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Class K [Member] Average Annual Total Returns - Class K
12 Months Ended 60 Months Ended 120 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Bloomberg Municipal Bond Index (Reflects no deduction for fees, expenses or taxes)      
Prospectus [Line Items]      
Average Annual Return, Percent 4.25% 0.80% 2.34%
Bloomberg Municipal 1-5 Year Index (Reflects no deduction for fees, expenses or taxes)      
Prospectus [Line Items]      
Average Annual Return, Percent 4.11% 1.36% 1.67%
Class K Shares      
Prospectus [Line Items]      
Average Annual Return, Percent 5.20% 1.99% 1.63%
Class K Shares | After Taxes on Distributions      
Prospectus [Line Items]      
Average Annual Return, Percent 5.20% 1.99% 1.63%
Class K Shares | After Taxes on Distributions and Sales      
Prospectus [Line Items]      
Average Annual Return, Percent 4.56% 2.06% 1.65%