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    <rr:RiskReturnHeading contextRef="S000075296_NF0831FidelitySustainableHighYieldETFPro01Member">         Fund Summary
                  Fund:
         Fidelity&#xae; Sustainable High Yield ETF

</rr:RiskReturnHeading>
    <rr:ObjectiveHeading contextRef="S000075296_NF0831FidelitySustainableHighYieldETFPro01Member">         Investment Objective

</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock contextRef="S000075296_NF0831FidelitySustainableHighYieldETFPro01Member">         The fund seeks a high level of income. The fund may also seek capital appreciation.

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    <rr:ExpenseHeading contextRef="S000075296_NF0831FidelitySustainableHighYieldETFPro01Member">         Fee Table

</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock contextRef="S000075296_NF0831FidelitySustainableHighYieldETFPro01Member">         The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected
            in the table or example below.


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    <rr:ShareholderFeesCaption contextRef="S000075296_NF0831FidelitySustainableHighYieldETFPro01Member">         Shareholder fees

</rr:ShareholderFeesCaption>
    <rr:ShareholderFeeOther
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    <rr:OperatingExpensesCaption contextRef="S000075296_NF0831FidelitySustainableHighYieldETFPro01Member">                  Annual Operating Expenses
                  (expenses that you pay each year as a % of the value of your investment)

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    <rr:ManagementFeesOverAssets
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    <rr:OtherExpensesNewFundBasedOnEstimates contextRef="S000075296_NF0831FidelitySustainableHighYieldETFPro01Member">Based on estimated amounts for the current fiscal year.</rr:OtherExpensesNewFundBasedOnEstimates>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="S000075296_NF0831FidelitySustainableHighYieldETFPro01Member">                  This example helps compare the cost of investing in the fund with the cost of investing in other funds.

                  Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual
            operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses
            or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end
            of each time period indicated:


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      contextRef="S000075296_C000234213_NF0831FidelitySustainableHighYieldETFPro01Member"
      decimals="0"
      unitRef="usd">176</rr:ExpenseExampleYear03>
    <rr:PortfolioTurnoverHeading contextRef="S000075296_NF0831FidelitySustainableHighYieldETFPro01Member">         Portfolio Turnover

</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock contextRef="S000075296_NF0831FidelitySustainableHighYieldETFPro01Member">         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 operating expenses or in the example, affect the fund's performance.


</rr:PortfolioTurnoverTextBlock>
    <rr:StrategyHeading contextRef="S000075296_NF0831FidelitySustainableHighYieldETFPro01Member">         Principal Investment Strategies

</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock contextRef="S000075296_NF0831FidelitySustainableHighYieldETFPro01Member">
            Normally investing at least 80% of the fund&#x92;s assets in debt securities rated below investment grade (also referred to
               as high yield debt securities or junk bonds) of issuers that Fidelity Management &amp; Research Company LLC (FMR or Adviser) believes
               have proven or improving sustainability practices based on an evaluation of such issuers' individual environmental, social
               and governance (ESG) profile.



            Using the Adviser's proprietary ESG ratings process to evaluate the current state of an issuer&#x92;s sustainability practices
               using a data-driven framework that includes both proprietary and third-party data, and also provide a qualitative forward
               looking assessment of an issuer&#x92;s sustainability outlook provided by the Adviser&#x92;s fundamental research analysts
               and ESG team.



            The Adviser's ESG ratings of issuers are derived from multiple factors, including an issuer&#x92;s environmental profile,
               which may include, but is not limited to, carbon and toxic emissions, water management, waste management, vulnerability to
               the physical impacts of climate change, and research and investment into products, services, and energies that reduce emissions
               and/or provide opportunities to achieve a low carbon transition. An assessment of an issuer&#x92;s social profile includes,
               but is not limited to, its approach to diversity and inclusion, human capital management, data privacy, product safety and
               human rights. With respect to governance, the independence and diversity of an issuer&#x92;s board, its compensation practices
               and board oversight of critical ESG issues are considered as part of the assessment. These factors are weighted based on how
               material the Adviser believes each factor is to an issuer&#x92;s financial outlook, and not all factors may be applicable
               to all issuers.



            Investing in issuers that FMR believes deliver tangible environmental or social impact through core business operations. An
               assessment of the impact characteristics of an issuer may involve corporate engagement and an analysis of issuer alignment
               with the United Nations Sustainable Development Goals using qualitative analysis as well as proprietary or third-party data.
               For example, issuers that provide access to clean water, education, or clean energy through their core business may be considered
               to deliver tangible impact.



            Using the ICE&#xae; BofA&#xae; US High Yield Constrained Index as a guide in structuring the fund and selecting its investments as it relates to credit
               quality distribution and risk characteristics.



            Potentially investing in securities that have a higher credit quality than securities in the index.


            Investing in companies in troubled or uncertain financial condition.


            Investing in domestic and foreign issuers.


            In addition to the ESG ratings process, using a proprietary multifactor quantitative model and fundamental analysis to screen
               over 1,000 bonds.  The multifactor quantitative model uses a value and quality factor-based methodology to identify bonds
               with strong return potential and low probability of default. FMR also uses fundamental analysis of factors such as each issuer&#x92;s
               financial condition and industry position, as well as economic and market conditions, to select investments.



            Employing sustainable investing exclusion criteria to avoid investments in issuers that are directly engaged in, and/or derive
               significant revenue from, certain industries.  Please see &#x93;Fund Basics &#x96; Investment Details &#x96; Sustainable Investing
               Exclusions&#x94; for additional information.



</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading contextRef="S000075296_NF0831FidelitySustainableHighYieldETFPro01Member">         Principal Investment Risks

</rr:RiskHeading>
    <rr:RiskNarrativeTextBlock contextRef="S000075296_NF0831FidelitySustainableHighYieldETFPro01Member">
            Interest Rate Changes.&#160;Interest rate increases can cause the price of a debt security to decrease.



            Sustainability Risk.&#160;Application of FMR's ESG ratings process and/or its sustainable investing exclusion criteria may affect the fund&#x92;s exposure
               to certain issuers, sectors, regions, and countries and may affect the fund&#x92;s performance depending on whether certain
               investments are in or out of favor. The criteria related to the fund&#x92;s ESG ratings process and/or adherence to its sustainable
               investing exclusion criteria may result in the fund forgoing opportunities to buy certain securities when it might otherwise
               be advantageous to do so, or selling securities for ESG reasons when it might be otherwise disadvantageous for it to do so.
               As a result, the fund&#x92;s performance may at times be better or worse than the performance of funds that do not use ESG
               or sustainability criteria. There are significant differences in interpretations of what it means for an issuer to have positive
               ESG factors. While the Adviser believes its definitions are reasonable, the portfolio decisions it makes may differ with other
               investors&#x92; or advisers&#x92; views.



            Foreign Exposure.&#160;Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse
               issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.



            Issuer-Specific Changes.&#160;The value of an individual security or particular type of security can be more volatile than, and can perform differently
               from, the market as a whole. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities
               or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the
               credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity
               to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell.



            Fluctuation of Net Asset Value and Share Price.&#160;The net asset value per share (NAV) 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) to NAV. Given the nature of the relevant markets for certain of the fund's securities, shares may trade at a larger premium or discount
               to the NAV than shares of other ETFs. In addition, in stressed market conditions or periods of market disruption or volatility, the market for shares may become
               less liquid in response to deteriorating liquidity in the markets for the fund&#x92;s underlying portfolio holdings.



            Trading Issues.&#160;There can be no assurance that an active trading market will be maintained. Market makers and Authorized Participants are
               not obligated to make a market in the fund&#x92;s shares or to submit purchase and redemption orders for creation units. In
               addition, trading may be halted, for example, due to market conditions.



            Cash Transactions Risk.&#160;Unlike certain ETFs, the fund may effect some or all creations and redemptions using cash, rather than in-kind securities.
               As a result, an investment in the fund may be less tax-efficient than an investment in an ETF that distributes portfolio securities
               entirely in-kind.



            Quantitative Investing.&#160;Securities selected using quantitative analysis can perform differently from the market as a whole as a result of the factors
               used in the analysis, the weight placed on each factor, and changes in the factors' historical trends.


                  An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation
               or any other government agency.  You could lose money by investing in the fund.


</rr:RiskNarrativeTextBlock>
    <rr:RiskNotInsuredDepositoryInstitution contextRef="S000075296_NF0831FidelitySustainableHighYieldETFPro01Member">An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation
               or any other government agency.</rr:RiskNotInsuredDepositoryInstitution>
    <rr:RiskLoseMoney contextRef="S000075296_NF0831FidelitySustainableHighYieldETFPro01Member">You could lose money by investing in the fund.</rr:RiskLoseMoney>
    <rr:BarChartAndPerformanceTableHeading contextRef="S000075296_NF0831FidelitySustainableHighYieldETFPro01Member">         Performance

</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceOneYearOrLess contextRef="S000075296_NF0831FidelitySustainableHighYieldETFPro01Member">Performance history will be available for the fund after the fund has been in operation for one calendar year.</rr:PerformanceOneYearOrLess>
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