S000001256 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|
| Bloomberg Universal Index (reflects no deduction for fees, expenses, or taxes) | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 7.58% | 0.06% | 2.44% |
| Bloomberg U.S. Corporate High Yield 2% Issuer Capped Index (reflects no deduction for fees, expenses, or taxes) | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 8.62% | 4.50% | 6.52% |
| HIGH YIELD FIXED INCOME FUND | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 8.74% | 4.49% | 5.83% |
| HIGH YIELD FIXED INCOME FUND | After Taxes on Distributions | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 5.73% | 1.83% | 3.16% |
| HIGH YIELD FIXED INCOME FUND | After Taxes on Distributions and Sales | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 5.11% | 2.23% | 3.27% |