S000010030 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended | ||
|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
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| Bloomberg US Aggregate Bond Index | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 7.30% | (0.36%) | 2.01% | |
| Shares | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 7.11% | 0.23% | 2.46% | ||
| Shares | After Taxes on Distributions | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 5.56% | (1.08%) | 1.12% | ||
| Shares | After Taxes on Distributions and Sales | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 4.19% | (0.39%) | 1.30% | ||
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