AMCAP FUND Class A Class 529-A Class C Class 529-C Class 529-E Class 529-T Class T Class F-1 Class 529-F-1 Class F-2 Class F-3 Class 529-F-2 Class 529-F-3 Class R-1 Class R-2 Class R-3 Class R-4 Class R-5 Class R-6 Class R-2E Class R-5E Market conditions [Member] Issuer risks [Member] Investing in growth-oriented stocks [Member] Investing outside the United States [Member] Management [Member] S&P 500 Index (reflects no deductions for sales charges, account fees, expenses or U.S. federal income taxes) C000076711 Member C000164827 Member C000024007 Member C000189473 Member Market Conditions Member C000024012 Member C000024014 Member C000179992 Member C000024004 Member C000148384 Member C000220528 Member Investing In Growthoriented Stocks Member C000068557 Member S000008817 Member index_ SP_500_ Index_reflects_no_deductions_for_sales_charges_account_fees_expenses_or_ US_federal_income_taxes Member Issuer Risks Member C000189472 Member C000024008 Member C000024011 Member C000024003 Member C000024016 Member C000024006 Member C000024005 Member ManagementMember C000024015 Member C000220529 Member Investing Outside The United States Member C000024010 Member