020100 - Document - Risk/Return Summary {Unlabeled} - 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 A, Class C, Class F-1, Class F-2, Class F-3) link:presentationLink link:definitionLink link:calculationLink 020101 - Disclosure - Risk/Return Detail Data {Elements} - 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 A, Class C, Class F-1, Class F-2, Class F-3) link:presentationLink link:definitionLink link:calculationLink 020102 - Document - Risk/Return Summary {Unlabeled} - AMERICAN HIGH-INCOME MUNICIPAL BOND FUND (Class R6) - AMERICAN HIGH-INCOME MUNICIPAL BOND FUND (Class R-6) link:presentationLink link:definitionLink link:calculationLink 020103 - Disclosure - Risk/Return Detail Data {Elements} - AMERICAN HIGH-INCOME MUNICIPAL BOND FUND (Class R6) - AMERICAN HIGH-INCOME MUNICIPAL BOND FUND (Class R-6) link:presentationLink link:definitionLink link:calculationLink