The investment seeks an annual rate of total return, before fund expenses, greater than the annual rate of total return of the Bloomberg Barclays U.S. Universal Bond Index. The fund normally invests at least 80% of its net assets in the following types of U.S. dollar-denominated debt obligations: U.S. government and other public-sector entities; asset-backed and mortgage-backed obligations of U.S. and foreign issuers; corporate debt of U.S. and foreign issuers. It invests primarily in investment-grade debt obligations, but may invest up to 20% of its net assets in non-investment grade debt obligations (sometimes referred to as "high yield" or "junk" bonds).