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Investment Risks - American Century ETF Trust - American Century Emerging Markets Insights ETF
Sep. 15, 2026
Foreign Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Foreign Risk – Foreign securities are generally riskier than U.S. securities. Political events (such as civil unrest, national elections and imposition of exchange controls), social and economic events (such as labor strikes and rising inflation), natural disasters and public health emergencies occurring in a country where the fund invests could cause the fund’s investments in that country to experience gains or losses. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. ADRs representing foreign securities may be subject to additional risks, including the risk that the ADRs may not track the price of the underlying foreign securities on which they are based, and the risk that their value may change materially at times when U.S. markets are not open for trading.
Currency Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Currency Risk – The fund could experience gains or losses based solely on changes in the exchange rate between foreign currencies and the U.S. dollar.
Emerging Markets Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Emerging Markets Risk — Investing in emerging market countries generally is riskier than investing in foreign developed countries due to lower liquidity, market manipulation concerns, limited reliable access to capital, and differing company organizational structures. Emerging market countries may have unstable governments, economies that are subject to sudden change, and significant volatility in their financial markets. These countries also may lack the legal, business and social framework to support securities markets. Additionally, certain jurisdictions do not provide the Public Company Accounting Oversight Board (PCAOB) with sufficient access to inspect audit work papers and practices, or otherwise do not cooperate with U.S. regulators, potentially exposing investors in U.S. capital markets to significant risks.
Growth Stocks Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Growth Stocks Risk — Investments in growth stocks may be more volatile than other stocks and the overall stock market. These stocks are typically priced higher than other stocks because of their growth potential, which may or may not be realized.
Frontier Emerging Markets Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Frontier Emerging Markets Risk — The risks of investing in a frontier emerging market are magnified because they generally have smaller economies and less developed capital markets than traditional emerging markets. Unique risks include: potential for extreme price volatility and illiquidity, government control of certain industries or companies and limitations on foreign investment, economic and political instability, and relatively new and unsettled securities laws.
Single Country Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Single Country Risk — Investing a significant portion of assets in one country or region makes the fund more dependent upon the political and economic circumstances of that particular country or region than a fund that is more widely diversified.
Greater China Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Greater China Risk — Investing in Chinese securities is riskier than investing in U.S. securities. Investing in China involves risk of loss due to nationalization, expropriation, and confiscation of assets and property. Losses may also occur due to new or expanded restrictions on foreign investments or repatriation of capital. Due to Chinese governmental restrictions on foreign ownership of companies in certain industries, Chinese operating companies often use variable interest entity (VIE) structures to raise capital from international investors. Shares of VIEs are not equity ownership interests in Chinese operating companies. The Chinese government has never explicitly approved these structures and thus could determine that the underlying contractual arrangements on which control of the VIE is based violate Chinese law. Such determination from the Chinese government could result in a loss in the value of an investment in a U.S.-listed company that utilizes the VIE structure. Additionally, the Chinese market is subject to less regulation and oversight than the U.S market. US regulators have limited ability to inspect international auditing standards of U.S. companies operating in China, thus there is substantially greater risk that disclosures will be incomplete or misleading and, in the event of investor harm, substantially less access to recourse.
Style Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Style Risk — If at any time the market is not favoring the fund’s growth investment style, the fund’s gains may not be as big as, or its losses may be bigger than, those of other equity funds using different investment styles.
Market Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Market Risk – The value of the fund’s shares will go up and down based on the performance of the companies whose securities it owns and other factors generally affecting the securities market. Market risks, including political, regulatory, economic and social developments, can affect the value of the fund’s investments. Natural disasters, public health emergencies, war, terrorism and other unforeseeable events may lead to increased market volatility and may have adverse long-term effects on world economies and markets generally.
Market Trading Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Market Trading Risk – The fund faces numerous market trading risks, including the potential lack of an active market for fund shares, losses investors may face from trading fund shares in secondary markets, periods of high volatility and disruption in the creation and/or redemption process of the fund. Any of these factors, among others, may lead to the fund’s shares trading at a premium or discount to NAV. Thus, you may pay more (or less) than NAV when you buy shares of the fund in the secondary market, and you may receive less (or more) than NAV when you sell those shares in the secondary market. The portfolio managers cannot predict whether shares will trade above (premium), below (discount) or at NAV.
Active Management Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Active Management Risk – Due to its active management strategy, the fund could underperform its performance benchmark and/or other funds with similar investment objectives and/or strategies.
Price Volatility Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Price Volatility Risk – The value of the fund’s shares may fluctuate significantly in the short term. The value of the fund’s shares depends on the value of the stocks and other securities it owns. The value of the individual securities the fund owns will go up and down depending on the performance of the companies that issued them, general market and economic conditions, and investor confidence.
Cash Transactions Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Cash Transactions Risk – The fund may effect its creations and redemptions for cash, rather than for in-kind securities. Therefore, it may be required to sell portfolio securities and subsequently recognize gains on such sales that the fund might not have recognized if it were to distribute portfolio securities in-kind. As such, investments in fund shares may be less tax-efficient than an investment in an ETF that distributes portfolio securities entirely in-kind. Cash transactions may have to be carried out over several days if the securities market is relatively illiquid and may involve considerable brokerage fees and taxes. Brokerage fees and taxes will be higher than if the fund sold and redeemed shares in-kind.
Authorized Participant Concentration Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Authorized Participant Concentration Risk – Only an authorized participant may engage in creation or redemption transactions directly with the fund. The fund may have a limited number of institutions that act as authorized participants. To the extent that these institutions exit the business or are unable to proceed with creation and/or redemption orders with respect to the fund and no other authorized participant is able to step forward to process creation and/or redemption orders, fund shares may trade at a discount to net asset value (NAV) and possibly face trading halts and/or delisting. This risk may be more pronounced in volatile markets, potentially where there are significant redemptions in ETFs generally.
Large Shareholder Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Large Shareholder Risk – Certain shareholders, including other funds advised by the advisor, may from time to time own a substantial amount of the shares of the fund. In addition, a third party investor, the advisor or an affiliate of the advisor, an authorized participant, a market maker, or another entity may invest in the fund and hold its investment for a limited period of time solely to facilitate commencement of the fund or to facilitate the fund’s achieving a specified size or scale. There can be no assurance that any large shareholder would not redeem its investment, that the size of the fund would be maintained at such levels or that the fund would continue to meet applicable listing requirements. Redemptions by large shareholders could have a significant negative impact on the fund. In addition, transactions by large shareholders may account for a large percentage of the trading volume on The NASDAQ Stock Market LLC (NASDAQ) and may therefore have a material upward or downward effect on the market price of the shares.
Sector Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Sector Risk – If the fund is overweighted in a stock or sector, any negative development related to that stock or sector will have a greater impact on the fund than other funds that are not overweighted in that stock or sector.
Redemption Risk Member  
Prospectus [Line Items]  
Risk [Text Block] Redemption Risk – The fund may need to sell securities at times it would not otherwise do so in order to meet shareholder redemption requests. Selling securities to meet such redemptions may cause the fund to experience a loss, increase the fund’s transaction costs and/or have adverse tax consequences. Redemption activity can occur for many reasons, including shareholder reactions to market events or product changes. To the extent that a large shareholder (including the advisor, another account advised by the advisor, a fund of funds or 529 college savings plan) invests in the fund, the fund may experience relatively large redemptions as such shareholder reallocates its assets.
Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] Principal Loss Risk – At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund.
Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items]  
Risk [Text Block]
An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.