INCOME FUND OF AMERICA Class A Class 529-A Class C Class 529-C Class 529-E Class 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 debt instruments [Member] Investing in lower rated debt instruments [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) 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index (reflects no deductions for sales charges, account fees, expenses or U.S. federal income taxes) Bloomberg U.S. Aggregate Index (reflects no deductions for sales charges, account fees, expenses or U.S. federal income taxes) C000023990 Member index_ Bloomberg_ US_ Aggregate_ Index_reflects_no_deductions_for_sales_charges_account_fees_expenses_or_ US_federal_income_taxes Member C000023985 Member Market Conditions Member S000008814 Member C000223653 Member C000164804 Member Investing In Incomeoriented Stocks Member C000023989 Member C000148385 Member C000023992 Member C000023994 Member C000023997 Member C000023987 Member C000077898 Member index_ SP_500_ Index_reflects_no_deductions_for_sales_charges_account_fees_expenses_or_ US_federal_income_taxes Member Investing In Lower Rated Debt Instruments Member C000023996 Member Issuer Risks Member C000023986 Member C000223654 Member C000179951 Member ManagementMember Investing In Debt Instruments Member C000068581 Member C000023988 Member Investing Outside The United States Member index_6535_ SP_500_ Index Bloomberg_ US_ Aggregate_ Index_reflects_no_deductions_for_sales_charges_account_fees_expenses_or_ US_federal_income_taxes Member C000023993 Member