v3.25.3
Shareholder Report, Holdings (Details)
Aug. 31, 2025
Fidelity Series Government Money Market Fund | EMD0Member  
Holdings [Line Items]  
Percent of Net Asset Value 69.40%
Fidelity Series Government Money Market Fund | EMD1Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.90%
Fidelity Series Government Money Market Fund | EMD2Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
Fidelity Series Government Money Market Fund | EMD3Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
Fidelity Series Government Money Market Fund | EMD4Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
Fidelity Series Government Money Market Fund | EMD5Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
Fidelity Series Government Money Market Fund | AARepurchaseAgreementsMember  
Holdings [Line Items]  
Percent of Net Asset Value 47.40%
Fidelity Series Government Money Market Fund | AAUSGovernmentAgencyDebtMember  
Holdings [Line Items]  
Percent of Net Asset Value 33.00%
Fidelity Series Government Money Market Fund | AAUSTreasuryObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 23.30%
Fidelity Series Bond Index Fund | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 36.90%
Fidelity Series Bond Index Fund | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 9.60%
Fidelity Series Bond Index Fund | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 9.40%
Fidelity Series Bond Index Fund | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.90%
Fidelity Series Bond Index Fund | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
Fidelity Series Bond Index Fund | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
Fidelity Series Bond Index Fund | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
Fidelity Series Bond Index Fund | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Fidelity Series Bond Index Fund | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Fidelity Series Bond Index Fund | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Fidelity Series Bond Index Fund | QDUSGovernmentandUSGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 71.10%
Fidelity Series Bond Index Fund | QDAAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
Fidelity Series Bond Index Fund | QDAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Fidelity Series Bond Index Fund | QDAMember  
Holdings [Line Items]  
Percent of Net Asset Value 12.70%
Fidelity Series Bond Index Fund | QDBBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 10.40%
Fidelity Series Bond Index Fund | QDBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
Fidelity Series Bond Index Fund | QDNotRatedMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
Fidelity Series Bond Index Fund | United States  
Holdings [Line Items]  
Percent of Net Asset Value 94.30%
Fidelity Series Bond Index Fund | Canada  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
Fidelity Series Bond Index Fund | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Fidelity Series Bond Index Fund | Japan  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
Fidelity Series Bond Index Fund | MultinationalMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
Fidelity Series Bond Index Fund | Mexico  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Fidelity Series Bond Index Fund | Germany  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Fidelity Series Bond Index Fund | Australia  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Fidelity Series Bond Index Fund | Spain  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Fidelity Series Bond Index Fund | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
Fidelity Series Bond Index Fund | AAUSTreasuryObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 46.50%
Fidelity Series Bond Index Fund | AACorporateBondsMember  
Holdings [Line Items]  
Percent of Net Asset Value 26.10%
Fidelity Series Bond Index Fund | AAUSGovernmentAgencyMortgageSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 24.30%
Fidelity Series Bond Index Fund | AAForeignGovernmentandGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
Fidelity Series Bond Index Fund | AACMOsandOtherMortgageRelatedSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
Fidelity Series Bond Index Fund | AAMunicipalSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
Fidelity Series Bond Index Fund | AAUSGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
Fidelity Series Bond Index Fund | AAAssetBackedSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
Fidelity Series Bond Index Fund | AAOtherInvestmentsMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Flex U.S. Bond Index Fund | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 37.00%
Fidelity Flex U.S. Bond Index Fund | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 9.90%
Fidelity Flex U.S. Bond Index Fund | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 9.40%
Fidelity Flex U.S. Bond Index Fund | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.70%
Fidelity Flex U.S. Bond Index Fund | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
Fidelity Flex U.S. Bond Index Fund | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
Fidelity Flex U.S. Bond Index Fund | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
Fidelity Flex U.S. Bond Index Fund | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Fidelity Flex U.S. Bond Index Fund | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Fidelity Flex U.S. Bond Index Fund | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
Fidelity Flex U.S. Bond Index Fund | QDUSGovernmentandUSGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 70.90%
Fidelity Flex U.S. Bond Index Fund | QDAAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
Fidelity Flex U.S. Bond Index Fund | QDAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity Flex U.S. Bond Index Fund | QDAMember  
Holdings [Line Items]  
Percent of Net Asset Value 12.50%
Fidelity Flex U.S. Bond Index Fund | QDBBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 10.60%
Fidelity Flex U.S. Bond Index Fund | QDBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
Fidelity Flex U.S. Bond Index Fund | QDNotRatedMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
Fidelity Flex U.S. Bond Index Fund | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Fidelity Flex U.S. Bond Index Fund | United States  
Holdings [Line Items]  
Percent of Net Asset Value 94.20%
Fidelity Flex U.S. Bond Index Fund | Canada  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
Fidelity Flex U.S. Bond Index Fund | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
Fidelity Flex U.S. Bond Index Fund | Japan  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
Fidelity Flex U.S. Bond Index Fund | MultinationalMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Fidelity Flex U.S. Bond Index Fund | Mexico  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
Fidelity Flex U.S. Bond Index Fund | Germany  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
Fidelity Flex U.S. Bond Index Fund | Australia  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Fidelity Flex U.S. Bond Index Fund | Spain  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Fidelity Flex U.S. Bond Index Fund | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Fidelity Flex U.S. Bond Index Fund | AAUSTreasuryObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 46.40%
Fidelity Flex U.S. Bond Index Fund | AACorporateBondsMember  
Holdings [Line Items]  
Percent of Net Asset Value 26.20%
Fidelity Flex U.S. Bond Index Fund | AAUSGovernmentAgencyMortgageSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 24.00%
Fidelity Flex U.S. Bond Index Fund | AAForeignGovernmentandGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
Fidelity Flex U.S. Bond Index Fund | AACMOsandOtherMortgageRelatedSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
Fidelity Flex U.S. Bond Index Fund | AAMunicipalSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
Fidelity Flex U.S. Bond Index Fund | AAUSGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
Fidelity Flex U.S. Bond Index Fund | AAAssetBackedSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
Fidelity Flex U.S. Bond Index Fund | AAOtherInvestmentsMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Flex U.S. Bond Index Fund | AAPreferredSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Fidelity Flex U.S. Bond Index Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Fidelity Series Investment Grade Bond Fund | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 33.70%
Fidelity Series Investment Grade Bond Fund | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 10.10%
Fidelity Series Investment Grade Bond Fund | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.90%
Fidelity Series Investment Grade Bond Fund | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
Fidelity Series Investment Grade Bond Fund | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
Fidelity Series Investment Grade Bond Fund | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity Series Investment Grade Bond Fund | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
Fidelity Series Investment Grade Bond Fund | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Fidelity Series Investment Grade Bond Fund | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
Fidelity Series Investment Grade Bond Fund | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
Fidelity Series Investment Grade Bond Fund | QDUSGovernmentandUSGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 65.50%
Fidelity Series Investment Grade Bond Fund | QDAAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 7.70%
Fidelity Series Investment Grade Bond Fund | QDAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
Fidelity Series Investment Grade Bond Fund | QDAMember  
Holdings [Line Items]  
Percent of Net Asset Value 6.50%
Fidelity Series Investment Grade Bond Fund | QDBBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 14.10%
Fidelity Series Investment Grade Bond Fund | QDBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
Fidelity Series Investment Grade Bond Fund | QDNotRatedMember  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
Fidelity Series Investment Grade Bond Fund | QDBMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
Fidelity Series Investment Grade Bond Fund | QDCCCCCCMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Series Investment Grade Bond Fund | United States  
Holdings [Line Items]  
Percent of Net Asset Value 89.60%
Fidelity Series Investment Grade Bond Fund | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
Fidelity Series Investment Grade Bond Fund | Mexico  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Fidelity Series Investment Grade Bond Fund | Germany  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
Fidelity Series Investment Grade Bond Fund | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
Fidelity Series Investment Grade Bond Fund | GrandCaymanUKOverseasTerMember  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
Fidelity Series Investment Grade Bond Fund | Ireland  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Fidelity Series Investment Grade Bond Fund | BailiwickOfJerseyMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
Fidelity Series Investment Grade Bond Fund | Switzerland  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
Fidelity Series Investment Grade Bond Fund | France  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
Fidelity Series Investment Grade Bond Fund | AAUSTreasuryObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 43.80%
Fidelity Series Investment Grade Bond Fund | AACorporateBondsMember  
Holdings [Line Items]  
Percent of Net Asset Value 21.10%
Fidelity Series Investment Grade Bond Fund | AAUSGovernmentAgencyMortgageSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 21.70%
Fidelity Series Investment Grade Bond Fund | AAForeignGovernmentandGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Series Investment Grade Bond Fund | AACMOsandOtherMortgageRelatedSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 6.70%
Fidelity Series Investment Grade Bond Fund | AAAssetBackedSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 8.70%
Fidelity Series Investment Grade Bond Fund | AAOtherInvestmentsMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Fidelity Series Investment Grade Bond Fund | AAPreferredSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Fidelity Series Investment Grade Bond Fund | AAOptionsMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity U.S. Bond Index Fund | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 38.00%
Fidelity U.S. Bond Index Fund | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
Fidelity U.S. Bond Index Fund | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 8.80%
Fidelity U.S. Bond Index Fund | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
Fidelity U.S. Bond Index Fund | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
Fidelity U.S. Bond Index Fund | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Fidelity U.S. Bond Index Fund | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Fidelity U.S. Bond Index Fund | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
Fidelity U.S. Bond Index Fund | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
Fidelity U.S. Bond Index Fund | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Fidelity U.S. Bond Index Fund | QDUSGovernmentandUSGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 71.50%
Fidelity U.S. Bond Index Fund | QDAAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
Fidelity U.S. Bond Index Fund | QDAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Fidelity U.S. Bond Index Fund | QDAMember  
Holdings [Line Items]  
Percent of Net Asset Value 12.60%
Fidelity U.S. Bond Index Fund | QDBBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 10.60%
Fidelity U.S. Bond Index Fund | QDBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
Fidelity U.S. Bond Index Fund | QDNotRatedMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
Fidelity U.S. Bond Index Fund | United States  
Holdings [Line Items]  
Percent of Net Asset Value 94.70%
Fidelity U.S. Bond Index Fund | Canada  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
Fidelity U.S. Bond Index Fund | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
Fidelity U.S. Bond Index Fund | Japan  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
Fidelity U.S. Bond Index Fund | MultinationalMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
Fidelity U.S. Bond Index Fund | Mexico  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Fidelity U.S. Bond Index Fund | Germany  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Fidelity U.S. Bond Index Fund | Australia  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Fidelity U.S. Bond Index Fund | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Fidelity U.S. Bond Index Fund | Belgium  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Fidelity U.S. Bond Index Fund | AAUSTreasuryObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 46.80%
Fidelity U.S. Bond Index Fund | AACorporateBondsMember  
Holdings [Line Items]  
Percent of Net Asset Value 25.30%
Fidelity U.S. Bond Index Fund | AAUSGovernmentAgencyMortgageSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 24.50%
Fidelity U.S. Bond Index Fund | AAForeignGovernmentandGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
Fidelity U.S. Bond Index Fund | AACMOsandOtherMortgageRelatedSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Fidelity U.S. Bond Index Fund | AAMunicipalSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
Fidelity U.S. Bond Index Fund | AAUSGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Fidelity U.S. Bond Index Fund | AAAssetBackedSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
Fidelity U.S. Bond Index Fund | AAOtherInvestmentsMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Series Short-Term Credit Fund | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.70%
Fidelity Series Short-Term Credit Fund | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Fidelity Series Short-Term Credit Fund | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
Fidelity Series Short-Term Credit Fund | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
Fidelity Series Short-Term Credit Fund | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
Fidelity Series Short-Term Credit Fund | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
Fidelity Series Short-Term Credit Fund | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
Fidelity Series Short-Term Credit Fund | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
Fidelity Series Short-Term Credit Fund | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Fidelity Series Short-Term Credit Fund | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Fidelity Series Short-Term Credit Fund | QDUSGovernmentandUSGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 7.50%
Fidelity Series Short-Term Credit Fund | QDAAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 14.20%
Fidelity Series Short-Term Credit Fund | QDAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
Fidelity Series Short-Term Credit Fund | QDAMember  
Holdings [Line Items]  
Percent of Net Asset Value 28.90%
Fidelity Series Short-Term Credit Fund | QDBBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 41.90%
Fidelity Series Short-Term Credit Fund | QDBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
Fidelity Series Short-Term Credit Fund | QDNotRatedMember  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Fidelity Series Short-Term Credit Fund | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
Fidelity Series Short-Term Credit Fund | United States  
Holdings [Line Items]  
Percent of Net Asset Value 74.70%
Fidelity Series Short-Term Credit Fund | Canada  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
Fidelity Series Short-Term Credit Fund | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
Fidelity Series Short-Term Credit Fund | Japan  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Fidelity Series Short-Term Credit Fund | Germany  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
Fidelity Series Short-Term Credit Fund | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Fidelity Series Short-Term Credit Fund | GrandCaymanUKOverseasTerMember  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
Fidelity Series Short-Term Credit Fund | Ireland  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
Fidelity Series Short-Term Credit Fund | France  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Fidelity Series Short-Term Credit Fund | Netherlands  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Fidelity Series Short-Term Credit Fund | AAUSTreasuryObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 6.70%
Fidelity Series Short-Term Credit Fund | AACorporateBondsMember  
Holdings [Line Items]  
Percent of Net Asset Value 72.10%
Fidelity Series Short-Term Credit Fund | AAUSGovernmentAgencyMortgageSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
Fidelity Series Short-Term Credit Fund | AACMOsandOtherMortgageRelatedSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Fidelity Series Short-Term Credit Fund | AAAssetBackedSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 15.30%
Fidelity Series Short-Term Credit Fund | AAOtherInvestmentsMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Fidelity Series Short-Term Credit Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
Fidelity Advisor Corporate Bond Fund - Class M | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
Fidelity Advisor Corporate Bond Fund - Class M | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity Advisor Corporate Bond Fund - Class M | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
Fidelity Advisor Corporate Bond Fund - Class M | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
Fidelity Advisor Corporate Bond Fund - Class M | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
Fidelity Advisor Corporate Bond Fund - Class M | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
Fidelity Advisor Corporate Bond Fund - Class M | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Fidelity Advisor Corporate Bond Fund - Class M | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Fidelity Advisor Corporate Bond Fund - Class M | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Fidelity Advisor Corporate Bond Fund - Class M | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Fidelity Advisor Corporate Bond Fund - Class M | QDUSGovernmentandUSGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
Fidelity Advisor Corporate Bond Fund - Class M | QDAAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Advisor Corporate Bond Fund - Class M | QDAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Fidelity Advisor Corporate Bond Fund - Class M | QDAMember  
Holdings [Line Items]  
Percent of Net Asset Value 23.10%
Fidelity Advisor Corporate Bond Fund - Class M | QDBBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 57.00%
Fidelity Advisor Corporate Bond Fund - Class M | QDBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity Advisor Corporate Bond Fund - Class M | QDNotRatedMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Advisor Corporate Bond Fund - Class M | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
Fidelity Advisor Corporate Bond Fund - Class M | QDBMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Fidelity Advisor Corporate Bond Fund - Class M | United States  
Holdings [Line Items]  
Percent of Net Asset Value 80.50%
Fidelity Advisor Corporate Bond Fund - Class M | Canada  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
Fidelity Advisor Corporate Bond Fund - Class M | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
Fidelity Advisor Corporate Bond Fund - Class M | Japan  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Fidelity Advisor Corporate Bond Fund - Class M | Germany  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
Fidelity Advisor Corporate Bond Fund - Class M | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Fidelity Advisor Corporate Bond Fund - Class M | Ireland  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity Advisor Corporate Bond Fund - Class M | Switzerland  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Fidelity Advisor Corporate Bond Fund - Class M | France  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Fidelity Advisor Corporate Bond Fund - Class M | Netherlands  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
Fidelity Advisor Corporate Bond Fund - Class M | AAUSTreasuryObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
Fidelity Advisor Corporate Bond Fund - Class M | AACorporateBondsMember  
Holdings [Line Items]  
Percent of Net Asset Value 85.30%
Fidelity Advisor Corporate Bond Fund - Class M | AAForeignGovernmentandGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Advisor Corporate Bond Fund - Class M | AACMOsandOtherMortgageRelatedSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Advisor Corporate Bond Fund - Class M | AAMunicipalSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Fidelity Advisor Corporate Bond Fund - Class M | AAAssetBackedSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
Fidelity Advisor Corporate Bond Fund - Class M | AAOtherInvestmentsMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Advisor Corporate Bond Fund - Class M | AAPreferredSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
Fidelity Advisor Corporate Bond Fund - Class M | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
Fidelity Corporate Bond Fund | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
Fidelity Corporate Bond Fund | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity Corporate Bond Fund | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
Fidelity Corporate Bond Fund | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
Fidelity Corporate Bond Fund | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
Fidelity Corporate Bond Fund | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
Fidelity Corporate Bond Fund | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Fidelity Corporate Bond Fund | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Fidelity Corporate Bond Fund | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Fidelity Corporate Bond Fund | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Fidelity Corporate Bond Fund | QDUSGovernmentandUSGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
Fidelity Corporate Bond Fund | QDAAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Corporate Bond Fund | QDAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Fidelity Corporate Bond Fund | QDAMember  
Holdings [Line Items]  
Percent of Net Asset Value 23.10%
Fidelity Corporate Bond Fund | QDBBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 57.00%
Fidelity Corporate Bond Fund | QDBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity Corporate Bond Fund | QDNotRatedMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Corporate Bond Fund | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
Fidelity Corporate Bond Fund | QDBMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Fidelity Corporate Bond Fund | United States  
Holdings [Line Items]  
Percent of Net Asset Value 80.50%
Fidelity Corporate Bond Fund | Canada  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
Fidelity Corporate Bond Fund | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
Fidelity Corporate Bond Fund | Japan  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Fidelity Corporate Bond Fund | Germany  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
Fidelity Corporate Bond Fund | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Fidelity Corporate Bond Fund | Ireland  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity Corporate Bond Fund | Switzerland  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Fidelity Corporate Bond Fund | France  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Fidelity Corporate Bond Fund | Netherlands  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
Fidelity Corporate Bond Fund | AAUSTreasuryObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
Fidelity Corporate Bond Fund | AACorporateBondsMember  
Holdings [Line Items]  
Percent of Net Asset Value 85.30%
Fidelity Corporate Bond Fund | AAForeignGovernmentandGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Corporate Bond Fund | AACMOsandOtherMortgageRelatedSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Corporate Bond Fund | AAMunicipalSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Fidelity Corporate Bond Fund | AAAssetBackedSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
Fidelity Corporate Bond Fund | AAOtherInvestmentsMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Corporate Bond Fund | AAPreferredSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
Fidelity Corporate Bond Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
Fidelity Advisor Corporate Bond Fund - Class C | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
Fidelity Advisor Corporate Bond Fund - Class C | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity Advisor Corporate Bond Fund - Class C | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
Fidelity Advisor Corporate Bond Fund - Class C | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
Fidelity Advisor Corporate Bond Fund - Class C | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
Fidelity Advisor Corporate Bond Fund - Class C | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
Fidelity Advisor Corporate Bond Fund - Class C | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Fidelity Advisor Corporate Bond Fund - Class C | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Fidelity Advisor Corporate Bond Fund - Class C | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Fidelity Advisor Corporate Bond Fund - Class C | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Fidelity Advisor Corporate Bond Fund - Class C | QDUSGovernmentandUSGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
Fidelity Advisor Corporate Bond Fund - Class C | QDAAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Advisor Corporate Bond Fund - Class C | QDAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Fidelity Advisor Corporate Bond Fund - Class C | QDAMember  
Holdings [Line Items]  
Percent of Net Asset Value 23.10%
Fidelity Advisor Corporate Bond Fund - Class C | QDBBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 57.00%
Fidelity Advisor Corporate Bond Fund - Class C | QDBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity Advisor Corporate Bond Fund - Class C | QDNotRatedMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Advisor Corporate Bond Fund - Class C | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
Fidelity Advisor Corporate Bond Fund - Class C | QDBMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Fidelity Advisor Corporate Bond Fund - Class C | United States  
Holdings [Line Items]  
Percent of Net Asset Value 80.50%
Fidelity Advisor Corporate Bond Fund - Class C | Canada  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
Fidelity Advisor Corporate Bond Fund - Class C | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
Fidelity Advisor Corporate Bond Fund - Class C | Japan  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Fidelity Advisor Corporate Bond Fund - Class C | Germany  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
Fidelity Advisor Corporate Bond Fund - Class C | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Fidelity Advisor Corporate Bond Fund - Class C | Ireland  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity Advisor Corporate Bond Fund - Class C | Switzerland  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Fidelity Advisor Corporate Bond Fund - Class C | France  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Fidelity Advisor Corporate Bond Fund - Class C | Netherlands  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
Fidelity Advisor Corporate Bond Fund - Class C | AAUSTreasuryObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
Fidelity Advisor Corporate Bond Fund - Class C | AACorporateBondsMember  
Holdings [Line Items]  
Percent of Net Asset Value 85.30%
Fidelity Advisor Corporate Bond Fund - Class C | AAForeignGovernmentandGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Advisor Corporate Bond Fund - Class C | AACMOsandOtherMortgageRelatedSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Advisor Corporate Bond Fund - Class C | AAMunicipalSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Fidelity Advisor Corporate Bond Fund - Class C | AAAssetBackedSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
Fidelity Advisor Corporate Bond Fund - Class C | AAOtherInvestmentsMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Advisor Corporate Bond Fund - Class C | AAPreferredSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
Fidelity Advisor Corporate Bond Fund - Class C | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
Fidelity Advisor Corporate Bond Fund - Class Z | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
Fidelity Advisor Corporate Bond Fund - Class Z | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity Advisor Corporate Bond Fund - Class Z | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
Fidelity Advisor Corporate Bond Fund - Class Z | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
Fidelity Advisor Corporate Bond Fund - Class Z | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
Fidelity Advisor Corporate Bond Fund - Class Z | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
Fidelity Advisor Corporate Bond Fund - Class Z | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Fidelity Advisor Corporate Bond Fund - Class Z | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Fidelity Advisor Corporate Bond Fund - Class Z | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Fidelity Advisor Corporate Bond Fund - Class Z | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Fidelity Advisor Corporate Bond Fund - Class Z | QDUSGovernmentandUSGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
Fidelity Advisor Corporate Bond Fund - Class Z | QDAAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Advisor Corporate Bond Fund - Class Z | QDAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Fidelity Advisor Corporate Bond Fund - Class Z | QDAMember  
Holdings [Line Items]  
Percent of Net Asset Value 23.10%
Fidelity Advisor Corporate Bond Fund - Class Z | QDBBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 57.00%
Fidelity Advisor Corporate Bond Fund - Class Z | QDBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity Advisor Corporate Bond Fund - Class Z | QDNotRatedMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Advisor Corporate Bond Fund - Class Z | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
Fidelity Advisor Corporate Bond Fund - Class Z | QDBMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Fidelity Advisor Corporate Bond Fund - Class Z | United States  
Holdings [Line Items]  
Percent of Net Asset Value 80.50%
Fidelity Advisor Corporate Bond Fund - Class Z | Canada  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
Fidelity Advisor Corporate Bond Fund - Class Z | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
Fidelity Advisor Corporate Bond Fund - Class Z | Japan  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Fidelity Advisor Corporate Bond Fund - Class Z | Germany  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
Fidelity Advisor Corporate Bond Fund - Class Z | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Fidelity Advisor Corporate Bond Fund - Class Z | Ireland  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity Advisor Corporate Bond Fund - Class Z | Switzerland  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Fidelity Advisor Corporate Bond Fund - Class Z | France  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Fidelity Advisor Corporate Bond Fund - Class Z | Netherlands  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
Fidelity Advisor Corporate Bond Fund - Class Z | AAUSTreasuryObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
Fidelity Advisor Corporate Bond Fund - Class Z | AACorporateBondsMember  
Holdings [Line Items]  
Percent of Net Asset Value 85.30%
Fidelity Advisor Corporate Bond Fund - Class Z | AAForeignGovernmentandGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Advisor Corporate Bond Fund - Class Z | AACMOsandOtherMortgageRelatedSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Advisor Corporate Bond Fund - Class Z | AAMunicipalSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Fidelity Advisor Corporate Bond Fund - Class Z | AAAssetBackedSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
Fidelity Advisor Corporate Bond Fund - Class Z | AAOtherInvestmentsMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Advisor Corporate Bond Fund - Class Z | AAPreferredSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
Fidelity Advisor Corporate Bond Fund - Class Z | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
Fidelity Advisor Corporate Bond Fund - Class I | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
Fidelity Advisor Corporate Bond Fund - Class I | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity Advisor Corporate Bond Fund - Class I | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
Fidelity Advisor Corporate Bond Fund - Class I | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
Fidelity Advisor Corporate Bond Fund - Class I | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
Fidelity Advisor Corporate Bond Fund - Class I | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
Fidelity Advisor Corporate Bond Fund - Class I | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Fidelity Advisor Corporate Bond Fund - Class I | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Fidelity Advisor Corporate Bond Fund - Class I | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Fidelity Advisor Corporate Bond Fund - Class I | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Fidelity Advisor Corporate Bond Fund - Class I | QDUSGovernmentandUSGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
Fidelity Advisor Corporate Bond Fund - Class I | QDAAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Advisor Corporate Bond Fund - Class I | QDAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Fidelity Advisor Corporate Bond Fund - Class I | QDAMember  
Holdings [Line Items]  
Percent of Net Asset Value 23.10%
Fidelity Advisor Corporate Bond Fund - Class I | QDBBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 57.00%
Fidelity Advisor Corporate Bond Fund - Class I | QDBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity Advisor Corporate Bond Fund - Class I | QDNotRatedMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Advisor Corporate Bond Fund - Class I | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
Fidelity Advisor Corporate Bond Fund - Class I | QDBMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Fidelity Advisor Corporate Bond Fund - Class I | United States  
Holdings [Line Items]  
Percent of Net Asset Value 80.50%
Fidelity Advisor Corporate Bond Fund - Class I | Canada  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
Fidelity Advisor Corporate Bond Fund - Class I | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
Fidelity Advisor Corporate Bond Fund - Class I | Japan  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Fidelity Advisor Corporate Bond Fund - Class I | Germany  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
Fidelity Advisor Corporate Bond Fund - Class I | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Fidelity Advisor Corporate Bond Fund - Class I | Ireland  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity Advisor Corporate Bond Fund - Class I | Switzerland  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Fidelity Advisor Corporate Bond Fund - Class I | France  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Fidelity Advisor Corporate Bond Fund - Class I | Netherlands  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
Fidelity Advisor Corporate Bond Fund - Class I | AAUSTreasuryObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
Fidelity Advisor Corporate Bond Fund - Class I | AACorporateBondsMember  
Holdings [Line Items]  
Percent of Net Asset Value 85.30%
Fidelity Advisor Corporate Bond Fund - Class I | AAForeignGovernmentandGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Advisor Corporate Bond Fund - Class I | AACMOsandOtherMortgageRelatedSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Advisor Corporate Bond Fund - Class I | AAMunicipalSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Fidelity Advisor Corporate Bond Fund - Class I | AAAssetBackedSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
Fidelity Advisor Corporate Bond Fund - Class I | AAOtherInvestmentsMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Advisor Corporate Bond Fund - Class I | AAPreferredSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
Fidelity Advisor Corporate Bond Fund - Class I | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
Fidelity Advisor Corporate Bond Fund - Class A | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
Fidelity Advisor Corporate Bond Fund - Class A | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity Advisor Corporate Bond Fund - Class A | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
Fidelity Advisor Corporate Bond Fund - Class A | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
Fidelity Advisor Corporate Bond Fund - Class A | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
Fidelity Advisor Corporate Bond Fund - Class A | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
Fidelity Advisor Corporate Bond Fund - Class A | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Fidelity Advisor Corporate Bond Fund - Class A | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Fidelity Advisor Corporate Bond Fund - Class A | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Fidelity Advisor Corporate Bond Fund - Class A | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Fidelity Advisor Corporate Bond Fund - Class A | QDUSGovernmentandUSGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
Fidelity Advisor Corporate Bond Fund - Class A | QDAAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Advisor Corporate Bond Fund - Class A | QDAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Fidelity Advisor Corporate Bond Fund - Class A | QDAMember  
Holdings [Line Items]  
Percent of Net Asset Value 23.10%
Fidelity Advisor Corporate Bond Fund - Class A | QDBBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 57.00%
Fidelity Advisor Corporate Bond Fund - Class A | QDBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity Advisor Corporate Bond Fund - Class A | QDNotRatedMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Advisor Corporate Bond Fund - Class A | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
Fidelity Advisor Corporate Bond Fund - Class A | QDBMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Fidelity Advisor Corporate Bond Fund - Class A | United States  
Holdings [Line Items]  
Percent of Net Asset Value 80.50%
Fidelity Advisor Corporate Bond Fund - Class A | Canada  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
Fidelity Advisor Corporate Bond Fund - Class A | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
Fidelity Advisor Corporate Bond Fund - Class A | Japan  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Fidelity Advisor Corporate Bond Fund - Class A | Germany  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
Fidelity Advisor Corporate Bond Fund - Class A | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Fidelity Advisor Corporate Bond Fund - Class A | Ireland  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity Advisor Corporate Bond Fund - Class A | Switzerland  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Fidelity Advisor Corporate Bond Fund - Class A | France  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Fidelity Advisor Corporate Bond Fund - Class A | Netherlands  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
Fidelity Advisor Corporate Bond Fund - Class A | AAUSTreasuryObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
Fidelity Advisor Corporate Bond Fund - Class A | AACorporateBondsMember  
Holdings [Line Items]  
Percent of Net Asset Value 85.30%
Fidelity Advisor Corporate Bond Fund - Class A | AAForeignGovernmentandGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Advisor Corporate Bond Fund - Class A | AACMOsandOtherMortgageRelatedSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Advisor Corporate Bond Fund - Class A | AAMunicipalSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Fidelity Advisor Corporate Bond Fund - Class A | AAAssetBackedSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
Fidelity Advisor Corporate Bond Fund - Class A | AAOtherInvestmentsMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Advisor Corporate Bond Fund - Class A | AAPreferredSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
Fidelity Advisor Corporate Bond Fund - Class A | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%