Shareholder Report |
6 Months Ended | |||||||
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Jan. 31, 2026
USD ($)
Holding
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| Shareholder Report [Line Items] | ||||||||
| Document Type | N-CSRS | |||||||
| Amendment Flag | false | |||||||
| Registrant Name | American Funds Short-Term Tax-Exempt Bond Fund | |||||||
| Entity Central Index Key | 0000845376 | |||||||
| Entity Investment Company Type | N-1A | |||||||
| Document Period End Date | Jan. 31, 2026 | |||||||
| American Funds Short-Term Tax-Exempt Bond Fund® - Class A | ||||||||
| Shareholder Report [Line Items] | ||||||||
| Fund Name | American Funds Short-Term Tax-Exempt Bond Fund® | |||||||
| Class Name | Class A | |||||||
| Trading Symbol | ASTEX | |||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about American Funds Short-Term Tax-Exempt Bond Fund |
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| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |||||||
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-A . You can also request this information by contacting us at (800) 421-4225 .
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| Additional Information Phone Number | (800) 421-4225 | |||||||
| Additional Information Website | capitalgroup.com/mutual-fund-literature-A | |||||||
| Expenses [Text Block] | What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)
*Annualized.
|
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| Expenses Paid, Amount | $ 22 | |||||||
| Expense Ratio, Percent | 0.43% | [1] | ||||||
| Net Assets | $ 2,293,000,000 | |||||||
| Holdings Count | Holding | 1,233 | |||||||
| Investment Company, Portfolio Turnover | 27.00% | |||||||
| Additional Fund Statistics [Text Block] | Key fund statistics
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| Holdings [Text Block] | Portfolio quality summary * percent of ne t assets ) * Bond ratings, which typically range from AAA/Aaa (highest) to D (lowest), are assigned by credit rating agencies such as Standard & Poor’s, Moody’s and/or Fitch as an indication of an issuer’s creditworthiness. In assigning a credit rating to a security, the fund looks specifically to the ratings assigned to the issuer of the security by Standard & Poor’s, Moody’s and/or Fitch. If agency ratings differ, the security will be considered to have received the highest of those ratings, consistent with the fund’s investment policies. Securities in the “unrated“ category (above) have not been rated by a rating agency; however, the investment adviser performs its own credit analysis and assigns comparable ratings that are used for compliance with the fund’s investment policies.† Includes derivatives. |
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| American Funds Short-Term Tax-Exempt Bond Fund® - Class T | ||||||||
| Shareholder Report [Line Items] | ||||||||
| Fund Name | American Funds Short-Term Tax-Exempt Bond Fund® | |||||||
| Class Name | Class T | |||||||
| Trading Symbol | TAFSX | |||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about American Funds Short-Term Tax-Exempt Bond Fund (the "fund") for the period from August 1, 2025 to January 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 capitalgroup.com/mutual-fund-literature . You can also request this information by contacting us at (800) 421- 4225 |
|||||||
| Additional Information Phone Number | (800) 421-4225 | |||||||
| Additional Information Website | capitalgroup.com/mutual-fund-literature | |||||||
| Expenses [Text Block] | What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)
*Annualized.
|
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| Expenses Paid, Amount | $ 14 | |||||||
| Expense Ratio, Percent | 0.28% | [1] | ||||||
| Net Assets | $ 2,293,000,000 | |||||||
| Holdings Count | Holding | 1,233 | |||||||
| Investment Company, Portfolio Turnover | 27.00% | |||||||
| Additional Fund Statistics [Text Block] | Key fund statistics
|
|||||||
| Holdings [Text Block] | Portfolio quality summary * percent of net assets ) * Bond ratings, which typically range from AAA/Aaa (highest) to D (lowest), are assigned by credit rating agencies such as Standard & Poor’s, Moody’s and/or Fitch as an indication of an issuer’s creditworthiness. In assigning a credit rating to a security, the fund looks specifically to the ratings assigned to the issuer of the security by Standard & Poor’s, Moody’s and/or Fitch. If agency ratings differ, the security will be considered to have received the highest of those ratings, consistent with the fund’s investment policies. Securities in the “unrated“ category (above) have not been rated by a rating agency; however, the investment adviser performs its own credit analysis and assigns comparable ratings that are used for compliance with the fund’s investment policies.† Includes derivatives. |
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| American Funds Short-Term Tax-Exempt Bond Fund® Class F-1 | ||||||||
| Shareholder Report [Line Items] | ||||||||
| Fund Name | American Funds Short-Term Tax-Exempt Bond Fund® | |||||||
| Class Name | Class F-1 | |||||||
| Trading Symbol | FSTTX | |||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about American Funds Short-Term Tax-Exempt Bond Fund (the "fund") for the period from August 1, 2025 to January 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 capitalgroup.com/mutual-fund-literature-F1 . You can also request this information by contacting us at (800) 421-4225 .
|
|||||||
| Additional Information Phone Number | (800) 421-4225 | |||||||
| Additional Information Website | capitalgroup.com/mutual-fund-literature-F1 | |||||||
| Expenses [Text Block] | What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)
*Annualized.
|
|||||||
| Expenses Paid, Amount | $ 31 | |||||||
| Expense Ratio, Percent | 0.61% | [1] | ||||||
| Net Assets | $ 2,293,000,000 | |||||||
| Holdings Count | Holding | 1,233 | |||||||
| Investment Company, Portfolio Turnover | 27.00% | |||||||
| Additional Fund Statistics [Text Block] | Key fund statistics
|
|||||||
| Holdings [Text Block] | Portfolio quality summary * percent of net assets ) * Bond ratings, which typically range from AAA/Aaa (highest) to D (lowest), are assigned by credit rating agencies such as Standard & Poor’s, Moody’s and/or Fitch as an indication of an issuer’s creditworthiness. In assigning a credit rating to a security, the fund looks specifically to the ratings assigned to the issuer of the security by Standard & Poor’s, Moody’s and/or Fitch. If agency ratings differ, the security will be considered to have received the highest of those ratings, consistent with the fund’s investment policies. Securities in the “unrated“ category (above) have not been rated by a rating agency; however, the investment adviser performs its own credit analysis and assigns comparable ratings that are used for compliance with the fund’s investment policies.† Includes derivatives. |
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| American Funds Short-Term Tax-Exempt Bond Fund® Class F-2 | ||||||||
| Shareholder Report [Line Items] | ||||||||
| Fund Name | American Funds Short-Term Tax-Exempt Bond Fund® | |||||||
| Class Name | Class F-2 | |||||||
| Trading Symbol | ASTFX | |||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about American Funds Short-Term Tax-Exempt Bond Fund |
|||||||
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |||||||
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-F2 . You can also request this information by contacting us at (800) 421-4225 .
|
|||||||
| Additional Information Phone Number | (800) 421-4225 | |||||||
| Additional Information Website | capitalgroup.com/mutual-fund-literature-F2 | |||||||
| Expenses [Text Block] | What were the fund costs for the last six months? (based on a hypothetical $10,000 investment )
*Annualized.
|
|||||||
| Expenses Paid, Amount | $ 16 | |||||||
| Expense Ratio, Percent | 0.31% | [1] | ||||||
| Net Assets | $ 2,293,000,000 | |||||||
| Holdings Count | Holding | 1,233 | |||||||
| Investment Company, Portfolio Turnover | 27.00% | |||||||
| Additional Fund Statistics [Text Block] | Key fund statistics
|
|||||||
| Holdings [Text Block] | Portfolio quality summary * * Bond ratings, which typically range from AAA/Aaa (highest) to D (lowest), are assigned by credit rating agencies such as Standard & Poor’s, Moody’s and/or Fitch as an indication of an issuer’s creditworthiness. In assigning a credit rating to a security, the fund looks specifically to the ratings assigned to the issuer of the security by Standard & Poor’s, Moody’s and/or Fitch. If agency ratings differ, the security will be considered to have received the highest of those ratings, consistent with the fund’s investment policies. Securities in the “unrated“ category (above) have not been rated by a rating agency; however, the investment adviser performs its own credit analysis and assigns comparable ratings that are used for compliance with the fund’s investment policies.† Includes derivatives. |
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| American Funds Short-Term Tax-Exempt Bond Fund® Class F-3 | ||||||||
| Shareholder Report [Line Items] | ||||||||
| Fund Name | American Funds Short-Term Tax-Exempt Bond Fund® | |||||||
| Class Name | Class F-3 | |||||||
| Trading Symbol | SFTEX | |||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about American Funds Short-Term Tax-Exempt Bond Fund (the "fund") for the period from August 1, 2025 to January 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 capitalgroup.com/mutual-fund-literature-F3 . You can also request this information by contacting us at (800) 421-4225 .
|
|||||||
| Additional Information Phone Number | (800) 421-4225 | |||||||
| Additional Information Website | capitalgroup.com/mutual-fund-literature-F3 | |||||||
| Expenses [Text Block] | What were the fund costs for the last six months? (based on a hypothetical $10,000 investment )
*Annualized.
|
|||||||
| Expenses Paid, Amount | $ 13 | |||||||
| Expense Ratio, Percent | 0.25% | [1] | ||||||
| Net Assets | $ 2,293,000,000 | |||||||
| Holdings Count | Holding | 1,233 | |||||||
| Investment Company, Portfolio Turnover | 27.00% | |||||||
| Additional Fund Statistics [Text Block] | Key fund statistics
|
|||||||
| Holdings [Text Block] | Portfolio quality summary * assets ) * Bond ratings, which typically range from AAA/Aaa (highest) to D (lowest), are assigned by credit rating agencies such as Standard & Poor’s, Moody’s and/or Fitch as an indication of an issuer’s creditworthiness. In assigning a credit rating to a security, the fund looks specifically to the ratings assigned to the issuer of the security by Standard & Poor’s, Moody’s and/or Fitch. If agency ratings differ, the security will be considered to have received the highest of those ratings, consistent with the fund’s investment policies. Securities in the “unrated“ category (above) have not been rated by a rating agency; however, the investment adviser performs its own credit analysis and assigns comparable ratings that are used for compliance with the fund’s investment policies.† Includes derivatives. |
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| American Funds Short-Term Tax-Exempt Bond Fund® Class R-6 | ||||||||
| Shareholder Report [Line Items] | ||||||||
| Fund Name | American Funds Short-Term Tax-Exempt Bond Fund® | |||||||
| Class Name | Class R-6 | |||||||
| No Trading Symbol Flag | true | |||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about American Funds Short-Term Tax-Exempt Bond Fund (the "fund") for the period from August 1, 2025 to January 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 capitalgroup.com/mutual-fund-literature-R6 . You can also request this information by contacting us at (800) 421-4225 .
|
|||||||
| Additional Information Phone Number | (800) 421-4225 | |||||||
| Additional Information Website | capitalgroup.com/mutual-fund-literature-R6 | |||||||
| Expenses [Text Block] | What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)
*Annualized.
|
|||||||
| Expenses Paid, Amount | $ 12 | |||||||
| Expense Ratio, Percent | 0.23% | [1] | ||||||
| Net Assets | $ 2,293,000,000 | |||||||
| Holdings Count | Holding | 1,233 | |||||||
| Investment Company, Portfolio Turnover | 27.00% | |||||||
| Additional Fund Statistics [Text Block] | Key fund statistics
|
|||||||
| Holdings [Text Block] | Portfolio quality summary * assets ) * Bond ratings, which typically range from AAA/Aaa (highest) to D (lowest), are assigned by credit rating agencies such as Standard & Poor’s, Moody’s and/or Fitch as an indication of an issuer’s creditworthiness. In assigning a credit rating to a security, the fund looks specifically to the ratings assigned to the issuer of the security by Standard & Poor’s, Moody’s and/or Fitch. If agency ratings differ, the security will be considered to have received the highest of those ratings, consistent with the fund’s investment policies. Securities in the “unrated“ category (above) have not been rated by a rating agency; however, the investment adviser performs its own credit analysis and assigns comparable ratings that are used for compliance with the fund’s investment policies.† Includes derivatives. |
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