S000000882 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended | 469 Months Ended |
|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|
| Bloomberg US Aggregate Bond Index (reflects no deductions for fees, expenses or taxes) | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 7.30% | (0.36%) | 2.01% | |
| Investor Class shares | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 2.32% | (10.37%) | (1.40%) | |
| Performance Inception Date | Dec. 06, 1986 | |||
| Investor Class shares | After Taxes on Distributions | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 0.69% | (11.38%) | (2.67%) | |
| Performance Inception Date | Dec. 06, 1986 | |||
| Investor Class shares | After Taxes on Distributions and Sales | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 1.38% | (7.78%) | (1.26%) | |
| Performance Inception Date | Dec. 06, 1986 |