| Form N-CSR Cover | 12 Months Ended |
| Sep. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | BlackRock Bond Fund, Inc. |
| Entity Central Index Key | 0000276463 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Sep. 30, 2024 |
| Shareholder Report | 12 Months Ended | |
| Sep. 30, 2024 USD ($) Holding | ||
| Shareholder Report [Line Items] | ||
| Document Type | N-CSR | |
| Amendment Flag | false | |
| Registrant Name | BlackRock Bond Fund, Inc. | |
| Entity Central Index Key | 0000276463 | |
| Entity Investment Company Type | N-1A | |
| Document Period End Date | Sep. 30, 2024 | |
| C000011390 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | BlackRock Total Return Fund | |
| Class Name | Institutional Shares | |
| Trading Symbol | MAHQX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about BlackRock Total Return Fund (the “Fund”) for the period of October 1, 2023 to September 30, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | (800) 441‑7762 | |
| Additional Information Website | blackrock.com/fundreports | |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class name Costs of a $10,000 Costs paid as a percentage of a Institutional Shares $ (a) 0.44 % (a) (a) Because the Fund invested all of its assets in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, prior to September 16, 2024, the expense example reflects the net expenses of both the Fund and the Master Portfolio in which it invested for a portion of the period. | |
| Expenses Paid, Amount | $ 47 | [1] |
| Expense Ratio, Percent | 0.44% | [1] |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? For the reporting period ended September 30, 2024, the Fund's Institutional Shares returned 12.13% For the same period, the Bloomberg U.S. Aggregate Bond Index returned 11.57%. What contributed to absolute performance? The Fund’s allocations to agency mortgage-backed securities, U.S. investment grade corporate bonds, and structured products contributed to performance for the annual period. What detracted from absolute The Fund’s positioning with respect to U.S. interest rates was the only source of negative return. The views expressed reflect the opinions of BlackRock as of the date of this report and are subject to change based on changes in market, economic or other conditions. These views are not intended to be a forecast of future events and are no guarantee of future results. | |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results. | |
| Line Graph [Table Text Block] | Fund performance Cumulative performance: October 1, 2014 through September 30, 2024 Initial investment of $10,000 See “Average annual total returns” for additional information on fund performance. | |
| Average Annual Return [Table Text Block] | Average annual total returns 1 Year 5 Years 10 Years Institutional Shares 12.13 % 0.79 % 2.18 % Bloomberg U.S. Aggregate Bond Index 11.57 0.33 1.84 | |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. | |
| Material Change Date | Sep. 16, 2024 | |
| Updated Performance Information Location [Text Block] | Visit blackrock.com | |
| Net Assets | $ 20,127,307,489 | |
| Holdings Count | Holding | 5,009 | |
| Advisory Fees Paid, Amount | $ 54,171,979 | |
| Investment Company Portfolio Turnover | 471% | |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets $ Number of Portfolio Holdings 5,009 Net Investment Advisory Fees $ Portfolio Turnover Rate 471 % | |
| Holdings [Text Block] | What did the Fund invest in? (as of September 30, 2024) Portfolio composition Investment Type Percent of Total (a) U.S. Government Sponsored Agency Securities 32.8 % Corporate Bonds 22.7 % U.S. Treasury Obligations 17.4 % Asset-Backed Securities 10.2 % Non-Agency Mortgage-Backed Securities 9.3 % Foreign Government Obligations 4.9 % Floating Rate Loan Interests 1.0 % Municipal Bonds 0.6 % Common Stocks 0.5 % Preferred Securities 0.3 % Fixed Rate Loan Interests 0.2 % Foreign Agency Obligations 0.1 % Warrants — % (b) Investment Companies — % (b) Credit quality allocation Credit Rating (c) Percent of Total (a) AAA/Aaa (d) 57.7 % AA/Aa 2.8 % A 8.8 % BBB/Baa 13.0 % BB/Ba 1.1 % B 0.5 % CCC/Caa 0.4 % CC/Ca 0.3 % C 0.2 % N/R 15.2 % (a) Excludes short-term securities, options purchased, options written and TBA sale commitments. (b) Rounds to less than 0.1%. (c) For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. (d) The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa. | |
| Credit Quality Explanation [Text Block] | The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa. | |
| Credit Ratings Selection [Text Block] | For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. | |
| Material Fund Change [Text Block] | Material Fund changes This is a summary of certain changes to the Fund since September 30, 2023. For more complete information, you may review the Fund’s next prospectus, which we expect to be available approximately 120 days after September 30, 2024 at blackrock.com/fundreports Effective September 16, 2024, the Fund ceased to invest in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, as part of a “master/feeder” structure and instead operates as a stand-alone fund. In connection with this change and in accordance with the investment advisory agreement, the Fund now pays a monthly fee at an annual rate equal to the following percentages of the average daily value of the Fund's net assets: 0.48% (first $250 million), 0.43% ($250 million - $500 million), 0.38% ($500 million - $750 million) and 0.34% (greater than $750 million). | |
| Material Fund Change Expenses [Text Block] | Effective September 16, 2024, the Fund ceased to invest in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, as part of a “master/feeder” structure and instead operates as a stand-alone fund. In connection with this change and in accordance with the investment advisory agreement, the Fund now pays a monthly fee at an annual rate equal to the following percentages of the average daily value of the Fund's net assets: 0.48% (first $250 million), 0.43% ($250 million - $500 million), 0.38% ($500 million - $750 million) and 0.34% (greater than $750 million). | |
| Updated Prospectus Phone Number | (800) 441-7762 | |
| Updated Prospectus Web Address | blackrock.com/fundreports | |
| C000052630 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | BlackRock Total Return Fund | |
| Class Name | Service Shares | |
| Trading Symbol | MSHQX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about BlackRock Total Return Fund (the “Fund”) for the period of October 1, 2023 to September 30, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | (800) 441‑7762 | |
| Additional Information Website | blackrock.com/fundreports | |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class name Costs of a $10,000 Costs paid as a percentage of a Service Shares $ (a) 0.75 % (a) (a) Because the Fund invested all of its assets in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, prior to September 16, 2024, the expense example reflects the net expenses of both the Fund and the Master Portfolio in which it invested for a portion of the period. | |
| Expenses Paid, Amount | $ 79 | [2] |
| Expense Ratio, Percent | 0.75% | [2] |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? For the reporting period ended September 30, 2024, the Fund's Service Shares returned 11.79% For the same period, the Bloomberg U.S. Aggregate Bond Index returned 11.57%. What contributed to absolute performance? The Fund’s allocations to agency mortgage-backed securities, U.S. investment grade corporate bonds, and structured products contributed to performance for the annual period. What detracted from absolute The Fund’s positioning with respect to U.S. interest rates was the only source of negative return. The views expressed reflect the opinions of BlackRock as of the date of this report and are subject to change based on changes in market, economic or other conditions. These views are not intended to be a forecast of future events and are no guarantee of future results. | |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results. | |
| Line Graph [Table Text Block] | Fund performance Cumulative performance: October 1, 2014 through September 30, 2024 Initial investment of $10,000 See “Average annual total returns” for additional information on fund performance. | |
| Average Annual Return [Table Text Block] | Average annual total returns 1 Year 5 Years 10 Years Service Shares 11.79 % 0.48 % 1.88 % Bloomberg U.S. Aggregate Bond Index 11.57 0.33 1.84 | |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. | |
| Material Change Date | Sep. 16, 2024 | |
| Updated Performance Information Location [Text Block] | Visit blackrock.com | |
| Net Assets | $ 20,127,307,489 | |
| Holdings Count | Holding | 5,009 | |
| Advisory Fees Paid, Amount | $ 54,171,979 | |
| Investment Company Portfolio Turnover | 471% | |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets $ Number of Portfolio Holdings 5,009 Net Investment Advisory Fees $ Portfolio Turnover Rate 471 % | |
| Holdings [Text Block] | What did the Fund invest in? (as of September 30, 2024) Portfolio composition Investment Type Percent of Total (a) U.S. Government Sponsored Agency Securities 32.8 % Corporate Bonds 22.7 % U.S. Treasury Obligations 17.4 % Asset-Backed Securities 10.2 % Non-Agency Mortgage-Backed Securities 9.3 % Foreign Government Obligations 4.9 % Floating Rate Loan Interests 1.0 % Municipal Bonds 0.6 % Common Stocks 0.5 % Preferred Securities 0.3 % Fixed Rate Loan Interests 0.2 % Foreign Agency Obligations 0.1 % Warrants — % (b) Investment Companies — % (b) Credit quality allocation Credit Rating (c) Percent of Total (a) AAA/Aaa (d) 57.7 % AA/Aa 2.8 % A 8.8 % BBB/Baa 13.0 % BB/Ba 1.1 % B 0.5 % CCC/Caa 0.4 % CC/Ca 0.3 % C 0.2 % N/R 15.2 % (a) Excludes short-term securities, options purchased, options written and TBA sale commitments. (b) Rounds to less than 0.1%. (c) For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. (d) The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa. | |
| Credit Quality Explanation [Text Block] | The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa. | |
| Credit Ratings Selection [Text Block] | For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. | |
| Material Fund Change [Text Block] | Material Fund changes This is a summary of certain changes to the Fund since September 30, 2023. For more complete information, you may review the Fund’s next prospectus, which we expect to be available approximately 120 days after September 30, 2024 at blackrock.com/fundreports Effective September 16, 2024, the Fund ceased to invest in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, as part of a “master/feeder” structure and instead operates as a stand-alone fund. In connection with this change and in accordance with the investment advisory agreement, the Fund now pays a monthly fee at an annual rate equal to the following percentages of the average daily value of the Fund's net assets: 0.48% (first $250 million), 0.43% ($250 million - $500 million), 0.38% ($500 million - $750 million) and 0.34% (greater than $750 million). | |
| Material Fund Change Expenses [Text Block] | Effective September 16, 2024, the Fund ceased to invest in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, as part of a “master/feeder” structure and instead operates as a stand-alone fund. In connection with this change and in accordance with the investment advisory agreement, the Fund now pays a monthly fee at an annual rate equal to the following percentages of the average daily value of the Fund's net assets: 0.48% (first $250 million), 0.43% ($250 million - $500 million), 0.38% ($500 million - $750 million) and 0.34% (greater than $750 million). | |
| Updated Prospectus Phone Number | (800) 441-7762 | |
| Updated Prospectus Web Address | blackrock.com/fundreports | |
| C000011387 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | BlackRock Total Return Fund | |
| Class Name | Investor A Shares | |
| Trading Symbol | MDHQX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about BlackRock Total Return Fund (the “Fund”) for the period of October 1, 2023 to September 30, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | (800) 441‑7762 | |
| Additional Information Website | blackrock.com/fundreports | |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class name Costs of a $10,000 Costs paid as a percentage of a Investor A Shares $ (a) 0.74 % (a) (a) Because the Fund invested all of its assets in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, prior to September 16, 2024, the expense example reflects the net expenses of both the Fund and the Master Portfolio in which it invested for a portion of the period. | |
| Expenses Paid, Amount | $ 78 | [3] |
| Expense Ratio, Percent | 0.74% | [3] |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? For the reporting period ended September 30, 2024, the Fund's Investor A Shares returned 11.90% For the same period, the Bloomberg U.S. Aggregate Bond Index returned 11.57%. What contributed to absolute performance? The Fund’s allocations to agency mortgage-backed securities, U.S. investment grade corporate bonds, and structured products contributed to performance for the annual period. What detracted from absolute The Fund’s positioning with respect to U.S. interest rates was the only source of negative return. The views expressed reflect the opinions of BlackRock as of the date of this report and are subject to change based on changes in market, economic or other conditions. These views are not intended to be a forecast of future events and are no guarantee of future results. | |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results. | |
| Line Graph [Table Text Block] | Fund performance Cumulative performance: October 1, 2014 through September 30, 2024 Initial investment of $10,000 See “Average annual total returns” for additional information on fund performance. | |
| Average Annual Return [Table Text Block] | Average annual total returns 1 Year 5 Years 10 Years Investor A Shares 11.90 % 0.48 % 1.87 % Investor A Shares (with sales charge) 7.43 (0.33 ) 1.45 Bloomberg U.S. Aggregate Bond Index 11.57 0.33 1.84 | |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. | |
| Material Change Date | Sep. 16, 2024 | |
| Updated Performance Information Location [Text Block] | Visit blackrock.com | |
| Net Assets | $ 20,127,307,489 | |
| Holdings Count | Holding | 5,009 | |
| Advisory Fees Paid, Amount | $ 54,171,979 | |
| Investment Company Portfolio Turnover | 471% | |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets $ Number of Portfolio Holdings 5,009 Net Investment Advisory Fees $ Portfolio Turnover Rate 471 % | |
| Holdings [Text Block] | What did the Fund invest in? (as of September 30, 2024) Portfolio composition Investment Type Percent of Total (a) U.S. Government Sponsored Agency Securities 32.8 % Corporate Bonds 22.7 % U.S. Treasury Obligations 17.4 % Asset-Backed Securities 10.2 % Non-Agency Mortgage-Backed Securities 9.3 % Foreign Government Obligations 4.9 % Floating Rate Loan Interests 1.0 % Municipal Bonds 0.6 % Common Stocks 0.5 % Preferred Securities 0.3 % Fixed Rate Loan Interests 0.2 % Foreign Agency Obligations 0.1 % Warrants — % (b) Investment Companies — % (b) Credit quality allocation Credit Rating (c) Percent of Total (a) AAA/Aaa (d) 57.7 % AA/Aa 2.8 % A 8.8 % BBB/Baa 13.0 % BB/Ba 1.1 % B 0.5 % CCC/Caa 0.4 % CC/Ca 0.3 % C 0.2 % N/R 15.2 % (a) Excludes short-term securities, options purchased, options written and TBA sale commitments. (b) Rounds to less than 0.1%. (c) For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. (d) The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa. | |
| Credit Quality Explanation [Text Block] | The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa. | |
| Credit Ratings Selection [Text Block] | For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. | |
| Material Fund Change [Text Block] | Material Fund changes This is a summary of certain changes to the Fund since September 30, 2023. For more complete information, you may review the Fund’s next prospectus, which we expect to be available approximately 120 days after September 30, 2024 at blackrock.com/fundreports Effective September 16, 2024, the Fund ceased to invest in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, as part of a “master/feeder” structure and instead operates as a stand-alone fund. In connection with this change and in accordance with the investment advisory agreement, the Fund now pays a monthly fee at an annual rate equal to the following percentages of the average daily value of the Fund's net assets: 0.48% (first $250 million), 0.43% ($250 million - $500 million), 0.38% ($500 million - $750 million) and 0.34% (greater than $750 million). | |
| Material Fund Change Expenses [Text Block] | Effective September 16, 2024, the Fund ceased to invest in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, as part of a “master/feeder” structure and instead operates as a stand-alone fund. In connection with this change and in accordance with the investment advisory agreement, the Fund now pays a monthly fee at an annual rate equal to the following percentages of the average daily value of the Fund's net assets: 0.48% (first $250 million), 0.43% ($250 million - $500 million), 0.38% ($500 million - $750 million) and 0.34% (greater than $750 million). | |
| Updated Prospectus Phone Number | (800) 441-7762 | |
| Updated Prospectus Web Address | blackrock.com/fundreports | |
| C000037618 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | BlackRock Total Return Fund | |
| Class Name | Investor A1 Shares | |
| Trading Symbol | MEHQX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about BlackRock Total Return Fund (the “Fund”) for the period of October 1, 2023 to September 30, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | (800) 441‑7762 | |
| Additional Information Website | blackrock.com/fundreports | |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class name Costs of a $10,000 Costs paid as a percentage of a Investor A1 Shares $ (a) 0.59 % (a) (a) Because the Fund invested all of its assets in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, prior to September 16, 2024, the expense example reflects the net expenses of both the Fund and the Master Portfolio in which it invested for a portion of the period. | |
| Expenses Paid, Amount | $ 63 | [4] |
| Expense Ratio, Percent | 0.59% | [4] |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? For the reporting period ended September 30, 2024, the Fund's Investor A1 Shares returned 12.08% For the same period, the Bloomberg U.S. Aggregate Bond Index returned 11.57%. What contributed to absolute performance? The Fund’s allocations to agency mortgage-backed securities, U.S. investment grade corporate bonds, and structured products contributed to performance for the annual period. What detracted from absolute The Fund’s positioning with respect to U.S. interest rates was the only source of negative return. The views expressed reflect the opinions of BlackRock as of the date of this report and are subject to change based on changes in market, economic or other conditions. These views are not intended to be a forecast of future events and are no guarantee of future results. | |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results. | |
| Line Graph [Table Text Block] | Fund performance Cumulative performance: October 1, 2014 through September 30, 2024 Initial investment of $10,000 See “Average annual total returns” for additional information on fund performance. | |
| Average Annual Return [Table Text Block] | Average annual total returns 1 Year 5 Years 10 Years Investor A1 Shares 12.08 % 0.64 % 2.04 % Bloomberg U.S. Aggregate Bond Index 11.57 0.33 1.84 | |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. | |
| Material Change Date | Sep. 16, 2024 | |
| Updated Performance Information Location [Text Block] | Visit blackrock.com | |
| Net Assets | $ 20,127,307,489 | |
| Holdings Count | Holding | 5,009 | |
| Advisory Fees Paid, Amount | $ 54,171,979 | |
| Investment Company Portfolio Turnover | 471% | |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets $ Number of Portfolio Holdings 5,009 Net Investment Advisory Fees $ Portfolio Turnover Rate 471 % | |
| Holdings [Text Block] | What did the Fund invest in? (as of September 30, 2024) Portfolio composition Investment Type Percent of Total (a) U.S. Government Sponsored Agency Securities 32.8 % Corporate Bonds 22.7 % U.S. Treasury Obligations 17.4 % Asset-Backed Securities 10.2 % Non-Agency Mortgage-Backed Securities 9.3 % Foreign Government Obligations 4.9 % Floating Rate Loan Interests 1.0 % Municipal Bonds 0.6 % Common Stocks 0.5 % Preferred Securities 0.3 % Fixed Rate Loan Interests 0.2 % Foreign Agency Obligations 0.1 % Warrants — % (b) Investment Companies — % (b) Credit quality allocation Credit Rating (c) Percent of Total (a) AAA/Aaa (d) 57.7 % AA/Aa 2.8 % A 8.8 % BBB/Baa 13.0 % BB/Ba 1.1 % B 0.5 % CCC/Caa 0.4 % CC/Ca 0.3 % C 0.2 % N/R 15.2 % (a) Excludes short-term securities, options purchased, options written and TBA sale commitments. (b) Rounds to less than 0.1%. (c) For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. (d) The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa. | |
| Credit Quality Explanation [Text Block] | The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa. | |
| Credit Ratings Selection [Text Block] | For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. | |
| Material Fund Change [Text Block] | Material Fund changes This is a summary of certain changes to the Fund since September 30, 2023. For more complete information, you may review the Fund’s next prospectus, which we expect to be available approximately 120 days after September 30, 2024 at blackrock.com/fundreports Effective September 16, 2024, the Fund ceased to invest in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, as part of a “master/feeder” structure and instead operates as a stand-alone fund. In connection with this change and in accordance with the investment advisory agreement, the Fund now pays a monthly fee at an annual rate equal to the following percentages of the average daily value of the Fund's net assets: 0.48% (first $250 million), 0.43% ($250 million - $500 million), 0.38% ($500 million - $750 million) and 0.34% (greater than $750 million). | |
| Material Fund Change Expenses [Text Block] | Effective September 16, 2024, the Fund ceased to invest in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, as part of a “master/feeder” structure and instead operates as a stand-alone fund. In connection with this change and in accordance with the investment advisory agreement, the Fund now pays a monthly fee at an annual rate equal to the following percentages of the average daily value of the Fund's net assets: 0.48% (first $250 million), 0.43% ($250 million - $500 million), 0.38% ($500 million - $750 million) and 0.34% (greater than $750 million). | |
| Updated Prospectus Phone Number | (800) 441-7762 | |
| Updated Prospectus Web Address | blackrock.com/fundreports | |
| C000037620 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | BlackRock Total Return Fund | |
| Class Name | Investor C Shares | |
| Trading Symbol | MFHQX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about BlackRock Total Return Fund (the “Fund”) for the period of October 1, 2023 to September 30, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | (800) 441‑7762 | |
| Additional Information Website | blackrock.com/fundreports | |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class name Costs of a $10,000 Costs paid as a percentage of a Investor C Shares $ (a) 1.44 % (a) (a) Because the Fund invested all of its assets in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, prior to September 16, 2024, the expense example reflects the net expenses of both the Fund and the Master Portfolio in which it invested for a portion of the period. | |
| Expenses Paid, Amount | $ 152 | [5] |
| Expense Ratio, Percent | 1.44% | [5] |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? For the reporting period ended September 30, 2024, the Fund's Investor C Shares returned 11.14% For the same period, the Bloomberg U.S. Aggregate Bond Index returned 11.57%. What contributed to absolute performance? The Fund’s allocations to agency mortgage-backed securities, U.S. investment grade corporate bonds, and structured products contributed to performance for the annual period. What detracted from absolute The Fund’s positioning with respect to U.S. interest rates was the only source of negative return. The views expressed reflect the opinions of BlackRock as of the date of this report and are subject to change based on changes in market, economic or other conditions. These views are not intended to be a forecast of future events and are no guarantee of future results. | |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results. | |
| Line Graph [Table Text Block] | Fund performance Cumulative performance: October 1, 2014 through September 30, 2024 Initial investment of $10,000 See “Average annual total returns” for additional information on fund performance. | |
| Average Annual Return [Table Text Block] | Average annual total returns 1 Year 5 Years 10 Years Investor C Shares 11.14 % (0.21 ) % 1.32 % Investor C Shares (with sales charge) 10.14 (0.21 ) 1.32 Bloomberg U.S. Aggregate Bond Index 11.57 0.33 1.84 | |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. | |
| Material Change Date | Sep. 16, 2024 | |
| Updated Performance Information Location [Text Block] | Visit blackrock.com | |
| Net Assets | $ 20,127,307,489 | |
| Holdings Count | Holding | 5,009 | |
| Advisory Fees Paid, Amount | $ 54,171,979 | |
| Investment Company Portfolio Turnover | 471% | |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets $ Number of Portfolio Holdings 5,009 Net Investment Advisory Fees $ Portfolio Turnover Rate 471 % | |
| Holdings [Text Block] | What did the Fund invest in? (as of September 30, 2024) Portfolio composition Investment Type Percent of Total (a) U.S. Government Sponsored Agency Securities 32.8 % Corporate Bonds 22.7 % U.S. Treasury Obligations 17.4 % Asset-Backed Securities 10.2 % Non-Agency Mortgage-Backed Securities 9.3 % Foreign Government Obligations 4.9 % Floating Rate Loan Interests 1.0 % Municipal Bonds 0.6 % Common Stocks 0.5 % Preferred Securities 0.3 % Fixed Rate Loan Interests 0.2 % Foreign Agency Obligations 0.1 % Warrants — % (b) Investment Companies — % (b) Credit quality allocation Credit Rating (c) Percent of Total (a) AAA/Aaa (d) 57.7 % AA/Aa 2.8 % A 8.8 % BBB/Baa 13.0 % BB/Ba 1.1 % B 0.5 % CCC/Caa 0.4 % CC/Ca 0.3 % C 0.2 % N/R 15.2 % (a) Excludes short-term securities, options purchased, options written and TBA sale commitments. (b) Rounds to less than 0.1%. (c) For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. (d) The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa. | |
| Credit Quality Explanation [Text Block] | The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa. | |
| Credit Ratings Selection [Text Block] | For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. | |
| Material Fund Change [Text Block] | Material Fund changes This is a summary of certain changes to the Fund since September 30, 2023. For more complete information, you may review the Fund’s next prospectus, which we expect to be available approximately 120 days after September 30, 2024 at blackrock.com/fundreports Effective September 16, 2024, the Fund ceased to invest in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, as part of a “master/feeder” structure and instead operates as a stand-alone fund. In connection with this change and in accordance with the investment advisory agreement, the Fund now pays a monthly fee at an annual rate equal to the following percentages of the average daily value of the Fund's net assets: 0.48% (first $250 million), 0.43% ($250 million - $500 million), 0.38% ($500 million - $750 million) and 0.34% (greater than $750 million). | |
| Material Fund Change Expenses [Text Block] | Effective September 16, 2024, the Fund ceased to invest in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, as part of a “master/feeder” structure and instead operates as a stand-alone fund. In connection with this change and in accordance with the investment advisory agreement, the Fund now pays a monthly fee at an annual rate equal to the following percentages of the average daily value of the Fund's net assets: 0.48% (first $250 million), 0.43% ($250 million - $500 million), 0.38% ($500 million - $750 million) and 0.34% (greater than $750 million). | |
| Updated Prospectus Phone Number | (800) 441-7762 | |
| Updated Prospectus Web Address | blackrock.com/fundreports | |
| C000052631 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | BlackRock Total Return Fund | |
| Class Name | Class K Shares | |
| Trading Symbol | MPHQX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about BlackRock Total Return Fund (the “Fund”) for the period of October 1, 2023 to September 30, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | (800) 441‑7762 | |
| Additional Information Website | blackrock.com/fundreports | |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class name Costs of a $10,000 Costs paid as a percentage of a Class K Shares $ (a) 0.37 % (a) (a) Because the Fund invested all of its assets in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, prior to September 16, 2024, the expense example reflects the net expenses of both the Fund and the Master Portfolio in which it invested for a portion of the period. | |
| Expenses Paid, Amount | $ 39 | [6] |
| Expense Ratio, Percent | 0.37% | [6] |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? For the reporting period ended September 30, 2024, the Fund's Class K Shares returned 12.33% For the same period, the Bloomberg U.S. Aggregate Bond Index returned 11.57%. What contributed to absolute performance? The Fund’s allocations to agency mortgage-backed securities, U.S. investment grade corporate bonds, and structured products contributed to performance for the annual period. What detracted from absolute The Fund’s positioning with respect to U.S. interest rates was the only source of negative return. The views expressed reflect the opinions of BlackRock as of the date of this report and are subject to change based on changes in market, economic or other conditions. These views are not intended to be a forecast of future events and are no guarantee of future results. | |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results. | |
| Line Graph [Table Text Block] | Fund performance Cumulative performance: October 1, 2014 through September 30, 2024 Initial investment of $10,000 See “Average annual total returns” for additional information on fund performance. | |
| Average Annual Return [Table Text Block] | Average annual total returns 1 Year 5 Years 10 Years Class K Shares 12.33 % 0.86 % 2.25 % Bloomberg U.S. Aggregate Bond Index 11.57 0.33 1.84 | |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. | |
| Material Change Date | Sep. 16, 2024 | |
| Updated Performance Information Location [Text Block] | Visit blackrock.com | |
| Net Assets | $ 20,127,307,489 | |
| Holdings Count | Holding | 5,009 | |
| Advisory Fees Paid, Amount | $ 54,171,979 | |
| Investment Company Portfolio Turnover | 471% | |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets $ Number of Portfolio Holdings 5,009 Net Investment Advisory Fees $ Portfolio Turnover Rate 471 % | |
| Holdings [Text Block] | What did the Fund invest in? (as of September 30, 2024) Portfolio composition Investment Type Percent of Total (a) U.S. Government Sponsored Agency Securities 32.8 % Corporate Bonds 22.7 % U.S. Treasury Obligations 17.4 % Asset-Backed Securities 10.2 % Non-Agency Mortgage-Backed Securities 9.3 % Foreign Government Obligations 4.9 % Floating Rate Loan Interests 1.0 % Municipal Bonds 0.6 % Common Stocks 0.5 % Preferred Securities 0.3 % Fixed Rate Loan Interests 0.2 % Foreign Agency Obligations 0.1 % Warrants — % (b) Investment Companies — % (b) Credit quality allocation Credit Rating (c) Percent of Total (a) AAA/Aaa (d) 57.7 % AA/Aa 2.8 % A 8.8 % BBB/Baa 13.0 % BB/Ba 1.1 % B 0.5 % CCC/Caa 0.4 % CC/Ca 0.3 % C 0.2 % N/R 15.2 % (a) Excludes short-term securities, options purchased, options written and TBA sale commitments. (b) Rounds to less than 0.1%. (c) For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. (d) The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa. | |
| Credit Quality Explanation [Text Block] | The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa. | |
| Credit Ratings Selection [Text Block] | For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. | |
| Material Fund Change [Text Block] | Material Fund changes This is a summary of certain changes to the Fund since September 30, 2023. For more complete information, you may review the Fund’s next prospectus, which we expect to be available approximately 120 days after September 30, 2024 at blackrock.com/fundreports Effective September 16, 2024, the Fund ceased to invest in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, as part of a “master/feeder” structure and instead operates as a stand-alone fund. In connection with this change and in accordance with the investment advisory agreement, the Fund now pays a monthly fee at an annual rate equal to the following percentages of the average daily value of the Fund's net assets: 0.48% (first $250 million), 0.43% ($250 million - $500 million), 0.38% ($500 million - $750 million) and 0.34% (greater than $750 million). | |
| Material Fund Change Expenses [Text Block] | Effective September 16, 2024, the Fund ceased to invest in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, as part of a “master/feeder” structure and instead operates as a stand-alone fund. In connection with this change and in accordance with the investment advisory agreement, the Fund now pays a monthly fee at an annual rate equal to the following percentages of the average daily value of the Fund's net assets: 0.48% (first $250 million), 0.43% ($250 million - $500 million), 0.38% ($500 million - $750 million) and 0.34% (greater than $750 million). | |
| Updated Prospectus Phone Number | (800) 441-7762 | |
| Updated Prospectus Web Address | blackrock.com/fundreports | |
| C000011391 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | BlackRock Total Return Fund | |
| Class Name | Class R Shares | |
| Trading Symbol | MRCBX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about BlackRock Total Return Fund (the “Fund”) for the period of October 1, 2023 to September 30, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | (800) 441‑7762 | |
| Additional Information Website | blackrock.com/fundreports | |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class name Costs of a $10,000 Costs paid as a percentage of a Class R Shares $ (a) 1.03 % (a) (a) Because the Fund invested all of its assets in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, prior to September 16, 2024, the expense example reflects the net expenses of both the Fund and the Master Portfolio in which it invested for a portion of the period. | |
| Expenses Paid, Amount | $ 109 | [7] |
| Expense Ratio, Percent | 1.03% | [7] |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? For the reporting period ended September 30, 2024, the Fund's Class R Shares returned 11.59% For the same period, the Bloomberg U.S. Aggregate Bond Index returned 11.57%. What contributed to absolute performance? The Fund’s allocations to agency mortgage-backed securities, U.S. investment grade corporate bonds, and structured products contributed to performance for the annual period. What detracted from absolute The Fund’s positioning with respect to U.S. interest rates was the only source of negative return. The views expressed reflect the opinions of BlackRock as of the date of this report and are subject to change based on changes in market, economic or other conditions. These views are not intended to be a forecast of future events and are no guarantee of future results. | |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results. | |
| Line Graph [Table Text Block] | Fund performance Cumulative performance: October 1, 2014 through September 30, 2024 Initial investment of $10,000 See “Average annual total returns” for additional information on fund performance. | |
| Average Annual Return [Table Text Block] | Average annual total returns 1 Year 5 Years 10 Years Class R Shares 11.59 % 0.20 % 1.59 % Bloomberg U.S. Aggregate Bond Index 11.57 0.33 1.84 | |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. | |
| Material Change Date | Sep. 16, 2024 | |
| Updated Performance Information Location [Text Block] | Visit blackrock.com | |
| Net Assets | $ 20,127,307,489 | |
| Holdings Count | Holding | 5,009 | |
| Advisory Fees Paid, Amount | $ 54,171,979 | |
| Investment Company Portfolio Turnover | 471% | |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets $ Number of Portfolio Holdings 5,009 Net Investment Advisory Fees $ Portfolio Turnover Rate 471 % | |
| Holdings [Text Block] | What did the Fund invest in? (as of September 30, 2024) Portfolio composition Investment Type Percent of Total (a) U.S. Government Sponsored Agency Securities 32.8 % Corporate Bonds 22.7 % U.S. Treasury Obligations 17.4 % Asset-Backed Securities 10.2 % Non-Agency Mortgage-Backed Securities 9.3 % Foreign Government Obligations 4.9 % Floating Rate Loan Interests 1.0 % Municipal Bonds 0.6 % Common Stocks 0.5 % Preferred Securities 0.3 % Fixed Rate Loan Interests 0.2 % Foreign Agency Obligations 0.1 % Warrants — % (b) Investment Companies — % (b) Credit quality allocation Credit Rating (c) Percent of Total (a) AAA/Aaa (d) 57.7 % AA/Aa 2.8 % A 8.8 % BBB/Baa 13.0 % BB/Ba 1.1 % B 0.5 % CCC/Caa 0.4 % CC/Ca 0.3 % C 0.2 % N/R 15.2 % (a) Excludes short-term securities, options purchased, options written and TBA sale commitments. (b) Rounds to less than 0.1%. (c) For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. (d) The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa. | |
| Credit Quality Explanation [Text Block] | The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa. | |
| Credit Ratings Selection [Text Block] | For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. | |
| Material Fund Change [Text Block] | Material Fund changes This is a summary of certain changes to the Fund since September 30, 2023. For more complete information, you may review the Fund’s next prospectus, which we expect to be available approximately 120 days after September 30, 2024 at blackrock.com/fundreports Effective September 16, 2024, the Fund ceased to invest in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, as part of a “master/feeder” structure and instead operates as a stand-alone fund. In connection with this change and in accordance with the investment advisory agreement, the Fund now pays a monthly fee at an annual rate equal to the following percentages of the average daily value of the Fund's net assets: 0.48% (first $250 million), 0.43% ($250 million - $500 million), 0.38% ($500 million - $750 million) and 0.34% (greater than $750 million). | |
| Material Fund Change Expenses [Text Block] | Effective September 16, 2024, the Fund ceased to invest in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, as part of a “master/feeder” structure and instead operates as a stand-alone fund. In connection with this change and in accordance with the investment advisory agreement, the Fund now pays a monthly fee at an annual rate equal to the following percentages of the average daily value of the Fund's net assets: 0.48% (first $250 million), 0.43% ($250 million - $500 million), 0.38% ($500 million - $750 million) and 0.34% (greater than $750 million). | |
| Updated Prospectus Phone Number | (800) 441-7762 | |
| Updated Prospectus Web Address | blackrock.com/fundreports | |
| [1]Because the Fund invested all of its assets in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, prior to September 16, 2024, the expense example reflects the net expenses of both the Fund and the Master Portfolio in which it invested for a portion of the period.[2]Because the Fund invested all of its assets in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, prior to September 16, 2024, the expense example reflects the net expenses of both the Fund and the Master Portfolio in which it invested for a portion of the period.[3]Because the Fund invested all of its assets in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, prior to September 16, 2024, the expense example reflects the net expenses of both the Fund and the Master Portfolio in which it invested for a portion of the period.[4]Because the Fund invested all of its assets in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, prior to September 16, 2024, the expense example reflects the net expenses of both the Fund and the Master Portfolio in which it invested for a portion of the period.[5]Because the Fund invested all of its assets in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, prior to September 16, 2024, the expense example reflects the net expenses of both the Fund and the Master Portfolio in which it invested for a portion of the period.[6]Because the Fund invested all of its assets in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, prior to September 16, 2024, the expense example reflects the net expenses of both the Fund and the Master Portfolio in which it invested for a portion of the period.[7]Because the Fund invested all of its assets in Master Total Return Portfolio (the “Master Portfolio”), a series of Master Bond LLC, prior to September 16, 2024, the expense example reflects the net expenses of both the Fund and the Master Portfolio in which it invested for a portion of the period. | ||
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | 60 Months Ended | 120 Months Ended | ||||||||||
| Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014 | |
| C000011390 [Member] | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Institutional Shares | ||||||||||||
| Account Value | $ 12,408 | $ 12,408 | $ 12,408 | $ 11,066 | $ 10,923 | $ 12,988 | $ 12,828 | $ 11,932 | $ 10,825 | $ 10,995 | $ 10,839 | $ 10,277 | $ 10,000 |
| Average Annual Return, Percent | 12.13% | 0.79% | 2.18% | ||||||||||
| C000052630 [Member] | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Service Shares | ||||||||||||
| Account Value | $ 12,046 | $ 12,046 | $ 12,046 | 10,776 | 10,670 | 12,727 | 12,619 | 11,763 | 10,713 | 10,905 | 10,784 | 10,255 | 10,000 |
| Average Annual Return, Percent | 11.79% | 0.48% | 1.88% | ||||||||||
| C000011387 [Member] | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Investor A Shares (with sales charge) | ||||||||||||
| Average Annual Return, Percent | 7.43% | (0.33%) | 1.45% | ||||||||||
| C000011387 [Member] | Without Sales Load [Member] | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Investor A Shares | ||||||||||||
| Account Value | $ 11,550 | $ 11,550 | $ 11,550 | 10,321 | 10,228 | 12,187 | 12,082 | 11,275 | 10,264 | 10,460 | 10,338 | 9,834 | 9,600 |
| Average Annual Return, Percent | 11.90% | 0.48% | 1.87% | ||||||||||
| C000037618 [Member] | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Investor A1 Shares | ||||||||||||
| Account Value | $ 12,237 | $ 12,237 | $ 12,237 | 10,918 | 10,804 | 12,855 | 12,726 | 11,855 | 10,771 | 10,956 | 10,808 | 10,263 | 10,000 |
| Average Annual Return, Percent | 12.08% | 0.64% | 2.04% | ||||||||||
| C000037620 [Member] | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Investor C Shares (with sales charge) | ||||||||||||
| Average Annual Return, Percent | 10.14% | (0.21%) | 1.32% | ||||||||||
| C000037620 [Member] | Without Sales Load [Member] | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Investor C Shares | ||||||||||||
| Account Value | $ 11,400 | $ 11,400 | $ 11,400 | 10,187 | 10,095 | 12,115 | 12,095 | 11,363 | 10,411 | 10,681 | 10,626 | 10,176 | 10,000 |
| Average Annual Return, Percent | 11.14% | (0.21%) | 1.32% | ||||||||||
| C000052631 [Member] | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Class K Shares | ||||||||||||
| Account Value | $ 12,492 | $ 12,492 | $ 12,492 | 11,121 | 10,980 | 13,047 | 12,877 | 11,969 | 10,851 | 11,015 | 10,843 | 10,284 | 10,000 |
| Average Annual Return, Percent | 12.33% | 0.86% | 2.25% | ||||||||||
| C000011391 [Member] | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Class R Shares | ||||||||||||
| Account Value | $ 11,713 | $ 11,713 | $ 11,713 | 10,497 | 10,433 | 12,467 | 12,396 | 11,598 | 10,584 | 10,814 | 10,714 | 10,219 | 10,000 |
| Average Annual Return, Percent | 11.59% | 0.20% | 1.59% | ||||||||||
| Bloomberg U S Aggregate Bond Index [Member] | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index | ||||||||||||
| Account Value | $ 12,004 | $ 12,004 | $ 12,004 | $ 10,760 | $ 10,691 | $ 12,518 | $ 12,632 | $ 11,807 | $ 10,705 | $ 10,836 | $ 10,829 | $ 10,294 | $ 10,000 |
| Average Annual Return, Percent | 11.57% | 0.33% | 1.84% |
| Shareholder Report, Holdings (Details) | Sep. 30, 2024 | |
| C000011390 [Member] | N R [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 15.20% | [1],[2] |
| C000011390 [Member] | Standard & Poor's, AAA Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 57.70% | [1],[2],[3] |
| C000011390 [Member] | Standard & Poor's, AA Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.80% | [1],[2] |
| C000011390 [Member] | Standard & Poor's, A Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 8.80% | [1],[2] |
| C000011390 [Member] | Standard & Poor's, BBB Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 13% | [1],[2] |
| C000011390 [Member] | Standard & Poor's, BB Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.10% | [1],[2] |
| C000011390 [Member] | Standard & Poor's, B Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.50% | [1],[2] |
| C000011390 [Member] | Standard & Poor's, CCC Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.40% | [1],[2] |
| C000011390 [Member] | Standard & Poor's, CC Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.30% | [1],[2] |
| C000011390 [Member] | Standard & Poor's, C Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.20% | [1],[2] |
| C000011390 [Member] | Asset-Backed Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 10.20% | [1] |
| C000011390 [Member] | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.50% | [1] |
| C000011390 [Member] | Corporate Bond Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 22.70% | [1] |
| C000011390 [Member] | Municipal Bonds [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.60% | [1] |
| C000011390 [Member] | Warrant [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | [1],[4] | |
| C000011390 [Member] | U S Government Sponsored Agency Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 32.80% | [1] |
| C000011390 [Member] | U S Treasury Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 17.40% | [1] |
| C000011390 [Member] | Non Agency Mortgage Backed Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 9.30% | [1] |
| C000011390 [Member] | Foreign Government Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 4.90% | [1] |
| C000011390 [Member] | Floating Rate Loan Interests [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1% | [1] |
| C000011390 [Member] | Preferred Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.30% | [1] |
| C000011390 [Member] | Fixed Rate Loan Interests [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.20% | [1] |
| C000011390 [Member] | Foreign Agency Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.10% | [1] |
| C000011390 [Member] | Investment Companies [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | [1],[4] | |
| C000052630 [Member] | N R [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 15.20% | [5],[6] |
| C000052630 [Member] | Standard & Poor's, AAA Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 57.70% | [5],[6],[7] |
| C000052630 [Member] | Standard & Poor's, AA Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.80% | [5],[6] |
| C000052630 [Member] | Standard & Poor's, A Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 8.80% | [5],[6] |
| C000052630 [Member] | Standard & Poor's, BBB Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 13% | [5],[6] |
| C000052630 [Member] | Standard & Poor's, BB Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.10% | [5],[6] |
| C000052630 [Member] | Standard & Poor's, B Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.50% | [5],[6] |
| C000052630 [Member] | Standard & Poor's, CCC Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.40% | [5],[6] |
| C000052630 [Member] | Standard & Poor's, CC Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.30% | [5],[6] |
| C000052630 [Member] | Standard & Poor's, C Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.20% | [5],[6] |
| C000052630 [Member] | Asset-Backed Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 10.20% | [5] |
| C000052630 [Member] | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.50% | [5] |
| C000052630 [Member] | Corporate Bond Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 22.70% | [5] |
| C000052630 [Member] | Municipal Bonds [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.60% | [5] |
| C000052630 [Member] | Warrant [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | [5],[8] | |
| C000052630 [Member] | U S Government Sponsored Agency Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 32.80% | [5] |
| C000052630 [Member] | U S Treasury Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 17.40% | [5] |
| C000052630 [Member] | Non Agency Mortgage Backed Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 9.30% | [5] |
| C000052630 [Member] | Foreign Government Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 4.90% | [5] |
| C000052630 [Member] | Floating Rate Loan Interests [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1% | [5] |
| C000052630 [Member] | Preferred Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.30% | [5] |
| C000052630 [Member] | Fixed Rate Loan Interests [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.20% | [5] |
| C000052630 [Member] | Foreign Agency Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.10% | [5] |
| C000052630 [Member] | Investment Companies [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | [5],[8] | |
| C000011387 [Member] | N R [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 15.20% | [9],[10] |
| C000011387 [Member] | Standard & Poor's, AAA Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 57.70% | [9],[10],[11] |
| C000011387 [Member] | Standard & Poor's, AA Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.80% | [9],[10] |
| C000011387 [Member] | Standard & Poor's, A Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 8.80% | [9],[10] |
| C000011387 [Member] | Standard & Poor's, BBB Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 13% | [9],[10] |
| C000011387 [Member] | Standard & Poor's, BB Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.10% | [9],[10] |
| C000011387 [Member] | Standard & Poor's, B Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.50% | [9],[10] |
| C000011387 [Member] | Standard & Poor's, CCC Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.40% | [9],[10] |
| C000011387 [Member] | Standard & Poor's, CC Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.30% | [9],[10] |
| C000011387 [Member] | Standard & Poor's, C Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.20% | [9],[10] |
| C000011387 [Member] | Asset-Backed Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 10.20% | [9] |
| C000011387 [Member] | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.50% | [9] |
| C000011387 [Member] | Corporate Bond Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 22.70% | [9] |
| C000011387 [Member] | Municipal Bonds [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.60% | [9] |
| C000011387 [Member] | Warrant [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | [9],[12] | |
| C000011387 [Member] | U S Government Sponsored Agency Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 32.80% | [9] |
| C000011387 [Member] | U S Treasury Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 17.40% | [9] |
| C000011387 [Member] | Non Agency Mortgage Backed Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 9.30% | [9] |
| C000011387 [Member] | Foreign Government Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 4.90% | [9] |
| C000011387 [Member] | Floating Rate Loan Interests [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1% | [9] |
| C000011387 [Member] | Preferred Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.30% | [9] |
| C000011387 [Member] | Fixed Rate Loan Interests [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.20% | [9] |
| C000011387 [Member] | Foreign Agency Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.10% | [9] |
| C000011387 [Member] | Investment Companies [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | [9],[12] | |
| C000037618 [Member] | N R [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 15.20% | [13],[14] |
| C000037618 [Member] | Standard & Poor's, AAA Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 57.70% | [13],[14],[15] |
| C000037618 [Member] | Standard & Poor's, AA Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.80% | [13],[14] |
| C000037618 [Member] | Standard & Poor's, A Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 8.80% | [13],[14] |
| C000037618 [Member] | Standard & Poor's, BBB Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 13% | [13],[14] |
| C000037618 [Member] | Standard & Poor's, BB Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.10% | [13],[14] |
| C000037618 [Member] | Standard & Poor's, B Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.50% | [13],[14] |
| C000037618 [Member] | Standard & Poor's, CCC Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.40% | [13],[14] |
| C000037618 [Member] | Standard & Poor's, CC Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.30% | [13],[14] |
| C000037618 [Member] | Standard & Poor's, C Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.20% | [13],[14] |
| C000037618 [Member] | Asset-Backed Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 10.20% | [13] |
| C000037618 [Member] | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.50% | [13] |
| C000037618 [Member] | Corporate Bond Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 22.70% | [13] |
| C000037618 [Member] | Municipal Bonds [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.60% | [13] |
| C000037618 [Member] | Warrant [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | [13],[16] | |
| C000037618 [Member] | U S Government Sponsored Agency Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 32.80% | [13] |
| C000037618 [Member] | U S Treasury Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 17.40% | [13] |
| C000037618 [Member] | Non Agency Mortgage Backed Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 9.30% | [13] |
| C000037618 [Member] | Foreign Government Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 4.90% | [13] |
| C000037618 [Member] | Floating Rate Loan Interests [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1% | [13] |
| C000037618 [Member] | Preferred Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.30% | [13] |
| C000037618 [Member] | Fixed Rate Loan Interests [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.20% | [13] |
| C000037618 [Member] | Foreign Agency Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.10% | [13] |
| C000037618 [Member] | Investment Companies [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | [13],[16] | |
| C000037620 [Member] | N R [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 15.20% | [17],[18] |
| C000037620 [Member] | Standard & Poor's, AAA Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 57.70% | [17],[18],[19] |
| C000037620 [Member] | Standard & Poor's, AA Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.80% | [17],[18] |
| C000037620 [Member] | Standard & Poor's, A Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 8.80% | [17],[18] |
| C000037620 [Member] | Standard & Poor's, BBB Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 13% | [17],[18] |
| C000037620 [Member] | Standard & Poor's, BB Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.10% | [17],[18] |
| C000037620 [Member] | Standard & Poor's, B Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.50% | [17],[18] |
| C000037620 [Member] | Standard & Poor's, CCC Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.40% | [17],[18] |
| C000037620 [Member] | Standard & Poor's, CC Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.30% | [17],[18] |
| C000037620 [Member] | Standard & Poor's, C Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.20% | [17],[18] |
| C000037620 [Member] | Asset-Backed Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 10.20% | [17] |
| C000037620 [Member] | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.50% | [17] |
| C000037620 [Member] | Corporate Bond Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 22.70% | [17] |
| C000037620 [Member] | Municipal Bonds [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.60% | [17] |
| C000037620 [Member] | Warrant [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | [17],[20] | |
| C000037620 [Member] | U S Government Sponsored Agency Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 32.80% | [17] |
| C000037620 [Member] | U S Treasury Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 17.40% | [17] |
| C000037620 [Member] | Non Agency Mortgage Backed Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 9.30% | [17] |
| C000037620 [Member] | Foreign Government Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 4.90% | [17] |
| C000037620 [Member] | Floating Rate Loan Interests [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1% | [17] |
| C000037620 [Member] | Preferred Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.30% | [17] |
| C000037620 [Member] | Fixed Rate Loan Interests [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.20% | [17] |
| C000037620 [Member] | Foreign Agency Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.10% | [17] |
| C000037620 [Member] | Investment Companies [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | [17],[20] | |
| C000052631 [Member] | N R [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 15.20% | [21],[22] |
| C000052631 [Member] | Standard & Poor's, AAA Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 57.70% | [21],[22],[23] |
| C000052631 [Member] | Standard & Poor's, AA Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.80% | [21],[22] |
| C000052631 [Member] | Standard & Poor's, A Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 8.80% | [21],[22] |
| C000052631 [Member] | Standard & Poor's, BBB Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 13% | [21],[22] |
| C000052631 [Member] | Standard & Poor's, BB Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.10% | [21],[22] |
| C000052631 [Member] | Standard & Poor's, B Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.50% | [21],[22] |
| C000052631 [Member] | Standard & Poor's, CCC Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.40% | [21],[22] |
| C000052631 [Member] | Standard & Poor's, CC Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.30% | [21],[22] |
| C000052631 [Member] | Standard & Poor's, C Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.20% | [21],[22] |
| C000052631 [Member] | Asset-Backed Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 10.20% | [21] |
| C000052631 [Member] | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.50% | [21] |
| C000052631 [Member] | Corporate Bond Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 22.70% | [21] |
| C000052631 [Member] | Municipal Bonds [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.60% | [21] |
| C000052631 [Member] | Warrant [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | [21],[24] | |
| C000052631 [Member] | U S Government Sponsored Agency Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 32.80% | [21] |
| C000052631 [Member] | U S Treasury Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 17.40% | [21] |
| C000052631 [Member] | Non Agency Mortgage Backed Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 9.30% | [21] |
| C000052631 [Member] | Foreign Government Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 4.90% | [21] |
| C000052631 [Member] | Floating Rate Loan Interests [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1% | [21] |
| C000052631 [Member] | Preferred Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.30% | [21] |
| C000052631 [Member] | Fixed Rate Loan Interests [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.20% | [21] |
| C000052631 [Member] | Foreign Agency Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.10% | [21] |
| C000052631 [Member] | Investment Companies [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | [21],[24] | |
| C000011391 [Member] | N R [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 15.20% | [25],[26] |
| C000011391 [Member] | Standard & Poor's, AAA Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 57.70% | [25],[26],[27] |
| C000011391 [Member] | Standard & Poor's, AA Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.80% | [25],[26] |
| C000011391 [Member] | Standard & Poor's, A Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 8.80% | [25],[26] |
| C000011391 [Member] | Standard & Poor's, BBB Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 13% | [25],[26] |
| C000011391 [Member] | Standard & Poor's, BB Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1.10% | [25],[26] |
| C000011391 [Member] | Standard & Poor's, B Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.50% | [25],[26] |
| C000011391 [Member] | Standard & Poor's, CCC Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.40% | [25],[26] |
| C000011391 [Member] | Standard & Poor's, CC Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.30% | [25],[26] |
| C000011391 [Member] | Standard & Poor's, C Rating [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.20% | [25],[26] |
| C000011391 [Member] | Asset-Backed Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 10.20% | [25] |
| C000011391 [Member] | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.50% | [25] |
| C000011391 [Member] | Corporate Bond Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 22.70% | [25] |
| C000011391 [Member] | Municipal Bonds [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.60% | [25] |
| C000011391 [Member] | Warrant [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | [25],[28] | |
| C000011391 [Member] | U S Government Sponsored Agency Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 32.80% | [25] |
| C000011391 [Member] | U S Treasury Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 17.40% | [25] |
| C000011391 [Member] | Non Agency Mortgage Backed Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 9.30% | [25] |
| C000011391 [Member] | Foreign Government Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 4.90% | [25] |
| C000011391 [Member] | Floating Rate Loan Interests [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 1% | [25] |
| C000011391 [Member] | Preferred Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.30% | [25] |
| C000011391 [Member] | Fixed Rate Loan Interests [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.20% | [25] |
| C000011391 [Member] | Foreign Agency Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.10% | [25] |
| C000011391 [Member] | Investment Companies [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | [25],[28] | |
| [1]Excludes short-term securities, options purchased, options written and TBA sale commitments.[2]For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change.[3]The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa.[4]Rounds to less than 0.1%.[5]Excludes short-term securities, options purchased, options written and TBA sale commitments.[6]For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change.[7]The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa.[8]Rounds to less than 0.1%.[9]Excludes short-term securities, options purchased, options written and TBA sale commitments.[10]For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change.[11]The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa.[12]Rounds to less than 0.1%.[13]Excludes short-term securities, options purchased, options written and TBA sale commitments.[14]For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change.[15]The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa.[16]Rounds to less than 0.1%.[17]Excludes short-term securities, options purchased, options written and TBA sale commitments.[18]For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change.[19]The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa.[20]Rounds to less than 0.1%.[21]Excludes short-term securities, options purchased, options written and TBA sale commitments.[22]For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change.[23]The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa.[24]Rounds to less than 0.1%.[25]Excludes short-term securities, options purchased, options written and TBA sale commitments.[26]For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change.[27]The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa.[28]Rounds to less than 0.1%. | ||
