Label	Element	Value
Risk Return Abstract	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	JPMorgan Trust II
Prospectus Date	rr_ProspectusDate	Nov. 01, 2022
R2 R3 R4 R5 R6 Shares | JPMorgan Small Cap Growth 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: R2/JSGZX; R3/JGRQX; R4/JGLYX; R5/JGSVX; R6/JGSMX</span><span style="color:#000000;font-family:Arial;font-size:10pt;">Currently, the Fund is publicly offered on a limited basis. (See “Investing with J.P. Morgan Funds — FUNDS SUBJECT TO A LIMITED OFFERING” in the prospectus for more information.)</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 long-term capital growth primarily by investing in a portfolio of equity securities of small-capitalization and emerging growth companies.
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 table describes 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.
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	<span style="color:#FFFFFF;font-family:Arial Narrow;font-size:11pt;font-weight:bold;margin-left:4.51pt;">ANNUAL FUND OPERATING EXPENSES</span><span style="color:#FFFFFF;font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:4.51pt;">(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:4.51pt;">of your investment)</span>
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	<span style="color:#000000;font-family:Arial;font-size:8pt;">10/31/23</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 35% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	35.00%
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 10/31/23 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;">WHETHER OR NOT YOU 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, at least 80% of the Fund’s Assets will be invested in the securities of small capitalization companies. “Assets” means net assets, plus the amount of borrowings for investment purposes. Small cap companies are companies with market capitalizations equal to those within the universe of the Russell 2000® Growth Index stocks at the time of purchase. As of September 30, 2022, the market capitalizations of the companies in the Russell 2000® Growth Index ranged from $0.93 million to $9.82 billion. In implementing its main strategies, the Fund will invest primarily in common stocks. Typically, the Fund invests in securities of companies with a history of above-average growth, as well as companies expected to have above-average growth.Derivatives, which are instruments that have a value based on another instrument, exchange rate or index, may be used as substitutes for securities in which the Fund can invest. To the extent the Fund uses derivatives, the Fund will primarily use futures contracts to more effectively gain targeted equity exposure from its cash positions.Investment Process: In managing the Fund, the adviser employs a process that combines research, valuation and stock selection to identify companies that have a history of above-average growth or which the adviser believes will achieve above-average growth in the future. Growth companies purchased for the Fund include those with leading competitive positions that can achieve sustainable growth. As part of its investment process, the adviser seeks to assess the impact of environmental, social and governance (ESG) factors on many issuers in the universe in which the Fund invests. 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 securities and ascertain key issues that merit engagement with issuers. These assessments may not be conclusive and securities of issuers may be purchased and retained by the Fund for reasons other than material ESG factors while the Fund may divest or not invest in securities of issuers that may be positively impacted by such factors.The adviser may sell a security for several reasons. A security may be sold due to a change in the company’s fundamentals or if the adviser believes the security is no longer attractively valued. Investments may also be sold if the adviser identifies a stock that it believes offers a better investment opportunity.
Risk [Heading]	rr_RiskHeading	<span style="color:#000000;font-family:Arial;font-size:11pt;font-weight:bold;">The Fund’s Main Investment Risks</span>
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	The Fund is subject to management risk and may not achieve its objective if the adviser’s expectations regarding particular instruments or markets are not met.An investment in this Fund or any other fund may not provide a complete investment program. The suitability of an investment in the Fund should be considered based on the investment objective, strategies and risks described in this Prospectus, considered in light of all of the other investments in your portfolio, as well as your risk tolerance, financial goals and time horizons. You may want to consult with a financial advisor to determine if this Fund is suitable for you.The Fund is subject to the main risks noted below, any of which may adversely affect the Fund’s performance and ability to meet its investment objective.Equity Market Risk. The price of equity securities may rise or fall because of changes in the broad market or changes in a company’s financial condition, sometimes rapidly or unpredictably. These price movements may result from factors affecting individual companies, sectors or industries selected for the Fund’s portfolio or the securities market as a whole, such as changes in economic or political conditions. When the value of the Fund’s securities goes down, your investment in the Fund decreases in value.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, 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 has negatively affected economies, markets and individual companies throughout the world, including those in which the Fund invests. The effects of this pandemic to public health and business and market conditions, including, among other things, reduced consumer demand and economic output, supply chain disruptions and increased government spending, may continue to have a significant negative impact on the performance of the Fund’s investments, increase the Fund’s volatility, exacerbate pre-existing 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 the 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 duration and extent of COVID-19 and associated economic and market conditions and uncertainty over the long-term cannot be reasonably estimated at this time. The ultimate impact of COVID-19 and the extent to which the associated conditions impact the Fund will also depend on future developments, which are highly uncertain, difficult to accurately predict and subject to frequent changes.Smaller Company Risk. Investments in smaller companies may be riskier, less liquid, more volatile and more vulnerable to economic, market and industry changes than investments in larger, more established companies. The securities of smaller companies may trade less frequently and in smaller volumes than securities of larger companies. As a result, the share price changes may be more sudden or erratic than the prices of other securities, especially over the short term.Growth Investing Risk. Because growth investing attempts to identify companies that the adviser believes will experience rapid earnings growth relative to value or other types of stocks, growth stocks may trade at higher multiples of current earnings compared to value or other stocks, leading to inflated prices and thus potentially greater declines in value.Derivatives Risk. Derivatives, including futures, may be riskier than other types of investments and may increase the volatility of the Fund. Derivatives may be sensitive to changes in economic and market conditions and may create leverage, which could result in losses that significantly exceed the Fund’s original investment. The Fund may be more volatile than if the Fund had not been leveraged because the leverage tends to exaggerate any effect on the value of the Fund’s portfolio securities. Certain derivatives expose the Fund to counterparty risk, which is the risk that the derivative counterparty will not fulfill its contractual obligations (and includes credit risk associated with the counterparty). Certain derivatives are synthetic instruments that attempt to replicate the performance of certain reference assets. With regard to such derivatives, the Fund does not have a claim on the reference assets and is subject to enhanced counterparty risk. Derivatives may not perform as expected, so the Fund may not realize the intended benefits. When used for hedging, the change in value of a derivative may not correlate as expected with the security or other risk being hedged. In addition, given their complexity, derivatives expose the Fund to risks of mispricing or improper valuation.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, 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, its shares’ values may fluctuate in response to events affecting that industry or sector.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.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.You could lose money investing in the Fund.
Risk Lose Money [Text]	rr_RiskLoseMoney	<span style="color:#000000;font-family:Arial;font-size:10pt;margin-left:3pt;">You could lose money investing in the Fund.</span>
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	<span style="color:#000000;font-family:Arial;font-size:10pt;margin-left:0.0pt;">Investments in the Fund are not deposits or obligations of, or </span><span style="color:#000000;font-family:Arial;font-size:10pt;">guaranteed or endorsed by, any bank and are not insured or guaranteed by the FDIC, the Federal Reserve Board or any other government agency.</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 R2 Shares has varied from year to year for the past ten calendar years. The table shows the average annual total returns over the past one year, five years and ten years. The table compares the Fund’s performance to the performance of the Russell 2000® Growth Index. The performance for Class R3 Shares is based on the performance of Class A Shares (which are not offered in this prospectus) prior to the inception of Class R3 Shares. The actual returns of Class R3 Shares would have been lower than those shown because Class R3 Shares have higher expenses than Class A Shares. The performance for the Class R4 Shares is based on the performance of the Class I Shares (which are not offered in this prospectus) prior to the inception of the Class R4 Shares. The actual returns of Class R4 Shares would have been different than those shown because Class R4 Shares have different expenses than Class I Shares. The performance in the table for the Class R5 Shares is based on the performance of the Class L Shares (which are not offered in this prospectus) prior to the inception of the Class R5 Shares. The actual returns of the Class R5 Shares would have been different than those shown because Class R5 Shares have different expenses than Class L Shares. Past performance (before and after taxes) is not necessarily an indication of how any class of the Fund will perform in the future. Updated performance information is available by visiting www.jpmorganfunds.com or by calling 1-800-480-4111.
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 R2 Shares has varied from year to year for the past ten calendar years. </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 </span><span style="color:#000000;font-family:Arial;font-size:10pt;">after taxes) is not necessarily an indication of how any class of 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 R2 SHARES</span>
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Best Quarter2nd quarter, 202037.31%Worst Quarter4th quarter, 2018-21.83%The Fund’s year-to-date total returnthrough9/30/22was-31.21%.
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, 2021)</span>
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	<span style="color:#000000;font-family:Arial;font-size:10pt;">After-tax returns </span><span style="color:#000000;font-family:Arial;font-size:10pt;">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 your tax </span><span style="color:#000000;font-family:Arial;font-size:10pt;">situation and may differ from those shown. The after-tax returns shown 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 only for the Class R6 Shares, and after tax returns for the other classes will vary.</span>
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	After-tax returns are shown only for the Class R6 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 your tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
R2 R3 R4 R5 R6 Shares | JPMorgan Small Cap Growth Fund | Class R2
Risk Return Abstract	rr_RiskReturnAbstract
Management Fees	rr_ManagementFeesOverAssets	0.65%
Distribution (Rule 12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.50%
Service Fees	rr_Component1OtherExpensesOverAssets	0.25%
Remainder of Other Expenses	rr_Component2OtherExpensesOverAssets	0.12%
Other Expenses	rr_OtherExpensesOverAssets	0.37%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.52%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.03%)	[1]
Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	1.49%	[1]
1 Year	rr_ExpenseExampleYear01	$ 152
3 Years	rr_ExpenseExampleYear03	477
5 Years	rr_ExpenseExampleYear05	826
10 Years	rr_ExpenseExampleYear10	$ 1,810
2012	rr_AnnualReturn2012	12.06%
2013	rr_AnnualReturn2013	47.46%
2014	rr_AnnualReturn2014	(0.51%)
2015	rr_AnnualReturn2015	(2.34%)
2016	rr_AnnualReturn2016	7.47%
2017	rr_AnnualReturn2017	40.79%
2018	rr_AnnualReturn2018	(5.05%)
2019	rr_AnnualReturn2019	36.76%
2020	rr_AnnualReturn2020	58.80%
2021	rr_AnnualReturn2021	(6.26%)
Year to Date Return, Label	rr_YearToDateReturnLabel	<span style="color:#000000;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	Sep. 30, 2022
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	(31.21%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	<span style="color:#000000;font-family:Arial;font-size:9pt;font-weight:bold;margin-left:0.0pt;">Best Quarter</span>
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2020
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	37.31%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	<span style="color:#000000;font-family:Arial;font-size:9pt;font-weight:bold;margin-left:0.0pt;">Worst Quarter</span>
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2018
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(21.83%)
Past 1 Year	rr_AverageAnnualReturnYear01	(6.26%)
Past 5 Years	rr_AverageAnnualReturnYear05	22.17%
Past 10 Years	rr_AverageAnnualReturnYear10	16.73%
R2 R3 R4 R5 R6 Shares | JPMorgan Small Cap Growth Fund | Class R3
Risk Return Abstract	rr_RiskReturnAbstract
Management Fees	rr_ManagementFeesOverAssets	0.65%
Distribution (Rule 12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Service Fees	rr_Component1OtherExpensesOverAssets	0.25%
Remainder of Other Expenses	rr_Component2OtherExpensesOverAssets	0.13%
Other Expenses	rr_OtherExpensesOverAssets	0.38%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.28%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.04%)	[1]
Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	1.24%	[1]
1 Year	rr_ExpenseExampleYear01	$ 126
3 Years	rr_ExpenseExampleYear03	402
5 Years	rr_ExpenseExampleYear05	698
10 Years	rr_ExpenseExampleYear10	$ 1,542
Past 1 Year	rr_AverageAnnualReturnYear01	(6.04%)
Past 5 Years	rr_AverageAnnualReturnYear05	22.46%
Past 10 Years	rr_AverageAnnualReturnYear10	17.01%
R2 R3 R4 R5 R6 Shares | JPMorgan Small Cap Growth Fund | Class R4
Risk Return Abstract	rr_RiskReturnAbstract
Management Fees	rr_ManagementFeesOverAssets	0.65%
Distribution (Rule 12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Service Fees	rr_Component1OtherExpensesOverAssets	0.25%
Remainder of Other Expenses	rr_Component2OtherExpensesOverAssets	0.11%
Other Expenses	rr_OtherExpensesOverAssets	0.36%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.01%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.02%)	[1]
Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	0.99%	[1]
1 Year	rr_ExpenseExampleYear01	$ 101
3 Years	rr_ExpenseExampleYear03	320
5 Years	rr_ExpenseExampleYear05	556
10 Years	rr_ExpenseExampleYear10	$ 1,234
Past 1 Year	rr_AverageAnnualReturnYear01	(5.79%)
Past 5 Years	rr_AverageAnnualReturnYear05	22.78%
Past 10 Years	rr_AverageAnnualReturnYear10	17.31%
R2 R3 R4 R5 R6 Shares | JPMorgan Small Cap Growth Fund | Class R5
Risk Return Abstract	rr_RiskReturnAbstract
Management Fees	rr_ManagementFeesOverAssets	0.65%
Distribution (Rule 12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Service Fees	rr_Component1OtherExpensesOverAssets	0.10%
Remainder of Other Expenses	rr_Component2OtherExpensesOverAssets	0.11%
Other Expenses	rr_OtherExpensesOverAssets	0.21%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.86%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.02%)	[1]
Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	0.84%	[1]
1 Year	rr_ExpenseExampleYear01	$ 86
3 Years	rr_ExpenseExampleYear03	272
5 Years	rr_ExpenseExampleYear05	475
10 Years	rr_ExpenseExampleYear10	$ 1,059
Past 1 Year	rr_AverageAnnualReturnYear01	(5.63%)
Past 5 Years	rr_AverageAnnualReturnYear05	22.97%
Past 10 Years	rr_AverageAnnualReturnYear10	17.48%
R2 R3 R4 R5 R6 Shares | JPMorgan Small Cap Growth Fund | Class R6
Risk Return Abstract	rr_RiskReturnAbstract
Management Fees	rr_ManagementFeesOverAssets	0.65%
Distribution (Rule 12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Service Fees	rr_Component1OtherExpensesOverAssets	none
Remainder of Other Expenses	rr_Component2OtherExpensesOverAssets	0.11%
Other Expenses	rr_OtherExpensesOverAssets	0.11%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.76%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.02%)	[1]
Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	0.74%	[1]
1 Year	rr_ExpenseExampleYear01	$ 76
3 Years	rr_ExpenseExampleYear03	241
5 Years	rr_ExpenseExampleYear05	420
10 Years	rr_ExpenseExampleYear10	$ 940
Past 1 Year	rr_AverageAnnualReturnYear01	(5.56%)
Past 5 Years	rr_AverageAnnualReturnYear05	23.08%
Past 10 Years	rr_AverageAnnualReturnYear10	17.60%
R2 R3 R4 R5 R6 Shares | JPMorgan Small Cap Growth Fund | Return After Taxes on Distributions | Class R6
Risk Return Abstract	rr_RiskReturnAbstract
Past 1 Year	rr_AverageAnnualReturnYear01	(8.57%)
Past 5 Years	rr_AverageAnnualReturnYear05	20.47%
Past 10 Years	rr_AverageAnnualReturnYear10	15.43%
R2 R3 R4 R5 R6 Shares | JPMorgan Small Cap Growth Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class R6
Risk Return Abstract	rr_RiskReturnAbstract
Past 1 Year	rr_AverageAnnualReturnYear01	(1.93%)
Past 5 Years	rr_AverageAnnualReturnYear05	18.23%
Past 10 Years	rr_AverageAnnualReturnYear10	14.17%
R2 R3 R4 R5 R6 Shares | JPMorgan Small Cap Growth Fund | RUSSELL 2000 GROWTH INDEX(Reflects No Deduction for Fees, Expenses, or Taxes)
Risk Return Abstract	rr_RiskReturnAbstract
Past 1 Year	rr_AverageAnnualReturnYear01	2.83%
Past 5 Years	rr_AverageAnnualReturnYear05	14.53%
Past 10 Years	rr_AverageAnnualReturnYear10	14.14%

[1] 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 1.49%, 1.24%, 0.99%, 0.84% and 0.74% of the average daily net assets of Class R2, Class R3, Class R4, Class R5 and Class R6 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. These waivers are in effect through 10/31/23, 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.