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  Fund Summary

   Fund:



    Fidelity&#xae; Sustainable High Yield ETF



 </rr:RiskReturnHeading>
    <rr:ObjectiveHeading contextRef="S000075296SHY-PRO">
  Investment Objective
 </rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock contextRef="S000075296SHY-PRO">
  Fidelity&#xae; Sustainable High Yield ETF seeks a high level of income. The fund may also seek capital appreciation.
 </rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading contextRef="S000075296SHY-PRO">
  Fee Table
 </rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock contextRef="S000075296SHY-PRO">

   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.


 </rr:ExpenseNarrativeTextBlock>
    <rr:ShareholderFeesCaption contextRef="S000075296SHY-PRO">
  Shareholder fees
 </rr:ShareholderFeesCaption>
    <rr:ShareholderFeeOther contextRef="S000075296SHY-PRO" decimals="0" unitRef="usd">0</rr:ShareholderFeeOther>
    <rr:OperatingExpensesCaption contextRef="S000075296SHY-PRO">
  Annual Operating Expenses
 </rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="S000075296C000234213"
      decimals="6"
      unitRef="pure">0.0055</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000075296C000234213"
      decimals="6"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000075296C000234213"
      decimals="6"
      unitRef="pure">0.0000</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000075296C000234213"
      decimals="6"
      unitRef="pure">0.0055</rr:ExpensesOverAssets>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="S000075296SHY-PRO">
  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 the 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:
 </rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="S000075296C000234213"
      decimals="0"
      unitRef="usd">56</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000075296C000234213"
      decimals="0"
      unitRef="usd">176</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000075296C000234213"
      decimals="0"
      unitRef="usd">307</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000075296C000234213"
      decimals="0"
      unitRef="usd">689</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading contextRef="S000075296SHY-PRO">
   Portfolio Turnover
  </rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock contextRef="S000075296SHY-PRO">
   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. For the period from February 15, 2022 to August 31, 2022, the fund's portfolio turnover rate was

     24

   % of the average value of its portfolio.
  </rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate contextRef="S000075296SHY-PRO" decimals="4" unitRef="pure">0.24</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading contextRef="S000075296SHY-PRO">
   Principal Investment Strategies
  </rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock contextRef="S000075296SHY-PRO">

     Normally investing at least 80% of the fund'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'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's sustainability outlook provided by the Adviser's fundamental research analysts and ESG team.
     The Adviser's ESG ratings of issuers are derived from multiple factors, including an issuer'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 transition to less carbon-intensive products or operations. An assessment of an issuer'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'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'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'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 "Fund Basics - Investment Details - Sustainable Investing Exclusions" for additional information.


  </rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading contextRef="S000075296SHY-PRO">
   Principal Investment Risks
  </rr:RiskHeading>
    <rr:RiskNarrativeTextBlock contextRef="S000075296SHY-PRO">

    Interest Rate Changes.


    Interest rate increases can cause the price of a debt security to decrease.


    Sustainability Risk.


    Application of FMR's ESG ratings process and/or its sustainable investing exclusion criteria may affect the fund's exposure to certain issuers, sectors, regions, and countries and may affect the fund's performance depending on whether certain investments are in or out of favor. The criteria related to the fund'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'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' or advisers' views. When evaluating an issuer, the Adviser is dependent on information or data obtained through voluntary or third-party reporting that may be incomplete, inaccurate, or unavailable, which could cause the Adviser to incorrectly assess an issuer's business practices.


    Foreign Exposure.


    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.


    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.


    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,&#160;the market for shares may become less liquid in response to deteriorating liquidity in the markets for the fund's underlying portfolio holdings.


    Trading Issues.


    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'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.


    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.


    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
     .


     &#160;
     You could lose money by investing in the fund.



  </rr:RiskNarrativeTextBlock>
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     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="S000075296SHY-PRO">
     &#160;
     You could lose money by investing in the fund.
    </rr:RiskLoseMoney>
    <rr:BarChartAndPerformanceTableHeading contextRef="S000075296SHY-PRO">
   Performance
  </rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock contextRef="S000075296SHY-PRO">


     Performance history will be available for the fund after the fund has been in operation for one calendar year.


  </rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceOneYearOrLess contextRef="S000075296SHY-PRO">
     Performance history will be available for the fund after the fund has been in operation for one calendar year.
    </rr:PerformanceOneYearOrLess>
    <rr:RiskReturnHeading contextRef="S000062078HIE-PRO">
  Fund Summary

   Fund:



    Fidelity&#xae; High Yield Factor ETF



 </rr:RiskReturnHeading>
    <rr:ObjectiveHeading contextRef="S000062078HIE-PRO">
  Investment Objective
 </rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock contextRef="S000062078HIE-PRO">
  Fidelity&#xae; High Yield Factor ETF seeks a high level of income. The fund may also seek capital appreciation.
 </rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading contextRef="S000062078HIE-PRO">
  Fee Table
 </rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock contextRef="S000062078HIE-PRO">

   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.


 </rr:ExpenseNarrativeTextBlock>
    <rr:ShareholderFeesCaption contextRef="S000062078HIE-PRO">
  Shareholder fees
 </rr:ShareholderFeesCaption>
    <rr:ShareholderFeeOther contextRef="S000062078HIE-PRO" decimals="0" unitRef="usd">0</rr:ShareholderFeeOther>
    <rr:OperatingExpensesCaption contextRef="S000062078HIE-PRO">
  Annual Operating Expenses
 </rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="S000062078C000201027"
      decimals="6"
      unitRef="pure">0.0045</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000062078C000201027"
      decimals="6"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000062078C000201027"
      decimals="6"
      unitRef="pure">0.0000</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000062078C000201027"
      decimals="6"
      unitRef="pure">0.0045</rr:ExpensesOverAssets>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="S000062078HIE-PRO">
  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 the 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:
 </rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="S000062078C000201027"
      decimals="0"
      unitRef="usd">46</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000062078C000201027"
      decimals="0"
      unitRef="usd">144</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000062078C000201027"
      decimals="0"
      unitRef="usd">252</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000062078C000201027"
      decimals="0"
      unitRef="usd">567</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading contextRef="S000062078HIE-PRO">
   Portfolio Turnover
  </rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock contextRef="S000062078HIE-PRO">
   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. During the most recent fiscal year, the fund's portfolio turnover rate was

     72

   % of the average value of its portfolio.
  </rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate contextRef="S000062078HIE-PRO" decimals="4" unitRef="pure">0.72</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading contextRef="S000062078HIE-PRO">
   Principal Investment Strategies
  </rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock contextRef="S000062078HIE-PRO">

    Normally investing at least 80% of assets in debt securities rated below investment grade (also referred to as high yield debt securities or junk bonds).
    Using the ICE&#xae; BofA&#xae; BB-B 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.
    Normally investing primarily in securities rated BB or B by Standard &amp; Poor's (S&amp;P), Ba or B by Moody's Investors Service (Moody's), comparably rated by at least one nationally recognized credit rating agency, or, if unrated, considered by Fidelity Management &amp; Research Company LLC (FMR) to be of comparable quality.
    Potentially investing in securities that have a higher or lower credit quality.
    Investing in companies in troubled or uncertain financial condition.
    Investing in domestic and foreign issuers.
    Using a proprietary multifactor quantitative model to systematically screen over 1,000 bonds and select those with strong return potential and low probability of default using a value and quality factor-based methodology.


  </rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading contextRef="S000062078HIE-PRO">
   Principal Investment Risks
  </rr:RiskHeading>
    <rr:RiskNarrativeTextBlock contextRef="S000062078HIE-PRO">

    Interest Rate Changes.


    Interest rate increases can cause the price of a debt security to decrease.


    Foreign Exposure.


    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.


    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.


    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,&#160;the market for shares may become less liquid in response to deteriorating liquidity in the markets for the fund's underlying portfolio holdings.


    Trading Issues.


    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'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.


    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.


    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
     .


     &#160;
     You could lose money by investing in the fund.



  </rr:RiskNarrativeTextBlock>
    <rr:RiskNotInsuredDepositoryInstitution contextRef="S000062078HIE-PRO">
     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="S000062078HIE-PRO">
     &#160;
     You could lose money by investing in the fund.
    </rr:RiskLoseMoney>
    <rr:BarChartAndPerformanceTableHeading contextRef="S000062078HIE-PRO">
   Performance
  </rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock contextRef="S000062078HIE-PRO">

    The following information is intended to help you understand the risks of investing in the fund.



     The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index over various periods of time.

     The index description appears in the "Additional Index Information" section of the prospectus.

      Past performance (before and after taxes) is not an indication of future performance.



    Visit

      www.fidelity.com

    for more recent performance information.


  </rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="S000062078HIE-PRO">
     The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index over various periods of time.
    </rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="S000062078HIE-PRO">
      Past performance (before and after taxes) is not an indication of future performance.
    </rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformanceAvailabilityWebSiteAddress contextRef="S000062078HIE-PRO">
      www.fidelity.com
    </rr:PerformanceAvailabilityWebSiteAddress>
    <rr:BarChartHeading contextRef="S000062078HIE-PRO">
   Year-by-Year Returns
  </rr:BarChartHeading>
    <rr:AnnualReturn2019
      contextRef="S000062078C000201027"
      decimals="INF"
      unitRef="pure">0.1754</rr:AnnualReturn2019>
    <rr:AnnualReturn2020
      contextRef="S000062078C000201027"
      decimals="INF"
      unitRef="pure">0.1064</rr:AnnualReturn2020>
    <rr:AnnualReturn2021
      contextRef="S000062078C000201027"
      decimals="INF"
      unitRef="pure">0.0469</rr:AnnualReturn2021>
    <rr:HighestQuarterlyReturnLabel contextRef="S000062078HIE-PRO">
       &#160;&#160;&#160;Highest Quarter Return
     </rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturn contextRef="S000062078HIE-PRO" decimals="4" unitRef="pure">0.1091</rr:BarChartHighestQuarterlyReturn>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="S000062078HIE-PRO">2020-06-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:LowestQuarterlyReturnLabel contextRef="S000062078HIE-PRO">
       &#160;&#160;&#160;Lowest Quarter Return
     </rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturn contextRef="S000062078HIE-PRO" decimals="4" unitRef="pure">-0.0978</rr:BarChartLowestQuarterlyReturn>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="S000062078HIE-PRO">2020-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:YearToDateReturnLabel contextRef="S000062078HIE-PRO">
       &#160;&#160;&#160;Year-to-Date Return
     </rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturn contextRef="S000062078HIE-PRO" decimals="4" unitRef="pure">-0.1572</rr:BarChartYearToDateReturn>
    <rr:BarChartYearToDateReturnDate contextRef="S000062078HIE-PRO">2022-09-30</rr:BarChartYearToDateReturnDate>
    <rr:PerformanceTableHeading contextRef="S000062078HIE-PRO">
   Average Annual Returns
  </rr:PerformanceTableHeading>
    <rr:PerformanceTableNarrativeTextBlock contextRef="S000062078HIE-PRO">

    After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

    Actual after-tax returns may differ depending on your individual circumstances.

     The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).


     Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

  </rr:PerformanceTableNarrativeTextBlock>
    <rr:PerformanceTableUsesHighestFederalRate contextRef="S000062078HIE-PRO">
    After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.
   </rr:PerformanceTableUsesHighestFederalRate>
    <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="S000062078HIE-PRO">
     The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).
   </rr:PerformanceTableNotRelevantToTaxDeferred>
    <rr:PerformanceTableExplanationAfterTaxHigher contextRef="S000062078HIE-PRO">
     Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.
   </rr:PerformanceTableExplanationAfterTaxHigher>
    <rr:AverageAnnualReturnLabel contextRef="S000062078C000201027ReturnBeforeTaxes">
      Return Before Taxes
     </rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000062078C000201027ReturnBeforeTaxes"
      decimals="4"
      unitRef="pure">0.0469</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnSinceInception
      contextRef="S000062078C000201027ReturnBeforeTaxes"
      decimals="4"
      id="footnoteHIE-PROS000062078AAR__RBT"
      unitRef="pure">0.0842</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnLabel contextRef="S000062078C000201027AfterTaxesOnDistributions">
      Return After Taxes on Distributions
     </rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000062078C000201027AfterTaxesOnDistributions"
      decimals="4"
      unitRef="pure">0.0221</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnSinceInception
      contextRef="S000062078C000201027AfterTaxesOnDistributions"
      decimals="4"
      id="footnoteHIE-PROS000062078AAR__ATD"
      unitRef="pure">0.0598</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnLabel contextRef="S000062078C000201027AfterTaxesOnDistributionsAndSales">
      Return After Taxes on Distributions and Sale of Fund Shares
     </rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000062078C000201027AfterTaxesOnDistributionsAndSales"
      decimals="4"
      unitRef="pure">0.0280</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnSinceInception
      contextRef="S000062078C000201027AfterTaxesOnDistributionsAndSales"
      decimals="4"
      id="footnoteHIE-PROS000062078AAR__ATDS"
      unitRef="pure">0.0543</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnLabel contextRef="S000062078IndexML100HIE-PRO">
      ICE&#xae; BofA&#xae; BB-B US High Yield Constrained Index
     </rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000062078IndexML100HIE-PRO"
      decimals="4"
      unitRef="pure">0.0460</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnSinceInception
      contextRef="S000062078IndexML100HIE-PRO"
      decimals="4"
      id="footnoteHIE-PROS000062078AAR_A_IndexML100"
      unitRef="pure">0.0659</rr:AverageAnnualReturnSinceInception>
    <rr:AnnualReturnInceptionDate contextRef="S000062078HIE-PRO">2018-06-12</rr:AnnualReturnInceptionDate>
    <rr:RiskReturnHeading contextRef="S000072125HIE-PRO">
   Fund Summary

    Fund:



     Fidelity&#xae; Preferred Securities &amp; Income ETF



  </rr:RiskReturnHeading>
    <rr:ObjectiveHeading contextRef="S000072125HIE-PRO">
   Investment Objective
  </rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock contextRef="S000072125HIE-PRO">
   Fidelity&#xae; Preferred Securities &amp; Income ETF seeks high total return through a combination of current income and capital appreciation.
  </rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading contextRef="S000072125HIE-PRO">
   Fee Table
  </rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock contextRef="S000072125HIE-PRO">

    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.


  </rr:ExpenseNarrativeTextBlock>
    <rr:ShareholderFeesCaption contextRef="S000072125HIE-PRO">
   Shareholder fees
  </rr:ShareholderFeesCaption>
    <rr:ShareholderFeeOther contextRef="S000072125HIE-PRO" decimals="0" unitRef="usd">0</rr:ShareholderFeeOther>
    <rr:OperatingExpensesCaption contextRef="S000072125HIE-PRO">
   Annual Operating Expenses
  </rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="S000072125C000227886"
      decimals="6"
      unitRef="pure">0.0059</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000072125C000227886"
      decimals="6"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000072125C000227886"
      decimals="6"
      unitRef="pure">0.0000</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000072125C000227886"
      decimals="6"
      unitRef="pure">0.0059</rr:ExpensesOverAssets>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="S000072125HIE-PRO">
   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 the 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:
  </rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="S000072125C000227886"
      decimals="0"
      unitRef="usd">60</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000072125C000227886"
      decimals="0"
      unitRef="usd">189</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000072125C000227886"
      decimals="0"
      unitRef="usd">329</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000072125C000227886"
      decimals="0"
      unitRef="usd">738</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading contextRef="S000072125HIE-PRO">
    Portfolio Turnover
   </rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock contextRef="S000072125HIE-PRO">
    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. During the most recent fiscal year, the fund's portfolio turnover rate was

      21

    % of the average value of its portfolio.
   </rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate contextRef="S000072125HIE-PRO" decimals="4" unitRef="pure">0.21</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading contextRef="S000072125HIE-PRO">
    Principal Investment Strategies
   </rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock contextRef="S000072125HIE-PRO">

     Normally investing at least 80% of assets in preferred securities and other income-producing securities.
     Normally investing in all types of preferred securities and other income-producing securities such as contingent convertible securities and corporate hybrid securities.
     Normally investing primarily in securities rated at least BB by Standard &amp; Poor's (S&amp;P), Ba by Moody's Investors Service (Moody's), comparably rated by at least one nationally recognized credit rating agency, or, if unrated, considered by Fidelity Management &amp; Research Company LLC (FMR) to be of comparable quality. Securities rated below BBB by S&amp;P and below Baa3 by Moody's are less than investment-grade quality (also referred to as high yield debt securities or junk bonds).
     Investing in securities of domestic and foreign issuers.
     Using fundamental analysis of each issuer's financial condition and industry position and market and economic conditions to select investments.
     Concentrating investments in securities of issuers principally engaged in the business activities of the industries in the financial services sector.


   </rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading contextRef="S000072125HIE-PRO">
    Principal Investment Risks
   </rr:RiskHeading>
    <rr:RiskNarrativeTextBlock contextRef="S000072125HIE-PRO">

     Preferred Securities.


     Because preferred securities have a lower priority claim on assets or earnings than senior debt instruments in an issuer's capital structure, they are subject to greater credit and liquidation risk than more senior debt instruments. In addition, preferred securities are subject to other risks, such as limited or no voting rights, deferring or skipping distributions, floating interest rates or distributions, interest rate risk, and the issuer having the right to redeem the security prior to any stated maturity date.


     Stock Market Volatility.


     Stock markets and, as a result, stock market indexes, are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.


     Interest Rate Changes.


     Interest rate increases can cause the price of a debt security to decrease.


     Foreign Exposure.


     Foreign 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.


     Financials Industry Concentration.


     The financials industries are subject to extensive government regulation, can be subject to relatively rapid change due to increasingly blurred distinctions between service segments, and can be significantly affected by availability and cost of capital funds, changes in interest rates, the rate of corporate and consumer debt defaults, and price competition.


     Issuer-Specific Changes.


     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.


     Fluctuation of Net Asset Value and Share Price.


     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,&#160;the market for shares may become less liquid in response to deteriorating liquidity in the markets for the fund's underlying portfolio holdings.


     Contingent Convertible Securities Risk.


     Contingent convertible securities have unique equity conversion or principal write-down features that involve additional risks, which may include cancellation of interest payments by the issuer or a regulatory authority; subordination to other creditors due to either a liquidation or other bankruptcy-related event or a conversion of the security from debt to equity; and a write-down of the security's principal amount.


     Trading Issues.


     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'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.


     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.



      In addition, the fund is classified as non-diversified under the Investment Company Act of 1940 (1940 Act), which means that it has the ability to invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.




      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
      .


      &#160;
      You could lose money by investing in the fund.



   </rr:RiskNarrativeTextBlock>
    <rr:RiskNondiversifiedStatus contextRef="S000072125HIE-PRO">
      In addition, the fund is classified as non-diversified under the Investment Company Act of 1940 (1940 Act), which means that it has the ability to invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.
     </rr:RiskNondiversifiedStatus>
    <rr:RiskNotInsuredDepositoryInstitution contextRef="S000072125HIE-PRO">
      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="S000072125HIE-PRO">
      &#160;
      You could lose money by investing in the fund.
     </rr:RiskLoseMoney>
    <rr:BarChartAndPerformanceTableHeading contextRef="S000072125HIE-PRO">
    Performance
   </rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock contextRef="S000072125HIE-PRO">


      Performance history will be available for the fund after the fund has been in operation for one calendar year.


   </rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceOneYearOrLess contextRef="S000072125HIE-PRO">
      Performance history will be available for the fund after the fund has been in operation for one calendar year.
     </rr:PerformanceOneYearOrLess>
    <link:footnoteLink
      xlink:role="http://www.xbrl.org/2003/role/link"
      xlink:type="extended">
        <link:loc
          xlink:href="#footnoteHIE-PROS000062078AAR_A_IndexML100"
          xlink:label="footnoteHIE-PROS000062078AAR_A_IndexML100"
          xlink:type="locator"/>
        <link:footnote id="footnoteHIE-PROS000062078AAR_A" xlink:label="footnoteHIE-PROS000062078AAR_A" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:span style="font-family:'Fidelity Futura Std Book',Arial,Helvetica,sans-serif;font-size:6px;color:#000000;font-style:normal;vertical-align:super;font-weight:normal;">A</xhtml:span><xhtml:span style="font-family:'Fidelity Futura Std Book',Arial,Helvetica,sans-serif;font-size:11px;color:#000000;font-style:italic;font-weight:normal;">From </xhtml:span><xhtml:span style="font-family:'Fidelity Futura Std Book',Arial,Helvetica,sans-serif;font-size:11px;color:#000000;font-style:italic;font-weight:normal;">June 12, 2018</xhtml:span></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteHIE-PROS000062078AAR_A_IndexML100"
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          xlink:type="arc"/>
    </link:footnoteLink>
</xbrl>
