| Form N-CSR Cover | 12 Months Ended |
| May 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | BlackRock Municipal Bond Fund, Inc. |
| Entity Central Index Key | 0000225635 |
| Document Period End Date | May 31, 2024 |
| Shareholder Report | 12 Months Ended |
| May 31, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | BlackRock Municipal Bond Fund, Inc. |
| Entity Central Index Key | 0000225635 |
| Document Period End Date | May 31, 2024 |
| C000234661 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | BlackRock Impact Municipal Fund |
| Class Name | Institutional Shares |
| Trading Symbol | MPICX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about BlackRock Impact Municipal Fund (the “Fund”) for the period of June 1, 2023 to May 31, 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 . |
| 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 $ 0.58 % |
| Expenses Paid, Amount | $ 59 |
| Expense Ratio, Percent | 0.58% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? The municipal bond market gained ground during the reporting period, with the benefit of income augmented by a modest gain in prices. Declining inflation fueled expectations that the U.S. Federal Reserve was set to begin cutting interest rates in 2024, benefiting the broader fixed-income market. Municipal bonds were further helped by positive economic growth, strong issuer fundamentals, and favorable supply-and-demand trends. What contributed to performance? The Fund’s use of U.S. Treasury futures to manage interest-rate risk added to relative performance to the benchmark (65% Bloomberg U.S. Municipal Bond Index/35% Bloomberg Municipal High Yield Bond Index). An overweight in bonds with maturities of 18 to 25 years also contributed, as did large overweights in AA, A, and BBB rated issues. Security selection in the housing, utilities, education, corporate-backed, and school district sectors contributed, as well. The Fund’s use of derivatives marginally contributed to performance. What detracted from performance? An overweight in bonds with maturities of 25 years and above and an underweight in those with maturities of 12 to 18 years detracted from results. Underweights in both AAA-rated and high-yield securities also hurt relative performance. At the sector level, underweights in the transportation, tobacco, and tax-backed state sectors detracted. 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: March 14, 2022 through May 31, 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 Since Institutional Shares 5.01 % 1.61 % Bloomberg Municipal Bond Index 2.67 % 0.16 % 65% Bloomberg U.S. Municipal Bond Index/35% Bloomberg Municipal High Yield Bond Index 4.58 % 0.36 % |
| 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. |
| Updated Performance Information Location [Text Block] | Visit blackrock.com |
| Net Assets | $ 48,874,629 |
| Holdings Count | Holding | 82 |
| Advisory Fees Paid, Amount | $ 10,609 |
| Investment Company Portfolio Turnover | 18% |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets $ % Number of Portfolio Holdings $ % Net Investment Advisory Fees $ % Portfolio Turnover Rate $ % |
| Holdings [Text Block] | What did the Fund invest in? (as of May 31, 2024) Sector allocation Sector (a)(b) Percent of Housing 17.7 % Education 17.7 % Transportation 16.7 % Health 12.7 % County/City/Special District/School District 11.6 % Utilities 10.1 % Corporate 9.2 % State 4.3 % Credit quality allocation Credit Rating (a)(c) Percent of AAA/Aaa 6.4 % AA/Aa 52.3 % A 22.2 % BBB/Baa 7.4 % BB/Ba 3.9 % N/R 7.8 % (a) (b) (c) Excludes short-term securities. (a) (b) (c) For purposes of this report, sector sub-classifications may differ from those utilized for compliance purposes. (a) (b) (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. |
| 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. |
| C000234662 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | BlackRock Impact Municipal Fund |
| Class Name | Class K Shares |
| Trading Symbol | MPKCX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about BlackRock Impact Municipal Fund (the “Fund”) for the period of June 1, 2023 to May 31, 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 . |
| 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 $ 0.53 % |
| Expenses Paid, Amount | $ 54 |
| Expense Ratio, Percent | 0.53% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? The municipal bond market gained ground during the reporting period, with the benefit of income augmented by a modest gain in prices. Declining inflation fueled expectations that the U.S. Federal Reserve was set to begin cutting interest rates in 2024, benefiting the broader fixed-income market. Municipal bonds were further helped by positive economic growth, strong issuer fundamentals, and favorable supply-and-demand trends. What contributed to performance? The Fund’s use of U.S. Treasury futures to manage interest-rate risk added to relative performance to the benchmark (65% Bloomberg U.S. Municipal Bond Index/35% Bloomberg Municipal High Yield Bond Index). An overweight in bonds with maturities of 18 to 25 years also contributed, as did large overweights in AA, A, and BBB rated issues. Security selection in the housing, utilities, education, corporate-backed, and school district sectors contributed, as well. The Fund’s use of derivatives marginally contributed to performance. What detracted from performance? An overweight in bonds with maturities of 25 years and above and an underweight in those with maturities of 12 to 18 years detracted from results. Underweights in both AAA-rated and high-yield securities also hurt relative performance. At the sector level, underweights in the transportation, tobacco, and tax-backed state sectors detracted. 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: March 14, 2022 through May 31, 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 Since Class K Shares 5.17 % 1.70 % Bloomberg Municipal Bond Index 2.67 % 0.16 % 65% Bloomberg U.S. Municipal Bond Index/35% Bloomberg Municipal High Yield Bond Index 4.58 % 0.36 % |
| 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. |
| Updated Performance Information Location [Text Block] | Visit blackrock.com |
| Net Assets | $ 48,874,629 |
| Holdings Count | Holding | 82 |
| Advisory Fees Paid, Amount | $ 10,609 |
| Investment Company Portfolio Turnover | 18% |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets $ % Number of Portfolio Holdings $ % Net Investment Advisory Fees $ % Portfolio Turnover Rate $ % |
| Holdings [Text Block] | What did the Fund invest in? (as of May 31, 2024) Sector allocation Sector (a)(b) Percent of Housing 17.7 % Education 17.7 % Transportation 16.7 % Health 12.7 % County/City/Special District/School District 11.6 % Utilities 10.1 % Corporate 9.2 % State 4.3 % Credit quality allocation Credit Rating (a)(c) Percent of AAA/Aaa 6.4 % AA/Aa 52.3 % A 22.2 % BBB/Baa 7.4 % BB/Ba 3.9 % N/R 7.8 % (a) (b) (c) Excludes short-term securities. (a) (b) (c) For purposes of this report, sector sub-classifications may differ from those utilized for compliance purposes. (a) (b) (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. |
| 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. |
| C000234660 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | BlackRock Impact Municipal Fund |
| Class Name | Investor A Shares |
| Trading Symbol | MPDCX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about BlackRock Impact Municipal Fund (the “Fund”) for the period of June 1, 2023 to May 31, 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 . |
| 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 $ 0.81 % |
| Expenses Paid, Amount | $ 83 |
| Expense Ratio, Percent | 0.81% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? The municipal bond market gained ground during the reporting period, with the benefit of income augmented by a modest gain in prices. Declining inflation fueled expectations that the U.S. Federal Reserve was set to begin cutting interest rates in 2024, benefiting the broader fixed-income market. Municipal bonds were further helped by positive economic growth, strong issuer fundamentals, and favorable supply-and-demand trends. What contributed to performance? The Fund’s use of U.S. Treasury futures to manage interest-rate risk added to relative performance to the benchmark (65% Bloomberg U.S. Municipal Bond Index/35% Bloomberg Municipal High Yield Bond Index). An overweight in bonds with maturities of 18 to 25 years also contributed, as did large overweights in AA, A, and BBB rated issues. Security selection in the housing, utilities, education, corporate-backed, and school district sectors contributed, as well. The Fund’s use of derivatives marginally contributed to performance. What detracted from performance? An overweight in bonds with maturities of 25 years and above and an underweight in those with maturities of 12 to 18 years detracted from results. Underweights in both AAA-rated and high-yield securities also hurt relative performance. At the sector level, underweights in the transportation, tobacco, and tax-backed state sectors detracted. 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: March 14, 2022 through May 31, 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 Since Investor A Shares 4.88 % 1.42 ) % Investor A Shares (with sales charge) 0.43 % (0.55 ) % Bloomberg Municipal Bond Index 2.67 % 0.16 ) % 65% Bloomberg U.S. Municipal Bond Index/35% Bloomberg Municipal High Yield Bond Index 4.58 % 0.36 ) % |
| 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. |
| Updated Performance Information Location [Text Block] | Visit blackrock.com |
| Net Assets | $ 48,874,629 |
| Holdings Count | Holding | 82 |
| Advisory Fees Paid, Amount | $ 10,609 |
| Investment Company Portfolio Turnover | 18% |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets $ % Number of Portfolio Holdings $ % Net Investment Advisory Fees $ % Portfolio Turnover Rate $ % |
| Holdings [Text Block] | What did the Fund invest in? (as of May 31, 2024) Sector allocation Sector (a)(b) Percent of Housing 17.7 % Education 17.7 % Transportation 16.7 % Health 12.7 % County/City/Special District/School District 11.6 % Utilities 10.1 % Corporate 9.2 % State 4.3 % Credit quality allocation Credit Rating (a)(c) Percent of AAA/Aaa 6.4 % AA/Aa 52.3 % A 22.2 % BBB/Baa 7.4 % BB/Ba 3.9 % N/R 7.8 % (a) (b) (c) Excludes short-term securities. (a) (b) (c) For purposes of this report, sector sub-classifications may differ from those utilized for compliance purposes. (a) (b) (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. |
| 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. |
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | 27 Months Ended | ||||||||
| May 31, 2024 | May 31, 2024 | Feb. 29, 2024 | Nov. 30, 2023 | Aug. 31, 2023 | May 31, 2023 | Feb. 28, 2023 | Nov. 30, 2022 | Aug. 31, 2022 | May 31, 2022 | |
| C000234661 [Member] | ||||||||||
| Account Value [Line Items] | ||||||||||
| Line Graph and Table Measure Name | Institutional Shares | |||||||||
| Account Value | $ 10,360 | $ 10,360 | $ 10,439 | $ 10,190 | $ 9,898 | $ 9,866 | $ 9,722 | $ 9,612 | $ 9,607 | $ 9,839 |
| Average Annual Return, Percent | 5.01% | 1.61% | ||||||||
| C000234662 [Member] | ||||||||||
| Account Value [Line Items] | ||||||||||
| Line Graph and Table Measure Name | Class K Shares | |||||||||
| Account Value | $ 10,381 | $ 10,381 | 10,459 | 10,208 | 9,904 | 9,870 | 9,736 | 9,615 | 9,609 | 9,840 |
| Average Annual Return, Percent | 5.17% | 1.70% | ||||||||
| C000234660 [Member] | ||||||||||
| Account Value [Line Items] | ||||||||||
| Line Graph and Table Measure Name | Investor A Shares (with sales charge) | |||||||||
| Account Value | $ 9,878 | $ 9,878 | 9,960 | 9,727 | 9,444 | 9,418 | 9,287 | 9,187 | 9,188 | 9,416 |
| Average Annual Return, Percent | 0.43% | (0.55%) | ||||||||
| C000234660 [Member] | Without Sales Load [Member] | ||||||||||
| Account Value [Line Items] | ||||||||||
| Line Graph and Table Measure Name | Investor A Shares | |||||||||
| Average Annual Return, Percent | 4.88% | 1.42% | ||||||||
| Bloomberg Municipal Bond Index [Member] | ||||||||||
| Account Value [Line Items] | ||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | |||||||||
| Account Value | $ 10,035 | $ 10,035 | 10,191 | 9,998 | 9,768 | 9,774 | 9,667 | 9,587 | 9,605 | 9,726 |
| Average Annual Return, Percent | 2.67% | 0.16% | ||||||||
| Sixty Five Bloomberg U S Municipal Bond Index 35 Bloomberg Municipal High Yield Bond Index [Member] | ||||||||||
| Account Value [Line Items] | ||||||||||
| Line Graph and Table Measure Name | 65% Bloomberg U.S. Municipal Bond Index/35% Bloomberg Municipal High Yield Bond Index | |||||||||
| Account Value | $ 10,080 | $ 10,080 | $ 10,135 | $ 9,895 | $ 9,665 | $ 9,639 | $ 9,523 | $ 9,439 | $ 9,541 | $ 9,681 |
| Average Annual Return, Percent | 4.58% | 0.36% |
| Shareholder Report, Holdings (Details) | May 31, 2024 | |
| C000234661 [Member] | N R [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 7.80% | [1],[2] |
| C000234661 [Member] | County City Special District School District [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 11.60% | [1],[3] |
| C000234661 [Member] | State [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 4.30% | [1],[3] |
| C000234661 [Member] | Transportation Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 16.70% | [1],[3] |
| C000234661 [Member] | Utilities Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 10.10% | [1],[3] |
| C000234661 [Member] | Housing [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 17.70% | [1],[3] |
| C000234661 [Member] | Healthcare Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 12.70% | [1],[3] |
| C000234661 [Member] | Education [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 17.70% | [1],[3] |
| C000234661 [Member] | Corporate Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 9.20% | [1],[3] |
| C000234662 [Member] | N R [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 7.80% | [4],[5] |
| C000234662 [Member] | County City Special District School District [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 11.60% | [4],[6] |
| C000234662 [Member] | State [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 4.30% | [4],[6] |
| C000234662 [Member] | Transportation Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 16.70% | [4],[6] |
| C000234662 [Member] | Utilities Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 10.10% | [4],[6] |
| C000234662 [Member] | Housing [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 17.70% | [4],[6] |
| C000234662 [Member] | Healthcare Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 12.70% | [4],[6] |
| C000234662 [Member] | Education [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 17.70% | [4],[6] |
| C000234662 [Member] | Corporate Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 9.20% | [4],[6] |
| C000234660 [Member] | N R [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 7.80% | [7],[8] |
| C000234660 [Member] | County City Special District School District [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 11.60% | [7],[9] |
| C000234660 [Member] | State [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 4.30% | [7],[9] |
| C000234660 [Member] | Transportation Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 16.70% | [7],[9] |
| C000234660 [Member] | Utilities Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 10.10% | [7],[9] |
| C000234660 [Member] | Housing [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 17.70% | [7],[9] |
| C000234660 [Member] | Healthcare Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 12.70% | [7],[9] |
| C000234660 [Member] | Education [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 17.70% | [7],[9] |
| C000234660 [Member] | Corporate Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 9.20% | [7],[9] |
| [1]Excludes short-term securities.[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]For purposes of this report, sector sub-classifications may differ from those utilized for compliance purposes.[4]Excludes short-term securities.[5]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.[6]For purposes of this report, sector sub-classifications may differ from those utilized for compliance purposes.[7]Excludes short-term securities.[8]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.[9]For purposes of this report, sector sub-classifications may differ from those utilized for compliance purposes. | ||
| Label | Element | Value | |
| C000234661 [Member] | Standard & Poor's, AA Rating [Member] | |||
| Percent of Total Investments | oef_PctOfTotalInv | 52.30% | [1],[2] |
| C000234661 [Member] | Standard & Poor's, BB Rating [Member] | |||
| Percent of Total Investments | oef_PctOfTotalInv | 3.90% | [1],[2] |
| C000234661 [Member] | Standard & Poor's, A Rating [Member] | |||
| Percent of Total Investments | oef_PctOfTotalInv | 22.20% | [1],[2] |
| C000234661 [Member] | Standard & Poor's, BBB Rating [Member] | |||
| Percent of Total Investments | oef_PctOfTotalInv | 7.40% | [1],[2] |
| C000234661 [Member] | Standard & Poor's, AAA Rating [Member] | |||
| Percent of Total Investments | oef_PctOfTotalInv | 6.40% | [1],[2] |
| C000234662 [Member] | Standard & Poor's, AA Rating [Member] | |||
| Percent of Total Investments | oef_PctOfTotalInv | 52.30% | [3],[4] |
| C000234662 [Member] | Standard & Poor's, BB Rating [Member] | |||
| Percent of Total Investments | oef_PctOfTotalInv | 3.90% | [3],[4] |
| C000234662 [Member] | Standard & Poor's, A Rating [Member] | |||
| Percent of Total Investments | oef_PctOfTotalInv | 22.20% | [3],[4] |
| C000234662 [Member] | Standard & Poor's, BBB Rating [Member] | |||
| Percent of Total Investments | oef_PctOfTotalInv | 7.40% | [3],[4] |
| C000234662 [Member] | Standard & Poor's, AAA Rating [Member] | |||
| Percent of Total Investments | oef_PctOfTotalInv | 6.40% | [3],[4] |
| C000234660 [Member] | Standard & Poor's, AA Rating [Member] | |||
| Percent of Total Investments | oef_PctOfTotalInv | 52.30% | [5],[6] |
| C000234660 [Member] | Standard & Poor's, BB Rating [Member] | |||
| Percent of Total Investments | oef_PctOfTotalInv | 3.90% | [5],[6] |
| C000234660 [Member] | Standard & Poor's, A Rating [Member] | |||
| Percent of Total Investments | oef_PctOfTotalInv | 22.20% | [5],[6] |
| C000234660 [Member] | Standard & Poor's, BBB Rating [Member] | |||
| Percent of Total Investments | oef_PctOfTotalInv | 7.40% | [5],[6] |
| C000234660 [Member] | Standard & Poor's, AAA Rating [Member] | |||
| Percent of Total Investments | oef_PctOfTotalInv | 6.40% | [5],[6] |
| [1]Excludes short-term securities.[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]Excludes short-term securities.[4]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.[5]Excludes short-term securities.[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. | |||
