S000050481 [Member] Investment Strategy - S000050481 [Member]	Mar. 31, 2026
Prospectus [Line Items]
Strategy [Heading]	Principal Investment Strategies
Strategy Narrative [Text Block]	The Fund is an exchange-traded fund (ETF). The Fund seeks to achieve its investment objective by attempting to replicate the performance of the Index through investments in equity securities, including, but not limited to, common shares traded on local exchanges, American Depositary Receipts (ADRs) and Global Depositary Receipts (GDRs). Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in the companies included in the Index and generally expects to be substantially invested at such times, with at least 95% of its net assets invested in these securities. These companies are domiciled in emerging market countries, excluding companies domiciled, or whose stock is listed for trading on an exchange, in China, as well as companies domiciled in Hong Kong. The Fund defines “emerging market” countries as those that are in the intermediate stages of their economic development and classified by Columbia Management Investment Advisers, LLC (Columbia Management or the Investment Manager) as “Emerging Markets.” The Fund may invest in companies of all capitalization sizes, which includes small capitalization (small cap) companies (i.e., those with market capitalizations between U.S. $100 million and U.S. $2 billion), mid-capitalization (mid cap) companies (i.e., those with market capitalizations between U.S. $2 billion and U.S. $10 billion) as well as large capitalization companies. A substantial portion of the Fund’s assets are denominated in currencies other than the U.S. dollar. The Fund typically utilizes a “representative sampling” strategy whereby the Fund invests in some, but not all, of the component securities of the Index, that collectively, in the opinion of the Investment Manager, have an investment profile similar to that of the Index. As such, the Fund may not track the Index with the same degree of accuracy as would an investment vehicle replicating (or investing in) the entire Index. Under certain circumstances or conditions or due to other factors, including, for example, the size of the Fund’s portfolio, the Fund may use a full replication strategy, which means that the Fund will seek to track the performance of the Index by investing all, or substantially all, of its assets in the securities that make up the Index in approximately the same proportion as their weighting in the Index. When securities are deleted from the Index, the Investment Manager will typically remove these securities from the Fund’s portfolio. However, in the discretion of the Investment Manager, the Fund may remain invested in securities that were deleted from the Index until the next rebalancing of the Fund. The Fund invests in specific countries or geographic regions to approximately the same extent as the Index. The Fund concentrates its investments (i.e., holds 25% or more of its net assets) in a particular industry or group of industries or even issuers to approximately the same extent that the Index is concentrated. As of March 31, 2026, the Index (and therefore the Fund) was concentrated in the financials and information technology sectors.

The Fund is an exchange-traded fund (ETF). The Fund seeks to achieve its investment objective by attempting to replicate the performance of the Index through investments in equity securities, including, but not limited to, common shares traded on local exchanges, American Depositary Receipts (ADRs) and Global Depositary Receipts (GDRs).

Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in the companies included in the Index and generally expects to be substantially invested at such times, with at least 95% of its net assets invested in these securities. These companies are domiciled in emerging market countries, excluding companies domiciled, or whose stock is listed for trading on an exchange, in China, as well as companies domiciled in Hong Kong. The Fund defines “emerging market” countries as those that are in the intermediate stages of their economic development and classified by Columbia Management Investment

Advisers, LLC (Columbia Management or the Investment Manager) as “Emerging Markets.” The Fund may invest in companies of all capitalization sizes, which includes small capitalization (small cap) companies (i.e., those with market capitalizations between U.S. $100 million and U.S. $2 billion), mid-capitalization (mid cap) companies (i.e., those with market capitalizations between U.S. $2 billion and U.S. $10 billion) as well as large capitalization companies. A substantial portion of the Fund’s assets are denominated in currencies other than the U.S. dollar.

The Fund typically utilizes a “representative sampling” strategy whereby the Fund invests in some, but not all, of the component securities of the Index, that collectively, in the opinion of the Investment Manager, have an investment profile similar to that of the Index. As such, the Fund may not track the Index with the same degree of accuracy as would an investment vehicle replicating (or investing in) the entire Index. Under certain circumstances or conditions or due to other factors, including, for example, the size of the Fund’s portfolio, the Fund may use a full replication strategy, which means that the Fund will seek to track the performance of the Index by investing all, or substantially all, of its assets in the securities that make up the Index in approximately the same proportion as their weighting in the Index. When securities are deleted from the Index, the Investment Manager will typically remove these securities from the Fund’s portfolio. However, in the discretion of the Investment Manager, the Fund may remain invested in securities that were deleted from the Index until the next rebalancing of the Fund.

The Fund invests in specific countries or geographic regions to approximately the same extent as the Index. The Fund concentrates its investments (i.e., holds 25% or more of its net assets) in a particular industry or group of industries or even issuers to approximately the same extent that the Index is concentrated. As of March 31, 2026, the Index (and therefore the Fund) was concentrated in the financials and information technology sectors.