Investment Risks |
May 30, 2026 |
|---|---|
| FidelityMunicipalBondOpportunitiesETF-PRO | Fidelity Municipal Bond Opportunities ETF | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityMunicipalBondOpportunitiesETF-PRO | Fidelity Municipal Bond Opportunities ETF | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityMunicipalBondOpportunitiesETF-PRO | Fidelity Municipal Bond Opportunities ETF | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease. |
| FidelityMunicipalBondOpportunitiesETF-PRO | Fidelity Municipal Bond Opportunities ETF | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityMunicipalBondOpportunitiesETF-PRO | Fidelity Municipal Bond Opportunities ETF | CashTransactionsRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityMunicipalBondOpportunitiesETF-PRO | Fidelity Municipal Bond Opportunities ETF | FluctuationOfNetAssetValueAndSharePriceMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityMunicipalBondOpportunitiesETF-PRO | Fidelity Municipal Bond Opportunities ETF | TradingIssuesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. Decisions by market makers or Authorized Participants to reduce their role with respect to market making or creation and redemption activities during times of market stress, or a decline in the number of Authorized Participants due to decisions to exit the business, bankruptcy, or other factors, could inhibit the effectiveness of the arbitrage process in maintaining the relationship between the underlying value of the fund's portfolio securities and the market price of fund shares. In addition, trading may be halted, for example, due to market conditions. |
| FidelityMunicipalBondOpportunitiesETF-PRO | Fidelity Municipal Bond Opportunities ETF | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. |
| FidelityMunicipalBondOpportunitiesETF-PRO | Fidelity Municipal Bond Opportunities ETF | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityMunicipalBondOpportunitiesETF-PRO | Fidelity Municipal Bond Opportunities ETF | MunicipalMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Municipal Market Volatility. The municipal market is volatile and can be significantly affected by adverse tax, legislative, or political changes and the financial condition of the issuers of municipal securities. |
| Document Type | 485BPOS |