v3.26.1
Shareholder Report
 6 Months Ended
Apr. 30, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name JPMorgan Trust IV
Entity Central Index Key 0001659326
Entity Investment Company Type N-1A
Document Period End Date Apr. 30, 2026
C000205719 [Member]  
Shareholder Report [Line Items]  
Fund Name JPMorgan Emerging Markets Research Enhanced Equity Fund
Class Name Class I Shares
Trading Symbol EMREX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the JPMorgan Emerging Markets Research Enhanced Equity Fund (the "Fund") for the period November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.jpmorganfunds.com/funddocuments. You can also request this information by contacting us at 1-800-480-4111, by sending an e-mail request to Funds.Website.Support@jpmorganfunds.com or by asking any financial intermediary that offers shares of the Fund.
Additional Information Phone Number 1-800-480-4111
Additional Information Email Funds.Website.Support@jpmorganfunds.com
Additional Information Website www.jpmorganfunds.com/funddocuments
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Fund (Class) Costs of a
$10,000 investment		 Costs paid as a percentage
of a $10,000 investment*
JPMorgan Emerging Markets Research Enhanced Equity Fund
(Class I Shares)		 $25 0.47%
*
This charge is annualized.
Expenses Paid, Amount $ 25
Expense Ratio, Percent 0.47% [1]
Net Assets $ 2,078,680,000
Holdings Count | Holding 328
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block]

KEY FUND STATISTICS
Fund net assets (000's) $2,078,680
Total number of portfolio holdings 328
Portfolio turnover rate 23 %
Holdings [Text Block]
PORTFOLIO COMPOSITION - COUNTRY
(% of Total Investments)
Graphical Representation - Allocation 1 Chart
C000205718 [Member]  
Shareholder Report [Line Items]  
Fund Name JPMorgan Emerging Markets Research Enhanced Equity Fund
Class Name Class R6 Shares
Trading Symbol EMRSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the JPMorgan Emerging Markets Research Enhanced Equity Fund (the "Fund") for the period November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.jpmorganfunds.com/funddocuments. You can also request this information by contacting us at 1-800-480-4111, by sending an e-mail request to Funds.Website.Support@jpmorganfunds.com or by asking any financial intermediary that offers shares of the Fund.
Additional Information Phone Number 1-800-480-4111
Additional Information Email Funds.Website.Support@jpmorganfunds.com
Additional Information Website www.jpmorganfunds.com/funddocuments
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Fund (Class) Costs of a
$10,000 investment		 Costs paid as a percentage
of a $10,000 investment*
JPMorgan Emerging Markets Research Enhanced Equity Fund
(Class R6 Shares)		 $20 0.37%
*
This charge is annualized.
Expenses Paid, Amount $ 20
Expense Ratio, Percent 0.37% [2]
Net Assets $ 2,078,680,000
Holdings Count | Holding 328
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block]

KEY FUND STATISTICS
Fund net assets (000's) $2,078,680
Total number of portfolio holdings 328
Portfolio turnover rate 23 %
Holdings [Text Block]
PORTFOLIO COMPOSITION - COUNTRY
(% of Total Investments)
Graphical Representation - Allocation 1 Chart
[1]
This charge is annualized.
[2]
This charge is annualized.