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S000000716 [Member] Average Annual Total Returns
12 Months Ended 60 Months Ended 120 Months Ended
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Bloomberg U.S. Aggregate Index (reflects no deduction for fees, expenses or taxes)      
Prospectus [Line Items]      
Average Annual Return, Percent [1] 1.25% (0.33%) 1.35%
Bloomberg U.S. Corporate High Yield—2% Issuer Cap Index (reflects no deduction for fees, expenses or taxes)      
Prospectus [Line Items]      
Average Annual Return, Percent [1] 8.19% 4.20% 5.16%
Class IS      
Prospectus [Line Items]      
Average Annual Return, Percent [1] 8.55% 3.54% 4.37%
Class A      
Prospectus [Line Items]      
Average Annual Return, Percent [1] 4.15% 2.32% 3.59%
Class C      
Prospectus [Line Items]      
Average Annual Return, Percent [1] 6.27% 2.42% 3.24%
Class R      
Prospectus [Line Items]      
Average Annual Return, Percent [1] 7.85% 2.88% 3.71%
Class I      
Prospectus [Line Items]      
Average Annual Return, Percent [1] 8.46% 3.47% 4.30%
Class I | After Taxes on Distributions      
Prospectus [Line Items]      
Average Annual Return, Percent [1] 5.12% 0.85% 1.69%
Class I | After Taxes on Distributions and Sales      
Prospectus [Line Items]      
Average Annual Return, Percent [1] 4.93% 1.49% 2.10%
[1]
The total returns include gains from the settlement of securities litigation. Without these gains, total returns would have been lower.