S000001588 [Member] Fees and Expenses - International Developed Markets Fund	Oct. 31, 2025 USD ($)
Prospectus [Line Items]
Expense Heading [Optional Text]	Fees and Expenses of the Fund
Expense Narrative [Text Block]	The following tables describe the fees and expenses that you may pay if you buy, hold, and sell Shares of the Fund. In addition to the fees and expenses described below, you may also be required to pay brokerage commissions on purchases and sales of Class S Shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Russell Investment Company Funds. In addition, certain Financial Intermediaries (as defined below in the Additional Information section) may impose different sales loads and waivers. More information about these and other discounts is available from your financial professional and in the Front-End Sales Charges and More About Deferred Sales Charges sections and Appendix A: Additional Information About Financial Intermediary-Specific Sales Charge Variations, Waivers and Discounts, beginning on pages 282, 286 and 365, respectively, of the Prospectus, and in the Purchase, Exchange and Redemption of Fund Shares section, beginning on page 33, of the Fund’s Statement of Additional Information. Please see the Expense Notes section of the Fund’s Prospectus for further information regarding expenses of the Fund.
Expense Breakpoint Discounts [Text]	You may qualify for sales charge discounts if you and your familyinvest, or agree to invest in the future, at least $50,000 in Russell Investment Company Funds.
Expense Breakpoint, Minimum Investment Required [Amount]	$ 50,000
Other Expenses, New Fund, Based on Estimates [Text]	“Other Expenses” for Class R6 Shares are based on estimated amounts for the current fiscal year as this Share Class did not have any assets during the most recent fiscal year.
Shareholder Fees Caption [Optional Text]	Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Optional Text]	Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)#
Expense Example [Heading]	Example
Expense Example Narrative [Text Block]	This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your Shares at the end of those periods. The example also assumes your investment has a 5% return each year and that operating expenses remain the same. The calculation of costs for the one year period takes into account the effect of any current contractual fee waivers and/or reimbursements. The calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. Although your actual costs may be higher or lower, under these assumptions your costs would be:
Portfolio Turnover [Heading]	Portfolio Turnover
Portfolio Turnover [Text Block]	The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund Shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 32% of the average value of its portfolio.
Portfolio Turnover, Rate	32.00%

S000001588 [Member] Fees and Expenses - International Developed Markets Fund

Oct. 31, 2025

USD ($)

Fees and Expenses of the Fund

The following tables describe the fees and expenses that you may pay if you buy, hold, and sell Shares of the Fund. In addition to the fees and expenses described below, you may also be required to pay brokerage commissions on purchases and sales of Class S Shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Russell Investment Company Funds. In addition, certain Financial Intermediaries (as defined below in the Additional Information section) may impose different sales loads and waivers. More information about these and other discounts is available from your financial professional and in the Front-End Sales Charges and More About Deferred Sales Charges sections and Appendix A: Additional Information About Financial Intermediary-Specific Sales Charge Variations, Waivers and Discounts, beginning on pages 282, 286 and 365, respectively, of the Prospectus, and in the Purchase, Exchange and Redemption of Fund Shares section, beginning on page 33, of the Fund’s Statement of Additional Information. Please see the Expense Notes section of the Fund’s Prospectus for further information regarding expenses of the Fund.

Expense Breakpoint Discounts [Text]

You may qualify for sales charge discounts if you and your familyinvest, or agree to invest in the future, at least $50,000 in Russell Investment Company Funds.

Expense Breakpoint, Minimum Investment Required [Amount]

$ 50,000

Other Expenses, New Fund, Based on Estimates [Text]

“Other Expenses” for Class R6 Shares are based on estimated amounts for the current fiscal year as this Share Class did not have any assets during the most recent fiscal year.

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Optional Text]

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)#

Expense Example [Heading]

Example

Expense Example Narrative [Text Block]

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your Shares at the end of those periods. The example also assumes your investment has a 5% return each year and that operating expenses remain the same. The calculation of costs for the one year period takes into account the effect of any current contractual fee waivers and/or reimbursements. The calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods.

Although your actual costs may be higher or lower, under these assumptions your costs would be:

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund Shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 32% of the average value of its portfolio.

Portfolio Turnover, Rate

32.00%