Investment Strategy |
Dec. 31, 2025 |
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| Western Asset Core Bond Fund | |||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||
| Strategy [Heading] | Principal investment strategies | ||||||||||||||||||
| Strategy Narrative [Text Block] | The fund invests in a portfolio of fixed income securities of various maturities and, under normal market conditions, will invest at least 80% of its net assets, including the amount of borrowing for investment purposes, if any, in debt and fixed income securities. Although the fund may invest in debt and fixed income securities of any maturity, under normal market conditions the target dollar-weighted average effective duration for the fund is expected to range within 20% of the average duration of the domestic bond market as a whole as estimated by the fund’s subadviser. Effective duration seeks to measure the expected sensitivity of market price to changes in interest rates, taking into account the anticipated effects of structural complexities (for example, some bonds can be prepaid by the issuer). The fund presently intends to limit its investments to U.S. dollar denominated securities and currently anticipates that it will generally only purchase debt securities that are rated in the Baa or BBB categories or above at the time of purchase by one or more Nationally Recognized Statistical Rating Organizations (“NRSROs”) or unrated securities of comparable quality at the time of purchase (as determined by the subadviser). These securities are known as “investment grade securities.” The fund may invest up to 25% of its total assets in the securities of non‑U.S. issuers. The fund may invest a substantial portion of its assets in mortgage-backed and asset-backed securities. The fund may also enter into various exchange-traded and over‑the‑counter derivative transactions for both hedging and non‑hedging purposes, including for purposes of enhancing returns. These derivative transactions include, but are not limited to, futures, options and swaps. In particular, the fund may use interest rate swaps, credit default swaps (including buying and selling credit default swaps on individual securities and/or baskets of securities), options (including options on credit default swaps) and futures contracts to a significant extent, although the amounts invested in these instruments may change from time to time. Other instruments may also be used to a significant extent from time to time.
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| Western Asset Core Plus Bond Fund | |||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||
| Strategy [Heading] | Principal investment strategies | ||||||||||||||||||
| Strategy Narrative [Text Block] | The fund invests in a portfolio of fixed income securities of various maturities and, under normal market conditions, will invest at least 80% of its net assets, including the amount of borrowing for investment purposes, if any, in debt and fixed income securities. Although the fund may invest in securities of any maturity, the fund normally expects to maintain a dollar-weighted average effective duration within 30% of the average duration of the domestic bond market as a whole as estimated by the fund’s subadvisers. Effective duration seeks to measure the expected sensitivity of market price to changes in interest rates, taking into account the anticipated effects of structural complexities (for example, some bonds can be prepaid by the issuer). The fund may invest up to 20% of its total assets in non-U.S. dollar denominated securities. Up to 20% of the fund’s net assets may be invested in debt securities that are not rated in the Baa or BBB categories or above at the time of purchase by one or more Nationally Recognized Statistical Rating Organizations (“NRSROs”) or, if unrated, securities of comparable quality at the time of purchase (as determined by the subadvisers). Securities rated in the Baa or BBB categories or above by one or more NRSROs or unrated securities of comparable quality are known as “investment grade securities.” Securities rated below investment grade are commonly known as “junk bonds” or “high yield securities.” The fund may invest up to 25% of its total assets in the securities of non-U.S. issuers. The fund may invest a substantial portion of its assets in mortgage-backed and asset-backed securities. The fund may also enter into various exchange-traded and over-the-counter derivative transactions for both hedging and non-hedging purposes, including for purposes of enhancing returns. These derivative transactions include, but are not limited to, futures, options, swaps, foreign currency futures and forwards. In particular, the fund may use interest rate swaps, credit default swaps (including buying and selling credit default swaps on individual securities and/or baskets of securities), options (including options on credit default swaps and options on futures) and futures contracts to a significant extent, although the amounts invested in these instruments may change from time to time. Other instruments may also be used to a significant extent from time to time.
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| Western Asset Inflation Indexed Plus Bond Fund | |||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||
| Strategy [Heading] | Principal investment strategies | ||||||||||||||||||
| Strategy Narrative [Text Block] | Under normal market conditions, the fund invests at least 80% of its net assets, including the amount of borrowing for investment purposes, if any, in inflation-indexed fixed income securities and at least 70% of its net assets in U.S. Treasury Inflation Protected Securities. The subadvisers use fundamental investment techniques to select issues. Although the fund may invest in securities of any maturity, the fund normally expects to maintain a dollar-weighted average effective duration, as estimated by the fund’s subadvisers, within 3 years of that of its benchmark, the Bloomberg U.S. Treasury: U.S. TIPS. Effective duration seeks to measure the expected sensitivity of market price to changes in interest rates, taking into account the anticipated effects of structural complexities (for example, some bonds can be prepaid by the issuer). The fund may sell protection in connection with credit default swaps relating to corporate debt securities. It is currently expected that the notional amount of the credit default swaps will not exceed 40% of the fund’s net assets, although such exposure may exceed 40% from time to time. The fund is expected to maintain a dollar-weighted average credit quality of at least A/A. In addition, under normal market conditions, at the time of purchase:
The fund considers a security to be rated below investment grade if it is not rated in the Baa/BBB categories or above by at least one Nationally Recognized Statistical Rating Organization (“NRSRO”) or is unrated and of comparable quality as determined by the subadvisers. Securities rated below investment grade are commonly known as “junk bonds” or “high yield securities.” The fund may also enter into various exchange-traded and over-the-counter derivative transactions for both hedging and non-hedging purposes, including for purposes of enhancing returns. These derivative transactions include, but are not limited to, futures, options, swaps, foreign currency futures and forwards. In particular, the fund may use interest rate swaps, credit default swaps (including buying and selling credit default swaps on individual securities and/or baskets of securities), options (including options on credit default swaps) and futures contracts to a significant extent, although the amounts invested in these instruments may change from time to time. Other instruments may also be used to a significant extent from time to time.
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