v3.25.2
JPMorgan National Municipal Income Fund Average Annual Total Returns - R6 Shares [Member]
 12 Months Ended 60 Months Ended 120 Months Ended
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
BLOOMBERG US MUNICIPAL INDEX(Reflects No Deduction for Fees, Expenses, or Taxes)[Member]      
Prospectus [Line Items]      
Average Annual Return, Percent [1],[2] 1.05% 0.99% 2.25%
BLOOMBERG U.S. 1-15 YEAR BLEND (1-17) MUNICIPAL BOND INDEX(Reflects No Deduction for Fees, Expenses, or Taxes)[Member]      
Prospectus [Line Items]      
Average Annual Return, Percent 0.88% 1.08% 2.04%
Class R6      
Prospectus [Line Items]      
Average Annual Return, Percent 2.30% 1.03% 1.81%
Class R6 | After Taxes on Distributions      
Prospectus [Line Items]      
Average Annual Return, Percent 2.28% 0.98% 1.76%
Class R6 | After Taxes on Distributions and Sales      
Prospectus [Line Items]      
Average Annual Return, Percent 2.89% 1.46% 2.01%
[1] As a result of new regulatory requirements, the Fund's regulatory index has changed from the Bloomberg California Municipal Bond Index to the Bloomberg US Municipal Index.
[2] As a result of new regulatory requirements, the Fund's regulatory index has changed from the Bloomberg New York Municipal Bond Index to the Bloomberg US Municipal Index.