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S000071711 [Member] Investment Risks - Putnam Sustainable Future ETF
Aug. 31, 2025
Arbitrage risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Arbitrage risk: Unlike ETFs that publicly disclose their complete portfolio holdings each business day, the fund provides certain other information intended to allow market participants to estimate the value of positions in the fund’s shares. Although this information is designed to facilitate arbitrage opportunities in the fund’s shares to reduce bid/ask spreads and minimize
discounts or premiums between the market price and net asset value of the fund’s shares, there is no guarantee the fund’s arbitrage mechanism will operate as intended and that the fund will not experience wide bid/ask spreads and/or large discounts or premiums to net asset value. In addition, market participants may attempt to use the disclosed information to “reverse engineer”the fund’s trading strategy, which, if successful, could increase opportunities for predatory trading practices that may have the potential to negatively impact the fund’s performance.
Fluctuation of net asset value and share price risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Fluctuation of net asset value and share price risk: Shares may trade at a larger premium or discount to the fund’s net asset value than shares of other ETFs, including ETFs that make their daily holdings public. The net asset value of the fund will generally fluctuate with changes in the market value of the fund’s holdings. The fund’s shares can be bought and sold in the secondary market at market prices. Disruptions to creations and redemptions, the existence of extreme market volatility or potential lack of an active trading market for the fund’s shares may result in the fund’s shares trading significantly above (at a premium) or below (at a discount) net asset value or the intraday value of the fund’s holdings. In addition, in stressed market conditions or periods of market disruption or volatility, the market for fund shares may become less liquid in response to deteriorating liquidity in the markets for the fund’s underlying portfolio holdings.
Trading issues risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Trading issues risk: The fund has a limited public trading history and will operate differently from other actively managed ETFs that publish their portfolio holdings on a daily basis. There can be no assurance that an active trading market will develop or be maintained or that the market for fund shares will operate as intended, which could lead to the fund’s shares trading at wider spreads and larger premiums and discounts to net asset value than other actively managed ETFs that publish their portfolio holdings on a daily basis, particularly during periods of market disruption or volatility. As a result, it may cost investors more to trade fund shares than shares of other ETFs. There is no guarantee that the fund will be able to attract market makers and authorized participants. Market makers and authorized participants are not obligated to make a market in the fund’s shares or to submit purchase and redemption orders for creation units.
The market prices of the fund’s shares are expected to fluctuate, in some cases materially, in response to changes in the fund’s net asset value, the intraday value of the fund’s holdings and supply and demand for the fund’s shares. The Investment Manager cannot predict whether the fund’s shares will trade above, below or at their net asset value or the intraday value of the fund’s holdings. During periods when the fund is trading below its net asset value, investors may incur significant losses if they sell shares.
The securities held by the fund may be traded in markets that close at a different time than the exchange on which the fund’s shares are listed. Liquidity in those securities may be reduced after the applicable closing times. Accordingly, during the time when the exchange is open but after the applicable market closing, fixing or settlement times, bid-ask spreads on the
exchange and the corresponding premium or discount to the shares’net asset value may widen.
Trading halt risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Trading halt risk: There may be circumstances where a security held in the fund’s portfolio but not in the Tracking Basket does not have readily available market quotations. If the Investment Manager determines that such circumstance may affect the reliability of the Tracking Basket as an arbitrage vehicle, that information, along with the identity and weighting of that security in the fund’s portfolio, will be publicly disclosed on the fund’s website, and the Investment Manager will assess appropriate remedial measures. In these circumstances, market participants may use this information to engage in certain predatory trading practices that may have the potential to harm the fund and its shareholders. In addition, if securities representing 10% or more of the fund’s portfolio do not have readily available market quotations, the fund’s Investment Manager would promptly request the exchange to halt trading of the fund, meaning that investors (including the fund) would not be able to trade their shares. Trading may also be halted in other circumstances, for example, due to market conditions.
Large shareholder transaction risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Large shareholder transaction risk: The fund is subject to the risk that shareholders will purchase or redeem large quantities of shares of the fund. The fund may be an investment option for mutual funds that are managed by the Investment Manager, as defined below, and its affiliates as “funds of funds.” Additionally, other investors from time to time may make substantial investments in the fund. Such shareholders may at times be considered to control the fund. In addition, a large number of shareholders may collectively purchase or redeem fund shares in large amounts rapidly or unexpectedly. Large shareholder transactions may adversely affect the fund’s liquidity and net assets. These redemptions may also adversely affect the fund’s performance if the fund is forced to sell securities, which may also increase the fund’s brokerage costs.
Authorized participant concentration risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Authorized participant concentration risk: Only an authorized participant may engage in creation and redemption transactions directly with the fund. The fund may have a limited number of financial institutions that act as authorized participants, none of which are obligated to engage in creation and/or redemption transactions. To the extent that those authorized participants do not engage in creation and redemption orders, there may be a significantly diminished trading market for fund shares or fund shares may trade at a discount (or premium) to net asset value and possibly face trading halts and/or de-listing. This risk may be heightened due to the fact that the fund has a novel and unique structure and does not disclose its portfolio holdings daily, unlike certain other actively managed ETFs, and could be greater during market disruptions or periods of volatility and in scenarios where authorized participants have limited or diminished access to the capital required to post collateral.
Cash transactions risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Cash transactions risk: Unlike certain ETFs, the fund may effect creations and redemptions in cash or partially in cash. 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 the fund’s shares may be less tax-efficient than an investment in an ETF that distributes portfolio securities entirely in-kind.
Market risks [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Market risk: The value of investments in the fund’s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, outbreaks of infectious illnesses or other widespread public health issues, and factors related to a specific issuer, asset class, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the fund’s portfolio holdings, may negatively impact the fund’s performance, and may exacerbate other risks to which the fund is subject.
Common stock risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Common stock risk: Common stock represents an ownership interest in a company. The value of a company’s stock may fall or fail to rise as a result of factors directly relating to that company, such as decisions made by its management or lower demand for the company’s products or services. A stock’s value may also fall because of factors affecting not just the company, but also other companies in the same industry or in a number of different industries, such as increases in production costs. Companies whose stocks the Investment Manager believes are undervalued by the market may have experienced adverse business developments or may be subject to special risks that have caused their stocks to be out of favor.
Growth stocks may be more susceptible to earnings disappointments, and the market may not favor growth-style investing.
Small and midsize companies risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Small and midsize companies risk: Stocks of small and midsize companies often trade in smaller volumes, and their prices may fluctuate more than stocks of larger companies. Stocks of these companies may therefore be more vulnerable to adverse developments than those of larger companies.
Industry or sector concentration risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Industry or sector concentration risk: From time to time, the fund may invest a significant portion of its assets in companies in one or more related industries or sectors, which would make the fund more vulnerable to adverse developments affecting those industries or sectors.
Sustainable investing risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Sustainable investing risk: Investing with a focus on Solutions Companies, whose products and services may provide solutions that directly impact sustainable environmental, social and economic development, may result in the fund investing in certain types of companies, industries or sectors that the market may not favor. In evaluating an investment opportunity, the Investment Manager may make investment decisions without the availability of optimal ESG-related data or based on information and data that is incomplete or inaccurate. Sustainability and ESG factors are not uniformly defined and applying such factors involves subjective assessments. Sustainability and ESG scorings and assessments of issuers can vary across third-party data providers and may change over time. The Investment Manager does not rely exclusively on third party data providers in evaluating ESG criteria. ESG information from third party providers may be incomplete, inaccurate or unavailable. In addition,
a solutions company’s business practices, products or services may change over time. As a result of these possibilities, among others, the fund may temporarily hold securities that are inconsistent with the Investment Manager’s sustainable investment criteria. Regulatory changes or interpretations regarding the definitions and/or use of ESG or other sustainability criteria could have a material adverse effect on the fund’s ability to invest in accordance with its investment policies and/or achieve its investment objective, as well as the ability of certain classes of investors to invest in funds, such as the fund, whose strategies include ESG or other sustainability criteria.
Management and operational risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Management and operational risk: There is no guarantee that the investment techniques, analyses, or judgments that the Investment Manager applies in making investment decisions for the fund will produce the intended outcome or that the investments selected for the fund will perform as well as other securities that were not selected for the fund. The Investment Manager, or the fund’s other service providers, may experience disruptions or operating errors that could negatively impact the fund.
Tracking Basket structure risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Tracking Basket structure risk: The fund’s Tracking Basket structure may affect the price at which shares of the fund trade in the secondary market. Although the Tracking Basket is intended to provide investors with enough information to allow for an effective arbitrage mechanism that will keep the market price of the fund at or close to its net asset value per share, there is a risk that market prices will vary significantly from net asset value. ETFs trading on the basis of a published Tracking Basket, may trade at a wider bid/ask spread than ETFs that publish their portfolios on a daily basis, and therefore, may cost investors more to trade. These risks may increase during periods of market disruption or volatility. In addition, although the fund seeks to benefit from keeping its portfolio information secret, market participants may attempt to use the Tracking Basket to identify the fund’s trading strategy. If successful, this could result in such market participants engaging in certain predatory trading practices that may have the potential to harm the fund and its shareholders, such as front running the fund’s trades of portfolio securities.
Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block]
It is important to understand that you can lose money by investing in the fund.
Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.