v3.26.3
Shareholder Report
 6 Months Ended
Aug. 31, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name JPMorgan Institutional Trust
Entity Central Index Key 0001303608
Entity Investment Company Type N-1A
Document Period End Date Aug. 31, 2026
C000020141 [Member]  
Shareholder Report [Line Items]  
Fund Name JPMorgan Core Bond Trust
Class Name JPMorgan Core Bond Trust
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the JPMorgan Core Bond Trust (the "Fund") for the period March 1, 2026 to August 31, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://connect.rightprospectus.com/JPMorgan/TVT/62826M921/SAR?site=JPMCBT. 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 https://connect.rightprospectus.com/JPMorgan/TVT/62826M921/SAR?site=JPMCBT
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Fund Costs of a
$10,000 investment		 Costs paid as a percentage
of a $10,000 investment*
JPMorgan Core Bond Trust
 $7 0.15%
*
This charge is annualized.
Expenses Paid, Amount $ 7
Expense Ratio, Percent 0.15% [1]
Net Assets $ 4,668,968,000
Holdings Count | Holding 2,534
Investment Company Portfolio Turnover 19.00%
Additional Fund Statistics [Text Block]

KEY FUND STATISTICS
Fund net assets (000's) $4,668,968
Total number of portfolio holdings 2,534
Portfolio turnover rate 19 %
Holdings [Text Block]
PORTFOLIO COMPOSITION - ASSET CLASS
(% of Total Investments)
Graphical Representation - Allocation 1 Chart
[1] This charge is annualized.