INVESTMENT CO OF AMERICA 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 income-oriented stocks [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) C000026218 Member C000026221 Member C000026226 Member C000026223 Member C000164820 Member C000189430 Member Market Conditions Member Investing In Incomeoriented Stocks Member Investing In Growthoriented Stocks Member index_ SP_500_ Index_reflects_no_deductions_for_sales_charges_account_fees_expenses_or_ US_federal_income_taxes Member C000026225 Member C000026215 Member Issuer Risks Member C000180008 Member S000009597 Member C000068572 Member C000026222 Member C000148444 Member C000224626 Member C000077857 Member C000026217 Member C000026227 Member C000189431 Member C000026214 Member ManagementMember C000224625 Member C000026216 Member C000026219 Member Investing Outside The United States Member