fitch are commonly known as "junk bonds." Junk bonds are high-risk investments that may cause income and principal losses for the High Income Fund. The High Income Fund may invest in fixed-income securities of any duration or maturity. The High Income Fund may also invest up to 15% of its net assets in secondary market purchases of corporate loans.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The High Income Fund will invest most of its assets in securities issued by U.S. issuers, but may also invest a portion of its assets in securities issued by foreign issuers. The Fund may also invest in derivative securities for hedging purposes or to increase the return on its investments.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by i dentifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse137false0rr_StrategyPortfolioConcentrationrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font style="font-size: 10pt;" class="_mt">The High Income Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse138false0rr_RiskHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Risks of Investing in the Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNarrative Risk Disclosure.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subsection b falsefalse139false0rr_RiskNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p class="MetaData" align="left"><font style="font-size: 10pt;" class="_mt">Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time.<font class="_mt">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.</font> The following is a summary description of certain risks of investing in the Fund.</font></p> <div> <ul> <li><font style="font-size: 10pt;" class="_mt"><b><i>Corporate Loans Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Commercial banks and other financial institutions or institutional investors make corporate loans to companies that need capital to grow or restructure. Borrowers generally pay interest on corporate loans at rates that change in response to changes in market interest rates such as the London Interbank Offered Rate ("LIBOR") or the prime rates of U.S. banks. As a result, the value of corporate loan investments is generally less exposed to the adverse effects of shifts in market interest rates than investments that pay a fixed rate of interest.<br /></font></li></ul></div> <ul> <li><font style="font-size: 10pt;" class="_mt"><b><i>Credit Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Credit risk refers to the possibility that the issuer of a security will not be able to make payments of interest and principal when due. Changes in an issuer's credit rating or the market's perception of an issuer's creditworthiness may also affect the value of the Fund's investment in that issuer.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Derivatives Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund's use of derivatives may reduce the Fund's returns and/or increase volatility. Volatility is defined as the characteristic of a security, an index or a market to fluctuate significantly in price within a short time period. Derivatives are also subject to counterparty risk, which is the risk that the other party in the transaction will not fulfill its contractual obligation. A risk of the Fund's use of derivatives is that the fluctuations in their values may not correlate perfectly with the overall securities markets. The possible lack of a liquid secondary market for derivatives and the resulting inability of the Fund to sell or otherwise close a derivatives position could expose the Fund to losses and could make derivatives more difficult for the Fund to value accurately. Derivatives may give rise to a form of lev erage and may expose the Fund to greater risk and increase its costs.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Extension Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates rise, certain obligations will be paid off by the obligor more slowly than anticipated, causing the value of these securities to fall.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Foreign Securities Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include:<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Changes in foreign currency exchange rates can affect the value of the Fund's portfolio.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Settlement and clearance procedures in certain foreign markets may result in delays in payment for or delivery of securities not typically associated with settlement and clearance of U.S. investments.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Interest Rate Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Interest rate risk is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall, and decrease as interest rates rise.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Junk Bonds Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Although junk bonds generally pay higher rates of interest than investment grade bonds, junk bonds are high risk investments that may cause income and principal losses for the Fund.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Market Risk and Selection Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Prepayment Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates fall, certain obligations will be paid off by the obligor more quickly than originally anticipated, and the Fund may have to invest the proceeds in securities with lower yields.<br /><br /></font></li></ul></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringNarrative Risk Disclosure. A Fund may, in responding to thi s Item, describe the types of investors for whom the Fund is intended or the types of investment goals that may be consistent with an investment in the Fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph i -Clause instruction -Subsection b falsefalse140false0rr_RiskLoseMoneyrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringSummarize the principal risks of investing in the Fund, including the risks to which the Fund's portfolio as a whole is subject and the circumstances reasonably likely to affect adversely the Fund's net asset value, yield, and total return. Unless the Fund is a Money Market Fund, disclose that loss of money is a r isk of investing in the Fund. A Fund may, in responding to this Item, describe the types of investors for whom the Fund is intended or the types of investment goals that may be consistent with an investment in the Fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph i -Subsection b falsefalse141false0rr_BarChartAndPerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><i><strong>Performance Information</strong></i></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse142false0rr_PerformanceNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalse false00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font></font>The table compares the Fund's performance to that of the Barclays Capital U.S. Corporate High Yield 2% Issuer Capped Index. Prior to October 2, 2006, Investor C Share performance results are those of Institutional Shares (which have no distribution or service fees) restated to reflect Investor C Share fees.&nbsp;<font class="_mt">As with all such investments, past performance (before and after taxes) is not an indication of future results.</font>&nbsp;<font class="_mt">Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.</font>&nbsp;<font class="_mt">However, the table includes all applicable fees and sales charges.</font> If the Fund's investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund's returns would have been lower. Updated information on the Fund's performance can be obtained by visiting&nbsp;<font class="_mt">http://www.blackrock.com/funds</font> or can be obtained by phone at <font class="_mt">800-882-0052</font>. </font><font style="font-size: 10pt;" class="_mt"> </font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse143false0rr_PerformanceInformationIllustratesVariabilityOfReturnsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInclude the bar chart and table required by paragraphs (b)(2)(ii) and (iii) of this section. Provide a brief explanation of how the information illustrates the variability of the Fund's ret urns (e.g., by stating that the information provides some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for 1, 5, and 10 years compare with those of a broad measure of market performance). Provide a statement to the effect that the Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse144false0rr_PerformanceAvailabilityPhonerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00800-882-0052falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf applicable, include a statement explaining that updated performance information is available and providing a Web site address and/or toll-free (or collect) telephone number where the updated information may be obtained.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse145false0rr_PerformanceAvailabilityWebSiteAddressrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00http://www.blackrock.com/fundsfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf applicable, include a statement explaining that updated performance information is available and providing a Website address and/or toll-free (or collect) telephone number where the updated information may be obtained.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse146false0rr_PerformancePastDoesNotIndicateFuturerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00As with all such investments, past performance (before and after taxes) is not an indication of future results.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInclude the bar chart and table required by paragraphs (b)(2)(ii) and (iii) of this section. Provide a brief explanation of how the information illustrates the variability of the Fund's returns (e.g., by stating that the information provides some indication of the risks of investing in th e Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for 1, 5, and 10 years compare with those of a broad measure of market performance). Provide a statement to the effect that the Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse147false0rr_BarChartHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="center"><font style="font-size: 11pt;" class="_mt"><b>Investor A Shares<br />ANNUAL TOTAL RETURNS<br />BlackRock High Income Fund<br />As of 12/31</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse148false0rr_BarChartDoesNotReflectSalesLoadsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInclude the bar chart and table required by Item 4 (b)(2)(ii) and (iii) of this section. Provide a brief explanation of how the information illustrates the variability of the Fund's returns (e.g., by stating that the information provides some indication of the risks of investing in the Fund by showing changes in the Fund's perf ormance from year to year and by showing how the Fund's average annual returns for 1, 5, and 10 years compare with those of a broad measure of market performance). Provide a statement to the effect that the Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Provide annual total returns beginning with the earliest calendar year. Calculate annual returns using the Instructions to Item 8(a), except that the calculations should be based on calendar years. If a Fund's shares are sold subject to a sales load or account fees, state that sales loads or account fees are not reflected in the bar chart and that, if these amounts were reflected, returns would be less than those shown.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse149false0rr_BarChartClosingTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsef alse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">During the ten-year period shown in the bar chart, the&nbsp;<font class="_mt">highest return</font> for a quarter was&nbsp;<font class="_mt">20.39%</font> (quarter ended June 30, 2009) and the&nbsp;<font class="_mt">lowest return</font> for a quarter was&nbsp;<font class="_mt">-23.78%</font> (quarter ended December 31, 2008).</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIf the Fund has a nnual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse150false0rr_PerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<b><font style="line-height: 115%; font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">As of 12/31/10<br />Average Annual Total Returns </font></b>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringThis item represents Average Anuual Total Returns. If a Multiple Class Fund offers a Class in the prospectus that converts into another Class after a stated period, compute average annual total returns in the table by using the returns of th e other Class for the period after conversion.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit c -Subsection b falsefalse151false0rr_PerformanceTableDoesReflectSalesLoadsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00However, the table includes all applicable fees and sales charges.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf the Fund has annual returns for at least one calendar year, provide a table showing the Fund's (A) average annual total return; (B) average annual total return (after taxes on distributions); and (C) average annual total return (after taxes on distributions and redemption). A Money Market Fund should show only the returns described in clause (A) of t he preceding sentence. All returns should be shown for 1-, 5-, and 10- calendar year periods ending on the date of the most recently completed calendar year (or for the life of the Fund, if shorter), but only for periods subsequent to the effective date of the Fund's registration statement. The table also shouldshow the returns of an appropriate broadbased securities market index as defined in Instruction 5 to Item 22(b)(7) for the same periods. A Fund that has been in existence for more than 10 years also may include returns for the life of the Fund. A Money Market Fund may provide the Fund's 7-day yield ending on the date of the most recent calendar year or disclose a toll-free (or collect) telephone number that investors can use to obtain the Fund's current 7-day yield. For a Fund (other than a Money Market Fund or a Fund described in General Instruction C.3.(d)(iii)), provide the information in the following table with the specified captions AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31 , _____)Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Subsection b falsefalse152false0rr_PerformanceTableUsesHighestFederalRaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font style="font-family: 'Arial','sans-serif'; font-size: 10pt;" class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes.&nbsp;</font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringProvide a brief explanation that after-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Subsection b falsefalse153false0rr_PerformanceTableNotRelevantToTaxDeferredrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts ("IRAs").falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringProvide a brief explanation that the actual after-tax returns depend on an investor's tax situation and may differ from t hose shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iv -Clause B -Subsection b falsefalse154false0rr_PerformanceTableOneClassOfAfterTaxShownrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00After-tax returns are shown for Investor A Shares only, and the after-tax returns for Investor B, Investor C and Institutional Shares will vary.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringProvide a brief explanation that if the Fund is a Multiple Class Fund that offers more than one Class in the prospectus, after-tax returns are shown for only one Class and after-tax returns for other Classes will vary.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Subsection b Reference 2: 2 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iv -Clause C -Subsection b falsefalse155false0rr_PerformanceTableNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p style="font-family: 'Times New Roman','serif'; margin-left: 0in; font-size: 12pt; margin-right: 0in;"><font style="font-family: 'Arial','sans-serif'; font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-family: 'Arial','sans-serif'; font-size: 10pt;" class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes.&nbsp;</font></font><font class="_mt">Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts ("IRAs").</font> <font class="_mt">After-tax returns are shown for Investor A Shares only, and the after-tax returns for Investor B, Investor C and Institutional Shares will vary.</font></font></p>& lt;/div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIf the Fund has annual returns for at least one calendar year, provide a table showing the Fund's (A) average annual total return; (B) average annual total return (after taxes on distributions); and (C) average annual total return (after taxes on distributions and redemption). A Money Market Fund should show only the returns described in clause (A) of the preceding sentence. All returns should be shown for 1-, 5-, and 10- calendar year periods ending on the date of the most recently completed calen dar year (or for the life of the Fund, if shorter), but only for periods subsequent to the effective date of the Fund's registration statement. The table also shouldshow the returns of an appropriate broadbased securities market index as defined in Instruction 5 to Item 22(b)(7) for the same periods. A Fund that has been in existence for more than 10 years also may include returns for the life of the Fund. A Money Market Fund may provide the Fund's 7-day yield ending on the date of the most recent calendar year or disclose a toll-free (or collect) telephone number that investors can use to obtain the Fund's current 7-day yield. For a Fund (other than a Money Market Fund or a Fund described in General Instruction C.3.(d)(iii)), provide the information in the following table with the specified captions AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, _____). For a Fund that provides annual total returns for only one calendar year or for a Fund that does not include the bar chart because it does not have annual returns for a full calendar year, modify, as appropriate, the narrative explanation required by paragraph (c)(2)(i) (e.g., by stating that the information gives some indication of the risks of an investment in the Fund by comparing the Fund's performance with a broad measure of market performance).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iv -Subsection b falsefalse156false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse9falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : Inv Ins Member {dei_LegalEntityAxis} : S000004072 Member {rr_PerformanceMeasureAxis} : Barclays Capital U S Corporate High Yield2 Issuer Capped Index Member 1/28/2011 - 1/28/2011 Duration_1_28_2011_To_1_28_201126http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberfalsefalseBarclays Capital U.S. Corporate High Yield 2% Issuer Capped Index (Reflects no deduction for fees, expenses or taxes)rr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_BarclaysCapitalUSCorporateHighYield2IssuerCappedIndexMemberrr_PerformanceMeasureAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalse157true0 rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse158false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.14940.1494falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse159false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 0890.089falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse160false0rr_AverageAnnualReturnYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0 .09010.0901falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse161false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse10falsefalseUSDtruefalse{dei_DocumentInformationDocumentAxis} : Inv Ins Member {dei_LegalEntityAxis} : S000004071 Member {rr_ProspectusShareClassAxis} : C000011387 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_201111http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAx isxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor Arr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011387Memberrr_ProspectusShareClassAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse162true0r r_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse163false0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.040.04falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage . Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalse164false0rr_MaximumDeferredSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1true< /IsNumeric>truetrue00[4]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) b ased on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalse165false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00440.0044[5],[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse166false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00250.0025[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalse167false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00730.0073[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other E xpenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions falsefalse168false0rr_Component1OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue< NumericAmount>0.00460.0046[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse169false0rr_Component2OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00270.0027[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 10 -Subsection table falsefalse170false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.01420.0142[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions falsefalse171false0rr_FeeWaiverOrReimbursementOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetr ue-0.0007-0.0007[5],[6]falsefalsefalsefalsefalseOtherrr:NonPositivePure4TypepureTotal Annual Fund Operating Expenses. If there were expense reimbursement or fee waiver arrangements that reduced any Fund operating expenses and will continue to reduce them for no less than one year from the effective date of the Fund's registration statement, a Fund may add two captions to the table one caption showing the amount of the expense reimbursement or fee waiver, and a second capt ion showing the Fund's net expenses after subtracting the fee reimbursement or expense waiver from the total fund operating expenses. The Fund should place these additional captions directly below the "Total Annual Fund Operating Expenses" caption of the table and should use appropriate descriptive captions, such as "Fee Waiver [and/or Expense Reimbursement]" and "Total Annual Fund Operating Expenses After Fee Waiver [and/or Expense Reimbursement]," respectively. If the Fund provides this disclosure, also disclose the period for which the expense reimbursement or fee waiver arrangement is expected to continue, and briefly describe who can terminate the arrangement and under what circumstances.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse172false0rr_NetExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.01350.0135[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse173false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue532532falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse174false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue811811falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse175false0rr_ExpenseExampleYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue11101110falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse176false0rr_ExpenseExampleYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue19591959falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse177false0rr_AnnualReturn2002rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.08570.0857falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return informatio n as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse178false0rr_AnnualReturn2003rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.04240.0424falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalse179false0rr_AnnualReturn2004rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.04060.0406falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalse180false0rr_AnnualReturn2005rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.02070.0207falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse181false0rr_AnnualReturn2006rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.03790.0379falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse182false0rr_AnnualReturn2007rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.04770.0477falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalse183false0rr_AnnualReturn2008rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.1152-0.1152falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date retur n information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse184false0rr_AnnualReturn2009rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.15840.1584falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalse185false0rr_AnnualReturn2010rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.0970.097falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return in formation as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse186false0rr_HighestQuarterlyReturnLabelrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 00highest returnfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar y ear, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse187false0rr_BarChartHighestQuarterlyReturnDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 002009-09-30falsefalsetruefalsefalseOtherxbrli:dateItemTypedateIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse188false0rr_BarChartHighestQuarterlyReturnrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.07120.0712falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, includ e the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse189false0rr_LowestQuarterlyReturnLabelrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00lowest returnfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calend ar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse190false0rr_BarChartLowestQuarterlyReturnDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse002008-09-30falsefalsetruefalsefalseOtherxbrli:dateItemTypedateIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a c alendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse191false0rr_BarChartLowestQuarterlyReturnrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.0697-0.0697falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, includ e the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse192false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue 0.05310.0531falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse193false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 03260.0326falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse194false0rr_AverageAnnualReturnSinceInceptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.03980.0398falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse195false0rr_AverageAnnualReturnInceptionDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse002001-12-07falsefalsetruefalsefalseOtherxbrli:dateItemTypedateReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 4 -Subsection b falsefalse196false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse11falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : Inv Ins Member {dei_LegalEntityAxis} : S000004071 Member {rr_ProspectusShareClassAxis} : C000011387 Member {rr_PerformanceMeasureAxis} : Return After Taxes on Distributions 1/28/2011 - 1/28/2011 Duration_1_28_2011_To_1_28_201118http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor Arr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011387Memberrr_ProspectusShareClassAxisexplicitMemberfalsefalseReturn After Taxes on Distributionsrr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldirr_AfterTaxesOnDistributionsMember rr_PerformanceMeasureAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalse197true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse198false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.03820.0382falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse199false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 01510.0151falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse200false0rr_AverageAnnualReturnSinceInceptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.02210.0221falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse201false0rr_AverageAnnualReturnInceptionDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse002001-12-07falsefalsetruefalsefalseOtherxbrli:dateItemTypedateReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 4 -Subsection b falsefalse202false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse12falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : Inv Ins Member {dei_LegalEntityAxis} : S000004071 Member {rr_ProspectusShareClassAxis} : C000011387 Member {rr_PerformanceMeasureAxis} : Return After Taxes on Distributions and Sale of Shares 1/28/2011 - 1/28/2011 Duration_1_28_2011_To_1_28_201193http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor Arr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011387Memberrr_ProspectusShareClassAxisexplicitMemberfalsefalseReturn After Taxes on Distributions and Sale of Sharesrr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldirr_AfterTaxesOn DistributionsAndSalesMemberrr_PerformanceMeasureAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalse203true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse204false0rr_AverageAnnualReturnYear01rrfalsenadurati onNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.03430.0343falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse205false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 01730.0173falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse206false0rr_AverageAnnualReturnSinceInceptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.02330.0233falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse207false0rr_AverageAnnualReturnInceptionDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse002001-12-07falsefalsetruefalsefalseOtherxbrli:dateItemTypedateReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 4 -Subsection b falsefalse208false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse13falsefalseUSDtruefalse{dei_DocumentInformationDocumentAxis} : Inv Ins Member {dei_LegalEntityAxis} : S000004071 Member {rr_ProspectusShareClassAxis} : C000011388 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_201114http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAx isxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor Brr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011388Memberrr_ProspectusShareClassAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse209true0r r_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse210false0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalse211false0rr_MaximumDeferredSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1true< /IsNumeric>truetrue0.040.04[7]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (l oad) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalse212false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00440.0044[5],[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse213false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00750.0075[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalse214false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00890.0089[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other E xpenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions falsefalse215false0rr_Component1OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue< NumericAmount>0.00460.0046[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse216false0rr_Component2OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00430.0043[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 10 -Subsection table falsefalse217false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.02080.0208[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions falsefalse218false0rr_FeeWaiverOrReimbursementOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetr ue-0.0007-0.0007[5],[6]falsefalsefalsefalsefalseOtherrr:NonPositivePure4TypepureTotal Annual Fund Operating Expenses. If there were expense reimbursement or fee waiver arrangements that reduced any Fund operating expenses and will continue to reduce them for no less than one year from the effective date of the Fund's registration statement, a Fund may add two captions to the table one caption showing the amount of the expense reimbursement or fee waiver, and a second capt ion showing the Fund's net expenses after subtracting the fee reimbursement or expense waiver from the total fund operating expenses. The Fund should place these additional captions directly below the "Total Annual Fund Operating Expenses" caption of the table and should use appropriate descriptive captions, such as "Fee Waiver [and/or Expense Reimbursement]" and "Total Annual Fund Operating Expenses After Fee Waiver [and/or Expense Reimbursement]," respectively. If the Fund provides this disclosure, also disclose the period for which the expense reimbursement or fee waiver arrangement is expected to continue, and briefly describe who can terminate the arrangement and under what circumstances.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse219false0rr_NetExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.02010.0201[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse220false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue604604falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse221false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue930930falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse222false0rr_ExpenseExampleYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue12831283falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse223false0rr_ExpenseExampleYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue23382338falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse224false0rr_ExpenseExampleNoRedemptionYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetr ue204204falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse225false0rr_ExpenseExampleNoRedemptionYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue 630630falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse226false0rr_ExpenseExampleNoRedemptionYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetru e10831083falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subparagraph f -Subsection instructions falsefalse227false0rr_ExpenseExampleNoRedemptionYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetru e23382338falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subparagraph f -Subsection instructions falsefalse228false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue 0.05050.0505falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse229false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 03140.0314falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse230false0rr_AverageAnnualReturnSinceInceptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.03870.0387falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse231false0rr_AverageAnnualReturnInceptionDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse002001-12-07falsefalsetruefalsefalseOtherxbrli:dateItemTypedateReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 4 -Subsection b falsefalse232false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse14falsefalseUSDtruefalse{dei_DocumentInformationDocumentAxis} : Inv Ins Member {dei_LegalEntityAxis} : S000004071 Member {rr_ProspectusShareClassAxis} : C000037620 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_201117http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAx isxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor Crr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000037620Memberrr_ProspectusShareClassAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse233true0r r_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse234false0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalse235false0rr_MaximumDeferredSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1true< /IsNumeric>truetrue0.010.01[8]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (l oad) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalse236false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00440.0044[5],[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse237false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.010.01[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalse238false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.0080.008[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Exp enses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions falsefalse239false0rr_Component1OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue< NumericAmount>0.00460.0046[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse240false0rr_Component2OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00340.0034[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 10 -Subsection table falsefalse241false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.02240.0224[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions falsefalse242false0rr_FeeWaiverOrReimbursementOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetr ue-0.0013-0.0013[5],[6]falsefalsefalsefalsefalseOtherrr:NonPositivePure4TypepureTotal Annual Fund Operating Expenses. If there were expense reimbursement or fee waiver arrangements that reduced any Fund operating expenses and will continue to reduce them for no less than one year from the effective date of the Fund's registration statement, a Fund may add two captions to the table one caption showing the amount of the expense reimbursement or fee waiver, and a second capt ion showing the Fund's net expenses after subtracting the fee reimbursement or expense waiver from the total fund operating expenses. The Fund should place these additional captions directly below the "Total Annual Fund Operating Expenses" caption of the table and should use appropriate descriptive captions, such as "Fee Waiver [and/or Expense Reimbursement]" and "Total Annual Fund Operating Expenses After Fee Waiver [and/or Expense Reimbursement]," respectively. If the Fund provides this disclosure, also disclose the period for which the expense reimbursement or fee waiver arrangement is expected to continue, and briefly describe who can terminate the arrangement and under what circumstances.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse243false0rr_NetExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.02110.0211[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse244false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue314314falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse245false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue673673falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse246false0rr_ExpenseExampleYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue11591159falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse247false0rr_ExpenseExampleYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue24492449falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse248false0rr_ExpenseExampleNoRedemptionYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetr ue214214falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse249false0rr_ExpenseExampleNoRedemptionYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue 673673falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse250false0rr_ExpenseExampleNoRedemptionYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetru e11591159falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subparagraph f -Subsection instructions falsefalse251false0rr_ExpenseExampleNoRedemptionYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetru e24992499falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subparagraph f -Subsection instructions falsefalse252false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue 0.0810.081falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse253false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 03440.0344falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse254false0rr_AverageAnnualReturnSinceInceptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.03740.0374falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse255false0rr_AverageAnnualReturnInceptionDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse002001-12-07falsefalsetruefalsefalseOtherxbrli:dateItemTypedateReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 4 -Subsection b falsefalse256false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse15falsefalseUSDtruefalse{dei_DocumentInformationDocumentAxis} : Inv Ins Member {dei_LegalEntityAxis} : S000004071 Member {rr_ProspectusShareClassAxis} : C000011390 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_201115http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAx isxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseInstitutionalrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011390Memberrr_ProspectusShareClassAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit 1Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse257true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse258false0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalse< IsEquityPrevioslyReportedAsRow>falsefalsefalsefalsefalse1truetruetrue00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percent age. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalse259false0rr_MaximumDeferredSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1true< /IsNumeric>truetrue00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset v alue at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalse260false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00440.0044[5],[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse261false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalse262false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.0070.007[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Exp enses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions falsefalse263false0rr_Component1OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue< NumericAmount>0.00460.0046[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse264false0rr_Component2OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00240.0024[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 10 -Subsection table falsefalse265false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.01140.0114[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions falsefalse266false0rr_FeeWaiverOrReimbursementOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetr ue-0.0013-0.0013[5],[6]falsefalsefalsefalsefalseOtherrr:NonPositivePure4TypepureTotal Annual Fund Operating Expenses. If there were expense reimbursement or fee waiver arrangements that reduced any Fund operating expenses and will continue to reduce them for no less than one year from the effective date of the Fund's registration statement, a Fund may add two captions to the table one caption showing the amount of the expense reimbursement or fee waiver, and a second capt ion showing the Fund's net expenses after subtracting the fee reimbursement or expense waiver from the total fund operating expenses. The Fund should place these additional captions directly below the "Total Annual Fund Operating Expenses" caption of the table and should use appropriate descriptive captions, such as "Fee Waiver [and/or Expense Reimbursement]" and "Total Annual Fund Operating Expenses After Fee Waiver [and/or Expense Reimbursement]," respectively. If the Fund provides this disclosure, also disclose the period for which the expense reimbursement or fee waiver arrangement is expected to continue, and briefly describe who can terminate the arrangement and under what circumstances.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse267false0rr_NetExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.01010.0101[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse268false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue103103falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse269false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue334334falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse270false0rr_ExpenseExampleYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue584584falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse271false0rr_ExpenseExampleYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue13001300falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse272false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue 0.10030.1003falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse273false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 04420.0442falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse274false0rr_AverageAnnualReturnSinceInceptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.04760.0476falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse275false0rr_AverageAnnualReturnInceptionDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse002001-12-07falsefalsetruefalsefalseOtherxbrli:dateItemTypedateReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 4 -Subsection b falsefalse276false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse16falsefalseUSDtruefalse{dei_DocumentInformationDocumentAxis} : Inv Ins Member {dei_LegalEntityAxis} : S000004071 Member {rr_ProspectusShareClassAxis} : C000011391 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_201116http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAx isxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Rrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011391Memberrr_ProspectusShareClassAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse277true0rr_RiskRet urnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse278false0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.ins tructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the perc entage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalse279false0rr_MaximumDeferredSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1true< /IsNumeric>truetrue00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset v alue at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalse280false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00440.0044[5],[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse281false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.0050.005[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalse282false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00840.0084[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other E xpenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions falsefalse283false0rr_Component1OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue< NumericAmount>0.00460.0046[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse284false0rr_Component2OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00380.0038[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 10 -Subsection table falsefalse285false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.01780.0178[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions falsefalse286false0rr_FeeWaiverOrReimbursementOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetr ue-0.0022-0.0022[5],[6]falsefalsefalsefalsefalseOtherrr:NonPositivePure4TypepureTotal Annual Fund Operating Expenses. If there were expense reimbursement or fee waiver arrangements that reduced any Fund operating expenses and will continue to reduce them for no less than one year from the effective date of the Fund's registration statement, a Fund may add two captions to the table one caption showing the amount of the expense reimbursement or fee waiver, and a second capt ion showing the Fund's net expenses after subtracting the fee reimbursement or expense waiver from the total fund operating expenses. The Fund should place these additional captions directly below the "Total Annual Fund Operating Expenses" caption of the table and should use appropriate descriptive captions, such as "Fee Waiver [and/or Expense Reimbursement]" and "Total Annual Fund Operating Expenses After Fee Waiver [and/or Expense Reimbursement]," respectively. If the Fund provides this disclosure, also disclose the period for which the expense reimbursement or fee waiver arrangement is expected to continue, and briefly describe who can terminate the arrangement and under what circumstances.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse287false0rr_NetExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.01560.0156[6]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse288false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue159159falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse289false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue524524falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse290false0rr_ExpenseExampleYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue914914falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse291false0rr_ExpenseExampleYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue20072007falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse292false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue 0.0940.094falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse293false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 03860.0386falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse294false0rr_AverageAnnualReturnSinceInceptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.0420.042falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse295false0rr_AverageAnnualReturnInceptionDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse002001-12-07falsefalsetruefalsefalseOtherxbrli:dateItemTypedateReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 4 -Subsection b falsefalse296false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse17falsefalseUSDtruefalse{dei_DocumentInformationDocumentAxis} : Inv Ins Member {dei_LegalEntityAxis} : S000004071 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_20113http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxi sxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse297true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse2 98false0rr_RiskReturnHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 14pt;" class="_mt"><b><i>Key Facts about BlackRock Total Return Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Investment Objectives/Goals Include the following information, in plain English under rule 421(d) under the Securities Act, in the order and subject matter indicatedReference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 falsefalse299false0rr_ObjectiveHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div><font class="_mt"> </font> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Investment Objective</i></b></font></p><font class="_mt"> </font></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse300false0rr_ObjectivePrimaryTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse< NumericAmount>00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The investment objective of the BlackRock Total Return Fund (the "Total Return Fund" or the "Fund") is to realize a total return that exceeds that of the Barclays Capital U.S. Aggregate Bond Index.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse301false0rr_ExpenseHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Fees and Expenses of the Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Fee Table Includes the following information, in plain English under rule 421(d) under the Securities Act, after Item 2 Fees and expenses of the Fund This table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to inve st in the future, at least $[_____] in [name of fund family] funds. Shareholder Fees (fees paid directly from your investment) 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 you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be You would pay the following expenses if you did not redeem your shares The Example does not reflect sales charges (loads) on reinvested dividends [and other distributions]. If these sales charges (loads) were included, your costs would be higher. Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its po rtfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was __% of the average value of its whole portfolio. Instructions. A.3.instructions.6 New Funds. For purposes of this Item, a "New Fund" is a Fund that does not include in Form N-1A financial statements reporting operating results or that includes financial statements for the Fund's initial fiscal year reporting operating results for a period of 6 months or less. The following Instructions apply to New Funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph d -Subsection instructions falsefalse302false0rr_ExpenseNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.&nbsp;<font class="_mt">You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least <font class="_mt">$25,000 </font>in the BlackRock-advised fund complex.</font> More information about these and other discounts is available from your financial professional and in the "Details about the Share Classes" section on page 27 of the Fund's prospectus and in the "Purchase of Shares" section on page II-67 of the Fund's statement of additional information.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThis table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $[_____] in [name of fund family] funds. Include the narrative explanations in the order indicated. A Fund may modify the narrative explanations if the explanation contains comparable information to that shown.The narrative explanation regarding sales charge discounts is only required by a Fund that offers such discounts and should specify the minimum level of investment required to qualify for a discount. Modify the narrative explanation to state that Fund shares are sold on a national securities exchange at the end of the time periods indicated, and that brokerage commi ssions for buying and selling Fund shares through a broker are not reflected.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph b -Subsection instructions falsefalse303false0rr_ShareholderFeesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <p style="line-height: normal; margin: 0in 0in 0pt; font-family: 'Calibri','sans-serif'; font-size: 11pt;" class="MsoNormal"><b><font style="font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">Shareholder Fees <br />(fees paid directly from your investment)</font></b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringShareholder Fees (fees paid directly from your investment).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subsection table falsefalse304false0rr_OperatingExpensesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"><font style="line-height: 115%; font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt"><strong>Annual Fund Operating Expenses<br />(expenses that you pay each year as a <br />percentage of the value of your investment)</strong></font></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringAnnual Fund Operating Expenses (ongoing expenses that you pay each year as a percentage of the value of your investment)Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 7 -Subsection table falsefalse305false0rr_FeeWaiverOrReimbursementOverAssetsDateOfTerminationrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00February 1, 2012falsefalsefalsefalsefalseOtherus-types:dateStringItemTypenormalizedstringThis element represents the date of expected termination of any expense reimbursement or fee waiver arrangements that reduce any Fund operating expenses (SEC Form N-1A 2006-09-14 A.3.table.1.11 Total Annual Fund Operating Expenses A.3.instructions.3.e).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph e -Subsection instructions falsefalse306false0rr_PortfolioTurnoverHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"><font style="font-size: 11pt;" class="_mt"><strong>Portfolio Turnover</strong> </font></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fis cal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 5 -Subsection instructions falsefalse307false0rr_PortfolioTurnoverTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was&nbsp;<font class="_mt">1,754%</font> of the average value of its portfolio.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subsection example falsefalse308false0rr_PortfolioTurnoverRaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse17.5417.54falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureThis element represents the rate of portfolio turnover presented as a percentage (SEC Form N-1A 2006-09-14 A.3.example.3 Portfolio Turnover A.3.instructions.5 Portfolio Turnover).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subsection example falsefalse309false0rr_ExpenseBreakpointDiscountsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least <font class="_mt">$25,000 </font>in the BlackRock-advised fund complex.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInclude the narrative explanations in the order indicated. A Fund may modify the narrative explanations if the explanation contains comparable information to that shown.The narrative explanation regarding sales charge discounts is on ly required by a Fund that offers such discounts and should specify the minimum level of investment required to qualify for a discount.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph b -Subsection instructions falsefalse310false0rr_ExpenseBreakpointMinimumInvestmentRequiredAmountrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse2500025000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis element represents the minimum level of investment required to qualify for discounted sales charges or fund expenses (SEC Form N-1A 2006-09-14 A.3.instructions.1.b).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph b -Subsection instructions falsefalse311false0rr_ExpenseExampleHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font style="font-size: 11pt;" class="_mt"><strong>Example:</strong></font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringHeading for Expense Example.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse312false0rr_ExpenseExampleNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">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:</font></p></div> </div>falsefalsefalsefalsefalseOtherus-t ypes:textBlockItemTypestringThe Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection example falsefalse313false0rr_ExpenseExampleNoRedemptionByYearCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">You would pay the following expenses if you did not redeem your shares:</font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse314false0rr_StrategyHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalse false00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><strong><em>Principal Investment Strategies of the Fund</em></strong></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a partic ular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse315false0rr_StrategyNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse< NumericAmount>00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The Total Return Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font></font></font></font></font></font>Both U.S. and foreign companies and governments may issue these securities.&nbsp;<font class="_mt">Under normal circumstances, the Total Return Fund invests at least 80% of its assets in bonds and invests primarily in investment grade fixed-income securities.</font> The Total Return Fund may invest in fixed-income securities of any duration or maturity.& lt;/font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Total Return Fund will invest most of its assets in securities issued by U.S. issuers, but may also invest a portion of its assets in securities issued by foreign issuers. The Total Return Fund may also invest in derivative securities for hedging purposes or to increase the return on its investments. The Total Return Fund may also enter into dollar rolls.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Total Return Fund may invest up to 20% of its net assets in fixed-income securities that are rated below investment grade by at least one of the recognized rating agencies or in unrated securities of equivalent credit quality.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Total Return Fund is a "feeder" fund that invests all of its assets in a corresponding "master" portfolio, the Master Total Return Portfolio ("Master Portfolio"), a series of the Master Bond LLC ("Master LLC"), a mutual fund that has the same investment objectives and strategies as the Total Return Fund. All investments will be made at the level of the Master Portfolio. This structure is sometimes called a "master/feeder" structure. The Total Return Fund's investment results will correspond directly to the investment results of the underlying Master Portfolio in which it invests. For simplicity, this Prospectus uses the term "Total Return Fund" and "Fund" to include the Master Portfolio.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse316false0rr_StrategyPortfolioConcentrationrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The Total Return Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font></font></font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse317false0rr_RiskHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Risks of Investing in the Fund</i></b><br /><br /></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNarrative Risk Disclosure.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subsection b falsefalse318false0rr_RiskNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time.&nbsp;<font class="_mt">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.</font> The following is a summary description of certain risks of investing in the Fund.<br /><br /></font></p> <ul> <li><font style="font-size: 10pt;" class="_mt"><b><i>Credit Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Credit risk refers to the possibility that the issuer of a security will not be able to make payments of interest and principal when due. Changes in an issuer's credit rating or the market's perception of an issuer's creditworthiness may also affect the value of the Fund's investment in that issuer.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Derivatives Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund's use of derivatives may reduce the Fund's returns and/or increase volatility. Volatility is defined as the characteristic of a security, an index or a market to fluctuate significantly in price within a short time period. Derivatives are also subject to counterparty risk, which is the risk that the other party in the transaction will not fulfill its contractual obligation. A risk of the Fund's use of derivatives is that the fluctuations in their values may not correlate perfectly with the overall securities markets. The possible lack of a liquid secondary market for derivatives and the resulting inability of the Fund to sell or otherwise close a derivatives position could expose the Fund to losses and could make derivatives more difficult for the Fund to value accurately. Derivatives may give rise to a form of lev erage and may expose the Fund to greater risk and increase its costs.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Dollar Rolls Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Dollar rolls involve the risk that the market value of the securities that the Fund is committed to buy may decline below the price of the securities the Fund has sold. These transactions may involve leverage.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Extension Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates rise, certain obligations will be paid off by the obligor more slowly than anticipated, causing the value of these securities to fall.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Foreign Securities Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include:<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Changes in foreign currency exchange rates can affect the value of the Fund's portfolio.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Settlement and clearance procedures in certain foreign markets may result in delays in payment for or delivery of securities not typically associated with settlement and clearance of U.S. investments.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>High Portfolio Turnover Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund may engage in active and frequent trading of its portfolio securities. High portfolio turnover (more than 100%) may result in increased transaction costs to the Fund, including brokerage commissions, dealer mark-ups and other transaction costs on the sale of the securities and on reinvestment in other securities. The sale of Fund portfolio securities may result in the realization and/or distribution to shareholders of higher capital gains or losses as compared to a fund with less active trading policies. Given the frequency of sales, such gain or loss will likely be short-term capital gain or loss and, in the event of a gain, would increase an investor's tax liability unless shares are held through a tax-deferred or exempt vehicle. These effects of higher than normal portfolio turnover may adversely aff ect Fund performance. In addition, investment in mortgage dollar rolls and participation in TBA transactions may significantly increase the Fund's portfolio turnover rate. A TBA transaction is a method of trading mortgage-backed securities where the buyer and seller agree upon general trade parameters such as agency, settlement date, par amount, and price.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Interest Rate Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Interest rate risk is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall, and decrease as interest rates rise.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Junk Bonds Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Although junk bonds generally pay higher rates of interest than investment grade bonds, junk bonds are high risk investments that may cause income and principal losses for the Fund.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Market Risk and Selection Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Mortgage- and Asset-Backed Securities Risks</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Mortgage- and asset-backed securities represent interests in "pools" of mortgages or other assets, including consumer loans or receivables held in trust. Mortgage- and <font style="font-size: 10pt;" class="_mt">asset-backed securities are subject to credit, interest rate, prepayment and extension risks. These securities also are subject to risk of default on the underlying mortgage or asset, particularly during periods of economic downturn. Small movements in interest rates (both increases and decreases) may quickly and significantly reduce the value of certain mortgage-backed securities.<br /><br /></font></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Prepayment Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates fall, certain obligations will be paid off by the obligor more quickly than originally anticipated, and the Fund may have to invest the proceeds in securities with lower yields.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Sovereign Debt Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Sovereign debt instruments are subject to the risk that a governmental entity may delay or refuse to pay interest or repay principal on its sovereign debt, due, for example, to cash flow problems, insufficient foreign currency reserves, political considerations, the relative size of the governmental entity's debt position in relation to the economy or the failure to put in place economic reforms required by the International Monetary Fund or other multilateral agencies.<br /><br /></font></li></ul></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringNarrative Risk Disclosure. A Fund may, in responding to this Item, describe the types of investors for whom the Fund is intended or the types of investment goals that may be consistent with an investment in the Fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph i -Clause instruction -Subsection b falsefalse319false0rr_RiskLoseMoneyrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringSummarize the principal risks of investing in the Fund, including the risks to which the Fund's portfolio as a whole is subject and the circumstances reasonably likely to affect adversely the Fund's net asset value, yield, and total return. Unless the Fund is a Money Market Fund, disclose that loss of money is a r isk of investing in the Fund. A Fund may, in responding to this Item, describe the types of investors for whom the Fund is intended or the types of investment goals that may be consistent with an investment in the Fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph i -Subsection b falsefalse320false0rr_BarChartAndPerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 12pt;" class="_mt"><strong><em>Performance Information</em></strong> </font></font></font></font></font></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse321false0rr_PerformanceNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalse false00<div> <div class="MetaData"><font style="font-size: 12pt;" class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 12pt;" class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font></font></font></font></font>The table compares the Fund's performance to that of the Barclays Capital U.S. Aggregate Bond Index. Effective September 24, 2007, the Total Return Fund reorganized with BlackRock Total Return Portfolio (the "Predecessor Fund"), a series of BlackRock Funds II (the "Reorganization"), and the Predecessor Fund's performance and financial history has been adopte d by the Total Return Fund and will be used going forward from the date of the Reorganization. The information below is based on the performance information of the combined fund resulting from the Reorganization and that of the Predecessor Fund prior to the Reorganization (adjusted as necessary to reflect the fees applicable to each class of shares). Prior to September 24, 2007, Investor A, Investor B and Institutional Share performance results are those of BlackRock Shares of the Predecessor Fund restated to reflect Investor A, Investor B and Institutional Share fees, respectively. Prior to September 24, 2007, Investor C Share performance results are those of Investor C Shares of a predecessor fund with no adjustments. Prior to October 2, 2006, Class R Share performance results are those of the Class R Shares of the Predecessor Fund. Prior to the Predecessor Fund Class R Shares inception date, the Class R Share performance is based on the performance of the BlackRock Shares of the Predecessor Fund restated to reflect Class R Share fees.&nbsp;<font class="_mt">As with all such investments, past performance (before and after taxes) is not an indication of future results.</font>&nbsp;<font class="_mt">Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.</font>&nbsp;<font class="_mt">However, the table includes all applicable fees and sales charges.</font> If the Fund's investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund's returns would have been lower. Updated information on the Fund's performance can be obtained by visiting&nbsp;<font class="_mt">http://www.blackrock.com/funds</font> or can be obtained by phone at <font class="_mt"><font style="font-size: 10pt;" class="_mt">800-882-0052.</font></font></font> </font> <p>&nbsp;</p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse322false0rr_PerformanceInformationIllustratesVariabilityOfReturnsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font style="font-size: 12pt;" class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font></font></font></font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInclude the bar chart and ta ble required by paragraphs (b)(2)(ii) and (iii) of this section. Provide a brief explanation of how the information illustrates the variability of the Fund's returns (e.g., by stating that the information provides some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for 1, 5, and 10 years compare with those of a broad measure of market performance). Provide a statement to the effect that the Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse323false0rr_PerformanceAvailabilityPhonerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font style="font-size: 10pt;" class="_mt">800-882-0052.</font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf applicable, include a statement explaining that updated performance information is available and providing a Web site address and/or toll-free (or collect) telephone number where the updated information may be obtained.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse324false0rr_PerformanceAvailabilityWebSiteAddressrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00http://www.blackrock.com/fundsfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf applicable, include a statement explaining that updated performance information is available and providing a Website address and/or toll-free (or collect) telephone number where the updated information may be obtained.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse325false0rr_PerformancePastDoesNotIndicateFuturerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00As with all such investments, past performance (before and after taxes) is not an indication of future results.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInclude the bar chart and table required by paragraphs (b)(2)(ii) and (iii) of this section. Provide a brief explanation of how the information illustrates the variability of the Fund's returns (e.g., by stating that the information provides some indication of the risks of investing in th e Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for 1, 5, and 10 years compare with those of a broad measure of market performance). Provide a statement to the effect that the Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse326false0rr_BarChartHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="center"><font style="font-size: 11pt;" class="_mt"><b>Investor A Shares<br />ANNUAL TOTAL RETURNS<br />BlackRock Total Return Fund<br />As of 12/31</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse327false0rr_BarChartDoesNotReflectSalesLoadsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInclude the bar chart and table required by Item 4 (b)(2)(ii) and (iii) of this section. Provide a brief explanation of how the information illustrates the variability of the Fund's returns (e.g., by stating that the information provides some indication of the risks of investing in the Fund by showing changes in the Fund's perf ormance from year to year and by showing how the Fund's average annual returns for 1, 5, and 10 years compare with those of a broad measure of market performance). Provide a statement to the effect that the Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Provide annual total returns beginning with the earliest calendar year. Calculate annual returns using the Instructions to Item 8(a), except that the calculations should be based on calendar years. If a Fund's shares are sold subject to a sales load or account fees, state that sales loads or account fees are not reflected in the bar chart and that, if these amounts were reflected, returns would be less than those shown.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse328false0rr_BarChartClosingTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsef alse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">During the period shown in the bar chart, the&nbsp;<font class="_mt">highest return</font> for a quarter was&nbsp;<font class="_mt">7.12%</font> (quarter ended September 30, 2009) and the <font class="_mt">lowest return </font>for a quarter was&nbsp;<font class="_mt">-6.97%</font> (quarter ended September 30, 2008).</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse329false0rr_PerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><b><font style="font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">As of 12/31/10<br />Average Annual Total Returns</font></b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringThis item represents Average Anuual Total Returns. If a Multiple Class Fund offers a Class in the prospectus that converts into another Class after a stated period, compute average annual total returns in the table by using the returns of the other Class for the period after conversion.< /ElementDefenition>Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit c -Subsection b falsefalse330false0rr_PerformanceTableDoesReflectSalesLoadsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00However, the table includes all applicable fees and sales charges.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf the Fund has annual returns for at least one calendar year, provide a table showing the Fund's (A) average annual total return; (B) average annual total return (after taxes on distributions); and (C) average annual total return (after taxes on distributions and redemption). A Money Market Fund should show only the returns described in clause (A) of t he preceding sentence. All returns should be shown for 1-, 5-, and 10- calendar year periods ending on the date of the most recently completed calendar year (or for the life of the Fund, if shorter), but only for periods subsequent to the effective date of the Fund's registration statement. The table also shouldshow the returns of an appropriate broadbased securities market index as defined in Instruction 5 to Item 22(b)(7) for the same periods. A Fund that has been in existence for more than 10 years also may include returns for the life of the Fund. A Money Market Fund may provide the Fund's 7-day yield ending on the date of the most recent calendar year or disclose a toll-free (or collect) telephone number that investors can use to obtain the Fund's current 7-day yield. For a Fund (other than a Money Market Fund or a Fund described in General Instruction C.3.(d)(iii)), provide the information in the following table with the specified captions AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31 , _____)Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Subsection b falsefalse331false0rr_PerformanceTableUsesHighestFederalRaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font style="font-size: 10pt;" class="_mt"><font class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes.&nbsp;</font></font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringProvide a brief explanation that after-tax returns are calculated using the historical highest individual federal marginal income ta x rates and do not reflect the impact of state and local taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Subsection b falsefalse332false0rr_PerformanceTableNotRelevantToTaxDeferredrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or IRAs.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringProvide a brief explanation that the actual after-tax returns depend on an investor's tax situation and may differ from those shown, and after-tax returns s hown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iv -Clause B -Subsection b falsefalse333false0rr_PerformanceTableOneClassOfAfterTaxShownrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font class="_mt">After-tax returns are shown for Investor A Shares only, and the after-tax returns for Investor B, Investor C, Institutional and Class R Shares will vary.</font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringProvide a brief explanation that if the Fund is a Multiple Class Fund that offers more than one Class in the prospectus, after-tax returns are shown for only one Class and after-tax returns for other Classes will vary.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Subsection b Reference 2: 2 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iv -Clause C -Subsection b falsefalse334false0rr_PerformanceTableNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes.&nbsp;</font></font></font><font class="_mt">Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or IRAs.</font> </font><font class="_mt"><font class="_mt">After-tax returns are shown for Investor A Shares only, and the after-tax returns for Investor B, Investor C, Institutional and Class R Shares will vary.</font></font></font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIf the Fund has annual returns for at least one calendar year, provide a table showing the Fund's (A) average annual total return; (B) average annual total return (after taxes on distributions); and (C) average annual total return (after taxes on distributions and redemption). A Money Market Fund should show only the returns described in clause (A) of the preceding sentence. All returns should be shown for 1-, 5-, and 10- calendar year periods ending on the date of the most recently completed calendar year (or for the life of the Fund, if shorter), but only for periods s ubsequent to the effective date of the Fund's registration statement. The table also shouldshow the returns of an appropriate broadbased securities market index as defined in Instruction 5 to Item 22(b)(7) for the same periods. A Fund that has been in existence for more than 10 years also may include returns for the life of the Fund. A Money Market Fund may provide the Fund's 7-day yield ending on the date of the most recent calendar year or disclose a toll-free (or collect) telephone number that investors can use to obtain the Fund's current 7-day yield. For a Fund (other than a Money Market Fund or a Fund described in General Instruction C.3.(d)(iii)), provide the information in the following table with the specified captions AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, _____). For a Fund that provides annual total returns for only one calendar year or for a Fund that does not include the bar chart because it does not have annual returns for a full calendar year, modify, as appropriate, the narrative explanation required by paragraph (c)(2)(i) (e.g., by stating that the information gives some indication of the risks of an investment in the Fund by comparing the Fund's performance with a broad measure of market performance).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iv -Subsection b falsefalse335false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse18falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : Inv Ins Member {dei_LegalEntityAxis} : S000004071 Member {rr_PerformanceMeasureAxis} : Barclays Capital U S Aggregate Bond Index Reflects No Deduction For Fees Expenses Or Taxes Member 1/28/2011 - 1/28/2011 Duration_1_28_2011_To_1_28_201124http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseBarclays Capital U.S. Aggregate Bond Index (Reflects no deduction for fees, expenses or taxes)rr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_BarclaysCapitalUSAggregateBondIndexReflectsNoDeductionForFeesExpensesOrTaxesMemberrr_PerformanceMeasureAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalse336true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefa lsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse337false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.06540.0654falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse338false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 0580.058falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse339false0rr_AverageAnnualReturnSinceInceptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.05610.0561falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse340false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse19falsefalseUSDtruefalse{dei_DocumentInformationDocumentAxis} : Service Member {dei_LegalEntityAxis} : S000004072 Member {rr_ProspectusShareClassAxis} : C000011394 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_20119http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseServicedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_ServiceMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxi sxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor C1 Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011394Memberrr_ProspectusShareClassAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0U nit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse341true0< /Level>rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00f alsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse342false0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefals efalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumula tive percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalse343false0rr_MaximumDeferredSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1true< /IsNumeric>truetrue0.010.01[9]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (l oad) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalse344false0rr_RedemptionFeeOverRedemptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truetruetrue0.020.02falsefalsefalsefalsefalseOtherrr:NonPositivePure4Typepure"Redemption Fee" (as a percentage of amount redeemed, if applicable) If the Fund is an Exchange-Traded Fund and issues or redeems shares in creation units of not less than 25,000 shares each, exclude any fees charged for the purchase and redemption of the Fund's creation units. "Redemption Fee" includes a fee charged for any r edemption of the Fund's shares, but does not include a deferred sales charge (load) imposed upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph b -Subsection instructions falsefalse345false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetr uetrue0.00420.0042falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse346false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.0080.008falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Refere nce 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalse347false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00370.0037falsefalsefalsefalsefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not inc lude extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions falsefalse348false0rr_Component1OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue< NumericAmount>0.00010.0001falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse349false0rr_Component2OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00360.0036falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 10 -Subsection table falsefalse350false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.01590.0159falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fu nd, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions falsefalse351false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue262262falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse352false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue502502falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse353false0rr_ExpenseExampleYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue866866falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse354false0rr_ExpenseExampleYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue18891889falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse355false0rr_ExpenseExampleNoRedemptionYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetr ue162162falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse356false0rr_ExpenseExampleNoRedemptionYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue 502502falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse357false0rr_ExpenseExampleNoRedemptionYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetru e866866falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subparagraph f -Subsection instructions falsefalse358false0rr_ExpenseExampleNoRedemptionYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetru e18891889falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subparagraph f -Subsection instructions falsefalse359false0rr_AnnualReturn2001rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.0083< /NumericAmount>-0.0083falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return informat ion as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse360false0rr_AnnualReturn2002rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.0337-0.0337falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date retur n information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse361false0rr_AnnualReturn2003rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.31340.3134falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalse362false0rr_AnnualReturn2004rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.11020.1102falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalse363false0rr_AnnualReturn2005rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.00540.0054falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse364false0rr_AnnualReturn2006rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.11710.1171falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse365false0rr_AnnualReturn2007rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.0120.012falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return in formation as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalse366false0rr_AnnualReturn2008rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.3243-0.3243falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date retur n information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse367false0rr_AnnualReturn2009rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.55320.5532falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalse368false0rr_AnnualReturn2010rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.17990.1799falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse369false0rr_HighestQuarterlyReturnLabelrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 00highest returnfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar y ear, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse370false0rr_BarChartHighestQuarterlyReturnDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 002009-06-30falsefalsetruefalsefalseOtherxbrli:dateItemTypedateIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse371false0rr_BarChartHighestQuarterlyReturnrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.20190.2019falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, includ e the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse372false0rr_LowestQuarterlyReturnLabelrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00lowest returnfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calend ar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse373false0rr_BarChartLowestQuarterlyReturnDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse002008-12-31falsefalsetruefalsefalseOtherxbrli:dateItemTypedateIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a c alendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse374false0rr_BarChartLowestQuarterlyReturnrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.2367-0.2367falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, includ e the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse375false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue 0.16990.1699falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse376false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 06960.0696falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse377false0rr_AverageAnnualReturnYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0 .070.07falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse378false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse20falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : Service Member {dei_LegalEntityAxis} : S000004072 Member {rr_ProspectusShareClassAxis} : C000011394 Member {rr_PerformanceMeasureAxis} : Return After Taxes on Distributions 1/28/2011 - 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1/28/2011 Duration_1_28_2011_To_1_28_20117http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseServicedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_ServiceMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.false< /IsTotalLabel>false389true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse0 0falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse390false0rr_RiskReturnHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 30pt;" class="_mt">Fund Overview</font></p> <p align="left"><font style="font-size: 14pt;" class="_mt"><b><i>Key Facts about BlackRock High Income Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Investment Objectives/Goals Include the following information, in plain English under rule 421(d) under the Securities Act, in the order and subject matter indicatedReference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 falsefalse391false0rr_ObjectiveHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Investment Objective</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse392false0rr_ObjectivePrimaryTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse< NumericAmount>00<div> <font style="font-size: 10pt;" class="_mt">The primary investment objective of the BlackRock High Income Fund (the "High Income Fund" or the "Fund") is to provide shareholders with as high a level of current income as is consistent with the investment policies of such Fund. </font> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse393false0rr_ObjectiveSecondaryTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> As a secondary objective, the High Income Fund seeks capital appreciation when consistent with its primary objective. </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse394false0rr_ExpenseHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Fees and Expenses of the Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Fee Table Includes the following information, in plain English under rule 421(d) under the Securities Act, after Item 2 Fees and expenses of the Fund This table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to inve st in the future, at least $[_____] in [name of fund family] funds. Shareholder Fees (fees paid directly from your investment) 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 you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be You would pay the following expenses if you did not redeem your shares The Example does not reflect sales charges (loads) on reinvested dividends [and other distributions]. If these sales charges (loads) were included, your costs would be higher. Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its po rtfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was __% of the average value of its whole portfolio. Instructions. A.3.instructions.6 New Funds. For purposes of this Item, a "New Fund" is a Fund that does not include in Form N-1A financial statements reporting operating results or that includes financial statements for the Fund's initial fiscal year reporting operating results for a period of 6 months or less. The following Instructions apply to New Funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph d -Subsection instructions falsefalse395false0rr_ExpenseNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">This table describes the fees and expenses that you may pay if you buy and hold Investor C1 Shares of the Fund.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThis table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $[_____] in [name of fund family] funds. Include the narrative explanations in the order indicated. A Fund may modify the narrative explanations if the explanation contains comparable information to that shown.The narrative explanation regarding sales charge discounts is only required by a Fund that offers such discounts and should specify the minimum level of investment required to qualify for a discount. Modify the narrative explanation to state that Fund shares are sold on a national securities exchange at the end of the time periods indicated, and that brokerage commissions for buying and selling Fund shares through a broker are not reflected.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph b -Subsection instructions falsefalse396false0rr_ShareholderFeesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="line-height: 115%; margin: 0in 0in 10pt; font-family: 'Calibri','sans-serif'; font-size: 11pt;" class="MsoNormal"><b><font style="line-height: 115%; font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">Shareholder Fees<br />(fees paid directly from your investment)</font></b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringShareholder Fees (fees paid directly from your investment).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subsection table falsefalse397false0rr_OperatingExpensesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font class="_mt"><strong><font size="2" class="_mt">Annual Fund Operating Expenses<br /></font><font style="font-size: 9pt;" class="_mt">(expenses that you pay each year as a percentage of the value of your investment)</font></strong> </font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringAnnual Fund Operating Expenses (ongoing expenses that you pay each year as a percentage of the value of your investment)R eference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 7 -Subsection table falsefalse398false0rr_PortfolioTurnoverHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 11pt;" class="_mt"><b>Portfolio Turnover</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 5 -Subsection instructions falsefalse399false0rr_PortfolioTurnoverTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was&nbsp;<font class="_mt">97%</font> of the average value of its portfolio.</font></p></div> </div>falsefalsefalsefalsefalse Otherus-types:textBlockItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subsection example falsefalse400false0rr_PortfolioTurnoverRaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.970.97falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureThis element represents the rate of portfolio turnover presented as a percentage (SEC Form N-1A 2006-09-14 A.3.example.3 Portfolio Turnover A.3.instructions.5 Portfolio Turnover).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subsection example falsefalse401false0rr_ExpenseExampleHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 00<div class="MetaData"> <p align="left"><font style="font-size: 11pt;" class="_mt"><b>Example:</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringHeading for Expense Example.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse402false0rr_ExpenseExampleNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">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:</font></p></div> </div>falsefalsefalsefalsefalseOtherus-t ypes:textBlockItemTypestringThe Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection example falsefalse403false0rr_ExpenseExampleNoRedemptionByYearCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">You would pay the following expenses if you did not redeem your shares:</font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse404false0rr_StrategyHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalse false00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Investment Strategies of the Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industr y or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse405false0rr_StrategyNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse< NumericAmount>00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The High Income Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font></font>Both U.S. and foreign companies and governments may issue these securities.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">Under normal circumstances, the High Income Fund invests at least 80% of its assets in bonds that are rated in the lower rating categories by at least one of the recognized rating agencies including Baa or lower by Moody's Investors Service, Inc. ("Moody's") or BBB or lower by Standard &amp; Poor's ("S&amp;P") or Fitch Ratings ("Fitch"), or in unrated securities that Fund management believes are of comparable quality. Securities rated below Baa by Moody's or below BBB by S&amp;P or Fitch are commonly known as "junk bonds." Junk bonds are high-risk investments that may cause income and principal losses for the High Income Fund. The High Income Fund may invest in fixed-income securities of any duration or maturity. The High Income Fund may also invest up to 15% of its net assets in secondary market purchases of corporate loans.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The High Income Fund will invest most of its assets in securities issued by U.S. issuers, but may also invest a portion of its assets in securities issued by foreign issuers. The Fund may also invest in derivative securities for hedging purposes or to increase the return on its investments.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by i dentifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse406false0rr_StrategyPortfolioConcentrationrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font style="font-size: 10pt;" class="_mt">The High Income Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse407false0rr_RiskHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Risks of Investing in the Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNarrative Risk Disclosure.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subsection b falsefalse408false0rr_RiskNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time.&nbsp;<font class="_mt">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.</font> The following is a summary description of certain risks of investing in the Fund.</font></p> <ul> <li><font style="font-size: 10pt;" class="_mt"><b><i>Corporate Loans Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Commercial banks and other financial institutions or institutional investors make corporate loans to companies that need capital to grow or restructure. Borrowers generally pay interest on corporate loans at rates that change in response to changes in market interest rates such as the London Interbank Offered Rate ("LIBOR") or the prime rates of U.S. banks. As a result, the value of corporate loan investments is generally less exposed to the adverse effects of shifts in market interest rates than investments that pay a fixed rate of interest.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Credit Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Credit risk refers to the possibility that the issuer of a security will not be able to make payments of interest and principal when due. Changes in an issuer's credit rating or the market's perception of an issuer's creditworthiness may also affect the value of the Fund's investment in that issuer.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Derivatives Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund's use of derivatives may reduce the Fund's returns and/or increase volatility. Volatility is defined as the characteristic of a security, an index or a market to fluctuate significantly in price within a short time period. Derivatives are also subject to counterparty risk, which is the risk that the other party in the transaction will not fulfill its contractual obligation. A risk of the Fund's use of derivatives is that the fluctuations in their values may not correlate perfectly with the overall securities markets. The possible lack of a liquid secondary market for derivatives and the resulting inability of the Fund to sell or otherwise close a derivatives position could expose the Fund to losses and could make derivatives more difficult for the Fund to value accurately. Derivatives may give rise to a form of lev erage and may expose the Fund to greater risk and increase its costs.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Extension Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates rise, certain obligations will be paid off by the obligor more slowly than anticipated, causing the value of these securities to fall.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Foreign Securities Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include:<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Changes in foreign currency exchange rates can affect the value of the Fund's portfolio.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position. <br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Settlement and clearance procedures in certain foreign markets may result in delays in payment for or delivery of securities not typically associated with settlement and clearance of U.S. investments.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Interest Rate Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Interest rate risk is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall, and decrease as interest rates rise.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Junk Bonds Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Although junk bonds generally pay higher rates of interest than investment grade bonds, junk bonds are high risk investments that may cause income and principal losses for the Fund.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Market Risk and Selection Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Prepayment Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates fall, certain obligations will be paid off by the obligor more quickly than originally anticipated, and the Fund may have to invest the proceeds in securities with lower yields.<br /><br /></font></li></ul></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringNarrative Risk Disclosure. A Fund may, in responding to thi s Item, describe the types of investors for whom the Fund is intended or the types of investment goals that may be consistent with an investment in the Fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph i -Clause instruction -Subsection b falsefalse409false0rr_RiskLoseMoneyrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringSummarize the principal risks of investing in the Fund, including the risks to which the Fund's portfolio as a whole is subject and the circumstances reasonably likely to affect adversely the Fund's net asset value, yield, and total return. Unless the Fund is a Money Market Fund, disclose that loss of money is a r isk of investing in the Fund. A Fund may, in responding to this Item, describe the types of investors for whom the Fund is intended or the types of investment goals that may be consistent with an investment in the Fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph i -Subsection b falsefalse410false0rr_BarChartAndPerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><i><strong>Performance Information</strong></i></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse411false0rr_PerformanceNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalse false00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font></font>The table compares the Fund's performance to that of the Barclays Capital U.S. Corporate High Yield 2% Issuer Capped Index.&nbsp;<font class="_mt">As with all such investments, past performance (before and after taxes) is not an indication of future results.</font>&nbsp;<font class="_mt">Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.</font>&nbsp;<font class="_mt">However, the table includes all applicable fees and sales charges.</font> If the Fund's investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund's returns would have been low er. Updated information on the Fund's performance can be obtained by visiting&nbsp;<font class="_mt">http://www.blackrock.com/funds</font> or can be obtained by phone at <font class="_mt">800-882-0052</font>.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse412false0rr_PerformanceInformationIllustratesVariabilityOfReturnsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInclude the bar chart and table required by paragraphs (b)(2)(ii) and (iii) of this section. Provide a brief explanation of how the information illustrates the variability of the Fund's ret urns (e.g., by stating that the information provides some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for 1, 5, and 10 years compare with those of a broad measure of market performance). Provide a statement to the effect that the Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse413false0rr_PerformanceAvailabilityPhonerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00800-882-0052falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf applicable, include a statement explaining that updated performance information is available and providing a Web site address and/or toll-free (or collect) telephone number where the updated information may be obtained.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse414false0rr_PerformanceAvailabilityWebSiteAddressrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00http://www.blackrock.com/fundsfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf applicable, include a statement explaining that updated performance information is available and providing a Website address and/or toll-free (or collect) telephone number where the updated information may be obtained.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse415false0rr_PerformancePastDoesNotIndicateFuturerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00As with all such investments, past performance (before and after taxes) is not an indication of future results.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInclude the bar chart and table required by paragraphs (b)(2)(ii) and (iii) of this section. Provide a brief explanation of how the information illustrates the variability of the Fund's returns (e.g., by stating that the information provides some indication of the risks of investing in th e Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for 1, 5, and 10 years compare with those of a broad measure of market performance). Provide a statement to the effect that the Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse416false0rr_BarChartHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="center"><font style="font-size: 11pt;" class="_mt"><b>Investor C1 Shares<br />ANNUAL TOTAL RETURNS<br />BlackRock High Income Fund<br />As of 12/31</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse417false0rr_BarChartDoesNotReflectSalesLoadsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInclude the bar chart and table required by Item 4 (b)(2)(ii) and (iii) of this section. Provide a brief explanation of how the information illustrates the variability of the Fund's returns (e.g., by stating that the information provides some indication of the risks of investing in the Fund by showing changes in the Fund's perf ormance from year to year and by showing how the Fund's average annual returns for 1, 5, and 10 years compare with those of a broad measure of market performance). Provide a statement to the effect that the Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Provide annual total returns beginning with the earliest calendar year. Calculate annual returns using the Instructions to Item 8(a), except that the calculations should be based on calendar years. If a Fund's shares are sold subject to a sales load or account fees, state that sales loads or account fees are not reflected in the bar chart and that, if these amounts were reflected, returns would be less than those shown.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse418false0rr_BarChartClosingTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsef alse00<div> <div class="MetaData"> <p><font style="font-size: 10pt;" class="_mt">During the ten-year period shown in the bar chart, the&nbsp;<font class="_mt">highest return</font> for a quarter was&nbsp;<font class="_mt">20.19%</font> (quarter ended June 30, 2009) and the&nbsp;<font class="_mt">lowest return</font> for a quarter was&nbsp;<font class="_mt">-23.67%</font> (quarter ended December 31, 2008).</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse419false0rr_PerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="text-indent: 0in; margin: 0in 0in 0pt;" class="MsoNormal"><b><font style="font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">As of 12/31/10<br />Average Annual Total Returns</font></b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringThis item represents Average Anuual Total Returns. If a Multiple Class Fund offers a Class in the prospectus that converts into another Class after a stated period, compute average annual total returns in the table by using the returns of the other Class for the perio d after conversion.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit c -Subsection b falsefalse420false0rr_PerformanceTableDoesReflectSalesLoadsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00However, the table includes all applicable fees and sales charges.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf the Fund has annual returns for at least one calendar year, provide a table showing the Fund's (A) average annual total return; (B) average annual total return (after taxes on distributions); and (C) average annual total return (after taxes on distributions and redemption). A Money Market Fund should show only the returns described in clause (A) of t he preceding sentence. All returns should be shown for 1-, 5-, and 10- calendar year periods ending on the date of the most recently completed calendar year (or for the life of the Fund, if shorter), but only for periods subsequent to the effective date of the Fund's registration statement. The table also shouldshow the returns of an appropriate broadbased securities market index as defined in Instruction 5 to Item 22(b)(7) for the same periods. A Fund that has been in existence for more than 10 years also may include returns for the life of the Fund. A Money Market Fund may provide the Fund's 7-day yield ending on the date of the most recent calendar year or disclose a toll-free (or collect) telephone number that investors can use to obtain the Fund's current 7-day yield. For a Fund (other than a Money Market Fund or a Fund described in General Instruction C.3.(d)(iii)), provide the information in the following table with the specified captions AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31 , _____)Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Subsection b falsefalse421false0rr_PerformanceTableUsesHighestFederalRaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font style="font-size: 10pt;" class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. </font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringProvide a brief explanation that after-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Subsection b falsefalse422false0rr_PerformanceTableNotRelevantToTaxDeferredrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringProvide a brief explanation that the actual after-tax returns depend on an investor's tax situation and may differ from those show n, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iv -Clause B -Subsection b falsefalse423false0rr_PerformanceTableNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. </font></font><font class="_mt">Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.</font></font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIf the Fund has annual returns for at least one calendar year, provide a table showing the Fund's (A) average annual total return; (B) average annual total return (after taxes on distributions); and (C) average annual total return (after taxes on distributions and redemption). A Money Market Fund should show only the returns described in clause (A) of the preceding sentence. All returns should be shown for 1-, 5-, and 10- calendar year periods ending on the date of the most recently completed calendar year (or for the life of the Fund, if shorter), but only for periods subsequent to the effective date of the Fund's registration statement. The table also shouldshow the returns of an appropriate broadbased securities market index as defined in Instruction 5 to Item 22(b)(7) for the same periods. A Fund that has been in existence for more than 10 years also may include returns for the life of the Fund. A Money Market Fund may provide the Fund's 7-day yield ending on the date of the most recent calendar year or disclose a toll-free (or collect) telephone number that investors can use to obtain the Fund's current 7-day yield. For a Fund (other than a Money Market Fund or a Fund described in General Instruction C.3.(d)(iii)), provide the information in the following table with the specified captions AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, _____). For a Fund that provides annual total returns for only one calendar year or for a Fund that does not include the bar chart because it does not have annual returns for a full calendar year, modify, as appropriate, the narrative explanation required by paragraph (c)(2)(i) (e.g., by stating that the information gives some indication of the risks of an investment in the Fund by comparing the Fund's performance with a broad measure of market performance).Refe rence 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iv -Subsection b falsefalse424false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse23falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : Service Member {dei_LegalEntityAxis} : S000004072 Member {rr_PerformanceMeasureAxis} : Barclays Capital U S Corporate High Yield2 Issuer Capped Index Member 1/28/2011 - 1/28/2011 Duration_1_28_2011_To_1_28_201130http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseServicedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_ServiceMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberfalsefalseBarclays Capital U.S. Corporate High Yield 2% Issuer Capped Index (Reflects no deduction for fees, expenses or taxes)rr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_BarclaysCapitalUSCorporateHighYield2IssuerCappedIndexMemberrr_PerformanceMeasureAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalse425true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse426false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.14940.1494falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1 : 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse427false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 0890.089falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse428false0rr_AverageAnnualReturnYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0 .09010.0901falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse429false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse24falsefalseUSDtruefalse{dei_DocumentInformationDocumentAxis} : Service Member {dei_LegalEntityAxis} : S000004071 Member {rr_ProspectusShareClassAxis} : C000052630 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_201113http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseServicedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_ServiceMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityA xisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseServicerr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000052630Memberrr_ProspectusShareClassAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse430true0rr_RiskRe turnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00false< ShowCurrencySymbol>falsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse431false0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.in structions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the per centage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalse432false0rr_MaximumDeferredSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1true< /IsNumeric>truetrue00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset v alue at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalse433false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00440.0044[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse434false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00250.0025[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalse435false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00710.0071[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions falsefalse436false0rr_Component1OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue< NumericAmount>0.00460.0046[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse437false0rr_Component2OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00250.0025[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 10 -Subsection table falsefalse438false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.0140.014[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions falsefalse439false0rr_FeeWaiverOrReimbursementOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetr ue-0.0009-0.0009[10],[11]falsefalsefalsefalsefalseOtherrr:NonPositivePure4TypepureTotal Annual Fund Operating Expenses. If there were expense reimbursement or fee waiver arrangements that reduced any Fund operating expenses and will continue to reduce them for no less than one year from the effective date of the Fund's registration statement, a Fund may add two captions to the table one caption showing the amount of the expense reimbursement or fee waiver, and a second ca ption showing the Fund's net expenses after subtracting the fee reimbursement or expense waiver from the total fund operating expenses. The Fund should place these additional captions directly below the "Total Annual Fund Operating Expenses" caption of the table and should use appropriate descriptive captions, such as "Fee Waiver [and/or Expense Reimbursement]" and "Total Annual Fund Operating Expenses After Fee Waiver [and/or Expense Reimbursement]," respectively. If the Fund provides this disclosure, also disclose the period for which the expense reimbursement or fee waiver arrangement is expected to continue, and briefly describe who can terminate the arrangement and under what circumstances.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse440false0rr_NetExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.01310.0131[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse441false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue133133falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse442false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue419419falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse443false0rr_ExpenseExampleYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue727727falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse444false0rr_ExpenseExampleYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue16001600falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse445false0rr_AnnualReturn2002rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.08340.0834falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return informatio n as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse446false0rr_AnnualReturn2003rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.04210.0421falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalse447false0rr_AnnualReturn2004rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.03950.0395falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalse448false0rr_AnnualReturn2005rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.02030.0203falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse449false0rr_AnnualReturn2006rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.03680.0368falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse450false0rr_AnnualReturn2007rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.04820.0482falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalse451false0rr_AnnualReturn2008rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.1141-0.1141falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date retur n information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse452false0rr_AnnualReturn2009rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.15950.1595falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalse453false0rr_AnnualReturn2010rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.09750.0975falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse454false0rr_HighestQuarterlyReturnLabelrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 00highest returnfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar y ear, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse455false0rr_BarChartHighestQuarterlyReturnDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 002009-09-30falsefalsetruefalsefalseOtherxbrli:dateItemTypedateIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse456false0rr_BarChartHighestQuarterlyReturnrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.07150.0715falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, includ e the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse457false0rr_LowestQuarterlyReturnLabelrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00lowest returnfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calend ar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse458false0rr_BarChartLowestQuarterlyReturnDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse002008-09-30falsefalsetruefalsefalseOtherxbrli:dateItemTypedateIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a c alendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse459false0rr_BarChartLowestQuarterlyReturnrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.0693-0.0693falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, includ e the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse460false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue 0.09750.0975falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse461false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 04140.0414falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse462false0rr_AverageAnnualReturnSinceInceptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.04430.0443falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse463false0rr_AverageAnnualReturnInceptionDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse002001-12-07falsefalsetruefalsefalseOtherxbrli:dateItemTypedateReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 4 -Subsection b falsefalse464false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse25falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : Service Member {dei_LegalEntityAxis} : S000004071 Member {rr_ProspectusShareClassAxis} : C000052630 Member {rr_PerformanceMeasureAxis} : Return After Taxes on Distributions 1/28/2011 - 1/28/2011 Duration_1_28_2011_To_1_28_201122http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseServicedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_ServiceMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxis< Namespace>xbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseServicerr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000052630Memberrr_ProspectusShareClassAxisexplicitMemberfalsefalseReturn After Taxes on Distributionsrr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldirr_AfterTaxesOnDistributionsMemberrr_PerformanceMeasureAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.false false465true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse466false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.08180.0818falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse467false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 02950.0295falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse468false0rr_AverageAnnualReturnSinceInceptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.03770.0377falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse469false0rr_AverageAnnualReturnInceptionDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse002001-12-07falsefalsetruefalsefalseOtherxbrli:dateItemTypedateReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 4 -Subsection b falsefalse470false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse26falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : Service Member {dei_LegalEntityAxis} : S000004071 Member {rr_ProspectusShareClassAxis} : C000052630 Member {rr_PerformanceMeasureAxis} : Return After Taxes on Distributions and Sale of Shares 1/28/2011 - 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1/28/2011 Duration_1_28_2011_To_1_28_20116http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseServicedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_ServiceMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.fals efalse477true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse478false0rr_RiskReturnHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 30pt;" class="_mt">Fund Overview</font></p> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Key Facts about BlackRock Total Return Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Investment Objectives/Goals Include the following information, in plain English under rule 421(d) under the Securities Act, in the order and subject matter indicatedReference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 falsefalse479false0rr_ObjectiveHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Investment Objective</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse480false0rr_ObjectivePrimaryTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse< NumericAmount>00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The investment objective of the BlackRock Total Return Fund (the "Fund") is to realize a total return that exceeds that of the Barclays Capital U.S. Aggregate Bond Index.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse481false0rr_ExpenseHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Fees and Expenses of the Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Fee Table Includes the following information, in plain English under rule 421(d) under the Securities Act, after Item 2 Fees and expenses of the Fund This table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to inve st in the future, at least $[_____] in [name of fund family] funds. Shareholder Fees (fees paid directly from your investment) 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 you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be You would pay the following expenses if you did not redeem your shares The Example does not reflect sales charges (loads) on reinvested dividends [and other distributions]. If these sales charges (loads) were included, your costs would be higher. Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its po rtfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was __% of the average value of its whole portfolio. Instructions. A.3.instructions.6 New Funds. For purposes of this Item, a "New Fund" is a Fund that does not include in Form N-1A financial statements reporting operating results or that includes financial statements for the Fund's initial fiscal year reporting operating results for a period of 6 months or less. The following Instructions apply to New Funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph d -Subsection instructions falsefalse482false0rr_ExpenseNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">This table describes the fees and expenses that you may pay if you buy and hold Service Shares of the Fund.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThis table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $[_____] in [name of fund family] funds. Include the narrative explanations in the order indicated. A Fund may modify the narrative explanations if the explanation contains comparable information to that shown.The narrative explanation regarding sales charge discounts is only required by a Fund that offers such discounts and should specify the minimum level of investment required to qualify for a discount. Modify the narrative explanation to state that Fund shares are sold on a national securities exchange at the end of the time periods indicated, and that brokerage commissions for buying and selling Fund shares through a broker are not reflected.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph b -Subsection instructions falsefalse483false0rr_ShareholderFeesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="line-height: normal; margin: 0in 0in 0pt; font-family: 'Calibri','sans-serif'; font-size: 11pt;" class="MsoNormal"><b><font style="font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">Shareholder Fees <br />(fees paid directly from your investment)</font></b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringShareholder Fees (fees paid directly from your investment).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subsection table falsefalse484false0rr_OperatingExpensesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<strong><font size="2" class="_mt">Annual Fund Operating Expenses<br />(expenses that you pay each year as a percentage of the value of your investment)</font></strong>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringAnnual Fund Operating Expenses (ongoing expenses that you pay each year as a percentage of the value of your investment)Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 7 -Subsection table falsefalse485false0rr_FeeWaiverOrReimbursementOverAssetsDateOfTerminationrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00February 1, 2012falsefalsefalsefalsefalseOtherus-types:dateStringItemTypenormalizedstringThis element represents the date of expected termination of any expense reimbursement or fee waiver arrangements that reduce any Fund operating expenses (SEC Form N-1A 2006-09-14 A.3.table.1.11 Total Annual Fund Operating Expenses A.3.instructions.3.e).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph e -Subsection instructions falsefalse486false0rr_PortfolioTurnoverHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 11pt;" class="_mt"><b>Portfolio Turnover</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 5 -Subsection instructions falsefalse487false0rr_PortfolioTurnoverTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was&nbsp;<font class="_mt">1,754%</font> of the average value of its portfolio.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subsection example falsefalse488false0rr_PortfolioTurnoverRaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse17.5417.54falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureThis element represents the rate of portfolio turnover presented as a percentage (SEC Form N-1A 2006-09-14 A.3.example.3 Portfolio Turnover A.3.instructions.5 Portfolio Turnover).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subsection example falsefalse489false0rr_ExpenseExampleHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 00<div class="MetaData"> <p align="left"><font style="font-size: 11pt;" class="_mt"><strong>Example:</strong></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringHeading for Expense Example.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse490false0rr_ExpenseExampleNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">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:</font></p></div> </div>falsefalsefalsefalsefalseOtherus-t ypes:textBlockItemTypestringThe Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection example falsefalse491false0rr_StrategyHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Investment Strategies of the Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industr y or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse492false0rr_StrategyNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse< NumericAmount>00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font></font></font></font></font></font>Both U.S. and foreign companies and governments may issue these securities.&nbsp;<font class="_mt">Under normal circumstances, the Fund invests at least 80% of its assets in bonds and invests primarily in investment grade fixed-income securities.</font> The Fund may invest in fixed-income securities of any duration or maturity.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund will invest most of its assets in securities issued by U.S. issuers, but may also invest a portion of its assets in securities issued by foreign issuers. The Fund may also invest in derivative securities for hedging purposes or to increase the return on its investments. The Total Return Fund may also enter into dollar rolls.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Total Return Fund may invest up to 20% of its net assets in fixed-income securities that are rated below investment grade by at least one of the recognized rating agencies or in unrated securities of equivalent credit quality.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund is a "feeder" fund that invests all of its assets in a corresponding "master" portfolio, the Master Total Return Portfolio (the "Master Portfolio"), a series of the Master Bond LLC (the "Master LLC"), a mutual fund that has the same investment objectives and strategies as the Fund. All investments will be made at the level of the Master Portfolio. This structure is sometimes called a "master/feeder" structure. The Fund's investment results will correspond directly to the investment results of the underlying Master Portfolio in which it invests. For simplicity, this Prospectus uses the term "Fund" to include the Master Portfolio.</font></p></div> </div>falsefalsefalsef alsefalseOtherus-types:textBlockItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse493false0rr_StrategyPortfolioConcentrationrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font></font></font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse494false0rr_RiskHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Risks of Investing in the Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNarrative Risk Disclosure.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subsection b falsefalse495false0rr_RiskNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time.&nbsp;<font class="_mt">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.</font> The following is a summary description of certain risks of investing in the Fund.</font></p> <ul> <li><font style="font-size: 10pt;" class="_mt"><b><i>Credit Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Credit risk refers to the possibility that the issuer of a security will not be able to make payments of interest and principal when due. Changes in an issuer's credit rating or the market's perception of an issuer's creditworthiness may also affect the value of the Fund's investment in that issuer.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Derivatives Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund's use of derivatives may reduce the Fund's returns and/or increase volatility. Volatility is defined as the characteristic of a security, an index or a market to fluctuate significantly in price within a short time period. Derivatives are also subject to counterparty risk, which is the risk that the other party in the transaction will not fulfill its contractual obligation. A risk of the Fund's use of derivatives is that the fluctuations in their values may not correlate perfectly with the overall securities markets. The possible lack of a liquid secondary market for derivatives and the resulting inability of the Fund to sell or otherwise close a derivatives position could expose the Fund to losses and could make derivatives more difficult for the Fund to value accurately. Derivatives may give rise to a form of lev erage and may expose the Fund to greater risk and increase its costs.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Dollar Rolls Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Dollar rolls involve the risk that the market value of the securities that the Fund is committed to buy may decline below the price of the securities the Fund has sold. These transactions may involve leverage.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Extension Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates rise, certain obligations will be paid off by the obligor more slowly than anticipated, causing the value of these securities to fall.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Foreign Securities Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include:<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Changes in foreign currency exchange rates can affect the value of the Fund's portfolio.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Settlement and clearance procedures in certain foreign markets may result in delays in payment for or delivery of securities not typically associated with settlement and clearance of U.S. investments.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>High Portfolio Turnover Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund may engage in active and frequent trading of its portfolio securities. High portfolio turnover (more than 100%) may result in increased transaction costs to the Fund, including brokerage commissions, dealer mark-ups and other transaction costs on the sale of the securities and on reinvestment in other securities. The sale of Fund portfolio securities may result in the realization and/or distribution to shareholders of higher capital gains or losses as compared to a fund with less active trading policies. Given the frequency of sales, such gain or loss will likely be short-term capital gain or loss and, in the event of a gain, would increase an investor's tax liability unless shares are held through a tax-deferred or exempt vehicle. These effects of higher than normal portfolio turnover may adversely aff ect Fund performance. In addition, investment in mortgage dollar rolls and participation in TBA transactions may significantly increase the Fund's portfolio turnover rate. A TBA transaction is a method of trading mortgage-backed securities where the buyer and seller agree upon general trade parameters such as agency, settlement date, par amount, and price.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Interest Rate Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Interest rate risk is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall, and decrease as interest rates rise.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Junk Bonds Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Although junk bonds generally pay higher rates of interest than investment grade bonds, junk bonds are high risk investments that may cause income and principal losses for the Fund.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Market Risk and Selection Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Mortgage- and Asset-Backed Securities Risks</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Mortgage- and asset-backed securities represent interests in "pools" of mortgages or other assets, including consumer loans or receivables held in trust. Mortgage- and asset-backed securities are subject to credit, interest rate, prepayment and extension risks. These securities also are subject to risk of default on the underlying mortgage or asset, particularly during periods of economic downturn. Small movements in interest rates (both increases and decreases) may quickly and significantly reduce the value of certain mortgage-backed securities.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Prepayment Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates fall, certain obligations will be paid off by the obligor more quickly than originally anticipated, and the Fund may have to invest the proceeds in securities with lower yields.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Sovereign Debt Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Sovereign debt instruments are subject to the risk that a governmental entity may delay or refuse to pay interest or repay principal on its sovereign debt, due, for example, to cash flow problems, insufficient foreign currency reserves, political considerations, the relative size of the governmental entity's debt position in relation to the economy or the failure to put in place economic reforms required by the International Monetary Fund or other multilateral agencies.<br /><br /></font></li></ul></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringNarrative Risk Disclosure. A Fund may, in responding to this Item, describe the types of investors for whom the Fund is intended or the types of investment goals that may be consistent with an investment in the Fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph i -Clause instruction -Subsection b falsefalse496false0rr_RiskLoseMoneyrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringSummarize the principal risks of investing in the Fund, including the risks to which the Fund's portfolio as a whole is subject and the circumstances reasonably likely to affect adversely the Fund's net asset value, yield, and total return. Unless the Fund is a Money Market Fund, disclose that loss of money is a r isk of investing in the Fund. A Fund may, in responding to this Item, describe the types of investors for whom the Fund is intended or the types of investment goals that may be consistent with an investment in the Fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph i -Subsection b falsefalse497false0rr_BarChartAndPerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><i><strong>Performance Information</strong></i></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse498false0rr_PerformanceNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalse false00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font></font>The table compares the Fund's performance to that of the Barclays Capital U.S. Aggregate Bond Index. Effective September 24, 2007, the Fund reorganized with BlackRock Total Return Portfolio (the "Predecessor Fund"), a series of BlackRock Funds II (the "Reorganization"), and the Predecessor Fund's performance and financial history has been adopted by the Fund and will be used going forward from the date of the Reorganization. The information below is based on the performance information of the combined fund resulting from the Reorganization and that of the Predecessor Fund prior to the Reorganization (adjusted as necessary to reflect the fees applicable to Service Shares of the Fund). Prior September 24, 2007, Service Share performance results are those of Investor A Shares of the Predeccessor Fund restated to reflect Service Share fees.&nbsp;<font class="_mt">As with all such investments, past performance (before and after taxes) is not an indication of future results.</font>&nbsp;<font class="_mt">Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.</font>&nbsp;<font class="_mt">However, the table includes all applicable fees and sales charges.</font> If the Fund's investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund's returns would have been lower. Updated information on the Fund's performance can be obtained by visiting&nbsp;<font class="_mt">http://www.blackrock.com/funds</font> or can be obtained by phone at <font class="_mt"><font style="font-size: 10pt;" class="_mt">800-882-0052.</font></font> </font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse499false0rr_PerformanceInformationIllustratesVariabilityOfReturnsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInclude the bar chart and table required by paragraphs (b)(2)(ii) and (iii) of this section. Provide a brief explanation of how the information illustrates the variability of the Fund's ret urns (e.g., by stating that the information provides some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for 1, 5, and 10 years compare with those of a broad measure of market performance). Provide a statement to the effect that the Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse500false0rr_PerformanceAvailabilityPhonerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font style="font-size: 10pt;" class="_mt">800-882-0052.</font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf applicable, include a statement explaining that updated performance information is available and providing a Web site address and/or toll-free (or collect) telephone number where the updated information may be obtained.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse501false0rr_PerformanceAvailabilityWebSiteAddressrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00http://www.blackrock.com/fundsfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf applicable, include a statement explaining that updated performance information is available and providing a Website address and/or toll-free (or collect) telephone number where the updated information may be obtained.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse502false0rr_PerformancePastDoesNotIndicateFuturerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00As with all such investments, past performance (before and after taxes) is not an indication of future results.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInclude the bar chart and table required by paragraphs (b)(2)(ii) and (iii) of this section. Provide a brief explanation of how the information illustrates the variability of the Fund's returns (e.g., by stating that the information provides some indication of the risks of investing in th e Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for 1, 5, and 10 years compare with those of a broad measure of market performance). Provide a statement to the effect that the Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse503false0rr_BarChartHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="center"><font style="font-size: 11pt;" class="_mt"><b>Service Shares<br />ANNUAL TOTAL RETURNS<br />BlackRock Total Return Fund<br />As of 12/31</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse504false0rr_BarChartDoesNotReflectSalesLoadsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInclude the bar chart and table required by Item 4 (b)(2)(ii) and (iii) of this section. Provide a brief explanation of how the information illustrates the variability of the Fund's returns (e.g., by stating that the information provides some indication of the risks of investing in the Fund by showing changes in the Fund's perf ormance from year to year and by showing how the Fund's average annual returns for 1, 5, and 10 years compare with those of a broad measure of market performance). Provide a statement to the effect that the Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Provide annual total returns beginning with the earliest calendar year. Calculate annual returns using the Instructions to Item 8(a), except that the calculations should be based on calendar years. If a Fund's shares are sold subject to a sales load or account fees, state that sales loads or account fees are not reflected in the bar chart and that, if these amounts were reflected, returns would be less than those shown.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse505false0rr_BarChartClosingTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsef alse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">During the period shown in the bar chart, the&nbsp;<font class="_mt">highest return</font> for a quarter was&nbsp;<font class="_mt">7.15%</font> (quarter ended September 30, 2009) and the&nbsp;<font class="_mt">lowest return</font> for a quarter was&nbsp;<font class="_mt">-6.93%</font> (quarter ended September 30, 2008).</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse506false0rr_PerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <div> <p style="font-family: 'Times New Roman','serif'; margin-left: 0in; font-size: 12pt; margin-right: 0in;"><b><font style="font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">As of 12/31/10<br />Average Annual Total Returns</font></b><b><font style="font-family: 'Arial','sans-serif'; font-size: 11pt;" class="_mt"> </font></b></p></div></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringThis item represents Average Anuual Total Returns. If a Multiple Class Fund offers a Class in the pros pectus that converts into another Class after a stated period, compute average annual total returns in the table by using the returns of the other Class for the period after conversion.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit c -Subsection b falsefalse507false0rr_PerformanceTableDoesReflectSalesLoadsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00However, the table includes all applicable fees and sales charges.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf the Fund has annual returns for at least one calendar year, provide a table showing the Fund's (A) average annual total return; (B) average annual total return (after taxes on distributions); and (C) average annual total return (after taxes on distributions and redemption). A Money Market Fund should show only the returns described in clause (A) of t he preceding sentence. All returns should be shown for 1-, 5-, and 10- calendar year periods ending on the date of the most recently completed calendar year (or for the life of the Fund, if shorter), but only for periods subsequent to the effective date of the Fund's registration statement. The table also shouldshow the returns of an appropriate broadbased securities market index as defined in Instruction 5 to Item 22(b)(7) for the same periods. A Fund that has been in existence for more than 10 years also may include returns for the life of the Fund. A Money Market Fund may provide the Fund's 7-day yield ending on the date of the most recent calendar year or disclose a toll-free (or collect) telephone number that investors can use to obtain the Fund's current 7-day yield. For a Fund (other than a Money Market Fund or a Fund described in General Instruction C.3.(d)(iii)), provide the information in the following table with the specified captions AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31 , _____)Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Subsection b falsefalse508false0rr_PerformanceTableUsesHighestFederalRaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font style="font-size: 10pt;" class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. </font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringProvide a brief explanation that after-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Subsection b falsefalse509false0rr_PerformanceTableNotRelevantToTaxDeferredrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringProvide a brief explanation that the actual after-tax returns depend on an investor's tax situation and may differ from those show n, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iv -Clause B -Subsection b falsefalse510false0rr_PerformanceTableNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. </font></font><font class="_mt">Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.</font></font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIf the Fund has annual returns for at least one calendar year, provide a table showing the Fund's (A) average annual total return; (B) average annual total return (after taxes on distributions); and (C) average annual total return (after taxes on distributions and redemption). A Money Market Fund should show only the returns described in clause (A) of the preceding sentence. All returns should be shown for 1-, 5-, and 10- calendar year periods ending on the date of the most recently completed calendar year (or for the life of the Fund, if shorter), but only for periods subsequent to the effective date of the Fund's registration statement. The table also shouldshow the returns of an appropriate broadbased securities market index as defined in Instruction 5 to Item 22(b)(7) for the same periods. A Fund that has been in existence for more than 10 years also may include returns for the life of the Fund. A Money Market Fund may provide the Fund's 7-day yield ending on the date of the most recent calendar year or disclose a toll-free (or collect) telephone number that investors can use to obtain the Fund's current 7-day yield. For a Fund (other than a Money Market Fund or a Fund described in General Instruction C.3.(d)(iii)), provide the information in the following table with the specified captions AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, _____). For a Fund that provides annual total returns for only one calendar year or for a Fund that does not include the bar chart because it does not have annual returns for a full calendar year, modify, as appropriate, the narrative explanation required by paragraph (c)(2)(i) (e.g., by stating that the information gives some indication of the risks of an investment in the Fund by comparing the Fund's performance with a broad measure of market performance).Refe rence 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iv -Subsection b falsefalse511false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse28falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : Service Member {dei_LegalEntityAxis} : S000004071 Member {rr_PerformanceMeasureAxis} : Barclays Capital U S Aggregate Bond Index Reflects No Deduction For Fees Expenses Or Taxes Member 1/28/2011 - 1/28/2011 Duration_1_28_2011_To_1_28_201194http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseServicedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_ServiceMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxis< Namespace>xbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseBarclays Capital U.S. Aggregate Bond Index (Reflects no deduction for fees, expenses or taxes)rr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_BarclaysCapitalUSAggregateBondIndexReflectsNoDeductionForFeesExpensesOrTaxesMemberrr_PerformanceMeasureAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalse512true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsef alsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse513false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.06540.0654falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse514false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 0580.058falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse515false0rr_AverageAnnualReturnSinceInceptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.05610.0561falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse516false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse29falsefalseUSDtruefalse{dei_DocumentInformationDocumentAxis} : Blackrock Member {dei_LegalEntityAxis} : S000004071 Member {rr_ProspectusShareClassAxis} : C000052631 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_201110http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseBlackRockdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_BlackrockMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEnt ityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseBlackRockrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000052631Memberrr_ProspectusShareClassAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit 12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse517true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse518false0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage . Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalse519false0rr_MaximumDeferredSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1true< /IsNumeric>truetrue00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset v alue at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalse520false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00440.0044[10],[12]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse521false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalse522false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00550.0055[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions falsefalse523false0rr_Component1OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue< NumericAmount>0.00460.0046[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse524false0rr_Component3OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00090.0009[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse525false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00990.0099[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions falsefalse526false0rr_FeeWaiverOrReimbursementOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetr ue-0.0013-0.0013[10],[12]falsefalsefalsefalsefalseOtherrr:NonPositivePure4TypepureTotal Annual Fund Operating Expenses. If there were expense reimbursement or fee waiver arrangements that reduced any Fund operating expenses and will continue to reduce them for no less than one year from the effective date of the Fund's registration statement, a Fund may add two captions to the table one caption showing the amount of the expense reimbursement or fee waiver, and a second ca ption showing the Fund's net expenses after subtracting the fee reimbursement or expense waiver from the total fund operating expenses. The Fund should place these additional captions directly below the "Total Annual Fund Operating Expenses" caption of the table and should use appropriate descriptive captions, such as "Fee Waiver [and/or Expense Reimbursement]" and "Total Annual Fund Operating Expenses After Fee Waiver [and/or Expense Reimbursement]," respectively. If the Fund provides this disclosure, also disclose the period for which the expense reimbursement or fee waiver arrangement is expected to continue, and briefly describe who can terminate the arrangement and under what circumstances.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse527false0rr_NetExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00860.0086[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse528false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue8888falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.< ElementReferences>Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse529false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue287287falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse530false0rr_ExpenseExampleYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue503503falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse531false0rr_ExpenseExampleYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue11261126falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse532false0rr_AnnualReturn2002rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.09040.0904falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return informatio n as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse533false0rr_AnnualReturn2003rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.0470.047falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return in formation as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalse534false0rr_AnnualReturn2004rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.04520.0452falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalse535false0rr_AnnualReturn2005rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.02520.0252falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse536false0rr_AnnualReturn2006rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.04250.0425falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse537false0rr_AnnualReturn2007rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.05260.0526falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalse538false0rr_AnnualReturn2008rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.111-0.111falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse539false0rr_AnnualReturn2009rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.16360.1636falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalse540false0rr_AnnualReturn2010rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.10140.1014falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse541false0rr_HighestQuarterlyReturnLabelrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 00highest returnfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar y ear, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse542false0rr_BarChartHighestQuarterlyReturnDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 002009-09-30falsefalsetruefalsefalseOtherxbrli:dateItemTypedateIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse543false0rr_BarChartHighestQuarterlyReturnrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.07130.0713falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, includ e the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse544false0rr_LowestQuarterlyReturnLabelrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00lowest returnfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calend ar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse545false0rr_BarChartLowestQuarterlyReturnDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse002008-09-30falsefalsetruefalsefalseOtherxbrli:dateItemTypedateIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a c alendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse546false0rr_BarChartLowestQuarterlyReturnrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.0685-0.0685falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, includ e the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse547false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue 0.10140.1014falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse548false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 04570.0457falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse549false0rr_AverageAnnualReturnSinceInceptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.04910.0491falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse550false0rr_AverageAnnualReturnInceptionDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse002001-12-07falsefalsetruefalsefalseOtherxbrli:dateItemTypedateReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 4 -Subsection b falsefalse551false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse30falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : Blackrock Member {dei_LegalEntityAxis} : S000004071 Member {rr_ProspectusShareClassAxis} : C000052631 Member {rr_PerformanceMeasureAxis} : Return After Taxes on Distributions 1/28/2011 - 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1/28/2011 Duration_1_28_2011_To_1_28_20112http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseBlackRockdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_BlackrockMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalse564true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse565false0rr_RiskReturnHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 30pt;" class="_mt">Fund Overview</font></p> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Key Facts about BlackRock Total Return Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Investment Objectives/Goals Include the following information, in plain English under rule 421(d) under the Securities Act, in the order and subject matter indicatedReference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 falsefalse566false0rr_ObjectiveHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b>Investment Objective</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse567false0rr_ObjectivePrimaryTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse< NumericAmount>00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The investment objective of the BlackRock Total Return Fund (the "Fund") is to realize a total return that exceeds that of the Barclays Capital U.S. Aggregate Bond Index.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse568false0rr_ExpenseHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><i><strong>Fees and Expenses of the Fund</strong></i></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Fee Table Includes the following information, in plain English under rule 421(d) under the Securities Act, after Item 2 Fees and expenses of the Fund This table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agr ee to invest in the future, at least $[_____] in [name of fund family] funds. Shareholder Fees (fees paid directly from your investment) 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 you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be You would pay the following expenses if you did not redeem your shares The Example does not reflect sales charges (loads) on reinvested dividends [and other distributions]. If these sales charges (loads) were included, your costs would be higher. Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns ov er" its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was __% of the average value of its whole portfolio. Instructions. A.3.instructions.6 New Funds. For purposes of this Item, a "New Fund" is a Fund that does not include in Form N-1A financial statements reporting operating results or that includes financial statements for the Fund's initial fiscal year reporting operating results for a period of 6 months or less. The following Instructions apply to New Funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph d -Subsection instructions falsefalse569false0rr_ExpenseNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">This table describes the fees and expenses that you may pay if you buy and hold BlackRock Shares of the Fund.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThis table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $[_____] in [name of fund family] funds. Include the narrative explanations in th e order indicated. A Fund may modify the narrative explanations if the explanation contains comparable information to that shown.The narrative explanation regarding sales charge discounts is only required by a Fund that offers such discounts and should specify the minimum level of investment required to qualify for a discount. Modify the narrative explanation to state that Fund shares are sold on a national securities exchange at the end of the time periods indicated, and that brokerage commissions for buying and selling Fund shares through a broker are not reflected.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph b -Subsection instructions falsefalse570false0rr_ShareholderFeesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="line-height: normal; margin: 0in 0in 0pt; font-family: 'Calibri','sans-serif'; font-size: 11pt;" class="MsoNormal"><b><font style="font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">Shareholder Fees <br />(fees paid directly from your investment)</font></b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringShareholder Fees (fees paid directly from your investment).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subsection table falsefalse571false0rr_OperatingExpensesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"><strong><font size="2" class="_mt">Annual Fund Operating Expenses<br />(expenses that you pay each year as a percentage of the value of your investment)</font></strong></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringAnnual Fund Operating Expenses (ongoing expenses that you pay each year as a percentage of the value of your investment)Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 7 -Subsection table falsefalse572false0rr_FeeWaiverOrReimbursementOverAssetsDateOfTerminationrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00February 1, 2012falsefalsefalsefalsefalseOtherus-types:dateStringItemTypenormalizedstringThis element represents the date of expected termination of any expense reimbursement or fee waiver arrangements that reduce any Fund operating expenses (SEC Form N-1A 2006-09-14 A.3.table.1.11 Total Annual Fund Operating Expenses A.3.instructions.3.e).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph e -Subsection instructions falsefalse573false0rr_PortfolioTurnoverHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 11pt;" class="_mt"><b>Portfolio Turnover</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 5 -Subsection instructions falsefalse574false0rr_PortfolioTurnoverTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was&nbsp;<font class="_mt">1,754%</font> of the average value of its portfolio.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subsection example falsefalse575false0rr_PortfolioTurnoverRaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse17.5417.54falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureThis element represents the rate of portfolio turnover presented as a percentage (SEC Form N-1A 2006-09-14 A.3.example.3 Portfolio Turnover A.3.instructions.5 Portfolio Turnover).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subsection example falsefalse576false0rr_ExpenseExampleHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 00<div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font style="font-size: 11pt;" class="_mt"><b>Example:</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringHeading for Expense Example.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse577false0rr_ExpenseExampleNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;" align="left"><font style="font-size: 10pt;" class="_mt">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:</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThe Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection example falsefalse578false0rr_StrategyHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Investment Strategies of the Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industr y or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse579false0rr_StrategyNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse< NumericAmount>00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font></font>Both U.S. and foreign companies and governments may issue these securities.&nbsp;<font class="_mt">Under normal circumstances, the Fund invests at least 80% of its assets in bonds and invests primarily in investment grade fixed-income securities.</font> The Fund may invest in fixed-income securities of any duration or maturity.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund will invest most of its assets in securities issued by U.S. issuers, but may also invest a portion of its assets in securities issued by foreign issuers. The Fund may also invest in derivative securities for hedging purposes or to increase the return on its investments. The Fund may also enter into dollar rolls.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Total Return Fund may invest up to 20% of its net assets in fixed-income securities that are rated below investment grade by at least one of the recognized rating agencies or in unrated securities of equivalent credit quality.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund is a "feeder" fund that invests all of its assets in a corresponding "master" portfolio, the Master Total Return Portfolio (the "Master Portfolio"), a series of the Master Bond LLC (the "Master LLC"), a mutual fund that has the same investment objectives and strategies as the Fund. All investments will be made at the level of the Master Portfolio. This structure is sometimes called a "master/feeder" structure. The Fund's investment results will correspond directly to the investment results of the underlying Master Portfolio in which it invests. For simplicity, this Prospectus uses the term "Fund" to include the Master Portfolio.</font></p></div> </div>falsefalsefalsef alsefalseOtherus-types:textBlockItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse580false0rr_StrategyPortfolioConcentrationrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font style="font-size: 10pt;" class="_mt">The Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse581false0rr_RiskHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Risks of Investing in the Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNarrative Risk Disclosure.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subsection b falsefalse582false0rr_RiskNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time.&nbsp;<font class="_mt">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.</font> The following is a summary description of certain risks of investing in the Fund.</font></p> <ul> <li><font style="font-size: 10pt;" class="_mt"><b><i>Credit Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Credit risk refers to the possibility that the issuer of a security will not be able to make payments of interest and principal when due. Changes in an issuer's credit rating or the market's perception of an issuer's creditworthiness may also affect the value of the Fund's investment in that issuer.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Derivatives Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund's use of derivatives may reduce the Fund's returns and/or increase volatility. Volatility is defined as the characteristic of a security, an index or a market to fluctuate significantly in price within a short time period. Derivatives are also subject to counterparty risk, which is the risk that the other party in the transaction will not fulfill its contractual obligation. A risk of the Fund's use of derivatives is that the fluctuations in their values may not correlate perfectly with the overall securities markets. The possible lack of a liquid secondary market for derivatives and the resulting inability of the Fund to sell or otherwise close a derivatives position could expose the Fund to losses and could make derivatives more difficult for the Fund to value accurately. Derivatives may give rise to a form of lev erage and may expose the Fund to greater risk and increase its costs.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Dollar Rolls Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Dollar rolls involve the risk that the market value of the securities that the Fund is committed to buy may decline below the price of the securities the Fund has sold. These transactions may involve leverage.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Extension Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates rise, certain obligations will be paid off by the obligor more slowly than anticipated, causing the value of these securities to fall.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>High Portfolio Turnover Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund may engage in active and frequent trading of its portfolio securities. High portfolio turnover (more than 100%) may result in increased transaction costs to the Fund, including brokerage commissions, dealer mark-ups and other transaction costs on the sale of the securities and on reinvestment in other securities. The sale of Fund portfolio securities may result in the realization and/or distribution to shareholders of higher capital gains or losses as compared to a fund with less active trading policies. Given the frequency of sales, such gain or loss will likely be short-term capital gain or loss and, in the event of a gain, would increase an investor's tax liability unless shares are held through a tax-deferred or exempt vehicle. These effects of higher than normal portfolio turnover may adversely aff ect Fund performance. In addition, investment in mortgage dollar rolls and participation in TBA transactions may significantly increase the Fund's portfolio turnover rate. A TBA transaction is a method of trading mortgage-backed securities where the buyer and seller agree upon general trade parameters such as agency, settlement date, par amount, and price.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Interest Rate Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Interest rate risk is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall, and decrease as interest rates rise.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Foreign Securities Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212;Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include:<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Changes in foreign currency exchange rates can affect the value of the Fund's portfolio.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Settlement and clearance procedures in certain foreign markets may result in delays in payment for or delivery of securities not typically associated with settlement and clearance of U.S. investments.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Junk Bonds Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Although junk bonds generally pay higher rates of interest than investment grade bonds, junk bonds are high risk investments that may cause income and principal losses for the Fund.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Market Risk and Selection Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Mortgage- and Asset-Backed Securities Risks</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Mortgage- and asset-backed securities represent interests in "pools" of mortgages or other assets, including consumer loans or receivables held in trust. Mortgage- and asset-backed securities are subject to credit, interest rate, prepayment and extension risks. These securities also are subject to risk of default on the underlying mortgage or asset, particularly during periods of economic downturn. Small movements in interest rates (both increases and decreases) may quickly and significantly reduce the value of certain mortgage-backed securities.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Prepayment Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates fall, certain obligations will be paid off by the obligor more quickly than originally anticipated, and the Fund may have to invest the proceeds in securities with lower yields.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Sovereign Debt Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Sovereign debt instruments are subject to the risk that a governmental entity may delay or refuse to pay interest or repay principal on its sovereign debt, due, for example, to cash flow problems, insufficient foreign currency reserves, political considerations, the relative size of the governmental entity's debt position in relation to the economy or the failure to put in place economic reforms required by the International Monetary Fund or other multilateral agencies.<br /><br /></font></li></ul></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringNarrative Risk Disclosure. A Fund may, in responding to this Item, describe the types of investors for whom the Fund is intended or the types of investment goals that may be consistent with an investment in the Fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph i -Clause instruction -Subsection b falsefalse583false0rr_RiskLoseMoneyrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringSummarize the principal risks of investing in the Fund, including the risks to which the Fund's portfolio as a whole is subject and the circumstances reasonably likely to affect adversely the Fund's net asset value, yield, and total return. Unless the Fund is a Money Market Fund, disclose that loss of money is a r isk of investing in the Fund. A Fund may, in responding to this Item, describe the types of investors for whom the Fund is intended or the types of investment goals that may be consistent with an investment in the Fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph i -Subsection b falsefalse584false0rr_BarChartAndPerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><i><strong>Performance Information</strong></i></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse585false0rr_PerformanceNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalse false00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font></font>The table compares the Fund's performance to that of the Barclays Capital U.S. Aggregate Bond Index. Effective September 24, 2007, the Total Return Fund reorganized with BlackRock Total Return Portfolio (the "Predecessor Fund"), a series of BlackRock Funds II (the "Reorganization"), and the Predecessor Fund's performance and financial history has been adopted by the Total Return Fund and will be used going forward from the date of the Reorganization. The information below is based on the performance information of the combined fund resulting from the Reorganization and that of the Predecessor Fund prior to the Reorganization. Prior the September 24, 2007, BlackRock Share performance results are thos e of BlackRock Shares of the Predecessor Fund with no adjustments.&nbsp;<font class="_mt">As with all such investments, past performance (before and after taxes) is not an indication of future results.</font>&nbsp;<font class="_mt">Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.</font>&nbsp;<font class="_mt">However, the table includes all applicable fees and sales charges.</font> If the Fund's investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund's returns would have been lower. Updated information on the Fund's performance can be obtained by visiting&nbsp;<font class="_mt">http://www.blackrock.com/funds</font> or can be obtained by phone at&nbsp;<font class="_mt">800-882-0052.</font> </font></p></div> </div>< CurrencySymbol />falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse586false0rr_PerformanceInformationIllustratesVariabilityOfReturnsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInclude the bar chart and table required by paragraphs (b)(2)(ii) and (iii) of this section. Provide a brief explanation of how the information illustrates the variability of the Fund's ret urns (e.g., by stating that the information provides some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for 1, 5, and 10 years compare with those of a broad measure of market performance). Provide a statement to the effect that the Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse587false0rr_PerformanceAvailabilityPhonerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00800-882-0052.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf applicable, include a statement explaining that updated performance information is available and providing a Web site address and/or toll-free (or collect) telephone number where the updated information may be obtained.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse588false0rr_PerformanceAvailabilityWebSiteAddressrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00http://www.blackrock.com/fundsfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf applicable, include a statement explaining that updated performance information is available and providing a Website address and/or toll-free (or collect) telephone number where the updated information may be obtained.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse589false0rr_PerformancePastDoesNotIndicateFuturerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00As with all such investments, past performance (before and after taxes) is not an indication of future results.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInclude the bar chart and table required by paragraphs (b)(2)(ii) and (iii) of this section. Provide a brief explanation of how the information illustrates the variability of the Fund's returns (e.g., by stating that the information provides some indication of the risks of investing in th e Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for 1, 5, and 10 years compare with those of a broad measure of market performance). Provide a statement to the effect that the Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse590false0rr_BarChartHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="center"><font style="font-size: 11pt;" class="_mt"><b>BlackRock Shares<br />ANNUAL TOTAL RETURNS<br />BlackRock Total Return Fund<br />As of 12/31</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse591false0rr_BarChartDoesNotReflectSalesLoadsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInclude the bar chart and table required by Item 4 (b)(2)(ii) and (iii) of this section. Provide a brief explanation of how the information illustrates the variability of the Fund's returns (e.g., by stating that the information provides some indication of the risks of investing in the Fund by showing changes in the Fund's perf ormance from year to year and by showing how the Fund's average annual returns for 1, 5, and 10 years compare with those of a broad measure of market performance). Provide a statement to the effect that the Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Provide annual total returns beginning with the earliest calendar year. Calculate annual returns using the Instructions to Item 8(a), except that the calculations should be based on calendar years. If a Fund's shares are sold subject to a sales load or account fees, state that sales loads or account fees are not reflected in the bar chart and that, if these amounts were reflected, returns would be less than those shown.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse592false0rr_BarChartClosingTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsef alse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">During the period shown in the bar chart, the&nbsp;<font class="_mt">highest return</font> for a quarter was&nbsp;<font class="_mt">7.13%</font> (quarter ended September 30, 2009) and the&nbsp;<font class="_mt">lowest return</font> for a quarter was&nbsp;<font class="_mt">-6.85%</font> (quarter ended September 30, 2008).</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse593false0rr_PerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="font-family: 'Times New Roman','serif'; margin-left: 0in; font-size: 12pt; margin-right: 0in;"><b><font style="font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">As of 12/31/10<br />Average Annual Total Returns</font></b><b><font style="font-family: 'Arial','sans-serif'; font-size: 11pt;" class="_mt"> </font></b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringThis item represents Average Anuual Total Returns. If a Multiple Class Fund offers a Class in the prospectus that converts into another Class after a stated period, compute average annual total returns in the table by using the returns of the other Class for the period after conversion.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit c -Subsection b falsefalse594false0rr_PerformanceTableDoesReflectSalesLoadsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00However, the table includes all applicable fees and sales charges.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf the Fund has annual returns for at least one calendar year, provide a table showing the Fund's (A) average annual total return; (B) average annual total return (after taxes on distributions); and (C) average annual total return (after taxes on distributions and redemption). A Money Market Fund should show only the returns described in clause (A) of t he preceding sentence. All returns should be shown for 1-, 5-, and 10- calendar year periods ending on the date of the most recently completed calendar year (or for the life of the Fund, if shorter), but only for periods subsequent to the effective date of the Fund's registration statement. The table also shouldshow the returns of an appropriate broadbased securities market index as defined in Instruction 5 to Item 22(b)(7) for the same periods. A Fund that has been in existence for more than 10 years also may include returns for the life of the Fund. A Money Market Fund may provide the Fund's 7-day yield ending on the date of the most recent calendar year or disclose a toll-free (or collect) telephone number that investors can use to obtain the Fund's current 7-day yield. For a Fund (other than a Money Market Fund or a Fund described in General Instruction C.3.(d)(iii)), provide the information in the following table with the specified captions AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31 , _____)Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Subsection b falsefalse595false0rr_PerformanceTableUsesHighestFederalRaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font style="font-size: 10pt;" class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. </font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringProvide a brief explanation that after-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Subsection b falsefalse596false0rr_PerformanceTableNotRelevantToTaxDeferredrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringProvide a brief explanation that the actual after-tax returns depend on an investor's tax situation and may differ from those show n, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iv -Clause B -Subsection b falsefalse597false0rr_PerformanceTableNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. </font></font><font class="_mt">Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.</font></font></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIf the Fund has annual returns for at least one calendar year, provide a table showing the Fund's (A) average annual total return; (B) average annual total return (after taxes on distributions); and (C) average annual total return (after taxes on distributions and redemption). A Money Market Fund should show only the returns described in clause (A) of the preceding sentence. All returns should be shown for 1-, 5-, and 10- calendar year periods ending on the date of the most recently completed calendar year (or for the life of the Fund, if shorter), but only for periods subsequent to the effective date of the Fund's registration statement. The table also shouldshow the returns of an appropriate broadbased securities market index as defined in Instruction 5 to Item 22(b)(7) for the same periods. A Fund that has been in existence for more than 10 years also may include returns for the life of the Fund. A Money Market Fund may provide the Fund's 7-day yield ending on the date of the most recent calendar year or disclose a toll-free (or collect) telephone number that investors can use to obtain the Fund's current 7-day yield. For a Fund (other than a Money Market Fund or a Fund described in General Instruction C.3.(d)(iii)), provide the information in the following table with the specified captions AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, _____). For a Fund that provides annual total returns for only one calendar year or for a Fund that does not include the bar chart because it does not have annual returns for a full calendar year, modify, as appropriate, the narrative explanation required by paragraph (c)(2)(i) (e.g., by stating that the information gives some indication of the risks of an investme nt in the Fund by comparing the Fund's performance with a broad measure of market performance).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iv -Subsection b falsefalse598false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse33falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : Blackrock Member {dei_LegalEntityAxis} : S000004071 Member {rr_PerformanceMeasureAxis} : Barclays Capital U S Aggregate Bond Index Reflects No Deduction For Fees Expenses Or Taxes Member 1/28/2011 - 1/28/2011 Duration_1_28_2011_To_1_28_201123http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseBlackRockdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_BlackrockMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseBarclays Capital U.S. Aggregate Bond Index (Reflects no deduction for fees, expenses or taxes)rr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_BarclaysCapitalUSAggregateBondIndexReflectsNoDeductionForFeesExpensesOrTaxesMemberrr_PerformanceMeasureAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepure< /MeasureValue>xbrli0OthernaNo definition available.No authoritative reference available.falsefalse599true0rr_RiskReturnAbstract rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse600false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.06540.0654falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse601false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 0580.058falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse602false0rr_AverageAnnualReturnSinceInceptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.05610.0561falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse603false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse34falsefalseUSDtruefalse{dei_DocumentInformationDocumentAxis} : Prime Member {dei_LegalEntityAxis} : S000004071 Member {rr_ProspectusShareClassAxis} : C000037618 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_201162http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalsePrimedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_PrimeMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxis< /ValueType>xbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor A1 Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000037618Memberrr_ProspectusShareClassAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Un it1Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse604true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00false falsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse605false0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.010.01falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (a s a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumu lative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalse606false0rr_MaximumDeferredSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1true< /IsNumeric>truetrue00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset v alue at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalse607false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00440.0044[10],[13]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse608false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.0010.001[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalse609false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00730.0073[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions falsefalse610false0rr_Component1OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue< NumericAmount>0.00460.0046[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse611false0rr_Component2OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00270.0027[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 10 -Subsection table falsefalse612false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.01270.0127[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests i n the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions falsefalse613false0rr_FeeWaiverOrReimbursementOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetr ue-0.0007-0.0007[10],[13]falsefalsefalsefalsefalseOtherrr:NonPositivePure4TypepureTotal Annual Fund Operating Expenses. If there were expense reimbursement or fee waiver arrangements that reduced any Fund operating expenses and will continue to reduce them for no less than one year from the effective date of the Fund's registration statement, a Fund may add two captions to the table one caption showing the amount of the expense reimbursement or fee waiver, and a second ca ption showing the Fund's net expenses after subtracting the fee reimbursement or expense waiver from the total fund operating expenses. The Fund should place these additional captions directly below the "Total Annual Fund Operating Expenses" caption of the table and should use appropriate descriptive captions, such as "Fee Waiver [and/or Expense Reimbursement]" and "Total Annual Fund Operating Expenses After Fee Waiver [and/or Expense Reimbursement]," respectively. If the Fund provides this disclosure, also disclose the period for which the expense reimbursement or fee waiver arrangement is expected to continue, and briefly describe who can terminate the arrangement and under what circumstances.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse614false0rr_NetExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.0120.012[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse615false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue221221falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse616false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue477477falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse617false0rr_ExpenseExampleYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue753753falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse618false0rr_ExpenseExampleYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue15401540falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse619false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue 0.08940.0894falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse620false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 04050.0405falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse621false0rr_AverageAnnualReturnSinceInceptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.04490.0449falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse622false0rr_AverageAnnualReturnInceptionDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse002001-12-07falsefalsetruefalsefalseOtherxbrli:dateItemTypedateReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 4 -Subsection b falsefalse623false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse35falsefalseUSDtruefalse{dei_DocumentInformationDocumentAxis} : Prime Member {dei_LegalEntityAxis} : S000004071 Member {rr_ProspectusShareClassAxis} : C000037619 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_201172http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalsePrimedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_PrimeMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxis< /ValueType>xbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor B1 Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000037619Memberrr_ProspectusShareClassAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Un it1Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse624true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00false falsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse625false0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a pe rcentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalse626false0rr_MaximumDeferredSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1true< /IsNumeric>truetrue0.010.01[14]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge ( load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalse627false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00440.0044[10],[13]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse628false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.0050.005[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalse629false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00840.0084[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions falsefalse630false0rr_Component1OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue< NumericAmount>0.00460.0046[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse631false0rr_Component2OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00380.0038[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 10 -Subsection table falsefalse632false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.01780.0178[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests i n the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions falsefalse633false0rr_FeeWaiverOrReimbursementOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetr ue-0.0007-0.0007[10],[13]falsefalsefalsefalsefalseOtherrr:NonPositivePure4TypepureTotal Annual Fund Operating Expenses. If there were expense reimbursement or fee waiver arrangements that reduced any Fund operating expenses and will continue to reduce them for no less than one year from the effective date of the Fund's registration statement, a Fund may add two captions to the table one caption showing the amount of the expense reimbursement or fee waiver, and a second ca ption showing the Fund's net expenses after subtracting the fee reimbursement or expense waiver from the total fund operating expenses. The Fund should place these additional captions directly below the "Total Annual Fund Operating Expenses" caption of the table and should use appropriate descriptive captions, such as "Fee Waiver [and/or Expense Reimbursement]" and "Total Annual Fund Operating Expenses After Fee Waiver [and/or Expense Reimbursement]," respectively. If the Fund provides this disclosure, also disclose the period for which the expense reimbursement or fee waiver arrangement is expected to continue, and briefly describe who can terminate the arrangement and under what circumstances.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse634false0rr_NetExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.01710.0171[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse635false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue274274falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse636false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue564564falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse637false0rr_ExpenseExampleYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue928928falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse638false0rr_ExpenseExampleYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue20192019falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse639false0rr_ExpenseExampleNoRedemptionYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetr ue174174falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse640false0rr_ExpenseExampleNoRedemptionYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue 539539falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse641false0rr_ExpenseExampleNoRedemptionYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetru e928928falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subparagraph f -Subsection instructions falsefalse642false0rr_ExpenseExampleNoRedemptionYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetru e20192019falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subparagraph f -Subsection instructions falsefalse643false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue 0.08410.0841falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse644false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 03780.0378falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse645false0rr_AverageAnnualReturnSinceInceptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.04160.0416falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse646false0rr_AverageAnnualReturnInceptionDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse002001-12-07falsefalsetruefalsefalseOtherxbrli:dateItemTypedateReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 4 -Subsection b falsefalse647false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse36falsefalseUSDtruefalse{dei_DocumentInformationDocumentAxis} : Prime Member {dei_LegalEntityAxis} : S000004071 Member {rr_ProspectusShareClassAxis} : C000052629 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_201182http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalsePrimedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_PrimeMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxis< /ValueType>xbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor B2 Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000052629Memberrr_ProspectusShareClassAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0Uni t12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse648true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00false falsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse649false0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a pe rcentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalse650false0rr_MaximumDeferredSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1true< /IsNumeric>truetrue0.0450.045[15]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalse651false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00440.0044[10],[13]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse652false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.010.01[10],[16]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalse653false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00890.0089[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions falsefalse654false0rr_Component1OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue< NumericAmount>0.00460.0046[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse655false0rr_Component2OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00430.0043[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 10 -Subsection table falsefalse656false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.02330.0233[10],[16]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that inve sts in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions falsefalse657false0rr_FeeWaiverOrReimbursementOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetr ue-0.0022-0.0022[10],[13]falsefalsefalsefalsefalseOtherrr:NonPositivePure4TypepureTotal Annual Fund Operating Expenses. If there were expense reimbursement or fee waiver arrangements that reduced any Fund operating expenses and will continue to reduce them for no less than one year from the effective date of the Fund's registration statement, a Fund may add two captions to the table one caption showing the amount of the expense reimbursement or fee waiver, and a second ca ption showing the Fund's net expenses after subtracting the fee reimbursement or expense waiver from the total fund operating expenses. The Fund should place these additional captions directly below the "Total Annual Fund Operating Expenses" caption of the table and should use appropriate descriptive captions, such as "Fee Waiver [and/or Expense Reimbursement]" and "Total Annual Fund Operating Expenses After Fee Waiver [and/or Expense Reimbursement]," respectively. If the Fund provides this disclosure, also disclose the period for which the expense reimbursement or fee waiver arrangement is expected to continue, and briefly describe who can terminate the arrangement and under what circumstances.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse658false0rr_NetExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.02110.0211[10],[16]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse659false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue664664falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse660false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue10421042falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse661false0rr_ExpenseExampleYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue13961396falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse662false0rr_ExpenseExampleYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue22462246falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse663false0rr_ExpenseExampleNoRedemptionYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetr ue214214falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse664false0rr_ExpenseExampleNoRedemptionYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue 692692falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse665false0rr_ExpenseExampleNoRedemptionYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetru e11961196falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subparagraph f -Subsection instructions falsefalse666false0rr_ExpenseExampleNoRedemptionYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetru e22462246falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subparagraph f -Subsection instructions falsefalse667false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue 0.05360.0536falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse668false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 03650.0365falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse669false0rr_AverageAnnualReturnSinceInceptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.04010.0401falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse670false0rr_AverageAnnualReturnInceptionDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse002001-12-07falsefalsetruefalsefalseOtherxbrli:dateItemTypedateReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 4 -Subsection b falsefalse671false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse37falsefalseUSDtruefalse{dei_DocumentInformationDocumentAxis} : Prime Member {dei_LegalEntityAxis} : S000004071 Member {rr_ProspectusShareClassAxis} : C000011389 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_201112http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalsePrimedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_PrimeMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxis< /ValueType>xbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor C1 Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011389Memberrr_ProspectusShareClassAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0Uni t12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse672true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00false falsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse673false0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a pe rcentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalse674false0rr_MaximumDeferredSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1true< /IsNumeric>truetrue0.010.01[17]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge ( load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalse675false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00440.0044[10],[13]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse676false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.0080.008[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalse677false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00760.0076[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions falsefalse678false0rr_Component1OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue< NumericAmount>0.00460.0046[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse679false0rr_Component2OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.0030.003[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 10 -Subsection table falsefalse680false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.020.02[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in th e same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions falsefalse681false0rr_FeeWaiverOrReimbursementOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetr ue-0.0007-0.0007[10],[13]falsefalsefalsefalsefalseOtherrr:NonPositivePure4TypepureTotal Annual Fund Operating Expenses. If there were expense reimbursement or fee waiver arrangements that reduced any Fund operating expenses and will continue to reduce them for no less than one year from the effective date of the Fund's registration statement, a Fund may add two captions to the table one caption showing the amount of the expense reimbursement or fee waiver, and a second ca ption showing the Fund's net expenses after subtracting the fee reimbursement or expense waiver from the total fund operating expenses. The Fund should place these additional captions directly below the "Total Annual Fund Operating Expenses" caption of the table and should use appropriate descriptive captions, such as "Fee Waiver [and/or Expense Reimbursement]" and "Total Annual Fund Operating Expenses After Fee Waiver [and/or Expense Reimbursement]," respectively. If the Fund provides this disclosure, also disclose the period for which the expense reimbursement or fee waiver arrangement is expected to continue, and briefly describe who can terminate the arrangement and under what circumstances.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse682false0rr_NetExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.01930.0193[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse683false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue296296falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse684false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue606606falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse685false0rr_ExpenseExampleYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue10421042falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse686false0rr_ExpenseExampleYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue22542254falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse687false0rr_ExpenseExampleNoRedemptionYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetr ue196196falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse688false0rr_ExpenseExampleNoRedemptionYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue 606606falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse689false0rr_ExpenseExampleNoRedemptionYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetru e10421042falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subparagraph f -Subsection instructions falsefalse690false0rr_ExpenseExampleNoRedemptionYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetru e22542254falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subparagraph f -Subsection instructions falsefalse691false0rr_AnnualReturn2002rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.07970.0797falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return informatio n as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse692false0rr_AnnualReturn2003rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.03670.0367falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalse693false0rr_AnnualReturn2004rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.03490.0349falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalse694false0rr_AnnualReturn2005rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.01520.0152falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse695false0rr_AnnualReturn2006rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.03220.0322falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse696false0rr_AnnualReturn2007rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.0420.042falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return in formation as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalse697false0rr_AnnualReturn2008rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.1204-0.1204falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date retur n information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse698false0rr_AnnualReturn2009rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.15170.1517falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalse699false0rr_AnnualReturn2010rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.09110.0911falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse700false0rr_HighestQuarterlyReturnLabelrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 00highest returnfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar y ear, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse701false0rr_BarChartHighestQuarterlyReturnDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 002009-09-30falsefalsetruefalsefalseOtherxbrli:dateItemTypedateIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse702false0rr_BarChartHighestQuarterlyReturnrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.06860.0686falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, includ e the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse703false0rr_LowestQuarterlyReturnLabelrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00lowest returnfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calend ar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse704false0rr_BarChartLowestQuarterlyReturnDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse002008-09-30falsefalsetruefalsefalseOtherxbrli:dateItemTypedateIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a c alendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse705false0rr_BarChartLowestQuarterlyReturnrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.0703-0.0703falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, includ e the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse706false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue 0.08110.0811falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse707false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 03520.0352falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse708false0rr_AverageAnnualReturnSinceInceptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.03870.0387falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse709false0rr_AverageAnnualReturnInceptionDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse002001-12-07falsefalsetruefalsefalseOtherxbrli:dateItemTypedateReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 4 -Subsection b falsefalse710false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse38falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : Prime Member {dei_LegalEntityAxis} : S000004071 Member {rr_ProspectusShareClassAxis} : C000011389 Member {rr_PerformanceMeasureAxis} : Return After Taxes on Distributions 1/28/2011 - 1/28/2011 Duration_1_28_2011_To_1_28_201120http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalsePrimedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_PrimeMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor C1 Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011389Memberrr_ProspectusShareClassAxisexplicitMemberfalsefalseReturn After Taxes on Distributionsrr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldirr_AfterTaxesOnDistributionsM emberrr_PerformanceMeasureAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalse711true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefals e00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse712false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition av ailable.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.06770.0677falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse713false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 01910.0191falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse714false0rr_AverageAnnualReturnSinceInceptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.02170.0217falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse715false0rr_AverageAnnualReturnInceptionDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse002001-12-07falsefalsetruefalsefalseOtherxbrli:dateItemTypedateReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 4 -Subsection b falsefalse716false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse39falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : Prime Member {dei_LegalEntityAxis} : S000004071 Member {rr_ProspectusShareClassAxis} : C000011389 Member {rr_PerformanceMeasureAxis} : Return After Taxes on Distributions and Sale of Shares 1/28/2011 - 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1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_201173http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalsePrimedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_PrimeMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxis< /ValueType>xbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor C2 Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000037621Memberrr_ProspectusShareClassAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Un it1Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse723true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00false falsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse724false0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a pe rcentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalse725false0rr_MaximumDeferredSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1true< /IsNumeric>truetrue0.010.01[17]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge ( load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalse726false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00440.0044[10],[13]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse727false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.0050.005[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalse728false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00860.0086[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions falsefalse729false0rr_Component1OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue< NumericAmount>0.00460.0046[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse730false0rr_Component2OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.0040.004[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 10 -Subsection table falsefalse731false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.0180.018[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions falsefalse732false0rr_FeeWaiverOrReimbursementOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetr ue-0.0007-0.0007[10],[13]falsefalsefalsefalsefalseOtherrr:NonPositivePure4TypepureTotal Annual Fund Operating Expenses. If there were expense reimbursement or fee waiver arrangements that reduced any Fund operating expenses and will continue to reduce them for no less than one year from the effective date of the Fund's registration statement, a Fund may add two captions to the table one caption showing the amount of the expense reimbursement or fee waiver, and a second ca ption showing the Fund's net expenses after subtracting the fee reimbursement or expense waiver from the total fund operating expenses. The Fund should place these additional captions directly below the "Total Annual Fund Operating Expenses" caption of the table and should use appropriate descriptive captions, such as "Fee Waiver [and/or Expense Reimbursement]" and "Total Annual Fund Operating Expenses After Fee Waiver [and/or Expense Reimbursement]," respectively. If the Fund provides this disclosure, also disclose the period for which the expense reimbursement or fee waiver arrangement is expected to continue, and briefly describe who can terminate the arrangement and under what circumstances.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse733false0rr_NetExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.01730.0173[10]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse734false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue276276falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse735false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue545545falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse736false0rr_ExpenseExampleYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue939939falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse737false0rr_ExpenseExampleYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue20412041falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse738false0rr_ExpenseExampleNoRedemptionYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetr ue176176falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse739false0rr_ExpenseExampleNoRedemptionYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue 545545falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse740false0rr_ExpenseExampleNoRedemptionYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetru e939939falsefalsefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subparagraph f -Subsection instructions falsefalse741false0rr_ExpenseExampleNoRedemptionYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetru e20412041falsetruefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subparagraph f -Subsection instructions falsefalse742false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue 0.08330.0833falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse743false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 03740.0374falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse744false0rr_AverageAnnualReturnSinceInceptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.04140.0414falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse745false0rr_AverageAnnualReturnInceptionDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse002001-12-07falsefalsetruefalsefalseOtherxbrli:dateItemTypedateReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 4 -Subsection b falsefalse746false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse41falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : Prime Member {dei_LegalEntityAxis} : S000004071 Member 1/28/2011 - 1/28/2011 Duration_1_28_2011_To_1_28_20115http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalsePrimedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_PrimeMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalse747true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse748false0rr_RiskReturnHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 14pt;" class="_mt"><b><i>Key Facts about BlackRock Total Return Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Investment Objectives/Goals Include the following information, in plain English under rule 421(d) under the Securities Act, in the order and subject matter indicatedReference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 falsefalse749false0rr_ObjectiveHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Investment Objective</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse750false0rr_ObjectivePrimaryTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse< NumericAmount>00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The investment objective of the BlackRock Total Return Fund (the "Total Return Fund" or the "Fund") is to realize a total return that exceeds that of the Barclays Capital U.S. Aggregate Bond Index.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse751false0rr_ExpenseHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><i><strong>Fees and Expenses of the Fund</strong></i></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Fee Table Includes the following information, in plain English under rule 421(d) under the Securities Act, after Item 2 Fees and expenses of the Fund This table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agr ee to invest in the future, at least $[_____] in [name of fund family] funds. Shareholder Fees (fees paid directly from your investment) 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 you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be You would pay the following expenses if you did not redeem your shares The Example does not reflect sales charges (loads) on reinvested dividends [and other distributions]. If these sales charges (loads) were included, your costs would be higher. Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns ov er" its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was __% of the average value of its whole portfolio. Instructions. A.3.instructions.6 New Funds. For purposes of this Item, a "New Fund" is a Fund that does not include in Form N-1A financial statements reporting operating results or that includes financial statements for the Fund's initial fiscal year reporting operating results for a period of 6 months or less. The following Instructions apply to New Funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph d -Subsection instructions falsefalse752false0rr_ExpenseNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"><font style="font-size: 10pt;" class="_mt">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.</font></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThis table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, a t least $[_____] in [name of fund family] funds. Include the narrative explanations in the order indicated. A Fund may modify the narrative explanations if the explanation contains comparable information to that shown.The narrative explanation regarding sales charge discounts is only required by a Fund that offers such discounts and should specify the minimum level of investment required to qualify for a discount. Modify the narrative explanation to state that Fund shares are sold on a national securities exchange at the end of the time periods indicated, and that brokerage commissions for buying and selling Fund shares through a broker are not reflected.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph b -Subsection instructions falsefalse753false0rr_ShareholderFeesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="line-height: normal; margin: 0in 0in 0pt; font-family: 'Calibri','sans-serif'; font-size: 11pt;" class="MsoNormal"><b><font style="font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">Shareholder Fees <br />(fees paid directly from your investment)</font></b></p> <p style="line-height: normal; margin: 0in 0in 0pt; font-family: 'Calibri','sans-serif'; font-size: 11pt;" class="MsoNormal"><strong><font class="_mt"> </font></strong>&nbsp;</p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringShareholder Fees (fees paid directly from your investment).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subsection table falsefalse754false0rr_OperatingExpensesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="line-height: normal; margin: 0in 0in 0pt; font-family: 'Calibri','sans-serif'; font-size: 11pt;" class="MsoNormal"><b><font style="font-family: 'Arial','sans-serif'; font-size: 10pt;" class="_mt">Annual Fund Operating Expenses<br /></font></b><b><font style="font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">(expenses that you pay each year as a <br />percentage of the value of your investment)</font></b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringAnnual Fund Op erating Expenses (ongoing expenses that you pay each year as a percentage of the value of your investment)Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 7 -Subsection table falsefalse755false0rr_FeeWaiverOrReimbursementOverAssetsDateOfTerminationrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00February 1, 2012falsefalsefalsefalsefalseOtherus-types:dateStringItemTypenormalizedstringThis element represents the date of expected termination of any expense reimbursement or fee waiver arrangements that reduce any Fund operating expenses (SEC Form N-1A 2006-09-14 A.3.table.1.11 Total Annual Fund Operating Expenses A.3.instructions.3.e).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph e -Subsection instructions falsefalse756false0rr_PortfolioTurnoverHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 11pt;" class="_mt"><b>Portfolio Turnover</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 5 -Subsection instructions falsefalse757false0rr_PortfolioTurnoverTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was&nbsp;<font class="_mt">1,754%</font> of the average value of its portfolio.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subsection example falsefalse758false0rr_PortfolioTurnoverRaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse17.5417.54falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureThis element represents the rate of portfolio turnover presented as a percentage (SEC Form N-1A 2006-09-14 A.3.example.3 Portfolio Turnover A.3.instructions.5 Portfolio Turnover).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subsection example falsefalse759false0rr_ExpensesRestatedToReflectCurrentrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00The Total Annual Fund Operating Expenses have been restated to reflect as if the distribution fees had been paidfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIn a footnote to the table, disclose that the expense information in the table has been restated to reflect current fees.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Clause ii -Exhibit B -Subsection instructions falsefalse760false0rr_ExpenseExampleHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse< /DisplayZeroAsNone>00<div class="MetaData"><font style="font-size: 11pt;" class="_mt"><b>Example:</b></font></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringHeading for Expense Example.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse761false0rr_ExpenseExampleNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font class="_mt"><font style="font-size: 10pt;" class="_mt">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% </font><font style="font-size: 10pt;" class="_mt">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:</font></font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThe Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection example falsefalse762false0rr_ExpenseExampleNoRedemptionByYearCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">You would pay the following expenses if you did not redeem your shares:</font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse763false0rr_StrategyHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalse false00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Investment Strategies of the Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industr y or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse764false0rr_StrategyNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse< NumericAmount>00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The Total Return Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font></font>Both U.S. and foreign companies and governments may issue these securities.&nbsp;<font class="_mt">Under normal circumstances, the Total Return Fund invests at least 80% of its assets in bonds and invests primarily in investment grade fixed-income securities.</font> The Total Return Fund may invest in fixed-income securities of any duration or maturity.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Total Return Fund will invest most of its assets in securities issued by U.S. issuers, but may also invest a portion of its assets in securities issued by foreign issuers. The Total Return Fund may also invest in derivative securities for hedging purposes or to increase the return on its investments. The Total Return Fund may also enter into dollar rolls.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Total Return Fund may invest up to 20% of its net assets in fixed-income securities that are rated below investment grade by at least one of the recognized rating agencies or in unrated securities of equivalent credit quality.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Total Return Fund is a "feeder" fund that invests all of its assets in a corresponding "master" portfolio, the Master Total Return Portfolio ("Master Portfolio"), a series of the Master Bond LLC ("Master LLC"), a mutual fund that has the same investment objectives and strategies as the Total Return Fund. All investments will be made at the level of the Master Portfolio. This structure is sometimes called a "master/feeder" structure. The Total Return Fund's investment results will correspond directly to the investment results of the underlying Master Portfolio in which it invests. For simplicity, this Prospectus uses the term "Total Return Fund" and "Fund" to include the Master Portfolio.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse765false0rr_StrategyPortfolioConcentrationrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font style="font-size: 10pt;" class="_mt">The Total Return Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends t o achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse766false0rr_RiskHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Risks of Investing in the Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNarrative Risk Disclosure.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subsection b falsefalse767false0rr_RiskNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time.&nbsp;<font class="_mt">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.</font> The following is a summary description of certain risks of investing in the Fund.</font></p> <ul> <li><font style="font-size: 10pt;" class="_mt"><b><i>Credit Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Credit risk refers to the possibility that the issuer of a security will not be able to make payments of interest and principal when due. Changes in an issuer's credit rating or the market's perception of an issuer's creditworthiness may also affect the value of the Fund's investment in that issuer.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Derivatives Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund's use of derivatives may reduce the Fund's returns and/or increase volatility. Volatility is defined as the characteristic of a security, an index or a market to fluctuate significantly in price within a short time period. Derivatives are also subject to counterparty risk, which is the risk that the other party in the transaction will not fulfill its contractual obligation. A risk of the Fund's use of derivatives is that the fluctuations in their values may not correlate perfectly with the overall securities markets. The possible lack of a liquid secondary market for derivatives and the resulting inability of the Fund to sell or otherwise close a derivatives position could expose the Fund to losses and could make derivatives more difficult for the Fund to value accurately. Derivatives may give rise to a form of lev erage and may expose the Fund to greater risk and increase its costs.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Dollar Rolls Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Dollar rolls involve the risk that the market value of the securities that the Fund is committed to buy may decline below the price of the securities the Fund has sold. These transactions may involve leverage.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Extension Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates rise, certain obligations will be paid off by the obligor more slowly than anticipated, causing the value of these securities to fall.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Foreign Securities Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include:<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Changes in foreign currency exchange rates can affect the value of the Fund's portfolio.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Settlement and clearance procedures in certain foreign markets may result in delays in payment for or delivery of securities not typically associated with settlement and clearance of U.S. investments.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>High Portfolio Turnover Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund may engage in active and frequent trading of its portfolio securities. High portfolio turnover (more than 100%) may result in increased transaction costs to the Fund, including brokerage commissions, dealer mark-ups and other transaction costs on the sale of the securities and on reinvestment in other securities. The sale of Fund portfolio securities may result in the realization and/or distribution to shareholders of higher capital gains or losses as compared to a fund with less active trading policies. Given the frequency of sales, such gain or loss will likely be short-term capital gain or loss and, in the event of a gain, would increase an investor's tax liability unless shares are held through a tax-deferred or exempt vehicle. These effects of higher than normal portfolio turnover may adversely aff ect Fund performance. In addition, investment in mortgage dollar rolls and participation in TBA transactions may significantly increase the Fund's portfolio turnover rate. A TBA transaction is a method of trading mortgage-backed securities where the buyer and seller agree upon general trade parameters such as agency, settlement date, par amount, and price.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Interest Rate Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Interest rate risk is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall, and decrease as interest rates rise.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Junk Bonds Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Although junk bonds generally pay higher rates of interest than investment grade bonds, junk bonds are high risk investments that may cause income and principal losses for the Fund.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Market Risk and Selection Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Mortgage- and Asset-Backed Securities Risks</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Mortgage- and asset-backed securities represent interests in "pools" of mortgages or other assets, including consumer loans or receivables held in trust. Mortgage- and asset-backed securities are subject to credit, interest rate, prepayment and extension risks. These securities also are subject to risk of default on the underlying mortgage or asset, particularly during periods of economic downturn. Small movements in interest rates (both increases and decreases) may quickly and significantly reduce the value of certain mortgage-backed securities.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Prepayment Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates fall, certain obligations will be paid off by the obligor more quickly than originally anticipated, and the Fund may have to invest the proceeds in securities with lower yields.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Sovereign Debt Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Sovereign debt instruments are subject to the risk that a governmental entity may delay or refuse to pay interest or repay principal on its sovereign debt, due, for example, to cash flow problems, insufficient foreign currency reserves, political considerations, the relative size of the governmental entity's debt position in relation to the economy or the failure to put in place economic reforms required by the International Monetary Fund or other multilateral agencies.<br /><br /></font></li></ul></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringNarrative Risk Disclosure. A Fund may, in responding to this Item, describe the types of investors for whom the Fund is intended or the types of investment goals that may be consistent with an investment in the Fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph i -Clause instruction -Subsection b falsefalse768false0rr_RiskLoseMoneyrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringSummarize the principal risks of investing in the Fund, including the risks to which the Fund's portfolio as a whole is subject and the circumstances reasonably likely to affect adversely the Fund's net asset value, yield, and total return. Unless the Fund is a Money Market Fund, disclose that loss of money is a r isk of investing in the Fund. A Fund may, in responding to this Item, describe the types of investors for whom the Fund is intended or the types of investment goals that may be consistent with an investment in the Fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph i -Subsection b falsefalse769false0rr_BarChartAndPerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><i><strong>Performance Information</strong></i></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse770false0rr_PerformanceNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalse false00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font></font>The table compares the Fund's performance to that of the Barclays Capital U.S. Aggregate Bond Index. Effective September 24, 2007, the Total Return Fund reorganized with BlackRock Total Return Portfolio (the "Predecessor Fund"), a series of BlackRock Funds II (the "Reorganization"), and the Predecessor Fund's performance and financial history has been adopted by the Total Return Fund and will be used going forward from the date of the Reorganization. The information below is based on the performance information of the combined fund resulting from the Reorganization and that of the Predecessor Fund prior to the Reorganization (adjusted as necessary to reflect the fees applicable to each class of shar es). Prior to September 24, 2007, Investor A1, Investor B1, Investor C1 and Investor C2 Share performance results are those of BlackRock Shares of the Predecessor Fund restated to reflect Investor A1, Investor B1, Investor C1 and Investor C2 fees, respectively. Prior to September 24, 2007, Investor B2 Share performance results are those of Investor B Shares of the Predecessor Fund with no adjustments.&nbsp;<font class="_mt">As with all such investments, past performance (before and after taxes) is not an indication of future results.</font>&nbsp;<font class="_mt"><font class="_mt">Sales charges are not reflected in the bar chart.</font> If they were, returns would be less than those shown.</font>&nbsp;<font class="_mt">However, the table includes all applicable fees and sales charges.</font> If the Fund's investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund's returns would have been lower. Updated information on the Fund's performance can be obtained by visiting&nbsp;<font class="_mt">http://www.blackrock.com/funds</font> or can be obtained by phone at <font class="_mt"><font style="font-size: 10pt;" class="_mt">800-882-0052.</font></font></font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse771false0rr_PerformanceInformationIllustratesVariabilityOfReturnsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInclude the bar chart and table required by paragraphs (b)(2)(ii) and (iii) of this section. Provide a brief explanation of how the information illustrates the variability of the Fund's ret urns (e.g., by stating that the information provides some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for 1, 5, and 10 years compare with those of a broad measure of market performance). Provide a statement to the effect that the Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse772false0rr_PerformanceAvailabilityPhonerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font style="font-size: 10pt;" class="_mt">800-882-0052.</font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf applicable, include a statement explaining that updated performance information is available and providing a Web site address and/or toll-free (or collect) telephone number where the updated information may be obtained.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse773false0rr_PerformanceAvailabilityWebSiteAddressrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00http://www.blackrock.com/fundsfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf applicable, include a statement explaining that updated performance information is available and providing a Website address and/or toll-free (or collect) telephone number where the updated information may be obtained.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse774false0rr_PerformancePastDoesNotIndicateFuturerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00As with all such investments, past performance (before and after taxes) is not an indication of future results.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInclude the bar chart and table required by paragraphs (b)(2)(ii) and (iii) of this section. Provide a brief explanation of how the information illustrates the variability of the Fund's returns (e.g., by stating that the information provides some indication of the risks of investing in th e Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for 1, 5, and 10 years compare with those of a broad measure of market performance). Provide a statement to the effect that the Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse775false0rr_BarChartHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="center"><font style="font-size: 11pt;" class="_mt"><b>Investor C1 Shares<br />ANNUAL TOTAL RETURNS<br />BlackRock Total Return Fund<br />As of 12/31</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse776false0rr_BarChartDoesNotReflectSalesLoadsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font class="_mt">Sales charges are not reflected in the bar chart.</font> If they were, returns would be less than those shown.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInclude the bar chart and table required by Item 4 (b)(2)(ii) and (iii) of this section. Provide a brief explanation of how the information illustrates the variability of the Fund's returns (e.g., by stating that the information provides some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for 1, 5, and 10 years compare with those of a broad measure of market performance). Provide a statement to the effect that the Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Provide annual total returns beginning with the earliest calendar year. Calculate annual returns using the Instructions to Item 8(a), except that the calculations should be based on calendar years. If a Fund's shares are sold subject to a sales load or account fees, state that sales loads or account fees are not reflected in the bar chart and that, if these amounts were reflected, returns would be less than those shown.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b falsefalse777false0rr_BarChartClosingTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsef alse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">During the period shown in the bar chart, the&nbsp;<font class="_mt">highest return</font> for a quarter was&nbsp;<font class="_mt">6.86%</font> (quarter ended September 30, 2009) and the&nbsp;<font class="_mt">lowest return</font> for a quarter was&nbsp;<font class="_mt">-7.03%</font> (quarter ended September 30, 2008).</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse778false0rr_PerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"><strong><font class="_mt"><font size="2" class="_mt">As of 12/31/10<br /></font><font style="font-size: 9pt;" class="_mt">Average Annual Total Returns</font></font></strong> </div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringThis item represents Average Anuual Total Returns. If a Multiple Class Fund offers a Class in the prospectus that converts into another Class after a stated perio d, compute average annual total returns in the table by using the returns of the other Class for the period after conversion.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit c -Subsection b falsefalse779false0rr_PerformanceTableDoesReflectSalesLoadsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00However, the table includes all applicable fees and sales charges.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf the Fund has annual returns for at least one calendar year, provide a table showing the Fund's (A) average annual total return; (B) average annual total return (after taxes on distributions); and (C) average annual total return (after taxes on distributions and redemption). A Money Market Fund should show only the returns described in clause (A) of t he preceding sentence. All returns should be shown for 1-, 5-, and 10- calendar year periods ending on the date of the most recently completed calendar year (or for the life of the Fund, if shorter), but only for periods subsequent to the effective date of the Fund's registration statement. The table also shouldshow the returns of an appropriate broadbased securities market index as defined in Instruction 5 to Item 22(b)(7) for the same periods. A Fund that has been in existence for more than 10 years also may include returns for the life of the Fund. A Money Market Fund may provide the Fund's 7-day yield ending on the date of the most recent calendar year or disclose a toll-free (or collect) telephone number that investors can use to obtain the Fund's current 7-day yield. For a Fund (other than a Money Market Fund or a Fund described in General Instruction C.3.(d)(iii)), provide the information in the following table with the specified captions AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31 , _____)Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Subsection b falsefalse780false0rr_PerformanceTableUsesHighestFederalRaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font style="font-size: 10pt;" class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes.&nbsp;</font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringProvide a brief explanation that after-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Subsection b falsefalse781false0rr_PerformanceTableNotRelevantToTaxDeferredrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or IRAs.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringProvide a brief explanation that the actual after-tax returns depend on an investor's tax situation and may differ from those shown, and after-tax returns s hown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iv -Clause B -Subsection b falsefalse782false0rr_PerformanceTableOneClassOfAfterTaxShownrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00After-tax returns are shown for Investor C1 Shares only, and the after-tax returns for Investor A1, Investor B1, Investor B2 and Investor C2 Shares will vary.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringProvide a brief explanation that if the Fund is a Multiple Class Fund that offers more than one Class in the prospectus, after-tax returns are shown for only one Class and after-tax returns for other Classes will vary.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Subsection b Reference 2: 2 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iv -Clause C -Subsection b falsefalse783false0rr_PerformanceTableNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes.&nbsp;</font></font><font class="_mt">Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or IRAs.</font> <font class="_mt">After-tax returns are shown for Investor C1 Shares only, and the after-tax returns for Investor A1, Investor B1, Investor B2 and Investor C2 Shares will vary.</font></font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIf the Fund has annual returns for at least one calendar year, provide a table showing the Fund's (A) average annual total return; (B) average annual total return (after taxes on distributions); and (C) average annual total return (after taxes on distributions and redemption). A Money Market Fund should show only the returns described in clause (A) of the preceding sentence. All returns should be shown for 1-, 5-, and 10- calendar year periods ending on the date of the most recently completed calendar year (or for the life of the Fund, if shorter), but only for periods subsequent to the effective date of the Fund's registration statement. The table also shouldshow the return s of an appropriate broadbased securities market index as defined in Instruction 5 to Item 22(b)(7) for the same periods. A Fund that has been in existence for more than 10 years also may include returns for the life of the Fund. A Money Market Fund may provide the Fund's 7-day yield ending on the date of the most recent calendar year or disclose a toll-free (or collect) telephone number that investors can use to obtain the Fund's current 7-day yield. For a Fund (other than a Money Market Fund or a Fund described in General Instruction C.3.(d)(iii)), provide the information in the following table with the specified captions AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, _____). For a Fund that provides annual total returns for only one calendar year or for a Fund that does not include the bar chart because it does not have annual returns for a full calendar year, modify, as appropriate, the narrative explanation required by paragraph (c)(2)(i) (e.g., by stating that the information gives so me indication of the risks of an investment in the Fund by comparing the Fund's performance with a broad measure of market performance).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iv -Subsection b falsefalse784false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse42falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : Prime Member {dei_LegalEntityAxis} : S000004071 Member {rr_PerformanceMeasureAxis} : Barclays Capital U S Aggregate Bond Index Reflects No Deduction For Fees Expenses Or Taxes Member 1/28/2011 - 1/28/2011 Duration_1_28_2011_To_1_28_201125http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalsePrimedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_PrimeMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseBarclays Capital U.S. Aggregate Bond Index (Reflects no deduction for fees, expenses or taxes)rr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_BarclaysCapitalUSAggregateBondIndexReflectsNoDeductionForFeesExpensesOrTaxesMemberrr_PerformanceMeasureAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalse785true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse786false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.06540.0654falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse787false0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0. 0580.058falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse788false0rr_AverageAnnualReturnSinceInceptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.05610.0561falsefalsefalsefalsefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalse1 A contingent deferred sales charge ("CDSC") of 0.75% is assessed on certain redemptions of Investor A Shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase of an investment of $1,000,000 or more.2 The CDSC is 4.00% if shares are redeemed within two years. The CDSC for Investor B Shares decreases for redemptions made in subsequent years. After six years there is no CDSC on Investor B Shares. (See the section "Details about the Share Classes &#8212; Investor B Shares" for the complete schedule of CDSCs.)3 There is no CDSC on Investor C Shares after one year.4A CDSC of 0.75% is assessed on certain redemptions of Investor A Shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase of an investment of $1,000,000 or more.5As described in the "Management of the Funds" section of the Fund's prospectus on page 44, BlackRock has contractually agreed to waive the Total Return Fund's management fee in the amount of the Total Return Fund's share of the management fee paid by the Master Portfolio for as long as the Total Return Fund invests in the Master Portfolio. In addition, BlackRock has contractually agreed to waive and/or reimburse fees or expenses in order to limit Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements (excluding Dividend Expense, Interest Expense, Acquired Fund Fees and Expenses and certain other Fund expenses) to 0.90 % (for Investor A Shares), 1.65% (for Investor C Shares), 0.55% (for Institutional Shares) and 1.10% (for Class R Shares) of average daily net assets until February 1, 2012. These contractual agreements may be terminated upon 90 days' notice by a majority of the non-interested directors of the Fund or by a vote of a majority of the outstanding voting securities of the Fund.6The fees and expenses shown in the table and the example that follows include both the expenses of Total Return Fund and Total Return Fund's share of the allocated expenses of Master Total Return Portfolio (the "Master Portfolio").7The CDSC is 4.00% if shares are redeemed within two years. The CDSC for Investor B Shares decreases for redemptions made in subsequent years. After six years there is no CDSC on Investor B Shares. (See the section "Details about the Share Classes &#8212; Investor B Shares" for the complete schedule of CDSCs .)8There is no CDSC on Investor C Shares after one year.9 There is no contingent deferred sales charge ("CDSC") on Investor C1 Shares after one year.10The fees and expenses shown in the table and the example that follows include both the expenses of the Fund and the Fund's share of the allocated expenses of Master Total Return Portfolio (the "Portfolio").11As described in the "Management of the Fund" section of the Fund's prospectus on page 24, BlackRock has contractually agreed to waive the Total Return Fund's management fee in the amount of the Total Return Fund's share of the management fee paid by the Master Portfolio for as long as the Total Return Fund invests in the Master Portfolio. In addition, BlackRock has contractually agreed to waive and/or reimburse fees and/or expenses in order to limit Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements (excluding Dividend Expense, Interest Expense, Acquired Fund Fees and Expenses an d certain other Fund expenses) to 0.85% of average daily net assets until February 1, 2012. These contractual agreements may be terminated upon 90 days' notice by a majority of the non-interested directors of the Fund or by a vote of a majority of the outstanding voting securities of the Fund.12As described in the "Management of the Fund" section of the Fund's prospectus on page 23, BlackRock has contractually agreed to waive the Total Return Fund's management fee in the amount of the Total Return Fund's share of the management fee paid by the Master Portfolio for as long as the Total Return Fund invests in the Master Portfolio. In addition, BlackRock has contractually agreed to waive and/or reimburse fees and/or expenses in order to limit Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements (excluding Dividend Expense, Interest Expense, Acquired Fund Fees and Expenses and certain other Fund expenses) to 0.40% of average daily net assets until February 1, 2012. These contractual agreements may be terminated upon 90 days notice by a majority of the non-interested directors of the Fund or by a vote of a majority of the outstanding voting securities of the Fund.13As described in the "Management of the Funds" section of the Fund's prospectus on page 33, BlackRock has contractually agreed to waive the Total Return Fund's management fee in the amount of the Total Return Fund's share of the management fee paid by the Master Portfolio for as long as the Total Return Fund invests in the Master Portfolio. In addition, BlackRock has contractually agreed to waive and/or reimburse fees and/or expenses in order to limit Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements (excluding Dividend Expense, Interest Expense, Acquired Fund Fees and Expenses and certain other Fund expenses) to 1.65% (for Investor B2 Shares) of average daily net assets until February 1, 2 012. These contractual agreements may be terminated upon 90 days' notice by a majority of the non-interested directors of the Fund or by a vote of a majority of the outstanding voting securities of the Fund.14A contingent deferred sales charge ("CDSC") of 1.00% is assessed if shares are redeemed within one year. The CDSC for Investor B1 Shares decreases for redemptions made in subsequent years. After three years there is no CDSC on Investor B1 Shares.15The CDSC is 4.50% if shares are redeemed within one year. The CDSC for Investor B2 Shares decreases for redemptions made in subsequent years. After six years there is no CDSC on Investor B2 Shares.16For the year ended September 30, 2010, the Investor B2 Shares did not pay distribution fees due to regulatory fee limits. The Total Annual Fund Operating Expenses have been restated to reflect as if the distributio n fees had been paid.17There is no CDSC on Investor C1 and Investor C2 Shares after one year.1787Risk/Return Detail Data (USD $)NoRoundingUnKnownUnKnownUnKnowntruetrue XML 15 R18.xml IDEA: Risk/Return Summary - BlackRock Total Return Fund (Prime) 2.2.0.25truefalse001152 - Document - Risk/Return Summary {Unlabeled} - BlackRock Total Return Fund (Prime)falsefalsetrue1falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : Prime Member {dei_LegalEntityAxis} : S000004071 Member 1/28/2011 - 1/28/2011 Duration_1_28_2011_To_1_28_20115http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalsecik000276463_PrimeMemberdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_PrimeMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalsecik000276463_S000004071Memberdei_LegalEntityA xisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli01false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://www.blackrock.com/role/documentriskreturnsummaryunlabeledblackrocktotalreturnfundprime1falsefalsefalse00Prime | BlackRock Total Return FundPrime | BlackRock Total Return Fundfalsefalsefalsefalsefalse1falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : Prime Member {dei_LegalEntityAxis} : S000004071 Member 1/28/2011 - 1/28/2011 Duration_1_28_2011_To_1_28_20115http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalsecik000276463_PrimeMemberdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_PrimeMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalsecik000276463_S000004071Memberdei_LegalEntityA xisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalse3false0rr_RiskReturnHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 14pt;" class="_mt"><b><i>Key Facts about BlackRock Total Return Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Investment Objectives/Goals Include the following information, in plain English under rule 421(d) under the Securities Act, in the order and subject matter indicatedReference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 falsefalse4false0rr_ObjectiveHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Investment Objective</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse5false0rr_ObjectivePrimaryTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The investment objective of the BlackRock Total Return Fund (the "Total Return Fund" or the "Fund") is to realize a total return that exceeds that of the Barclays Capital U.S. Aggregate Bond Index.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse6false0rr_ExpenseHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><i><strong>Fees and Expenses of the Fund</strong></i></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Fee Table Includes the following information, in plain English under rule 421(d) under the Securities Act, after Item 2 Fees and expenses of the Fund This table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agr ee to invest in the future, at least $[_____] in [name of fund family] funds. Shareholder Fees (fees paid directly from your investment) 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 you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be You would pay the following expenses if you did not redeem your shares The Example does not reflect sales charges (loads) on reinvested dividends [and other distributions]. If these sales charges (loads) were included, your costs would be higher. Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns ov er" its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was __% of the average value of its whole portfolio. Instructions. A.3.instructions.6 New Funds. For purposes of this Item, a "New Fund" is a Fund that does not include in Form N-1A financial statements reporting operating results or that includes financial statements for the Fund's initial fiscal year reporting operating results for a period of 6 months or less. The following Instructions apply to New Funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph d -Subsection instructions falsefalse7false0rr_ExpenseNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"><font style="font-size: 10pt;" class="_mt">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.</font></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThis table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $[_____] in [name of fund family] funds. Include the narrative explanations in the order indicated. A Fund may modify the narrative explanations if the explanation contains comparable information to that shown.The narrative explanation regarding sales charge discounts is only required by a Fund that offers such discounts and should specify the minimum level of investment required to qualify for a discount. Modify the narrative explanation to state that Fund shares are sold on a national securities exchange at the end of the time periods indicated, and that brokerage commissions for buying and selling Fund shares through a broker are not reflected.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph b -Subsection instructions falsefalse8false0rr_ShareholderFeesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="line-height: normal; margin: 0in 0in 0pt; font-family: 'Calibri','sans-serif'; font-size: 11pt;" class="MsoNormal"><b><font style="font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">Shareholder Fees <br />(fees paid directly from your investment)</font></b></p> <p style="line-height: normal; margin: 0in 0in 0pt; font-family: 'Calibri','sans-serif'; font-size: 11pt;" class="MsoNormal"><strong><font class="_mt"> </font></strong>&nbsp;</p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringShareholder Fees (fees paid directly from your investment).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subsection table falsefalse9false0rr_ShareholderFeesTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleShareholderFeesBlackrockTotalReturnFundPrime column period compact * column dei_DocumentInformationDocumentAxis compact cik000276463_PrimeMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleShareholderFeesBlackrockTotalReturnFundPrime column period compact * column dei_DocumentInformationDocumentAxis compact 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SharesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$5falseColumnperiodPeriod*Columndei_DocumentInformationDocumentAxisAxiscik000276463_PrimeMemberColumndei_LegalEntityAxisAxiscik000276463_S000004071MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*duration2011-01-28T00:00:002011-01-28T00:00:00falsefalsePrimedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_PrimeMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor C2 Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000037621Memberrr_ProspectusShareClassAxisexplicitMemberPrimeBlackRock Total Return FundInvestor C2 SharesUnit12Standardhttp://www.xbrl.org/2003/iso4217< /MeasureSchema>USDiso42170falseUSDfalsefalse$1falseRowprimaryElement*5false0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsetruefalse2truetruetrue0.010.01falsefalsefalsetruefalse3truetruetrue00falsefalsefalsetruefalse4truetruetrue00falsefalsefalsetruefalse5truetruetrue00falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalse0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricetruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.010.01falsefalsefalsetruefalse2truetruetrue00falsefalsefalsetruefalse3truetruetrue00falsefalsefalsetruefalse4truetruetrue00falsefalsefalsetruefalse5truetruetrue00falsefalsefalsetruefalseOthernanafalsefalse2falseRowprimaryElement*6false0rr_MaximumDeferredSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.010.01[3]falsefalsefalsetruefalse2truetruetrue00falsefalsefalsetruefalse3truetruetrue0.010.01[1]falsefalsefalsetruefalse4truetruetrue0.010.01[3]falsefalsefalsetruefalse5truetruetrue0.0450.045[2]falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabula r presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalse0rr_MaximumDeferredSalesChargeOverOfferingPricetruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsetruefalse2truetruetrue0.010.01[1]falsefalsefalsetruefalse3truetruetrue< /DisplayZeroAsNone>0.0450.045[2]falsefalsefalsetruefalse4truetruetrue0.010.01[3]falsefalsefalsetruefalse5truetruetrue0.010.01[3]falsefalsefalsetruefalseOthernanafalsefalse1A contingent deferred sales charge ("CDSC") of 1.00% is assessed if shares are redeemed within one year. The CDSC for Investor B1 Shares decreases for redemptions made in su bsequent years. After three years there is no CDSC on Investor B1 Shares.2The CDSC is 4.50% if shares are redeemed within one year. The CDSC for Investor B2 Shares decreases for redemptions made in subsequent years. After six years there is no CDSC on Investor B2 Shares.3There is no CDSC on Investor C1 and Investor C2 Shares after one year.52Shareholder Fees - BlackRock Total Return Fund (Prime) Prime BlackRock Total Return FundUnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*Columndei_DocumentInformationDocumentAxisAxiscik000276463_PrimeMemberColumndei_LegalEntityAxisAxiscik000276463_S000004071MemberColumnrr_Pro spectusShareClassAxisAxis*ColumnunitUnit*RowprimaryElement*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to ShareholderFeesData.No authoritative reference available.falsefalse10false0rr_OperatingExpensesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="line-height: normal; margin: 0in 0in 0pt; font-family: 'Calibri','sans-serif'; font-size: 11pt;" class="MsoNormal"><b><font style="font-family: 'Arial','sans-serif'; font-size: 10pt;" class="_mt">Annual Fund Operating Expenses<br /></font></b><b><font style="font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">(expenses that you pay each year as a <br />percentage of the value of your investment)</font></b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringAnnual Fund Op erating Expenses (ongoing expenses that you pay each year as a percentage of the value of your investment)Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 7 -Subsection table falsefalse11false0rr_AnnualFundOperatingExpensesTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualFundOperatingExpensesBlackrockTotalReturnFundPrime column period compact * column dei_DocumentInformationDocumentAxis compact cik000276463_PrimeMember column dei_LegalEntityAxis 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SharesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$5falseColumnperiodPeriod*Columndei_DocumentInformationDocumentAxisAxiscik000276463_PrimeMemberColumndei_LegalEntityAxisAxiscik000276463_S000004071MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*duration2011-01-28T00:00:002011-01-28T00:00:00falsefalsePrimedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_PrimeMemberdei_DocumentInformationDocumentAxisexplicitMemberfals efalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor C2 Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000037621Memberrr_ProspectusShareClassAxisexplicitMemberPrimeBlackRock Total Return FundInvestor C2 SharesUnit12Standard http://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$1falseRowprimaryElement*5false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00440.0044[1],[3]falsefalsefalsetruefalse2truetruetrue0.00440.0044[1],[3]falsefalsefalsetruefalse3truetruetrue0.00440.0044[1],[3]falsefalsefalsetruefalse4truetruetrue0.00440.0044[1],[3]falsefalsefalsetruefalse5< /Id>truetruetrue0.00440.0044[1],[3]falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse0rr_ManagementFeesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[1][2]1truetruetrue0.00440.0044< NonNumbericText />falsefalsefalsetruefalse2truetruetrue0.00440.0044falsefalsefalsetruefalse3truetruetrue0.00440.0044falsefalsefalsetruefalse4truetruetrue0.00440.0044falsefalsefalsetruefalse5truetruetrue0.00440.0044falsefalsefalsetruefalseOthernanafalsefalse2falseRowprimaryElement*6false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.0080.008[3]falsefalsefalsetruefalse2truetruetrue0.0010.001[3]falsefalsefalsetruefalse3truetruetrue0.0050.005[3]falsefalsefalsetruefalse4truetruetrue0.0050.005[3]falsefalsefalsetruefalse5truetruetrue0.010.01[2],[3]falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalse0rr_DistributionAndService12b1FeesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[2]1truetruetrue0.0010.001falsefalsefalsetruefalse2truetruetrue0.0050.005falsefalsefalsetruefalse3truetruetrue0.010.01[3]falsefalsefalsetruefalse4truetruetrue0.0080.008falsefalsefalsetruefalse5truetruetrue0.0050.005falsefalsefalsetruefalseOthernanafalsefalse3falseRowprimaryElement*7false0rr_OtherExpensesOverA ssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truetruetrue0.00760.0076[3]falsefalsefalsetruefalse2truetruetrue0.00730.0073[3]falsefalsefalsetruefalse3truetruetrue0.00840.0084[3]falsefalsefalsetruefalse4truetruetrue0.00860.0086[3]falsefalsefalsetruefalse5truetruetrue0.00890.0089[3]falsefalsefalsetruefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions truefalse0rr_OtherExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[2]1truetruetrue0.00730.0073falsefalsefalsetruefalse2truetruetrue0.00840.0084falsefalsefalsetruefalse3truetruetrue0.00890.0089falsefalsefalsetruefalse4truetruetrue0.00760.0076falsefalsefalsetruefalse5truetruetrue0.00860.0086falsefalsefalsetruefalseOthernanafalsefalse4falseRowprimaryElement*8false0rr_Component1OtherExpensesOverAssetsrr falsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00460.0046[3]falsefalsefalsetruefalse2truetruetrue0.00460.0046[3]falsefalsefalsetruefalse3truetruetrue0.00460.0046[3]falsefalsefalsetruefalse4truetruetrue0.00460.0046[3]falsefalsefalsetruefalse5truetruetrue0.00460.0046[3]falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse0rr_Component1OtherExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[2]1truetruetrue0.00460.0046falsefalsefalsetruefalse2truetruetrue0.00460.0046falsefalsefalsetruefalse3truetruetrue0.00460.0046falsefalsefalsetruefalse4truetruetrue0.00460.0046falsefalsefalsetruefalse5truetruetrue0.00460.0046falsefalsefalsetruefalseOthernanafalsefalse5falseRowprimaryElement*9false0rr_Component2OtherExpensesOverAssetsrr falsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.0030.003[3]falsefalsefalsetruefalse2truetruetrue0.00270.0027[3]falsefalsefalsetruefalse3truetruetrue0.00380.0038[3]falsefalsefalsetruefalse4truetruetrue0.0040.004[3]falsefalsefalsetruefalse5truetruetrue0.00430.0043[3] falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 10 -Subsection table falsefalse0rr_Component2OtherExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[2]1truetruetrue0.00270.0027falsefalsefalsetruefalse2truetruetrue0.00380.0038falsefalsefalsetruefalse3truetruetrue0.00430.0 043falsefalsefalsetruefalse4truetruetrue0.0030.003falsefalsefalsetruefalse5truetruetrue0.0040.004falsefalsefalsetruefalseOthernanafalsefalse6falseRowprimaryElement*11false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truetruetrue0.020.02[3]falsefalsefalsetruefalse2truetruetrue0.01270.0127[3]falsefalsefalsetruefalse3truetruetrue0.01780.0178[3]falsefalsefalsetruefalse4truetruetrue0.0180.018[3]falsefalsefalsetruefalse5truetruetrue0.02330.0233[2],[3]falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred durin g the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions truefalse0rr_ExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[2]1truetruetrue0.01270.0127falsefalsefalsetruefalse2truetruetrue0.01780.0178falsefalsefalsetruefalse3truetruetrue0.02330.0233[3]falsefalsefalsetruefalse4truetruetrue0.020.02falsefalsefalsetruefalse5truetruetrue0.0180.018falsefalsefalsetruefalseOthernanafalsefalse7falseRowprimaryElement*12false0rr_FeeWaiverOrReimbursementOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue-0.0007-0.0007[1],[3]falsefalsefalsetruefalse2truetruetrue-0.0007-0.0007[1],[3]falsefalsefalsetruefalse3truetruetrue-0.0007-0.0007[1],[3]falsefalsefalsetruefalse4truetruetrue-0.0007-0.0007[1],[3]falsefalsefalsetruefalse5truetruetrue-0.0022-0.0022[1],[3]falsefalsefalsetruefalseOtherrr:NonPositivePure4TypepureTotal Annual Fund Operating Expenses. If there were expense reimbursement or fee waiver arrangements that reduced any Fund operating expenses and will continue to reduce them for no less than one year from the effective date of the Fund's registration statement, a Fund may add two captions to the table one caption showing the amount of the expense reimbursement or fee waiver, and a second caption showing the Fund's net expenses after subtracting the fee reimbursement or expense waiver from the total fund operating expenses. The Fund should place the se additional captions directly below the "Total Annual Fund Operating Expenses" caption of the table and should use appropriate descriptive captions, such as "Fee Waiver [and/or Expense Reimbursement]" and "Total Annual Fund Operating Expenses After Fee Waiver [and/or Expense Reimbursement]," respectively. If the Fund provides this disclosure, also disclose the period for which the expense reimbursement or fee waiver arrangement is expected to continue, and briefly describe who can terminate the arrangement and under what circumstances.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse0rr_FeeWaiverOrReimbursementOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[1][2]1truetruetrue-0.0007-0.0007falsefalsefalsetruefalse2truetruetrue-0.0007-0.0007falsefalsefalsetruefalse3truetruetrue-0.0022-0.0022falsefalsefalsetruefalse4truetruetrue-0.0007-0.0007falsefalsefalsetruefalse5truetruetrue-0.0007-0.0007falsefalsefalsetruefalseOthernanafalsefalse8falseRowprimaryElement*13false0rr_NetExpensesOver AssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truetruetrue0.01930.0193[3]falsefalsefalsetruefalse2truetruetrue0.0120.012[3]falsefalsefalsetruefalse3truetruetrue0.01710.0171[3]falsefalsefalsetruefalse4truetruetrue0.01730.0173[3]falsefalsefalsetruefalse5truetruetrue0.02110.0211[2],[3]falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table truefalse0rr_NetExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[2]1truetruetrue0.0120.012falsefalsefalsetruefalse2truetruetrue0.01710.0171falsefalsefalsetruefalse3truetruetrue0.0211 0.0211[3]falsefalsefalsetruefalse4truetruetrue0.01930.0193falsefalsefalsetruefalse5truetruetrue0.01730.0173falsefalsefalsetruefalseOthernanafalsefalse1As described in the "Management of the Funds" section of the Fund's prospectus on page 33, BlackRock has contractually agreed to waive the Total Return Fund's management fee in the amount of the Total Return Fund's share of the management fee paid by the Master Portfoli o for as long as the Total Return Fund invests in the Master Portfolio. In addition, BlackRock has contractually agreed to waive and/or reimburse fees and/or expenses in order to limit Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements (excluding Dividend Expense, Interest Expense, Acquired Fund Fees and Expenses and certain other Fund expenses) to 1.65% (for Investor B2 Shares) of average daily net assets until February 1, 2012. These contractual agreements may be terminated upon 90 days' notice by a majority of the non-interested directors of the Fund or by a vote of a majority of the outstanding voting securities of the Fund.2The fees and expenses shown in the table and the example that follows include both the expenses of the Fund and the Fund's share of the allocated expenses of Master Total Return Portfolio (the "Portfolio").3For the year ended September 30, 2010, the Investor B2 Shares did not pay distribution fees due to regulatory fee limits. The Total Annual Fund Operating Expenses have been restated to reflect as if the distribution fees had been paid.58Annual Fund Operating Expenses - BlackRock Total Return Fund (Prime) Prime BlackRock Total Return FundUnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*Columndei_DocumentInformationDocumentAxisAxiscik000276463_PrimeMemberColumndei_LegalEntityAxisAxiscik000276463_S000004071MemberColumnrr_Pro spectusShareClassAxisAxis*ColumnunitUnit*RowprimaryElement*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to OperatingExpensesData.No authoritative reference available.falsefalse12false0rr_ExpenseExampleHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"><font style="font-size: 11pt;" class="_mt"><b>Example:</b></font></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringHeading for Expense Example.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse13false0rr_ExpenseExampleNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font class="_mt"><font style="font-size: 10pt;" class="_mt">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% </font><font style="font-size: 10pt;" class="_mt">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:</font></font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThe Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection example falsefalse14false0rr_ExpenseExampleWithRedemptionTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockTotalReturnFundPrime row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_PrimeMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockTotalReturnFundPrime row period compact * row primary compact * column dei_DocumentInformationDocumentAx is compact cik000276463_PrimeMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>truehttp://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockTotalReturnFundPrimefalsefalse001176 - Schedule - Expense Example {Transposed} - BlackRock Total Return Fund (Prime)truefalsefalse1falseColumnperiodPeriod*ColumnprimaryElement*5false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue296296falsefalsefalsetruefalse2truefalsetrue221221falsefalsefalsetruefalse3truefalse< DisplayZeroAsNone>true274274falsefalsefalsetruefalse4truefalsetrue276276falsefalsefalsetruefalse5truefalsetrue664664falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*6fals e0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue606606falsefalsefalsetruefalse2truefalsetrue477477falsefalsefalsetruefalse3truefalsetrue564564falsefalsefalsetruefalse4truefalsetrue545545falsefalsefalsetruefalse5truefalsetrue10421042falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$3falseColumnperiodPeriod*ColumnprimaryElement*7fa lse0rr_ExpenseExampleYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue10421042falsefalsefalsetruefalse2truefalsetrue753753falsefalsefalsetruefalse3truefalsetrue928928falsefalsefalsetruefalse4truefalsetrue939939falsefalsefalsetruefalse5truefalsetrue13961396falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$4falseColumnperiodPeriod*ColumnprimaryElement*8fa lse0rr_ExpenseExampleYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue22542254falsefalsefalsetruefalse2truefalsetrue15401540falsefalsefalsetruefalse3truefalsetrue20192019falsefalsefalsetruefalse4truefalsetrue20412041falsefalsefalsetruefalse5truefalsetrue22462246falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$1falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_PrimeMemberRowdei_LegalEntityAxisAxiscik000276463_S00000407 1MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalsePrimedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_PrimeMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor A1 Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000037618Memberrr_ProspectusShareClassAxisexplicitMemberPrimeBlackRock Total Return FundInvestor A1 SharesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse 1truefalsetrue221221falsefalsefalsetruefalse2truefalsetrue477477falsefalsefalsetruefalse3truefalsetrue753753falsefalsefalsetruefalse4truefalsetrue15401540falsefalsefalsetruefalseOthernanafalsefalse2falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_PrimeMemberRowdei_LegalEntityAxisAxiscik000276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnitcik000276463_PrimeMemberRowdei_LegalEntityAxisAxiscik000276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalsePrimedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_PrimeMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor B2 Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000052629Memberrr_ProspectusShareClassAxisexplicitMemberPrimeBlackRock Total Return FundInvestor B2 SharesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue664664falsefalsefalsetruefalse2truefalsetrue10421042falsefalsefalsetruefalse3truefalsetrue13961396falsefalsefalsetruefalse4truefalsetrue22462246falsefalsefalsetruefalseOthernanafalsefalse4falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_PrimeMemberRowdei_LegalEntityAxisAxiscik000276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalsePrimedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_PrimeMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Fundd ei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor C1 Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011389Memberrr_ProspectusShareClassAxisexplicitMemberPrimeBlackRock Total Return FundInvestor C1 SharesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421 700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue296296falsefalsefalsetruefalse2truefalsetrue606606falsefalsefalsetruefalse3truefalsetrue10421042falsefalsefalsetruefalse4truefalsetrue22542254falsefalsefalsetruefalseOthernanafalsefalse5falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_PrimeMemberRowdei_LegalEntityAxisAxiscik000276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalsePrimedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_PrimeMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor C2 Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000037621Memberrr_ProspectusShareClassAxisexplicitMemberPrimeBlackRock Total Return FundInvestor C2 SharesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue276276falsefalsefalsetruefalse2truefalsetrue545545falsefalsefalsetruefalse3truefalsetrue939939f alsefalsefalsetruefalse4truefalsetrue20412041falsefalsefalsetruefalseOthernanafalsefalse45Expense Example - BlackRock Total Return Fund (Prime) Prime BlackRock Total Return Fund (USD $)UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*Rowdei_DocumentInformationDocumentAxisAxiscik000276463_PrimeMemberRowdei_LegalEntityAxis Axiscik000276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to ExpenseExample.No authoritative reference available.falsefalseExpense Example, With Redemption [Table]15false0rr_ExpenseExampleNoRedemptionByYearCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">You would pay the following expenses if you did not redeem your shares:</font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse16false0rr_ExpenseExampleNoRedemptionTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleNoRedemptionTransposedBlackrockTotalReturnFundPrime row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_PrimeMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleNoRedemptionTransposedBlackrockTotalReturnFundPrime row period compact * row primary compact * c olumn dei_DocumentInformationDocumentAxis compact cik000276463_PrimeMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>truehttp://www.blackrock.com/role/ScheduleExpenseExampleNoRedemptionTransposedBlackrockTotalReturnFundPrimefalsefalse001184 - Schedule - Expense Example, No Redemption {Transposed} - BlackRock Total Return Fund (Prime)truefalsefalse1falseColumnperiodPeriod*< /CommandIterator>ColumnprimaryElement*5false0rr_ExpenseExampleNoRedemptionYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue196196falsefalsefalsetruefalse2truefalsetrue174174falsefalsefalsetruefalse3truefalsetrue176176falsefalsefalsetruefalse4truefalsetrue214214falsefalsefalsetruefalse Monetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*6fals e0rr_ExpenseExampleNoRedemptionYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue606606falsefalsefalsetruefalse2truefalsetrue539539falsefalsefalsetruefalse3truefalsetrue545545falsefalsefalsetruefalse4truefalsetrue692692falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redee m your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$3falseColumnperiodPeriod*ColumnprimaryElement*7fa lse0rr_ExpenseExampleNoRedemptionYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue10421042falsefalsefalsetruefalse2truefalsetrue928928falsefalsefalsetruefalse3truefalsetrue939939falsefalsefalsetruefalse4truefalsetrue11961196falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subparagraph f -Subsection instructions falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$4falseColumnperiodPeriod*ColumnprimaryElement*8fa lse0rr_ExpenseExampleNoRedemptionYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue22542254falsefalsefalsetruefalse2truefalsetrue20192019falsefalsefalsetruefalse3truefalsetrue20412041falsefalsefalsetruefalse4truefalsetrue22462246falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subparagraph f -Subsection instructions falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$1falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_PrimeMemberRowdei_LegalEntityAxisAxiscik000276463_S00000407 1MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalsePrimedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_PrimeMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor B1 Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000037619Memberrr_ProspectusShareClassAxisexplicitMemberPrimeBlackRock Total Return FundInvestor B1 SharesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse 1truefalsetrue174174falsefalsefalsetruefalse2truefalsetrue539539falsefalsefalsetruefalse3truefalsetrue928928falsefalsefalsetruefalse4truefalsetrue20192019falsefalsefalsetruefalseOthernanafalsefalse2falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_PrimeMemberRowdei_LegalEntityAxisAxiscik000276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnitcik000276463_PrimeMemberRowdei_LegalEntityAxisAxiscik000276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalsePrimedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldi< DimensionInfo>cik000276463_PrimeMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor C1 Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011389Memberrr_ProspectusShareClassAxisexplicitMemberPrimeBlackRock Total Return FundInvestor C1 SharesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue196196falsefalsefalsetruefalse2truefalsetrue606606falsefalsefalsetruefalse3truefalsetrue10421042falsefalsefalsetruefalse4truefalsetrue22542254falsefalsefalsetruefalseOthernanafalsefalse4falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_PrimeMemberRowdei_LegalEntityAxisAxiscik000276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalsePrimedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_PrimeMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Fundd ei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor C2 Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000037621Memberrr_ProspectusShareClassAxisexplicitMemberPrimeBlackRock Total Return FundInvestor C2 SharesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421 700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue176176falsefalsefalsetruefalse2truefalsetrue545545falsefalsefalsetruefalse3truefalsetrue939939falsefalsefalsetruefalse4truefalsetrue20412041falsefalsefalsetruefalseOthernanafalsefalse44Expense Example, No Redemption - BlackRock Total Return Fund (Prime) Prime BlackRock Total Return Fund (USD $)UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*Rowdei_DocumentInformationDocumentAxisAxiscik000276463_PrimeMemberRowdei_LegalEntityAxis Axiscik000276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to ExpenseExampleNoRedemption.No authoritative reference available.falsefalse< /IsEPS>17false0rr_PortfolioTurnoverHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 11pt;" class="_mt"><b>Portfolio Turnover</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 5 -Subsection instructions falsefalse18false0rr_PortfolioTurnoverTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was&nbsp;<font class="_mt">1,754%</font> of the average value of its portfolio.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subsection example falsefalse19false0rr_StrategyHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Investment Strategies of the Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industr y or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse20false0rr_StrategyNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The Total Return Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font></font>Both U.S. and foreign companies and governments may issue these securities.&nbsp;<font class="_mt">Under normal circumstances, the Total Return Fund invests at least 80% of its assets in bonds and invests primarily in investment grade fixed-income securities.</font> The Total Return Fund may invest in fixed-income securities of any duration or maturity.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Total Return Fund will invest most of its assets in securities issued by U.S. issuers, but may also invest a portion of its assets in securities issued by foreign issuers. The Total Return Fund may also invest in derivative securities for hedging purposes or to increase the return on its investments. The Total Return Fund may also enter into dollar rolls.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Total Return Fund may invest up to 20% of its net assets in fixed-income securities that are rated below investment grade by at least one of the recognized rating agencies or in unrated securities of equivalent credit quality.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Total Return Fund is a "feeder" fund that invests all of its assets in a corresponding "master" portfolio, the Master Total Return Portfolio ("Master Portfolio"), a series of the Master Bond LLC ("Master LLC"), a mutual fund that has the same investment objectives and strategies as the Total Return Fund. All investments will be made at the level of the Master Portfolio. This structure is sometimes called a "master/feeder" structure. The Total Return Fund's investment results will correspond directly to the investment results of the underlying Master Portfolio in which it invests. For simplicity, this Prospectus uses the term "Total Return Fund" and "Fund" to include the Master Portfolio.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse21false0rr_RiskHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Risks of Investing in the Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNarrative Risk Disclosure.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subsection b falsefalse22false0rr_RiskNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time.&nbsp;<font class="_mt">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.</font> The following is a summary description of certain risks of investing in the Fund.</font></p> <ul> <li><font style="font-size: 10pt;" class="_mt"><b><i>Credit Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Credit risk refers to the possibility that the issuer of a security will not be able to make payments of interest and principal when due. Changes in an issuer's credit rating or the market's perception of an issuer's creditworthiness may also affect the value of the Fund's investment in that issuer.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Derivatives Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund's use of derivatives may reduce the Fund's returns and/or increase volatility. Volatility is defined as the characteristic of a security, an index or a market to fluctuate significantly in price within a short time period. Derivatives are also subject to counterparty risk, which is the risk that the other party in the transaction will not fulfill its contractual obligation. A risk of the Fund's use of derivatives is that the fluctuations in their values may not correlate perfectly with the overall securities markets. The possible lack of a liquid secondary market for derivatives and the resulting inability of the Fund to sell or otherwise close a derivatives position could expose the Fund to losses and could make derivatives more difficult for the Fund to value accurately. Derivatives may give rise to a form of lev erage and may expose the Fund to greater risk and increase its costs.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Dollar Rolls Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Dollar rolls involve the risk that the market value of the securities that the Fund is committed to buy may decline below the price of the securities the Fund has sold. These transactions may involve leverage.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Extension Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates rise, certain obligations will be paid off by the obligor more slowly than anticipated, causing the value of these securities to fall.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Foreign Securities Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include:<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Changes in foreign currency exchange rates can affect the value of the Fund's portfolio.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Settlement and clearance procedures in certain foreign markets may result in delays in payment for or delivery of securities not typically associated with settlement and clearance of U.S. investments.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>High Portfolio Turnover Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund may engage in active and frequent trading of its portfolio securities. High portfolio turnover (more than 100%) may result in increased transaction costs to the Fund, including brokerage commissions, dealer mark-ups and other transaction costs on the sale of the securities and on reinvestment in other securities. The sale of Fund portfolio securities may result in the realization and/or distribution to shareholders of higher capital gains or losses as compared to a fund with less active trading policies. Given the frequency of sales, such gain or loss will likely be short-term capital gain or loss and, in the event of a gain, would increase an investor's tax liability unless shares are held through a tax-deferred or exempt vehicle. These effects of higher than normal portfolio turnover may adversely aff ect Fund performance. In addition, investment in mortgage dollar rolls and participation in TBA transactions may significantly increase the Fund's portfolio turnover rate. A TBA transaction is a method of trading mortgage-backed securities where the buyer and seller agree upon general trade parameters such as agency, settlement date, par amount, and price.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Interest Rate Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Interest rate risk is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall, and decrease as interest rates rise.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Junk Bonds Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Although junk bonds generally pay higher rates of interest than investment grade bonds, junk bonds are high risk investments that may cause income and principal losses for the Fund.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Market Risk and Selection Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Mortgage- and Asset-Backed Securities Risks</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Mortgage- and asset-backed securities represent interests in "pools" of mortgages or other assets, including consumer loans or receivables held in trust. Mortgage- and asset-backed securities are subject to credit, interest rate, prepayment and extension risks. These securities also are subject to risk of default on the underlying mortgage or asset, particularly during periods of economic downturn. Small movements in interest rates (both increases and decreases) may quickly and significantly reduce the value of certain mortgage-backed securities.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Prepayment Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates fall, certain obligations will be paid off by the obligor more quickly than originally anticipated, and the Fund may have to invest the proceeds in securities with lower yields.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Sovereign Debt Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Sovereign debt instruments are subject to the risk that a governmental entity may delay or refuse to pay interest or repay principal on its sovereign debt, due, for example, to cash flow problems, insufficient foreign currency reserves, political considerations, the relative size of the governmental entity's debt position in relation to the economy or the failure to put in place economic reforms required by the International Monetary Fund or other multilateral agencies.<br /><br /></font></li></ul></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringNarrative Risk Disclosure. A Fund may, in responding to this Item, describe the types of investors for whom the Fund is intended or the types of investment goals that may be consistent with an investment in the Fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph i -Clause instruction -Subsection b falsefalse23false0rr_BarChartAndPerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><i><strong>Performance Information</strong></i></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse24false0rr_PerformanceNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsef alse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font></font>The table compares the Fund's performance to that of the Barclays Capital U.S. Aggregate Bond Index. Effective September 24, 2007, the Total Return Fund reorganized with BlackRock Total Return Portfolio (the "Predecessor Fund"), a series of BlackRock Funds II (the "Reorganization"), and the Predecessor Fund's performance and financial history has been adopted by the Total Return Fund and will be used going forward from the date of the Reorganization. The information below is based on the performance information of the combined fund resulting from the Reorganization and that of the Predecessor Fund prior to the Reorganization (adjusted as necessary to reflect the fees applicable to each class of shar es). Prior to September 24, 2007, Investor A1, Investor B1, Investor C1 and Investor C2 Share performance results are those of BlackRock Shares of the Predecessor Fund restated to reflect Investor A1, Investor B1, Investor C1 and Investor C2 fees, respectively. Prior to September 24, 2007, Investor B2 Share performance results are those of Investor B Shares of the Predecessor Fund with no adjustments.&nbsp;<font class="_mt">As with all such investments, past performance (before and after taxes) is not an indication of future results.</font>&nbsp;<font class="_mt"><font class="_mt">Sales charges are not reflected in the bar chart.</font> If they were, returns would be less than those shown.</font>&nbsp;<font class="_mt">However, the table includes all applicable fees and sales charges.</font> If the Fund's investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund's returns would have been lower. Updated information on the Fund's performance can be obtained by visiting&nbsp;<font class="_mt">http://www.blackrock.com/funds</font> or can be obtained by phone at <font class="_mt"><font style="font-size: 10pt;" class="_mt">800-882-0052.</font></font></font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse25false0rr_BarChartHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="center"><font style="font-size: 11pt;" class="_mt"><b>Investor C1 Shares<br />ANNUAL TOTAL RETURNS<br />BlackRock Total Return Fund<br />As of 12/31</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse26false0rr_BarChartTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualTotalReturnsBarChartBlackrockTotalReturnFundPrime column period compact * column primary compact * row dei_DocumentInformationDocumentAxis compact cik000276463_PrimeMember row dei_LegalEntityAxis compact cik000276463_S000004071Member row rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsefalseBarChart6.jpg<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualTotalReturnsBarChartBlackrockTotalReturnFundPrime column period compact * column primary compact * row dei_DocumentInformationDocumentAx is compact cik000276463_PrimeMember row dei_LegalEntityAxis compact cik000276463_S000004071Member row rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsehttp://www.blackrock.com/role/ScheduleAnnualTotalReturnsBarChartBlackrockTotalReturnFundPrimefalsefalse001192 - Schedule - Annual Total Returns (Bar Chart) - BlackRock Total Return Fund (Prime)truefalsefalse1falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*6false0rr_AnnualReturn2002rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse< /IsReverseSign>1truetruefalse0.07970.0797falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*7false0rr_AnnualReturn2003rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.03670.0367falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. T he Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$3falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*8false0rr_AnnualReturn2004rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.03490.0349falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. T he Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$4falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*9false0rr_AnnualReturn2005rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.01520.0152falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. T he Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$5falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*10false0rr_AnnualReturn2006rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.03220.0322falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$6falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*11false0rr_AnnualReturn2007rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.0420.042falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. Th e Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$7falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*12false0rr_AnnualReturn2008rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.1204-0.1204falsefalsefalsetruefalse< /hasScenarios>Otherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes . The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$8falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*13false0rr_AnnualReturn2009rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.15170.1517falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$9falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*14false0rr_AnnualReturn2010rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.09110.0911falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$1falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_PrimeMemberRowdei_LegalEntityAxisAxiscik000276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*falsefalsePrimedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_PrimeMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor C1 Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011389 Memberrr_ProspectusShareClassAxisexplicitMemberPrimeBlackRock Total Return FundInvestor C1 Shares0truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.07970.0797falsefalsefalsetruefalse2truetruefalse0.03670.0367falsefalsefalsetruefalse3truetruefalse0.03490.0349falsefalsefalsetruefalse4truetruefalse0.01520.0152falsefalsefalsetruefalse5truetruefalse 0.03220.0322falsefalsefalsetruefalse6truetruefalse0.0420.042falsefalsefalsetruefalse7truetruefalse-0.1204-0.1204falsefalsefalsetruefalse8truetruefalse0.15170.1517falsefalsefalsetruefalse9truetruefalse0.09110.0911falsefalsefalsetruefalseOthernanafalsefalse91Annual Total Returns (Bar Chart) - BlackRock Total Return Fund (Prime) UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*Rowdei_DocumentInformationDocumentAxisAxiscik000276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to BarChartData.No authoritative reference available.falsefalse27false0rr_BarChartClosingTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">During the period shown in the bar chart, the&nbsp;<font class="_mt">highest return</font> for a quarter was&nbsp;<font class="_mt">6.86%</font> (quarter ended September 30, 2009) and the&nbsp;<font class="_mt">lowest return</font> for a quarter was&nbsp;<font class="_mt">-7.03%</font> (quarter ended September 30, 2008).</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse28false0rr_PerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"><strong><font class="_mt"><font size="2" class="_mt">As of 12/31/10<br /></font><font style="font-size: 9pt;" class="_mt">Average Annual Total Returns</font></font></strong> </div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringThis item represents Average Anuual Total Returns. 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class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes.&nbsp;</font></font><font class="_mt">Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or IRAs.</font> <font class="_mt">After-tax returns are shown for Investor C1 Shares only, and the after-tax returns for Investor A1, Investor B1, Investor B2 and Investor C2 Shares will vary.</font></font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIf the Fund has annual returns for at least one calendar year, provide a table showing the Fund's (A) average annual total return; (B) average annual total return (after taxes on distributions); and (C) average annual total return (after taxes on distributions and redemption). A Money Market Fund should show only the returns described in clause (A) of the preceding sentence. All returns should be shown for 1-, 5-, and 10- calendar year periods ending on the date of the most recently completed calendar year (or for the life of the Fund, if shorter), but only for periods subsequent to the effective date of the Fund's registration statement. The table also shouldshow the return s of an appropriate broadbased securities market index as defined in Instruction 5 to Item 22(b)(7) for the same periods. A Fund that has been in existence for more than 10 years also may include returns for the life of the Fund. A Money Market Fund may provide the Fund's 7-day yield ending on the date of the most recent calendar year or disclose a toll-free (or collect) telephone number that investors can use to obtain the Fund's current 7-day yield. For a Fund (other than a Money Market Fund or a Fund described in General Instruction C.3.(d)(iii)), provide the information in the following table with the specified captions AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, _____). For a Fund that provides annual total returns for only one calendar year or for a Fund that does not include the bar chart because it does not have annual returns for a full calendar year, modify, as appropriate, the narrative explanation required by paragraph (c)(2)(i) (e.g., by stating that the information gives so me indication of the risks of an investment in the Fund by comparing the Fund's performance with a broad measure of market performance).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iv -Subsection b falsefalse129Risk/Return Summary - BlackRock Total Return Fund (Prime) (Prime, BlackRock Total Return Fund)UnKnownUnKnownUnKnownUnKnownfalsetrue XML 16 R15.xml IDEA: Risk/Return Summary - BlackRock Total Return Fund (Inv Ins) 2.2.0.25truefalse001146 - Document - Risk/Return Summary {Unlabeled} - BlackRock Total Return Fund (Inv Ins)falsefalsetrue1falsefalseUSDtruefalse{dei_DocumentInformationDocumentAxis} : Inv Ins Member {dei_LegalEntityAxis} : S000004071 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_20113http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalsecik000276463_InvInsMemberdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalsecik000276463_S000004071Memberdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://www.blackrock.com/role/documentriskreturnsummaryunlabeledblackrocktotalreturnfundinvins1falsefalsefalse00Inv Ins | BlackRock Total Return FundInv Ins | BlackRock Total Return Fundfalsefalsefalsefalsefalse1falsefalseUSDtruefalse{dei_DocumentInformationDocumentAxis} : Inv Ins Member {dei_LegalEntityAxis} : S000004071 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_20113http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalsecik000276463_InvInsMemberdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalsecik000276463_S000004071Memberdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse3false0rr_RiskReturnHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00< div class="MetaData"> <p align="left"><font style="font-size: 14pt;" class="_mt"><b><i>Key Facts about BlackRock Total Return Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Investment Objectives/Goals Include the following information, in plain English under rule 421(d) under the Securities Act, in the order and subject matter indicatedReference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 falsefalse4false0rr_ObjectiveHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div><font class="_mt"> </font> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Investment Objective</i></b></font></p><font class="_mt"> </font></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse5false0rr_ObjectivePrimaryTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The investment objective of the BlackRock Total Return Fund (the "Total Return Fund" or the "Fund") is to realize a total return that exceeds that of the Barclays Capital U.S. Aggregate Bond Index.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. 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Shareholder Fees (fees paid directly from your investment) 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 you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be You would pay the following expenses if you did not redeem your shares The Example does not reflect sales charges (loads) on reinvested dividends [and other distributions]. If these sales charges (loads) were included, your costs would be higher. Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its po rtfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was __% of the average value of its whole portfolio. Instructions. A.3.instructions.6 New Funds. For purposes of this Item, a "New Fund" is a Fund that does not include in Form N-1A financial statements reporting operating results or that includes financial statements for the Fund's initial fiscal year reporting operating results for a period of 6 months or less. The following Instructions apply to New Funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph d -Subsection instructions falsefalse7false0rr_ExpenseNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.&nbsp;<font class="_mt">You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least <font class="_mt">$25,000 </font>in the BlackRock-advised fund complex.</font> More information about these and other discounts is available from your financial professional and in the "Details about the Share Classes" section on page 27 of the Fund's prospectus and in the "Purchase of Shares" section on page II-67 of the Fund's statement of additional information.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThis table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $[_____] in [name of fund family] funds. Include the narrative explanations in the order indicated. A Fund may modify the narrative explanations if the explanation contains comparable information to that shown.The narrative explanation regarding sales charge discounts is only required by a Fund that offers such discounts and should specify the minimum level of investment required to qualify for a discount. Modify the narrative explanation to state that Fund shares are sold on a national securities exchange at the end of the time periods indicated, and that brokerage commi ssions for buying and selling Fund shares through a broker are not reflected.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph b -Subsection instructions falsefalse8false0rr_ShareholderFeesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <p style="line-height: normal; margin: 0in 0in 0pt; font-family: 'Calibri','sans-serif'; font-size: 11pt;" class="MsoNormal"><b><font style="font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">Shareholder Fees <br />(fees paid directly from your investment)</font></b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringShareholder Fees (fees paid directly from your investment).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter 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A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. 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A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalse0rr_MaximumDeferredSalesChargeOverOfferingPricetruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00[1]falsefalsefalsetruefalse2truetruetrue0.040.04[2]falsefalsefalsetruefalse3truetruetrue0.010.01[3]falsefalsefalsetruefalse4truetruetrue00falsefalsefalsetruefalse5truetruetrue00falsefalsefalsetruefalseOthernanafalsefalse1A CDSC of 0.75% is assessed on certain redemptions of Investor A Shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase of an investment of $1,000,000 or more.2The CDSC is 4.00% if shares are redeemed within two years. The CDSC for Investor B Shares decreases for redemptions made in subsequent years. 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Crr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000037620Memberrr_ProspectusShareClassAxisexplicitMemberInv InsBlackRock Total R eturn FundInvestor CUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$4falseColumnperiodPeriod*Columndei_DocumentInformationDocumentAxisAxiscik000276463_InvInsMemberColumndei_LegalEntityAxisAxiscik000276463_S000004071MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*duration2011- 01-28T00:00:002011-01-28T00:00:00falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefa lseInstitutionalrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011390Memberrr_ProspectusShareClassAxisexplicitMemberInv InsBlackRock Total Return FundInstitutionalUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso4217< MeasureValue />0falseUSDfalsefalse$5falseColumnperiodPeriod*Columndei_DocumentInformationDocumentAxisAxiscik000276463_InvInsMemberColumndei_LegalEntityAxisAxiscik000276463_S000004071MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefal seBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Rrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011391Memberrr_ProspectusShareClassAxisexplicitMemberInv InsBlackRock Total Return FundClass RUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$1falseRowprimaryElement*5false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00440.0044[1],[2]falsefalsefalsetruefalse2truetruetrue0.00440.0044[1],[2]falsefalsefalsetruefalse3truetruetrue0.00440.0044[1],[2]falsefalsefalsetruefalse4truetruetrue0.00440.0044[1],[2]falsefalsefalsetruefalse5truetruetrue0.00440.0044[1],[2]falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse0rr_ManagementFeesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[1][2]1truetruetrue0.00440.0044< NonNumbericText />falsefalsefalsetruefalse2truetruetrue0.00440.0044falsefalsefalsetruefalse3truetruetrue0.00440.0044falsefalsefalsetruefalse4truetruetrue0.00440.0044falsefalsefalsetruefalse5truetruetrue0.00440.0044falsefalsefalsetruefalseOthernanafalsefalse2falseRowprimaryElement*6false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00250.0025[2]falsefalsefalsetruefalse2truetruetrue0.00750.0075[2]falsefalsefalsetruefalse3truetruetrue00[2]falsefalsefalsetruefalse4truetruetrue0.0050.005[2]falsefalsefalsetruefalse5truetruetrue0.010.01[2]falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalse0rr_DistributionAndService12b1FeesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[2]1truetruetrue0.00250.0025falsefalsefalsetruefalse2truetruetrue0.00750.0075falsefalsefalsetruefalse3truetruetrue0.010.01falsefalsefalsetruefalse4truetruetrue00falsefalsefalsetruefalse5truetruetrue0.0050.005falsefalsefalsetruefalseOthernanafalsefalse3falseRowprimaryElement*7false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truetruetrue0.00730.0073[2]false falsefalsetruefalse2truetruetrue0.00890.0089[2]falsefalsefalsetruefalse3truetruetrue0.0070.007[2]falsefalsefalsetruefalse4truetruetrue0.00840.0084[2]falsefalsefalsetruefalse5truetruetrue0.0080.008[2]falsefalsefalsetruefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions truefalse0rr_OtherExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[2]1truetruetrue0.00730.0073falsefalsefalsetruefalse2truetruetrue0.00890.0089falsefalsefalsetruefalse3truetruetrue0.0080.008< NonNumbericText />falsefalsefalsetruefalse4truetruetrue0.0070.007falsefalsefalsetruefalse5truetruetrue0.00840.0084falsefalsefalsetruefalseOthernanafalsefalse4falseRowprimaryElement*8false0rr_Component1OtherExpensesOverAssetsrrfals enadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00460.0046[2]falsefalsefalsetruefalse2truetruetrue0.00460.0046[2]falsefalsefalsetruefalse3truetruetrue0.00460.0046[2]falsefalsefalsetruefalse4truetruetrue0.00460.0046[2]falsefalsefalsetruefalse5truetruetrue0.00460.0046[2]falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse0rr_Component1OtherExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[2]1truetruetrue0.00460.0046falsefalsefalsetruefalse2truetruetrue0.00460.0046falsefalsefalsetruefalse3truetruetrue0.00460.0046falsefalsefalsetruefalse4truetruetrue0.00460.0046falsefalsefalsetruefalse5truetruetrue0.00460.0046falsefalsefalsetruefalseOthernanafalsefalse5falseRowprimaryElement*9false0rr_Component2OtherExpensesOverAssetsrr falsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00270.0027[2]falsefalsefalsetruefalse2truetruetrue0.00430.0043[2]falsefalsefalsetruefalse3truetruetrue0.00240.0024[2]falsefalsefalsetruefalse4truetruetrue0.00380.0038[2]falsefalsefalsetruefalse5truetruetrue0.00340.0034[2]falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 10 -Subsection table falsefalse0rr_Component2OtherExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[2]1truetruetrue0.00270.0027falsefalsefalsetruefalse2truetruetrue0.00430.0043falsefalsefalsetruefalse3truetruetrue0.00340.0 034falsefalsefalsetruefalse4truetruetrue0.00240.0024falsefalsefalsetruefalse5truetruetrue0.00380.0038falsefalsefalsetruefalseOthernanafalsefalse6falseRowprimaryElement*11false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truetruetrue0.01420.0142[2]falsefalsefalsetruefalse2truetruetrue0.02080.0208[2]falsefalsefalsetruefalse3truetruetrue0.01140.0114[2]falsefalsefalsetruefalse4truetruetrue0.01780.0178[2]falsefalsefalsetruefalse5truetruetrue0.02240.0224[2]falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions truefalse0rr_ExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[2]1truetruetrue0.01420.0142falsefalsefalsetruefalse2truetruetrue0.02080.0208falsefalsefalsetruefalse3truetruetrue0.02240.0224falsefalsefalsetruefalse4truetruetrue0.01140.0114falsefalsefalsetruefalse5truetruetrue0.01780.01 78falsefalsefalsetruefalseOthernanafalsefalse7falseRowprimaryElement*12false0rr_FeeWaiverOrReimbursementOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue-0.0007-0.0007[1],[2]falsefalsefalsetruefalse2truetruetrue-0.0007-0.0007[1],[2]falsefalsefalsetruefalse3truetruetrue-0.0013-0.0013[1],[2]falsefalsefalsetruefalse4truetruetrue-0.0022-0.0022[1],[2]falsefalsefalsetruefalse5truetruetrue-0.0013-0.0013[1],[2]falsefalsefalsetruefalseOtherrr:NonPositivePure4TypepureTotal Annual Fund Operating Expenses. If there were expense reimbursement or fee waiver arrangements that reduced any Fund operating expenses and will continue to reduce them for no less than one year from the effective date of the Fund's registration statement, a Fund may add two captions to the table one caption showing the amount of the expense reimbursement or fee waiver, and a second caption showing the Fund's net expenses after subtracting the fee reimbursement or expense waiver from the total fund operating expenses. The Fund should place these additional captions directly below the "Total Annual Fund Operating Expenses" caption of the table and should use appropriate descriptive captions, such as "Fee Waiver [and/or Expense Reimbursement]" and "Total Annual Fund Operating Expenses After Fee Waiver [and/or Expense Reimbursement]," respectively. If the Fund provides this disclosure, also disclose the period for which the expense reimbursement or fee waiver arrangement is expected to continue, and briefly describe who can terminate the arrangement and under what circumstances.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse0rr_FeeWaiverOrReimbursementOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[1][2]1truetruetrue-0.0007-0.0007falsefalsefalsetruefalse2truetruetrue-0.0007-0.0007falsefalsefalsetruefalse3truetruetrue-0.0013-0.0013falsefalsefalsetruefalse4truetruetrue-0.0013-0.0013falsefalsefalsetruefalse5truetruetrue-0.0022-0.0022falsefalsefalsetruefalseOthernanafalsefalse8falseRowprimaryElement*13false0rr_NetExpensesOver AssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truetruetrue0.01350.0135[2]falsefalsefalsetruefalse2truetruetrue0.02010.0201[2]falsefalsefalsetruefalse3truetruetrue0.01010.0101[2]falsefalsefalsetruefalse4truetruetrue0.01560.0156[2]falsefalsefalsetruefalse5truetruetrue0.02110.0211[2]falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table truefalse0rr_NetExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[2]1truetruetrue0.01350.0135falsefalsefalsetruefalse2truetruetrue0.02010.0201falsefalsefalsetruefalse3truetruetrue0.02 110.0211falsefalsefalsetruefalse4truetruetrue0.01010.0101falsefalsefalsetruefalse5truetruetrue0.01560.0156falsefalsefalsetruefalseOthernanafalsefalse1As described in the "Management of the Funds" section of the Fund's prospectus on page 44, BlackRock has contractually agreed to waive the Total Return Fund's management fee in the amount of the Total Return Fund's share of the management fee paid by the Master Portfolio for as long as the Total Return Fund invests in the Master Portfolio. In addition, BlackRock has contractually agreed to waive and/or reimburse fees or expenses in order to limit Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements (excluding Dividend Expense, Interest Expense, Acquired Fund Fees and Expenses and certain other Fund expenses) to 0.90% (for Investor A Shares), 1.65% (for Investor C Shares), 0.55% (for Institutional Shares) and 1.10% (for Class R Shares) of average daily net assets until February 1, 2012. These contractual agreements may be terminated upon 90 days' notice by a majority of the non-interested directors of the Fund or by a vote of a majority of the outstanding voting securities of the Fund.2The fees and expenses shown in the table and the example that follows include both the expenses of Total Return Fund and Total Return Fund's share of the allocated expenses of Master Total Return Portfolio (the "Master Portfoli o").58Annual Fund Operating Expenses - BlackRock Total Return Fund (Inv Ins) Inv Ins BlackRock Total Return FundUnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*Columndei_DocumentInformationDocumentAxisAxiscik000276463_InvInsMemberColumndei_LegalEntityAxisAxiscik000276463_S000004071MemberColumnrr_Pr ospectusShareClassAxisAxis*ColumnunitUnit*RowprimaryElement*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to OperatingExpensesData.No authoritative reference available.falsefalse12false0rr_ExpenseExampleHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<font style="font-size: 11pt;" class="_mt"><strong>Example:</strong></font>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringHeading for Expense Example.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse13false0rr_ExpenseExampleNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">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:</font></p></div> </div>falsefalsefalsefalsefalseOtherus-t ypes:textBlockItemTypestringThe Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection example falsefalse14false0rr_ExpenseExampleWithRedemptionTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockTotalReturnFundInvIns row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_InvInsMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockTotalReturnFundInvIns row period compact * row primary compact * column dei_DocumentInformationDocumen tAxis compact cik000276463_InvInsMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>truehttp://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockTotalReturnFundInvInsfalsefalse001170 - Schedule - Expense Example {Transposed} - BlackRock Total Return Fund (Inv Ins)truefalsefalse1falseColumnperiodPeriod*ColumnprimaryElement*5false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalse< /IsRatio>true532532falsefalsefalsetruefalse2truefalsetrue604604falsefalsefalsetruefalse3truefalsetrue103103falsefalsefalsetruefalse4truefalsetrue159159falsefalsefalsetruefalse5truefalsetrue314314falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*6fals e0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue811811falsefalsefalsetruefalse2truefalsetrue930930falsefalsefalsetruefalse3truefalsetrue334334falsefalsefalsetruefalse4truefalsetrue524524falsefalsefalsetruefalse5truefalsetrue673673falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$3falseColumnperiodPeriod*ColumnprimaryElement*7fa lse0rr_ExpenseExampleYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue11101110falsefalsefalsetruefalse2truefalsetrue12831283falsefalsefalsetruefalse3truefalsetrue584584falsefalsefalsetruefalse4truefalsetrue914914falsefalsefalsetruefalse5truefalsetrue11591159falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$4falseColumnperiodPeriod*ColumnprimaryElement*8fa lse0rr_ExpenseExampleYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue19591959falsefalsefalsetruefalse2truefalsetrue23382338falsefalsefalsetruefalse3truefalsetrue13001300falsefalsefalsetruefalse4truefalsetrue20072007falsefalsefalsetruefalse5truefalsetrue24492449falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$1falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_InvInsMemberRowdei_LegalEntityAxisAxiscik000276463_S0000040 71MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor Arr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011387Memberrr_ProspectusShareClassAxisexplicitMemberInv InsBlackRock Total Return FundInvestor AUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso4217 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Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*6fals e0rr_ExpenseExampleNoRedemptionYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue630630falsefalsefalsetruefalse2truefalsetrue673673falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not re deem your shares. 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Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 5 -Subsection instructions falsefalse18false0rr_PortfolioTurnoverTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was&nbsp;<font class="_mt">1,754%</font> of the average value of its portfolio.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subsection example falsefalse19false0rr_StrategyHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><strong><em>Principal Investment Strategies of the Fund</em></strong></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a partic ular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse20false0rr_StrategyNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The Total Return Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font></font></font></font></font></font>Both U.S. and foreign companies and governments may issue these securities.&nbsp;<font class="_mt">Under normal circumstances, the Total Return Fund invests at least 80% of its assets in bonds and invests primarily in investment grade fixed-income securities.</font> The Total Return Fund may invest in fixed-income securities of any duration or maturity.& lt;/font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Total Return Fund will invest most of its assets in securities issued by U.S. issuers, but may also invest a portion of its assets in securities issued by foreign issuers. The Total Return Fund may also invest in derivative securities for hedging purposes or to increase the return on its investments. The Total Return Fund may also enter into dollar rolls.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Total Return Fund may invest up to 20% of its net assets in fixed-income securities that are rated below investment grade by at least one of the recognized rating agencies or in unrated securities of equivalent credit quality.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Total Return Fund is a "feeder" fund that invests all of its assets in a corresponding "master" portfolio, the Master Total Return Portfolio ("Master Portfolio"), a series of the Master Bond LLC ("Master LLC"), a mutual fund that has the same investment objectives and strategies as the Total Return Fund. All investments will be made at the level of the Master Portfolio. This structure is sometimes called a "master/feeder" structure. The Total Return Fund's investment results will correspond directly to the investment results of the underlying Master Portfolio in which it invests. For simplicity, this Prospectus uses the term "Total Return Fund" and "Fund" to include the Master Portfolio.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse21false0rr_RiskHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Risks of Investing in the Fund</i></b><br /><br /></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNarrative Risk Disclosure.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subsection b falsefalse22false0rr_RiskNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time.&nbsp;<font class="_mt">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.</font> The following is a summary description of certain risks of investing in the Fund.<br /><br /></font></p> <ul> <li><font style="font-size: 10pt;" class="_mt"><b><i>Credit Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Credit risk refers to the possibility that the issuer of a security will not be able to make payments of interest and principal when due. Changes in an issuer's credit rating or the market's perception of an issuer's creditworthiness may also affect the value of the Fund's investment in that issuer.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Derivatives Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund's use of derivatives may reduce the Fund's returns and/or increase volatility. Volatility is defined as the characteristic of a security, an index or a market to fluctuate significantly in price within a short time period. Derivatives are also subject to counterparty risk, which is the risk that the other party in the transaction will not fulfill its contractual obligation. A risk of the Fund's use of derivatives is that the fluctuations in their values may not correlate perfectly with the overall securities markets. The possible lack of a liquid secondary market for derivatives and the resulting inability of the Fund to sell or otherwise close a derivatives position could expose the Fund to losses and could make derivatives more difficult for the Fund to value accurately. Derivatives may give rise to a form of lev erage and may expose the Fund to greater risk and increase its costs.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Dollar Rolls Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Dollar rolls involve the risk that the market value of the securities that the Fund is committed to buy may decline below the price of the securities the Fund has sold. These transactions may involve leverage.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Extension Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates rise, certain obligations will be paid off by the obligor more slowly than anticipated, causing the value of these securities to fall.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Foreign Securities Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include:<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Changes in foreign currency exchange rates can affect the value of the Fund's portfolio.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Settlement and clearance procedures in certain foreign markets may result in delays in payment for or delivery of securities not typically associated with settlement and clearance of U.S. investments.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>High Portfolio Turnover Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund may engage in active and frequent trading of its portfolio securities. High portfolio turnover (more than 100%) may result in increased transaction costs to the Fund, including brokerage commissions, dealer mark-ups and other transaction costs on the sale of the securities and on reinvestment in other securities. The sale of Fund portfolio securities may result in the realization and/or distribution to shareholders of higher capital gains or losses as compared to a fund with less active trading policies. Given the frequency of sales, such gain or loss will likely be short-term capital gain or loss and, in the event of a gain, would increase an investor's tax liability unless shares are held through a tax-deferred or exempt vehicle. These effects of higher than normal portfolio turnover may adversely aff ect Fund performance. In addition, investment in mortgage dollar rolls and participation in TBA transactions may significantly increase the Fund's portfolio turnover rate. A TBA transaction is a method of trading mortgage-backed securities where the buyer and seller agree upon general trade parameters such as agency, settlement date, par amount, and price.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Interest Rate Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Interest rate risk is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall, and decrease as interest rates rise.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Junk Bonds Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Although junk bonds generally pay higher rates of interest than investment grade bonds, junk bonds are high risk investments that may cause income and principal losses for the Fund.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Market Risk and Selection Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Mortgage- and Asset-Backed Securities Risks</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Mortgage- and asset-backed securities represent interests in "pools" of mortgages or other assets, including consumer loans or receivables held in trust. Mortgage- and <font style="font-size: 10pt;" class="_mt">asset-backed securities are subject to credit, interest rate, prepayment and extension risks. These securities also are subject to risk of default on the underlying mortgage or asset, particularly during periods of economic downturn. Small movements in interest rates (both increases and decreases) may quickly and significantly reduce the value of certain mortgage-backed securities.<br /><br /></font></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Prepayment Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates fall, certain obligations will be paid off by the obligor more quickly than originally anticipated, and the Fund may have to invest the proceeds in securities with lower yields.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Sovereign Debt Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Sovereign debt instruments are subject to the risk that a governmental entity may delay or refuse to pay interest or repay principal on its sovereign debt, due, for example, to cash flow problems, insufficient foreign currency reserves, political considerations, the relative size of the governmental entity's debt position in relation to the economy or the failure to put in place economic reforms required by the International Monetary Fund or other multilateral agencies.<br /><br /></font></li></ul></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringNarrative Risk Disclosure. A Fund may, in responding to this Item, describe the types of investors for whom the Fund is intended or the types of investment goals that may be consistent with an investment in the Fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph i -Clause instruction -Subsection b falsefalse23false0rr_BarChartAndPerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 12pt;" class="_mt"><strong><em>Performance Information</em></strong> </font></font></font></font></font></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse24false0rr_PerformanceNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsef alse00<div> <div class="MetaData"><font style="font-size: 12pt;" class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 12pt;" class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font></font></font></font></font>The table compares the Fund's performance to that of the Barclays Capital U.S. Aggregate Bond Index. Effective September 24, 2007, the Total Return Fund reorganized with BlackRock Total Return Portfolio (the "Predecessor Fund"), a series of BlackRock Funds II (the "Reorganization"), and the Predecessor Fund's performance and financial history has been adopted by the Total Return Fund and will be used going forward from the date of the Reorganization. The information below is based on the performance information of the combined fund resulting from the Reorganization and that of the Predecessor Fund prior to the Reorganization (adjusted as necessary to reflect the fees applicable to each class of shares). Prior to September 24, 2007, Investor A, Investor B and Institutional Share performance results are those of BlackRock Shares of the Predecessor Fund restated to reflect Investor A, Investor B and Institutional Share fees, respectively. Prior to September 24, 2007, Investor C Share performance results are those of Investor C Shares of a predecessor fund with no adjustments. Prior to October 2, 2006, Class R Share performance results are those of the Class R Shares of the Predecessor Fund. Prior to the Predecessor Fund Class R Shares inception date, the Class R Share performance is based on the performance of the BlackRock Shares of the Predecessor Fund restated t o reflect Class R Share fees.&nbsp;<font class="_mt">As with all such investments, past performance (before and after taxes) is not an indication of future results.</font>&nbsp;<font class="_mt">Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.</font>&nbsp;<font class="_mt">However, the table includes all applicable fees and sales charges.</font> If the Fund's investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund's returns would have been lower. Updated information on the Fund's performance can be obtained by visiting&nbsp;<font class="_mt">http://www.blackrock.com/funds</font> or can be obtained by phone at <font class="_mt"><font style="font-size: 10pt;" class="_mt">800-882-0052.</font></font></font> </font> <p>&nbsp;</p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse25false0rr_BarChartHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="center"><font style="font-size: 11pt;" class="_mt"><b>Investor A Shares<br />ANNUAL TOTAL RETURNS<br />BlackRock Total Return Fund<br />As of 12/31</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse26false0rr_BarChartTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualTotalReturnsBarChartBlackrockTotalReturnFundInvIns column period compact * column primary compact * row dei_DocumentInformationDocumentAxis compact cik000276463_InvInsMember row dei_LegalEntityAxis compact cik000276463_S000004071Member row rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsefalseBarChart3.jpg<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualTotalReturnsBarChartBlackrockTotalReturnFundInvIns column period compact * column primary compact * row dei_DocumentInformationDocumen tAxis compact cik000276463_InvInsMember row dei_LegalEntityAxis compact cik000276463_S000004071Member row rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsehttp://www.blackrock.com/role/ScheduleAnnualTotalReturnsBarChartBlackrockTotalReturnFundInvInsfalsefalse001186 - Schedule - Annual Total Returns (Bar Chart) - BlackRock Total Return Fund (Inv Ins)truefalsefalse1falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*6false0rr_AnnualReturn2002rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.08570.0857falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*7false0rr_AnnualReturn2003rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.04240.0424falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. T he Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$3falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*8false0rr_AnnualReturn2004rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.04060.0406falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. T he Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$4falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*9false0rr_AnnualReturn2005rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.02070.0207falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. T he Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$5falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*10false0rr_AnnualReturn2006rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.03790.0379falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$6falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*11false0rr_AnnualReturn2007rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.04770.0477falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$7falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*12false0rr_AnnualReturn2008rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.1152-0.1152falsefalsefalsetruefalse< /hasScenarios>Otherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes . The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$8falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*13false0rr_AnnualReturn2009rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.15840.1584falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$9falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*14false0rr_AnnualReturn2010rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.0970.097falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. Th e Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$1falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_InvInsMemberRowdei_LegalEntityAxisAxiscik000276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor Arr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011387Memb errr_ProspectusShareClassAxisexplicitMemberInv InsBlackRock Total Return FundInvestor A0truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.08570.0857falsefalsefalsetruefalse2truetruefalse0.04240.0424falsefalsefalsetruefalse3truetruefalse0.04060.0406falsefalsefalsetruefalse4truetruefalse0.02070.0207falsefalsefalsetruefalse5truetruefalse0.03790.0379falsefalsefalsetruefalse6truetruefalse0.04770.0477falsefalsefalsetruefalse7truetruefalse- 0.1152-0.1152falsefalsefalsetruefalse8truetruefalse0.15840.1584falsefalsefalsetruefalse9truetruefalse0.0970.097falsefalsefalsetruefalseOthernanafalsefalse91Annual Total Returns (Bar Chart) - BlackRock Total Return Fund (Inv Ins) UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*Rowdei_DocumentInformationDocumentAxisAxiscik000276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to BarChartData.No authoritative reference available.falsefalse27false0rr_BarChartClosingTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">During the period shown in the bar chart, the&nbsp;<font class="_mt">highest return</font> for a quarter was&nbsp;<font class="_mt">7.12%</font> (quarter ended September 30, 2009) and the <font class="_mt">lowest return </font>for a quarter was&nbsp;<font class="_mt">-6.97%</font> (quarter ended September 30, 2008).</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse28false0rr_PerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><b><font style="font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">As of 12/31/10<br />Average Annual Total Returns</font></b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringThis item represents Average Anuual Total Returns. If a Multiple Class Fund offers a Class in the prospectus that converts into another Class after a stated period, compute average annual total returns in the table by using the returns of the other Class for the period after conversion.< /ElementDefenition>Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit c -Subsection b falsefalse29false0rr_PerformanceTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAverageAnnualTotalReturnsTransposedBlackrockTotalReturnFundInvIns row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_InvInsMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * column rr_PerformanceMeasureAxis compact * ~&lt;/div&gt; 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available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse002001-12-07falsefalsetruetruefalse2falsetruefalse002001-12-07falsefalsetruetruefalse3falsetruefalse002001-12-07falsefalsetruetruefalse4falsetruefalse002001-12-07falsefalsetruetruefalse5falsetruefalse002001-12-07falsefalsetruetruefalse6falsetruefalse002001-12-07falsefalsetruetruefalse7falsetruefalse002001-12-07falsefalsetruetruefalse8falsetruefalse00falsefalsetruetruefalseOtherxbrli:dateItemTypedateReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 4 -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$1falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_InvInsMemberRowdei_LegalEntityAxisAxiscik000276 463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalseInv 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.058falsefalsefalsetruefalse3truetruetrue0.05610.0561falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsefalsefalseOthernanafalsefalse48Average Annual Total Returns - BlackRock Total Return Fund (Inv Ins) Inv Ins BlackRock Total Return FundUnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*Rowdei_DocumentInformationDocumentAxisAxiscik000276463_InvInsMemberRowdei_LegalEntityA xisAxiscik000276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer f or the role corresponding to PerformanceTableData.No authoritative reference available.falsefalse30false0rr_PerformanceTableNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes.&nbsp;</font></font></font><font class="_mt">Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or IRAs.</font> </font><font class="_mt"><font class="_mt">After-tax returns are shown for Investor A Shares only, and the after-tax returns for Investor B, Investor C, Institutional and Class R Shares will vary.</font></font></font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIf the Fund has annual returns for at least one calendar year, provide a table showing the Fund's (A) average annual total return; (B) average annual total return (after taxes on distributions); and (C) average annual total return (after taxes on distributions and redemption). A Money Market Fund should show only the returns described in clause (A) of the preceding sentence. All returns should be shown for 1-, 5-, and 10- calendar year periods ending on the date of the most recently completed calendar year (or for the life of the Fund, if shorter), but only for periods s ubsequent to the effective date of the Fund's registration statement. The table also shouldshow the returns of an appropriate broadbased securities market index as defined in Instruction 5 to Item 22(b)(7) for the same periods. A Fund that has been in existence for more than 10 years also may include returns for the life of the Fund. A Money Market Fund may provide the Fund's 7-day yield ending on the date of the most recent calendar year or disclose a toll-free (or collect) telephone number that investors can use to obtain the Fund's current 7-day yield. For a Fund (other than a Money Market Fund or a Fund described in General Instruction C.3.(d)(iii)), provide the information in the following table with the specified captions AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, _____). For a Fund that provides annual total returns for only one calendar year or for a Fund that does not include the bar chart because it does not have annual returns for a full calendar year, modify, as appropriate, the narrative explanation required by paragraph (c)(2)(i) (e.g., by stating that the information gives some indication of the risks of an investment in the Fund by comparing the Fund's performance with a broad measure of market performance).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iv -Subsection b falsefalse129Risk/Return Summary - BlackRock Total Return Fund (Inv Ins) (Inv Ins, BlackRock Total Return Fund)UnKnownUnKnownUnKnownUnKnownfalsetrue XML 17 R16.xml IDEA: Risk/Return Summary - BlackRock Total Return Fund (Service) 2.2.0.25truefalse001148 - Document - Risk/Return Summary {Unlabeled} - BlackRock Total Return Fund (Service)falsefalsetrue1falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : Service Member {dei_LegalEntityAxis} : S000004071 Member 1/28/2011 - 1/28/2011 Duration_1_28_2011_To_1_28_20116http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalsecik000276463_ServiceMemberdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_ServiceMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalsecik000276463_S000004071Memberdei_LegalEnt ityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli01false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://www.blackrock.com/role/documentriskreturnsummaryunlabeledblackrocktotalreturnfundservice1falsefalsefalse00Service | BlackRock Total Return FundService | BlackRock Total Return Fundfalsefalsefalsefalsefalse1falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : Service Member {dei_LegalEntityAxis} : S000004071 Member 1/28/2011 - 1/28/2011 Duration_1_28_2011_To_1_28_20116http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalsecik000276463_ServiceMemberdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_ServiceMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalsecik000276463_S000004071Memberdei_LegalEnt ityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalse3false0rr_RiskReturnHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsef alsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 30pt;" class="_mt">Fund Overview</font></p> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Key Facts about BlackRock Total Return Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Investment Objectives/Goals Include the following information, in plain English under rule 421(d) under the Securities Act, in the order and subject matter indicatedReference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 falsefalse4false0rr_ObjectiveHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Investment Objective</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse5false0rr_ObjectivePrimaryTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The investment objective of the BlackRock Total Return Fund (the "Fund") is to realize a total return that exceeds that of the Barclays Capital U.S. Aggregate Bond Index.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse6false0rr_ExpenseHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Fees and Expenses of the Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Fee Table Includes the following information, in plain English under rule 421(d) under the Securities Act, after Item 2 Fees and expenses of the Fund This table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to inve st in the future, at least $[_____] in [name of fund family] funds. Shareholder Fees (fees paid directly from your investment) 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 you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be You would pay the following expenses if you did not redeem your shares The Example does not reflect sales charges (loads) on reinvested dividends [and other distributions]. If these sales charges (loads) were included, your costs would be higher. Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its po rtfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was __% of the average value of its whole portfolio. Instructions. A.3.instructions.6 New Funds. For purposes of this Item, a "New Fund" is a Fund that does not include in Form N-1A financial statements reporting operating results or that includes financial statements for the Fund's initial fiscal year reporting operating results for a period of 6 months or less. The following Instructions apply to New Funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph d -Subsection instructions falsefalse7false0rr_ExpenseNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">This table describes the fees and expenses that you may pay if you buy and hold Service Shares of the Fund.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThis table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $[_____] in [name of fund family] funds. Include the narrative explanations in the order indicated. A Fund may modify the narrative explanations if the explanation contains comparable information to that shown.The narrative explanation regarding sales charge discounts is only required by a Fund that offers such discounts and should specify the minimum level of investment required to qualify for a discount. Modify the narrative explanation to state that Fund shares are sold on a national securities exchange at the end of the time periods indicated, and that brokerage commissions for buying and selling Fund shares through a broker are not reflected.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph b -Subsection instructions falsefalse8false0rr_ShareholderFeesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="line-height: normal; margin: 0in 0in 0pt; font-family: 'Calibri','sans-serif'; font-size: 11pt;" class="MsoNormal"><b><font style="font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">Shareholder Fees <br />(fees paid directly from your investment)</font></b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringShareholder Fees (fees paid directly from your investment).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subsection table falsefalse9false0rr_ShareholderFeesTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleShareholderFeesBlackrockTotalReturnFundService column period compact * column dei_DocumentInformationDocumentAxis compact cik000276463_ServiceMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleShareholderFeesBlackrockTotalReturnFundService column period compact * column dei_DocumentInformationDocumentAxis compact cik000276463_ServiceMember column dei_ LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div>falsehttp://www.blackrock.com/role/ScheduleShareholderFeesBlackrockTotalReturnFundServicefalsefalse001156 - Schedule - Shareholder Fees - BlackRock Total Return Fund (Service)truefalsefalse1falseColumnperiodPeriod*Columndei_DocumentInformationDocumentAxisAxiscik000276463_ServiceMemberColumndei_LegalEntityAxisAxiscik000276463_S000004071MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseServicedei_DocumentInformationDocumentAxis xbrldihttp://xbrl.org/2006/xbrldicik000276463_ServiceMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseServicerr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000052630Memberrr_ProspectusShareClassAxisexplicitMemberServiceBlackRock Total Return FundServiceUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$1falseRowprimaryElement*5false0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the max imum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising tha t figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalse0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricetruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsetruefalseOthernanafalsefalse2falseRowprimaryElement*6false0rr_MaximumDeferredSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales char ges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalse0rr_MaximumDeferredSalesChargeOverOfferingPricetruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsetruefalseOthernanafalsefalse12Shareholder Fees - BlackRock Total Return Fund (Service) UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*Columndei_DocumentInformationDocumentAxisAxiscik000276463_ServiceMemberColumndei_LegalEntityAxisAxiscik000276463_S000004071MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*RowprimaryElement*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to ShareholderFeesData.No authoritative reference available.falsefalse10false0rr_OperatingExpensesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<strong><font size="2" class="_mt">Annual Fund Operating Expenses<br />(expenses that you pay each year as a percentage of the value of your investment)</font></strong>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringAnnual Fund Operating Expenses (ongoing expenses that you pay each year as a percentage of the value of your investment)Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 7 -Subsection table falsefalse11false0rr_AnnualFundOperatingExpensesTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualFundOperatingExpensesBlackrockTotalReturnFundService column period compact * column dei_DocumentInformationDocumentAxis compact cik000276463_ServiceMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualFundOperatingExpensesBlackrockTotalReturnFundService column period compact * column dei_DocumentInformationDocumentAxis compact cik000276463_ServiceMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div>falsehttp://www.blackrock.com/role/ScheduleAnnualFundOperatingExpensesBlackrockTotalReturnFundServicefalsefalse001164 - Schedule - Annual Fund Operating Expenses - BlackRock Total Return Fund (Service)truefalsefalse1falseColumnperiodPeriod*Co lumndei_DocumentInformationDocumentAxisAxiscik000276463_ServiceMemberColumndei_LegalEntityAxisAxiscik000276463_S000004071MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseServicedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_ServiceMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseServicerr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000 052630Memberrr_ProspectusShareClassAxisexplicitMemberServiceBlackRock Total Return FundServiceUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$1falseRowprimaryElement*5false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00440.0044[2]falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse0rr_ManagementFeesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[1]1truetruetrue0.00440.0044falsefalsefalsetruefalseOthernanafalsefalse2falseRowprimaryElement*6false0rr_DistributionAndService12b1FeesOverAssetsrrfalse nadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00250.0025[2]falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalse0rr_DistributionAndService12b1FeesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[1]1truetruetrue0.00250.0025falsefalsefalsetruefalseOthernanafalsefalse3falseRowprimaryElement*7false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truetruetrue0.00710.0071[2]fal sefalsefalsetruefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expe nses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions truefalse0rr_OtherExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[1]1truetruetrue0.00710.0071falsefalsefalsetruefalseOthernanafalsefalse4falseRowprimaryElement*8false0rr_Component1OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00460.0046[2]falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse0rr_Component1OtherExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[1]1truetruetrue0.00460.0046falsefalsefalsetruefalseOthernanafalsefalse5falseRowprimaryElement*9false0rr_Component2OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00250.0025[2]falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 10 -Subsection table falsefalse0rr_Component2OtherExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[1]1truetruetrue0.00250.0025falsefalsefalsetruefalseOthernanafalsefalse6falseRowprimaryElement*11false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truetruetrue0.0140.014[2]falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions truefalse0rr_ExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[1]1truetruetrue0.0140.014falsefalsefalsetruefalseOthernanafalsefalse7falseRowprimaryElement*12false0rr_FeeWaiverOrReimbursementOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue-0.0009-0.0009[1],[2]falsefalsefalsetruefalseOtherrr:NonPositivePure4TypepureTotal Annual Fund Operating Expenses. If there were expense reimbursement or fee waiver arrangements that reduced any Fund operating expenses and will continue to reduce them for no less than one year from the effective date of the Fund's registration statement, a Fund may add two captions to the table one caption showing the amount of the expense reimbursement or fee waiver, and a second caption showing the Fund's net expenses after subtracting the fee reimbursement or expense waiver from the total fund operating expenses. The Fund should place these additional captions directly below the "Total Annual Fund Operating Expenses" caption of the table and should use appropriate descriptive ca ptions, such as "Fee Waiver [and/or Expense Reimbursement]" and "Total Annual Fund Operating Expenses After Fee Waiver [and/or Expense Reimbursement]," respectively. If the Fund provides this disclosure, also disclose the period for which the expense reimbursement or fee waiver arrangement is expected to continue, and briefly describe who can terminate the arrangement and under what circumstances.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse0rr_FeeWaiverOrReimbursementOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[1][2]1truetruetrue-0.0009-0.0009falsefalsefalsetruefalseOthernanafalsefalse8falseRowprimaryElement*13false0rr_NetExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truetruetrue0.01310.0131[2]fal sefalsefalsetruefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table truefalse0rr_NetExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[1]1truetruetrue0.01310.0131falsefalsefalsetruefalseOthernanafalsefalse1The fees and expenses shown in the table and the example that follows include both the expenses of the Fund and the Fund's share of the allocated expenses of Master Total Return Portfolio (the "Portfolio").2As described in the "Management of the Fund " section of the Fund's prospectus on page 24, BlackRock has contractually agreed to waive the Total Return Fund's management fee in the amount of the Total Return Fund's share of the management fee paid by the Master Portfolio for as long as the Total Return Fund invests in the Master Portfolio. In addition, BlackRock has contractually agreed to waive and/or reimburse fees and/or expenses in order to limit Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements (excluding Dividend Expense, Interest Expense, Acquired Fund Fees and Expenses and certain other Fund expenses) to 0.85% of average daily net assets until February 1, 2012. These contractual agreements may be terminated upon 90 days' notice by a majority of the non-interested directors of the Fund or by a vote of a majority of the outstanding voting securities of the Fund.18Annual Fund Operating Expenses - BlackRock Total R eturn Fund (Service) UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*Columndei_DocumentInformationDocumentAxisAxiscik000276463_ServiceMemberColumndei_LegalEntityAxisAxiscik000276463_S000004071MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*RowprimaryElement*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to OperatingExpensesData.No authoritative reference available.falsefalse12false0rr_ExpenseExampleHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00 <div class="MetaData"> <p align="left"><font style="font-size: 11pt;" class="_mt"><strong>Example:</strong></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringHeading for Expense Example.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse13false0rr_ExpenseExampleNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">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:</font></p></div> </div>falsefalsefalsefalsefalseOtherus-t ypes:textBlockItemTypestringThe Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection example falsefalse14false0rr_ExpenseExampleWithRedemptionTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockTotalReturnFundService row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_ServiceMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockTotalReturnFundService row period compact * row primary compact * column dei_DocumentInformationDocu mentAxis compact cik000276463_ServiceMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>truehttp://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockTotalReturnFundServicefalsefalse001172 - Schedule - Expense Example {Transposed} - BlackRock Total Return Fund (Service)truefalsefalse1falseColumnperiodPeriod*Column< SelectionString>primaryElement*5false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truef alsetrue133133falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*6fals e0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue419419falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$3falseColumnperiodPeriod*ColumnprimaryElement*7fa lse0rr_ExpenseExampleYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue727727falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$4falseColumnperiodPeriod*ColumnprimaryElement*8fa lse0rr_ExpenseExampleYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue16001600falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$1falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_ServiceMemberRowdei_LegalEntityAxisAxiscik000276463_S000004 071MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalseServicedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_ServiceMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseServicerr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000052630Memberrr_ProspectusShareClassAxisexplicitMemberServiceBlackRock Total Return FundServiceUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue133133falsefalsefalsetruefalse2truefalsetrue419419falsefalsefalsetruefalse3truefalsetrue727727falsefalsefalsetruefalse4truefalsetrue16001600falsefalsefalsetruefalseOthernanafalsefalse41Expense Example - BlackRock Total Return Fund (Service) (USD $)UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*Rowdei_DocumentInformationDocumentAxisAxiscik000276463_ServiceMemberRowdei_LegalEntityAxisAxiscik000276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to ExpenseExample.No authoritative reference available.falsefalseExpense Example, With Redemption [Table]15false0rr_PortfolioTurnoverHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 11pt;" class="_mt"><b>Portfolio Turnover</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 5 -Subsection instructions falsefalse16false0rr_PortfolioTurnoverTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was&nbsp;<font class="_mt">1,754%</font> of the average value of its portfolio.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subsection example falsefalse17false0rr_StrategyHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Investment Strategies of the Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industr y or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse18false0rr_StrategyNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font></font></font></font></font></font>Both U.S. and foreign companies and governments may issue these securities.&nbsp;<font class="_mt">Under normal circumstances, the Fund invests at least 80% of its assets in bonds and invests primarily in investment grade fixed-income securities.</font> The Fund may invest in fixed-income securities of any duration or maturity.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund will invest most of its assets in securities issued by U.S. issuers, but may also invest a portion of its assets in securities issued by foreign issuers. The Fund may also invest in derivative securities for hedging purposes or to increase the return on its investments. The Total Return Fund may also enter into dollar rolls.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Total Return Fund may invest up to 20% of its net assets in fixed-income securities that are rated below investment grade by at least one of the recognized rating agencies or in unrated securities of equivalent credit quality.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund is a "feeder" fund that invests all of its assets in a corresponding "master" portfolio, the Master Total Return Portfolio (the "Master Portfolio"), a series of the Master Bond LLC (the "Master LLC"), a mutual fund that has the same investment objectives and strategies as the Fund. All investments will be made at the level of the Master Portfolio. This structure is sometimes called a "master/feeder" structure. The Fund's investment results will correspond directly to the investment results of the underlying Master Portfolio in which it invests. For simplicity, this Prospectus uses the term "Fund" to include the Master Portfolio.</font></p></div> </div>falsefalsefalsef alsefalseOtherus-types:textBlockItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse19false0rr_RiskHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Risks of Investing in the Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNarrative Risk Disclosure.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subsection b falsefalse20false0rr_RiskNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time.&nbsp;<font class="_mt">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.</font> The following is a summary description of certain risks of investing in the Fund.</font></p> <ul> <li><font style="font-size: 10pt;" class="_mt"><b><i>Credit Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Credit risk refers to the possibility that the issuer of a security will not be able to make payments of interest and principal when due. Changes in an issuer's credit rating or the market's perception of an issuer's creditworthiness may also affect the value of the Fund's investment in that issuer.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Derivatives Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund's use of derivatives may reduce the Fund's returns and/or increase volatility. Volatility is defined as the characteristic of a security, an index or a market to fluctuate significantly in price within a short time period. Derivatives are also subject to counterparty risk, which is the risk that the other party in the transaction will not fulfill its contractual obligation. A risk of the Fund's use of derivatives is that the fluctuations in their values may not correlate perfectly with the overall securities markets. The possible lack of a liquid secondary market for derivatives and the resulting inability of the Fund to sell or otherwise close a derivatives position could expose the Fund to losses and could make derivatives more difficult for the Fund to value accurately. Derivatives may give rise to a form of lev erage and may expose the Fund to greater risk and increase its costs.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Dollar Rolls Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Dollar rolls involve the risk that the market value of the securities that the Fund is committed to buy may decline below the price of the securities the Fund has sold. These transactions may involve leverage.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Extension Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates rise, certain obligations will be paid off by the obligor more slowly than anticipated, causing the value of these securities to fall.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Foreign Securities Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include:<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Changes in foreign currency exchange rates can affect the value of the Fund's portfolio.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Settlement and clearance procedures in certain foreign markets may result in delays in payment for or delivery of securities not typically associated with settlement and clearance of U.S. investments.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>High Portfolio Turnover Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund may engage in active and frequent trading of its portfolio securities. High portfolio turnover (more than 100%) may result in increased transaction costs to the Fund, including brokerage commissions, dealer mark-ups and other transaction costs on the sale of the securities and on reinvestment in other securities. The sale of Fund portfolio securities may result in the realization and/or distribution to shareholders of higher capital gains or losses as compared to a fund with less active trading policies. Given the frequency of sales, such gain or loss will likely be short-term capital gain or loss and, in the event of a gain, would increase an investor's tax liability unless shares are held through a tax-deferred or exempt vehicle. These effects of higher than normal portfolio turnover may adversely aff ect Fund performance. In addition, investment in mortgage dollar rolls and participation in TBA transactions may significantly increase the Fund's portfolio turnover rate. A TBA transaction is a method of trading mortgage-backed securities where the buyer and seller agree upon general trade parameters such as agency, settlement date, par amount, and price.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Interest Rate Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Interest rate risk is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall, and decrease as interest rates rise.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Junk Bonds Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Although junk bonds generally pay higher rates of interest than investment grade bonds, junk bonds are high risk investments that may cause income and principal losses for the Fund.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Market Risk and Selection Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Mortgage- and Asset-Backed Securities Risks</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Mortgage- and asset-backed securities represent interests in "pools" of mortgages or other assets, including consumer loans or receivables held in trust. Mortgage- and asset-backed securities are subject to credit, interest rate, prepayment and extension risks. These securities also are subject to risk of default on the underlying mortgage or asset, particularly during periods of economic downturn. Small movements in interest rates (both increases and decreases) may quickly and significantly reduce the value of certain mortgage-backed securities.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Prepayment Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates fall, certain obligations will be paid off by the obligor more quickly than originally anticipated, and the Fund may have to invest the proceeds in securities with lower yields.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Sovereign Debt Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Sovereign debt instruments are subject to the risk that a governmental entity may delay or refuse to pay interest or repay principal on its sovereign debt, due, for example, to cash flow problems, insufficient foreign currency reserves, political considerations, the relative size of the governmental entity's debt position in relation to the economy or the failure to put in place economic reforms required by the International Monetary Fund or other multilateral agencies.<br /><br /></font></li></ul></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringNarrative Risk Disclosure. A Fund may, in responding to this Item, describe the types of investors for whom the Fund is intended or the types of investment goals that may be consistent with an investment in the Fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph i -Clause instruction -Subsection b falsefalse21false0rr_BarChartAndPerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><i><strong>Performance Information</strong></i></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse22false0rr_PerformanceNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsef alse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font></font>The table compares the Fund's performance to that of the Barclays Capital U.S. Aggregate Bond Index. Effective September 24, 2007, the Fund reorganized with BlackRock Total Return Portfolio (the "Predecessor Fund"), a series of BlackRock Funds II (the "Reorganization"), and the Predecessor Fund's performance and financial history has been adopted by the Fund and will be used going forward from the date of the Reorganization. The information below is based on the performance information of the combined fund resulting from the Reorganization and that of the Predecessor Fund prior to the Reorganization (adjusted as necessary to reflect the fees applicable to Service Shares of the Fund). Prior September 24, 2007, Service Share performance results are those of Investor A Shares of the Predeccessor Fund restated to reflect Service Share fees.&nbsp;<font class="_mt">As with all such investments, past performance (before and after taxes) is not an indication of future results.</font>&nbsp;<font class="_mt">Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.</font>&nbsp;<font class="_mt">However, the table includes all applicable fees and sales charges.</font> If the Fund's investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund's returns would have been lower. Updated information on the Fund's performance can be obtained by visiting&nbsp;<font class="_mt">http://www.blackrock.com/funds</font> or can be obtained by phone at <font class="_mt"><font style="font-size: 10pt;" class="_mt">800-882-0052.</font></font> </font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse23false0rr_BarChartHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="center"><font style="font-size: 11pt;" class="_mt"><b>Service Shares<br />ANNUAL TOTAL RETURNS<br />BlackRock Total Return Fund<br />As of 12/31</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse24false0rr_BarChartTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualTotalReturnsBarChartBlackrockTotalReturnFundService column period compact * column primary compact * row dei_DocumentInformationDocumentAxis compact cik000276463_ServiceMember row dei_LegalEntityAxis compact cik000276463_S000004071Member row rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsefalseBarChart4.jpg<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualTotalReturnsBarChartBlackrockTotalReturnFundService column period compact * column primary compact * row dei_DocumentInformationDocu mentAxis compact cik000276463_ServiceMember row dei_LegalEntityAxis compact cik000276463_S000004071Member row rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsehttp://www.blackrock.com/role/ScheduleAnnualTotalReturnsBarChartBlackrockTotalReturnFundServicefalsefalse001188 - Schedule - Annual Total Returns (Bar Chart) - BlackRock Total Return Fund (Service)truefalsefalse1falseColumnperiodPeriod*Column primaryElement*ColumnunitUnit*6false0rr_AnnualReturn2002rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.08340.0834falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*7false0rr_AnnualReturn2003rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.04210.0421falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. T he Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$3falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*8false0rr_AnnualReturn2004rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.03950.0395falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. T he Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$4falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*9false0rr_AnnualReturn2005rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.02030.0203falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. T he Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$5falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*10false0rr_AnnualReturn2006rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.03680.0368falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$6falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*11false0rr_AnnualReturn2007rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.04820.0482falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$7falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*12false0rr_AnnualReturn2008rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.1141-0.1141falsefalsefalsetruefalse< /hasScenarios>Otherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes . The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$8falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*13false0rr_AnnualReturn2009rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.15950.1595falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$9falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*14false0rr_AnnualReturn2010rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.09750.0975falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$1falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_ServiceMemberRowdei_LegalEntityAxisAxiscik000276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*falsefalseServicedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_ServiceMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseServicerr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000052630Membe rrr_ProspectusShareClassAxisexplicitMemberServiceBlackRock Total Return FundService0truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.08340.0834falsefalsefalsetruefalse2truetruefalse0.04210.0421falsefalsefalsetruefalse3truetruefalse0.0395< RoundedNumericAmount>0.0395falsefalsefalsetruefalse4truetruefalse0.02030.0203falsefalsefalsetruefalse5truetruefalse0.03680.0368falsefalsefalsetruefalse6truetruefalse0.04820.0482falsefalsefalsetruefalse7truetruefalse-0.11 41-0.1141falsefalsefalsetruefalse8truetruefalse0.15950.1595falsefalsefalsetruefalse9truetruefalse0.09750.0975falsefalsefalsetruefalseOthernanafalsefalse91Annual Total Returns (Bar Chart) - BlackRock Total Return Fund (Service) UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*Rowdei_DocumentInformationDocumentAxisAxiscik000276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to BarChartData.No authoritative reference available.falsefalse25false0rr_BarChartClosingTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">During the period shown in the bar chart, the&nbsp;<font class="_mt">highest return</font> for a quarter was&nbsp;<font class="_mt">7.15%</font> (quarter ended September 30, 2009) and the&nbsp;<font class="_mt">lowest return</font> for a quarter was&nbsp;<font class="_mt">-6.93%</font> (quarter ended September 30, 2008).</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse26false0rr_PerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <div> <p style="font-family: 'Times New Roman','serif'; margin-left: 0in; font-size: 12pt; margin-right: 0in;"><b><font style="font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">As of 12/31/10<br />Average Annual Total Returns</font></b><b><font style="font-family: 'Arial','sans-serif'; font-size: 11pt;" class="_mt"> </font></b></p></div></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringThis item represents Average Anuual Total Returns. If a Multiple Class Fund offers a Class in the pros pectus that converts into another Class after a stated period, compute average annual total returns in the table by using the returns of the other Class for the period after conversion.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit c -Subsection b falsefalse27false0rr_PerformanceTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAverageAnnualTotalReturnsTransposedBlackrockTotalReturnFundService row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_ServiceMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * column rr_PerformanceMeasureAxis compact * ~&lt;/div&gt; </div>falsefalse<div> 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/>1truetruetrue0.09750.0975falsefalsefalsetruefalse2truetruetrue0.08180.0818falsefalsefalsetruefalse3truetruetrue0.06310.0631falsefalsefalsetruefalse4truetruetrue0.06540.0654falsefalsefalsetruefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*6fals e0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.04140.0414falsefalsefalsetruefalse2truetruetrue0.02950.0295falsefalsefalsetruefalse3truetruetrue0.02830.0283falsefalsefalsetruefalse4truetruetrue0.0580.058falsefalsefalsetruefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$3falseColumnperiodPeriod*ColumnprimaryElement*8fa lse0rr_AverageAnnualReturnSinceInceptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.04430.0443< CurrencyCode />falsefalsefalsetruefalse2truetruetrue0.03770.0377falsefalsefalsetruefalse3truetruetrue0.03440.0344falsefalsefalsetruefalse4truetruetrue0.05610.0561falsefalsefalsetruefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$4falseColumnperiodPeriod*ColumnprimaryElement*9false0rr_AverageAnnualReturnInceptionDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse002001-12-07falsefalsetruetruefalse2falsetruefalse002001-12-07falsefalsetruetruefalse3falsetruefalse002001-12-07falsefalsetruetruefalse4falsetruefalse00falsefalsetruetruefalseOtherxbrli:dateItemTypedateReturn Before Taxes.< /ElementDefenition>Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 4 -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$1falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_ServiceMemberRowdei_LegalEntityAxisAxiscik00027 6463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalseServicedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_ServiceMemberdei_DocumentInformationDocumentAxisexplicitMember< Segment>falsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseServicerr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000052630Memberrr_ProspectusShareClassAxisexplicitMembertruefalseBefore Taxesrr_PerformanceMeasureAxisrr_PerformanceMeasureDomainrr_PerformanceMeasureAxisexplicitMemberServiceBlackRock Total Return FundServiceBefore TaxesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700< ElementPrefix />truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.09750.0975falsefalsefalse truefalse2truetruetrue0.04140.0414falsefalsefalsetruefalse3truetruetrue0.04430.0443falsefalsefalsetruefalse4falsetruefalse002001-12-072001-12-07falsefalsetruetruefalseOthernanafalsefalse2falseRowdei_Document 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00truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.08180.0818falsefalsefalsetruefalse2truetruetrue0.02950.0295falsefalsefalsetruefalse3truetruetrue0.03770.0377falsefalsefalsetruefalse4falsetruefalse002001-12-072001-12-07falsefalsetruetruefalseOthernanafalsefalse3falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_ServiceMemberRowdei_LegalEntityAxisAxiscik000276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnitCompact*falsefalseServicedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_ServiceMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalse Servicerr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000052630Memberrr_ProspectusShareClassAxisexplicitMemberfalsefalseReturn After Taxes on Distributions and Sale of Sharesrr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldirr_AfterTaxesOnDistributionsAndSalesMemberrr_PerformanceMeasureAxisexplicitMemberServiceBlackRock Total Return FundServiceReturn After Taxes on Distributions and Sale of SharesStandard00truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.06310.0631falsefalsefalsetruefalse2truetruetrue0.02830.0283falsefalsefalsetruefalse3truetruetrue0.03440.0344falsefalsefalsetruefalse4falsetruefalse002001-12-072001-12-07falsefalsetruetruefalseOthernanafalsefalse4falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_ServiceMemberRowdei_LegalEntityAxisAxiscik000276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUn it*falsefalseServicedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_ServiceMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMembertruefalseShare Classesrr_ProspectusShareClassAxisrr_ShareClassDomainrr_ProspectusShareClassAxisexplicitMemberfalsefalseBarclays Capital U.S. Aggregate Bond Index (Reflects no deduction for fees, expenses or taxes)rr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_BarclaysCapitalUSAggregateBondIndexReflectsNoDeductionForFeesExpensesOrTaxesMemberrr_PerformanceMeasureAxisexplicitMemberServiceBlackRock Total Return FundShare ClassesBarclays Capital U.S. Agg regate Bond Index (Reflects no deduction for fees, expenses or taxes)Standard00truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.06540.0654falsefalsefalsetruefalse2truetruetrue0.0580.058falsefalsefalsetruefalse3truetruetrue0.05610.0561falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsefalsefalseOthernanafalsefalse44Average Annual Total Returns - BlackRock Total Return Fund (Service) ServiceUnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*Rowdei_DocumentInformationDocumentAxisAxiscik000276463_ServiceMemberRowdei_LegalEntityAxisAxiscik000276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresp onding to PerformanceTableData.No authoritative reference available.falsefalse28false0rr_PerformanceTableNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. </font></font><font class="_mt">Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.</font></font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIf the Fund has annual returns for at least one calendar year, provide a table showing the Fund's (A) average annual total return; (B) average annual total return (after taxes on distributions); and (C) average annual total return (after taxes on distributions and redemption). A Money Market Fund should show only the returns described in clause (A) of the preceding sentence. All returns should be shown for 1-, 5-, and 10- calendar year periods ending on the date of the most recently completed calendar year (or for the life of the Fund, if shorter), but only for periods subsequent to the effective date of the Fund's registration statement. The table also shouldshow the returns of an appropriate broadbased securities market index as defined in Instruction 5 to Item 22(b)(7) for the same periods. A Fund that has been in existence for more than 10 years also may include returns for the life of the Fund. A Money Market Fund may provide the Fund's 7-day yield ending on the date of the most recent calendar year or disclose a toll-free (or collect) telephone number that investors can use to obtain the Fund's current 7-day yield. For a Fund (other than a Money Market Fund or a Fund described in General Instruction C.3.(d)(iii)), provide the information in the following table with the specified captions AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, _____). 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XML 20 R1.xml IDEA: Risk/Return Summary - BlackRock High Income Fund (Inv Ins) 2.2.0.25truefalse001118 - Document - Risk/Return Summary {Unlabeled} - BlackRock High Income Fund (Inv Ins)falsefalsetrue1falsefalseUSDtruefalse{dei_DocumentInformationDocumentAxis} : Inv Ins Member {dei_LegalEntityAxis} : S000004072 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_20114http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalsecik000276463_InvInsMemberdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalsecik000276463_S000004072Memberdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$1false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://www.blackrock.com/role/documentriskreturnsummaryunlabeledblackrockhighincomefundinvins1falsefalsefalse00Inv Ins | BlackRock High Income FundInv Ins | BlackRock High Income Fundfalsefalsefalsefalsefalse1falsefalseUSDtruefalse{dei_DocumentInformationDocumentAxis} : Inv Ins Member {dei_LegalEntityAxis} : S000004072 Member 1/28/2011 - 1/28/2011 USD ($) $Duration_1_28_2011_To_1_28_20114http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalsecik000276463_InvInsMemberdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalsecik000276463_S000004072Memberdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse3false0rr_RiskReturnHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<d iv class="MetaData"><em><strong> </strong></em> <div> <p align="left"><font style="font-size: 30pt;" class="_mt">Fund Overview</font></p></div> <p align="left"><font style="font-size: 14pt;" class="_mt"><em><strong>Key Facts about BlackRock High Income Fund</strong></em></font></p><em><strong> </strong></em></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Investment Objectives/Goals Include the following information, in plain English under rule 421(d) under the Securities Act, in the order and subject matter indicatedReference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 falsefalse4false0rr_ObjectiveHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<em><strong><font style="font-size: 12pt;" class="_mt">Investment Objective</font></strong></em>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse5false0rr_ObjectivePrimaryTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <font style="font-size: 10pt;" class="_mt">The primary investment objective of the BlackRock High Income Fund (the "High Income Fund" or the "Fund") is to provide shareholders with as high a level of current income as is consistent with the investment policies of such Fund. </font> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type o r category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse6false0rr_ObjectiveSecondaryTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> As a secondary objective, the High Income Fund seeks capital appreciation when consistent with its primary objective. </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. 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Shareholder Fees (fees paid directly from your investment) 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 you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be You would pay the following expenses if you did not redeem your shares The Example does not reflect sales charges (loads) on reinvested dividends [and other distributions]. If these sales charges (loads) were included, your costs would be higher. Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its po rtfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was __% of the average value of its whole portfolio. Instructions. A.3.instructions.6 New Funds. For purposes of this Item, a "New Fund" is a Fund that does not include in Form N-1A financial statements reporting operating results or that includes financial statements for the Fund's initial fiscal year reporting operating results for a period of 6 months or less. The following Instructions apply to New Funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph d -Subsection instructions falsefalse8false0rr_ExpenseNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.&nbsp;<font class="_mt">You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least&nbsp;<font class="_mt">$25,000</font> in the BlackRock-advised fund complex.</font> More information about these and other discounts is available from your financial professional and in the "Details about the Share Classes" section on page 27 of the Fund's prospectus and in the "Purchase of Shares" section on page II-67 of the Fund's statement of additional information.</font></p></div> </div>falsefalsefalsefa lsefalseOtherus-types:textBlockItemTypestringThis table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $[_____] in [name of fund family] funds. Include the narrative explanations in the order indicated. A Fund may modify the narrative explanations if the explanation contains comparable information to that shown.The narrative explanation regarding sales charge discounts is only required by a Fund that offers such discounts and should specify the minimum level of investment required to qualify for a discount. Modify the narrative explanation to state that Fund shares are sold on a national securities exchange at the end of the time periods indicated, and that broker age commissions for buying and selling Fund shares through a broker are not reflected.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph b -Subsection instructions falsefalse9false0rr_ShareholderFeesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="line-height: 115%; margin: 0in 0in 10pt; font-family: 'Calibri','sans-serif'; font-size: 11pt;" class="MsoNormal"><b><font style="line-height: 115%; font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">Shareholder Fees<br />(fees paid directly from your investment)</font></b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringShareholder Fees (fees paid directly from your investment).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subsection table falsefalse10false0rr_ShareholderFeesTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleShareholderFeesBlackrockHighIncomeFundInvIns column period compact * column dei_DocumentInformationDocumentAxis compact cik000276463_InvInsMember column dei_LegalEntityAxis compact cik000276463_S000004072Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; 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A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalse0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricetruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.040.04falsefalsefalsetruefalse2truetruetrue00falsefalsefalsetruefalse3truetruetrue00falsefalsefalsetruefalse4truetruetrue00falsefalsefalsetruefalseOthernanafalsefalse2falseRowprimaryElement*6false0rr_MaximumDeferredSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00[1]falsefalsefalsetruefalse2truetruetrue0.040.04[2]falsefalsefalsetruefalse3truetruetrue00falsefalsefalsetruefalse4truetruetrue0.010.01[3]falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showi ng the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalse0rr_MaximumDeferredSalesChargeOverOfferingPricetruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00[1]falsefalsefalsetruefalse2truetruetrue0.040.04[2]falsefalsefalsetruefalse3truetruetrue0.010.01[3]falsefalsefalsetruefalse4truetruetrue00falsefalsefalsetruefalseOther nanafalsefalse3falseRowprimaryElement*7false0rr_RedemptionFeeOverRedemptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truetruetrue0.020.02falsefalsefalsetruefalse2truetruetrue0.020.0 2falsefalsefalsetruefalse3truetruetrue0.020.02falsefalsefalsetruefalse4truetruetrue0.020.02 falsefalsefalsetruefalseOtherrr:NonPositivePure4Typepure"Redemption Fee" (as a percentage of amount redeemed, if applicable) If the Fund is an Exchange-Traded Fund and issues or redeems shares in creation units of not less than 25,000 shares each, exclude any fees charged for the purchase and redemption of the Fund's creation units. "Redemption Fee" includes a fee charged for any redemption of the Fund's shares, but does not include a deferred sales charge (load) imposed upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph b -Subsection instructions falsefalse0rr_RedemptionFeeOverRedemptiontruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.020.02falsefalsefalsetruefalse2truetruetrue0.020.02falsefalsefalsetruefalse3truetruetrue0.020.02falsefalsefalsetruefalse4truetruetrue0.020.02falsefalsefalsetruefalseOthernanafalsefalse1 A contingent deferred sales charge ("CDSC") of 0.75% is assessed on certain redemptions of Investor A Shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase of an investment of $1,000,000 or more.2 The CDSC is 4.00% if shares are redeemed within two years. The CDSC for Investor B Shares decreases for redemptions made in subsequent years. After six years there is no CDSC on Investor B Shares. (See the section "Details about the Share Classes &#8212; Investor B Shares" for the complete schedule of CDSCs.)3 There is no CDSC on Investor C Shares after one year.43Shareholder Fees - BlackRock High Income Fund (Inv Ins) Inv Ins BlackRock High Income FundUnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*Columndei_DocumentInformationDocumentAxisAxiscik000276463_InvInsMemberColumndei_LegalEntityAxisAxiscik000276463_S000004072MemberColumnrr_Pro spectusShareClassAxisAxis*ColumnunitUnit*RowprimaryElement*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to ShareholderFeesData.No authoritative reference available.falsefalse11false0rr_OperatingExpensesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"><strong> </strong> <table border="0" cellspacing="0" cellpadding="0" width="100%"> <tr><td> <p style="margin-top: 0px; margin-bottom: 0px;"><strong><font class="_mt" size="2">Annual Fund Operating Expenses<br /></font><font style="font-size: 9pt;" class="_mt">(expenses that you pay each year as </font></strong></p> <p style="margin-top: 0px; margin-bottom: 0px;"><strong><font style="font-size: 9pt;" class="_mt">a percentage of the value of your investment)</font></strong></p></td></tr></table></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringAnnual Fund Operating Expenses (ongoing expenses that you pay each year as a percentage of the value of your investment)Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 7 -Subsection table falsefalse12false0rr_AnnualFundOperatingExpensesTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualFundOperatingExpensesBlackrockHighIncomeFundInvIns column 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include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse0rr_ManagementFeesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00420.0042falsefalsefalsetruefalse2truetruetrue0.00420.0042falsefalsefalsetruefalse3truetruetrue0.00420.0042falsefalsefalsetruefalse4truetruetrue0.00420.0042falsefalsefalsetruefalseOthernanafalsefalse2falseRowprimaryElement*6false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition 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Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalse0rr_DistributionAndService12b1FeesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00250.0025falsefalsefalsetruefalse2truetruetrue0.00750.0075falsefalsefalsetruefalse3truetruetrue0.010.01< /RoundedNumericAmount>falsefalsefalsetruefalse4truetruetrue00falsefalsefalsetruefalseOthernanafalsefalse< /IsEPS>3falseRowprimaryElement*7false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00260.0026falsefalsefalsetruefalse2truetruetrue0.00380.0038falsefalsefalsetruefalse3truetruetrue0.00280.0028falsefalsefalsetruefalse4truetruetrue0.0050.005falsefalsefalsetruefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expense s" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions falsefalse0rr_OtherExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00260.0026falsefalsefalsetruefalse2truetruetrue0.00380.0038falsefalsefalsetruefalse3truetruetrue0.0050.005 falsefalsefalsetruefalse4truetruetrue0.00280.0028falsefalsefalsetruefalseOthernanafalsefalse4falseRowprimaryElement*8false0rr_Component1OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00010.0001falsefalsefalsetruefalse2truetruetrue0.00010.0001falsefalsefalsetruefalse3truetruetrue0.00010.0001falsefalsefalsetruefalse4truetruetrue0.00010.0001falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse0rr_Component1OtherExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00010.0001falsefalsefalsetruefalse2truetruetrue0.00010.0001falsefalsefalsetruefalse3truetruetrue0.00010.0001falsefalsefalsetruefalse4truetruetrue0.00010.0001falsefalsefalsetruefalseOthernanafalsefalse5falseRowprimaryElement*9false0rr_Component2OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00250.0025falsefalsefalsetruefalse2truetruetrue0.00370.0037falsefalsefal setruefalse3truetruetrue0.00270.0027falsefalsefalsetruefalse4truetruetrue0.00490.0049falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 10 -Subsection table falsefalse0rr_Component2OtherExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00250.0025 falsefalsefalsetruefalse2truetruetrue0.00370.0037falsefalsefalsetruefalse3truetruetrue0.00490.0049falsefalsefalsetruefalse4truetruetrue0.00270.0027falsefalsefalsetruefalseOthernanafalsefalse6falseRowprimaryElement*11false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse< /IsEndingBalance>falsetotallabel1truetruetrue0.00930.0093falsefalsefalsetruefalse2truetruetrue0.01550.0155falsefalsefalsetruefalse3truetruetrue0.0070.007falsefalsefalsetruefalse4truetruetrue0.01920.0192falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense re imbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions truefalse0rr_ExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00930.0093falsefalsefalsetruefalse2truetruetrue0.01550.0155falsefalsefalsetruefalse3truetruetrue0.01920.0192< NonNumbericText />falsefalsefalsetruefalse4truetruetrue0.0070.007falsefalsefalsetruefalseOthernanafalsefalse46Annual Fund Operating Expenses - BlackRock High Income Fund (Inv Ins) Inv Ins BlackRock High Income FundUnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*Columndei_DocumentInformationDocumentAxisAxiscik000276463_InvInsMemberColumndei_LegalEntityAxisAxiscik000276463_S000004072MemberColumnrr_Pro spectusShareClassAxisAxis*ColumnunitUnit*RowprimaryElement*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to OperatingExpensesData.No authoritative reference available.falsefalse13false0rr_ExpenseExampleHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 11pt;" class="_mt"><b>Example:</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringHeading for Expense Example.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse14false0rr_ExpenseExampleNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">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:</font></p></div> </div>falsefalsefalsefalsefalseOtherus-t ypes:textBlockItemTypestringThe Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection example falsefalse15false0rr_ExpenseExampleWithRedemptionTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockHighIncomeFundInvIns row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_InvInsMember column dei_LegalEntityAxis compact cik000276463_S000004072Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockHighIncomeFundInvIns row period compact * row primary compact * column dei_DocumentInformationDocumentA xis compact cik000276463_InvInsMember column dei_LegalEntityAxis compact cik000276463_S000004072Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>truehttp://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockHighIncomeFundInvInsfalsefalse001130 - Schedule - Expense Example {Transposed} - BlackRock High Income Fund (Inv Ins)truefalsefalse1falseColumnperiodPeriod*ColumnprimaryElement*5false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue491491falsefalsefalsetruefalse2truefalsetrue558558falsefalsefalsetruefalse3truefalsetrue7272falsefalsefalsetruefalse4truefalsetrue295295falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*6fals e0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue685685falsefalsefalsetruefalse2truefalsetrue790790falsefalsefalsetruefalse3truefalsetrue224224falsefalsefalsetruefalse4truefalsetrue603603falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$3falseColumnperiodPeriod*ColumnprimaryElement*7fa lse0rr_ExpenseExampleYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue894894falsefalsefalsetruefalse2truefalsetrue10451045falsefalsefalsetruefalse3truefalsetrue390390falsefalsefalsetruefalse4truefalsetrue10371037falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$4falseColumnperiodPeriod*ColumnprimaryElement*8fa lse0rr_ExpenseExampleYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue14971497falsefalsefalsetruefalse2truefalsetrue18451845falsefalsefalsetruefalse3truefalsetrue871871falsefalsefalsetruefalse4truefalsetrue22432243falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for t he time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$1falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_InvInsMemberRowdei_LegalEntityAxisAxiscik000276463_S0000040 72MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor Arr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011392Memberrr_ProspectusShareClassAxisexplicitMemberInv InsBlackRock High Income FundInvestor AUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue491491falsefalsefalsetruefalse2truefalsetrue685685falsefalsefalsetruefalse3truefalsetrue894894falsefalsefalsetruefalse4truefalsetrue14971497falsefalsefalsetruefalseOthernanafalsefalse2falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_InvInsMemberRowdei_LegalEntityAxisAxiscik000276463_S000004072MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberfalsefalseInves tor Brr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011393Memberrr_ProspectusShareClassAxisexplicitMemberInv InsBlackRock High Income FundInvestor BUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue558558falsefalsefalsetruefalse2truefalsetrue790790falsefalsefalsetruefalse3truefalsetrue10451045falsefalsefalsetruefalse4truefalsetrue18451845falsefalsefalsetruefalseOthernanafalsefalse3falseRowdei_Docu mentInformationDocumentAxisAxiscik000276463_InvInsMemberRowdei_LegalEntityAxisAxiscik000276463_S000004072MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvIns Memberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor Crr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000037622Memberrr_ProspectusShareClassAxisexplicitMemberInv Ins< string>BlackRock High Income FundInvestor CUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalse< /IsTuple>falsefalsefalsefalsefalse1truefalsetrue295295falsefalsefalsetruefalse2truefalsetrue603603< NonNumericTextHeader />falsefalsefalsetruefalse3truefalsetrue10371037falsefalsefalsetruefalse4truefalsetrue22432243 falsefalsefalsetruefalseOthernanafalsefalse4falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_InvInsMemberRowdei_LegalEntityAxisAxiscik000276463_S000004072MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberfalsefalseInstitutionalrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011395Memberrr_ProspectusShareClassAxisexplicitMemberInv InsBlackRock High Income FundInstitutionalUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso4217< MeasureSchema />00truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1true< IsRatio>falsetrue7272falsefalsefalsetruefalse2truefalsetrue224224falsefalsefalsetruefalse3truefalsetrue390390falsefalsefalsetruefalse4truefalsetrue871871falsefalsefalsetruefalseOther nanafalsefalse44Expense Example - BlackRock High Income Fund (Inv Ins) Inv Ins BlackRock High Income Fund (USD $)UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*Rowdei_DocumentInformationDocumentAxisAxiscik000276463_InvInsMemberRowdei_LegalEntityAxisAxiscik000276463_S000004072MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to ExpenseExample.No authoritative reference available.falsefalseExpense Example, With Redemption [Table]16false0rr_ExpenseExampleNoRedemptionByYearCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">You would pay the following expenses if you did not redeem your shares:</font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse17false0rr_ExpenseExampleNoRedemptionTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleNoRedemptionTransposedBlackrockHighIncomeFundInvIns row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_InvInsMember column dei_LegalEntityAxis compact cik000276463_S000004072Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleNoRedemptionTransposedBlackrockHighIncomeFundInvIns row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_InvInsMember column dei_LegalEntityAxis compact cik000276463_S000004072Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>truehttp://www.blackrock.com/role/ScheduleExpenseExampleNoRedemptionTransposedBlackrockHighIncomeFundInvInsfalsefalse001134 - Schedule - Expense Example, No Redemption {Transposed} - BlackRock High Income Fund (Inv Ins)truefalsefalse1falseColumnperiodPeriod*ColumnprimaryElement*5false0rr_ExpenseExampleNoRedemptionYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue158158falsefalsefalsetruefalse2truefalsetrue195195falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*6fals e0rr_ExpenseExampleNoRedemptionYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue490490falsefalsefalsetruefalse2truefalsetrue603603falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not re deem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$3falseColumnperiodPeriod*ColumnprimaryElement*7fa lse0rr_ExpenseExampleNoRedemptionYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue845845falsefalsefalsetruefalse2truefalsetrue10371037falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did no t redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subparagraph f -Subsection instructions falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$4falseColumnperiodPeriod*ColumnprimaryElement*8fa lse0rr_ExpenseExampleNoRedemptionYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue18451845falsefalsefalsetruefalse2truefalsetrue22432243falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subparagraph f -Subsection instructions falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$1falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_InvInsMemberRowdei_LegalEntityAxisAxiscik000276463_S0000040 72MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor Brr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011393Memberrr_ProspectusShareClassAxisexplicitMemberInv InsBlackRock High Income FundInvestor BUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue158158falsefalsefalsetruefalse2truefalsetrue490490falsefalsefalsetruefalse3truefalsetrue845845falsefalsefalsetruefalse4truefalsetrue18451845falsefalsefalsetruefalseOthernanafalsefalse2falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_InvInsMemberRowdei_LegalEntityAxisAxiscik000276463_S000004072MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberfalsefalseInves tor Crr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000037622Memberrr_ProspectusShareClassAxisexplicitMemberInv InsBlackRock High Income FundInvestor CUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue195195falsefalsefalsetruefalse2truefalsetrue603603falsefalsefalsetruefalse3truefalsetrue10371037falsefalsefalsetruefalse4truefalsetrue22432243falsefalsefalsetruefalseOthernanafalsefalse42Expense Example, No Redemption - BlackRock High Income Fund (Inv Ins) Inv Ins BlackRock High Income Fund (USD $)UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*Rowdei_DocumentInformationDocumentAxisAxiscik000276463_InvInsMemberRowdei_LegalEntityAxisAxiscik000276463_S000004072MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to ExpenseExampleNoRedemption.No authoritative reference available.falsefalse 18false0rr_PortfolioTurnoverHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 11pt;" class="_mt"><b>Portfolio Turnover</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 5 -Subsection instructions falsefalse19false0rr_PortfolioTurnoverTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was&nbsp;<font class="_mt">97%</font> of the average value of its portfolio.</font></p></div> </div>falsefalsefalsefalsefalse Otherus-types:textBlockItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subsection example falsefalse20false0rr_StrategyHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Investment Strategies of the Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industr y or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse21false0rr_StrategyNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The High Income Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font></font>Both U.S. and foreign companies and governments may issue these securities.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">Under normal circumstances, the High Income Fund invests at least 80% of its assets in bonds that are rated in the lower rating categories by at least one of the recognized rating agencies including Baa or lower by Moody's Investors Service, Inc. ("Moody's") or BBB or lower by Standard &amp; Poor's ("S&amp;P") or Fitch Ratings ("Fitch"), or in unrated securities that Fund management believes are of comparable quality. Securities rated below Baa by Moody's or below BBB by S&amp;P or Fitch are commonly known as "junk bonds." Junk bonds are high-risk investments that may cause income and principal losses for the High Income Fund. The High Income Fund may invest in fixed-income securities of any duration or maturity. The High Income Fund may also invest up to 15% of its net assets in secondary market purchases of corporate loans.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The High Income Fund will invest most of its assets in securities issued by U.S. issuers, but may also invest a portion of its assets in securities issued by foreign issuers. The Fund may also invest in derivative securities for hedging purposes or to increase the return on its investments.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by i dentifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse22false0rr_RiskHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Risks of Investing in the Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNarrative Risk Disclosure.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subsection b falsefalse23false0rr_RiskNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p class="MetaData" align="left"><font style="font-size: 10pt;" class="_mt">Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time.<font class="_mt">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.</font> The following is a summary description of certain risks of investing in the Fund.</font></p> <div> <ul> <li><font style="font-size: 10pt;" class="_mt"><b><i>Corporate Loans Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Commercial banks and other financial institutions or institutional investors make corporate loans to companies that need capital to grow or restructure. Borrowers generally pay interest on corporate loans at rates that change in response to changes in market interest rates such as the London Interbank Offered Rate ("LIBOR") or the prime rates of U.S. banks. As a result, the value of corporate loan investments is generally less exposed to the adverse effects of shifts in market interest rates than investments that pay a fixed rate of interest.<br /></font></li></ul></div> <ul> <li><font style="font-size: 10pt;" class="_mt"><b><i>Credit Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Credit risk refers to the possibility that the issuer of a security will not be able to make payments of interest and principal when due. Changes in an issuer's credit rating or the market's perception of an issuer's creditworthiness may also affect the value of the Fund's investment in that issuer.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Derivatives Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund's use of derivatives may reduce the Fund's returns and/or increase volatility. Volatility is defined as the characteristic of a security, an index or a market to fluctuate significantly in price within a short time period. Derivatives are also subject to counterparty risk, which is the risk that the other party in the transaction will not fulfill its contractual obligation. A risk of the Fund's use of derivatives is that the fluctuations in their values may not correlate perfectly with the overall securities markets. The possible lack of a liquid secondary market for derivatives and the resulting inability of the Fund to sell or otherwise close a derivatives position could expose the Fund to losses and could make derivatives more difficult for the Fund to value accurately. Derivatives may give rise to a form of lev erage and may expose the Fund to greater risk and increase its costs.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Extension Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates rise, certain obligations will be paid off by the obligor more slowly than anticipated, causing the value of these securities to fall.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Foreign Securities Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include:<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Changes in foreign currency exchange rates can affect the value of the Fund's portfolio.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Settlement and clearance procedures in certain foreign markets may result in delays in payment for or delivery of securities not typically associated with settlement and clearance of U.S. investments.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Interest Rate Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Interest rate risk is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall, and decrease as interest rates rise.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Junk Bonds Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Although junk bonds generally pay higher rates of interest than investment grade bonds, junk bonds are high risk investments that may cause income and principal losses for the Fund.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Market Risk and Selection Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Prepayment Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates fall, certain obligations will be paid off by the obligor more quickly than originally anticipated, and the Fund may have to invest the proceeds in securities with lower yields.<br /><br /></font></li></ul></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringNarrative Risk Disclosure. A Fund may, in responding to thi s Item, describe the types of investors for whom the Fund is intended or the types of investment goals that may be consistent with an investment in the Fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph i -Clause instruction -Subsection b falsefalse24false0rr_BarChartAndPerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><i><strong>Performance Information</strong></i></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse25false0rr_PerformanceNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsef alse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font></font>The table compares the Fund's performance to that of the Barclays Capital U.S. Corporate High Yield 2% Issuer Capped Index. Prior to October 2, 2006, Investor C Share performance results are those of Institutional Shares (which have no distribution or service fees) restated to reflect Investor C Share fees.&nbsp;<font class="_mt">As with all such investments, past performance (before and after taxes) is not an indication of future results.</font>&nbsp;<font class="_mt">Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.</font>&nbsp;<font class="_mt">However, the table includes all applicable fees and sales charges.</font> If the Fund's investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund's returns would have been lower. Updated information on the Fund's performance can be obtained by visiting&nbsp;<font class="_mt">http://www.blackrock.com/funds</font> or can be obtained by phone at <font class="_mt">800-882-0052</font>. </font><font style="font-size: 10pt;" class="_mt"> </font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse26false0rr_BarChartHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="center"><font style="font-size: 11pt;" class="_mt"><b>Investor A Shares<br />ANNUAL TOTAL RETURNS<br />BlackRock High Income Fund<br />As of 12/31</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse27false0rr_BarChartTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualTotalReturnsBarChartBlackrockHighIncomeFundInvIns column period compact * column primary compact * row dei_DocumentInformationDocumentAxis compact cik000276463_InvInsMember row dei_LegalEntityAxis compact cik000276463_S000004072Member row rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsefalseBarChart1.jpg<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualTotalReturnsBarChartBlackrockHighIncomeFundInvIns column period compact * column primary compact * row dei_DocumentInformationDocumentA xis compact cik000276463_InvInsMember row dei_LegalEntityAxis compact cik000276463_S000004072Member row rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsehttp://www.blackrock.com/role/ScheduleAnnualTotalReturnsBarChartBlackrockHighIncomeFundInvInsfalsefalse001138 - Schedule - Annual Total Returns (Bar Chart) - BlackRock High Income Fund (Inv Ins)truefalsefalse1falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*5false0rr_AnnualReturn2001rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefal se1truetruefalse-0.0008-0.0008falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*6false0rr_AnnualReturn2002rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.0282-0.0282falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$3falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*7false0rr_AnnualReturn2003rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.32080.3208falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. T he Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$4falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*8false0rr_AnnualReturn2004rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.11660.1166falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. T he Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$5falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*9false0rr_AnnualReturn2005rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.01120.0112falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. T he Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$6falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*10false0rr_AnnualReturn2006rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.12360.1236falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$7falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*11false0rr_AnnualReturn2007rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.01820.0182falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$8falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*12false0rr_AnnualReturn2008rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.322-0.322falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$9falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*13false0rr_AnnualReturn2009rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.56870.5687falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$10falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*14false0rr_AnnualReturn2010rrfalsenaduration No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.18750.1875falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$1falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_InvInsMemberRowdei_LegalEntityAxisAxiscik000276463_S000004072MemberRowrr_ProspectusShareClassAxisAxis*falsefalseInv Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor Arr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011392Membe rrr_ProspectusShareClassAxisexplicitMemberInv InsBlackRock High Income FundInvestor A0truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.0008-0.0008falsefalsefalsetruefalse2truetruefalse-0.0282-0.0282falsefalsefalsetruefalse3truetruefalse0.32080.3208falsefalsefalsetruefalse4truetruefalse0.11660.1166falsefalsefalsetruefalse5truetruefalse0.01120.0112falsefalsefalsetruefalse6truetruefalse0.12360.1236falsefalsefalsetruefalse7truetruefalse0.01820.0182falsefalsefalsetruefalse8truetruefalse-0.322-0.322falsefalsefalsetruefalse9truetruefalse0.56870.5687falsefalsefalsetruefalse10truetruefalse0.18750.1875falsefalsefalsetruefalseOthernanafalsefalse101Annual Total Returns (Bar Chart) - BlackRock High Income Fund (Inv Ins) UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*Rowdei_DocumentInformationDocumentAxisAxiscik000276463_S000004072MemberRowrr_ProspectusShareClassAxisAxis*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to BarChartData.No authoritative reference available.falsefalse28false0rr_BarChartClosingTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">During the ten-year period shown in the bar chart, the&nbsp;<font class="_mt">highest return</font> for a quarter was&nbsp;<font class="_mt">20.39%</font> (quarter ended June 30, 2009) and the&nbsp;<font class="_mt">lowest return</font> for a quarter was&nbsp;<font class="_mt">-23.78%</font> (quarter ended December 31, 2008).</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIf the Fund has a nnual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse29false0rr_PerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<b><font style="line-height: 115%; font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">As of 12/31/10<br />Average Annual Total Returns </font></b>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringThis item represents Average Anuual Total Returns. If a Multiple Class Fund offers a Class in the prospectus that converts into another Class after a stated period, compute average annual total returns in the table by using the returns of the other Class for the period after conversion.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit c -Subsection b falsefalse30false0rr_PerformanceTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAverageAnnualTotalReturnsTransposedBlackrockHighIncomeFundInvIns row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_InvInsMember column dei_LegalEntityAxis compact cik000276463_S000004072Member column rr_ProspectusShareClassAxis compact * column rr_PerformanceMeasureAxis compact * ~&lt;/div&gt; </div>falsefalse<div> 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Insdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_InvInsMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldic ik000276463_S000004072Memberdei_LegalEntityAxisexplicitMembertruefalseShare Classesrr_ProspectusShareClassAxisrr_ShareClassDomainrr_ProspectusShareClassAxisexplicitMemberfalsefalseBarclays Capital U.S. Corporate High Yield 2% Issuer Capped Index (Reflects no deduction for fees, expenses or taxes)rr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_BarclaysCapitalUSCorporateHighYield2IssuerCappedIndexMemberrr_PerformanceMeasureAxisexpl icitMemberInv InsBlackRock High Income FundShare ClassesBarclays Capital U.S. Corporate High Yield 2% Issuer Capped Index (Reflects no deduction for fees, expenses or taxes)Standard00truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.14940.1494falsefalsefalsetruefalse2truetruetrue0.0890.089falsefalsefalsetruefalse3truetruetrue0.09010.0901falsefalsefalsetruefalseOthernanafalsefalse37Average Annual Total Returns - BlackRock High Income Fund (Inv Ins) Inv Ins BlackRock High Income FundUnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*Rowdei_DocumentInformationDocumentAxisAxiscik000276463_InvInsMemberRowdei_LegalEntityAx isAxiscik000276463_S000004072MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer fo r the role corresponding to PerformanceTableData.No authoritative reference available.falsefalse31false0rr_PerformanceTableNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p style="font-family: 'Times New Roman','serif'; margin-left: 0in; font-size: 12pt; margin-right: 0in;"><font style="font-family: 'Arial','sans-serif'; font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-family: 'Arial','sans-serif'; font-size: 10pt;" class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes.&nbsp;</font></font><font class="_mt">Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts ("IRAs").</font> <font class="_mt">After-tax returns are shown for Investor A Shares only, and the after-tax returns for Investor B, Investor C and Institutional Shares will vary.</font></font></p>& lt;/div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIf the Fund has annual returns for at least one calendar year, provide a table showing the Fund's (A) average annual total return; (B) average annual total return (after taxes on distributions); and (C) average annual total return (after taxes on distributions and redemption). A Money Market Fund should show only the returns described in clause (A) of the preceding sentence. All returns should be shown for 1-, 5-, and 10- calendar year periods ending on the date of the most recently completed calen dar year (or for the life of the Fund, if shorter), but only for periods subsequent to the effective date of the Fund's registration statement. The table also shouldshow the returns of an appropriate broadbased securities market index as defined in Instruction 5 to Item 22(b)(7) for the same periods. A Fund that has been in existence for more than 10 years also may include returns for the life of the Fund. A Money Market Fund may provide the Fund's 7-day yield ending on the date of the most recent calendar year or disclose a toll-free (or collect) telephone number that investors can use to obtain the Fund's current 7-day yield. For a Fund (other than a Money Market Fund or a Fund described in General Instruction C.3.(d)(iii)), provide the information in the following table with the specified captions AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, _____). For a Fund that provides annual total returns for only one calendar year or for a Fund that does not include the bar chart because it does not have annual returns for a full calendar year, modify, as appropriate, the narrative explanation required by paragraph (c)(2)(i) (e.g., by stating that the information gives some indication of the risks of an investment in the Fund by comparing the Fund's performance with a broad measure of market performance).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iv -Subsection b falsefalse130Risk/Return Summary - BlackRock High Income Fund (Inv Ins) (Inv Ins, BlackRock High Income Fund)UnKnownUnKnownUnKnownUnKnownfalsetrue XML 21 R2.xml IDEA: Risk/Return Summary - BlackRock High Income Fund (Service) 2.2.0.25truefalse001120 - Document - Risk/Return Summary {Unlabeled} - BlackRock High Income Fund (Service)falsefalsetrue1falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : Service Member {dei_LegalEntityAxis} : S000004072 Member 1/28/2011 - 1/28/2011 Duration_1_28_2011_To_1_28_20117http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalsecik000276463_ServiceMemberdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_ServiceMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalsecik000276463_S000004072Memberdei_LegalEnt ityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli01false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://www.blackrock.com/role/documentriskreturnsummaryunlabeledblackrockhighincomefundservice1falsefalsefalse00Service | BlackRock High Income FundService | BlackRock High Income Fundfalsefalsefalsefalsefalse1falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : Service Member {dei_LegalEntityAxis} : S000004072 Member 1/28/2011 - 1/28/2011 Duration_1_28_2011_To_1_28_20117http://www.sec.gov/CIK0000276463duration2011-01-28T00:00:002011-01-28T00:00:00falsefalsecik000276463_ServiceMemberdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_ServiceMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalsecik000276463_S000004072Memberdei_LegalEnt ityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberUnit1Standardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalse3false0rr_RiskReturnHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefa lsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 30pt;" class="_mt">Fund Overview</font></p> <p align="left"><font style="font-size: 14pt;" class="_mt"><b><i>Key Facts about BlackRock High Income Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Investment Objectives/Goals Include the following information, in plain English under rule 421(d) under the Securities Act, in the order and subject matter indicatedReference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 falsefalse4false0rr_ObjectiveHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Investment Objective</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse5false0rr_ObjectivePrimaryTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <font style="font-size: 10pt;" class="_mt">The primary investment objective of the BlackRock High Income Fund (the "High Income Fund" or the "Fund") is to provide shareholders with as high a level of current income as is consistent with the investment policies of such Fund. </font> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type o r category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse6false0rr_ObjectiveSecondaryTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> As a secondary objective, the High Income Fund seeks capital appreciation when consistent with its primary objective. </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse7false0rr_ExpenseHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Fees and Expenses of the Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Fee Table Includes the following information, in plain English under rule 421(d) under the Securities Act, after Item 2 Fees and expenses of the Fund This table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to inve st in the future, at least $[_____] in [name of fund family] funds. Shareholder Fees (fees paid directly from your investment) 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 you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be You would pay the following expenses if you did not redeem your shares The Example does not reflect sales charges (loads) on reinvested dividends [and other distributions]. If these sales charges (loads) were included, your costs would be higher. Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its po rtfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was __% of the average value of its whole portfolio. Instructions. A.3.instructions.6 New Funds. For purposes of this Item, a "New Fund" is a Fund that does not include in Form N-1A financial statements reporting operating results or that includes financial statements for the Fund's initial fiscal year reporting operating results for a period of 6 months or less. The following Instructions apply to New Funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph d -Subsection instructions falsefalse8false0rr_ExpenseNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">This table describes the fees and expenses that you may pay if you buy and hold Investor C1 Shares of the Fund.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThis table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $[_____] in [name of fund family] funds. Include the narrative explanations in the order indicated. A Fund may modify the narrative explanations if the explanation contains comparable information to that shown.The narrative explanation regarding sales charge discounts is only required by a Fund that offers such discounts and should specify the minimum level of investment required to qualify for a discount. Modify the narrative explanation to state that Fund shares are sold on a national securities exchange at the end of the time periods indicated, and that brokerage commissions for buying and selling Fund shares through a broker are not reflected.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph b -Subsection instructions falsefalse9false0rr_ShareholderFeesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="line-height: 115%; margin: 0in 0in 10pt; font-family: 'Calibri','sans-serif'; font-size: 11pt;" class="MsoNormal"><b><font style="line-height: 115%; font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">Shareholder Fees<br />(fees paid directly from your investment)</font></b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringShareholder Fees (fees paid directly from your investment).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subsection table falsefalse10false0rr_ShareholderFeesTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleShareholderFeesBlackrockHighIncomeFundService column period compact * column dei_DocumentInformationDocumentAxis compact cik000276463_ServiceMember column dei_LegalEntityAxis compact cik000276463_S000004072Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleShareholderFeesBlackrockHighIncomeFundService column period compact * column dei_DocumentInformationDocumentAxis compact cik000276463_ServiceMember column dei_L egalEntityAxis compact cik000276463_S000004072Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div>falsehttp://www.blackrock.com/role/ScheduleShareholderFeesBlackrockHighIncomeFundServicefalsefalse001124 - Schedule - Shareholder Fees - BlackRock High Income Fund (Service)truefalsefalse1falseColumnperiodPeriod*Columndei_DocumentInformationDocumentAxisAxiscik000276463_ServiceMemberColumndei_LegalEntityAxisAxiscik000276463_S000004072MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseServicedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_ServiceMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor C1 Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011394Memberrr_ProspectusShareClassAxis< /dimensionId>explicitMemberServiceBlackRock High Income FundInvestor C1 SharesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$1falseRowprimaryElement*5false0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2. a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amoun ts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalse0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricetruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsetruefalseOthernanafalsefalse2falseRowprimaryElement*6false0rr_MaximumDeferredSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.010.01[1]falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amou nt of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalse0rr_MaximumDeferredSalesChargeOverOfferingPricetruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[1]1truetruetrue0.010.01falsefalsefalsetruefalseOthernanafalsefalse3falseRowprimaryElement*7false0rr_RedemptionFeeOverRedemptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truetruetrue0.020.02 falsefalsefalsetruefalseOtherrr:NonPositivePure4Typepure"Redemption Fee" (as a percentage of amount redeemed, if applicable) If the Fund is an Exchange-Traded Fund and issues or redeems shares in creation units of not less than 25,000 shares each, exclude any fees charged for the purchase and redemption of the Fund's creation units. "Redemption Fee" includes a fee charged for any redemption of the Fund's shares, but does not include a deferred sales charge (load) imposed upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph b -Subsection instructions falsefalse0rr_RedemptionFeeOverRedemptiontruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.020.02falsefalsefalsetruefalseOthernanafalsefalse1 There is no contingent deferred sales charge ("CDSC") on Investor C1 Shares after one year.13Shareholder Fees - BlackRock High Income Fund (Service) UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*Columndei_DocumentInformationDocumentAxisAxiscik000276463_ServiceMemberColumndei_LegalEntityAxisAxiscik000276463_S000004072MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*RowprimaryElement*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to ShareholderFeesData.No authoritative reference available.falsefalse11false0rr_OperatingExpensesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font class="_mt"><strong><font size="2" class="_mt">Annual Fund Operating Expenses<br /></font><font style="font-size: 9pt;" class="_mt">(expenses that you pay each year as a percentage of the value of your investment)</font></strong> </font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringAnnual Fund Operating Expenses (ongoing expenses that you pay each year as a percentage of the value of your investment)R eference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 7 -Subsection table falsefalse12false0rr_AnnualFundOperatingExpensesTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualFundOperatingExpensesBlackrockHighIncomeFundService column period compact * column dei_DocumentInformationDocumentAxis compact cik000276463_ServiceMember column dei_LegalEntityAxis compact cik000276463_S000004072Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualFundOperatingExpensesBlackrockHighIncomeFundService column period compact * column dei_DocumentInformationDocumentAxis compact c ik000276463_ServiceMember column dei_LegalEntityAxis compact cik000276463_S000004072Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div>falsehttp://www.blackrock.com/role/ScheduleAnnualFundOperatingExpensesBlackrockHighIncomeFundServicefalsefalse001128 - Schedule - Annual Fund Operating Expenses - BlackRock High Income Fund (Service)truefalsefalse1falseColumnperiodPeriod*Column dei_DocumentInformationDocumentAxisAxiscik000276463_ServiceMemberColumndei_LegalEntityAxisAxiscik000276463_S000004072MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseServicedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_ServiceMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor C1 Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik00027646 3_C000011394Memberrr_ProspectusShareClassAxisexplicitMemberServiceBlackRock High Income FundInvestor C1 SharesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$1falseRowprimaryElement*5false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00420.0042falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment adv isory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse0rr_ManagementFeesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00420.0042falsefalsefalsetruefalseOthernanafalsefalse2falseRowprimaryElement*6false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.0080.008falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalse0rr_DistributionAndService12b1FeesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.0080.008falsefalsefalsetruefalseOthernanafalsefalse3falseRowprimaryElement*7false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00370.0037falsefalsefalsetruefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" woul d have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions falsefalse0rr_OtherExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00370.0037falsefalsefalsetruefalseOthernanafalsefalse4falseRowprimaryElement*8false0rr_Component1OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00010.0001falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse0rr_Component1OtherExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00010.0001falsefalsefalsetruefalseOthernanafalsefalse5falseRowprimaryElement*9false0rr_Component2OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00360.0036falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 10 -Subsection table falsefalse0rr_Component2OtherExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00360.0036 falsefalsefalsetruefalseOthernanafalsefalse6falseRowprimaryElement*11false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truetruetrue0.01590.0159falsefalse< DisplayDateInUSFormat>falsetruefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions truefalse0rr_ExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.01590.0159falsefalsefalsetruefalseOthernanafalsefalse16Annual Fund Operating Expenses - BlackRock High Income Fund (Service) UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*Columndei_DocumentInformationDocumentAxisAxiscik000276463_ServiceMemberColumndei_LegalEntityAxisAxiscik000276463_S000004072MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*RowprimaryElement*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to OperatingExpensesData.No authoritative reference available.falsefalse13false0rr_ExpenseExampleHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00 <div class="MetaData"> <p align="left"><font style="font-size: 11pt;" class="_mt"><b>Example:</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringHeading for Expense Example.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse14false0rr_ExpenseExampleNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">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:</font></p></div> </div>falsefalsefalsefalsefalseOtherus-t ypes:textBlockItemTypestringThe Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection example falsefalse15false0rr_ExpenseExampleWithRedemptionTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockHighIncomeFundService row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_ServiceMember column dei_LegalEntityAxis compact cik000276463_S000004072Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockHighIncomeFundService row period compact * row primary compact * column dei_DocumentInformationDocume ntAxis compact cik000276463_ServiceMember column dei_LegalEntityAxis compact cik000276463_S000004072Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>truehttp://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockHighIncomeFundServicefalsefalse001132 - Schedule - Expense Example {Transposed} - BlackRock High Income Fund (Service)truefalsefalse1falseColumnperiodPeriod*ColumnprimaryElement*5false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalse true262262falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*6fals e0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue502502falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$3falseColumnperiodPeriod*ColumnprimaryElement*7fa lse0rr_ExpenseExampleYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue866866falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$4falseColumnperiodPeriod*ColumnprimaryElement*8fa lse0rr_ExpenseExampleYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue18891889falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$1falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_ServiceMemberRowdei_LegalEntityAxisAxiscik000276463_S000004 072MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalseServicedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_ServiceMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor C1 Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011394Memberrr_ProspectusShareClassAxisexplicitMemberServiceBlackRock High Income FundInvestor C1 SharesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse 1truefalsetrue262262falsefalsefalsetruefalse2truefalsetrue502502falsefalsefalsetruefalse3truefalsetrue866866falsefalsefalsetruefalse4truefalsetrue18891889falsefalsefalsetruefalseOthernanafalsefalse41Expense Example - BlackRock High Income Fund (Service) (USD $)UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*Rowdei_DocumentInformationDocumentAxisAxiscik000276463_ServiceMemberRowdei_LegalEntityAxisAxiscik000276463_S000004072MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to ExpenseExample.No authoritative reference available.falsefalseExpense Example, With Redemption [Table]16false0rr_ExpenseExampleNoRedemptionByYearCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">You would pay the following expenses if you did not redeem your shares:</font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalse17false0rr_ExpenseExampleNoRedemptionTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleNoRedemptionTransposedBlackrockHighIncomeFundService row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_ServiceMember column dei_LegalEntityAxis compact cik000276463_S000004072Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleNoRedemptionTransposedBlackrockHighIncomeFundService row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_ServiceMember column dei_LegalEntityAxis compact cik000276463_S000004072Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>truehttp://www.blackrock.com/role/ScheduleExpenseExampleNoRedemptionTransposedBlackrockHighIncomeFundServicefalsefalse001136 - Schedule - Expense Example, No Redemption {Transposed} - BlackRock High Income Fund (Service)truefalsefalse1falseColumnperiodPeriod*ColumnprimaryElement*5false0rr_ExpenseExampleNoRedemptionYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue162162falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*6fals e0rr_ExpenseExampleNoRedemptionYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue502502falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph 1 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$3falseColumnperiodPeriod*ColumnprimaryElement*7fa lse0rr_ExpenseExampleNoRedemptionYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue866866falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subparagraph f -Subsection instructions falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$4falseColumnperiodPeriod*ColumnprimaryElement*8fa lse0rr_ExpenseExampleNoRedemptionYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue18891889falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subparagraph f -Subsection instructions falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$1falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_ServiceMemberRowdei_LegalEntityAxisAxiscik000276463_S000004 072MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalseServicedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_ServiceMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor C1 Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011394Memberrr_ProspectusShareClassAxisexplicitMemberServiceBlackRock High Income FundInvestor C1 SharesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse 1truefalsetrue162162falsefalsefalsetruefalse2truefalsetrue502502falsefalsefalsetruefalse3truefalsetrue866866falsefalsefalsetruefalse4truefalsetrue18891889falsefalsefalsetruefalseOthernanafalsefalse41Expense Example, No Redemption - BlackRock High Income Fund (Service) (USD $)UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*Rowdei_DocumentInformationDocumentAxisAxiscik000276463_ServiceMemberRowdei_LegalEntityAxisAxiscik000276463_S000004072MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to ExpenseExampleNoRedemption.No authoritative reference available.falsefals e18false0rr_PortfolioTurnoverHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 11pt;" class="_mt"><b>Portfolio Turnover</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 5 -Subsection instructions falsefalse19false0rr_PortfolioTurnoverTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was&nbsp;<font class="_mt">97%</font> of the average value of its portfolio.</font></p></div> </div>falsefalsefalsefalsefalse Otherus-types:textBlockItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subsection example falsefalse20false0rr_StrategyHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Investment Strategies of the Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industr y or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse21false0rr_StrategyNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The High Income Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font></font>Both U.S. and foreign companies and governments may issue these securities.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">Under normal circumstances, the High Income Fund invests at least 80% of its assets in bonds that are rated in the lower rating categories by at least one of the recognized rating agencies including Baa or lower by Moody's Investors Service, Inc. ("Moody's") or BBB or lower by Standard &amp; Poor's ("S&amp;P") or Fitch Ratings ("Fitch"), or in unrated securities that Fund management believes are of comparable quality. Securities rated below Baa by Moody's or below BBB by S&amp;P or Fitch are commonly known as "junk bonds." Junk bonds are high-risk investments that may cause income and principal losses for the High Income Fund. The High Income Fund may invest in fixed-income securities of any duration or maturity. The High Income Fund may also invest up to 15% of its net assets in secondary market purchases of corporate loans.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The High Income Fund will invest most of its assets in securities issued by U.S. issuers, but may also invest a portion of its assets in securities issued by foreign issuers. The Fund may also invest in derivative securities for hedging purposes or to increase the return on its investments.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by i dentifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse22false0rr_RiskHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Risks of Investing in the Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNarrative Risk Disclosure.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subsection b falsefalse23false0rr_RiskNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time.&nbsp;<font class="_mt">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.</font> The following is a summary description of certain risks of investing in the Fund.</font></p> <ul> <li><font style="font-size: 10pt;" class="_mt"><b><i>Corporate Loans Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Commercial banks and other financial institutions or institutional investors make corporate loans to companies that need capital to grow or restructure. Borrowers generally pay interest on corporate loans at rates that change in response to changes in market interest rates such as the London Interbank Offered Rate ("LIBOR") or the prime rates of U.S. banks. As a result, the value of corporate loan investments is generally less exposed to the adverse effects of shifts in market interest rates than investments that pay a fixed rate of interest.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Credit Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Credit risk refers to the possibility that the issuer of a security will not be able to make payments of interest and principal when due. Changes in an issuer's credit rating or the market's perception of an issuer's creditworthiness may also affect the value of the Fund's investment in that issuer.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Derivatives Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund's use of derivatives may reduce the Fund's returns and/or increase volatility. Volatility is defined as the characteristic of a security, an index or a market to fluctuate significantly in price within a short time period. Derivatives are also subject to counterparty risk, which is the risk that the other party in the transaction will not fulfill its contractual obligation. A risk of the Fund's use of derivatives is that the fluctuations in their values may not correlate perfectly with the overall securities markets. The possible lack of a liquid secondary market for derivatives and the resulting inability of the Fund to sell or otherwise close a derivatives position could expose the Fund to losses and could make derivatives more difficult for the Fund to value accurately. Derivatives may give rise to a form of lev erage and may expose the Fund to greater risk and increase its costs.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Extension Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates rise, certain obligations will be paid off by the obligor more slowly than anticipated, causing the value of these securities to fall.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Foreign Securities Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include:<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Changes in foreign currency exchange rates can affect the value of the Fund's portfolio.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position. <br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Settlement and clearance procedures in certain foreign markets may result in delays in payment for or delivery of securities not typically associated with settlement and clearance of U.S. investments.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Interest Rate Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Interest rate risk is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall, and decrease as interest rates rise.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Junk Bonds Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Although junk bonds generally pay higher rates of interest than investment grade bonds, junk bonds are high risk investments that may cause income and principal losses for the Fund.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Market Risk and Selection Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Prepayment Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates fall, certain obligations will be paid off by the obligor more quickly than originally anticipated, and the Fund may have to invest the proceeds in securities with lower yields.<br /><br /></font></li></ul></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringNarrative Risk Disclosure. A Fund may, in responding to thi s Item, describe the types of investors for whom the Fund is intended or the types of investment goals that may be consistent with an investment in the Fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph i -Clause instruction -Subsection b falsefalse24false0rr_BarChartAndPerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><i><strong>Performance Information</strong></i></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse25false0rr_PerformanceNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsef alse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font></font>The table compares the Fund's performance to that of the Barclays Capital U.S. Corporate High Yield 2% Issuer Capped Index.&nbsp;<font class="_mt">As with all such investments, past performance (before and after taxes) is not an indication of future results.</font>&nbsp;<font class="_mt">Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.</font>&nbsp;<font class="_mt">However, the table includes all applicable fees and sales charges.</font> If the Fund's investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund's returns would have been low er. Updated information on the Fund's performance can be obtained by visiting&nbsp;<font class="_mt">http://www.blackrock.com/funds</font> or can be obtained by phone at <font class="_mt">800-882-0052</font>.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse26false0rr_BarChartHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="center"><font style="font-size: 11pt;" class="_mt"><b>Investor C1 Shares<br />ANNUAL TOTAL RETURNS<br />BlackRock High Income Fund<br />As of 12/31</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse27false0rr_BarChartTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualTotalReturnsBarChartBlackrockHighIncomeFundService column period compact * column primary compact * row dei_DocumentInformationDocumentAxis compact cik000276463_ServiceMember row dei_LegalEntityAxis compact cik000276463_S000004072Member row rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsefalseBarChart2.jpg<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualTotalReturnsBarChartBlackrockHighIncomeFundService column period compact * column primary compact * row dei_DocumentInformationDocume ntAxis compact cik000276463_ServiceMember row dei_LegalEntityAxis compact cik000276463_S000004072Member row rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsehttp://www.blackrock.com/role/ScheduleAnnualTotalReturnsBarChartBlackrockHighIncomeFundServicefalsefalse001140 - Schedule - Annual Total Returns (Bar Chart) - BlackRock High Income Fund (Service)truefalsefalse1falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*5false0rr_AnnualReturn2001rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.0083-0.0083falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective da te of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*6false0rr_AnnualReturn2002rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.0337-0.0337falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$3falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*7false0rr_AnnualReturn2003rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.31340.3134falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. T he Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$4falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*8false0rr_AnnualReturn2004rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.11020.1102falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. T he Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$5falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*9false0rr_AnnualReturn2005rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.00540.0054falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. T he Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$6falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*10false0rr_AnnualReturn2006rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.11710.1171falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$7falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*11false0rr_AnnualReturn2007rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.0120.012falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. Th e Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$8falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*12false0rr_AnnualReturn2008rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.3243-0.3243falsefalsefalsetruefalse< /hasScenarios>Otherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes . The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$9falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*13false0rr_AnnualReturn2009rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.55320.5532falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$10falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*14false0rr_AnnualReturn2010rrfalsenaduration No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.17990.1799falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$1falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_ServiceMemberRowdei_LegalEntityAxisAxiscik000276463_S000004072MemberRowrr_ProspectusShareClassAxisAxis*falsefalseServicedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_ServiceMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor C1 Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C0000 11394Memberrr_ProspectusShareClassAxisexplicitMemberServiceBlackRock High Income FundInvestor C1 Shares0truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.0083-0.0083falsefalsefalsetruefalse2truetruefalse-0.0337-0.0337falsefalsefalsetruefalse3truetruefalse0.31340.3134falsefalsefalsetruefalse4truetruefalse0.11020.1102falsefalsefalsetruefalse5truetruefalse0.00540.0054falsefalsefalsetruefalse6truetruefalse0.11710.1171falsefalsefalsetruefalse7truetruefalse0.0120.012falsefalsefalsetruefalse8truetruefalse-0.3243-0.3243falsefalsefalsetruefalse9truetruefalse0.55320.5532falsefalsefalsetruefalse10truetruefalse0.17990.1799falsefalsefalsetruefalseOthernanafalsefalse101Annual Total Returns (Bar Chart) - BlackRock High Income Fund (Service) UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*Rowdei_DocumentInformationDocumentAxisAxiscik000276463_S000004072MemberRowrr_ProspectusShareClassAxisAxis*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to BarChartData.No authoritative reference available.falsefalse28false0rr_BarChartClosingTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p><font style="font-size: 10pt;" class="_mt">During the ten-year period shown in the bar chart, the&nbsp;<font class="_mt">highest return</font> for a quarter was&nbsp;<font class="_mt">20.19%</font> (quarter ended June 30, 2009) and the&nbsp;<font class="_mt">lowest return</font> for a quarter was&nbsp;<font class="_mt">-23.67%</font> (quarter ended December 31, 2008).</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse29false0rr_PerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="text-indent: 0in; margin: 0in 0in 0pt;" class="MsoNormal"><b><font style="font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">As of 12/31/10<br />Average Annual Total Returns</font></b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringThis item represents Average Anuual Total Returns. If a Multiple Class Fund offers a Class in the prospectus that converts into another Class after a stated period, compute average annual total returns in the table by using the returns of the other Class for the perio d after conversion.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit c -Subsection b falsefalse30false0rr_PerformanceTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAverageAnnualTotalReturnsTransposedBlackrockHighIncomeFundService row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_ServiceMember column dei_LegalEntityAxis compact cik000276463_S000004072Member column rr_ProspectusShareClassAxis compact * column rr_PerformanceMeasureAxis compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAverageAnnualTotalReturnsTransposedBlackrockHighIncomeFundService row period compact * row primary compact * c olumn dei_DocumentInformationDocumentAxis compact cik000276463_ServiceMember column dei_LegalEntityAxis compact cik000276463_S000004072Member column rr_ProspectusShareClassAxis compact * column rr_PerformanceMeasureAxis compact * ~&lt;/div&gt; </div>truehttp://www.blackrock.com/role/ScheduleAverageAnnualTotalReturnsTransposedBlackrockHighIncomeFundServicefalsefalse001144 - Schedule - Average Annual Total Returns {Transposed} - BlackRock High Income Fund (Service)truefalsefalse1falseColumnperiodPeriod*ColumnprimaryElement*5false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.16990.1699falsefalsefalsetruefalse2truetruetrue0.14080.1408falsefalsefalsetruefalse3truetruetrue0.1090.109falsefalsefalsetruefalse4truetruetrue0.14940.1494falsefalsefalsetruefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*6fals e0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.06960.0696falsefalsefalsetruefalse2truetruetrue0.04150.0415falsefalsefalsetruefalse3truetruetrue0.04210.0421falsefalsefalsetruefalse4truetruetrue0.0890.089falsefalsefalsetruefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$3falseColumnperiodPeriod*ColumnprimaryElement*7fa lse0rr_AverageAnnualReturnYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.070.07falsefalsefalsetruefalse2truetruetrue0.04020.0402falsefalsefalsetruefalse3truetruetrue0.04110.0411falsefalsefalsetruefalse4truetruetrue0.09010.0901falsefalsefalsetruefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$1falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_ServiceMemberRowdei_LegalEntityAxisAxiscik000276463_S000004 072MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalseServicedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_ServiceMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor C1 Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011394Memberrr_ProspectusShareClassAxisexplicitMembertruefalseBefore Taxesrr_PerformanceMeasureAxisrr_PerformanceMeasureDomainrr_PerformanceMeasureAxisexplicitMemberServiceBlackRock High Income FundInvestor C1 SharesBefore TaxesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.16990.1699falsefalsefalsetruefalse2truetruetrue0.06960.0696falsefalsefalsetruefalse3truetruetrue0.070.07falsefalsefalsetruefalseOthernanafalsefalse2falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_ServiceMemberRowdei_LegalEntityAxisAxiscik000276463_S000004072MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalseServicedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_ServiceMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberfalsefalseInvestor C1 Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011394Memberrr_ProspectusShareClassAxisexplicitMemberfalsefalseReturn After Taxes on Distributionsrr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldirr_AfterTaxesOnDistributionsMemberrr_PerformanceMeasureAxisexplicitMemberServiceBlackRock High Income FundInvestor C1 SharesReturn After Taxes on DistributionsStandard00truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.14080.1408falsefalsefalsetruefalse2truetruetrue0.04150.0415falsefalsefalsetruefalse3truetruetrue0.04020.0402falsefalsefalsetruefalseOthernanafalsefa lse3falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_ServiceMemberRowdei_LegalEntityAxisAxiscik000276463_S000004072MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnitCompact*falsefalseServicedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_ServiceMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMemberfalsefalse< /IsFromEntityGroup>Investor C1 Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000011394Memberrr_ProspectusShareClassAxisexplicitMemberfalsefalseReturn After Taxes on Distributions and Sale of Sharesrr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldirr_AfterTaxesOnDistributionsAndSalesMemberrr_PerformanceMeasureAxisexplicitMemberServiceBlackRock High Income FundInvestor C1 SharesReturn After Taxes on Distributions and Sale of SharesStandard00truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.1090.109falsefalsefalsetruefalse2truetruetrue0.04210.0421falsefalsefalsetruefalse3truetruetrue0.04110.0411falsefalsefalsetruefalseOthernanafalsefalse4falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_ServiceMemberRowdei_LegalEntityAxisAxiscik000276463_S000004072MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUn it*falsefalseServicedei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_ServiceMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock High Income Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004072Memberdei_LegalEntityAxisexplicitMembertruefalseShare Classesrr_ProspectusShareClassAxisrr_ShareClassDomainrr_ProspectusShareClassAxisexplicitMemberfalsefalseBarclays Capital U.S. Corporate High Yield 2% Issuer Capped Index (Reflects no deduction for fees, expenses or taxes)rr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_BarclaysCapitalUSCorporateHighYield2IssuerCappedIndexMemberrr_PerformanceMeasureAxisexplicitMemberServiceBlackRock High Income FundShare ClassesBarclays Capital U.S. Corpo rate High Yield 2% Issuer Capped Index (Reflects no deduction for fees, expenses or taxes)Standard00truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.14940.1494falsefalsefalsetruefalse2truetruetrue0.0890.089falsefalsefalsetruefalse3truetruetrue0.09010.0901falsefalsefalsetruefalseOthernanafalsefalse34Average Annual Total Returns - BlackRock High Income Fund (Service) Service BlackRock High Income FundUnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*Rowdei_DocumentInformationDocumentAxisAxiscik000276463_ServiceMemberRowdei_LegalEntityA xisAxiscik000276463_S000004072MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer f or the role corresponding to PerformanceTableData.No authoritative reference available.falsefalse31false0rr_PerformanceTableNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. </font></font><font class="_mt">Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.</font></font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIf the Fund has annual returns for at least one calendar year, provide a table showing the Fund's (A) average annual total return; (B) average annual total return (after taxes on distributions); and (C) average annual total return (after taxes on distributions and redemption). A Money Market Fund should show only the returns described in clause (A) of the preceding sentence. All returns should be shown for 1-, 5-, and 10- calendar year periods ending on the date of the most recently completed calendar year (or for the life of the Fund, if shorter), but only for periods subsequent to the effective date of the Fund's registration statement. The table also shouldshow the returns of an appropriate broadbased securities market index as defined in Instruction 5 to Item 22(b)(7) for the same periods. A Fund that has been in existence for more than 10 years also may include returns for the life of the Fund. A Money Market Fund may provide the Fund's 7-day yield ending on the date of the most recent calendar year or disclose a toll-free (or collect) telephone number that investors can use to obtain the Fund's current 7-day yield. For a Fund (other than a Money Market Fund or a Fund described in General Instruction C.3.(d)(iii)), provide the information in the following table with the specified captions AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, _____). 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Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse5false0rr_ObjectivePrimaryTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The investment objective of the BlackRock Total Return Fund (the "Fund") is to realize a total return that exceeds that of the Barclays Capital U.S. Aggregate Bond Index.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse6false0rr_ExpenseHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><i><strong>Fees and Expenses of the Fund</strong></i></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Fee Table Includes the following information, in plain English under rule 421(d) under the Securities Act, after Item 2 Fees and expenses of the Fund This table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agr ee to invest in the future, at least $[_____] in [name of fund family] funds. Shareholder Fees (fees paid directly from your investment) 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 you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be You would pay the following expenses if you did not redeem your shares The Example does not reflect sales charges (loads) on reinvested dividends [and other distributions]. If these sales charges (loads) were included, your costs would be higher. Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns ov er" its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was __% of the average value of its whole portfolio. Instructions. A.3.instructions.6 New Funds. For purposes of this Item, a "New Fund" is a Fund that does not include in Form N-1A financial statements reporting operating results or that includes financial statements for the Fund's initial fiscal year reporting operating results for a period of 6 months or less. The following Instructions apply to New Funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph d -Subsection instructions falsefalse7false0rr_ExpenseNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">This table describes the fees and expenses that you may pay if you buy and hold BlackRock Shares of the Fund.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThis table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $[_____] in [name of fund family] funds. Include the narrative explanations in th e order indicated. A Fund may modify the narrative explanations if the explanation contains comparable information to that shown.The narrative explanation regarding sales charge discounts is only required by a Fund that offers such discounts and should specify the minimum level of investment required to qualify for a discount. Modify the narrative explanation to state that Fund shares are sold on a national securities exchange at the end of the time periods indicated, and that brokerage commissions for buying and selling Fund shares through a broker are not reflected.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph b -Subsection instructions falsefalse8false0rr_ShareholderFeesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="line-height: normal; margin: 0in 0in 0pt; font-family: 'Calibri','sans-serif'; font-size: 11pt;" class="MsoNormal"><b><font style="font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">Shareholder Fees <br />(fees paid directly from your investment)</font></b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringShareholder Fees (fees paid directly from your investment).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subsection table falsefalse9false0rr_ShareholderFeesTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleShareholderFeesBlackrockTotalReturnFundBlackrock column period compact * column dei_DocumentInformationDocumentAxis compact cik000276463_BlackrockMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleShareholderFeesBlackrockTotalReturnFundBlackrock column period compact * column dei_DocumentInformationDocumentAxis compact cik000276463_BlackrockMember col umn dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div>falsehttp://www.blackrock.com/role/ScheduleShareholderFeesBlackrockTotalReturnFundBlackrockfalsefalse001158 - Schedule - Shareholder Fees - BlackRock Total Return Fund (Blackrock)truefalsefalse1falseColumnperiodPeriod*Columndei_DocumentInformationDo cumentAxisAxiscik000276463_BlackrockMemberColumndei_LegalEntityAxisAxiscik000276463_S000004071MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseBlackRockdei_DocumentInformationDocument Axisxbrldihttp://xbrl.org/2006/xbrldicik000276463_BlackrockMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseBlackRockrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000052631Memberrr_ProspectusSh areClassAxisexplicitMemberBlackRockBlackRock Total Return FundBlackRockUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$ 1falseRowprimaryElement*5false0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charg e (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales ch arge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalse0rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPricetruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsetruefalseOthernanafalsefalse2falseRowprimaryElement*6false0rr_MaximumDeferredSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureMaximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales char ges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph a -Clause i -Subsection instructions falsefalse0rr_MaximumDeferredSalesChargeOverOfferingPricetruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsetruefalseOthernanafalsefalse12Shareholder Fees - BlackRock Total Return Fund (Blackrock) UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*Columndei_DocumentInformationDocumentAxisAxiscik000276463_BlackrockMemberColumndei_LegalEntityAxisAxiscik000276463_S000004071MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*RowprimaryElement*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to ShareholderFeesData.No authoritative reference available.falsefalse10false0rr_OperatingExpensesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"><strong><font size="2" class="_mt">Annual Fund Operating Expenses<br />(expenses that you pay each year as a percentage of the value of your investment)</font></strong></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringAnnual Fund Operating Expenses (ongoing expenses that you pay each year as a percentage of the value of your investment)Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 7 -Subsection table falsefalse11false0rr_AnnualFundOperatingExpensesTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualFundOperatingExpensesBlackrockTotalReturnFundBlackrock column period compact * column dei_DocumentInformationDocumentAxis compact cik000276463_BlackrockMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualFundOperatingExpensesBlackrockTotalReturnFundBlackrock column period compact * column dei_DocumentInformationDocumentAxis c ompact cik000276463_BlackrockMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt; </div>falsehttp://www.blackrock.com/role/ScheduleAnnualFundOperatingExpensesBlackrockTotalReturnFundBlackrockfalsefalse001166 - Schedule - Annual Fund Operating Expenses - BlackRock Total Return Fund (Blackrock)truefalsefalse1falseColumnperiodPeriod*Columndei_DocumentInformationDocumentAxisAxiscik000276463_BlackrockMemberColumndei_LegalEntityAxisAxiscik000276463_S000004071MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*duration2011-01-28T00:00:002011-01-28T00:00:00falsefalseBlackRockdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_BlackrockMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseBlackRockrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldi< Id>cik000276463_C000052631Memberrr_ProspectusShareClassAxisexplicitMemberBlackRockBlackRock Total Return FundBlackRockUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalse false$1falseRowprimaryElement*5false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00440.0044[1],[2]falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fee s (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse0rr_ManagementFeesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[1][2]1truetruetrue0.00440.0044< NonNumbericText />falsefalsefalsetruefalseOthernanafalsefalse2falseRowprimaryElement*6false0rr_DistributionAndService12b1FeesOverAssetsrrfa lsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00[2]falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalse0rr_DistributionAndService12b1FeesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[2]1truetruetrue00falsefalsefalsetruefalseOthernanafalsefalse3falseRowprimaryElement*7false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truetruetrue0.00550.0055[2]falsefalsefalsetruefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," dis close in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions truefalse0rr_OtherExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[2]1truetruetrue0.00550.0055falsefalsefalsetruefalseOthernanafalsefalse4falseRowprimaryElement*8false0rr_Component1OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00460.0046[2]falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse0rr_Component1OtherExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[2]1truetruetrue0.00460.0046falsefalsefalsetruefalseOthernanafalsefalse5falseRowprimaryElement*10false0rr_Component3OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00090.0009[2]falsefalse< DisplayDateInUSFormat>falsetruefalseOtherrr:NonNegativePure4TypepureThe Fund may subdivide this caption into no more than three subcaptions that identify the largest expense or expenses comprising "Other Expenses," but must include a total of all "Other Expenses." Alternatively, the Fund may include the components of "Other Expenses" in a parenthetical to the caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause iii -Subsection instructions falsefalse0rr_Component3OtherExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[2]1truetruetrue0.00090.0009falsefalsefalsetruefalseOthernanafalsefalse6falseRowprimaryElement*11false0rr_ExpensesOverAssetsrrfalsen adurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truetruetrue0.00990.0099[2]falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver a rrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions truefalse0rr_ExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[2]1truetruetrue0.00990.0099falsefalsefalsetruefalseOthernanafalsefalse7falseRowprimaryElement*12false0rr_FeeWaiverOrReimbursementOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue-0.0013-0.0013[1],[2]falsefalsefalsetruefalseOtherrr:NonPositivePure4TypepureTotal Annual Fund Operating Expenses. If there were expense reimbursement or fee waiver arrangements that reduced any Fund operating expenses and will continue to reduce them for no less than one year from the effective date of the Fund's registration statement, a Fund may add two captions to the table one caption showing the amount of the expense reimbursement or fee waiver, and a second caption showing the Fund's net expenses after subtracting the fee reimbursement or expense waiver from the total fund operating expenses. The Fund should place these additional captions directly below the "Total Annual Fund Operating Expenses" caption of the table and should use appropriate descriptive captions, such as "Fee Waiver [and/or Expense Reimbursement]" and "Total Annual Fund Operating Expenses After Fee Waiver [and/or Expense Reimbursement]," respectively. If the Fund provides this disclosure, also disclose the period for which the expense reimbursement or fee waiver arrangement is expected to continue, and briefly describe who can terminate the arrangement and under what circumstances.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse0rr_FeeWaiverOrReimbursementOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[1][2]1truetruetrue-0.0013-0.0013falsefalsefalsetruefalseOthernanafalsefalse8falseRowprimaryElement*13false0rr_NetExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truetruetrue0.00860.0086[2]fal sefalsefalsetruefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table truefalse0rr_NetExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[2]1truetruetrue0.00860.0086falsefalsefalsetruefalseOthernanafalsefalse1As described in the "Management of the Fund" section of the Fund's prospectus on page 23, BlackRock has contractually agreed to waive the Total Return Fund's management fee in the amount of the Total Return Fund's share of the management fee paid by the Master Portfolio for as long as the Total Retur n Fund invests in the Master Portfolio. In addition, BlackRock has contractually agreed to waive and/or reimburse fees and/or expenses in order to limit Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements (excluding Dividend Expense, Interest Expense, Acquired Fund Fees and Expenses and certain other Fund expenses) to 0.40% of average daily net assets until February 1, 2012. These contractual agreements may be terminated upon 90 days notice by a majority of the non-interested directors of the Fund or by a vote of a majority of the outstanding voting securities of the Fund.2The fees and expenses shown in the table and the example that follows include both the expenses of the Fund and the Fund's share of the allocated expenses of Master Total Return Portfolio (the "Portfolio").18Annual Fund Operating Expenses - BlackRock Total Re turn Fund (Blackrock) UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*Columndei_DocumentInformationDocumentAxisAxiscik000276463_BlackrockMemberColumndei_LegalEntityAxisAxiscik000276463_S000004071MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*RowprimaryElement*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to OperatingExpensesData.No authoritative reference available.falsefalse 12false0rr_ExpenseExampleHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;"><font style="font-size: 11pt;" class="_mt"><b>Example:</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringHeading for Expense Example.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse13false0rr_ExpenseExampleNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p style="margin-top: 0px; margin-bottom: 0px;" align="left"><font style="font-size: 10pt;" class="_mt">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:</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThe Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection example falsefalse14false0rr_ExpenseExampleWithRedemptionTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockTotalReturnFundBlackrock row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_BlackrockMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockTotalReturnFundBlackrock row period compact * row primary compact * column dei_DocumentInformati onDocumentAxis compact cik000276463_BlackrockMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>truehttp://www.blackrock.com/role/ScheduleExpenseExampleTransposedBlackrockTotalReturnFundBlackrockfalsefalse001174 - Schedule - Expense Example {Transposed} - BlackRock Total Return Fund (Blackrock)truefalsefalse1falseColumnperiodPeriod*Co lumnprimaryElement*5false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue8888falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower. Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*6fals e0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue287287falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$3falseColumnperiodPeriod*ColumnprimaryElement*7fa lse0rr_ExpenseExampleYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue503503falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$4falseColumnperiodPeriod*ColumnprimaryElement*8fa lse0rr_ExpenseExampleYear10rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsetrue11261126falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$1falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_BlackrockMemberRowdei_LegalEntityAxisAxiscik000276463_S0000 04071MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalseBlackRockdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_BlackrockMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAx isxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseBlackRockrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000052631Memberrr_ProspectusShareClassAxisexplicitMemberBlackRockBlackRock Total Return FundBlackRockUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue8888falsefalsefalsetruefalse2truefalsetrue287287falsefalsefalsetruefalse3truefalsetrue503503falsefalsefalsetruefalse4truefalsetrue11261126falsefalsefalsetruefalseOthernanafalsefalse41Expense Example - BlackRock Total Return Fund (Blackrock) (USD $)UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*Rowdei_DocumentInformationDocumentAxisAxiscik000276463_BlackrockMemberRowdei_LegalEntityAxisAxiscik000276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to ExpenseExample.No authoritative reference available.falsefalse< Label>Expense Example, With Redemption [Table]15false0rr_PortfolioTurnoverHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 11pt;" class="_mt"><b>Portfolio Turnover</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 5 -Subsection instructions falsefalse16false0rr_PortfolioTurnoverTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was&nbsp;<font class="_mt">1,754%</font> of the average value of its portfolio.</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subsection example falsefalse17false0rr_StrategyHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse 00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Investment Strategies of the Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industr y or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse18false0rr_StrategyNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The Fund typically invests more than 90% of its assets in a diversified portfolio of fixed-income securities such as corporate bonds and notes, mortgage-backed securities, asset-backed securities, convertible securities, preferred securities and government obligations. </font></font>Both U.S. and foreign companies and governments may issue these securities.&nbsp;<font class="_mt">Under normal circumstances, the Fund invests at least 80% of its assets in bonds and invests primarily in investment grade fixed-income securities.</font> The Fund may invest in fixed-income securities of any duration or maturity.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund will invest most of its assets in securities issued by U.S. issuers, but may also invest a portion of its assets in securities issued by foreign issuers. The Fund may also invest in derivative securities for hedging purposes or to increase the return on its investments. The Fund may also enter into dollar rolls.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Total Return Fund may invest up to 20% of its net assets in fixed-income securities that are rated below investment grade by at least one of the recognized rating agencies or in unrated securities of equivalent credit quality.</font></p> <p align="left"><font style="font-size: 10pt;" class="_mt">The Fund is a "feeder" fund that invests all of its assets in a corresponding "master" portfolio, the Master Total Return Portfolio (the "Master Portfolio"), a series of the Master Bond LLC (the "Master LLC"), a mutual fund that has the same investment objectives and strategies as the Fund. All investments will be made at the level of the Master Portfolio. This structure is sometimes called a "master/feeder" structure. The Fund's investment results will correspond directly to the investment results of the underlying Master Portfolio in which it invests. For simplicity, this Prospectus uses the term "Fund" to include the Master Portfolio.</font></p></div> </div>falsefalsefalsef alsefalseOtherus-types:textBlockItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse19false0rr_RiskHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><b><i>Principal Risks of Investing in the Fund</i></b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNarrative Risk Disclosure.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subsection b falsefalse20false0rr_RiskNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time.&nbsp;<font class="_mt">You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.</font> The following is a summary description of certain risks of investing in the Fund.</font></p> <ul> <li><font style="font-size: 10pt;" class="_mt"><b><i>Credit Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Credit risk refers to the possibility that the issuer of a security will not be able to make payments of interest and principal when due. Changes in an issuer's credit rating or the market's perception of an issuer's creditworthiness may also affect the value of the Fund's investment in that issuer.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Derivatives Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund's use of derivatives may reduce the Fund's returns and/or increase volatility. Volatility is defined as the characteristic of a security, an index or a market to fluctuate significantly in price within a short time period. Derivatives are also subject to counterparty risk, which is the risk that the other party in the transaction will not fulfill its contractual obligation. A risk of the Fund's use of derivatives is that the fluctuations in their values may not correlate perfectly with the overall securities markets. The possible lack of a liquid secondary market for derivatives and the resulting inability of the Fund to sell or otherwise close a derivatives position could expose the Fund to losses and could make derivatives more difficult for the Fund to value accurately. Derivatives may give rise to a form of lev erage and may expose the Fund to greater risk and increase its costs.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Dollar Rolls Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Dollar rolls involve the risk that the market value of the securities that the Fund is committed to buy may decline below the price of the securities the Fund has sold. These transactions may involve leverage.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Extension Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates rise, certain obligations will be paid off by the obligor more slowly than anticipated, causing the value of these securities to fall.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>High Portfolio Turnover Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; The Fund may engage in active and frequent trading of its portfolio securities. High portfolio turnover (more than 100%) may result in increased transaction costs to the Fund, including brokerage commissions, dealer mark-ups and other transaction costs on the sale of the securities and on reinvestment in other securities. The sale of Fund portfolio securities may result in the realization and/or distribution to shareholders of higher capital gains or losses as compared to a fund with less active trading policies. Given the frequency of sales, such gain or loss will likely be short-term capital gain or loss and, in the event of a gain, would increase an investor's tax liability unless shares are held through a tax-deferred or exempt vehicle. These effects of higher than normal portfolio turnover may adversely aff ect Fund performance. In addition, investment in mortgage dollar rolls and participation in TBA transactions may significantly increase the Fund's portfolio turnover rate. A TBA transaction is a method of trading mortgage-backed securities where the buyer and seller agree upon general trade parameters such as agency, settlement date, par amount, and price.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Interest Rate Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Interest rate risk is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall, and decrease as interest rates rise.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Foreign Securities Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212;Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include:<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Changes in foreign currency exchange rates can affect the value of the Fund's portfolio.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt">&nbsp;&nbsp;Settlement and clearance procedures in certain foreign markets may result in delays in payment for or delivery of securities not typically associated with settlement and clearance of U.S. investments.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Junk Bonds Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Although junk bonds generally pay higher rates of interest than investment grade bonds, junk bonds are high risk investments that may cause income and principal losses for the Fund.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Market Risk and Selection Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Mortgage- and Asset-Backed Securities Risks</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Mortgage- and asset-backed securities represent interests in "pools" of mortgages or other assets, including consumer loans or receivables held in trust. Mortgage- and asset-backed securities are subject to credit, interest rate, prepayment and extension risks. These securities also are subject to risk of default on the underlying mortgage or asset, particularly during periods of economic downturn. Small movements in interest rates (both increases and decreases) may quickly and significantly reduce the value of certain mortgage-backed securities.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Prepayment Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; When interest rates fall, certain obligations will be paid off by the obligor more quickly than originally anticipated, and the Fund may have to invest the proceeds in securities with lower yields.<br /><br /></font></li> <li><font style="font-size: 10pt;" class="_mt"><b><i>Sovereign Debt Risk</i></b></font><font style="font-size: 10pt;" class="_mt"> &#8212; Sovereign debt instruments are subject to the risk that a governmental entity may delay or refuse to pay interest or repay principal on its sovereign debt, due, for example, to cash flow problems, insufficient foreign currency reserves, political considerations, the relative size of the governmental entity's debt position in relation to the economy or the failure to put in place economic reforms required by the International Monetary Fund or other multilateral agencies.<br /><br /></font></li></ul></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringNarrative Risk Disclosure. A Fund may, in responding to this Item, describe the types of investors for whom the Fund is intended or the types of investment goals that may be consistent with an investment in the Fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph i -Clause instruction -Subsection b falsefalse21false0rr_BarChartAndPerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="left"><font style="font-size: 12pt;" class="_mt"><i><strong>Performance Information</strong></i></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse22false0rr_PerformanceNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsef alse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. </font></font>The table compares the Fund's performance to that of the Barclays Capital U.S. Aggregate Bond Index. Effective September 24, 2007, the Total Return Fund reorganized with BlackRock Total Return Portfolio (the "Predecessor Fund"), a series of BlackRock Funds II (the "Reorganization"), and the Predecessor Fund's performance and financial history has been adopted by the Total Return Fund and will be used going forward from the date of the Reorganization. The information below is based on the performance information of the combined fund resulting from the Reorganization and that of the Predecessor Fund prior to the Reorganization. Prior the September 24, 2007, BlackRock Share performance results are thos e of BlackRock Shares of the Predecessor Fund with no adjustments.&nbsp;<font class="_mt">As with all such investments, past performance (before and after taxes) is not an indication of future results.</font>&nbsp;<font class="_mt">Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.</font>&nbsp;<font class="_mt">However, the table includes all applicable fees and sales charges.</font> If the Fund's investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund's returns would have been lower. Updated information on the Fund's performance can be obtained by visiting&nbsp;<font class="_mt">http://www.blackrock.com/funds</font> or can be obtained by phone at&nbsp;<font class="_mt">800-882-0052.</font> </font></p></div> </div>< CurrencySymbol />falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse23false0rr_BarChartHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p align="center"><font style="font-size: 11pt;" class="_mt"><b>BlackRock Shares<br />ANNUAL TOTAL RETURNS<br />BlackRock Total Return Fund<br />As of 12/31</b></font></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse24false0rr_BarChartTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualTotalReturnsBarChartBlackrockTotalReturnFundBlackrock column period compact * column primary compact * row dei_DocumentInformationDocumentAxis compact cik000276463_BlackrockMember row dei_LegalEntityAxis compact cik000276463_S000004071Member row rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsefalseBarChart5.jpg<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAnnualTotalReturnsBarChartBlackrockTotalReturnFundBlackrock column period compact * column primary compact * row dei_DocumentInformati onDocumentAxis compact cik000276463_BlackrockMember row dei_LegalEntityAxis compact cik000276463_S000004071Member row rr_ProspectusShareClassAxis compact * ~&lt;/div&gt; </div>falsehttp://www.blackrock.com/role/ScheduleAnnualTotalReturnsBarChartBlackrockTotalReturnFundBlackrockfalsefalse001190 - Schedule - Annual Total Returns (Bar Chart) - BlackRock Total Return Fund (Blackrock)truefalsefalse1falseColumnperiodPeriod*C olumnprimaryElement*ColumnunitUnit*6false0rr_AnnualReturn2002rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.09040.0904falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to th e effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*7false0rr_AnnualReturn2003rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.0470.047falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$3falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*8false0rr_AnnualReturn2004rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.04520.0452falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. T he Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$4falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*9false0rr_AnnualReturn2005rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.02520.0252falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. T he Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$5falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*10false0rr_AnnualReturn2006rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.04250.0425falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$6falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*11false0rr_AnnualReturn2007rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.05260.0526falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$7falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*12false0rr_AnnualReturn2008rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse-0.111-0.111falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$8falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*13false0rr_AnnualReturn2009rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.16360.1636falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit a -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$9falseColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*14false0rr_AnnualReturn2010rrfalsenaduration< ShortDefinition>No definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.10140.1014falsefalsefalsetruefalseOtherxbrli:pureItemTypepureIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart. When a Multiple Class Fund offers more than one Class in the prospectus, provide annual total returns in the bar chart for only one of those Classes. The Fund can select which Class to include (e.g., the oldest Class, the Class with the greatest net assets).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$1falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_BlackrockMemberRowdei_LegalEntityAxisAxiscik000276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*falsefalseBlackRock dei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_BlackrockMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseBlackRockrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000052 631Memberrr_ProspectusShareClassAxisexplicitMemberBlackRockBlackRock Total Return FundBlackRock0truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.09040.0904falsefalsefalsetruefalse2truetruefalse0.0470.047falsefalsefalsetruefalse3truetruefalse0.04520.0452falsefalsefalsetruefalse4truetruefalse0.02520.0252falsefalsefalsetruefalse5truetruefalse0.04 250.0425falsefalsefalsetruefalse6truetruefalse0.05260.0526falsefalsefalsetruefalse7truetruefalse-0.111-0.111falsefalsefalsetruefalse8truetruefalse0.16360.1636falsefalsefalsetruefalse9truetruefalse< NumericAmount>0.10140.1014falsefalsefalsetruefalseOthernanafalsefalse91Annual Total Returns (Bar Chart) - BlackRock Total Return Fund (Blackrock) UnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*ColumnunitUnit*Rowdei_DocumentInformationDocumentAxisAxiscik000276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to BarChartData.No authoritative reference available.falsefalse25false0rr_BarChartClosingTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <div class="MetaData"> <p align="left"><font style="font-size: 10pt;" class="_mt">During the period shown in the bar chart, the&nbsp;<font class="_mt">highest return</font> for a quarter was&nbsp;<font class="_mt">7.13%</font> (quarter ended September 30, 2009) and the&nbsp;<font class="_mt">lowest return</font> for a quarter was&nbsp;<font class="_mt">-6.85%</font> (quarter ended September 30, 2008).</font></p></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIf the Fund has annual returns for at least one calendar year, provide a bar chart showing the Fund's annual total returns for each of the last 10 calendar years (or for the life of the Fund if less than 10 years), but only for periods subsequent to the effective date of the Fund's registration statement. Present the corresponding numerical return adjacent to each bar. If the Fund's fiscal year is other than a calendar year, include the year-to-date return information as of the end of the most recent quarter in a footnote to the bar chart. Following the bar chart, disclose the Fund's highest and lowest return for a quarter during the 10 years or other period of the bar chart.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph ii -Subsection b falsefalse26false0rr_PerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div class="MetaData"> <p style="font-family: 'Times New Roman','serif'; margin-left: 0in; font-size: 12pt; margin-right: 0in;"><b><font style="font-family: 'Arial','sans-serif'; font-size: 9pt;" class="_mt">As of 12/31/10<br />Average Annual Total Returns</font></b><b><font style="font-family: 'Arial','sans-serif'; font-size: 11pt;" class="_mt"> </font></b></p></div>falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringThis item represents Average Anuual Total Returns. If a Multiple Class Fund offers a Class in the prospectus that converts into another Class after a stated period, compute average annual total returns in the table by using the returns of the other Class for the period after conversion.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 3 -Exhibit c -Subsection b falsefalse27false0rr_PerformanceTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAverageAnnualTotalReturnsTransposedBlackrockTotalReturnFundBlackrock row period compact * row primary compact * column dei_DocumentInformationDocumentAxis compact cik000276463_BlackrockMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * column rr_PerformanceMeasureAxis compact * ~&lt;/div&gt; </div>falsefalse<div> &lt;div style="display:none;" &gt;~ http://www.blackrock.com/role/ScheduleAverageAnnualTotalReturnsTransposedBlackrockTotalReturnFundBlackrock row period compact * row primary com pact * column dei_DocumentInformationDocumentAxis compact cik000276463_BlackrockMember column dei_LegalEntityAxis compact cik000276463_S000004071Member column rr_ProspectusShareClassAxis compact * column rr_PerformanceMeasureAxis compact * ~&lt;/div&gt; </div>truehttp://www.blackrock.com/role/ScheduleAverageAnnualTotalReturnsTransposedBlackrockTotalReturnFundBlackrockfalsefalse001198 - Schedule - Average Annual Total Returns {Transposed} - BlackRock Total Return Fund (Blackrock)truefalsefalse1falseColumnperiodPeriod*ColumnprimaryElement*5false0rr_AverageAnnualReturnYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.10140.1014falsefalsefalsetruefalse2truetruetrue0.08430.0843falsefalsefalsetruefalse3truetruetrue0.06560.0656falsefalsefalsetruefalse4truetruetrue0.06540.0654falsefalsefalsetruefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$2falseColumnperiodPeriod*ColumnprimaryElement*6fals e0rr_AverageAnnualReturnYear05rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.04570.0457falsefalsefalsetruefalse2truetruetrue0.0270.027falsefalsefalsetruefalse3truetruetrue0.02780.0278falsefalsefalsetruefalse4truetruetrue0.0580.058falsefalsefalsetruefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$3falseColumnperiodPeriod*ColumnprimaryElement*8fa lse0rr_AverageAnnualReturnSinceInceptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.04910.0491< CurrencyCode />falsefalsefalsetruefalse2truetruetrue0.03070.0307falsefalsefalsetruefalse3truetruetrue0.03090.0309falsefalsefalsetruefalse4truetruetrue0.05610.0561falsefalsefalsetruefalseOtherxbrli:pureItemTypepureReturn Before Taxes.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iii -Clause 1 -Exhibit 2 -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$4falseColumnperiodPeriod*ColumnprimaryElement*9false0rr_AverageAnnualReturnInceptionDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalse002001-12-07falsefalsetruetruefalse2falsetruefalse002001-12-07falsefalsetruetruefalse3falsetruefalse002001-12-07falsefalsetruetruefalse4falsetruefalse00falsefalsetruetruefalseOtherxbrli:dateItemTypedateReturn Before Taxes.< /ElementDefenition>Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 4 -Subsection b falsefalseduration2011-01-28T00:00:002011-01-28T00:00:00falseUSDfalsefalse$1falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_BlackrockMemberRowdei_LegalEntityAxisAxiscik000 276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalseBlackRockdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_BlackrockMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseBlackRockrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000052631Memberrr_ProspectusShareClassAxisexplicitMembertruefalseBefore Taxesrr_PerformanceMeasur eAxisrr_PerformanceMeasureDomainrr_PerformanceMeasureAxisexplicitMemberBlackRockBlackRock Total Return FundBlackRockBefore TaxesUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.10140.1014falsefalsefalse< hasSegments>truefalse2truetruetrue0.04570.0457falsefalsefalsetruefalse3truetruetrue0.04910.0491falsefalsefalsetruefalse4falsetruefalse002001-12-072001-12-07falsefalsetruetruefalseOthernanafalsefalse2falseRow dei_DocumentInformationDocumentAxisAxiscik000276463_BlackrockMemberRowdei_LegalEntityAxisAxiscik000276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalseBlackRockdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_BlackrockMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseBlackRockrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000052631Memberrr_ProspectusShareClassAxisexplicitMemberfalsefalseReturn After Taxes on Distributionsrr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldirr_AfterTaxesOnDistributionsMemberrr_PerformanceMeasureAxisexplicitMemberBlackRockBlackRock Total Return FundBlackRockReturn After Taxes on DistributionsStandard00truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue 0.08430.0843falsefalsefalsetruefalse2truetruetrue0.0270.027falsefalsefalsetruefalse3truetruetrue0.03070.0307falsefalsefalsetruefalse4falsetruefalse002001-12-072001-12-07falsefalsetruetruefalseOthernanafalsefalse3falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_BlackrockMemberRowdei_LegalEntityAxisAxiscik000276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnitCompact*falsefalseBlackRockdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_BlackrockMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMemberfalsefalseBlackRockrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_C000052631Memberrr_ProspectusShareClassAxisexplicitMemberfalsefalseReturn After Taxes on Distributions and Sale of Sharesrr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldirr_AfterTaxesOnDistributionsAndSalesMemberrr_PerformanceMeasureAxisexplicitMemberBlackRockBlackRock Total Return FundBlackRockReturn After Taxes on Distributions and Sale of SharesStandard00truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.06560.0656falsefalsefalsetruefalse2truetruetrue0.02780.0278falsefalsefalsetruefalse3truetruetrue0.03090.0309falsefalsefalsetruefalse4falsetruefalse002001-12-072001-12-07falsefalsetruetruefalseOthernanafalsefalse4falseRowdei_DocumentInformationDocumentAxisAxiscik000276463_BlackrockMemberRowdei_LegalEntityAxisAxiscik000276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*Rowunit Unit*falsefalseBlackRockdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_BlackrockMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseBlackRock Total Return Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_S000004071Memberdei_LegalEntityAxisexplicitMembertrue falseShare Classesrr_ProspectusShareClassAxisrr_ShareClassDomainrr_ProspectusShareClassAxisexplicitMemberfalsefalseBarclays Capital U.S. Aggregate Bond Index (Reflects no deduction for fees, expenses or taxes)rr_PerformanceMeasureAxisxbrldihttp://xbrl.org/2006/xbrldicik000276463_BarclaysCapitalUSAggregateBondIndexReflectsNoDeductionForFeesExpensesOrTaxesMemberrr_PerformanceMeasureAxisexplicitMemberBlackRockBlackRock Total Return FundShare ClassesBarclays Capital U.S. Aggregate Bond Index (Reflects no deduction for fees, expenses or taxes)Standard00truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.06540.0654falsefalsefalsetruefalse2truetruetrue0.0580.058falsefalsefalsetruefalse3truetruetrue0.05610.0561falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsefalsefalseOthernanafalsefalse44Average Annual Total Returns - BlackRock Total Return Fund (Blackrock) BlackRockUnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*ColumnprimaryElement*Rowdei_DocumentInformationDocumentAxisAxiscik000276463_BlackrockMemberRowdei_LegalEntityAxisAxiscik000276463_S000004071MemberRowrr_ProspectusShareClassAxisAxis*Rowrr_PerformanceMeasureAxisAxis*RowunitUnit*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role cor responding to PerformanceTableData.No authoritative reference available.falsefalse28false0rr_PerformanceTableNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse< Cells>1falsefalsefalse00<div> <div class="MetaData"><font style="font-size: 10pt;" class="_mt"><font class="_mt"><font style="font-size: 10pt;" class="_mt">After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. </font></font><font class="_mt">Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.</font></font></div> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringIf the Fund has annual returns for at least one calendar year, provide a table showing the Fund's (A) average annual total return; (B) average annual total return (after taxes on distributions); and (C) average annual total return (after taxes on distributions and redemption). A Money Market Fund should show only the returns described in clause (A) of the preceding sentence. All returns should be shown for 1-, 5-, and 10- calendar year periods ending on the date of the most recently completed calendar year (or for the life of the Fund, if shorter), but only for periods subsequent to the effective date of the Fund's registration state ment. The table also shouldshow the returns of an appropriate broadbased securities market index as defined in Instruction 5 to Item 22(b)(7) for the same periods. A Fund that has been in existence for more than 10 years also may include returns for the life of the Fund. A Money Market Fund may provide the Fund's 7-day yield ending on the date of the most recent calendar year or disclose a toll-free (or collect) telephone number that investors can use to obtain the Fund's current 7-day yield. For a Fund (other than a Money Market Fund or a Fund described in General Instruction C.3.(d)(iii)), provide the information in the following table with the specified captions AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, _____). For a Fund that provides annual total returns for only one calendar year or for a Fund that does not include the bar chart because it does not have annual returns for a full calendar year, modify, as appropriate, the narrative explanation required by paragraph (c)(2)(i) (e.g. , by stating that the information gives some indication of the risks of an investment in the Fund by comparing the Fund's performance with a broad measure of market performance).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph iv -Subsection b falsefalse127Risk/Return Summary - BlackRock Total Return Fund (Blackrock) (BlackRock, BlackRock Total Return Fund)UnKnownUnKnownUnKnownUnKnownfalsetrue -----END PRIVACY-ENHANCED MESSAGE-----