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American Mutual Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock

American Mutual Fund®

Prospectus Supplement

January 29, 2021

(for prospectus dated January 1, 2021, as supplemented to date)

 

 
Risk/Return [Heading] rr_RiskReturnHeading American Mutual Fund
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock

The table under the heading “Average annual total returns – Share class A” in the “Investment results” section of the prospectus is amended to read as follows:
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

Keep this supplement with your prospectus.
Average Annual Return, Caption rr_AverageAnnualReturnCaption Average annual total returns For the periods ended December 31, 2019 (with maximum sales charge):
American Mutual Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 14.73%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 7.97%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 10.81%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 11.51%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Feb. 21, 1950
American Mutual Fund | Class A | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 13.44%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 6.54%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 9.70%
American Mutual Fund | Class A | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 9.59%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 6.02%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.73%