S000001599 [Member] Investment Objectives and Goals - Tax-Exempt Bond Fund |
Oct. 31, 2025 |
|---|---|
| Prospectus [Line Items] | |
| Risk/Return [Heading] | Tax-Exempt Bond Fund |
| Objective [Heading] | Investment Objective (Fundamental) |
| Objective, Primary [Text Block] | The Fund seeks to provide federal tax-exempt current income consistent with the preservation of capital. The Fund will invest, under normal circumstances, at least 80% of the value of its assets in investments the income from which is exempt from federal income tax.
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