Tax-Exempt Fund of California Class A Class C Class F-1 Class F-2 Class F-3 Risks of investing in municipal bonds of issuers within the state of California [Member] Market conditions [Member] Issuer risks [Member] Investing in municipal securities [Member] Investing in debt instruments [Member] Liquidity risk [Member] Credit and liquidity support [Member] Investing in lower rated debt instruments [Member] Investing in similar municipal bonds [Member] Insured municipal bonds [Member] Management [Member] Bloomberg Municipal Bond Index (reflects no deductions for sales charges, account fees, expenses or U.S. federal income taxes) Bloomberg California Municipal Index (reflects no deductions for sales charges, account fees, expenses or U.S. federal income taxes) Investing In Lower Rated Debt Instruments Member C000025172 Member Issuer Risks Member C000068592 Member Credit And Liquidity Support Member index_ Bloomberg_ Municipal_ Bond_ Index_reflects_no_deductions_for_sales_charges_account_fees_expenses_or_ US_federal_income_taxes Member C000180000 Member Risks Of Investing In Municipal Bonds Of Issuers Within The State Of California Member Market Conditions Member C000025170 Member Insured Municipal Bonds Member S000009239 Member Investing In Similar Municipal Bonds Member index_ Bloomberg_ California_ Municipal_ Index_reflects_no_deductions_for_sales_charges_account_fees_expenses_or_ US_federal_income_taxes Member ManagementMember Investing In Debt Instruments Member C000025173 Member Investing In Municipal Securities Member Liquidity Risk Member