JPMorgan U.S. Small Company Fund Investment Strategy - A C I Shares [Member] - JPMorgan U.S. Small Company Fund	Jun. 30, 2026
Prospectus [Line Items]
Strategy [Heading]	<span style="color:#000000;font-family:Arial Narrow;font-size:11pt;font-weight:bold;">What are the Fund’s main investment strategies?</span>
Strategy Narrative [Text Block]	Under normal circumstances, the Fund invests at least 80% of its Assets in equity securities of small cap U.S. companies.Small cap companies are companies with market capitalizations similar to those within the universe of the Russell 2000® Index at the time of purchase. As of the reconstitution of the Russell 2000 Index on September 30, 2026, the market capitalizations of the companies in the index ranged from $5.62 million to $85.78 billion. “Assets” means net assets, plus the amount of borrowings for investment purposes. Sector by sector, the Fund’s weightings are similar to those of the Russell 2000® Index. The Fund can moderately underweight or overweight sectors when it believes it will benefit performance. The Fund pursues returns that exceed those of the Russell 2000® Index while seeking to limit its volatility relative to this index. In implementing its main strategies, the Fund’s investments are primarily in common stocks and real estate investment trusts (REITs).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. The Fund may use futures contracts to gain or reduce exposure to its index, maintain liquidity and minimize transaction costs. In managing cash flows, the Fund buys futures contracts to invest incoming cash in the market or sells futures contracts in response to cash outflows, thereby gaining market exposure to the index while maintaining a cash balance for liquidity. An issuer of a security will be deemed to be located in the United States if: (i) the principal trading market for the security is in the United States, (ii) the issuer is organized under the laws of the United States, or (iii) the issuer derives at least 50% of its revenues or profits from the United States or has at least 50% of its total assets situated in the United States.Investment Process: In managing the Fund, the adviser employs a process that ranks stocks based on its proprietary stock ranking system. The rankings are then reviewed and adjusted utilizing fundamental research conducted by the investment team to enhance accuracy and consistency. The adjusted rankings are used to place stocks into portfolios. 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 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 issuers and ascertain key issues that merit engagement with issuers. These assessments may not be conclusive, and securities of issuers 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 of issuers that may be positively impacted by such factors. In general, stocks are purchased when they are among the top ranked within their sector. Stocks become candidates for sale when their ranking falls, when they appear unattractive or when the company is no longer a small cap company. The Fund may continue to hold the securities if it believes further substantial growth is possible. Risk factor exposures are managed through portfolio construction. Portfolio constraints control for sector weights, position sizes and/or style characteristics of the Fund.

JPMorgan U.S. Small Company Fund Investment Strategy - A C I Shares [Member] - JPMorgan U.S. Small Company Fund

Jun. 30, 2026

<span style="color:#000000;font-family:Arial Narrow;font-size:11pt;font-weight:bold;">What are the Fund’s main investment strategies?</span>

Strategy Narrative [Text Block]

Under normal circumstances, the Fund invests at least 80% of its Assets in equity securities of small cap U.S. companies.Small cap companies are companies with market capitalizations similar to those within the universe of the Russell 2000® Index at the time of purchase. As of the reconstitution of the Russell 2000 Index on September 30, 2026, the market capitalizations of the companies in the index ranged from $5.62 million to $85.78 billion. “Assets” means net assets, plus the amount of borrowings for investment purposes. Sector by sector, the Fund’s weightings are similar to those of the Russell 2000® Index. The Fund can moderately underweight or overweight sectors when it believes it will benefit performance. The Fund pursues returns that exceed those of the Russell 2000® Index while seeking to limit its volatility relative to this index. In implementing its main strategies, the Fund’s investments are primarily in common stocks and real estate investment trusts (REITs).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. The Fund may use futures contracts to gain or reduce exposure to its index, maintain liquidity and minimize transaction costs. In managing cash flows, the Fund buys futures contracts to invest incoming cash in the market or sells futures contracts in response to cash outflows, thereby gaining market exposure to the index while maintaining a cash balance for liquidity. An issuer of a security will be deemed to be located in the United States if: (i) the principal trading market for the security is in the United States, (ii) the issuer is organized under the laws of the United States, or (iii) the issuer derives at least 50% of its revenues or profits from the United States or has at least 50% of its total assets situated in the United States.Investment Process: In managing the Fund, the adviser employs a process that ranks stocks based on its proprietary stock ranking system. The rankings are then reviewed and adjusted utilizing fundamental research conducted by the investment team to enhance accuracy and consistency. The adjusted rankings are used to place stocks into portfolios. 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 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 issuers and ascertain key issues that merit engagement with issuers. These assessments may not be conclusive, and securities of issuers 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 of issuers that may be positively impacted by such factors. In general, stocks are purchased when they are among the top ranked within their sector. Stocks become candidates for sale when their ranking falls, when they appear unattractive or when the company is no longer a small cap company. The Fund may continue to hold the securities if it believes further substantial growth is possible. Risk factor exposures are managed through portfolio construction. Portfolio constraints control for sector weights, position sizes and/or style characteristics of the Fund.