Investment Risks	Oct. 30, 2025
FidelityCorporateBondFund-AMCIZPRO | Fidelity Corporate Bond Fund | Risk Lose Money [Member]
Prospectus Line Items
Risk [Text Block]	You could lose money by investing in the fund.
FidelityCorporateBondFund-AMCIZPRO | Fidelity Corporate Bond Fund | 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 .
FidelityCorporateBondFund-AMCIZPRO | Fidelity Corporate Bond Fund | InterestRateChangesMember
Prospectus Line Items
Risk [Text Block]	Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
FidelityCorporateBondFund-AMCIZPRO | Fidelity Corporate Bond Fund | 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.
FidelityCorporateBondFund-AMCIZPRO | Fidelity Corporate Bond Fund | ForeignExposureMember
Prospectus Line Items
Risk [Text Block]	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.
FidelityCorporateBondFund-AMCIZPRO | Fidelity Corporate Bond Fund | 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) 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 can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.
FidelityCorporateBondFund-AMCIZPRO | Fidelity Corporate Bond Fund | 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.
FidelitySeriesBondIndexFund-PRO | Fidelity Series Bond Index Fund | Risk Lose Money [Member]
Prospectus Line Items
Risk [Text Block]	You could lose money by investing in the fund.
FidelitySeriesBondIndexFund-PRO | Fidelity Series Bond Index Fund | 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 .
FidelitySeriesBondIndexFund-PRO | Fidelity Series Bond Index Fund | InterestRateChangesMember
Prospectus Line Items
Risk [Text Block]	Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
FidelitySeriesBondIndexFund-PRO | Fidelity Series Bond Index Fund | 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.
FidelitySeriesBondIndexFund-PRO | Fidelity Series Bond Index Fund | ForeignExposureMember
Prospectus Line Items
Risk [Text Block]	Foreign Exposure. Entities located in foreign countries can be affected by adverse political, regulatory, market, or economic developments in those countries.
FidelitySeriesBondIndexFund-PRO | Fidelity Series Bond Index Fund | 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.
FidelitySeriesBondIndexFund-PRO | Fidelity Series Bond Index Fund | PassiveManagementRiskMember
Prospectus Line Items
Risk [Text Block]	Passive Management Risk. The fund is managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of the fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the fund's performance could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. The fund will be concentrated to approximately the same extent that the fund's index concentrates in the securities of issuers in a particular industry.
FidelitySeriesBondIndexFund-PRO | Fidelity Series Bond Index Fund | 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.
FidelitySeriesBondIndexFund-PRO | Fidelity Series Bond Index Fund | CorrelationToIndexMember
Prospectus Line Items
Risk [Text Block]	Correlation to Index. The performance of the fund and its underlying index may vary somewhat due to factors such as fees and expenses of the fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on the fund and its shareholders.
FidelitySeriesInvestmentGradeBondFund-PRO | Fidelity Series Investment Grade Bond Fund | Risk Lose Money [Member]
Prospectus Line Items
Risk [Text Block]	You could lose money by investing in the fund.
FidelitySeriesInvestmentGradeBondFund-PRO | Fidelity Series Investment Grade Bond Fund | 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 .
FidelitySeriesInvestmentGradeBondFund-PRO | Fidelity Series Investment Grade Bond Fund | InterestRateChangesMember
Prospectus Line Items
Risk [Text Block]	Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
FidelitySeriesInvestmentGradeBondFund-PRO | Fidelity Series Investment Grade Bond Fund | 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.
FidelitySeriesInvestmentGradeBondFund-PRO | Fidelity Series Investment Grade Bond Fund | HighPortfolioTurnoverMember
Prospectus Line Items
Risk [Text Block]	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.
FidelitySeriesInvestmentGradeBondFund-PRO | Fidelity Series Investment Grade Bond Fund | ForeignExposureMember
Prospectus Line Items
Risk [Text Block]	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.
FidelitySeriesInvestmentGradeBondFund-PRO | Fidelity Series Investment Grade Bond Fund | 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) 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 can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.
FidelitySeriesInvestmentGradeBondFund-PRO | Fidelity Series Investment Grade Bond Fund | 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.
FidelityFlexUSBondIndexFund-PRO | Fidelity Flex U.S. Bond Index Fund | Risk Lose Money [Member]
Prospectus Line Items
Risk [Text Block]	You could lose money by investing in the fund.
FidelityFlexUSBondIndexFund-PRO | Fidelity Flex U.S. Bond Index Fund | 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 .
FidelityFlexUSBondIndexFund-PRO | Fidelity Flex U.S. Bond Index Fund | InterestRateChangesMember
Prospectus Line Items
Risk [Text Block]	Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
FidelityFlexUSBondIndexFund-PRO | Fidelity Flex U.S. Bond Index Fund | 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.
FidelityFlexUSBondIndexFund-PRO | Fidelity Flex U.S. Bond Index Fund | ForeignExposureMember
Prospectus Line Items
Risk [Text Block]	Foreign Exposure. Entities located in foreign countries can be affected by adverse political, regulatory, market, or economic developments in those countries.
FidelityFlexUSBondIndexFund-PRO | Fidelity Flex U.S. Bond Index Fund | 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.
FidelityFlexUSBondIndexFund-PRO | Fidelity Flex U.S. Bond Index Fund | PassiveManagementRiskMember
Prospectus Line Items
Risk [Text Block]	Passive Management Risk. The fund is managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of the fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the fund's performance could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers.
FidelityFlexUSBondIndexFund-PRO | Fidelity Flex U.S. Bond Index Fund | 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.
FidelityFlexUSBondIndexFund-PRO | Fidelity Flex U.S. Bond Index Fund | CorrelationToIndexMember
Prospectus Line Items
Risk [Text Block]	Correlation to Index. The performance of the fund and its underlying index may vary somewhat due to factors such as fees and expenses of the fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on the fund and its shareholders.
FidelityUSBondIndexFund-PRO | Fidelity U.S. Bond Index Fund | Risk Lose Money [Member]
Prospectus Line Items
Risk [Text Block]	You could lose money by investing in the fund.
FidelityUSBondIndexFund-PRO | Fidelity U.S. Bond Index Fund | 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 .
FidelityUSBondIndexFund-PRO | Fidelity U.S. Bond Index Fund | InterestRateChangesMember
Prospectus Line Items
Risk [Text Block]	Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
FidelityUSBondIndexFund-PRO | Fidelity U.S. Bond Index Fund | 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.
FidelityUSBondIndexFund-PRO | Fidelity U.S. Bond Index Fund | ForeignExposureMember
Prospectus Line Items
Risk [Text Block]	Foreign Exposure. Entities located in foreign countries can be affected by adverse political, regulatory, market, or economic developments in those countries.
FidelityUSBondIndexFund-PRO | Fidelity U.S. Bond Index Fund | 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.
FidelityUSBondIndexFund-PRO | Fidelity U.S. Bond Index Fund | PassiveManagementRiskMember
Prospectus Line Items
Risk [Text Block]	Passive Management Risk. The fund is managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of the fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the fund's performance could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers.
FidelityUSBondIndexFund-PRO | Fidelity U.S. Bond Index Fund | 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.
FidelityUSBondIndexFund-PRO | Fidelity U.S. Bond Index Fund | CorrelationToIndexMember
Prospectus Line Items
Risk [Text Block]	Correlation to Index. The performance of the fund and its underlying index may vary somewhat due to factors such as fees and expenses of the fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on the fund and its shareholders.
FidelitySeriesShort-TermCreditFund-PRO | Fidelity Series Short-Term Credit Fund | Risk Lose Money [Member]
Prospectus Line Items
Risk [Text Block]	You could lose money by investing in the fund.
FidelitySeriesShort-TermCreditFund-PRO | Fidelity Series Short-Term Credit Fund | 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 .
FidelitySeriesShort-TermCreditFund-PRO | Fidelity Series Short-Term Credit Fund | InterestRateChangesMember
Prospectus Line Items
Risk [Text Block]	Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
FidelitySeriesShort-TermCreditFund-PRO | Fidelity Series Short-Term Credit Fund | 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.
FidelitySeriesShort-TermCreditFund-PRO | Fidelity Series Short-Term Credit Fund | ForeignExposureMember
Prospectus Line Items
Risk [Text Block]	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.
FidelitySeriesShort-TermCreditFund-PRO | Fidelity Series Short-Term Credit Fund | 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.
FidelitySeriesShort-TermCreditFund-PRO | Fidelity Series Short-Term Credit Fund | 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.
FidelityCorporateBondFund-RetailPRO | Fidelity Corporate Bond Fund | Risk Lose Money [Member]
Prospectus Line Items
Risk [Text Block]	You could lose money by investing in the fund.
FidelityCorporateBondFund-RetailPRO | Fidelity Corporate Bond Fund | 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 .
FidelityCorporateBondFund-RetailPRO | Fidelity Corporate Bond Fund | InterestRateChangesMember
Prospectus Line Items
Risk [Text Block]	Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
FidelityCorporateBondFund-RetailPRO | Fidelity Corporate Bond Fund | 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.
FidelityCorporateBondFund-RetailPRO | Fidelity Corporate Bond Fund | ForeignExposureMember
Prospectus Line Items
Risk [Text Block]	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.
FidelityCorporateBondFund-RetailPRO | Fidelity Corporate Bond Fund | 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) 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 can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.
FidelityCorporateBondFund-RetailPRO | Fidelity Corporate Bond Fund | 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.
FidelitySeriesGovernmentMoneyMarketFund-PRO | Fidelity Series Government Money Market Fund | Risk Lose Money [Member]
Prospectus Line Items
Risk [Text Block]	You could lose money by investing in the fund .
FidelitySeriesGovernmentMoneyMarketFund-PRO | Fidelity Series Government Money Market Fund | Risk Money Market Fund May Not Preserve Dollar [Member]
Prospectus Line Items
Risk [Text Block]	Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so .
FidelitySeriesGovernmentMoneyMarketFund-PRO | Fidelity Series Government Money Market Fund | Risk Money Market Fund Sponsor May Not Provide Support [Member]
Prospectus Line Items
Risk [Text Block]	Fidelity   Investments and its affiliates, the fund's sponsor, is not required to reimburse the fund for losses, and you should not expect that the sponsor will provide financial support to the fund at any time, including during periods of market stress.
FidelitySeriesGovernmentMoneyMarketFund-PRO | Fidelity Series Government Money Market Fund | Risk Not Insured Depository Institution [Member]
Prospectus Line Items
Risk [Text Block]	An investment in the fund is not a bank account and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency .
FidelitySeriesGovernmentMoneyMarketFund-PRO | Fidelity Series Government Money Market Fund | InterestRateChangesMember
Prospectus Line Items
Risk [Text Block]	Interest Rate Changes. Interest rate increases can cause the price of a money market security to decrease.
FidelitySeriesGovernmentMoneyMarketFund-PRO | Fidelity Series Government Money Market Fund | IncomeRiskMember
Prospectus Line Items
Risk [Text Block]	Income Risk. A low or negative interest rate environment can adversely affect the fund's yield.
FidelitySeriesGovernmentMoneyMarketFund-PRO | Fidelity Series Government Money Market Fund | IssuerSpecificChangesMember
Prospectus Line Items
Risk [Text Block]	Issuer-Specific Changes. 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 money market security to decrease.
FidelitySeriesGovernmentMoneyMarketFund-PRO | Fidelity Series Government Money Market Fund | USGovernmentObligationsRiskMember
Prospectus Line Items
Risk [Text Block]	U.S. Government Obligations Risk. Certain securities in which the fund may invest, including securities issued by certain U.S. Government agencies and U.S. Government sponsored enterprises, are not guaranteed by the U.S. Government or supported by the full faith and credit of the United States.
Document Type	485BPOS