S000001587 [Member] Investment Strategy - Investment Grade Bond Fund	Oct. 31, 2025
Prospectus [Line Items]
Strategy [Heading]	Investments, Risks and Performance Principal Investment Strategies of the Fund
Strategy Narrative [Text Block]	The Fund has a non-fundamental policy to invest, under normal circumstances, at least 80% of the value of its net assets plus borrowings for investment purposes in investment grade bonds. Bonds are fixed income and floating rate securities representing debt obligations that typically require the issuer to repay the bondholders the principal amount borrowed and generally to pay interest. The Fund considers bonds to include fixed income equivalent instruments, which may be represented by forwards or derivatives such as options, futures contracts, or swap agreements. The Fund considers “investment grade” to mean either that a nationally recognized statistical rating organization has rated the securities Baa3 or BBB- (or the equivalent) or better or the securities have been determined to be of comparable quality. Russell Investment Management, LLC (“RIM”) provides or oversees the provision of all investment advisory and portfolio management services for the Fund. The Fund is advised by RIM and multiple money managers unaffiliated with RIM pursuant to a multi-manager approach. RIM may change the Fund’s asset allocation at any time. The Fund’s money managers select the individual portfolio instruments for the assets assigned to them. RIM manages assets not allocated to money manager strategies and utilizes quantitative and/or rules-based processes and qualitative analysis to assess Fund characteristics and invest in securities and instruments which provide the desired exposures. RIM may use strategies based on indexes. RIM also manages the Fund's cash balances. RIM determines the Fund’s allocations to fixed income sectors, money manager strategies and RIM’s strategies based on RIM’s target strategic asset allocation, portfolio construction tools and Fund-level guidelines. The portfolio construction process involves an analysis of tradeoffs between various risk and return factors as well as turnover and transaction costs to estimate optimal portfolio positioning. The Fund may invest in mortgage related securities, including mortgage-backed securities. The Fund may also invest in (1) U.S. and non-U.S. corporate debt securities, (2) Yankee Bonds (dollar-denominated obligations issued in the U.S. by non-U.S. banks and corporations), (3) fixed income securities issued or guaranteed by the U.S. government, non-U.S. governments, or by any U.S. government or non-U.S. government agency or instrumentality and (4) asset-backed securities. The Fund will invest principally in securities of “investment grade” quality at the time of purchase. The Fund may invest in currency futures and options on futures, forward currency contracts, currency swaps and currency options for speculative purposes or to seek to protect a portion of its investments against adverse currency exchange rate changes. The Fund may invest in derivative instruments and may use derivatives to take both long and short positions. The Fund’s use of derivatives may cause the Fund’s investment returns to be impacted by the performance of securities the Fund does not own and result in the Fund’s total investment exposure exceeding the value of its portfolio. The duration of the Fund's portfolio will typically be within one year of the duration of the Bloomberg U.S. Aggregate Bond Index, but may vary up to two years from the Index's duration. The Fund has no restrictions on the maturity of securities in which it invests or on the maturity of its overall portfolio. A portion of the Fund’s net assets may be “illiquid” investments. The Fund may invest in variable and floating rate securities. The Fund may purchase loans and other direct indebtedness. The Fund may invest in non-U.S. debt securities, including developed and emerging market debt securities, some of which may be non-U.S. dollar denominated. The Fund considers the following countries to have developed markets: Australia, Austria, Belgium, Canada, Denmark, Finland, France, Germany, Hong Kong, Ireland, Israel, Italy, Japan, Luxembourg, the Netherlands, New Zealand, Norway, Portugal, Singapore, Spain, Sweden, Switzerland, the United Kingdom and the United States. As a general rule, the Fund considers emerging market countries to include every other country. The Fund may enter into repurchase agreements. The Fund may invest in commercial paper, including asset-backed commercial paper. The Fund may invest in obligations issued or guaranteed by U.S. or foreign banks. The Fund usually, but not always, exposes a portion of its cash to changes in interest rates or market/sector returns by purchasing fixed income securities and/or derivatives, which typically include exchange traded fixed income futures contracts, to be announced (“TBA”) securities and swaps. Please refer to the “Investment Objective and Investment Strategies” section in the Fund's Prospectus for further information.

The Fund has a non-fundamental policy to invest, under normal circumstances, at least 80% of the value of its net assets plus borrowings for investment purposes in investment grade bonds. Bonds are fixed income and floating rate securities representing debt obligations that typically require the issuer to repay the bondholders the principal amount borrowed and generally to pay interest. The Fund considers bonds to include fixed income equivalent instruments, which may be represented by forwards or derivatives such as options, futures contracts, or swap agreements. The Fund considers “investment grade” to mean either that a nationally recognized statistical rating organization has rated the securities Baa3 or BBB- (or the equivalent) or better or the securities have been determined to be of comparable quality.

Russell Investment Management, LLC (“RIM”) provides or oversees the provision of all investment advisory and portfolio management services for the Fund. The Fund is advised by RIM and multiple money managers unaffiliated with RIM pursuant to a multi-manager approach. RIM may change the Fund’s asset allocation at any time. The Fund’s money managers select the individual portfolio instruments for the assets assigned to them. RIM manages assets not allocated to money manager strategies and utilizes quantitative and/or rules-based processes and qualitative analysis to assess Fund characteristics and invest in securities and instruments which provide the desired exposures. RIM may use strategies based on indexes. RIM also manages the Fund's cash balances.

The Fund may invest in mortgage related securities, including mortgage-backed securities. The Fund may also invest in (1) U.S. and non-U.S. corporate debt securities, (2) Yankee Bonds (dollar-denominated obligations issued in the U.S. by non-U.S. banks and corporations), (3) fixed income securities issued or guaranteed by the U.S. government, non-U.S. governments, or by any U.S. government or non-U.S. government agency or instrumentality and (4) asset-backed securities. The Fund will invest principally in securities of “investment grade” quality at the time of purchase. The Fund may invest in currency futures and options on futures, forward currency contracts, currency swaps and currency options for speculative purposes or to seek to protect a portion of its investments against adverse currency exchange rate changes. The Fund may invest in derivative instruments and may use derivatives to take both long and short positions. The Fund’s use of derivatives may cause the Fund’s investment returns to be impacted by the performance of securities the Fund does not own and result in the Fund’s total investment exposure exceeding the value of its portfolio. The duration of the Fund's portfolio will typically be within one year of the duration of the Bloomberg U.S. Aggregate Bond Index, but may vary up to two years from the Index's duration. The Fund has no restrictions on the maturity of securities in which it invests or on the maturity of its overall portfolio. A portion of the Fund’s net assets may be “illiquid” investments. The Fund may invest in variable and floating rate securities. The Fund may purchase loans and other direct indebtedness. The Fund may invest in non-U.S. debt securities, including developed and emerging market debt securities, some of which may be non-U.S. dollar denominated. The Fund considers the following countries to have developed markets: Australia, Austria, Belgium, Canada, Denmark, Finland, France, Germany, Hong Kong, Ireland, Israel, Italy, Japan, Luxembourg, the Netherlands, New Zealand, Norway, Portugal, Singapore, Spain, Sweden, Switzerland, the United Kingdom and the United States. As a general rule, the Fund considers emerging market countries to include every other country. The Fund may enter into repurchase agreements. The Fund may invest in commercial paper, including asset-backed commercial paper. The Fund may invest in obligations issued or guaranteed by U.S. or foreign banks. The Fund usually, but not always, exposes a portion of its cash to changes in interest rates or market/sector returns by purchasing fixed income securities and/or derivatives, which typically include exchange traded fixed income futures contracts, to be announced (“TBA”) securities and swaps. Please refer to the “Investment Objective and Investment Strategies” section in the Fund's Prospectus for further information.