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S000005533 [Member] Average Annual Total Returns
 12 Months Ended 60 Months Ended 120 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Bloomberg Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)      
Prospectus [Line Items]      
Average Annual Return, Percent 7.30% (0.36%) 2.01%
Class A Shares      
Prospectus [Line Items]      
Average Annual Return, Percent 1.79% (1.48%) 1.16%
Class I Shares      
Prospectus [Line Items]      
Average Annual Return, Percent 6.81% (0.26%) 1.97%
Class I Shares | After Taxes on Distributions      
Prospectus [Line Items]      
Average Annual Return, Percent [1] 5.20% (1.44%) 0.86%
Class I Shares | After Taxes on Distributions and Sales      
Prospectus [Line Items]      
Average Annual Return, Percent [1] 4.01% (0.71%) 1.03%
[1] After-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds Fund shares in a tax-advantaged account, such as an individual retirement account or a 401(k) plan.