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Risk Return Abstract rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName Prudential National Muni Fund, Inc.
Prospectus Date rr_ProspectusDate Oct. 30, 2023
PGIM National Muni Fund  
Risk Return Abstract rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading <span style="color:#545454;font-family:Arial;font-size:13.58pt;">FUND SUMMARY</span>
Objective [Heading] rr_ObjectiveHeading <span style="color:#000000;font-family:Arial;font-size:9.70pt;font-weight:bold;text-transform:uppercase;">INVESTMENT OBJECTIVE</span>
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The investment objective of the Fund is to seek a high level of current income exempt from federal income taxes.
Expense [Heading] rr_ExpenseHeading <span style="color:#000000;font-family:Arial;font-size:9.70pt;font-weight:bold;text-transform:uppercase;">FUND FEES AND EXPENSES</span>
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The tables below describe the sales charges, fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may be required to pay commissions to a broker for transactions in Class Z shares, which are not reflected in the table or the example below.You may qualify for sales charge discounts if you and an eligible group of related investors purchase, or agree to purchase in the future, $100,000 or more in shares of the Fund or other funds in the PGIM Funds family. More information about these discounts as well as other waivers or discounts is available from your financial professional and is explained in Reducing or Waiving Class A's and Class C’s Sales Charges on page 29 of the Fund's Prospectus, Appendix A: Waivers and Discounts Available From Certain Financial Intermediaries on page 48 of the Fund's Prospectus and in Rights of Accumulation on page 51 of the Fund's Statement of Additional Information (“SAI”).
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption <span style="color:#000000;font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:3pt;">Shareholder Fees (fees paid directly from your investment)</span>
Operating Expenses Caption [Text] rr_OperatingExpensesCaption <span style="color:#000000;font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:3pt;">Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)</span>
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination <span style="font-family:Arial Narrow;font-size:8pt;">December 31, </span><span style="font-family:Arial Narrow;font-size:8pt;">2024</span>
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading <span style="font-family:Arial;font-size:9.70pt;font-weight:bold;">Portfolio Turnover. </span>
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs  and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the Fund's most recent fiscal year, the Fund's portfolio turnover rate was 57% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 57.00%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Investors who purchase $500,000 or more of Class A shares and sell these shares within 12 months of purchase are subject to a contingent deferred sales charge (“CDSC”) of 1.00%, although they are not subject to an initial sales charge. The CDSC is waived for certain retirement and/or benefit plans.Class C shares are sold with a CDSC of 1.00% on sales made within 12 months of purchase.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts <span style="color:#000000;font-family:Arial;font-size:9.70pt;">You may qualify for sales charge discounts if you and an eligible group of related investors purchase, or agree to purchase in the future, </span><span style="color:#000000;font-family:Arial;font-size:9.70pt;">$100,000</span><span style="color:#000000;font-family:Arial;font-size:9.70pt;"> or more in shares of the Fund or other funds in the PGIM Funds family.</span>
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example [Heading] rr_ExpenseExampleHeading <span style="color:#000000;font-family:Arial;font-size:9.70pt;font-weight:bold;">Example. </span>
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The following hypothetical example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. It assumes that you invest $10,000 in the Fund for the time periods indicated and then, except as indicated, redeem all your shares at the end of those periods. It assumes a 5% return on your investment each year, that the Fund's operating expenses remain the same (except that fee waivers or reimbursements, if any, are only reflected in the 1-Year figures) and that all dividends and distributions are reinvested. Your actual costs may be higher or lower.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption <span style="color:#000000;font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:3pt;">If Shares Are Redeemed</span>
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption <span style="color:#000000;font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:3pt;">If Shares Are Not Redeemed</span>
Strategy [Heading] rr_StrategyHeading <span style="color:#000000;font-family:Arial;font-size:9.70pt;font-weight:bold;text-transform:uppercase;">INVESTMENTS, RISKS AND PERFORMANCE</span><span style="color:#000000;font-family:Arial;font-size:9.70pt;font-weight:bold;">Principal Investment Strategies. </span>
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The Fund invests, under normal circumstances, at least 80% of its investable assets in obligations the income from which is exempt from federal income tax, that is, municipal obligations. The term “investable assets” in this prospectus refers to the Fund’s net assets plus any borrowings for investment purposes. The Fund’s investable assets will be less than its total assets to the extent that it has borrowed money for non-investment purposes, such as to meet anticipated redemptions.The Fund’s investments permitted by this policy may include certain municipal bonds, the interest on which is subject to the federal alternative minimum tax (“AMT”). The Fund, under normal conditions, invests at least 70% of its investable assets in “investment grade” municipal debt obligations. Investment grade municipal debt obligations are bonds rated Baa3 or higher by Moody's Investors Service, Inc. (“Moody's”), or BBB- or higher by S&P Global Ratings (“S&P”), or comparably rated by another nationally recognized statistical rating organization (“NRSRO”), and unrated debt obligations that the subadviser believes are comparable in quality. The Fund, under normal conditions, may also invest up to 30% of its investable assets in high yield municipal debt obligations or junk bonds. High yield or junk bonds are rated below Baa3 by Moody's and below BBB- by S&P, or comparably rated by another NRSRO, and are considered speculative. The Fund may invest in obligations the interest and/or principal payments on which are insured by the bond insurers or other parties.In seeking to achieve the Fund’s investment objective, the subadviser will purchase securities that it believes represent the best values based on yield, maturity, issue, potential for price appreciation, risk, quality characteristics and expectations regarding economic and political developments, including movements in interest rates and demand for municipal bonds.Although the Fund may invest in instruments of any duration or maturity, the Fund, under normal conditions, seeks to maintain a weighted average portfolio duration of six years or less. The Fund's weighted average portfolio duration, however, may be longer at any time or from time to time depending on market conditions.In managing the Fund’s assets, the subadviser uses a combination of top-down economic analysis and bottom-up research in conjunction with proprietary quantitative models and risk management systems. In the top-down economic analysis, the subadviser develops views on economic, policy and market trends. In its bottom-up research, the subadviser develops an internal rating and outlook on issuers. The rating and outlook are determined based on a thorough review of the financial health and trends of the issuer. The subadviser may also consider investment factors such as expected total return, yield, spread and potential for price appreciation as well as credit quality, maturity and risk.
Risk [Heading] rr_RiskHeading <span style="color:#000000;font-family:Arial;font-size:9.70pt;font-weight:bold;">Principal Risks. </span>
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading <span style="color:#000000;font-family:Arial;font-size:9.70pt;font-weight:bold;">Performance.</span>
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following bar chart shows the Fund's performance for Class Z shares for each full calendar year of operations or for the last 10 calendar years, whichever is shorter. The following table shows the Fund's average annual returns and also compares the Fund’s performance with the average annual total returns of an index or other benchmark. The bar chart and table demonstrate the risk of investing in the Fund by showing how returns can change from year to year.Past performance (before and after taxes) does not mean that the Fund will achieve similar results in the future.Without the management fee waiver and/or expense reimbursement, if any, the annual total returns would have been lower. Updated Fund performance information, including current net asset value, is available online at www.pgim.com/investments.The Fund’s total returns prior to April 1, 2020 as reflected in the bar chart and the table are the returns of the Fund when it followed different investment strategies.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns <span style="color:#000000;font-family:Arial;font-size:9.70pt;">The following table shows the Fund's average annual </span><span style="color:#000000;font-family:Arial;font-size:9.70pt;">returns and also compares the Fund’s performance with the average annual total returns of an index or other benchmark. The bar chart and table demonstrate the risk of investing in the Fund by showing how returns can change from year to year.</span>
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress <span style="color:#000000;font-family:Arial;font-size:9.70pt;">www.pgim.com/investments</span>
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture <span style="color:#000000;font-family:Arial;font-size:9.70pt;">Past performance (before and after taxes) does not mean that the Fund will achieve similar results in the future.</span>
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns (Class Z Shares)1
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Best Quarter:Worst Quarter:4.17%1st Quarter 2014-6.12%1st Quarter 20221 The total return for Class Z shares from January 1, 2023 toSeptember 30, 2023was0.10%
Performance Table Heading rr_PerformanceTableHeading <span style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:3pt;">Average Annual Total Returns % (including sales charges) (as of 12-31-</span><span style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;">22)</span>
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate <span style="color:#000000;font-family:Arial Narrow;font-size:8pt;">After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.</span>
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred <span style="color:#000000;font-family:Arial Narrow;font-size:8pt;">After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred </span><span style="color:#000000;font-family:Arial Narrow;font-size:8pt;">arrangements, such as 401(k) plans or individual retirement accounts.</span>
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown <span style="color:#000000;font-family:Arial Narrow;font-size:8pt;">After-tax returns are shown only for Class Z shares. After-tax returns for other classes will vary due to differing sales charges and expenses.</span>
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock ° After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.After-tax returns are shown only for Class Z shares. After-tax returns for other classes will vary due to differing sales charges and expenses.
PGIM National Muni Fund | Risk Lose Money [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.
PGIM National Muni Fund | Risk Not Insured Depository Institution [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not guaranteed to achieve its investment objective; is not a deposit with a bank; and is not insured, endorsed or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PGIM National Muni Fund | Credit Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Credit Risk. This is the risk that the issuer, the guarantor, or the insurer of a fixed income security, or the counterparty to a contract may be unable or unwilling to make timely principal and interest payments or to otherwise honor its obligations. Additionally, fixed income securities could lose value due to a loss of confidence in the ability of the issuer, guarantor, insurer, or counterparty to pay back debt. The lower the credit quality of a bond, the more sensitive it is to credit risk.
PGIM National Muni Fund | Debt Obligations Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Debt Obligations Risk. Debt obligations are subject to credit risk, market risk and interest rate risk. The Fund's holdings, share price, yield and total return may also fluctuate in response to bond market movements. The value of bonds may decline for issuer-related reasons, including management performance, financial leverage and reduced demand for the issuer’s goods and services. Certain types of fixed income obligations also may be subject to “call and redemption risk,”which is the risk that the issuer may call a bond held by the Fund for redemption before it matures and the Fund may not be able to reinvest at the same rate of interest and therefore would earn less income.
PGIM National Muni Fund | Economic And Market Events Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Economic and Market Events Risk. Events in the U.S. and global financial markets, including actions taken by the U.S. Federal Reserve or foreign central banks to stimulate or stabilize economic growth or the functioning of the securities markets, or otherwise reduce inflation, may at times result in unusually high market volatility, which could negatively impact performance. Governmental efforts to curb inflation often have negative effects on the level of economic activity. Relatively reduced liquidity in credit and fixed income markets could adversely affect issuers worldwide.
PGIM National Muni Fund | Increase In Expenses Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Increase in Expenses Risk. Your actual cost of investing in the Fund may be higher than the expenses shown in the expense table for a variety of reasons. For example, expense ratios may be higher than those shown if average net assets decrease. Net assets are more likely to decrease and Fund expense ratios are more likely to increase when markets are volatile. Active and frequent trading of Fund securities can increase expenses.
PGIM National Muni Fund | Insured Municipal Bonds Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Insured Municipal Bonds Risk. The Fund may purchase municipal bonds that are insured to attempt to reduce credit risk. Although insurance coverage reduces credit risk by providing that the insurer will make timely payment of interest and/or principal, it does not provide protection against market fluctuations of insured bonds or fluctuations in the price of the shares of the Fund. An insured municipal bond fluctuates in value largely based on factors relating to the insurer's creditworthiness or ability to satisfy its obligations. The Fund cannot be certain that any insurance company will make the payments it guarantees.
PGIM National Muni Fund | Interest Rate Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Interest Rate Risk. The value of your investment may go down when interest rates rise. A rise in rates tends to have a greater impact on the prices of longer term or duration debt securities. Similarly, a rise in interest rates may also have a greater negative impact on the value of equity securities whose issuers expect earnings further out in the future. For example, a fixed income security with a duration of three years is expected to decrease in value by approximately 3% if interest rates increase by 1%. This is referred to as “duration risk.” When interest rates fall, the issuers of debt obligations may prepay principal more quickly than expected, and the Fund may be required to reinvest the proceeds at a lower interest rate. This is referred to as “prepayment risk.” When interest rates rise, debt obligations may be repaid more slowly than expected, and the value of the Fund's holdings may fall sharply. This is referred to as “extension risk.”The Fund may lose money if short-term or long-term interest rates rise sharply or in a manner not anticipated by the subadviser.
PGIM National Muni Fund | Junk Bonds Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Junk Bonds Risk. High-yield, high-risk bonds have predominantly speculative characteristics, including particularly high credit risk. Junk bonds tend to have lower market liquidity than higher-rated securities. The liquidity of particular issuers or industries within a particular investment category may shrink or disappear suddenly and without warning. The non-investment grade bond market can experience sudden and sharp price swings and become illiquid due to a variety of factors, including changes in economic forecasts, stock market activity, large sustained sales by major investors, a high profile default or a change in the market's psychology.
PGIM National Muni Fund | Large Shareholder And Large Scale Redemption Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Large Shareholder and Large Scale Redemption Risk. Certain individuals, accounts, funds (including funds affiliated with the Manager) or institutions, including the Manager and its affiliates, may from time to time own or control a substantial amount of the Fund’s shares. There is no requirement that these entities maintain their investment in the Fund. There is a risk that such large shareholders or that the Fund’s shareholders generally may redeem all or a substantial portion of their investments in the Fund in a short period of time, which could have a significant negative impact on the Fund’s NAV, liquidity, and brokerage costs. Large redemptions could also result in tax consequences to shareholders and impact the Fund’s ability to implement its investment strategy. The Fund’s ability to pursue its investment objective after one or more large scale redemptions may be impaired and, as a result, the Fund may invest a larger portion of its assets in cash or cash equivalents.
PGIM National Muni Fund | Liquidity Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Liquidity Risk. Liquidity risk is the risk that the Fund could not meet requests to redeem shares issued by the Fund without significant dilution of remaining investors' interests in the Fund. The Fund may invest in instruments that trade in lower volumes and are more illiquid than other investments. If the Fund is forced to sell these investments to pay redemption proceeds or for other reasons, the Fund may lose money. In addition, when there is no willing buyer and investments cannot be readily sold at the desired time or price, the Fund may have to accept a lower price or may not be able to sell the instrument at all. An inability to sell a portfolio position can adversely affect the Fund's value or prevent the Fund from being able to take advantage of other investment opportunities.
PGIM National Muni Fund | Management Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Management Risk. Actively managed funds are subject to management risk. The subadviser will apply investment techniques and risk analyses in making investment decisions for the Fund, but the subadviser's judgments about the attractiveness, value or market trends affecting a particular security, industry or sector or about market movements may be incorrect. Additionally, the investments selected for the Fund may underperform the markets in general, the Fund's benchmark and other funds with similar investment objectives.
PGIM National Muni Fund | Market Disruption And Geopolitical Risks [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Market Disruption and Geopolitical Risks. Market disruption can be caused by economic, financial or political events and factors, including but not limited to, international wars or conflicts (including Russia’s military invasion of Ukraine), geopolitical developments (including trading and tariff arrangements, sanctions and cybersecurity attacks), instability in regions such as Asia, Eastern Europe and the Middle East, terrorism, natural disasters and public health epidemics (including the outbreak of COVID-19 globally).The extent and duration of such events and resulting market disruptions cannot be predicted, but could be substantial and could magnify the impact of other risks to the Fund. These and other similar events could adversely affect the U.S. and foreign financial markets and lead to increased market volatility, reduced liquidity in the securities markets, significant negative impacts on issuers and the markets for certain securities and commodities and/or government intervention. They may also cause short- or long-term economic uncertainties in the United States and worldwide. As a result, whether or not the Fund invests in securities of issuers located in or with significant exposure to the countries directly affected, the value and liquidity of the Fund’s investments may be negatively impacted. Further, due to closures of certain markets and restrictions on trading certain securities, the value of certain securities held by the Fund could be significantly impacted, which could lead to such securities being valued at zero.COVID-19 and the related governmental and public responses have had, and future public health epidemics may have an impact on the Fund’s investments and net asset value, and have led and may lead to increased market volatility and the potential for illiquidity in certain classes of securities and sectors of the market. Future public health epidemics mayresult in periods of business disruption, business closures, inability to obtain raw materials, supplies and component parts, and reduced or disrupted operations for the issuers in which the Fund invests. The occurrence, reoccurrence and pendency of public health epidemics could adversely affect the economies and financial markets either in specific countries or worldwide.
PGIM National Muni Fund | Market Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Market Risk. Securities markets may be volatile and the market prices of the Fund’s securities may decline. Securities fluctuate in price based on changes in an issuer’s financial condition and overall market and economic conditions. If the market prices of the securities owned by the Fund fall, the value of your investment in the Fund will decline.
PGIM National Muni Fund | Municipal Bonds Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Municipal Bonds Risk. Municipal bonds are subject to credit risk, market risk and interest rate risk. The Fund's holdings, share price, yield and total return may also fluctuate in response to municipal bond market movements. Municipal bonds are also subject to the risk that potential future legislative changes relating to tax or the rights of municipal bond holders, for example in connection with an insolvency, could affect the market for and value of municipal bonds, which may adversely affect the Fund's yield or the value of the Fund's investments in municipal bonds. Certain municipal bonds with principal and interest payments that are made from the revenues of a specific project or facility, and not general tax revenues, may have increased risks. Factors affecting the project or facility, such as local business or economic conditions, could have a significant effect on the project's ability to make payments of principal and interest on these securities. If the Fund invests a substantial amount of its assets in issuers located in a single region, state or city, there is an increased risk that environmental, economic, political and social conditions in those regions will have a significant impact on the Fund's investment performance. For example, municipal securities of a particular state are vulnerable to events adversely affecting that state, including economic, political and regulatory occurrences, court decisions, terrorism, public health epidemics, social unrest and catastrophic natural disasters, such as hurricanes or earthquakes. Many municipal bonds are also subject to prepayment risk, which is the risk that when interest rates fall, issuers may redeem a security by repaying it early, which may reduce the Fund's income if the proceeds are reinvested at a lower interest rate. In addition, income from municipal bonds could be declared taxable because of non-compliant conduct of a bond issuer.
PGIM National Muni Fund | A  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 3.25%
Maximum deferred sales charge (load) (as a percentage of the lower of the original purchase price or the net asset value at redemption) rr_MaximumDeferredSalesChargeOverOther 1.00% [1]
Maximum sales charge (load) imposed on reinvested dividends and other distributions rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption fee rr_RedemptionFeeOverRedemption none
Exchange fee rr_ExchangeFeeOverRedemption none
Maximum account fee (accounts under $10,000) rr_MaximumAccountFee $ 15
Management fee rr_ManagementFeesOverAssets 0.29%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.11%
Total annual Fund operating expenses rr_ExpensesOverAssets 0.65%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.03%)
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.62% [2]
1 Year rr_ExpenseExampleYear01 $ 386
3 Years rr_ExpenseExampleYear03 523
5 Years rr_ExpenseExampleYear05 673
10 Years rr_ExpenseExampleYear10 1,106
1 Year rr_ExpenseExampleNoRedemptionYear01 386
3 Years rr_ExpenseExampleNoRedemptionYear03 523
5 Years rr_ExpenseExampleNoRedemptionYear05 673
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,106
One Year rr_AverageAnnualReturnYear01 (11.24%)
Five Years rr_AverageAnnualReturnYear05 0.019%
Ten Years rr_AverageAnnualReturnYear10 1.38%
PGIM National Muni Fund | C  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the lower of the original purchase price or the net asset value at redemption) rr_MaximumDeferredSalesChargeOverOther 1.00% [3]
Maximum sales charge (load) imposed on reinvested dividends and other distributions rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption fee rr_RedemptionFeeOverRedemption none
Exchange fee rr_ExchangeFeeOverRedemption none
Maximum account fee (accounts under $10,000) rr_MaximumAccountFee $ 15
Management fee rr_ManagementFeesOverAssets 0.29%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.23%
Total annual Fund operating expenses rr_ExpensesOverAssets 1.52%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.03%)
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.49% [2]
1 Year rr_ExpenseExampleYear01 $ 252
3 Years rr_ExpenseExampleYear03 477
5 Years rr_ExpenseExampleYear05 826
10 Years rr_ExpenseExampleYear10 1,575
1 Year rr_ExpenseExampleNoRedemptionYear01 152
3 Years rr_ExpenseExampleNoRedemptionYear03 477
5 Years rr_ExpenseExampleNoRedemptionYear05 826
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,575
One Year rr_AverageAnnualReturnYear01 (9.91%)
Five Years rr_AverageAnnualReturnYear05 0.02%
Ten Years rr_AverageAnnualReturnYear10 0.92%
PGIM National Muni Fund | Z  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the lower of the original purchase price or the net asset value at redemption) rr_MaximumDeferredSalesChargeOverOther none
Maximum sales charge (load) imposed on reinvested dividends and other distributions rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption fee rr_RedemptionFeeOverRedemption none
Exchange fee rr_ExchangeFeeOverRedemption none
Maximum account fee (accounts under $10,000) rr_MaximumAccountFee none [4]
Management fee rr_ManagementFeesOverAssets 0.29%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.15%
Total annual Fund operating expenses rr_ExpensesOverAssets 0.44%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.08%)
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.36% [2]
1 Year rr_ExpenseExampleYear01 $ 37
3 Years rr_ExpenseExampleYear03 133
5 Years rr_ExpenseExampleYear05 238
10 Years rr_ExpenseExampleYear10 547
1 Year rr_ExpenseExampleNoRedemptionYear01 37
3 Years rr_ExpenseExampleNoRedemptionYear03 133
5 Years rr_ExpenseExampleNoRedemptionYear05 238
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 547
2013 rr_AnnualReturn2013 (4.16%)
2014 rr_AnnualReturn2014 10.13%
2015 rr_AnnualReturn2015 3.18%
2016 rr_AnnualReturn2016 0.55%
2017 rr_AnnualReturn2017 5.01%
2018 rr_AnnualReturn2018 0.82%
2019 rr_AnnualReturn2019 7.64%
2020 rr_AnnualReturn2020 4.28%
2021 rr_AnnualReturn2021 1.40%
2022 rr_AnnualReturn2022 (7.97%)
Year to Date Return, Label rr_YearToDateReturnLabel <span style="font-family:Arial Narrow;font-size:5pt;margin-left:0.0pt;position:relative;top:-3.25pt;">1</span><span style="font-family:Arial Narrow;font-size:8pt;margin-left:0.0pt;"> The total return for Class Z shares from January 1, 2023 to</span>
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2023
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 0.10%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel <span style="font-family:Arial;font-size:9.70pt;font-weight:bold;margin-left:0.00pt;">Best Quarter:</span>
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2014
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 4.17%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel <span style="font-family:Arial;font-size:9.70pt;font-weight:bold;margin-left:0.00pt;">Worst Quarter:</span>
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (6.12%)
One Year rr_AverageAnnualReturnYear01 (7.97%)
Five Years rr_AverageAnnualReturnYear05 1.10%
Ten Years rr_AverageAnnualReturnYear10 1.96%
PGIM National Muni Fund | R6  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the lower of the original purchase price or the net asset value at redemption) rr_MaximumDeferredSalesChargeOverOther none
Maximum sales charge (load) imposed on reinvested dividends and other distributions rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption fee rr_RedemptionFeeOverRedemption none
Exchange fee rr_ExchangeFeeOverRedemption none
Maximum account fee (accounts under $10,000) rr_MaximumAccountFee none
Management fee rr_ManagementFeesOverAssets 0.29%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.05%
Total annual Fund operating expenses rr_ExpensesOverAssets 0.34%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%)
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.29% [2]
1 Year rr_ExpenseExampleYear01 $ 30
3 Years rr_ExpenseExampleYear03 104
5 Years rr_ExpenseExampleYear05 186
10 Years rr_ExpenseExampleYear10 426
1 Year rr_ExpenseExampleNoRedemptionYear01 30
3 Years rr_ExpenseExampleNoRedemptionYear03 104
5 Years rr_ExpenseExampleNoRedemptionYear05 186
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 426
One Year rr_AverageAnnualReturnYear01 (7.90%)
Five Years rr_AverageAnnualReturnYear05 1.22%
Ten Years rr_AverageAnnualReturnYear10
SinceInception rr_AverageAnnualReturnSinceInception 1.32%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 12, 2017
PGIM National Muni Fund | Return After Taxes on Distributions | Z  
Risk Return Abstract rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 (7.97%)
Five Years rr_AverageAnnualReturnYear05 1.09%
Ten Years rr_AverageAnnualReturnYear10 1.95%
PGIM National Muni Fund | Return After Taxes on Distributions and Sale of Fund Shares | Z  
Risk Return Abstract rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 (3.86%)
Five Years rr_AverageAnnualReturnYear05 1.51%
Ten Years rr_AverageAnnualReturnYear10 2.27%
PGIM National Muni Fund | Bloomberg 1-15 Year Municipal Index  
Risk Return Abstract rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 (5.95%)
Five Years rr_AverageAnnualReturnYear05 1.44%
Ten Years rr_AverageAnnualReturnYear10 1.95%
SinceInception rr_AverageAnnualReturnSinceInception 1.58% [5]
[1] Investors who purchase $500,000 or more of Class A shares and sell these shares within 12 months of purchase are subject to a contingent deferred sales charge (“CDSC”) of 1.00%, although they are not subject to an initial sales charge. The CDSC is waived for certain retirement and/or benefit plans.
[2] PGIM Investments LLC (“PGIM Investments”) has contractually agreed, through December 31, 2024, to limit Total Annual Fund Operating Expenses after fee waivers and/or expense reimbursements to 0.36% of average daily net assets for Class Z shares and 0.29% of average daily net assets for Class R6 shares. This contractual waiver excludes interest, brokerage, taxes (such as income and foreign withholding taxes, stamp duty and deferred tax expenses), acquired fund fees and expenses, extraordinary expenses, and certain other Fund expenses such as dividend and interest expense and broker charges on short sales. Where applicable, PGIM Investments agrees to waive management fees or shared operating expenses on any share class to the same extent that it waives such expenses on any other share class. In addition, Total Annual Fund Operating Expenses for Class R6 shares will not exceed Total Annual Fund Operating Expenses for Class Z shares. Fees and/or expenses waived and/or reimbursed by PGIM Investments for the purpose of preventing the expenses from exceeding a certain expense ratio limit may be recouped by PGIM Investments within the same fiscal year during which such waiver and/or reimbursement is made if such recoupment can be realized without exceeding the expense limit in effect at the time of the recoupment for that fiscal year. This waiver may not be terminated prior to December 31, 2024 without the prior approval of the Fund's Board of Directors.
[3] Class C shares are sold with a CDSC of 1.00% on sales made within 12 months of purchase.
[4] Direct Transfer Agent Accounts holding under $10,000 of Class Z shares are subject to the $15 fee.
[5] Since Inception returns for the Index are measured from the month-end closest to the inception date for Class R6 shares.