Prospectus [Table] Risk/Return: Document Type Document Period End Date Registrant Name Entity Central Index Key Amendment Flag Amendment Description Trading Symbol Document Creation Date Document Effective Date Entity Investment Company Type Prospectus Date Document [Axis] Prospectus Performance Measure [Axis] Before Taxes Series [Axis] Series Class [Axis] Average Annual Return, Percent Annual Return [Percent] Share Classes Risk/Return [Heading] Objective [Heading] Objective, Primary [Text Block] Objective, Secondary [Text Block] Expense Heading [Optional Text] Expense Narrative [Text Block] Shareholder Fees Caption [Optional Text] Shareholder Fees [Table] Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses [Table] Expense Footnotes [Text Block] Expenses Deferred Charges [Text Block] Expenses Range of Exchange Fees [Text Block] Expense Example [Heading] Expense Example by Year [Heading] Expense Example Narrative [Text Block] Expense Example by, Year, Caption [Text] Expense Example, With Redemption [Table] Expense Example, No Redemption Narrative [Text Block] Expense Example, No Redemption, By Year, Caption [Text] Expense Example, No Redemption [Table] Expense Example Footnotes [Text Block] Expense Example Closing [Text Block] Portfolio Turnover [Heading] Portfolio Turnover [Text Block] Strategy [Heading] Strategy Narrative [Text Block] Risk [Text Block] Bar Chart and Performance Table [Heading] Performance Narrative [Text Block] Bar Chart Narrative [Text Block] Bar Chart [Heading] Bar Chart [Table] Bar Chart Footnotes [Text Block] Bar Chart Closing [Text Block] Performance Table Heading Performance Table Narrative Performance [Table] Market Index Performance [Table] Performance Table Footnotes Performance Table Closing [Text Block] Supplement to Prospectus [Text Block] Shareholder Fees: Shareholder Fees Column [Optional Text] Operating Expenses: Operating Expenses Column [Optional Text] Expense Example: Expense Example, By Year, Column [Optional Text] Expense Example, No Redemption: Expense Example, No Redemption, By Year, Column [Optional Text] Bar Chart Table: Annual Return Caption [Text] Annual Return, Column [Optional Text] Annual Return, Inception Date Average Annual Return: Fee Waiver or Reimbursement over Assets, Date of Termination Portfolio Turnover, Rate Expense Breakpoint Discounts [Text] Expense Breakpoint, Minimum Investment Required [Amount] Expenses Represent Both Master and Feeder [Text] Expenses Explanation of Nonrecurring Account Fee [Text] Other Expenses, New Fund, Based on Estimates [Text] Acquired Fund Fees and Expenses, Based on Estimates [Text] Expenses Other Expenses Had Extraordinary Expenses Been Included [Text] Expenses Restated to Reflect Current [Text] Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] Strategy Portfolio Concentration [Text] Risk Lose Money [Member] Risk Nondiversified Status [Member] Risk Money Market Fund Price Fluctuates [Member] Risk Money Market Fund May Impose Fees or Suspend Sales [Member] Risk Money Market Fund Sponsor May Not Provide Support [Member] Risk Money Market Fund May Not Preserve Dollar [Member] Risk Not Insured [Member] Risk Not Insured Depository Institution [Member] Performance Information Illustrates Variability of Returns [Text] Performance One Year or Less [Text] Performance Additional Market Index [Text] Performance Availability Phone [Text] Performance Availability Website Address [Text] Performance Past Does Not Indicate Future [Text] Bar Chart Does Not Reflect Sales Loads [Text] Bar Chart, Reason Selected Class Different from Immediately Preceding Period [Text] Bar Chart, Returns for Class Not Offered in Prospectus [Text] Year to Date Return, Label [Optional Text] Bar Chart, Year to Date Return, Date Bar Chart, Year to Date Return Highest Quarterly Return, Label [Optional Text] Highest Quarterly Return, Date Highest Quarterly Return Lowest Quarterly Return, Label [Optional Text] Lowest Quarterly Return, Date Lowest Quarterly Return Performance Table Does Reflect Sales Loads Performance Table Market Index Changed Index No Deduction for Fees, Expenses, or Taxes [Text] Performance Table Uses Highest Federal Rate Performance Table Not Relevant to Tax Deferred Performance Table One Class of after Tax Shown [Text] Performance Table Explanation after Tax Higher Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text] Average Annual Return, Caption [Optional Text] Average Annual Return, Column Name [Optional Text] Average Annual Return, Label [Optional Text] Money Market Seven Day Yield, Caption [Optional Text] Money Market Seven Day Yield Column [Optional Text] Money Market Seven Day Yield Phone Money Market Seven Day Yield Money Market Seven Day Tax Equivalent Yield Thirty Day Yield Caption [Optional Text] Thirty Day Yield Column [Optional Text] Thirty Day Yield Phone Thirty Day Yield Thirty Day Tax Equivalent Yield Expense Example, with Redemption, 1 Year Expense Example, with Redemption, 3 Years Expense Example, with Redemption, 5 Years Expense Example, with Redemption, 10 Years Expense Example, No Redemption, 1 Year Expense Example, No Redemption, 3 Years Expense Example, No Redemption, 5 Years Expense Example, No Redemption, 10 Years ThematicIndexETFs-ComboPRO ThematicIndexETFs-ComboPRO FidelityEnhancedETFs-ComboPro FidelityEnhancedETFs-ComboPro FidelityEnhancedHighYieldandPreferredSecuritiesIncomeETFs-ComboPRO FidelityEnhancedHighYieldandPreferredSecuritiesIncomeETFs-ComboPRO FidelityCLOETF-PRO FidelityCLOETF-PRO FidelitySustainableHighYieldETF-PRO FidelitySustainableHighYieldETF-PRO Fidelity Clean Energy ETF Fidelity Clean Energy ETF Fidelity Clean Energy ETF Fidelity Cloud Computing ETF Fidelity Cloud Computing ETF Fidelity Cloud Computing ETF Fidelity Crypto Industry and Digital Payments ETF Fidelity Crypto Industry and Digital Payments ETF Fidelity Crypto Industry and Digital Payments ETF Fidelity Electric Vehicles and Future Transportation ETF Fidelity Electric Vehicles and Future Transportation ETF Fidelity Electric Vehicles and Future Transportation ETF Fidelity Metaverse ETF Fidelity Metaverse ETF Fidelity Metaverse ETF Fidelity Sustainable High Yield ETF Fidelity Sustainable High Yield ETF Fidelity Sustainable High Yield ETF Fidelity Enhanced Emerging Markets ETF Fidelity Enhanced Emerging Markets ETF Fidelity Enhanced Emerging Markets ETF Fidelity Enhanced International ETF Fidelity Enhanced International ETF Fidelity Enhanced International ETF Fidelity Enhanced Large Cap Core ETF Fidelity Enhanced Large Cap Core ETF Fidelity Enhanced Large Cap Core ETF Fidelity Enhanced Large Cap Growth ETF Fidelity Enhanced Large Cap Growth ETF Fidelity Enhanced Large Cap Growth ETF Fidelity Enhanced Large Cap Value ETF Fidelity Enhanced Large Cap Value ETF Fidelity Enhanced Large Cap Value ETF Fidelity Enhanced Mid Cap Core ETF Fidelity Enhanced Mid Cap Core ETF Fidelity Enhanced Mid Cap Core ETF Fidelity Enhanced Mid Cap Growth ETF Fidelity Enhanced Mid Cap Growth ETF Fidelity Enhanced Mid Cap Growth ETF Fidelity Enhanced Mid Cap Value ETF Fidelity Enhanced Mid Cap Value ETF Fidelity Enhanced Mid Cap Value ETF Fidelity Enhanced Small Cap Core ETF Fidelity Enhanced Small Cap Core ETF Fidelity Enhanced Small Cap Core ETF Fidelity Enhanced Small Cap Growth ETF Fidelity Enhanced Small Cap Growth ETF Fidelity Enhanced Small Cap Growth ETF Fidelity Enhanced Small Cap Value ETF Fidelity Enhanced Small Cap Value ETF Fidelity Enhanced Small Cap Value ETF Fidelity Enhanced U.S. All-Cap Equity ETF Fidelity Enhanced U.S. All-Cap Equity ETF Fidelity Enhanced U.S. All-Cap Equity ETF Fidelity CLO ETF Fidelity CLO ETF Fidelity CLO ETF Fidelity Enhanced High Yield ETF Fidelity Enhanced High Yield ETF Fidelity Enhanced High Yield ETF Fidelity Preferred Securities & Income ETF Fidelity Preferred Securities & Income ETF Fidelity Preferred Securities & Income ETF Fidelity Clean Energy ETF Fidelity Clean Energy ETF Fidelity Clean Energy ETF Fidelity Clean Energy ETF Fidelity Cloud Computing ETF Fidelity Cloud Computing ETF Fidelity Cloud Computing ETF Fidelity Cloud Computing ETF Fidelity Crypto Industry and Digital Payments ETF Fidelity Crypto Industry and Digital Payments ETF Fidelity Crypto Industry and Digital Payments ETF Fidelity Crypto Industry and Digital Payments ETF Fidelity Electric Vehicles and Future Transportation ETF Fidelity Electric Vehicles and Future Transportation ETF Fidelity Electric Vehicles and Future Transportation ETF Fidelity Electric Vehicles and Future Transportation ETF Fidelity Metaverse ETF Fidelity Metaverse ETF Fidelity Metaverse ETF Fidelity Metaverse ETF Fidelity Sustainable High Yield ETF Fidelity Sustainable High Yield ETF Fidelity Sustainable High Yield ETF Fidelity Sustainable High Yield ETF Fidelity Enhanced Emerging Markets ETF Fidelity Enhanced Emerging Markets ETF Fidelity Enhanced Emerging Markets ETF Fidelity Enhanced Emerging Markets ETF Fidelity Enhanced International ETF Fidelity Enhanced International ETF Fidelity Enhanced International ETF Fidelity Enhanced International ETF Fidelity Enhanced Large Cap Core ETF Fidelity Enhanced Large Cap Core ETF Fidelity Enhanced Large Cap Core ETF Fidelity Enhanced Large Cap Core ETF Fidelity Enhanced Large Cap Growth ETF Fidelity Enhanced Large Cap Growth ETF Fidelity Enhanced Large Cap Growth ETF Fidelity Enhanced Large Cap Growth ETF Fidelity Enhanced Large Cap Value ETF Fidelity Enhanced Large Cap Value ETF Fidelity Enhanced Large Cap Value ETF Fidelity Enhanced Large Cap Value ETF Fidelity Enhanced Mid Cap Core ETF Fidelity Enhanced Mid Cap Core ETF Fidelity Enhanced Mid Cap Core ETF Fidelity Enhanced Mid Cap Core ETF Fidelity Enhanced Mid Cap Growth ETF Fidelity Enhanced Mid Cap Growth ETF Fidelity Enhanced Mid Cap Growth ETF Fidelity Enhanced Mid Cap Growth ETF Fidelity Enhanced Mid Cap Value ETF Fidelity Enhanced Mid Cap Value ETF Fidelity Enhanced Mid Cap Value ETF Fidelity Enhanced Mid Cap Value ETF Fidelity Enhanced Small Cap Core ETF Fidelity Enhanced Small Cap Core ETF Fidelity Enhanced Small Cap Core ETF Fidelity Enhanced Small Cap Core ETF Fidelity Enhanced Small Cap Growth ETF Fidelity Enhanced Small Cap Growth ETF Fidelity Enhanced Small Cap Growth ETF Fidelity Enhanced Small Cap Growth ETF Fidelity Enhanced Small Cap Value ETF Fidelity Enhanced Small Cap Value ETF Fidelity Enhanced Small Cap Value ETF Fidelity Enhanced Small Cap Value ETF Fidelity Enhanced U.S. All-Cap Equity ETF Fidelity Enhanced U.S. All-Cap Equity ETF Fidelity Enhanced U.S. All-Cap Equity ETF Fidelity Enhanced U.S. All-Cap Equity ETF Fidelity CLO ETF Fidelity CLO ETF Fidelity CLO ETF Fidelity CLO ETF Fidelity Enhanced High Yield ETF Fidelity Enhanced High Yield ETF Fidelity Enhanced High Yield ETF Fidelity Enhanced High Yield ETF Fidelity Preferred Securities & Income ETF Fidelity Preferred Securities & Income ETF Fidelity Preferred Securities & Income ETF Fidelity Preferred Securities & Income ETF IXV7K IXV7K IXV7K MS159 MS159 MS159 IXV7Q IXV7Q IXV7Q IXV46 IXV46 IXV46 IXV7M IXV7M IXV7M IXV43 IXV43 IXV43 ML038 ML038 ML038 IXWRV IXWRV IXWRV LB091 LB091 LB091 MC041 MC041 MC041 MS001 MS001 MS001 SP001 SP001 SP001 RS004 RS004 RS004 RS001 RS001 RS001 RS005 RS005 RS005 RS006 RS006 RS006 RS003 RS003 RS003 RS002 RS002 RS002 ML100 ML100 ML100 IXW48 IXW48 IXW48 IXW8C IXW8C IXW8C GrowthInvestingMember GrowthInvestingMember GrowthInvestingMember CloManagerRiskMember CloManagerRiskMember CloManagerRiskMember SectorExposureMember SectorExposureMember SectorExposureMember MetaverseCompaniesMember MetaverseCompaniesMember MetaverseCompaniesMember GeographicExposureToTheChinaRegionMember GeographicExposureToTheChinaRegionMember GeographicExposureToTheChinaRegionMember CollateralizedLoanObligationsRiskMember CollateralizedLoanObligationsRiskMember CollateralizedLoanObligationsRiskMember SmallAndMidCapInvestingMember SmallAndMidCapInvestingMember SmallAndMidCapInvestingMember DigitalPaymentsProcessingCompaniesMember DigitalPaymentsProcessingCompaniesMember DigitalPaymentsProcessingCompaniesMember CorrelationToIndexMember CorrelationToIndexMember CorrelationToIndexMember InterestRateChangesMember InterestRateChangesMember InterestRateChangesMember ElectricVehiclesAndFutureTransportationCompaniesMember ElectricVehiclesAndFutureTransportationCompaniesMember ElectricVehiclesAndFutureTransportationCompaniesMember QuantitativeInvestingMember QuantitativeInvestingMember QuantitativeInvestingMember ForeignCurrencyTransactionsMember ForeignCurrencyTransactionsMember ForeignCurrencyTransactionsMember ValueInvestingMember ValueInvestingMember ValueInvestingMember GeographicExposureToChinaMember GeographicExposureToChinaMember GeographicExposureToChinaMember TradingIssuesMember TradingIssuesMember TradingIssuesMember CloudComputingCompaniesMember CloudComputingCompaniesMember CloudComputingCompaniesMember SustainabilityRiskMember SustainabilityRiskMember SustainabilityRiskMember MidCapInvestingMember MidCapInvestingMember MidCapInvestingMember PrepaymentMember PrepaymentMember PrepaymentMember GeographicExposureToEuropeMember GeographicExposureToEuropeMember GeographicExposureToEuropeMember PreferredSecuritiesMember PreferredSecuritiesMember PreferredSecuritiesMember GeographicExposureToAsiaMember GeographicExposureToAsiaMember GeographicExposureToAsiaMember ImpairmentOfCollateralMember ImpairmentOfCollateralMember ImpairmentOfCollateralMember ForeignAndEmergingMarketsRiskMember ForeignAndEmergingMarketsRiskMember ForeignAndEmergingMarketsRiskMember LeverageRiskMember LeverageRiskMember LeverageRiskMember ContingentConvertibleSecuritiesRiskMember ContingentConvertibleSecuritiesRiskMember ContingentConvertibleSecuritiesRiskMember FluctuationOfNetAssetValueAndSharePriceMember FluctuationOfNetAssetValueAndSharePriceMember FluctuationOfNetAssetValueAndSharePriceMember FinancialsIndustryConcentrationMember FinancialsIndustryConcentrationMember FinancialsIndustryConcentrationMember GeographicExposureToJapanMember GeographicExposureToJapanMember GeographicExposureToJapanMember IssuerSpecificChangesMember IssuerSpecificChangesMember IssuerSpecificChangesMember StockMarketVolatilityMember StockMarketVolatilityMember StockMarketVolatilityMember SmallCapInvestingMember SmallCapInvestingMember SmallCapInvestingMember CleanEnergyCompaniesMember CleanEnergyCompaniesMember CleanEnergyCompaniesMember CryptocurrencyAndBlockchainCompaniesMember CryptocurrencyAndBlockchainCompaniesMember CryptocurrencyAndBlockchainCompaniesMember CashTransactionsRiskMember CashTransactionsRiskMember CashTransactionsRiskMember HighPortfolioTurnoverMember HighPortfolioTurnoverMember HighPortfolioTurnoverMember FloatingRateLoanLiquidityMember FloatingRateLoanLiquidityMember FloatingRateLoanLiquidityMember MezzanineCloRiskMember MezzanineCloRiskMember MezzanineCloRiskMember ForeignExposureMember ForeignExposureMember ForeignExposureMember PassiveManagementRiskMember PassiveManagementRiskMember PassiveManagementRiskMember Shareholder Fee, Other Management Fees (as a percentage of Assets) Distribution and Service (12b-1) Fees Other Expenses (as a percentage of Assets): Acquired Fund Fees and Expenses Expenses (as a percentage of Assets) Fee Waiver or Reimbursement Net Expenses (as a percentage of Assets) After Taxes on Distributions After Taxes on Distributions and Sales Redemption Fee Redemption Fee (as a percentage of Amount Redeemed) Maximum Cumulative Sales Charge (as a percentage of Offering Price) Maximum Deferred Sales Charge (as a percentage) Risk [Axis] All Risks [Member]