v3.25.2
Fees and Expenses - AMERICAN FUNDS SHORT-TERM TAX-EXEMPT BOND FUND
Sep. 30, 2025
USD ($)
AMERICAN FUNDS SHORT-TERM TAX-EXEMPT BOND FUND (Class A, Class F-1, Class F-2, Class F-3, Class T)  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and expenses of the fund
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. For example, in addition to the fees and expenses described below, you may also be required to pay brokerage commissions on purchases and sales of Class F-2 or F-3 shares of the fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in American Funds, Capital Group KKR Public-Private+ Funds, and/or Emerging Markets Equities Fund, Inc. (collectively “Capital Group Funds”). More information about these and other discounts is available from your financial professional, in the “Sales charge reductions and waivers” sections on page 49 of the prospectus and on page 91 of the fund’s statement of additional information, and in the sales charge waiver appendix to the prospectus.

Expense Breakpoint Discounts [Text] You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in American Funds, Capital Group KKR Public-Private+ Funds, and/or Emerging Markets Equities Fund, Inc. (collectively “Capital Group Funds”).
Expense Breakpoint, Minimum Investment Required [Amount] $ 100,000
Shareholder Fees Caption [Optional Text] Shareholder fees (fees paid directly from your investment)
Shareholder Fees [Table]
       
Shareholder fees (fees paid directly from your investment)
Share class: A T All F share
classes
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) 2.50% 2.50% none
Maximum deferred sales charge (load) (as a percentage of the amount redeemed) 0.751 none none
Maximum sales charge (load) imposed on reinvested dividends none none none
Redemption or exchange fees none none none
Operating Expenses Caption [Optional Text] Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
           
Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)
Share class: A T F-1 F-2 F-3
Management fees 0.20% 0.20% 0.20% 0.20% 0.20%
Distribution and/or service (12b-1) fees 0.15 0.25 0.25 none none
Other expenses 0.09 0.09 0.18 0.12 0.05
Total annual fund operating expenses 0.44 0.54 0.63 0.32 0.25
Expense reimbursement2 0.01 0.01 0.01 0.01 0.01
Total annual fund operating expenses after expense reimbursement 0.43 0.53 0.62 0.31 0.24

1 A contingent deferred sales charge of 0.75% applies on certain redemptions made within 18 months following purchases of $250,000 or more made without an initial sales charge. Contingent deferred sales charge is calculated based on the lesser of the offering price and market value of shares being sold.

2 The investment adviser is currently reimbursing a portion of the other expenses. This reimbursement will be in effect through at least October 1, 2026. The adviser may elect at its discretion to extend, modify or terminate the reimbursement at that time.

Expenses Deferred Charges [Text Block] A contingent deferred sales charge of 0.75% applies on certain redemptions made within 18 months following purchases of $250,000 or more made without an initial sales charge. Contingent deferred sales charge is calculated based on the lesser of the offering price and market value of shares being sold.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds.

The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the fund’s operating expenses remain the same. The example reflects the expense reimbursement described above through the expiration date of such reimbursement and total annual fund operating expenses thereafter. You may be required to pay brokerage commissions on your purchases and sales of Class F-2 or F-3 shares of the fund, which are not reflected in the example.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
           
Share class: A T F-1 F-2 F-3
1 year $293 $303 $63 $32 $25
3 years 387 418 201 102 79
5 years 489 543 350 179 140
10 years 790 909 785 405 317
Portfolio Turnover [Heading] Portfolio turnover
Portfolio Turnover [Text Block]

The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s investment results. During the most recent fiscal year, the fund’s portfolio turnover rate was 56% of the average value of its portfolio.

Portfolio Turnover, Rate 56.00%
AMERICAN FUNDS SHORT-TERM TAX-EXEMPT BOND FUND (Class R-6)  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and expenses of the fund
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may pay other fees to financial intermediaries, which are not reflected in the tables and examples below.

Shareholder Fees Caption [Optional Text] Shareholder fees (fees paid directly from your investment)
Shareholder Fees [Table]
   
Shareholder fees (fees paid directly from your investment)
Share class: R-6
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) none
Maximum deferred sales charge (load) (as a percentage of the amount redeemed) none
Maximum sales charge (load) imposed on reinvested dividends none
Redemption or exchange fees none
Operating Expenses Caption [Optional Text] Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
   
Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)
Share class: R-6
Management fees 0.20%
Distribution and/or service (12b-1) fees none
Other expenses 0.05
Total annual fund operating expenses 0.25
Expense reimbursement* 0.01
Total annual fund operating expenses after expense reimbursement 0.24

* The investment adviser is currently reimbursing a portion of the other expenses. This reimbursement will be in effect through at least October 1, 2026. The adviser may elect at its discretion to extend, modify or terminate the reimbursement at that time.

Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds.

The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the fund’s operating expenses remain the same. The example reflects the expense reimbursement described above through the expiration date of such reimbursement and total annual fund operating expenses thereafter.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
         
Share class 1 year 3 years 5 years 10 years
R-6 $25 $79 $140 $317
Portfolio Turnover [Heading] Portfolio turnover
Portfolio Turnover [Text Block]

The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s investment results. During the most recent fiscal year, the fund’s portfolio turnover rate was 56% of the average value of its portfolio.

Portfolio Turnover, Rate 56.00%