Expense Example, No Redemption - AMERICAN HIGH-INCOME MUNICIPAL BOND FUND (Class A, Class C, Class F-1, Class F-2, Class F-3) - AMERICAN HIGH-INCOME MUNICIPAL BOND FUND - Class C |
Sep. 30, 2026
USD ($)
|
|---|---|
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | $ 139 |
| Expense Example, No Redemption, 3 Years | 434 |
| Expense Example, No Redemption, 5 Years | 750 |
| Expense Example, No Redemption, 10 Years | $ 1,454 |