| Form N-CSR Cover | 12 Months Ended |
| Aug. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | Prudential National Muni Fund, Inc. |
| Entity Central Index Key | 0000314612 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Aug. 31, 2024 |
| Shareholder Report | 12 Months Ended |
| Aug. 31, 2024 USD ($) Holdings | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | Prudential National Muni Fund, Inc. |
| Entity Central Index Key | 0000314612 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Aug. 31, 2024 |
| PGIM National Muni Fund - Class A | |
| Shareholder Report [Line Items] | |
| Fund Name | PGIM National Muni Fund |
| Class Name | Class A |
| Trading Symbol | PRNMX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Class A shares of PGIM National Muni Fund (the “Fund”) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at pgim.com/investments/mutual-funds/prospectuses-fact-sheets . You can also request this information by contacting us at (800) 225-1852 or (973) 367-3529 from outside the US. |
| Additional Information Phone Number | (800) 225-1852 or (973) 367-3529 |
| Additional Information Website | pgim.com/investments/mutual-funds/prospectuses-fact-sheets |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment PGIM National Muni Fund—Class A $63 0.61% |
| Expenses Paid, Amount | $ 63 |
| Expense Ratio, Percent | 0.61% |
| Factors Affecting Performance [Text Block] | WHAT AFFECTED THE FUND’S PERFORMANCE DURING THE REPORTING PERIOD? ■ During the reporting period, the US Federal Reserve held policy rates steady. Meanwhile, municipal bond issuance picked up in the first half of 2024 due to deferred maintenance and stabilizing project costs amid slowing inflation, moderating economic data, and upcoming elections. Despite downgraded outlooks for California and Maryland, strong fundamentals (e.g., healthy tax collections, robust rainy-day funds, and upgrades that outpaced downgrades) provided a positive backdrop for demand, and spreads tightened. ■ The following contributed most to the Fund’s performance relative to the Index during the reporting period: a significant overweight to the long end of the yield curve (despite front-end rates rallying more than long-end rates and the portfolio’s yield curve flattener positioning), and an overweight to housing bonds, driven by an overweight to Low Income Housing Tax Credit multifamily deals. (A yield curve is a line graph that illustrates the relationship between the yields and maturities of fixed income securities. It is created by plotting the yields of different maturities for the same type of bonds. A yield curve flattener is an interest rate environment in which long-term rates are decreasing more quickly than short-term rates.) ■ The following detracted most from the Fund’s performance relative to the Index during the reporting period: duration positioning as municipal bond rates rallied, overweight positioning in dedicated tax deals driven by Illinois’ Metropolitan Pier and Expo Authority (MPEA), and an overweight position within transportation-airports. (Duration measures the sensitivity of the price—the value of principal—of a bond to a change in interest rates.) ■ The Fund uses derivatives when they facilitate implementation of the overall investment approach. During the reporting period, the Fund used futures to help manage duration positioning and yield curve exposure. The Fund’s positions in futures contributed modestly to performance during the reporting period. |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns as of 8/31/2024 One Year (%) Five Years (%) Ten Years (%) Class A with sales charges 2.21% 0.04% 1.76% Class A without sales charges 5.65% 0.70% 2.10% Bloomberg 1-15 Year Municipal Index 5.17% 1.13% 2.16% Broad-Based Securities Market Index: Bloomberg Municipal Bond Index* 6.09% 1.02% 2.43% *The Fund has added this broad-based index in response to new regulatory requirements. |
| No Deduction of Taxes [Text Block] | The returns do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. |
| Updated Performance Information Location [Text Block] | Visit pgim.com/investments/mutual-funds/prospectuses-fact-sheets or call (800) 225-1852 or (973) 367-3529 from outside the US for more recent performance data. |
| Net Assets | $ 1,064,872,787 |
| Holdings Count | Holdings | 491 |
| Advisory Fees Paid, Amount | $ 2,500,585 |
| Investment Company, Portfolio Turnover | 84% |
| Additional Fund Statistics [Text Block] | WHAT ARE SOME KEY FUND STATISTICS AS OF 8/31/2024? Fund’s net assets $ 1,064,872,787 Number of fund holdings 491 Total advisory fees paid for the year $ 2,500,585 Portfolio turnover rate for the year 84% |
| Holdings [Text Block] | WHAT ARE SOME CHARACTERISTICS OF THE FUND’S HOLDINGS AS OF 8/31/2024? Credit Quality expressed as a percentage of total investments as of 8/31/2024 (%) AAA 11.5 AA 43.3 A 34.1 BBB 6.3 BB 0.2 Not Rated 4.4 Cash/Cash Equivalents 0.2 Total 100.0 |
| Updated Prospectus Phone Number | (800) 225-1852 or (973) 367-3529 |
| Updated Prospectus Web Address | pgim.com/investments/mutual-funds/prospectuses-fact-sheets |
| PGIM National Muni Fund - Class C | |
| Shareholder Report [Line Items] | |
| Fund Name | PGIM National Muni Fund |
| Class Name | Class C |
| Trading Symbol | PNMCX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Class C shares of PGIM National Muni Fund (the “Fund”) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at pgim.com/investments/mutual-funds/prospectuses-fact-sheets . You can also request this information by contacting us at (800) 225-1852 or (973) 367-3529 from outside the US. |
| Additional Information Phone Number | (800) 225-1852 or (973) 367-3529 |
| Additional Information Website | pgim.com/investments/mutual-funds/prospectuses-fact-sheets |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment PGIM National Muni Fund—Class C $157 1.53% |
| Expenses Paid, Amount | $ 157 |
| Expense Ratio, Percent | 1.53% |
| Factors Affecting Performance [Text Block] | WHAT AFFECTED THE FUND’S PERFORMANCE DURING THE REPORTING PERIOD? ■ During the reporting period, the US Federal Reserve held policy rates steady. Meanwhile, municipal bond issuance picked up in the first half of 2024 due to deferred maintenance and stabilizing project costs amid slowing inflation, moderating economic data, and upcoming elections. Despite downgraded outlooks for California and Maryland, strong fundamentals (e.g., healthy tax collections, robust rainy-day funds, and upgrades that outpaced downgrades) provided a positive backdrop for demand, and spreads tightened. ■ The following contributed most to the Fund’s performance relative to the Index during the reporting period: a significant overweight to the long end of the yield curve (despite front-end rates rallying more than long-end rates and the portfolio’s yield curve flattener positioning), and an overweight to housing bonds, driven by an overweight to Low Income Housing Tax Credit multifamily deals. (A yield curve is a line graph that illustrates the relationship between the yields and maturities of fixed income securities. It is created by plotting the yields of different maturities for the same type of bonds. A yield curve flattener is an interest rate environment in which long-term rates are decreasing more quickly than short-term rates.) ■ The following detracted most from the Fund’s performance relative to the Index during the reporting period: duration positioning as municipal bond rates rallied, overweight positioning in dedicated tax deals driven by Illinois’ Metropolitan Pier and Expo Authority (MPEA), and an overweight position within transportation-airports. (Duration measures the sensitivity of the price—the value of principal—of a bond to a change in interest rates.) ■ The Fund uses derivatives when they facilitate implementation of the overall investment approach. During the reporting period, the Fund used futures to help manage duration positioning and yield curve exposure. The Fund’s positions in futures contributed modestly to performance during the reporting period. |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns as of 8/31/2024 One Year (%) Five Years (%) Ten Years (%) Class C with sales charges 3.68% -0.16% 1.26% Class C without sales charges 4.68% -0.16% 1.26% Bloomberg 1-15 Year Municipal Index 5.17% 1.13% 2.16% Broad-Based Securities Market Index: Bloomberg Municipal Bond Index* 6.09% 1.02% 2.43% *The Fund has added this broad-based index in response to new regulatory requirements |
| No Deduction of Taxes [Text Block] | The returns do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. |
| Updated Performance Information Location [Text Block] | Visit pgim.com/investments/mutual-funds/prospectuses-fact-sheets or call (800) 225-1852 or (973) 367-3529 from outside the US for more recent performance data. |
| Net Assets | $ 1,064,872,787 |
| Holdings Count | Holdings | 491 |
| Advisory Fees Paid, Amount | $ 2,500,585 |
| Investment Company, Portfolio Turnover | 84% |
| Additional Fund Statistics [Text Block] | WHAT ARE SOME KEY FUND STATISTICS AS OF 8/31/2024? Fund’s net assets $ 1,064,872,787 Number of fund holdings 491 Total advisory fees paid for the year $ 2,500,585 Portfolio turnover rate for the year 84% |
| Holdings [Text Block] | WHAT ARE SOME CHARACTERISTICS OF THE FUND’S HOLDINGS AS OF 8/31/2024? Credit Quality expressed as a percentage of total investments as of 8/31/2024 (%) AAA 11.5 AA 43.3 A 34.1 BBB 6.3 BB 0.2 Not Rated 4.4 Cash/Cash Equivalents 0.2 Total 100.0 |
| Updated Prospectus Phone Number | (800) 225-1852 or (973) 367-3529 |
| Updated Prospectus Web Address | pgim.com/investments/mutual-funds/prospectuses-fact-sheets |
| PGIM National Muni Fund - Class Z | |
| Shareholder Report [Line Items] | |
| Fund Name | PGIM National Muni Fund |
| Class Name | Class Z |
| Trading Symbol | DNMZX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Class Z shares of PGIM National Muni Fund (the “Fund”) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at pgim.com/investments/mutual-funds/prospectuses-fact-sheets . You can also request this information by contacting us at (800) 225-1852 or (973) 367-3529 from outside the US. |
| Additional Information Phone Number | (800) 225-1852 or (973) 367-3529 |
| Additional Information Website | pgim.com/investments/mutual-funds/prospectuses-fact-sheets |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment PGIM National Muni Fund—Class Z $37 0.36% |
| Expenses Paid, Amount | $ 37 |
| Expense Ratio, Percent | 0.36% |
| Factors Affecting Performance [Text Block] | WHAT AFFECTED THE FUND’S PERFORMANCE DURING THE REPORTING PERIOD? ■ During the reporting period, the US Federal Reserve held policy rates steady. Meanwhile, municipal bond issuance picked up in the first half of 2024 due to deferred maintenance and stabilizing project costs amid slowing inflation, moderating economic data, and upcoming elections. Despite downgraded outlooks for California and Maryland, strong fundamentals (e.g., healthy tax collections, robust rainy-day funds, and upgrades that outpaced downgrades) provided a positive backdrop for demand, and spreads tightened. ■ The following contributed most to the Fund’s performance relative to the Index during the reporting period: a significant overweight to the long end of the yield curve (despite front-end rates rallying more than long-end rates and the portfolio’s yield curve flattener positioning), and an overweight to housing bonds, driven by an overweight to Low Income Housing Tax Credit multifamily deals. (A yield curve is a line graph that illustrates the relationship between the yields and maturities of fixed income securities. It is created by plotting the yields of different maturities for the same type of bonds. A yield curve flattener is an interest rate environment in which long-term rates are decreasing more quickly than short-term rates.) ■ The following detracted most from the Fund’s performance relative to the Index during the reporting period: duration positioning as municipal bond rates rallied, overweight positioning in dedicated tax deals driven by Illinois’ Metropolitan Pier and Expo Authority (MPEA), and an overweight position within transportation-airports. (Duration measures the sensitivity of the price—the value of principal—of a bond to a change in interest rates.) ■ The Fund uses derivatives when they facilitate implementation of the overall investment approach. During the reporting period, the Fund used futures to help manage duration positioning and yield curve exposure. The Fund’s positions in futures contributed modestly to performance during the reporting period. |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns as of 8/31/2024 One Year (%) Five Years (%) Ten Years (%) Class Z 5.99% 0.97% 2.35% Bloomberg 1-15 Year Municipal Index 5.17% 1.13% 2.16% Broad-Based Securities Market Index: Bloomberg Municipal Bond Index* 6.09% 1.02% 2.43% *The Fund has added this broad-based index in response to new regulatory requirements |
| No Deduction of Taxes [Text Block] | The returns do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. |
| Updated Performance Information Location [Text Block] | Visit pgim.com/investments/mutual-funds/prospectuses-fact-sheets or call (800) 225-1852 or (973) 367-3529 from outside the US for more recent performance data. |
| Net Assets | $ 1,064,872,787 |
| Holdings Count | Holdings | 491 |
| Advisory Fees Paid, Amount | $ 2,500,585 |
| Investment Company, Portfolio Turnover | 84% |
| Additional Fund Statistics [Text Block] | WHAT ARE SOME KEY FUND STATISTICS AS OF 8/31/2024? Fund’s net assets $ 1,064,872,787 Number of fund holdings 491 Total advisory fees paid for the year $ 2,500,585 Portfolio turnover rate for the year 84% |
| Holdings [Text Block] | WHAT ARE SOME CHARACTERISTICS OF THE FUND’S HOLDINGS AS OF 8/31/2024? Credit Quality expressed as a percentage of total investments as of 8/31/2024 (%) AAA 11.5 AA 43.3 A 34.1 BBB 6.3 BB 0.2 Not Rated 4.4 Cash/Cash Equivalents 0.2 Total 100.0 |
| Updated Prospectus Phone Number | (800) 225-1852 or (973) 367-3529 |
| Updated Prospectus Web Address | pgim.com/investments/mutual-funds/prospectuses-fact-sheets |
| PGIM National Muni Fund - Class R6 | |
| Shareholder Report [Line Items] | |
| Fund Name | PGIM National Muni Fund |
| Class Name | Class R6 |
| Trading Symbol | PNMQX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at pgim.com/investments/mutual-funds/prospectuses-fact-sheets . You can also request this information by contacting us at (800) 225-1852 or (973) 367-3529 from outside the US. |
| Additional Information Phone Number | (800) 225-1852 or (973) 367-3529 |
| Additional Information Website | pgim.com/investments/mutual-funds/prospectuses-fact-sheets |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (Based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment PGIM National Muni Fund—Class R6 $30 0.29% |
| Expenses Paid, Amount | $ 30 |
| Expense Ratio, Percent | 0.29% |
| Factors Affecting Performance [Text Block] | WHAT AFFECTED THE FUND’S PERFORMANCE DURING THE REPORTING PERIOD? ■ During the reporting period, the US Federal Reserve held policy rates steady. Meanwhile, municipal bond issuance picked up in the first half of 2024 due to deferred maintenance and stabilizing project costs amid slowing inflation, moderating economic data, and upcoming elections. Despite downgraded outlooks for California and Maryland, strong fundamentals (e.g., healthy tax collections, robust rainy-day funds, and upgrades that outpaced downgrades) provided a positive backdrop for demand, and spreads tightened. ■ The following contributed most to the Fund’s performance relative to the Index during the reporting period: a significant overweight to the long end of the yield curve (despite front-end rates rallying more than long-end rates and the portfolio’s yield curve flattener positioning), and an overweight to housing bonds, driven by an overweight to Low Income Housing Tax Credit multifamily deals. (A yield curve is a line graph that illustrates the relationship between the yields and maturities of fixed income securities. It is created by plotting the yields of different maturities for the same type of bonds. A yield curve flattener is an interest rate environment in which long-term rates are decreasing more quickly than short-term rates.) ■ The following detracted most from the Fund’s performance relative to the Index during the reporting period: duration positioning as municipal bond rates rallied, overweight positioning in dedicated tax deals driven by Illinois’ Metropolitan Pier and Expo Authority (MPEA), and an overweight position within transportation-airports. (Duration measures the sensitivity of the price—the value of principal—of a bond to a change in interest rates.) ■ The Fund uses derivatives when they facilitate implementation of the overall investment approach. During the reporting period, the Fund used futures to help manage duration positioning and yield curve exposure. The Fund’s positions in futures contributed modestly to performance during the reporting period. |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns as of 8/31/2024 One Year (%) Five Years (%) Since Inception (%) Class R6 5.99% 1.03% 2.17% (12/4/2017) Bloomberg 1-15 Year Municipal Index 5.17% 1.13% 2.13% Broad-Based Securities Market Index: Bloomberg Municipal Bond Index* 6.09% 1.02% 2.21% *The Fund has added this broad-based index in response to new regulatory requirements. |
| Performance Inception Date | Dec. 04, 2017 |
| No Deduction of Taxes [Text Block] | The returns do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. |
| Updated Performance Information Location [Text Block] | Visit pgim.com/investments/mutual-funds/prospectuses-fact-sheets or call (800) 225-1852 or (973) 367-3529 from outside the US for more recent performance data. |
| Net Assets | $ 1,064,872,787 |
| Holdings Count | Holdings | 491 |
| Advisory Fees Paid, Amount | $ 2,500,585 |
| Investment Company, Portfolio Turnover | 84% |
| Additional Fund Statistics [Text Block] | WHAT ARE SOME KEY FUND STATISTICS AS OF 8/31/2024? Fund’s net assets $ 1,064,872,787 Number of fund holdings 491 Total advisory fees paid for the year $ 2,500,585 Portfolio turnover rate for the year 84% |
| Holdings [Text Block] | WHAT ARE SOME CHARACTERISTICS OF THE FUND’S HOLDINGS AS OF 8/31/2024? Credit Quality expressed as a percentage of total investments as of 8/31/2024 (%) AAA 11.5 AA 43.3 A 34.1 BBB 6.3 BB 0.2 Not Rated 4.4 Cash/Cash Equivalents 0.2 Total 100.0 |
| Updated Prospectus Phone Number | (800) 225-1852 or (973) 367-3529 |
| Updated Prospectus Web Address | pgim.com/investments/mutual-funds/prospectuses-fact-sheets |
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | ||||||||||||
| Aug. 31, 2024 | Aug. 31, 2023 | Aug. 31, 2022 | Aug. 31, 2021 | Aug. 31, 2020 | Aug. 31, 2019 | Aug. 31, 2018 | Dec. 04, 2017 | Aug. 31, 2017 | Aug. 31, 2016 | Aug. 31, 2015 | Aug. 31, 2014 | ||
| PGIM National Muni Fund - Class R6 | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Class R6 | ||||||||||||
| Account Value | $ 11,557.98 | $ 10,904.93 | $ 10,679.35 | $ 11,635.01 | $ 11,197.67 | $ 10,982.62 | $ 10,130.74 | $ 10,000 | |||||
| PGIM National Muni Fund - Class Z | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Class Z | ||||||||||||
| Account Value | $ 12,610.36 | 11,897.56 | 11,668.20 | 12,721.34 | 12,251.70 | 12,015.76 | 11,098.56 | $ 11,003.45 | $ 10,976.75 | $ 10,219.37 | $ 10,000 | ||
| PGIM National Muni Fund - Class C | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Class C with sales charges | ||||||||||||
| Account Value | $ 11,336.93 | 10,830.34 | 10,734.52 | 11,836.97 | 11,525.17 | 11,425.66 | 10,657.61 | 10,678.27 | 10,755.76 | 10,112.60 | 10,000 | ||
| PGIM National Muni Fund - Class A | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Class A with sales charges | ||||||||||||
| Account Value | $ 11,905.98 | 11,269.37 | 11,072.66 | 12,109.71 | 11,691.72 | 11,495.71 | 10,634.78 | 10,573.05 | 10,567.15 | 9,863.03 | 9,675.16 | ||
| Bloomberg Municipal Bond Index [Member] | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||
| Account Value | [1] | $ 12,708.45 | 11,979.06 | 11,778.33 | 12,891.15 | 12,467.75 | 12,077.01 | 11,108.36 | 11,054.45 | 10,957.64 | 10,252.46 | 10,000 | |
| Bloomberg 1-15 Year Municipal Index [Member] | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Bloomberg 1-15 Year Municipal Index | ||||||||||||
| Account Value | $ 12,379.93 | $ 11,771.24 | $ 11,577.25 | $ 12,393.81 | $ 12,087.73 | $ 11,706 | $ 10,872.43 | $ 10,860.29 | $ 10,744.73 | $ 10,188.44 | $ 10,000 | ||
| [1]The Fund has added this broad-based index in response to new regulatory requirements. | |||||||||||||
| Shareholder Report, Average Annual Return (Details) | 12 Months Ended | 60 Months Ended | 81 Months Ended | 120 Months Ended | |
| Aug. 31, 2024 | Aug. 31, 2024 | Aug. 31, 2024 | Aug. 31, 2024 | ||
| PGIM National Muni Fund - Class R6 | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Class R6 | ||||
| Average Annual Return, Percent | 5.99% | 1.03% | 2.17% | ||
| PGIM National Muni Fund - Class Z | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Class Z | ||||
| Average Annual Return, Percent | 5.99% | 0.97% | 2.35% | ||
| PGIM National Muni Fund - Class C | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Class C with sales charges | ||||
| Average Annual Return, Percent | 3.68% | (0.16%) | 1.26% | ||
| PGIM National Muni Fund - Class A | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Class A with sales charges | ||||
| Average Annual Return, Percent | 2.21% | 0.04% | 1.76% | ||
| Without Sales Load [Member] | PGIM National Muni Fund - Class C | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Class C without sales charges | ||||
| Average Annual Return, Percent | 4.68% | (0.16%) | 1.26% | ||
| Without Sales Load [Member] | PGIM National Muni Fund - Class A | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Class A without sales charges | ||||
| Average Annual Return, Percent | 5.65% | 0.70% | 2.10% | ||
| Bloomberg Municipal Bond Index [Member] | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||
| Average Annual Return, Percent | [1] | 6.09% | 1.02% | 2.21% | 2.43% |
| Bloomberg 1-15 Year Municipal Index [Member] | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Bloomberg 1-15 Year Municipal Index | ||||
| Average Annual Return, Percent | 5.17% | 1.13% | 2.13% | 2.16% | |
| [1]The Fund has added this broad-based index in response to new regulatory requirements. | |||||
| Shareholder Report, Holdings (Details) | Aug. 31, 2024 |
| PGIM National Muni Fund - Class A | |
| Holdings [Line Items] | |
| Percent of Total Investments | 100% |
| PGIM National Muni Fund - Class A | AAA [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.50% |
| PGIM National Muni Fund - Class A | AA [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 43.30% |
| PGIM National Muni Fund - Class A | A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 34.10% |
| PGIM National Muni Fund - Class A | BBB [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.30% |
| PGIM National Muni Fund - Class A | BB [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| PGIM National Muni Fund - Class A | Not Rated [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| PGIM National Muni Fund - Class A | Cash/Cash Equivalents [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| PGIM National Muni Fund - Class C | |
| Holdings [Line Items] | |
| Percent of Total Investments | 100% |
| PGIM National Muni Fund - Class C | AAA [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.50% |
| PGIM National Muni Fund - Class C | AA [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 43.30% |
| PGIM National Muni Fund - Class C | A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 34.10% |
| PGIM National Muni Fund - Class C | BBB [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.30% |
| PGIM National Muni Fund - Class C | BB [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| PGIM National Muni Fund - Class C | Not Rated [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| PGIM National Muni Fund - Class C | Cash/Cash Equivalents [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| PGIM National Muni Fund - Class Z | |
| Holdings [Line Items] | |
| Percent of Total Investments | 100% |
| PGIM National Muni Fund - Class Z | AAA [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.50% |
| PGIM National Muni Fund - Class Z | AA [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 43.30% |
| PGIM National Muni Fund - Class Z | A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 34.10% |
| PGIM National Muni Fund - Class Z | BBB [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.30% |
| PGIM National Muni Fund - Class Z | BB [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| PGIM National Muni Fund - Class Z | Not Rated [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| PGIM National Muni Fund - Class Z | Cash/Cash Equivalents [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| PGIM National Muni Fund - Class R6 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 100% |
| PGIM National Muni Fund - Class R6 | AAA [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.50% |
| PGIM National Muni Fund - Class R6 | AA [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 43.30% |
| PGIM National Muni Fund - Class R6 | A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 34.10% |
| PGIM National Muni Fund - Class R6 | BBB [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.30% |
| PGIM National Muni Fund - Class R6 | BB [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| PGIM National Muni Fund - Class R6 | Not Rated [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| PGIM National Muni Fund - Class R6 | Cash/Cash Equivalents [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
