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    <rr:RiskReturnHeading contextRef="S000081802EIE-PRO">Fund Summary
Fund:
Fidelity&#xae; Enhanced International ETF
</rr:RiskReturnHeading>
    <rr:ObjectiveHeading contextRef="S000081802EIE-PRO">Investment Objective</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock contextRef="S000081802EIE-PRO">Fidelity&#xae; Enhanced International ETF seeks capital appreciation.</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading contextRef="S000081802EIE-PRO">Fee Table</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock contextRef="S000081802EIE-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="S000081802EIE-PRO">Shareholder fees</rr:ShareholderFeesCaption>
    <rr:ShareholderFeeOther contextRef="S000081802EIE-PRO" decimals="0" unitRef="usd">0</rr:ShareholderFeeOther>
    <rr:OperatingExpensesCaption contextRef="S000081802EIE-PRO">Annual Operating Expenses</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="S000081802C000244833"
      decimals="6"
      unitRef="pure">0.0028</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000081802C000244833"
      decimals="6"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
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      decimals="6"
      id="footnoteS000081802EIE-PROAOE_AC000244833_OE"
      unitRef="pure">0.0000</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000081802C000244833"
      decimals="6"
      unitRef="pure">0.0028</rr:ExpensesOverAssets>
    <rr:OtherExpensesNewFundBasedOnEstimates contextRef="S000081802EIE-PRO">Based on estimated amounts for the current fiscal year.</rr:OtherExpensesNewFundBasedOnEstimates>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="S000081802EIE-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="S000081802C000244833"
      decimals="0"
      unitRef="usd">29</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000081802C000244833"
      decimals="0"
      unitRef="usd">90</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000081802C000244833"
      decimals="0"
      unitRef="usd">157</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000081802C000244833"
      decimals="0"
      unitRef="usd">356</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading contextRef="S000081802EIE-PRO">Portfolio Turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock contextRef="S000081802EIE-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 of the predecessor fund (as defined below), the predecessor fund's portfolio turnover rate was 114% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate contextRef="S000081802EIE-PRO" decimals="4" unitRef="pure">1.14</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading contextRef="S000081802EIE-PRO">Principal Investment Strategies</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock contextRef="S000081802EIE-PRO">
Normally investing at least 80% of assets in common stocks included in the MSCI EAFE Index, which is a market capitalization-weighted index that is designed to measure the investable equity market performance for global investors in developed markets, excluding the U.S. &amp; Canada.Generally using computer-aided, quantitative analysis of historical valuation, growth, profitability, and other factors to select a broadly diversified group of stocks that may have the potential to provide a higher total return than that of the MSCI EAFE Index.Lending securities to earn income for the fund.
</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading contextRef="S000081802EIE-PRO">Principal Investment Risks</rr:RiskHeading>
    <rr:RiskNarrativeTextBlock contextRef="S000081802EIE-PRO">
Stock Market Volatility.
Stock markets 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.
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.
Foreign exchange rates also can be extremely volatile.
Geographic Exposure to Japan.
Because the fund invests a meaningful portion of its assets in Japan, the fund's performance is expected to be closely tied to social, political, and economic conditions within Japan and to be more volatile than the performance of more geographically diversified funds.
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.
Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty.
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.
Authorized Participant Concentration Risk.
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 NAV and possibly face trading halts and/or de-listing.
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.
Securities Lending Risk.
Securities lending involves the risk that the borrower may fail to return the securities loaned in a timely manner or at all. If the borrower defaults on its obligation to return the securities loaned because of insolvency or other reasons, a fund could experience delays and costs in recovering the securities loaned or in gaining access to the collateral.
High Portfolio Turnover.
High portfolio turnover (more than 100%) may result in increased transaction costs and potentially higher capital gains or losses. The effects of higher than normal portfolio turnover may adversely affect the fund's performance.
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="S000081802EIE-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="S000081802EIE-PRO">&#160;You could lose money by investing in the fund.</rr:RiskLoseMoney>
    <rr:BarChartAndPerformanceTableHeading contextRef="S000081802EIE-PRO">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock contextRef="S000081802EIE-PRO">
It is currently contemplated that, effective November 17, 2023, Fidelity&#xae; International Enhanced Index Fund ("Predecessor Fund") will be reorganized into the fund ("Reorganization"). Accordingly, the information shown below is for the Predecessor Fund.&#160;The Predecessor Fund's investment objective was identical to the fund's and the Predecessor Fund was managed in a manner that, in all material respects, complied with the investment guidelines and restrictions of the fund. The Predecessor Fund was designated as the accounting survivor in the Reorganization. As a result, the fund has assumed the Predecessor Fund's historical performance and the performance information shown below reflects that of the Predecessor Fund.
The following information is intended to help you understand the risks of investing in the fund.&#160;
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. The index has characteristics relevant to the fund's investment strategies. Index descriptions appear 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="S000081802EIE-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. </rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="S000081802EIE-PRO">Past performance (before and after taxes) is not an indication of future performance.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformanceAvailabilityWebSiteAddress contextRef="S000081802EIE-PRO"> www.fidelity.com </rr:PerformanceAvailabilityWebSiteAddress>
    <rr:BarChartHeading contextRef="S000081802EIE-PRO">Year-by-Year Returns </rr:BarChartHeading>
    <rr:AnnualReturn2013
      contextRef="S000081802C000244833"
      decimals="INF"
      unitRef="pure">0.2301</rr:AnnualReturn2013>
    <rr:AnnualReturn2014
      contextRef="S000081802C000244833"
      decimals="INF"
      unitRef="pure">-0.0371</rr:AnnualReturn2014>
    <rr:AnnualReturn2015
      contextRef="S000081802C000244833"
      decimals="INF"
      unitRef="pure">0.0149</rr:AnnualReturn2015>
    <rr:AnnualReturn2016
      contextRef="S000081802C000244833"
      decimals="INF"
      unitRef="pure">0.0189</rr:AnnualReturn2016>
    <rr:AnnualReturn2017
      contextRef="S000081802C000244833"
      decimals="INF"
      unitRef="pure">0.2759</rr:AnnualReturn2017>
    <rr:AnnualReturn2018
      contextRef="S000081802C000244833"
      decimals="INF"
      unitRef="pure">-0.1472</rr:AnnualReturn2018>
    <rr:AnnualReturn2019
      contextRef="S000081802C000244833"
      decimals="INF"
      unitRef="pure">0.1827</rr:AnnualReturn2019>
    <rr:AnnualReturn2020
      contextRef="S000081802C000244833"
      decimals="INF"
      unitRef="pure">0.0766</rr:AnnualReturn2020>
    <rr:AnnualReturn2021
      contextRef="S000081802C000244833"
      decimals="INF"
      unitRef="pure">0.1147</rr:AnnualReturn2021>
    <rr:AnnualReturn2022
      contextRef="S000081802C000244833"
      decimals="INF"
      unitRef="pure">-0.1398</rr:AnnualReturn2022>
    <rr:HighestQuarterlyReturnLabel contextRef="S000081802EIE-PRO"> &#160;&#160;&#160;Highest Quarter Return</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturn contextRef="S000081802EIE-PRO" decimals="4" unitRef="pure">0.1715</rr:BarChartHighestQuarterlyReturn>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="S000081802EIE-PRO">2022-12-31</rr:BarChartHighestQuarterlyReturnDate>
    <rr:LowestQuarterlyReturnLabel contextRef="S000081802EIE-PRO"> &#160;&#160;&#160;Lowest Quarter Return</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturn contextRef="S000081802EIE-PRO" decimals="4" unitRef="pure">-0.2278</rr:BarChartLowestQuarterlyReturn>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="S000081802EIE-PRO">2020-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:YearToDateReturnLabel contextRef="S000081802EIE-PRO"> &#160;&#160;&#160;Year-to-Date Return</rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturn contextRef="S000081802EIE-PRO" decimals="4" unitRef="pure">0.1250</rr:BarChartYearToDateReturn>
    <rr:BarChartYearToDateReturnDate contextRef="S000081802EIE-PRO">2023-06-30</rr:BarChartYearToDateReturnDate>
    <rr:PerformanceTableHeading contextRef="S000081802EIE-PRO">Average Annual Returns</rr:PerformanceTableHeading>
    <rr:PerformanceTableNarrativeTextBlock contextRef="S000081802EIE-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="S000081802EIE-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="S000081802EIE-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="S000081802EIE-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="S000081802C000244833ReturnBeforeTaxes">Return Before Taxes</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000081802C000244833ReturnBeforeTaxes"
      decimals="4"
      unitRef="pure">-0.1398</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000081802C000244833ReturnBeforeTaxes"
      decimals="4"
      unitRef="pure">0.0081</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000081802C000244833ReturnBeforeTaxes"
      decimals="4"
      unitRef="pure">0.0499</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000081802C000244833AfterTaxesOnDistributions">Return After Taxes on Distributions</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000081802C000244833AfterTaxesOnDistributions"
      decimals="4"
      unitRef="pure">-0.1434</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000081802C000244833AfterTaxesOnDistributions"
      decimals="4"
      unitRef="pure">0.0040</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000081802C000244833AfterTaxesOnDistributions"
      decimals="4"
      unitRef="pure">0.0458</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000081802C000244833AfterTaxesOnDistributionsAndSales">Return After Taxes on Distributions and Sale of Fund Shares</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000081802C000244833AfterTaxesOnDistributionsAndSales"
      decimals="4"
      unitRef="pure">-0.0781</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000081802C000244833AfterTaxesOnDistributionsAndSales"
      decimals="4"
      unitRef="pure">0.0078</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000081802C000244833AfterTaxesOnDistributionsAndSales"
      decimals="4"
      unitRef="pure">0.0409</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000081802IndexMS001EIE-PRO">MSCI EAFE Index</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000081802IndexMS001EIE-PRO"
      decimals="4"
      unitRef="pure">-0.1427</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000081802IndexMS001EIE-PRO"
      decimals="4"
      unitRef="pure">0.0175</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000081802IndexMS001EIE-PRO"
      decimals="4"
      unitRef="pure">0.0487</rr:AverageAnnualReturnYear10>
    <rr:RiskReturnHeading contextRef="S000081804EIE-PRO">Fund Summary
Fund:
Fidelity&#xae; Enhanced Large Cap Core ETF
</rr:RiskReturnHeading>
    <rr:ObjectiveHeading contextRef="S000081804EIE-PRO">Investment Objective</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock contextRef="S000081804EIE-PRO">Fidelity&#xae; Enhanced Large Cap Core ETF seeks capital appreciation.</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading contextRef="S000081804EIE-PRO">Fee Table</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock contextRef="S000081804EIE-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="S000081804EIE-PRO">Shareholder fees</rr:ShareholderFeesCaption>
    <rr:ShareholderFeeOther contextRef="S000081804EIE-PRO" decimals="0" unitRef="usd">0</rr:ShareholderFeeOther>
    <rr:OperatingExpensesCaption contextRef="S000081804EIE-PRO">Annual Operating Expenses</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="S000081804C000244835"
      decimals="6"
      unitRef="pure">0.0018</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000081804C000244835"
      decimals="6"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000081804C000244835"
      decimals="6"
      id="footnoteS000081804EIE-PROAOE_AC000244835_OE"
      unitRef="pure">0.0000</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000081804C000244835"
      decimals="6"
      unitRef="pure">0.0018</rr:ExpensesOverAssets>
    <rr:OtherExpensesNewFundBasedOnEstimates contextRef="S000081804EIE-PRO">Based on estimated amounts for the current fiscal year.</rr:OtherExpensesNewFundBasedOnEstimates>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="S000081804EIE-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="S000081804C000244835"
      decimals="0"
      unitRef="usd">18</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000081804C000244835"
      decimals="0"
      unitRef="usd">58</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000081804C000244835"
      decimals="0"
      unitRef="usd">101</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000081804C000244835"
      decimals="0"
      unitRef="usd">230</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading contextRef="S000081804EIE-PRO">Portfolio Turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock contextRef="S000081804EIE-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 of the predecessor fund (as defined below), the predecessor fund's portfolio turnover rate was 104% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate contextRef="S000081804EIE-PRO" decimals="4" unitRef="pure">1.04</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading contextRef="S000081804EIE-PRO">Principal Investment Strategies</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock contextRef="S000081804EIE-PRO">
Normally investing at least 80% of assets in common stocks included in the S&amp;P 500&#xae; Index, which is a market capitalization-weighted index of 500 common stocks chosen for market size, liquidity, and industry group representation to represent U.S. equity performance.Generally using computer-aided, quantitative analysis of historical valuation, growth, profitability, and other factors to select a broadly diversified group of stocks that may have the potential to provide a higher total return than that of the S&amp;P 500&#xae;&#160;Index.Investing in domestic and foreign issuers.Lending securities to earn income for the fund.
</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading contextRef="S000081804EIE-PRO">Principal Investment Risks</rr:RiskHeading>
    <rr:RiskNarrativeTextBlock contextRef="S000081804EIE-PRO">
Stock Market Volatility.
Stock markets 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.
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.
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.
Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty.
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.
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.
Authorized Participant Concentration Risk.
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 NAV and possibly face trading halts and/or de-listing.
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.
Securities Lending Risk.
Securities lending involves the risk that the borrower may fail to return the securities loaned in a timely manner or at all. If the borrower defaults on its obligation to return the securities loaned because of insolvency or other reasons, a fund could experience delays and costs in recovering the securities loaned or in gaining access to the collateral.
High Portfolio Turnover.
High portfolio turnover (more than 100%) may result in increased transaction costs and potentially higher capital gains or losses. The effects of higher than normal portfolio turnover may adversely affect the fund's performance.
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="S000081804EIE-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="S000081804EIE-PRO">&#160;You could lose money by investing in the fund.</rr:RiskLoseMoney>
    <rr:BarChartAndPerformanceTableHeading contextRef="S000081804EIE-PRO">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock contextRef="S000081804EIE-PRO">
It is currently contemplated that, effective November 17, 2023, Fidelity&#xae; Large Cap Core Enhanced Index Fund ("Predecessor Fund") will be reorganized into the fund ("Reorganization"). Accordingly, the information shown below is for the Predecessor Fund.&#160;The Predecessor Fund's investment objective was identical to the fund's and the Predecessor Fund was managed in a manner that, in all material respects, complied with the investment guidelines and restrictions of the fund. The Predecessor Fund was designated as the accounting survivor in the Reorganization. As a result, the fund has assumed the Predecessor Fund's historical performance and the performance information shown below reflects that of the Predecessor Fund.
The following information is intended to help you understand the risks of investing in the fund.&#160;
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. The index has characteristics relevant to the fund's investment strategies. Index descriptions appear 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="S000081804EIE-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. </rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="S000081804EIE-PRO">Past performance (before and after taxes) is not an indication of future performance.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformanceAvailabilityWebSiteAddress contextRef="S000081804EIE-PRO"> www.fidelity.com </rr:PerformanceAvailabilityWebSiteAddress>
    <rr:BarChartHeading contextRef="S000081804EIE-PRO">Year-by-Year Returns </rr:BarChartHeading>
    <rr:AnnualReturn2013
      contextRef="S000081804C000244835"
      decimals="INF"
      unitRef="pure">0.3429</rr:AnnualReturn2013>
    <rr:AnnualReturn2014
      contextRef="S000081804C000244835"
      decimals="INF"
      unitRef="pure">0.1352</rr:AnnualReturn2014>
    <rr:AnnualReturn2015
      contextRef="S000081804C000244835"
      decimals="INF"
      unitRef="pure">-0.0054</rr:AnnualReturn2015>
    <rr:AnnualReturn2016
      contextRef="S000081804C000244835"
      decimals="INF"
      unitRef="pure">0.1086</rr:AnnualReturn2016>
    <rr:AnnualReturn2017
      contextRef="S000081804C000244835"
      decimals="INF"
      unitRef="pure">0.2165</rr:AnnualReturn2017>
    <rr:AnnualReturn2018
      contextRef="S000081804C000244835"
      decimals="INF"
      unitRef="pure">-0.0335</rr:AnnualReturn2018>
    <rr:AnnualReturn2019
      contextRef="S000081804C000244835"
      decimals="INF"
      unitRef="pure">0.2766</rr:AnnualReturn2019>
    <rr:AnnualReturn2020
      contextRef="S000081804C000244835"
      decimals="INF"
      unitRef="pure">0.1805</rr:AnnualReturn2020>
    <rr:AnnualReturn2021
      contextRef="S000081804C000244835"
      decimals="INF"
      unitRef="pure">0.3036</rr:AnnualReturn2021>
    <rr:AnnualReturn2022
      contextRef="S000081804C000244835"
      decimals="INF"
      unitRef="pure">-0.1620</rr:AnnualReturn2022>
    <rr:HighestQuarterlyReturnLabel contextRef="S000081804EIE-PRO"> &#160;&#160;&#160;Highest Quarter Return</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturn contextRef="S000081804EIE-PRO" decimals="4" unitRef="pure">0.1939</rr:BarChartHighestQuarterlyReturn>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="S000081804EIE-PRO">2020-06-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:LowestQuarterlyReturnLabel contextRef="S000081804EIE-PRO"> &#160;&#160;&#160;Lowest Quarter Return</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturn contextRef="S000081804EIE-PRO" decimals="4" unitRef="pure">-0.1853</rr:BarChartLowestQuarterlyReturn>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="S000081804EIE-PRO">2020-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:YearToDateReturnLabel contextRef="S000081804EIE-PRO"> &#160;&#160;&#160;Year-to-Date Return</rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturn contextRef="S000081804EIE-PRO" decimals="4" unitRef="pure">0.1590</rr:BarChartYearToDateReturn>
    <rr:BarChartYearToDateReturnDate contextRef="S000081804EIE-PRO">2023-06-30</rr:BarChartYearToDateReturnDate>
    <rr:PerformanceTableHeading contextRef="S000081804EIE-PRO">Average Annual Returns</rr:PerformanceTableHeading>
    <rr:PerformanceTableNarrativeTextBlock contextRef="S000081804EIE-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="S000081804EIE-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="S000081804EIE-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="S000081804EIE-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="S000081804C000244835ReturnBeforeTaxes">Return Before Taxes</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000081804C000244835ReturnBeforeTaxes"
      decimals="4"
      unitRef="pure">-0.1620</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000081804C000244835ReturnBeforeTaxes"
      decimals="4"
      unitRef="pure">0.0973</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000081804C000244835ReturnBeforeTaxes"
      decimals="4"
      unitRef="pure">0.1252</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000081804C000244835AfterTaxesOnDistributions">Return After Taxes on Distributions</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000081804C000244835AfterTaxesOnDistributions"
      decimals="4"
      unitRef="pure">-0.1645</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000081804C000244835AfterTaxesOnDistributions"
      decimals="4"
      unitRef="pure">0.0819</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000081804C000244835AfterTaxesOnDistributions"
      decimals="4"
      unitRef="pure">0.1066</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000081804C000244835AfterTaxesOnDistributionsAndSales">Return After Taxes on Distributions and Sale of Fund Shares</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000081804C000244835AfterTaxesOnDistributionsAndSales"
      decimals="4"
      unitRef="pure">-0.0941</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000081804C000244835AfterTaxesOnDistributionsAndSales"
      decimals="4"
      unitRef="pure">0.0745</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000081804C000244835AfterTaxesOnDistributionsAndSales"
      decimals="4"
      unitRef="pure">0.0973</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000081804IndexSP001EIE-PRO">S&amp;P 500&#xae; Index</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000081804IndexSP001EIE-PRO"
      decimals="4"
      unitRef="pure">-0.1811</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000081804IndexSP001EIE-PRO"
      decimals="4"
      unitRef="pure">0.0942</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000081804IndexSP001EIE-PRO"
      decimals="4"
      unitRef="pure">0.1256</rr:AverageAnnualReturnYear10>
    <rr:RiskReturnHeading contextRef="S000081805EIE-PRO">Fund Summary
Fund:
Fidelity&#xae; Enhanced Large Cap Growth ETF
</rr:RiskReturnHeading>
    <rr:ObjectiveHeading contextRef="S000081805EIE-PRO">Investment Objective</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock contextRef="S000081805EIE-PRO">Fidelity&#xae; Enhanced Large Cap Growth ETF seeks capital appreciation.</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading contextRef="S000081805EIE-PRO">Fee Table</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock contextRef="S000081805EIE-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="S000081805EIE-PRO">Shareholder fees</rr:ShareholderFeesCaption>
    <rr:ShareholderFeeOther contextRef="S000081805EIE-PRO" decimals="0" unitRef="usd">0</rr:ShareholderFeeOther>
    <rr:OperatingExpensesCaption contextRef="S000081805EIE-PRO">Annual Operating Expenses</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="S000081805C000244836"
      decimals="6"
      unitRef="pure">0.0018</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000081805C000244836"
      decimals="6"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000081805C000244836"
      decimals="6"
      id="footnoteS000081805EIE-PROAOE_AC000244836_OE"
      unitRef="pure">0.0000</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000081805C000244836"
      decimals="6"
      unitRef="pure">0.0018</rr:ExpensesOverAssets>
    <rr:OtherExpensesNewFundBasedOnEstimates contextRef="S000081805EIE-PRO">Based on estimated amounts for the current fiscal year.</rr:OtherExpensesNewFundBasedOnEstimates>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="S000081805EIE-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="S000081805C000244836"
      decimals="0"
      unitRef="usd">18</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000081805C000244836"
      decimals="0"
      unitRef="usd">58</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000081805C000244836"
      decimals="0"
      unitRef="usd">101</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000081805C000244836"
      decimals="0"
      unitRef="usd">230</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading contextRef="S000081805EIE-PRO">Portfolio Turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock contextRef="S000081805EIE-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 of the predecessor fund (as defined below), the predecessor fund's portfolio turnover rate was 101% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate contextRef="S000081805EIE-PRO" decimals="4" unitRef="pure">1.01</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading contextRef="S000081805EIE-PRO">Principal Investment Strategies</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock contextRef="S000081805EIE-PRO">
Normally investing at least 80% of assets in common stocks included in the Russell 1000&#xae; Growth Index, which is a market capitalization-weighted index designed to measure the performance of the large-cap growth segment of the U.S. equity market.Generally using computer-aided, quantitative analysis of historical valuation, growth, profitability, and other factors to select a broadly diversified group of stocks that may have the potential to provide a higher total return than that of the Russell 1000&#xae; Growth Index.Investing in domestic and foreign issuers.Lending securities to earn income for the fund.
</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading contextRef="S000081805EIE-PRO">Principal Investment Risks</rr:RiskHeading>
    <rr:RiskNarrativeTextBlock contextRef="S000081805EIE-PRO">
Stock Market Volatility.
Stock markets 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.
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.
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.
Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty.
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.
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.
Authorized Participant Concentration Risk.
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 NAV and possibly face trading halts and/or de-listing.
"Growth" Investing.
 "Growth" stocks can perform differently from the market as a whole and other types of stocks and can be more volatile than other types of stocks.&#160; &#160; &#160;
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.
Securities Lending Risk.
Securities lending involves the risk that the borrower may fail to return the securities loaned in a timely manner or at all. If the borrower defaults on its obligation to return the securities loaned because of insolvency or other reasons, a fund could experience delays and costs in recovering the securities loaned or in gaining access to the collateral.
High Portfolio Turnover.
High portfolio turnover (more than 100%) may result in increased transaction costs and potentially higher capital gains or losses. The effects of higher than normal portfolio turnover may adversely affect the fund's performance.
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="S000081805EIE-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="S000081805EIE-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="S000081805EIE-PRO">&#160;You could lose money by investing in the fund.</rr:RiskLoseMoney>
    <rr:BarChartAndPerformanceTableHeading contextRef="S000081805EIE-PRO">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock contextRef="S000081805EIE-PRO">
It is currently contemplated that, effective November 17, 2023, Fidelity&#xae; Large Cap Growth Enhanced Index Fund ("Predecessor Fund") will be reorganized into the fund ("Reorganization"). Accordingly, the information shown below is for the Predecessor Fund.&#160;The Predecessor Fund's investment objective was identical to the fund's and the Predecessor Fund was managed in a manner that, in all material respects, complied with the investment guidelines and restrictions of the fund. The Predecessor Fund was designated as the accounting survivor in the Reorganization. As a result, the fund has assumed the Predecessor Fund's historical performance and the performance information shown below reflects that of the Predecessor Fund.
The following information is intended to help you understand the risks of investing in the fund.&#160;
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. The index has characteristics relevant to the fund's investment strategies. Index descriptions appear 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="S000081805EIE-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. </rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="S000081805EIE-PRO">Past performance (before and after taxes) is not an indication of future performance.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformanceAvailabilityWebSiteAddress contextRef="S000081805EIE-PRO"> www.fidelity.com </rr:PerformanceAvailabilityWebSiteAddress>
    <rr:BarChartHeading contextRef="S000081805EIE-PRO">Year-by-Year Returns </rr:BarChartHeading>
    <rr:AnnualReturn2013
      contextRef="S000081805C000244836"
      decimals="INF"
      unitRef="pure">0.3507</rr:AnnualReturn2013>
    <rr:AnnualReturn2014
      contextRef="S000081805C000244836"
      decimals="INF"
      unitRef="pure">0.1388</rr:AnnualReturn2014>
    <rr:AnnualReturn2015
      contextRef="S000081805C000244836"
      decimals="INF"
      unitRef="pure">0.0329</rr:AnnualReturn2015>
    <rr:AnnualReturn2016
      contextRef="S000081805C000244836"
      decimals="INF"
      unitRef="pure">0.0821</rr:AnnualReturn2016>
    <rr:AnnualReturn2017
      contextRef="S000081805C000244836"
      decimals="INF"
      unitRef="pure">0.2714</rr:AnnualReturn2017>
    <rr:AnnualReturn2018
      contextRef="S000081805C000244836"
      decimals="INF"
      unitRef="pure">-0.0377</rr:AnnualReturn2018>
    <rr:AnnualReturn2019
      contextRef="S000081805C000244836"
      decimals="INF"
      unitRef="pure">0.3145</rr:AnnualReturn2019>
    <rr:AnnualReturn2020
      contextRef="S000081805C000244836"
      decimals="INF"
      unitRef="pure">0.3598</rr:AnnualReturn2020>
    <rr:AnnualReturn2021
      contextRef="S000081805C000244836"
      decimals="INF"
      unitRef="pure">0.2932</rr:AnnualReturn2021>
    <rr:AnnualReturn2022
      contextRef="S000081805C000244836"
      decimals="INF"
      unitRef="pure">-0.2657</rr:AnnualReturn2022>
    <rr:HighestQuarterlyReturnLabel contextRef="S000081805EIE-PRO"> &#160;&#160;&#160;Highest Quarter Return</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturn contextRef="S000081805EIE-PRO" decimals="4" unitRef="pure">0.2621</rr:BarChartHighestQuarterlyReturn>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="S000081805EIE-PRO">2020-06-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:LowestQuarterlyReturnLabel contextRef="S000081805EIE-PRO"> &#160;&#160;&#160;Lowest Quarter Return</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturn contextRef="S000081805EIE-PRO" decimals="4" unitRef="pure">-0.1959</rr:BarChartLowestQuarterlyReturn>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="S000081805EIE-PRO">2022-06-30</rr:BarChartLowestQuarterlyReturnDate>
    <rr:YearToDateReturnLabel contextRef="S000081805EIE-PRO"> &#160;&#160;&#160;Year-to-Date Return</rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturn contextRef="S000081805EIE-PRO" decimals="4" unitRef="pure">0.2636</rr:BarChartYearToDateReturn>
    <rr:BarChartYearToDateReturnDate contextRef="S000081805EIE-PRO">2023-06-30</rr:BarChartYearToDateReturnDate>
    <rr:PerformanceTableHeading contextRef="S000081805EIE-PRO">Average Annual Returns</rr:PerformanceTableHeading>
    <rr:PerformanceTableNarrativeTextBlock contextRef="S000081805EIE-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="S000081805EIE-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="S000081805EIE-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="S000081805EIE-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="S000081805C000244836ReturnBeforeTaxes">Return Before Taxes</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000081805C000244836ReturnBeforeTaxes"
      decimals="4"
      unitRef="pure">-0.2657</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000081805C000244836ReturnBeforeTaxes"
      decimals="4"
      unitRef="pure">0.1031</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000081805C000244836ReturnBeforeTaxes"
      decimals="4"
      unitRef="pure">0.1357</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000081805C000244836AfterTaxesOnDistributions">Return After Taxes on Distributions</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000081805C000244836AfterTaxesOnDistributions"
      decimals="4"
      unitRef="pure">-0.2668</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000081805C000244836AfterTaxesOnDistributions"
      decimals="4"
      unitRef="pure">0.0863</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000081805C000244836AfterTaxesOnDistributions"
      decimals="4"
      unitRef="pure">0.1200</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000081805C000244836AfterTaxesOnDistributionsAndSales">Return After Taxes on Distributions and Sale of Fund Shares</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000081805C000244836AfterTaxesOnDistributionsAndSales"
      decimals="4"
      unitRef="pure">-0.1566</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000081805C000244836AfterTaxesOnDistributionsAndSales"
      decimals="4"
      unitRef="pure">0.0803</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000081805C000244836AfterTaxesOnDistributionsAndSales"
      decimals="4"
      unitRef="pure">0.1098</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000081805IndexRS004EIE-PRO">Russell 1000 Growth Index</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000081805IndexRS004EIE-PRO"
      decimals="4"
      unitRef="pure">-0.2914</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000081805IndexRS004EIE-PRO"
      decimals="4"
      unitRef="pure">0.1096</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000081805IndexRS004EIE-PRO"
      decimals="4"
      unitRef="pure">0.1410</rr:AverageAnnualReturnYear10>
    <rr:RiskReturnHeading contextRef="S000081806EIE-PRO">Fund Summary
Fund:
Fidelity&#xae; Enhanced Large Cap Value ETF
</rr:RiskReturnHeading>
    <rr:ObjectiveHeading contextRef="S000081806EIE-PRO">Investment Objective</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock contextRef="S000081806EIE-PRO">Fidelity&#xae; Enhanced Large Cap Value ETF seeks capital appreciation.</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading contextRef="S000081806EIE-PRO">Fee Table</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock contextRef="S000081806EIE-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="S000081806EIE-PRO">Shareholder fees</rr:ShareholderFeesCaption>
    <rr:ShareholderFeeOther contextRef="S000081806EIE-PRO" decimals="0" unitRef="usd">0</rr:ShareholderFeeOther>
    <rr:OperatingExpensesCaption contextRef="S000081806EIE-PRO">Annual Operating Expenses</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="S000081806C000244837"
      decimals="6"
      unitRef="pure">0.0018</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000081806C000244837"
      decimals="6"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000081806C000244837"
      decimals="6"
      id="footnoteS000081806EIE-PROAOE_AC000244837_OE"
      unitRef="pure">0.0000</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000081806C000244837"
      decimals="6"
      unitRef="pure">0.0018</rr:ExpensesOverAssets>
    <rr:OtherExpensesNewFundBasedOnEstimates contextRef="S000081806EIE-PRO">Based on estimated amounts for the current fiscal year.</rr:OtherExpensesNewFundBasedOnEstimates>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="S000081806EIE-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="S000081806C000244837"
      decimals="0"
      unitRef="usd">18</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000081806C000244837"
      decimals="0"
      unitRef="usd">58</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000081806C000244837"
      decimals="0"
      unitRef="usd">101</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000081806C000244837"
      decimals="0"
      unitRef="usd">230</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading contextRef="S000081806EIE-PRO">Portfolio Turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock contextRef="S000081806EIE-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 of the predecessor fund (as defined below), the predecessor fund's portfolio turnover rate was 112% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate contextRef="S000081806EIE-PRO" decimals="4" unitRef="pure">1.12</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading contextRef="S000081806EIE-PRO">Principal Investment Strategies</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock contextRef="S000081806EIE-PRO">
Normally investing at least 80% of assets in common stocks included in the Russell 1000&#xae; Value Index, which is a market capitalization-weighted index designed to measure the performance of the large-cap value segment of the U.S. equity market.Generally using computer-aided, quantitative analysis of historical valuation, growth, profitability, and other factors to select a broadly diversified group of stocks that may have the potential to provide a higher total return than that of the Russell 1000&#xae; Value Index.Investing in domestic and foreign issuers.Lending securities to earn income for the fund.
</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading contextRef="S000081806EIE-PRO">Principal Investment Risks</rr:RiskHeading>
    <rr:RiskNarrativeTextBlock contextRef="S000081806EIE-PRO">
Stock Market Volatility.
Stock markets 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.
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.
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.
Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty.
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.
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.
Authorized Participant Concentration Risk.
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 NAV and possibly face trading halts and/or de-listing.
"Value" Investing.
"Value" stocks can perform differently from the market as a whole and other types of stocks and can continue to be undervalued by the market for long periods of time.
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.
Securities Lending Risk.
Securities lending involves the risk that the borrower may fail to return the securities loaned in a timely manner or at all. If the borrower defaults on its obligation to return the securities loaned because of insolvency or other reasons, a fund could experience delays and costs in recovering the securities loaned or in gaining access to the collateral.
High Portfolio Turnover.
High portfolio turnover (more than 100%) may result in increased transaction costs and potentially higher capital gains or losses. The effects of higher than normal portfolio turnover may adversely affect the fund's performance.
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="S000081806EIE-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="S000081806EIE-PRO">&#160;You could lose money by investing in the fund.</rr:RiskLoseMoney>
    <rr:BarChartAndPerformanceTableHeading contextRef="S000081806EIE-PRO">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock contextRef="S000081806EIE-PRO">
It is currently contemplated that, effective November 17, 2023, Fidelity&#xae; Large Cap Value Enhanced Index Fund ("Predecessor Fund") will be reorganized into the fund ("Reorganization"). Accordingly, the information shown below is for the Predecessor Fund.&#160;The Predecessor Fund's investment objective was identical to the fund's and the Predecessor Fund was managed in a manner that, in all material respects, complied with the investment guidelines and restrictions of the fund. The Predecessor Fund was designated as the accounting survivor in the Reorganization. As a result, the fund has assumed the Predecessor Fund's historical performance and the performance information shown below reflects that of the Predecessor Fund.
The following information is intended to help you understand the risks of investing in the fund.&#160;
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. The index has characteristics relevant to the fund's investment strategies. Index descriptions appear 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="S000081806EIE-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. </rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="S000081806EIE-PRO">Past performance (before and after taxes) is not an indication of future performance.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformanceAvailabilityWebSiteAddress contextRef="S000081806EIE-PRO"> www.fidelity.com </rr:PerformanceAvailabilityWebSiteAddress>
    <rr:BarChartHeading contextRef="S000081806EIE-PRO">Year-by-Year Returns </rr:BarChartHeading>
    <rr:AnnualReturn2013
      contextRef="S000081806C000244837"
      decimals="INF"
      unitRef="pure">0.3366</rr:AnnualReturn2013>
    <rr:AnnualReturn2014
      contextRef="S000081806C000244837"
      decimals="INF"
      unitRef="pure">0.1450</rr:AnnualReturn2014>
    <rr:AnnualReturn2015
      contextRef="S000081806C000244837"
      decimals="INF"
      unitRef="pure">-0.0350</rr:AnnualReturn2015>
    <rr:AnnualReturn2016
      contextRef="S000081806C000244837"
      decimals="INF"
      unitRef="pure">0.1632</rr:AnnualReturn2016>
    <rr:AnnualReturn2017
      contextRef="S000081806C000244837"
      decimals="INF"
      unitRef="pure">0.1588</rr:AnnualReturn2017>
    <rr:AnnualReturn2018
      contextRef="S000081806C000244837"
      decimals="INF"
      unitRef="pure">-0.0753</rr:AnnualReturn2018>
    <rr:AnnualReturn2019
      contextRef="S000081806C000244837"
      decimals="INF"
      unitRef="pure">0.2416</rr:AnnualReturn2019>
    <rr:AnnualReturn2020
      contextRef="S000081806C000244837"
      decimals="INF"
      unitRef="pure">0.0443</rr:AnnualReturn2020>
    <rr:AnnualReturn2021
      contextRef="S000081806C000244837"
      decimals="INF"
      unitRef="pure">0.2830</rr:AnnualReturn2021>
    <rr:AnnualReturn2022
      contextRef="S000081806C000244837"
      decimals="INF"
      unitRef="pure">-0.0647</rr:AnnualReturn2022>
    <rr:HighestQuarterlyReturnLabel contextRef="S000081806EIE-PRO"> &#160;&#160;&#160;Highest Quarter Return</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturn contextRef="S000081806EIE-PRO" decimals="4" unitRef="pure">0.1670</rr:BarChartHighestQuarterlyReturn>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="S000081806EIE-PRO">2020-12-31</rr:BarChartHighestQuarterlyReturnDate>
    <rr:LowestQuarterlyReturnLabel contextRef="S000081806EIE-PRO"> &#160;&#160;&#160;Lowest Quarter Return</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturn contextRef="S000081806EIE-PRO" decimals="4" unitRef="pure">-0.2569</rr:BarChartLowestQuarterlyReturn>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="S000081806EIE-PRO">2020-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:YearToDateReturnLabel contextRef="S000081806EIE-PRO"> &#160;&#160;&#160;Year-to-Date Return</rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturn contextRef="S000081806EIE-PRO" decimals="4" unitRef="pure">0.0426</rr:BarChartYearToDateReturn>
    <rr:BarChartYearToDateReturnDate contextRef="S000081806EIE-PRO">2023-06-30</rr:BarChartYearToDateReturnDate>
    <rr:PerformanceTableHeading contextRef="S000081806EIE-PRO">Average Annual Returns</rr:PerformanceTableHeading>
    <rr:PerformanceTableNarrativeTextBlock contextRef="S000081806EIE-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="S000081806EIE-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="S000081806EIE-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="S000081806EIE-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="S000081806C000244837ReturnBeforeTaxes">Return Before Taxes</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000081806C000244837ReturnBeforeTaxes"
      decimals="4"
      unitRef="pure">-0.0647</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000081806C000244837ReturnBeforeTaxes"
      decimals="4"
      unitRef="pure">0.0755</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000081806C000244837ReturnBeforeTaxes"
      decimals="4"
      unitRef="pure">0.1110</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000081806C000244837AfterTaxesOnDistributions">Return After Taxes on Distributions</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000081806C000244837AfterTaxesOnDistributions"
      decimals="4"
      unitRef="pure">-0.0745</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000081806C000244837AfterTaxesOnDistributions"
      decimals="4"
      unitRef="pure">0.0601</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000081806C000244837AfterTaxesOnDistributions"
      decimals="4"
      unitRef="pure">0.0969</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000081806C000244837AfterTaxesOnDistributionsAndSales">Return After Taxes on Distributions and Sale of Fund Shares</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000081806C000244837AfterTaxesOnDistributionsAndSales"
      decimals="4"
      unitRef="pure">-0.0312</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000081806C000244837AfterTaxesOnDistributionsAndSales"
      decimals="4"
      unitRef="pure">0.0569</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000081806C000244837AfterTaxesOnDistributionsAndSales"
      decimals="4"
      unitRef="pure">0.0881</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000081806IndexRS005EIE-PRO">Russell 1000&#xae; Value Index</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000081806IndexRS005EIE-PRO"
      decimals="4"
      unitRef="pure">-0.0754</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000081806IndexRS005EIE-PRO"
      decimals="4"
      unitRef="pure">0.0667</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000081806IndexRS005EIE-PRO"
      decimals="4"
      unitRef="pure">0.1029</rr:AverageAnnualReturnYear10>
    <rr:RiskReturnHeading contextRef="S000081803EIE-PRO">Fund Summary
Fund:
Fidelity&#xae; Enhanced Mid Cap ETF
</rr:RiskReturnHeading>
    <rr:ObjectiveHeading contextRef="S000081803EIE-PRO">Investment Objective</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock contextRef="S000081803EIE-PRO">Fidelity&#xae; Enhanced Mid Cap ETF seeks capital appreciation.</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading contextRef="S000081803EIE-PRO">Fee Table</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock contextRef="S000081803EIE-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="S000081803EIE-PRO">Shareholder fees</rr:ShareholderFeesCaption>
    <rr:ShareholderFeeOther contextRef="S000081803EIE-PRO" decimals="0" unitRef="usd">0</rr:ShareholderFeeOther>
    <rr:OperatingExpensesCaption contextRef="S000081803EIE-PRO">Annual Operating Expenses</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="S000081803C000244834"
      decimals="6"
      unitRef="pure">0.0023</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000081803C000244834"
      decimals="6"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000081803C000244834"
      decimals="6"
      id="footnoteS000081803EIE-PROAOE_AC000244834_OE"
      unitRef="pure">0.0000</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000081803C000244834"
      decimals="6"
      unitRef="pure">0.0023</rr:ExpensesOverAssets>
    <rr:OtherExpensesNewFundBasedOnEstimates contextRef="S000081803EIE-PRO">Based on estimated amounts for the current fiscal year.</rr:OtherExpensesNewFundBasedOnEstimates>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="S000081803EIE-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="S000081803C000244834"
      decimals="0"
      unitRef="usd">24</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000081803C000244834"
      decimals="0"
      unitRef="usd">74</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000081803C000244834"
      decimals="0"
      unitRef="usd">130</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000081803C000244834"
      decimals="0"
      unitRef="usd">293</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading contextRef="S000081803EIE-PRO">Portfolio Turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock contextRef="S000081803EIE-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 of the predecessor fund (as defined below), the predecessor fund's portfolio turnover rate was 116% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate contextRef="S000081803EIE-PRO" decimals="4" unitRef="pure">1.16</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading contextRef="S000081803EIE-PRO">Principal Investment Strategies</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock contextRef="S000081803EIE-PRO">
Normally investing at least 80% of assets in common stocks included in the Russell Midcap&#xae; Index, which is a market capitalization-weighted index designed to measure the performance of the mid-cap segment of the U.S. equity market.&#160; &#160; &#160;Generally using computer-aided, quantitative analysis of historical valuation, growth, profitability, and other factors to select a broadly diversified group of stocks that may have the potential to provide a higher total return than that of the Russell Midcap&#xae; Index.Investing in domestic and foreign issuers.Lending securities to earn income for the fund.
</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading contextRef="S000081803EIE-PRO">Principal Investment Risks</rr:RiskHeading>
    <rr:RiskNarrativeTextBlock contextRef="S000081803EIE-PRO">
Stock Market Volatility.
Stock markets 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.
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.
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.
Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty.
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.
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.
Authorized Participant Concentration Risk.
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 NAV and possibly face trading halts and/or de-listing.
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.
Mid Cap Investing.
The value of securities of medium size, less well-known issuers can perform differently from the market as a whole and other types of stocks and can be more volatile than that of larger issuers.
Securities Lending Risk.
Securities lending involves the risk that the borrower may fail to return the securities loaned in a timely manner or at all. If the borrower defaults on its obligation to return the securities loaned because of insolvency or other reasons, a fund could experience delays and costs in recovering the securities loaned or in gaining access to the collateral.
High Portfolio Turnover.
High portfolio turnover (more than 100%) may result in increased transaction costs and potentially higher capital gains or losses. The effects of higher than normal portfolio turnover may adversely affect the fund's performance.
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="S000081803EIE-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="S000081803EIE-PRO">&#160;You could lose money by investing in the fund.</rr:RiskLoseMoney>
    <rr:BarChartAndPerformanceTableHeading contextRef="S000081803EIE-PRO">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock contextRef="S000081803EIE-PRO">
It is currently contemplated that, effective November 17, 2023, Fidelity&#xae; Mid Cap Enhanced Index Fund ("Predecessor Fund") will be reorganized into the fund ("Reorganization"). Accordingly, the information shown below is for the Predecessor Fund.&#160;The Predecessor Fund's investment objective was identical to the fund's and the Predecessor Fund was managed in a manner that, in all material respects, complied with the investment guidelines and restrictions of the fund. The Predecessor Fund was designated as the accounting survivor in the Reorganization. As a result, the fund has assumed the Predecessor Fund's historical performance and the performance information shown below reflects that of the Predecessor Fund.
The following information is intended to help you understand the risks of investing in the fund.&#160;
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. The index has characteristics relevant to the fund's investment strategies. Index descriptions appear 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="S000081803EIE-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. </rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="S000081803EIE-PRO">Past performance (before and after taxes) is not an indication of future performance.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformanceAvailabilityWebSiteAddress contextRef="S000081803EIE-PRO"> www.fidelity.com </rr:PerformanceAvailabilityWebSiteAddress>
    <rr:BarChartHeading contextRef="S000081803EIE-PRO">Year-by-Year Returns </rr:BarChartHeading>
    <rr:AnnualReturn2013
      contextRef="S000081803C000244834"
      decimals="INF"
      unitRef="pure">0.3988</rr:AnnualReturn2013>
    <rr:AnnualReturn2014
      contextRef="S000081803C000244834"
      decimals="INF"
      unitRef="pure">0.1308</rr:AnnualReturn2014>
    <rr:AnnualReturn2015
      contextRef="S000081803C000244834"
      decimals="INF"
      unitRef="pure">-0.0242</rr:AnnualReturn2015>
    <rr:AnnualReturn2016
      contextRef="S000081803C000244834"
      decimals="INF"
      unitRef="pure">0.1349</rr:AnnualReturn2016>
    <rr:AnnualReturn2017
      contextRef="S000081803C000244834"
      decimals="INF"
      unitRef="pure">0.1840</rr:AnnualReturn2017>
    <rr:AnnualReturn2018
      contextRef="S000081803C000244834"
      decimals="INF"
      unitRef="pure">-0.1172</rr:AnnualReturn2018>
    <rr:AnnualReturn2019
      contextRef="S000081803C000244834"
      decimals="INF"
      unitRef="pure">0.2735</rr:AnnualReturn2019>
    <rr:AnnualReturn2020
      contextRef="S000081803C000244834"
      decimals="INF"
      unitRef="pure">0.1537</rr:AnnualReturn2020>
    <rr:AnnualReturn2021
      contextRef="S000081803C000244834"
      decimals="INF"
      unitRef="pure">0.2412</rr:AnnualReturn2021>
    <rr:AnnualReturn2022
      contextRef="S000081803C000244834"
      decimals="INF"
      unitRef="pure">-0.1421</rr:AnnualReturn2022>
    <rr:HighestQuarterlyReturnLabel contextRef="S000081803EIE-PRO"> &#160;&#160;&#160;Highest Quarter Return</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturn contextRef="S000081803EIE-PRO" decimals="4" unitRef="pure">0.2431</rr:BarChartHighestQuarterlyReturn>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="S000081803EIE-PRO">2020-06-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:LowestQuarterlyReturnLabel contextRef="S000081803EIE-PRO"> &#160;&#160;&#160;Lowest Quarter Return</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturn contextRef="S000081803EIE-PRO" decimals="4" unitRef="pure">-0.2729</rr:BarChartLowestQuarterlyReturn>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="S000081803EIE-PRO">2020-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:YearToDateReturnLabel contextRef="S000081803EIE-PRO"> &#160;&#160;&#160;Year-to-Date Return</rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturn contextRef="S000081803EIE-PRO" decimals="4" unitRef="pure">0.0783</rr:BarChartYearToDateReturn>
    <rr:BarChartYearToDateReturnDate contextRef="S000081803EIE-PRO">2023-06-30</rr:BarChartYearToDateReturnDate>
    <rr:PerformanceTableHeading contextRef="S000081803EIE-PRO">Average Annual Returns</rr:PerformanceTableHeading>
    <rr:PerformanceTableNarrativeTextBlock contextRef="S000081803EIE-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="S000081803EIE-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="S000081803EIE-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="S000081803EIE-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="S000081803C000244834ReturnBeforeTaxes">Return Before Taxes</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000081803C000244834ReturnBeforeTaxes"
      decimals="4"
      unitRef="pure">-0.1421</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000081803C000244834ReturnBeforeTaxes"
      decimals="4"
      unitRef="pure">0.0667</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000081803C000244834ReturnBeforeTaxes"
      decimals="4"
      unitRef="pure">0.1110</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000081803C000244834AfterTaxesOnDistributions">Return After Taxes on Distributions</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000081803C000244834AfterTaxesOnDistributions"
      decimals="4"
      unitRef="pure">-0.1488</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000081803C000244834AfterTaxesOnDistributions"
      decimals="4"
      unitRef="pure">0.0498</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000081803C000244834AfterTaxesOnDistributions"
      decimals="4"
      unitRef="pure">0.0936</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000081803C000244834AfterTaxesOnDistributionsAndSales">Return After Taxes on Distributions and Sale of Fund Shares</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000081803C000244834AfterTaxesOnDistributionsAndSales"
      decimals="4"
      unitRef="pure">-0.0793</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000081803C000244834AfterTaxesOnDistributionsAndSales"
      decimals="4"
      unitRef="pure">0.0507</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000081803C000244834AfterTaxesOnDistributionsAndSales"
      decimals="4"
      unitRef="pure">0.0874</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000081803IndexRS006EIE-PRO">Russell Midcap&#xae; Index</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000081803IndexRS006EIE-PRO"
      decimals="4"
      unitRef="pure">-0.1732</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000081803IndexRS006EIE-PRO"
      decimals="4"
      unitRef="pure">0.0710</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000081803IndexRS006EIE-PRO"
      decimals="4"
      unitRef="pure">0.1096</rr:AverageAnnualReturnYear10>
    <rr:RiskReturnHeading contextRef="S000081807CPE-PRO">Fund Summary
Fund:
Fidelity&#xae; Enhanced Small Cap ETF
</rr:RiskReturnHeading>
    <rr:ObjectiveHeading contextRef="S000081807CPE-PRO">Investment Objective</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock contextRef="S000081807CPE-PRO">Fidelity&#xae; Enhanced Small Cap ETF seeks capital appreciation.</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading contextRef="S000081807CPE-PRO">Fee Table</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock contextRef="S000081807CPE-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="S000081807CPE-PRO">Shareholder fees</rr:ShareholderFeesCaption>
    <rr:ShareholderFeeOther contextRef="S000081807CPE-PRO" decimals="0" unitRef="usd">0</rr:ShareholderFeeOther>
    <rr:OperatingExpensesCaption contextRef="S000081807CPE-PRO">Annual Operating Expenses</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="S000081807C000244838"
      decimals="6"
      unitRef="pure">0.0028</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000081807C000244838"
      decimals="6"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000081807C000244838"
      decimals="6"
      id="footnoteS000081807CPE-PROAOE_AC000244838_OE"
      unitRef="pure">0.0000</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000081807C000244838"
      decimals="6"
      unitRef="pure">0.0028</rr:ExpensesOverAssets>
    <rr:OtherExpensesNewFundBasedOnEstimates contextRef="S000081807CPE-PRO">Based on estimated amounts for the current fiscal year.</rr:OtherExpensesNewFundBasedOnEstimates>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="S000081807CPE-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="S000081807C000244838"
      decimals="0"
      unitRef="usd">29</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000081807C000244838"
      decimals="0"
      unitRef="usd">90</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000081807C000244838"
      decimals="0"
      unitRef="usd">157</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000081807C000244838"
      decimals="0"
      unitRef="usd">356</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading contextRef="S000081807CPE-PRO">Portfolio Turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock contextRef="S000081807CPE-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 of the predecessor fund (as defined below), the predecessor fund's portfolio turnover rate was 98% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate contextRef="S000081807CPE-PRO" decimals="4" unitRef="pure">0.98</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading contextRef="S000081807CPE-PRO">Principal Investment Strategies</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock contextRef="S000081807CPE-PRO">
Normally investing at least 80% of assets in common stocks included in the Russell 2000&#xae; Index, which is a market capitalization-weighted index designed to measure the performance of the small-cap segment of the U.S. equity market.Generally using computer-aided, quantitative analysis of historical valuation, growth, profitability, and other factors to select a broadly diversified group of stocks that may have the potential to provide a higher total return than that of the Russell 2000&#xae; Index.Investing in domestic and foreign issuers.Lending securities to earn income for the fund.
</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading contextRef="S000081807CPE-PRO">Principal Investment Risks</rr:RiskHeading>
    <rr:RiskNarrativeTextBlock contextRef="S000081807CPE-PRO">
Stock Market Volatility.
Stock markets 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.
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.
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.
Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty.
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.
Authorized Participant Concentration Risk.
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 NAV and possibly face trading halts and/or de-listing.
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.
Small Cap Investing.
The value of securities of smaller, less well-known issuers can perform differently from the market as a whole and other types of stocks and can be more volatile than that of larger issuers.
Securities Lending Risk.
Securities lending involves the risk that the borrower may fail to return the securities loaned in a timely manner or at all. If the borrower defaults on its obligation to return the securities loaned because of insolvency or other reasons, a fund could experience delays and costs in recovering the securities loaned or in gaining access to the collateral.
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="S000081807CPE-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="S000081807CPE-PRO">&#160;You could lose money by investing in the fund.</rr:RiskLoseMoney>
    <rr:BarChartAndPerformanceTableHeading contextRef="S000081807CPE-PRO">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock contextRef="S000081807CPE-PRO">
It is currently contemplated that, effective November 17, 2023, Fidelity&#xae; Small Cap Enhanced Index Fund ("Predecessor Fund") will be reorganized into the fund ("Reorganization"). Accordingly, the information shown below is for the Predecessor Fund.&#160;The Predecessor Fund's investment objective was identical to the fund's and the Predecessor Fund was managed in a manner that, in all material respects, complied with the investment guidelines and restrictions of the fund. The Predecessor Fund was designated as the accounting survivor in the Reorganization. As a result, the fund has assumed the Predecessor Fund's historical performance and the performance information shown below reflects that of the Predecessor Fund.
The following information is intended to help you understand the risks of investing in the fund.&#160;
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. The index has characteristics relevant to the fund's investment strategies. Index descriptions appear 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="S000081807CPE-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. </rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="S000081807CPE-PRO">Past performance (before and after taxes) is not an indication of future performance.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformanceAvailabilityWebSiteAddress contextRef="S000081807CPE-PRO"> www.fidelity.com </rr:PerformanceAvailabilityWebSiteAddress>
    <rr:BarChartHeading contextRef="S000081807CPE-PRO">Year-by-Year Returns </rr:BarChartHeading>
    <rr:AnnualReturn2013
      contextRef="S000081807C000244838"
      decimals="INF"
      unitRef="pure">0.3866</rr:AnnualReturn2013>
    <rr:AnnualReturn2014
      contextRef="S000081807C000244838"
      decimals="INF"
      unitRef="pure">0.0550</rr:AnnualReturn2014>
    <rr:AnnualReturn2015
      contextRef="S000081807C000244838"
      decimals="INF"
      unitRef="pure">-0.0188</rr:AnnualReturn2015>
    <rr:AnnualReturn2016
      contextRef="S000081807C000244838"
      decimals="INF"
      unitRef="pure">0.2284</rr:AnnualReturn2016>
    <rr:AnnualReturn2017
      contextRef="S000081807C000244838"
      decimals="INF"
      unitRef="pure">0.0722</rr:AnnualReturn2017>
    <rr:AnnualReturn2018
      contextRef="S000081807C000244838"
      decimals="INF"
      unitRef="pure">-0.1304</rr:AnnualReturn2018>
    <rr:AnnualReturn2019
      contextRef="S000081807C000244838"
      decimals="INF"
      unitRef="pure">0.2365</rr:AnnualReturn2019>
    <rr:AnnualReturn2020
      contextRef="S000081807C000244838"
      decimals="INF"
      unitRef="pure">0.1853</rr:AnnualReturn2020>
    <rr:AnnualReturn2021
      contextRef="S000081807C000244838"
      decimals="INF"
      unitRef="pure">0.2054</rr:AnnualReturn2021>
    <rr:AnnualReturn2022
      contextRef="S000081807C000244838"
      decimals="INF"
      unitRef="pure">-0.1828</rr:AnnualReturn2022>
    <rr:HighestQuarterlyReturnLabel contextRef="S000081807CPE-PRO"> &#160;&#160;&#160;Highest Quarter Return</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturn contextRef="S000081807CPE-PRO" decimals="4" unitRef="pure">0.3184</rr:BarChartHighestQuarterlyReturn>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="S000081807CPE-PRO">2020-12-31</rr:BarChartHighestQuarterlyReturnDate>
    <rr:LowestQuarterlyReturnLabel contextRef="S000081807CPE-PRO"> &#160;&#160;&#160;Lowest Quarter Return</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturn contextRef="S000081807CPE-PRO" decimals="4" unitRef="pure">-0.3145</rr:BarChartLowestQuarterlyReturn>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="S000081807CPE-PRO">2020-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:YearToDateReturnLabel contextRef="S000081807CPE-PRO"> &#160;&#160;&#160;Year-to-Date Return</rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturn contextRef="S000081807CPE-PRO" decimals="4" unitRef="pure">0.1025</rr:BarChartYearToDateReturn>
    <rr:BarChartYearToDateReturnDate contextRef="S000081807CPE-PRO">2023-06-30</rr:BarChartYearToDateReturnDate>
    <rr:PerformanceTableHeading contextRef="S000081807CPE-PRO">Average Annual Returns</rr:PerformanceTableHeading>
    <rr:PerformanceTableNarrativeTextBlock contextRef="S000081807CPE-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="S000081807CPE-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="S000081807CPE-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="S000081807CPE-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="S000081807C000244838ReturnBeforeTaxes">Return Before Taxes</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
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      decimals="4"
      unitRef="pure">-0.1828</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
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      decimals="4"
      unitRef="pure">0.0466</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
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      decimals="4"
      unitRef="pure">0.0903</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000081807C000244838AfterTaxesOnDistributions">Return After Taxes on Distributions</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
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      decimals="4"
      unitRef="pure">-0.1918</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
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      decimals="4"
      unitRef="pure">0.0277</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
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      decimals="4"
      unitRef="pure">0.0726</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000081807C000244838AfterTaxesOnDistributionsAndSales">Return After Taxes on Distributions and Sale of Fund Shares</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000081807C000244838AfterTaxesOnDistributionsAndSales"
      decimals="4"
      unitRef="pure">-0.1010</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000081807C000244838AfterTaxesOnDistributionsAndSales"
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      unitRef="pure">0.0360</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000081807C000244838AfterTaxesOnDistributionsAndSales"
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    <rr:AverageAnnualReturnLabel contextRef="S000081807IndexRS002CPE-PRO">Russell 2000 Index</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
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    <rr:AverageAnnualReturnYear05
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      unitRef="pure">0.0413</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000081807IndexRS002CPE-PRO"
      decimals="4"
      unitRef="pure">0.0901</rr:AverageAnnualReturnYear10>
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