Label	Element	Value
Risk Return Abstract	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	JPMORGAN TRUST I
Prospectus Date	rr_ProspectusDate	Jun. 19, 2023
A C I Shares | JPMorgan High Yield Municipal Fund
Risk Return Abstract	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	<span style="color:#000000;font-family:Arial;font-size:11pt;font-weight:bold;">Class/Ticker: A/JTIAX; C/JTICX; I/JTISX</span>
Objective [Heading]	rr_ObjectiveHeading	<span style="color:#000000;font-family:Arial;font-size:11pt;font-weight:bold;">What is the goal of the Fund?</span>
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks a high level of current income exempt from federal income taxes.
Expense [Heading]	rr_ExpenseHeading	<span style="color:#000000;font-family:Arial;font-size:11pt;font-weight:bold;">Fees and Expenses of the Fund</span>
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	The following tables describe the 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 table and examples below. You may qualify for sales charge discounts on purchases of Class A Shares if you and your family invest, or agree to invest in the future, at least $100,000 in the J.P. Morgan Funds. More information about these and other discounts is available from your financial intermediary and in “Investing with J.P. Morgan Funds — SALES CHARGES AND FINANCIAL INTERMEDIARY COMPENSATION” on page 76 and in “Financial Intermediary-Specific Sales Charge Waivers” in Appendix A of the prospectus and in “PURCHASES, REDEMPTIONS AND EXCHANGES” in Appendix A to Part II of the Statement of Additional Information.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	<span style="color:#FFFFFF;font-family:Arial Narrow;font-size:11pt;font-weight:bold;margin-left:0.0pt;">SHAREHOLDER FEES </span><span style="color:#FFFFFF;font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:0.0pt;">(Fees paid directly from your investment)</span>
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	<span style="color:#FFFFFF;font-family:Arial Narrow;font-size:11pt;font-weight:bold;margin-left:0.0pt;">ANNUAL FUND OPERATING EXPENSES</span><span style="color:#FFFFFF;font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:0.0pt;">(Expenses that you pay each year as a percentage of the value</span><span style="color:#FFFFFF;font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:0.0pt;">of your investment)</span>
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	<span style="font-family:Arial;font-size:8pt;">6/30/</span><span style="font-family:Arial;font-size:8pt;">24</span>
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	<span style="color:#000000;font-family:Arial;font-size:11pt;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 21% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	21.00%
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	<span style="color:#000000;font-family:Arial;font-size:10pt;">You may qualify for sales charge discounts </span><span style="color:#000000;font-family:Arial;font-size:10pt;">on purchases of Class A Shares if you and your family invest, or agree to invest in the future, at least </span><span style="color:#000000;font-family:Arial;font-size:10pt;">$100,000</span><span style="color:#000000;font-family:Arial;font-size:10pt;"> in the J.P. Morgan Funds. </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:11pt;font-weight:bold;">Example</span>
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses are equal to the total annual fund operating expenses after fee waivers and expense reimbursements shown in the fee table through 6/30/24 and total annual fund operating expenses thereafter. Your actual costs may be higher or lower.
Expense Example by, Year, Caption [Text]	rr_ExpenseExampleByYearCaption	<span style="color:#FFFFFF;font-family:Arial Narrow;font-size:11pt;font-weight:bold;margin-left:0.0pt;">IF YOU SELL YOUR SHARES, YOUR COST WOULD BE:</span>
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	<span style="color:#FFFFFF;font-family:Arial Narrow;font-size:11pt;font-weight:bold;margin-left:0.0pt;">IF YOU DO NOT SELL YOUR SHARES, YOUR COST</span><span style="color:#FFFFFF;font-family:Arial Narrow;font-size:11pt;font-weight:bold;margin-left:0.0pt;">WOULD BE:</span>
Strategy [Heading]	rr_StrategyHeading	<span style="color:#000000;font-family:Arial;font-size:11pt;font-weight:bold;">What are the Fund’s main investment strategies?</span>
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal circumstances, the Fund invests at least 80% of its Assets in municipal securities, the income from which is exempt from federal income tax. This is a fundamental policy. For purposes of this policy, “Assets” means net assets, plus the amount of borrowings for investment purposes. Municipal securities are securities issued by or on behalf of states, territories and possessions of the United States, including the District of Columbia, and their respective authorities, political subdivisions, agencies and instrumentalities and other groups with the authority to act for the municipalities, the interest on which is exempt from federal income tax. The securities are issued to raise funds for various public and private purposes. Municipal securities may include, but are not limited to, variable rate demand obligations, short-term municipal notes, municipal bonds, tax exempt commercial paper, private activity and industrial development bonds, tax anticipation notes, and participations in pools of municipal securities.Municipal securities also include instruments evidencing direct ownership of interest payments or principal payments, or both, on municipal securities, such as tender option bonds and participation interests in all or part of specific holdings of municipal obligations, provided that the applicable issuer receives assurances from legal counsel that the interest payable on the securities is exempt from federal income tax. Additionally, municipal securities include all other instruments that directly or indirectly provide economic exposure to income which is derived from municipalities (such as municipal leases). The securities in which the Fund invests may have fixed rates of return or floating or variable rates.The Fund will invest in municipal securities of any maturity. As part of its investments in municipal securities, the Fund will also have the ability to invest up to 100% of the Fund’s total assets in below investment grade or unrated securities. Such securities are also known as “junk bonds,” “high yield bonds” and “non-investment grade bonds.” Junk bonds also include unrated securities that the Fund’s adviser believes to be of comparable quality to debt securities that are rated below investment grade. Junk bonds are also called “high yield bonds” and “non-investment grade bonds.” These securities generally are rated in the fifth or lower rating categories (for example, BB+ or lower by Standard & Poor’s Corporation (S&P) and Ba1 or lower by Moody’s Investors Service, Inc. (Moody’s)). These securities generally offer a higher yield than investment grade securities, but involve a high degree of risk. A security’s quality is determined at the time of purchase and securities that are rated investment grade or the unrated equivalent may be downgraded or decline in credit quality such that subsequently they would be deemed to be below investment grade.The Fund will also invest in investment grade securities. Investment grade securities carry a minimum rating of Baa3, BBB–, or BBB– by Moody’s, S&P, or Fitch Ratings (Fitch), respectively, or the equivalent by another nationally recognized statistical rating organization (NRSRO) or are unrated but deemed by the adviser to be of comparable quality. Under normal market conditions, the Fund intends to invest a significant portion of its Assets in securities rated BBB/BB by S&P and Fitch, Baa/Ba by Moody’s or unrated securities that the adviser deems to be of equivalent quality.The Fund may also invest in common shares or preferred shares of unaffiliated closed-end funds. The Fund generally will limit its investments in a single closed-end fund to 5% of its total assets and in all registered investment companies including closed-end funds (other than money market funds) to 10% of its total assets.The Fund may invest in shares of exchange-traded funds (ETFs). The ETFs in which the Fund may invest include registered investment companies that seek to track the performance of a particular market index or security. These indexes include not only broad-based market indexes but more specific indexes as well, including those relating to particular sectors, markets, regions or industries. Ordinarily, the Fund must limit its investments in any single ETF to 5% of its total assets and in all ETFs and other investment companies to 10% of its total assets. However, the Securities and Exchange Commission (SEC) has issued exemptive orders to many ETFs that currently allow any fund investing in such ETFs to disregard these 5% and 10% limitations. If the Fund invests in ETFs that have received such exemptive orders, it may invest any amount of its total assets in a single ETF or in multiple ETFs, although ordinarily the Fund will limit its investments to no more than 10% of its total assets in a single ETF.The Fund may invest in obligations of the U.S. Treasury, including Treasury bills, bonds and notes. These investments carry different interest rates, maturities and issue dates. The interest on these securities may be exempt from state and local income taxes.Up to 100% of the Fund’s assets may be invested in municipal securities, the interest on which may be subject to the federal alternative minimum tax for individuals.Up to 20% of the Fund’s net assets may be invested in securities subject to federal income tax.The Fund may also invest in zero-coupon securities.The Fund also invests in inverse floaters, auction rate securities and restricted securities.Investment ProcessThe adviser buys and sells securities and investments for the Fund based on its view of individual securities and market sectors. Taking a long-term approach, the adviser primarily looks for individual fixed income investments that it believes will perform well over market cycles. The adviser is value oriented and makes investment decisions after performing a risk/reward analysis that includes an evaluation of interest rate risk, credit risk, duration, liquidity, any security pledge, and a review of the security’s attributes, such as the coupon, maturity, and any redemption and tender provisions. The adviser also factors in the overall investment strategy of the Fund, including its duration and its credit strategy, as well as the adviser’s interest rate outlook. As part of its investment process, the adviser seeks to assess the impact of environmental, social and governance (ESG) factors on certain issuers in the universe in which the Fund may invest. The adviser’s assessment is based on an analysis of key opportunities and risks across industries to seek to identify financially material issues with respect to the Fund’s investments in municipal issues and ascertain key issues that merit engagement with municipal issuers. These assessments may not be conclusive and securities that may be negatively impacted by such factors may be purchased and retained by the Fund while the Fund may divest or not invest in securities that may be positively impacted by such factors.
Risk [Heading]	rr_RiskHeading	<span style="color:#000000;font-family:Arial;font-size:11pt;font-weight:bold;">The Fund’s Main Investment Risks</span>
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	<span style="color:#000000;font-family:Arial;font-size:11pt;font-weight:bold;">The Fund’s Past Performance</span>
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	This section provides some indication of the risks of investing in the Fund. The bar chart shows how the performance of the Fund’s Class I Shares has varied from year to year for the past ten calendar years. The table shows the average annual total returns for the past one year, five years and ten years. The table compares the Fund’s performance to the performance of the Bloomberg US Municipal Index and the Bloomberg High Yield Municipal Bond Index.Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available by visitingwww.jpmorganfunds.com or by calling 1-800-480-4111. Effective November 1, 2018, the Fund’s investment strategies changed. The Fund’s past performance would have been different if the Fund were managed using the current strategies.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	<span style="color:#000000;font-family:Arial;font-size:10pt;">The bar chart shows how the performance of the </span><span style="color:#000000;font-family:Arial;font-size:10pt;">Fund’s Class I Shares has varied from year to year for the past ten calendar years. The table shows the average annual total returns for the past one year, five years and ten years. </span>
Performance Additional Market Index [Text]	rr_PerformanceAdditionalMarketIndex	<span style="color:#000000;font-family:Arial;font-size:10pt;">The table </span><span style="color:#000000;font-family:Arial;font-size:10pt;">compares the Fund’s performance to the performance of the Bloomberg US Municipal Index and the Bloomberg High Yield Municipal Bond Index.</span>
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	<span style="color:#000000;font-family:Arial;font-size:10pt;font-style:italic;">1-800-480-4111</span>
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	<span style="color:#000000;font-family:Arial;font-size:10pt;font-style:italic;">www.jpmorganfunds.com</span>
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	<span style="color:#000000;font-family:Arial;font-size:10pt;">Past performance (before and after taxes) </span><span style="color:#000000;font-family:Arial;font-size:10pt;">is not necessarily an indication of how the Fund will perform in the future. </span>
Bar Chart [Heading]	rr_BarChartHeading	<span style="color:#FFFFFF;font-family:Arial;font-size:10pt;font-weight:bold;margin-left:0.0pt;">YEAR-BY-YEAR RETURNS — CLASS I SHARES</span>
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Best Quarter1st quarter, 20193.81%Worst Quarter1st quarter, 2022-7.16%The Fund’s year-to-date total returnthrough3/31/23was1.94%.
Performance Table Heading	rr_PerformanceTableHeading	<span style="color:#FFFFFF;font-family:Arial Narrow;font-size:11pt;font-weight:bold;margin-left:0.0pt;">AVERAGE ANNUAL TOTAL RETURNS</span><span style="color:#FFFFFF;font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:0.0pt;">(For periods ended December 31, 2022)</span>
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	<span style="color:#000000;font-family:Arial;font-size:10pt;"> After-tax </span><span style="color:#000000;font-family:Arial;font-size:10pt;">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;font-size:10pt;"> Actual after-tax returns depend on the </span><span style="color:#000000;font-family:Arial;font-size:10pt;">investor’s tax situation and may differ from those shown, and the after-tax returns are not relevant to investors who hold their shares through tax-deferred 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;font-size:10pt;">After-tax returns are shown for only the Class I Shares and after-tax returns for the other classes will vary.</span>
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	After-tax returns are shown for only the Class I Shares and after-tax returns for the other classes will vary. 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 the investor’s tax situation and may differ from those shown, and the after-tax returns are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
A C I Shares | JPMorgan High Yield Municipal Fund | Risk Lose Money [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	You could lose money investing in the Fund.
A C I Shares | JPMorgan High Yield Municipal Fund | Risk Not Insured Depository Institution [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Investments in the Fund are not deposits or obligations of, or guaranteed or endorsed by, any bank and are not insured or guaranteed by the FDIC, the Federal Reserve Board or any other government agency.
A C I Shares | JPMorgan High Yield Municipal Fund | Municipal Obligations Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Municipal Obligations Risk. The risk of a municipal obligation generally depends on the financial and credit status of the issuer. Changes in the financial health of a municipal issuer may make it difficult for the issuer to make interest and principal payments when due. This could decrease the Fund’s income or hurt the ability to preserve capital and liquidity.Under some circumstances, municipal obligations might not pay interest unless the state legislature or municipality authorizes money for that purpose.Municipal obligations may be more susceptible to downgrades or defaults during recessions or similar periods of economic stress. In addition, since some municipal obligations may be secured or guaranteed by banks and other institutions, the risk to the Fund could increase if the banking or financial sector suffers an economic downturn and/or if the credit ratings of the institutions issuing the guarantee are downgraded or at risk of being downgraded by a national rating organization. Such a downward revision or risk of being downgraded may have an adverse effect on the market prices of the bonds and thus the value of the Fund’s investments.In addition to being downgraded, an insolvent municipality may file for bankruptcy. The reorganization of a municipality’s debts may significantly affect the rights of creditors and the value of the securities issued by the municipality and the value of the Fund’s investments.
A C I Shares | JPMorgan High Yield Municipal Fund | General Market Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	General Market Risk. Economies and financial markets throughout the world are becoming increasingly interconnected, which increases the likelihood that events or conditions in one country or region will adversely impact markets or issuers in other countries or regions. Securities in the Fund’s portfolio may underperform in comparison to securities in general financial markets, a particular financial market or other asset classes due to a number of factors, including inflation (or expectations for inflation), deflation (or expectations for deflation), interest rates, global demand for particular products or resources, market instability, financial system instability, debt crises and downgrades, embargoes, tariffs, sanctions and other trade barriers, regulatory events, other governmental trade or market control programs and related geopolitical events. In addition, the value of the Fund’s investments may be negatively affected by the occurrence of global events such as war, terrorism, environmental disasters, natural disasters or events, country instability, and infectious disease epidemics or pandemics.For example, the outbreak of COVID-19 negatively affected economies, markets and individual companies throughout the world, including those in which the Fund invests. The effects of this, or any future, pandemic to public health and business and market conditions may have a significant negative impact on the performance of the Fund’s investments, increase the Fund’s volatility, exacerbate preexisting political, social and economic risks to the Fund, and negatively impact broad segments of businesses and populations. In addition, governments, their regulatory agencies, or self-regulatory organizations have taken or may take actions in response to a pandemic that affect the instruments in which the Fund invests, or the issuers of such instruments, in ways that could have a significant negative impact on the Fund’s investment performance. The ultimate impact of any pandemic and the extent to which the associated conditions and governmental responses impact the Fund will also depend on future developments, which are highly uncertain, difficult to accurately predict and subject to frequent changes.
A C I Shares | JPMorgan High Yield Municipal Fund | Alternative Minimum Tax Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Alternative Minimum Tax Risk. The Fund may invest in securities, the interest on which may be subject to the federal alternative minimum tax.
A C I Shares | JPMorgan High Yield Municipal Fund | High Yield Securities Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	High Yield Securities Risk. The Fund may invest in securities and instruments of municipal issuers that are highly leveraged, less creditworthy or financially distressed. These investments (also known as junk bonds) are considered to be speculative and are subject to greater risk of loss, greater sensitivity to economic changes, valuation difficulties, and potential illiquidity.In recent years, there has been a broad trend of weaker or less restrictive covenant protections in the high yield market. Among other things, under such weaker or less restrictive covenants, borrowers might be able to exercise more flexibility with respect to certain activities than borrowers who are subject to stronger or more protective covenants. For example, borrowers might be able to incur more debt, including secured debt, return more capital to shareholders, remove or reduce assets that are designated as collateral securing high yield securities, increase the claims against assets that are permitted against collateral securing high yield securities or otherwise manage their business in ways that could impact creditors negatively. In addition, certain privately held borrowers might be permitted to file less frequent, less detailed or less timely financial reporting or other information, which could negatively impact the value of the high yield securities issued by such borrowers.Each of these factors might negatively impact the high yield instruments held by the Fund. No active trading market may exist for some instruments and certain investments may be subject to restrictions on resale. The inability to dispose of the Fund’s securities and other investments in a timely fashion could result in losses to the Fund. Because some instruments may have a more limited secondary market, liquidity and valuation risk may be more pronounced for the Fund. When instruments are prepaid, the Fund may have to reinvest in instruments with a lower yield or fail to recover additional amounts (i.e., premiums) paid for these instruments, resulting in an unexpected capital loss and/or a decrease in the amount of dividends and yield.
A C I Shares | JPMorgan High Yield Municipal Fund | Interest Rate Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Interest Rate Risk. The Fund mainly invests in bonds and other debt securities. These securities will increase or decrease in value based on changes in interest rates. If rates increase, the value of the Fund’s investments generally declines. Securities with greater interest rate sensitivity and longer maturities generally are subject to greater fluctuations in value. The Fund may face a heightened level of interest rate risk due to certain changes in monetary policy. It is difficult to predict the pace at which central banks or monetary authorities may increase interest rates or the timing, frequency, or magnitude of such increases. Any such changes could be sudden and could exposedebt markets to significant volatility and reduced liquidity for Fund investments.
A C I Shares | JPMorgan High Yield Municipal Fund | Credit Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Credit Risk. The Fund’s investments are subject to the risk that issuers and/or counterparties will fail to make payments when due or default completely. If an issuer’s or a counterparty’s financial condition worsens, the credit quality of the issuer or counterparty may deteriorate. Credit spreads may increase, which may reduce the market values of the Fund’s securities. Credit spread risk is the risk that economic and market conditions or any actual or perceived credit deterioration may lead to an increase in the credit spreads (i.e., the difference in yield between two securities of similar maturity but different credit quality) and a decline in price of the issuer’s securities.
A C I Shares | JPMorgan High Yield Municipal Fund | Floating and Variable Rate Securities Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Floating and Variable Rate Securities Risk. Floating and variable rate securities provide for a periodic adjustment in the interest rate paid on the securities. The rate adjustment intervals may be regular and range from daily up to annually, or may be based on an event, such as a change in the prime rate. Floating and variable rate securities may be subject to greater liquidity risk than other debt securities, meaning that there may be limitations on the Fund’s ability to sell the securities at any given time. Such securities also may lose value.
A C I Shares | JPMorgan High Yield Municipal Fund | Structured Product Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Structured Product Risk. Structured products, such as tender option bonds, involve structural complexities and potential risks that may not be present where a municipal security is owned directly. These enhanced risks may include additional counter-party risk (the risk that the counterparty will not fulfill its contractual obligations) and call risk (the risk that the instruments will be called and the proceeds may need to be reinvested). Additionally, an active trading market for such instruments may not exist. To the extent that a structured product provides a put, the Fund may receive a lower interest rate in return for such feature and will be subject to the risk that the put provider will be unable to honor the put feature (purchase the security). Finally, short-term municipal or tax-exempt structured products may present tax issues not presented by investments in other short-term municipal or tax-exempt securities. These issues might be resolved in a manner adverse to the Fund.
A C I Shares | JPMorgan High Yield Municipal Fund | Restricted Securities Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Restricted Securities Risk. Restricted securities are securities that cannot be offered for public resale unless registered under the applicable securities laws or that have a contractual restriction that prohibits or limits their resale. Restricted securities include private placement securities that have not been registered under the applicable securities laws, such as Rule 144A securities, and securities of U.S. and non-U.S. issuers that are issued pursuant to Regulation S. Private placements are generally subject to strict restrictions on resale. Restricted securities may not be listed on an exchange and may have no active trading market. Restricted securities may be illiquid. The Fund may be unable to sell a restricted security on short notice or may be able to sell them only at a price below current value. It may be more difficult to determine a market value for a restricted security. Also, the Fund may get only limited information about the issuer of a restricted security, so it may be less able to predict a loss. In addition, if Fund management receives material non-public information about the issuer, the Fund may as a result be unable to sell the securities. Certain restricted securities may involve a high degree of business and financial risk and may result in substantial losses.
A C I Shares | JPMorgan High Yield Municipal Fund | Auction Rate Securities Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Auction Rate Securities Risk. The auction rate municipal securities the Fund will purchase will typically have a long-term nominal maturity for which the interest rate is regularly reset through a “Dutch” auction. The interest rate set by the auction is the lowest interest rate that covers all securities offered for sale. While this process is designed to permit auction rate securities to be traded at par value, there is a risk that an auction will fail due to insufficient demand for the securities, which may adversely affect the liquidity and price of auction rate securities. Moreover, between auctions, there may be no secondary market for these securities, and sales conducted on a secondary market may not be on terms favorable to the seller. Thus, with respect to liquidity and price stability, auction rate securities may differ substantially from cash equivalents, notwithstanding the frequency of auctions and the credit quality of the security.
A C I Shares | JPMorgan High Yield Municipal Fund | ETF and Other Investment Company Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	ETF and Other Investment Company Risk. The Fund may invest in shares of other investment companies and ETFs. Shareholders bear both their proportionate share of Fund’s expenses and similar expenses of the underlying investment company or ETF when the Fund invests in shares of another investment company or ETF. The price movement of an ETF or closed end fund designed to track an index may not track the index and may result in a loss. In addition, ETFs and closed-end investment companies may trade at a price above (premium) or below (discount) their NAV, especially during periods of significant market volatility or stress, causing investors to pay significantly more or less than the value of the ETF’s underlying portfolio. If the Fund invests in closed-end investment companies, it may incur added expenses such as additional management fees and trading costs.
A C I Shares | JPMorgan High Yield Municipal Fund | Government Securities Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Government Securities Risk. The Fund invests in securities issued or guaranteed by the U.S. government or its agencies or other Government-Sponsored Enterprises (GSEs). U.S. government securities are subject to market risk, interest rate risk and credit risk. Securities, such as those issued or guaranteed by the U.S. Treasury, that are backed by the full faith and credit of the United States are guaranteed only as to the timely payment of interest and principal when held to maturity and the market prices for such securities will fluctuate. Notwithstanding that these securities are backed by the full faith and credit of the United States, circumstances could arise that would prevent the payment of interest or principal. This would result in losses to the Fund. U.S. government securities include zero coupon securities, which tend to be subject to greater market risk than interest-paying securities of similar maturities.
A C I Shares | JPMorgan High Yield Municipal Fund | Debt Securities and Other Callable Securities Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Debt Securities and Other Callable Securities Risk. As part of its main investment strategy, the Fund invests in debt securities. The issuers of these securities and other callable securities may be able to repay principal in advance, especially when interest rates fall. Changes in prepayment rates can affect the return on investment and yield of these securities. When debt obligations are prepaid and when securities are called, the Fund may have to reinvest in securities with a lower yield. The Fund also may fail to recover additional amounts (i.e., premiums) paid for securities with higher interest rates, resulting in an unexpected capital loss.
A C I Shares | JPMorgan High Yield Municipal Fund | Inverse Floating Rate Instrument Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Inverse Floating Rate Instrument Risk. The market value of an inverse floater can be more volatile than that of a conventional fixed-rate bond having similar credit quality, maturity and redemption provisions. Inverse floaters involve complex transactions and involve risks in addition to risks associated with more conventional municipal obligations. Inverse floaters may be more sensitive to changes in economic or market conditions than other types of investments and could result in losses that significantly exceed the Fund’s original investment. Inverse floaters can create leverage thereby causing the Fund to be more volatile than it would be if it had not used inverse floaters.
A C I Shares | JPMorgan High Yield Municipal Fund | Tax Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Taxability Risk. The Fund’s investments in municipal securities rely on the opinion of the issuer’s bond counsel that the interest paid on those securities will not be subject to federal income tax. Tax opinions are generally provided at the time the municipal security is initially issued. However, after the Fund buys a security, the Internal Revenue Service may determine that a bond issued as tax-exempt should in fact be taxable and the Fund’s dividends with respect to that bond might be subject to federal income tax.
A C I Shares | JPMorgan High Yield Municipal Fund | Zero Coupon Bond Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Zero-Coupon Bond Risk. The market value of a zero-coupon bond is generally more volatile than the market value of other fixed income securities with similar maturities that pay interest periodically. In addition, federal income tax law requires that the holder of a zero-coupon bond accrue a portion of the discount at which the bond was purchased as taxable income each year. The Fund may consequently have to dispose of portfolio securities under disadvantageous circumstances to generate cash to satisfy its requirement as a regulated investment company to distribute all of its net income (including non-cash income attributable to zero-coupon securities). These actions may reduce the assets to which the Fund’s expenses could otherwise be allocated and may reduce the Fund’s rate of return.
A C I Shares | JPMorgan High Yield Municipal Fund | Transactions Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Transactions Risk. The Fund could experience a loss and its liquidity may be negatively impacted when selling securities to meet redemption requests. The risk of loss increases if the redemption requests are unusually large or frequent or occur in times of overall market turmoil or declining prices. Similarly, large purchases of Fund Shares may adversely affect the Fund’s performance to the extent that the Fund is delayed in investing new cash and is required to maintain a larger cash position than it ordinarily would.
A C I Shares | JPMorgan High Yield Municipal Fund | Industry and Sector Focus Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Industry and Sector Focus Risk. At times the Fund may increase the relative emphasis of its investments in a particular industry or sector. The prices of securities of issuers in a particular industry or sector may be more susceptible to fluctuations due to changes in economic or business conditions, government regulations, availability of basic resources or supplies, contagion risk within a particular industry or sector or to other industries or sectors, or other events that affect that industry or sector more than securities of issuers in other industries and sectors. To the extent that the Fund increases the relative emphasis of its investments in a particular industry or sector, the value of the Fund’s shares may fluctuate in response to events affecting that industry or sector.
A C I Shares | JPMorgan High Yield Municipal Fund | Class A
Risk Return Abstract	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases as a % of the Offering Price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	3.75%
Maximum Deferred Sales Charge (Load) as a % of Original Cost of the Shares	rr_MaximumDeferredSalesChargeOverOther	none	[1]
Management Fees	rr_ManagementFeesOverAssets	0.35%
Distribution (Rule 12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Service Fees	rr_Component1OtherExpensesOverAssets	0.25%
Remainder of Other Expenses	rr_Component2OtherExpensesOverAssets	0.17%
Other Expenses	rr_OtherExpensesOverAssets	0.42%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.02%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.37%)	[2]
Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	0.65%	[2]
1 Year	rr_ExpenseExampleYear01	$ 439
3 Years	rr_ExpenseExampleYear03	652
5 Years	rr_ExpenseExampleYear05	882
10 Years	rr_ExpenseExampleYear10	1,544
1 Year	rr_ExpenseExampleNoRedemptionYear01	439
3 Years	rr_ExpenseExampleNoRedemptionYear03	652
5 Years	rr_ExpenseExampleNoRedemptionYear05	882
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,544
Past 1 Year	rr_AverageAnnualReturnYear01	(18.67%)
Past 5 Years	rr_AverageAnnualReturnYear05	(0.25%)
Past 10 Years	rr_AverageAnnualReturnYear10	1.10%
A C I Shares | JPMorgan High Yield Municipal Fund | Class C
Risk Return Abstract	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases as a % of the Offering Price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) as a % of Original Cost of the Shares	rr_MaximumDeferredSalesChargeOverOther	1.00%
Management Fees	rr_ManagementFeesOverAssets	0.35%
Distribution (Rule 12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.75%
Service Fees	rr_Component1OtherExpensesOverAssets	0.25%
Remainder of Other Expenses	rr_Component2OtherExpensesOverAssets	0.17%
Other Expenses	rr_OtherExpensesOverAssets	0.42%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.52%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.37%)	[2]
Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	1.15%	[2]
1 Year	rr_ExpenseExampleYear01	$ 217
3 Years	rr_ExpenseExampleYear03	444
5 Years	rr_ExpenseExampleYear05	794
10 Years	rr_ExpenseExampleYear10	1,646
1 Year	rr_ExpenseExampleNoRedemptionYear01	117
3 Years	rr_ExpenseExampleNoRedemptionYear03	444
5 Years	rr_ExpenseExampleNoRedemptionYear05	794
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,646
Past 1 Year	rr_AverageAnnualReturnYear01	(16.90%)
Past 5 Years	rr_AverageAnnualReturnYear05	0.02%
Past 10 Years	rr_AverageAnnualReturnYear10	1.07%
A C I Shares | JPMorgan High Yield Municipal Fund | Class I
Risk Return Abstract	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases as a % of the Offering Price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) as a % of Original Cost of the Shares	rr_MaximumDeferredSalesChargeOverOther	none
Management Fees	rr_ManagementFeesOverAssets	0.35%
Distribution (Rule 12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Service Fees	rr_Component1OtherExpensesOverAssets	0.25%
Remainder of Other Expenses	rr_Component2OtherExpensesOverAssets	0.17%
Other Expenses	rr_OtherExpensesOverAssets	0.42%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.77%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.22%)	[2]
Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	0.55%	[2]
1 Year	rr_ExpenseExampleYear01	$ 56
3 Years	rr_ExpenseExampleYear03	224
5 Years	rr_ExpenseExampleYear05	406
10 Years	rr_ExpenseExampleYear10	934
1 Year	rr_ExpenseExampleNoRedemptionYear01	56
3 Years	rr_ExpenseExampleNoRedemptionYear03	224
5 Years	rr_ExpenseExampleNoRedemptionYear05	406
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 934
2013	rr_AnnualReturn2013	(1.78%)
2014	rr_AnnualReturn2014	6.78%
2015	rr_AnnualReturn2015	2.34%
2016	rr_AnnualReturn2016	1.06%
2017	rr_AnnualReturn2017	4.60%
2018	rr_AnnualReturn2018	1.64%
2019	rr_AnnualReturn2019	10.16%
2020	rr_AnnualReturn2020	3.01%
2021	rr_AnnualReturn2021	5.75%
2022	rr_AnnualReturn2022	(15.42%)
Year to Date Return, Label	rr_YearToDateReturnLabel	<span style="font-family:Arial;font-size:9pt;margin-left:0.0pt;">The Fund’s year-to-date total return</span>
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Mar. 31, 2023
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	1.94%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	<span style="font-family:Arial;font-size:9pt;font-weight:bold;margin-left:0.0pt;">Best Quarter</span>
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Mar. 31, 2019
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	3.81%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	<span style="font-family:Arial;font-size:9pt;font-weight:bold;margin-left:0.0pt;">Worst Quarter</span>
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Mar. 31, 2022
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(7.16%)
Past 1 Year	rr_AverageAnnualReturnYear01	(15.42%)
Past 5 Years	rr_AverageAnnualReturnYear05	0.62%
Past 10 Years	rr_AverageAnnualReturnYear10	1.59%
A C I Shares | JPMorgan High Yield Municipal Fund | Return After Taxes on Distributions | Class I
Risk Return Abstract	rr_RiskReturnAbstract
Past 1 Year	rr_AverageAnnualReturnYear01	(15.44%)
Past 5 Years	rr_AverageAnnualReturnYear05	0.56%
Past 10 Years	rr_AverageAnnualReturnYear10	1.40%
A C I Shares | JPMorgan High Yield Municipal Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class I
Risk Return Abstract	rr_RiskReturnAbstract
Past 1 Year	rr_AverageAnnualReturnYear01	(7.84%)
Past 5 Years	rr_AverageAnnualReturnYear05	1.22%
Past 10 Years	rr_AverageAnnualReturnYear10	1.75%
A C I Shares | JPMorgan High Yield Municipal Fund | BLOOMBERG US MUNICIPAL INDEX(Reflects No Deduction for Fees, Expenses, or Taxes)
Risk Return Abstract	rr_RiskReturnAbstract
Past 1 Year	rr_AverageAnnualReturnYear01	(8.53%)
Past 5 Years	rr_AverageAnnualReturnYear05	1.25%
Past 10 Years	rr_AverageAnnualReturnYear10	2.13%
A C I Shares | JPMorgan High Yield Municipal Fund | BLOOMBERG HIGH YIELD MUNICIPAL BOND INDEX(Reflects No Deduction for Fees, Expenses, or Taxes)
Risk Return Abstract	rr_RiskReturnAbstract
Past 1 Year	rr_AverageAnnualReturnYear01	(13.10%)
Past 5 Years	rr_AverageAnnualReturnYear05	2.63%
Past 10 Years	rr_AverageAnnualReturnYear10	3.49%

[1] For purchases under $250,000.

[2] The Fund’s adviser and/or its affiliates have contractually agreed to waive fees and/or reimburse expenses to the extent Total Annual Fund Operating Expenses (excluding acquired fund fees and expenses other than certain money market fund fees as described below, dividend and interest expenses related to short sales, interest, taxes, expenses related to litigation and potential litigation, expenses related to trustee elections, and extraordinary expenses) exceed 0.65%, 1.15% and 0.55% of the average daily net assets of Class A, Class C and Class I Shares, respectively. The Fund may invest in one or more money market funds advised by the adviser or its affiliates (affiliated money market funds). The Fund’s adviser, shareholder servicing agent and/or administrator have contractually agreed to waive fees and/or reimburse expenses in an amount sufficient to offset the respective net fees each collects from the affiliated money market funds on the Fund’s investment in such money market funds for all Share Classes. These waivers are in effect through 6/30/24, at which time it will be determined whether such waivers will be renewed or revised. To the extent that the Fund engages in securities lending, affiliated money market fund fees and expenses resulting from the Fund’s investment of cash received from securities lending borrowers are not included in Total Annual Fund Operating Expenses and therefore, the above waivers do not apply to such investments.