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Fidelity Low Duration Bond ETF  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Fund Summary Fund: Fidelity® Low Duration Bond ETF
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
Fidelity® Low Duration Bond ETF seeks to obtain a high level of current income consistent with preservation of capital.
Expense [Heading] rr_ExpenseHeading Fee Table
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
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.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees(fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Operating Expenses(expenses that you pay each year as a % of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
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.
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates Based on estimated amounts for the current fiscal year.
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
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:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
• Normally investing at least 80% of assets in investment-grade debt securities (those of medium and high quality) of all types and repurchase agreements for those securities.
• Normally maintaining a duration of 1 year or less.
• Managing the fund to have similar overall interest rate risk to the Bloomberg US Treasury Bill: 6‑9 Months Index.
• Normally maintaining a dollar-weighted average maturity of two years or less.
• Allocating assets across different market sectors and maturities.
• Investing more than 25% of total assets in the financial services industries.
• Investing in domestic and foreign issuers.
• Analyzing the credit quality of the issuer, security-specific features, current and potential future valuation, and trading opportunities to select investments.
• Engaging in transactions that have a leveraging effect on the fund, including investments in derivatives — such as swaps (interest rate, total return, and credit default), options, and futures contracts — and forward-settling securities, to adjust the fund’s risk exposure.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
Performance history will be available for the fund after the fund has been in operation for one calendar year.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess Performance history will be available for the fund after the fund has been in operation for one calendar year.
Fidelity Low Duration Bond ETF | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock You could lose money by investing in the fund.
Fidelity Low Duration Bond ETF | Risk Not Insured Depository Institution [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock 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.
Fidelity Low Duration Bond ETF | Interest Rate Changes [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
Fidelity Low Duration Bond ETF | Foreign Exposure [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
• 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.
Fidelity Low Duration Bond ETF | Financial Services Concentration [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
• Financial Services Concentration. Changes in government regulation and interest rates and economic downturns can have a significant negative effect on issuers in the financial services sector, including the price of their securities or their ability to meet their payment obligations.
Fidelity Low Duration Bond ETF | Prepayment [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security’s maturity can cause greater price volatility if interest rates change.
Fidelity Low Duration Bond ETF | Issuer Specific Changes [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
• 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.
A decline in the credit quality of an issuer or a provider of credit support or a maturity-shortening structure for a security can cause the price of a security to decrease.
Fidelity Low Duration Bond ETF | Leverage Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
• Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly.
Fidelity Low Duration Bond ETF | Fluctuation of Net Asset Value and Share Price [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
• 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, the market for shares may become less liquid in response to deteriorating liquidity in the markets for the fund’s underlying portfolio holdings.
Fidelity Low Duration Bond ETF | Trading Issues [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
• 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.
Fidelity Low Duration Bond ETF | Cash Transactions Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
• Cash Transactions Risk. Unlike certain ETFs, the fund may effect some or all creations and redemptions using
cash, rather than in‑kind securities. As a result, an investment in the fund may be less tax‑efficient than an investment in an ETF that distributes portfolio securities entirely in‑kind.
Fidelity Low Duration Bond ETF | Fidelity Low Duration Bond ETF  
Risk/Return: rr_RiskReturnAbstract  
Shareholder fees (fees paid directly from your investment) rr_ShareholderFeeOther none
Management fee rr_ManagementFeesOverAssets 0.20%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets none [1]
Total annual operating expenses rr_ExpensesOverAssets 0.20%
1 year rr_ExpenseExampleYear01 $ 20
3 years rr_ExpenseExampleYear03 $ 64
[1] Based on estimated amounts for the current fiscal year.