Risk/Return Summary - FidelityMunicipalCorePlusBondFund-RetailPRO - FidelityMunicipalCorePlusBondFund-RetailPRO - Fidelity Municipal Core Plus Bond Fund	Apr. 01, 2025
Risk Lose Money [Text]
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Risk Text Block	You could lose money by investing in the fund.
Risk Not Insured Depository Institution [Text]
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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 .
LeverageRiskMember
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Risk Text Block	Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly.
IssuerSpecificChangesMember
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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.
InterestRateChangesMember
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Risk Text Block	Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
PrepaymentMember
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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.
MunicipalMarketVolatilityMember
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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.

Risk/Return Summary - FidelityMunicipalCorePlusBondFund-RetailPRO - FidelityMunicipalCorePlusBondFund-RetailPRO - Fidelity Municipal Core Plus Bond Fund

Apr. 01, 2025

You could lose money by investing in the fund.

Risk Not Insured Depository Institution [Text]

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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 .

LeverageRiskMember

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Risk Text Block

Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly.

IssuerSpecificChangesMember

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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.

InterestRateChangesMember

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Risk Text Block

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

PrepaymentMember

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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.

MunicipalMarketVolatilityMember

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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.