0000751199 fmr:C000182864Member 2024-08-31 2025-08-31 0000751199 fmr:C000182864_LG_ClassMember_9YRMember 2016-08-31 2025-08-31 0000751199 fmr:C000182864_ClassMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000182864_ClassMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000182864_ClassMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000182864_ClassMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000182864_ClassMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000182864_ClassMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000182864_ClassMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000182864_ClassMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000182864_ClassMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000182864_LG_1_AdditionalIndexMember_9YRMember 2016-08-31 2025-08-31 0000751199 fmr:C000182864_1_AdditionalIndexMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000182864_1_AdditionalIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000182864_1_AdditionalIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000182864_1_AdditionalIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000182864_1_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000182864_1_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000182864_1_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000182864_1_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000182864_1_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000182864_NoLoadClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000182864_NoLoadClassMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000182864_NoLoadClassMember_2024-09-01_2025-08-31Member 2024-08-31 2025-08-31 0000751199 fmr:C000182864_0_BBIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000182864_0_BBIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000182864_0_BBIndexMember_LOCMember 2024-08-31 2025-08-31 0000751199 fmr:C000182864Member 2017-05-25 2025-08-31 0000751199 fmr:C000182864Member 2025-08-31 0000751199 fmr:C000182864Member fmr:QDUSGovernmentandUSGovernmentAgencyObligationsMember 2025-08-31 0000751199 fmr:C000182864Member fmr:QDAAAMember 2025-08-31 0000751199 fmr:C000182864Member fmr:QDAAMember 2025-08-31 0000751199 fmr:C000182864Member fmr:QDAMember 2025-08-31 0000751199 fmr:C000182864Member fmr:QDBBBMember 2025-08-31 0000751199 fmr:C000182864Member fmr:QDBBMember 2025-08-31 0000751199 fmr:C000182864Member fmr:QDBMember 2025-08-31 0000751199 fmr:C000182864Member fmr:QDCCCCCCMember 2025-08-31 0000751199 fmr:C000182864Member fmr:QDDMember 2025-08-31 0000751199 fmr:C000182864Member fmr:QDNotRatedMember 2025-08-31 0000751199 fmr:C000182864Member fmr:QDEquitiesMember 2025-08-31 0000751199 fmr:AAUSTreasuryObligationsMember fmr:C000182864Member 2025-08-31 0000751199 fmr:AACorporateBondsMember fmr:C000182864Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyMortgageSecuritiesMember fmr:C000182864Member 2025-08-31 0000751199 fmr:AAAssetBackedSecuritiesMember fmr:C000182864Member 2025-08-31 0000751199 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000182864Member 2025-08-31 0000751199 fmr:AABankLoanObligationsMember fmr:C000182864Member 2025-08-31 0000751199 fmr:AAForeignGovernmentandGovernmentAgencyObligationsMember fmr:C000182864Member 2025-08-31 0000751199 fmr:AAPreferredSecuritiesMember fmr:C000182864Member 2025-08-31 0000751199 fmr:AACommonStocksMember fmr:C000182864Member 2025-08-31 0000751199 fmr:AAOptionsMember fmr:C000182864Member 2025-08-31 0000751199 fmr:AAAlternativeFundsMember fmr:C000182864Member 2025-08-31 0000751199 fmr:AAPreferredStocksMember fmr:C000182864Member 2025-08-31 0000751199 fmr:AAOtherInvestmentsMember fmr:C000182864Member 2025-08-31 0000751199 fmr:C000182864Member country:US 2025-08-31 0000751199 fmr:C000182864Member fmr:GrandCaymanUKOverseasTerMember 2025-08-31 0000751199 fmr:C000182864Member country:GB 2025-08-31 0000751199 fmr:C000182864Member country:MX 2025-08-31 0000751199 fmr:C000182864Member fmr:BailiwickOfJerseyMember 2025-08-31 0000751199 fmr:C000182864Member country:IE 2025-08-31 0000751199 fmr:C000182864Member country:DE 2025-08-31 0000751199 fmr:C000182864Member country:CA 2025-08-31 0000751199 fmr:C000182864Member country:CH 2025-08-31 0000751199 fmr:C000182864Member fmr:OtherMember 2025-08-31 0000751199 fmr:C000182864Member fmr:TH0Member 2025-08-31 0000751199 fmr:C000182864Member fmr:TH1Member 2025-08-31 0000751199 fmr:C000182864Member fmr:TH2Member 2025-08-31 0000751199 fmr:C000182864Member fmr:TH3Member 2025-08-31 0000751199 fmr:C000182864Member fmr:TH4Member 2025-08-31 0000751199 fmr:C000182864Member fmr:TH5Member 2025-08-31 0000751199 fmr:C000182864Member fmr:TH6Member 2025-08-31 0000751199 fmr:C000182864Member fmr:TH7Member 2025-08-31 0000751199 fmr:C000182864Member fmr:TH8Member 2025-08-31 0000751199 fmr:C000182864Member fmr:TH9Member 2025-08-31 0000751199 fmr:C000019272Member 2024-08-31 2025-08-31 0000751199 fmr:C000019272_LG_ClassMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000019272_ClassMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000019272_ClassMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000019272_ClassMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000019272_ClassMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000019272_ClassMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000019272_ClassMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000019272_ClassMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000019272_ClassMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000019272_ClassMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000019272_ClassMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000019272_ClassMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000019272_LG_1_AdditionalIndexMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000019272_1_AdditionalIndexMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000019272_1_AdditionalIndexMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000019272_1_AdditionalIndexMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000019272_1_AdditionalIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000019272_1_AdditionalIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000019272_1_AdditionalIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000019272_1_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000019272_1_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000019272_1_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000019272_1_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000019272_1_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000019272_NoLoadClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000019272_NoLoadClassMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000019272_NoLoadClassMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000019272_0_BBIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000019272_0_BBIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000019272_0_BBIndexMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000019272Member 2025-08-31 0000751199 fmr:C000019272Member fmr:QDUSGovernmentandUSGovernmentAgencyObligationsMember 2025-08-31 0000751199 fmr:C000019272Member fmr:QDAAAMember 2025-08-31 0000751199 fmr:C000019272Member fmr:QDAAMember 2025-08-31 0000751199 fmr:C000019272Member fmr:QDAMember 2025-08-31 0000751199 fmr:C000019272Member fmr:QDBBBMember 2025-08-31 0000751199 fmr:C000019272Member fmr:QDBBMember 2025-08-31 0000751199 fmr:C000019272Member fmr:QDBMember 2025-08-31 0000751199 fmr:C000019272Member fmr:QDCCCCCCMember 2025-08-31 0000751199 fmr:C000019272Member fmr:QDDMember 2025-08-31 0000751199 fmr:C000019272Member fmr:QDNotRatedMember 2025-08-31 0000751199 fmr:C000019272Member fmr:QDEquitiesMember 2025-08-31 0000751199 fmr:AAUSTreasuryObligationsMember fmr:C000019272Member 2025-08-31 0000751199 fmr:AACorporateBondsMember fmr:C000019272Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyMortgageSecuritiesMember fmr:C000019272Member 2025-08-31 0000751199 fmr:AAAssetBackedSecuritiesMember fmr:C000019272Member 2025-08-31 0000751199 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000019272Member 2025-08-31 0000751199 fmr:AABankLoanObligationsMember fmr:C000019272Member 2025-08-31 0000751199 fmr:AAForeignGovernmentandGovernmentAgencyObligationsMember fmr:C000019272Member 2025-08-31 0000751199 fmr:AAPreferredSecuritiesMember fmr:C000019272Member 2025-08-31 0000751199 fmr:AACommonStocksMember fmr:C000019272Member 2025-08-31 0000751199 fmr:AAOtherInvestmentsMember fmr:C000019272Member 2025-08-31 0000751199 fmr:AAOptionsMember fmr:C000019272Member 2025-08-31 0000751199 fmr:AAPreferredStocksMember fmr:C000019272Member 2025-08-31 0000751199 fmr:C000019272Member country:US 2025-08-31 0000751199 fmr:C000019272Member fmr:GrandCaymanUKOverseasTerMember 2025-08-31 0000751199 fmr:C000019272Member country:GB 2025-08-31 0000751199 fmr:C000019272Member country:MX 2025-08-31 0000751199 fmr:C000019272Member country:DE 2025-08-31 0000751199 fmr:C000019272Member country:IE 2025-08-31 0000751199 fmr:C000019272Member fmr:BailiwickOfJerseyMember 2025-08-31 0000751199 fmr:C000019272Member country:FR 2025-08-31 0000751199 fmr:C000019272Member country:CH 2025-08-31 0000751199 fmr:C000019272Member fmr:OtherMember 2025-08-31 0000751199 fmr:C000019272Member fmr:TH0Member 2025-08-31 0000751199 fmr:C000019272Member fmr:TH1Member 2025-08-31 0000751199 fmr:C000019272Member fmr:TH2Member 2025-08-31 0000751199 fmr:C000019272Member fmr:TH3Member 2025-08-31 0000751199 fmr:C000019272Member fmr:TH4Member 2025-08-31 0000751199 fmr:C000019272Member fmr:TH5Member 2025-08-31 0000751199 fmr:C000019272Member fmr:TH6Member 2025-08-31 0000751199 fmr:C000019272Member fmr:TH7Member 2025-08-31 0000751199 fmr:C000019272Member fmr:TH8Member 2025-08-31 0000751199 fmr:C000019272Member fmr:TH9Member 2025-08-31 0000751199 fmr:C000150510Member 2024-08-31 2025-08-31 0000751199 fmr:C000150510_LG_ClassMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000150510_ClassMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000150510_ClassMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000150510_ClassMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000150510_ClassMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000150510_ClassMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000150510_ClassMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000150510_ClassMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000150510_ClassMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000150510_ClassMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000150510_ClassMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000150510_ClassMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000150510_LG_1_AdditionalIndexMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000150510_1_AdditionalIndexMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000150510_1_AdditionalIndexMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000150510_1_AdditionalIndexMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000150510_1_AdditionalIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000150510_1_AdditionalIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000150510_1_AdditionalIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000150510_1_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000150510_1_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000150510_1_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000150510_1_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000150510_1_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000150510_NoLoadClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000150510_NoLoadClassMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000150510_NoLoadClassMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000150510_0_BBIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000150510_0_BBIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000150510_0_BBIndexMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000150510Member 2025-08-31 0000751199 fmr:C000150510Member fmr:QDUSGovernmentandUSGovernmentAgencyObligationsMember 2025-08-31 0000751199 fmr:C000150510Member fmr:QDAAAMember 2025-08-31 0000751199 fmr:C000150510Member fmr:QDAAMember 2025-08-31 0000751199 fmr:C000150510Member fmr:QDAMember 2025-08-31 0000751199 fmr:C000150510Member fmr:QDBBBMember 2025-08-31 0000751199 fmr:C000150510Member fmr:QDBBMember 2025-08-31 0000751199 fmr:C000150510Member fmr:QDBMember 2025-08-31 0000751199 fmr:C000150510Member fmr:QDCCCCCCMember 2025-08-31 0000751199 fmr:C000150510Member fmr:QDDMember 2025-08-31 0000751199 fmr:C000150510Member fmr:QDNotRatedMember 2025-08-31 0000751199 fmr:C000150510Member fmr:QDEquitiesMember 2025-08-31 0000751199 fmr:AAUSTreasuryObligationsMember fmr:C000150510Member 2025-08-31 0000751199 fmr:AACorporateBondsMember fmr:C000150510Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyMortgageSecuritiesMember fmr:C000150510Member 2025-08-31 0000751199 fmr:AAAssetBackedSecuritiesMember fmr:C000150510Member 2025-08-31 0000751199 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000150510Member 2025-08-31 0000751199 fmr:AABankLoanObligationsMember fmr:C000150510Member 2025-08-31 0000751199 fmr:AAForeignGovernmentandGovernmentAgencyObligationsMember fmr:C000150510Member 2025-08-31 0000751199 fmr:AAPreferredSecuritiesMember fmr:C000150510Member 2025-08-31 0000751199 fmr:AACommonStocksMember fmr:C000150510Member 2025-08-31 0000751199 fmr:AAOtherInvestmentsMember fmr:C000150510Member 2025-08-31 0000751199 fmr:AAOptionsMember fmr:C000150510Member 2025-08-31 0000751199 fmr:AAPreferredStocksMember fmr:C000150510Member 2025-08-31 0000751199 fmr:C000150510Member country:US 2025-08-31 0000751199 fmr:C000150510Member fmr:GrandCaymanUKOverseasTerMember 2025-08-31 0000751199 fmr:C000150510Member country:GB 2025-08-31 0000751199 fmr:C000150510Member country:MX 2025-08-31 0000751199 fmr:C000150510Member country:DE 2025-08-31 0000751199 fmr:C000150510Member country:IE 2025-08-31 0000751199 fmr:C000150510Member fmr:BailiwickOfJerseyMember 2025-08-31 0000751199 fmr:C000150510Member country:FR 2025-08-31 0000751199 fmr:C000150510Member country:CH 2025-08-31 0000751199 fmr:C000150510Member fmr:OtherMember 2025-08-31 0000751199 fmr:C000150510Member fmr:TH0Member 2025-08-31 0000751199 fmr:C000150510Member fmr:TH1Member 2025-08-31 0000751199 fmr:C000150510Member fmr:TH2Member 2025-08-31 0000751199 fmr:C000150510Member fmr:TH3Member 2025-08-31 0000751199 fmr:C000150510Member fmr:TH4Member 2025-08-31 0000751199 fmr:C000150510Member fmr:TH5Member 2025-08-31 0000751199 fmr:C000150510Member fmr:TH6Member 2025-08-31 0000751199 fmr:C000150510Member fmr:TH7Member 2025-08-31 0000751199 fmr:C000150510Member fmr:TH8Member 2025-08-31 0000751199 fmr:C000150510Member fmr:TH9Member 2025-08-31 0000751199 fmr:C000019276Member 2024-08-31 2025-08-31 0000751199 fmr:C000019276_LG_ClassMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000019276_ClassMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000019276_ClassMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000019276_ClassMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000019276_ClassMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000019276_ClassMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000019276_ClassMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000019276_ClassMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000019276_ClassMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000019276_ClassMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000019276_ClassMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000019276_ClassMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000019276_LG_1_AdditionalIndexMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000019276_1_AdditionalIndexMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000019276_1_AdditionalIndexMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000019276_1_AdditionalIndexMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000019276_1_AdditionalIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000019276_1_AdditionalIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000019276_1_AdditionalIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000019276_1_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000019276_1_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000019276_1_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000019276_1_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000019276_1_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000019276_ClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000019276_ClassMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000019276_ClassMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000019276_NoLoadClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000019276_NoLoadClassMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000019276_NoLoadClassMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000019276_0_BBIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000019276_0_BBIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000019276_0_BBIndexMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000019276Member 2025-08-31 0000751199 fmr:C000019276Member fmr:QDUSGovernmentandUSGovernmentAgencyObligationsMember 2025-08-31 0000751199 fmr:C000019276Member fmr:QDAAAMember 2025-08-31 0000751199 fmr:C000019276Member fmr:QDAAMember 2025-08-31 0000751199 fmr:C000019276Member fmr:QDAMember 2025-08-31 0000751199 fmr:C000019276Member fmr:QDBBBMember 2025-08-31 0000751199 fmr:C000019276Member fmr:QDBBMember 2025-08-31 0000751199 fmr:C000019276Member fmr:QDBMember 2025-08-31 0000751199 fmr:C000019276Member fmr:QDCCCCCCMember 2025-08-31 0000751199 fmr:C000019276Member fmr:QDDMember 2025-08-31 0000751199 fmr:C000019276Member fmr:QDNotRatedMember 2025-08-31 0000751199 fmr:C000019276Member fmr:QDEquitiesMember 2025-08-31 0000751199 fmr:AAUSTreasuryObligationsMember fmr:C000019276Member 2025-08-31 0000751199 fmr:AACorporateBondsMember fmr:C000019276Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyMortgageSecuritiesMember fmr:C000019276Member 2025-08-31 0000751199 fmr:AAAssetBackedSecuritiesMember fmr:C000019276Member 2025-08-31 0000751199 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000019276Member 2025-08-31 0000751199 fmr:AABankLoanObligationsMember fmr:C000019276Member 2025-08-31 0000751199 fmr:AAForeignGovernmentandGovernmentAgencyObligationsMember fmr:C000019276Member 2025-08-31 0000751199 fmr:AAPreferredSecuritiesMember fmr:C000019276Member 2025-08-31 0000751199 fmr:AACommonStocksMember fmr:C000019276Member 2025-08-31 0000751199 fmr:AAOtherInvestmentsMember fmr:C000019276Member 2025-08-31 0000751199 fmr:AAOptionsMember fmr:C000019276Member 2025-08-31 0000751199 fmr:AAPreferredStocksMember fmr:C000019276Member 2025-08-31 0000751199 fmr:C000019276Member country:US 2025-08-31 0000751199 fmr:C000019276Member fmr:GrandCaymanUKOverseasTerMember 2025-08-31 0000751199 fmr:C000019276Member country:GB 2025-08-31 0000751199 fmr:C000019276Member country:MX 2025-08-31 0000751199 fmr:C000019276Member country:DE 2025-08-31 0000751199 fmr:C000019276Member country:IE 2025-08-31 0000751199 fmr:C000019276Member fmr:BailiwickOfJerseyMember 2025-08-31 0000751199 fmr:C000019276Member country:FR 2025-08-31 0000751199 fmr:C000019276Member country:CH 2025-08-31 0000751199 fmr:C000019276Member fmr:OtherMember 2025-08-31 0000751199 fmr:C000019276Member fmr:TH0Member 2025-08-31 0000751199 fmr:C000019276Member fmr:TH1Member 2025-08-31 0000751199 fmr:C000019276Member fmr:TH2Member 2025-08-31 0000751199 fmr:C000019276Member fmr:TH3Member 2025-08-31 0000751199 fmr:C000019276Member fmr:TH4Member 2025-08-31 0000751199 fmr:C000019276Member fmr:TH5Member 2025-08-31 0000751199 fmr:C000019276Member fmr:TH6Member 2025-08-31 0000751199 fmr:C000019276Member fmr:TH7Member 2025-08-31 0000751199 fmr:C000019276Member fmr:TH8Member 2025-08-31 0000751199 fmr:C000019276Member fmr:TH9Member 2025-08-31 0000751199 fmr:C000019277Member 2024-08-31 2025-08-31 0000751199 fmr:C000019277_LG_ClassMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000019277_ClassMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000019277_ClassMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000019277_ClassMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000019277_ClassMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000019277_ClassMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000019277_ClassMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000019277_ClassMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000019277_ClassMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000019277_ClassMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000019277_ClassMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000019277_ClassMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000019277_LG_1_AdditionalIndexMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000019277_1_AdditionalIndexMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000019277_1_AdditionalIndexMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000019277_1_AdditionalIndexMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000019277_1_AdditionalIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000019277_1_AdditionalIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000019277_1_AdditionalIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000019277_1_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000019277_1_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000019277_1_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000019277_1_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000019277_1_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000019277_NoLoadClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000019277_NoLoadClassMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000019277_NoLoadClassMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000019277_0_BBIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000019277_0_BBIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000019277_0_BBIndexMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000019277Member 2025-08-31 0000751199 fmr:C000019277Member fmr:QDUSGovernmentandUSGovernmentAgencyObligationsMember 2025-08-31 0000751199 fmr:C000019277Member fmr:QDAAAMember 2025-08-31 0000751199 fmr:C000019277Member fmr:QDAAMember 2025-08-31 0000751199 fmr:C000019277Member fmr:QDAMember 2025-08-31 0000751199 fmr:C000019277Member fmr:QDBBBMember 2025-08-31 0000751199 fmr:C000019277Member fmr:QDBBMember 2025-08-31 0000751199 fmr:C000019277Member fmr:QDBMember 2025-08-31 0000751199 fmr:C000019277Member fmr:QDCCCCCCMember 2025-08-31 0000751199 fmr:C000019277Member fmr:QDDMember 2025-08-31 0000751199 fmr:C000019277Member fmr:QDNotRatedMember 2025-08-31 0000751199 fmr:C000019277Member fmr:QDEquitiesMember 2025-08-31 0000751199 fmr:AAUSTreasuryObligationsMember fmr:C000019277Member 2025-08-31 0000751199 fmr:AACorporateBondsMember fmr:C000019277Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyMortgageSecuritiesMember fmr:C000019277Member 2025-08-31 0000751199 fmr:AAAssetBackedSecuritiesMember fmr:C000019277Member 2025-08-31 0000751199 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000019277Member 2025-08-31 0000751199 fmr:AABankLoanObligationsMember fmr:C000019277Member 2025-08-31 0000751199 fmr:AAForeignGovernmentandGovernmentAgencyObligationsMember fmr:C000019277Member 2025-08-31 0000751199 fmr:AAPreferredSecuritiesMember fmr:C000019277Member 2025-08-31 0000751199 fmr:AACommonStocksMember fmr:C000019277Member 2025-08-31 0000751199 fmr:AAOtherInvestmentsMember fmr:C000019277Member 2025-08-31 0000751199 fmr:AAOptionsMember fmr:C000019277Member 2025-08-31 0000751199 fmr:AAPreferredStocksMember fmr:C000019277Member 2025-08-31 0000751199 fmr:C000019277Member country:US 2025-08-31 0000751199 fmr:C000019277Member fmr:GrandCaymanUKOverseasTerMember 2025-08-31 0000751199 fmr:C000019277Member country:GB 2025-08-31 0000751199 fmr:C000019277Member country:MX 2025-08-31 0000751199 fmr:C000019277Member country:DE 2025-08-31 0000751199 fmr:C000019277Member country:IE 2025-08-31 0000751199 fmr:C000019277Member fmr:BailiwickOfJerseyMember 2025-08-31 0000751199 fmr:C000019277Member country:FR 2025-08-31 0000751199 fmr:C000019277Member country:CH 2025-08-31 0000751199 fmr:C000019277Member fmr:OtherMember 2025-08-31 0000751199 fmr:C000019277Member fmr:TH0Member 2025-08-31 0000751199 fmr:C000019277Member fmr:TH1Member 2025-08-31 0000751199 fmr:C000019277Member fmr:TH2Member 2025-08-31 0000751199 fmr:C000019277Member fmr:TH3Member 2025-08-31 0000751199 fmr:C000019277Member fmr:TH4Member 2025-08-31 0000751199 fmr:C000019277Member fmr:TH5Member 2025-08-31 0000751199 fmr:C000019277Member fmr:TH6Member 2025-08-31 0000751199 fmr:C000019277Member fmr:TH7Member 2025-08-31 0000751199 fmr:C000019277Member fmr:TH8Member 2025-08-31 0000751199 fmr:C000019277Member fmr:TH9Member 2025-08-31 0000751199 fmr:C000019275Member 2024-08-31 2025-08-31 0000751199 fmr:C000019275_LG_ClassMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000019275_ClassMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000019275_ClassMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000019275_ClassMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000019275_ClassMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000019275_ClassMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000019275_ClassMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000019275_ClassMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000019275_ClassMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000019275_ClassMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000019275_ClassMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000019275_ClassMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000019275_LG_1_AdditionalIndexMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000019275_1_AdditionalIndexMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000019275_1_AdditionalIndexMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000019275_1_AdditionalIndexMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000019275_1_AdditionalIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000019275_1_AdditionalIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000019275_1_AdditionalIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000019275_1_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000019275_1_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000019275_1_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000019275_1_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000019275_1_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000019275_ClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000019275_ClassMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000019275_ClassMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000019275_NoLoadClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000019275_NoLoadClassMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000019275_NoLoadClassMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000019275_0_BBIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000019275_0_BBIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000019275_0_BBIndexMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000019275Member 2025-08-31 0000751199 fmr:C000019275Member fmr:QDUSGovernmentandUSGovernmentAgencyObligationsMember 2025-08-31 0000751199 fmr:C000019275Member fmr:QDAAAMember 2025-08-31 0000751199 fmr:C000019275Member fmr:QDAAMember 2025-08-31 0000751199 fmr:C000019275Member fmr:QDAMember 2025-08-31 0000751199 fmr:C000019275Member fmr:QDBBBMember 2025-08-31 0000751199 fmr:C000019275Member fmr:QDBBMember 2025-08-31 0000751199 fmr:C000019275Member fmr:QDBMember 2025-08-31 0000751199 fmr:C000019275Member fmr:QDCCCCCCMember 2025-08-31 0000751199 fmr:C000019275Member fmr:QDDMember 2025-08-31 0000751199 fmr:C000019275Member fmr:QDNotRatedMember 2025-08-31 0000751199 fmr:C000019275Member fmr:QDEquitiesMember 2025-08-31 0000751199 fmr:AAUSTreasuryObligationsMember fmr:C000019275Member 2025-08-31 0000751199 fmr:AACorporateBondsMember fmr:C000019275Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyMortgageSecuritiesMember fmr:C000019275Member 2025-08-31 0000751199 fmr:AAAssetBackedSecuritiesMember fmr:C000019275Member 2025-08-31 0000751199 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000019275Member 2025-08-31 0000751199 fmr:AABankLoanObligationsMember fmr:C000019275Member 2025-08-31 0000751199 fmr:AAForeignGovernmentandGovernmentAgencyObligationsMember fmr:C000019275Member 2025-08-31 0000751199 fmr:AAPreferredSecuritiesMember fmr:C000019275Member 2025-08-31 0000751199 fmr:AACommonStocksMember fmr:C000019275Member 2025-08-31 0000751199 fmr:AAOtherInvestmentsMember fmr:C000019275Member 2025-08-31 0000751199 fmr:AAOptionsMember fmr:C000019275Member 2025-08-31 0000751199 fmr:AAPreferredStocksMember fmr:C000019275Member 2025-08-31 0000751199 fmr:C000019275Member country:US 2025-08-31 0000751199 fmr:C000019275Member fmr:GrandCaymanUKOverseasTerMember 2025-08-31 0000751199 fmr:C000019275Member country:GB 2025-08-31 0000751199 fmr:C000019275Member country:MX 2025-08-31 0000751199 fmr:C000019275Member country:DE 2025-08-31 0000751199 fmr:C000019275Member country:IE 2025-08-31 0000751199 fmr:C000019275Member fmr:BailiwickOfJerseyMember 2025-08-31 0000751199 fmr:C000019275Member country:FR 2025-08-31 0000751199 fmr:C000019275Member country:CH 2025-08-31 0000751199 fmr:C000019275Member fmr:OtherMember 2025-08-31 0000751199 fmr:C000019275Member fmr:TH0Member 2025-08-31 0000751199 fmr:C000019275Member fmr:TH1Member 2025-08-31 0000751199 fmr:C000019275Member fmr:TH2Member 2025-08-31 0000751199 fmr:C000019275Member fmr:TH3Member 2025-08-31 0000751199 fmr:C000019275Member fmr:TH4Member 2025-08-31 0000751199 fmr:C000019275Member fmr:TH5Member 2025-08-31 0000751199 fmr:C000019275Member fmr:TH6Member 2025-08-31 0000751199 fmr:C000019275Member fmr:TH7Member 2025-08-31 0000751199 fmr:C000019275Member fmr:TH8Member 2025-08-31 0000751199 fmr:C000019275Member fmr:TH9Member 2025-08-31 0000751199 fmr:C000019273Member 2024-08-31 2025-08-31 0000751199 fmr:C000019273_LG_ClassMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000019273_ClassMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000019273_ClassMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000019273_ClassMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000019273_ClassMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000019273_ClassMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000019273_ClassMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000019273_ClassMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000019273_ClassMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000019273_ClassMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000019273_ClassMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000019273_ClassMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000019273_LG_1_AdditionalIndexMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000019273_1_AdditionalIndexMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000019273_1_AdditionalIndexMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000019273_1_AdditionalIndexMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000019273_1_AdditionalIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000019273_1_AdditionalIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000019273_1_AdditionalIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000019273_1_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000019273_1_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000019273_1_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000019273_1_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000019273_1_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000019273_ClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000019273_ClassMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000019273_ClassMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000019273_NoLoadClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000019273_NoLoadClassMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000019273_NoLoadClassMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000019273_0_BBIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000019273_0_BBIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000019273_0_BBIndexMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000019273Member 2025-08-31 0000751199 fmr:C000019273Member fmr:QDUSGovernmentandUSGovernmentAgencyObligationsMember 2025-08-31 0000751199 fmr:C000019273Member fmr:QDAAAMember 2025-08-31 0000751199 fmr:C000019273Member fmr:QDAAMember 2025-08-31 0000751199 fmr:C000019273Member fmr:QDAMember 2025-08-31 0000751199 fmr:C000019273Member fmr:QDBBBMember 2025-08-31 0000751199 fmr:C000019273Member fmr:QDBBMember 2025-08-31 0000751199 fmr:C000019273Member fmr:QDBMember 2025-08-31 0000751199 fmr:C000019273Member fmr:QDCCCCCCMember 2025-08-31 0000751199 fmr:C000019273Member fmr:QDDMember 2025-08-31 0000751199 fmr:C000019273Member fmr:QDNotRatedMember 2025-08-31 0000751199 fmr:C000019273Member fmr:QDEquitiesMember 2025-08-31 0000751199 fmr:AAUSTreasuryObligationsMember fmr:C000019273Member 2025-08-31 0000751199 fmr:AACorporateBondsMember fmr:C000019273Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyMortgageSecuritiesMember fmr:C000019273Member 2025-08-31 0000751199 fmr:AAAssetBackedSecuritiesMember fmr:C000019273Member 2025-08-31 0000751199 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000019273Member 2025-08-31 0000751199 fmr:AABankLoanObligationsMember fmr:C000019273Member 2025-08-31 0000751199 fmr:AAForeignGovernmentandGovernmentAgencyObligationsMember fmr:C000019273Member 2025-08-31 0000751199 fmr:AAPreferredSecuritiesMember fmr:C000019273Member 2025-08-31 0000751199 fmr:AACommonStocksMember fmr:C000019273Member 2025-08-31 0000751199 fmr:AAOtherInvestmentsMember fmr:C000019273Member 2025-08-31 0000751199 fmr:AAOptionsMember fmr:C000019273Member 2025-08-31 0000751199 fmr:AAPreferredStocksMember fmr:C000019273Member 2025-08-31 0000751199 fmr:C000019273Member country:US 2025-08-31 0000751199 fmr:C000019273Member fmr:GrandCaymanUKOverseasTerMember 2025-08-31 0000751199 fmr:C000019273Member country:GB 2025-08-31 0000751199 fmr:C000019273Member country:MX 2025-08-31 0000751199 fmr:C000019273Member country:DE 2025-08-31 0000751199 fmr:C000019273Member country:IE 2025-08-31 0000751199 fmr:C000019273Member fmr:BailiwickOfJerseyMember 2025-08-31 0000751199 fmr:C000019273Member country:FR 2025-08-31 0000751199 fmr:C000019273Member country:CH 2025-08-31 0000751199 fmr:C000019273Member fmr:OtherMember 2025-08-31 0000751199 fmr:C000019273Member fmr:TH0Member 2025-08-31 0000751199 fmr:C000019273Member fmr:TH1Member 2025-08-31 0000751199 fmr:C000019273Member fmr:TH2Member 2025-08-31 0000751199 fmr:C000019273Member fmr:TH3Member 2025-08-31 0000751199 fmr:C000019273Member fmr:TH4Member 2025-08-31 0000751199 fmr:C000019273Member fmr:TH5Member 2025-08-31 0000751199 fmr:C000019273Member fmr:TH6Member 2025-08-31 0000751199 fmr:C000019273Member fmr:TH7Member 2025-08-31 0000751199 fmr:C000019273Member fmr:TH8Member 2025-08-31 0000751199 fmr:C000019273Member fmr:TH9Member 2025-08-31 0000751199 fmr:C000203458Member 2024-08-31 2025-08-31 0000751199 fmr:C000203458_LG_ClassMember_8YRMember 2017-08-31 2025-08-31 0000751199 fmr:C000203458_ClassMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000203458_ClassMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000203458_ClassMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000203458_ClassMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000203458_ClassMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000203458_ClassMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000203458_ClassMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000203458_ClassMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000203458_LG_1_AdditionalIndexMember_8YRMember 2017-08-31 2025-08-31 0000751199 fmr:C000203458_1_AdditionalIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000203458_1_AdditionalIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000203458_1_AdditionalIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000203458_1_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000203458_1_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000203458_1_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000203458_1_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000203458_1_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000203458_LG_2_AdditionalIndexMember_8YRMember 2017-08-31 2025-08-31 0000751199 fmr:C000203458_2_AdditionalIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000203458_2_AdditionalIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000203458_2_AdditionalIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000203458_2_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000203458_2_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000203458_2_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000203458_2_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000203458_2_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000203458_NoLoadClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000203458_NoLoadClassMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000203458_NoLoadClassMember_2024-09-01_2025-08-31Member 2024-08-31 2025-08-31 0000751199 fmr:C000203458_0_AdditionalIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000203458_0_AdditionalIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000203458_0_AdditionalIndexMember_LOCMember 2024-08-31 2025-08-31 0000751199 fmr:C000203458_1_BBIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000203458_1_BBIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000203458_1_BBIndexMember_LOCMember 2024-08-31 2025-08-31 0000751199 fmr:C000203458Member 2018-08-17 2025-08-31 0000751199 fmr:C000203458Member 2025-08-31 0000751199 fmr:C000203458Member fmr:CD0Member 2025-08-31 0000751199 fmr:C000203458Member fmr:CD1Member 2025-08-31 0000751199 fmr:C000203458Member fmr:CD2Member 2025-08-31 0000751199 fmr:C000203458Member fmr:CD3Member 2025-08-31 0000751199 fmr:C000203458Member fmr:CD4Member 2025-08-31 0000751199 fmr:C000203458Member fmr:CD5Member 2025-08-31 0000751199 fmr:C000203458Member fmr:CD6Member 2025-08-31 0000751199 fmr:C000203458Member fmr:CD7Member 2025-08-31 0000751199 fmr:AAUSTreasuryObligationsMember fmr:C000203458Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyObligationsMember fmr:C000203458Member 2025-08-31 0000751199 fmr:AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember fmr:C000203458Member 2025-08-31 0000751199 fmr:C000203458Member fmr:TH0Member 2025-08-31 0000751199 fmr:C000203458Member fmr:TH1Member 2025-08-31 0000751199 fmr:C000203458Member fmr:TH2Member 2025-08-31 0000751199 fmr:C000203458Member fmr:TH3Member 2025-08-31 0000751199 fmr:C000203458Member fmr:TH4Member 2025-08-31 0000751199 fmr:C000203458Member fmr:TH5Member 2025-08-31 0000751199 fmr:C000203458Member fmr:TH6Member 2025-08-31 0000751199 fmr:C000019284Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_LG_ClassMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000019284_ClassMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_ClassMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_ClassMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_ClassMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_ClassMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_ClassMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_ClassMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_ClassMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_ClassMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_ClassMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_ClassMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_LG_1_AdditionalIndexMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000019284_1_AdditionalIndexMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_1_AdditionalIndexMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_1_AdditionalIndexMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_1_AdditionalIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_1_AdditionalIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_1_AdditionalIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_1_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_1_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_1_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_1_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_1_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_LG_2_AdditionalIndexMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000019284_2_AdditionalIndexMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_2_AdditionalIndexMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_2_AdditionalIndexMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_2_AdditionalIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_2_AdditionalIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_2_AdditionalIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_2_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_2_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_2_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_2_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_2_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000019284_NoLoadClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000019284_NoLoadClassMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000019284_NoLoadClassMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000019284_0_AdditionalIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000019284_0_AdditionalIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000019284_0_AdditionalIndexMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000019284_1_BBIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000019284_1_BBIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000019284_1_BBIndexMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000019284Member 2025-08-31 0000751199 fmr:C000019284Member fmr:CD0Member 2025-08-31 0000751199 fmr:C000019284Member fmr:CD1Member 2025-08-31 0000751199 fmr:C000019284Member fmr:CD2Member 2025-08-31 0000751199 fmr:C000019284Member fmr:CD3Member 2025-08-31 0000751199 fmr:C000019284Member fmr:CD4Member 2025-08-31 0000751199 fmr:C000019284Member fmr:CD5Member 2025-08-31 0000751199 fmr:C000019284Member fmr:CD6Member 2025-08-31 0000751199 fmr:AAUSTreasuryObligationsMember fmr:C000019284Member 2025-08-31 0000751199 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000019284Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyMortgageSecuritiesMember fmr:C000019284Member 2025-08-31 0000751199 fmr:AAOptionsMember fmr:C000019284Member 2025-08-31 0000751199 fmr:AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember fmr:C000019284Member 2025-08-31 0000751199 fmr:C000019284Member fmr:TH0Member 2025-08-31 0000751199 fmr:C000019284Member fmr:TH1Member 2025-08-31 0000751199 fmr:C000019284Member fmr:TH2Member 2025-08-31 0000751199 fmr:C000019284Member fmr:TH3Member 2025-08-31 0000751199 fmr:C000019284Member fmr:TH4Member 2025-08-31 0000751199 fmr:C000019284Member fmr:TH5Member 2025-08-31 0000751199 fmr:C000019284Member fmr:TH6Member 2025-08-31 0000751199 fmr:C000019284Member fmr:TH7Member 2025-08-31 0000751199 fmr:C000019284Member fmr:TH8Member 2025-08-31 0000751199 fmr:C000019284Member fmr:TH9Member 2025-08-31 0000751199 fmr:C000019283Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_LG_ClassMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000019283_ClassMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_ClassMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_ClassMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_ClassMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_ClassMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_ClassMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_ClassMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_ClassMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_ClassMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_ClassMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_ClassMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_LG_1_AdditionalIndexMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000019283_1_AdditionalIndexMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_1_AdditionalIndexMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_1_AdditionalIndexMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_1_AdditionalIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_1_AdditionalIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_1_AdditionalIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_1_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_1_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_1_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_1_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_1_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_LG_2_AdditionalIndexMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000019283_2_AdditionalIndexMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_2_AdditionalIndexMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_2_AdditionalIndexMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_2_AdditionalIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_2_AdditionalIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_2_AdditionalIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_2_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_2_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_2_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_2_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_2_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_0_LG_BBIndexMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000019283_0_BBIndexMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_0_BBIndexMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_0_BBIndexMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_0_BBIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_0_BBIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_0_BBIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_0_BBIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_0_BBIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_0_BBIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_0_BBIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_0_BBIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000019283_NoLoadClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000019283_NoLoadClassMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000019283_NoLoadClassMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000019283_0_AdditionalIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000019283_0_AdditionalIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000019283_0_AdditionalIndexMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000019283_1_AdditionalIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000019283_1_AdditionalIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000019283_1_AdditionalIndexMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000019283_2_BBIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000019283_2_BBIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000019283_2_BBIndexMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000019283Member 2025-08-31 0000751199 fmr:C000019283Member fmr:CD0Member 2025-08-31 0000751199 fmr:C000019283Member fmr:CD1Member 2025-08-31 0000751199 fmr:C000019283Member fmr:CD2Member 2025-08-31 0000751199 fmr:C000019283Member fmr:CD3Member 2025-08-31 0000751199 fmr:C000019283Member fmr:CD4Member 2025-08-31 0000751199 fmr:C000019283Member fmr:CD5Member 2025-08-31 0000751199 fmr:C000019283Member fmr:CD6Member 2025-08-31 0000751199 fmr:C000019283Member fmr:CD7Member 2025-08-31 0000751199 fmr:C000019283Member fmr:CD8Member 2025-08-31 0000751199 fmr:C000019283Member fmr:CD9Member 2025-08-31 0000751199 fmr:C000019283Member fmr:CD10Member 2025-08-31 0000751199 fmr:AAUSTreasuryObligationsMember fmr:C000019283Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyMortgageSecuritiesMember fmr:C000019283Member 2025-08-31 0000751199 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000019283Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyObligationsMember fmr:C000019283Member 2025-08-31 0000751199 fmr:AAOptionsMember fmr:C000019283Member 2025-08-31 0000751199 fmr:AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember fmr:C000019283Member 2025-08-31 0000751199 fmr:C000019283Member fmr:TH0Member 2025-08-31 0000751199 fmr:C000019283Member fmr:TH1Member 2025-08-31 0000751199 fmr:C000019283Member fmr:TH2Member 2025-08-31 0000751199 fmr:C000019283Member fmr:TH3Member 2025-08-31 0000751199 fmr:C000019283Member fmr:TH4Member 2025-08-31 0000751199 fmr:C000019283Member fmr:TH5Member 2025-08-31 0000751199 fmr:C000019283Member fmr:TH6Member 2025-08-31 0000751199 fmr:C000019283Member fmr:TH7Member 2025-08-31 0000751199 fmr:C000019283Member fmr:TH8Member 2025-08-31 0000751199 fmr:C000019283Member fmr:TH9Member 2025-08-31 0000751199 fmr:C000205069Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_LG_ClassMember_8YRMember 2017-08-31 2025-08-31 0000751199 fmr:C000205069_ClassMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_ClassMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_ClassMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_ClassMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_ClassMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_ClassMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_ClassMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_ClassMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_LG_1_AdditionalIndexMember_8YRMember 2017-08-31 2025-08-31 0000751199 fmr:C000205069_1_AdditionalIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_1_AdditionalIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_1_AdditionalIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_1_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_1_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_1_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_1_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_1_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_LG_2_AdditionalIndexMember_8YRMember 2017-08-31 2025-08-31 0000751199 fmr:C000205069_2_AdditionalIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_2_AdditionalIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_2_AdditionalIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_2_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_2_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_2_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_2_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_2_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_0_LG_BBIndexMember_8YRMember 2017-08-31 2025-08-31 0000751199 fmr:C000205069_0_BBIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_0_BBIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_0_BBIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_0_BBIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_0_BBIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_0_BBIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_0_BBIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_0_BBIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_NoLoadClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000205069_NoLoadClassMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000205069_NoLoadClassMember_2024-09-01_2025-08-31Member 2024-08-31 2025-08-31 0000751199 fmr:C000205069_0_AdditionalIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000205069_0_AdditionalIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000205069_0_AdditionalIndexMember_LOCMember 2024-08-31 2025-08-31 0000751199 fmr:C000205069_1_AdditionalIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000205069_1_AdditionalIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000205069_1_AdditionalIndexMember_LOCMember 2024-08-31 2025-08-31 0000751199 fmr:C000205069_2_BBIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000205069_2_BBIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000205069_2_BBIndexMember_LOCMember 2024-08-31 2025-08-31 0000751199 fmr:C000205069Member 2018-10-02 2025-08-31 0000751199 fmr:C000205069Member 2025-08-31 0000751199 fmr:C000205069Member fmr:CD0Member 2025-08-31 0000751199 fmr:C000205069Member fmr:CD1Member 2025-08-31 0000751199 fmr:C000205069Member fmr:CD2Member 2025-08-31 0000751199 fmr:C000205069Member fmr:CD3Member 2025-08-31 0000751199 fmr:C000205069Member fmr:CD4Member 2025-08-31 0000751199 fmr:C000205069Member fmr:CD5Member 2025-08-31 0000751199 fmr:C000205069Member fmr:CD6Member 2025-08-31 0000751199 fmr:C000205069Member fmr:CD7Member 2025-08-31 0000751199 fmr:C000205069Member fmr:CD8Member 2025-08-31 0000751199 fmr:C000205069Member fmr:CD9Member 2025-08-31 0000751199 fmr:C000205069Member fmr:CD10Member 2025-08-31 0000751199 fmr:AAUSTreasuryObligationsMember fmr:C000205069Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyMortgageSecuritiesMember fmr:C000205069Member 2025-08-31 0000751199 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000205069Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyObligationsMember fmr:C000205069Member 2025-08-31 0000751199 fmr:AAOptionsMember fmr:C000205069Member 2025-08-31 0000751199 fmr:AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember fmr:C000205069Member 2025-08-31 0000751199 fmr:C000205069Member fmr:TH0Member 2025-08-31 0000751199 fmr:C000205069Member fmr:TH1Member 2025-08-31 0000751199 fmr:C000205069Member fmr:TH2Member 2025-08-31 0000751199 fmr:C000205069Member fmr:TH3Member 2025-08-31 0000751199 fmr:C000205069Member fmr:TH4Member 2025-08-31 0000751199 fmr:C000205069Member fmr:TH5Member 2025-08-31 0000751199 fmr:C000205069Member fmr:TH6Member 2025-08-31 0000751199 fmr:C000205069Member fmr:TH7Member 2025-08-31 0000751199 fmr:C000205069Member fmr:TH8Member 2025-08-31 0000751199 fmr:C000205069Member fmr:TH9Member 2025-08-31 0000751199 fmr:C000038101Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_LG_ClassMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000038101_ClassMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_ClassMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_ClassMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_ClassMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_ClassMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_ClassMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_ClassMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_ClassMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_ClassMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_ClassMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_ClassMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_LG_1_AdditionalIndexMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000038101_1_AdditionalIndexMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_1_AdditionalIndexMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_1_AdditionalIndexMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_1_AdditionalIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_1_AdditionalIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_1_AdditionalIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_1_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_1_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_1_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_1_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_1_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_LG_2_AdditionalIndexMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000038101_2_AdditionalIndexMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_2_AdditionalIndexMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_2_AdditionalIndexMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_2_AdditionalIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_2_AdditionalIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_2_AdditionalIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_2_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_2_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_2_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_2_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_2_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_0_LG_BBIndexMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000038101_0_BBIndexMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_0_BBIndexMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_0_BBIndexMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_0_BBIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_0_BBIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_0_BBIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_0_BBIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_0_BBIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_0_BBIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_0_BBIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_0_BBIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000038101_ClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000038101_ClassMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000038101_ClassMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000038101_NoLoadClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000038101_NoLoadClassMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000038101_NoLoadClassMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000038101_0_AdditionalIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000038101_0_AdditionalIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000038101_0_AdditionalIndexMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000038101_1_AdditionalIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000038101_1_AdditionalIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000038101_1_AdditionalIndexMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000038101_2_BBIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000038101_2_BBIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000038101_2_BBIndexMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000038101Member 2025-08-31 0000751199 fmr:C000038101Member fmr:CD0Member 2025-08-31 0000751199 fmr:C000038101Member fmr:CD1Member 2025-08-31 0000751199 fmr:C000038101Member fmr:CD2Member 2025-08-31 0000751199 fmr:C000038101Member fmr:CD3Member 2025-08-31 0000751199 fmr:C000038101Member fmr:CD4Member 2025-08-31 0000751199 fmr:C000038101Member fmr:CD5Member 2025-08-31 0000751199 fmr:C000038101Member fmr:CD6Member 2025-08-31 0000751199 fmr:C000038101Member fmr:CD7Member 2025-08-31 0000751199 fmr:C000038101Member fmr:CD8Member 2025-08-31 0000751199 fmr:C000038101Member fmr:CD9Member 2025-08-31 0000751199 fmr:C000038101Member fmr:CD10Member 2025-08-31 0000751199 fmr:AAUSTreasuryObligationsMember fmr:C000038101Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyMortgageSecuritiesMember fmr:C000038101Member 2025-08-31 0000751199 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000038101Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyObligationsMember fmr:C000038101Member 2025-08-31 0000751199 fmr:AAOptionsMember fmr:C000038101Member 2025-08-31 0000751199 fmr:AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember fmr:C000038101Member 2025-08-31 0000751199 fmr:C000038101Member fmr:TH0Member 2025-08-31 0000751199 fmr:C000038101Member fmr:TH1Member 2025-08-31 0000751199 fmr:C000038101Member fmr:TH2Member 2025-08-31 0000751199 fmr:C000038101Member fmr:TH3Member 2025-08-31 0000751199 fmr:C000038101Member fmr:TH4Member 2025-08-31 0000751199 fmr:C000038101Member fmr:TH5Member 2025-08-31 0000751199 fmr:C000038101Member fmr:TH6Member 2025-08-31 0000751199 fmr:C000038101Member fmr:TH7Member 2025-08-31 0000751199 fmr:C000038101Member fmr:TH8Member 2025-08-31 0000751199 fmr:C000038101Member fmr:TH9Member 2025-08-31 0000751199 fmr:C000038102Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_LG_ClassMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000038102_ClassMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_ClassMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_ClassMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_ClassMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_ClassMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_ClassMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_ClassMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_ClassMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_ClassMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_ClassMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_ClassMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_LG_1_AdditionalIndexMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000038102_1_AdditionalIndexMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_1_AdditionalIndexMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_1_AdditionalIndexMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_1_AdditionalIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_1_AdditionalIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_1_AdditionalIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_1_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_1_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_1_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_1_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_1_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_LG_2_AdditionalIndexMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000038102_2_AdditionalIndexMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_2_AdditionalIndexMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_2_AdditionalIndexMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_2_AdditionalIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_2_AdditionalIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_2_AdditionalIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_2_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_2_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_2_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_2_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_2_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_0_LG_BBIndexMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000038102_0_BBIndexMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_0_BBIndexMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_0_BBIndexMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_0_BBIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_0_BBIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_0_BBIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_0_BBIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_0_BBIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_0_BBIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_0_BBIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_0_BBIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000038102_NoLoadClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000038102_NoLoadClassMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000038102_NoLoadClassMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000038102_0_AdditionalIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000038102_0_AdditionalIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000038102_0_AdditionalIndexMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000038102_1_AdditionalIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000038102_1_AdditionalIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000038102_1_AdditionalIndexMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000038102_2_BBIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000038102_2_BBIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000038102_2_BBIndexMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000038102Member 2025-08-31 0000751199 fmr:C000038102Member fmr:CD0Member 2025-08-31 0000751199 fmr:C000038102Member fmr:CD1Member 2025-08-31 0000751199 fmr:C000038102Member fmr:CD2Member 2025-08-31 0000751199 fmr:C000038102Member fmr:CD3Member 2025-08-31 0000751199 fmr:C000038102Member fmr:CD4Member 2025-08-31 0000751199 fmr:C000038102Member fmr:CD5Member 2025-08-31 0000751199 fmr:C000038102Member fmr:CD6Member 2025-08-31 0000751199 fmr:C000038102Member fmr:CD7Member 2025-08-31 0000751199 fmr:C000038102Member fmr:CD8Member 2025-08-31 0000751199 fmr:C000038102Member fmr:CD9Member 2025-08-31 0000751199 fmr:C000038102Member fmr:CD10Member 2025-08-31 0000751199 fmr:AAUSTreasuryObligationsMember fmr:C000038102Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyMortgageSecuritiesMember fmr:C000038102Member 2025-08-31 0000751199 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000038102Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyObligationsMember fmr:C000038102Member 2025-08-31 0000751199 fmr:AAOptionsMember fmr:C000038102Member 2025-08-31 0000751199 fmr:AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember fmr:C000038102Member 2025-08-31 0000751199 fmr:C000038102Member fmr:TH0Member 2025-08-31 0000751199 fmr:C000038102Member fmr:TH1Member 2025-08-31 0000751199 fmr:C000038102Member fmr:TH2Member 2025-08-31 0000751199 fmr:C000038102Member fmr:TH3Member 2025-08-31 0000751199 fmr:C000038102Member fmr:TH4Member 2025-08-31 0000751199 fmr:C000038102Member fmr:TH5Member 2025-08-31 0000751199 fmr:C000038102Member fmr:TH6Member 2025-08-31 0000751199 fmr:C000038102Member fmr:TH7Member 2025-08-31 0000751199 fmr:C000038102Member fmr:TH8Member 2025-08-31 0000751199 fmr:C000038102Member fmr:TH9Member 2025-08-31 0000751199 fmr:C000038100Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_LG_ClassMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000038100_ClassMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_ClassMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_ClassMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_ClassMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_ClassMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_ClassMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_ClassMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_ClassMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_ClassMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_ClassMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_ClassMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_LG_1_AdditionalIndexMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000038100_1_AdditionalIndexMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_1_AdditionalIndexMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_1_AdditionalIndexMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_1_AdditionalIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_1_AdditionalIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_1_AdditionalIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_1_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_1_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_1_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_1_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_1_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_LG_2_AdditionalIndexMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000038100_2_AdditionalIndexMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_2_AdditionalIndexMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_2_AdditionalIndexMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_2_AdditionalIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_2_AdditionalIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_2_AdditionalIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_2_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_2_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_2_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_2_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_2_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_0_LG_BBIndexMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000038100_0_BBIndexMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_0_BBIndexMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_0_BBIndexMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_0_BBIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_0_BBIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_0_BBIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_0_BBIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_0_BBIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_0_BBIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_0_BBIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_0_BBIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000038100_ClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000038100_ClassMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000038100_ClassMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000038100_NoLoadClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000038100_NoLoadClassMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000038100_NoLoadClassMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000038100_0_AdditionalIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000038100_0_AdditionalIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000038100_0_AdditionalIndexMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000038100_1_AdditionalIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000038100_1_AdditionalIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000038100_1_AdditionalIndexMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000038100_2_BBIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000038100_2_BBIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000038100_2_BBIndexMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000038100Member 2025-08-31 0000751199 fmr:C000038100Member fmr:CD0Member 2025-08-31 0000751199 fmr:C000038100Member fmr:CD1Member 2025-08-31 0000751199 fmr:C000038100Member fmr:CD2Member 2025-08-31 0000751199 fmr:C000038100Member fmr:CD3Member 2025-08-31 0000751199 fmr:C000038100Member fmr:CD4Member 2025-08-31 0000751199 fmr:C000038100Member fmr:CD5Member 2025-08-31 0000751199 fmr:C000038100Member fmr:CD6Member 2025-08-31 0000751199 fmr:C000038100Member fmr:CD7Member 2025-08-31 0000751199 fmr:C000038100Member fmr:CD8Member 2025-08-31 0000751199 fmr:C000038100Member fmr:CD9Member 2025-08-31 0000751199 fmr:C000038100Member fmr:CD10Member 2025-08-31 0000751199 fmr:AAUSTreasuryObligationsMember fmr:C000038100Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyMortgageSecuritiesMember fmr:C000038100Member 2025-08-31 0000751199 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000038100Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyObligationsMember fmr:C000038100Member 2025-08-31 0000751199 fmr:AAOptionsMember fmr:C000038100Member 2025-08-31 0000751199 fmr:AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember fmr:C000038100Member 2025-08-31 0000751199 fmr:C000038100Member fmr:TH0Member 2025-08-31 0000751199 fmr:C000038100Member fmr:TH1Member 2025-08-31 0000751199 fmr:C000038100Member fmr:TH2Member 2025-08-31 0000751199 fmr:C000038100Member fmr:TH3Member 2025-08-31 0000751199 fmr:C000038100Member fmr:TH4Member 2025-08-31 0000751199 fmr:C000038100Member fmr:TH5Member 2025-08-31 0000751199 fmr:C000038100Member fmr:TH6Member 2025-08-31 0000751199 fmr:C000038100Member fmr:TH7Member 2025-08-31 0000751199 fmr:C000038100Member fmr:TH8Member 2025-08-31 0000751199 fmr:C000038100Member fmr:TH9Member 2025-08-31 0000751199 fmr:C000038098Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_LG_ClassMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000038098_ClassMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_ClassMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_ClassMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_ClassMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_ClassMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_ClassMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_ClassMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_ClassMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_ClassMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_ClassMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_ClassMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_LG_1_AdditionalIndexMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000038098_1_AdditionalIndexMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_1_AdditionalIndexMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_1_AdditionalIndexMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_1_AdditionalIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_1_AdditionalIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_1_AdditionalIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_1_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_1_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_1_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_1_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_1_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_LG_2_AdditionalIndexMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000038098_2_AdditionalIndexMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_2_AdditionalIndexMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_2_AdditionalIndexMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_2_AdditionalIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_2_AdditionalIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_2_AdditionalIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_2_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_2_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_2_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_2_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_2_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_0_LG_BBIndexMember_11YRMember 2014-08-31 2025-08-31 0000751199 fmr:C000038098_0_BBIndexMember_AsOf_2015Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_0_BBIndexMember_AsOf_2016Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_0_BBIndexMember_AsOf_2017Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_0_BBIndexMember_AsOf_2018Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_0_BBIndexMember_AsOf_2019Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_0_BBIndexMember_AsOf_2020Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_0_BBIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_0_BBIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_0_BBIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_0_BBIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_0_BBIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000038098_ClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000038098_ClassMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000038098_ClassMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000038098_NoLoadClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000038098_NoLoadClassMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000038098_NoLoadClassMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000038098_0_AdditionalIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000038098_0_AdditionalIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000038098_0_AdditionalIndexMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000038098_1_AdditionalIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000038098_1_AdditionalIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000038098_1_AdditionalIndexMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000038098_2_BBIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000038098_2_BBIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000038098_2_BBIndexMember_10YRMember 2015-08-31 2025-08-31 0000751199 fmr:C000038098Member 2025-08-31 0000751199 fmr:C000038098Member fmr:CD0Member 2025-08-31 0000751199 fmr:C000038098Member fmr:CD1Member 2025-08-31 0000751199 fmr:C000038098Member fmr:CD2Member 2025-08-31 0000751199 fmr:C000038098Member fmr:CD3Member 2025-08-31 0000751199 fmr:C000038098Member fmr:CD4Member 2025-08-31 0000751199 fmr:C000038098Member fmr:CD5Member 2025-08-31 0000751199 fmr:C000038098Member fmr:CD6Member 2025-08-31 0000751199 fmr:C000038098Member fmr:CD7Member 2025-08-31 0000751199 fmr:C000038098Member fmr:CD8Member 2025-08-31 0000751199 fmr:C000038098Member fmr:CD9Member 2025-08-31 0000751199 fmr:C000038098Member fmr:CD10Member 2025-08-31 0000751199 fmr:AAUSTreasuryObligationsMember fmr:C000038098Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyMortgageSecuritiesMember fmr:C000038098Member 2025-08-31 0000751199 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000038098Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyObligationsMember fmr:C000038098Member 2025-08-31 0000751199 fmr:AAOptionsMember fmr:C000038098Member 2025-08-31 0000751199 fmr:AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember fmr:C000038098Member 2025-08-31 0000751199 fmr:C000038098Member fmr:TH0Member 2025-08-31 0000751199 fmr:C000038098Member fmr:TH1Member 2025-08-31 0000751199 fmr:C000038098Member fmr:TH2Member 2025-08-31 0000751199 fmr:C000038098Member fmr:TH3Member 2025-08-31 0000751199 fmr:C000038098Member fmr:TH4Member 2025-08-31 0000751199 fmr:C000038098Member fmr:TH5Member 2025-08-31 0000751199 fmr:C000038098Member fmr:TH6Member 2025-08-31 0000751199 fmr:C000038098Member fmr:TH7Member 2025-08-31 0000751199 fmr:C000038098Member fmr:TH8Member 2025-08-31 0000751199 fmr:C000038098Member fmr:TH9Member 2025-08-31 0000751199 fmr:C000227903Member 2024-08-31 2025-08-31 0000751199 fmr:C000227903_LG_ClassMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000227903_ClassMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000227903_ClassMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000227903_ClassMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000227903_ClassMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000227903_ClassMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000227903_LG_1_AdditionalIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000227903_1_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000227903_1_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000227903_1_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000227903_1_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000227903_1_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000227903_LG_2_AdditionalIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000227903_2_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000227903_2_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000227903_2_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000227903_2_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000227903_2_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000227903_NoLoadClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000227903_NoLoadClassMember_2024-09-01_2025-08-31Member 2024-08-31 2025-08-31 0000751199 fmr:C000227903_0_AdditionalIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000227903_0_AdditionalIndexMember_LOCMember 2024-08-31 2025-08-31 0000751199 fmr:C000227903_1_BBIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000227903_1_BBIndexMember_LOCMember 2024-08-31 2025-08-31 0000751199 fmr:C000227903Member 2021-06-15 2025-08-31 0000751199 fmr:C000227903Member 2025-08-31 0000751199 fmr:C000227903Member fmr:QDUSGovernmentandUSGovernmentAgencyObligationsMember 2025-08-31 0000751199 fmr:C000227903Member fmr:QDAAAMember 2025-08-31 0000751199 fmr:C000227903Member fmr:QDAAMember 2025-08-31 0000751199 fmr:C000227903Member fmr:QDAMember 2025-08-31 0000751199 fmr:C000227903Member fmr:QDBBBMember 2025-08-31 0000751199 fmr:C000227903Member fmr:QDBBMember 2025-08-31 0000751199 fmr:C000227903Member fmr:QDNotRatedMember 2025-08-31 0000751199 fmr:C000227903Member fmr:QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember 2025-08-31 0000751199 fmr:AAUSTreasuryObligationsMember fmr:C000227903Member 2025-08-31 0000751199 fmr:AACorporateBondsMember fmr:C000227903Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyMortgageSecuritiesMember fmr:C000227903Member 2025-08-31 0000751199 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000227903Member 2025-08-31 0000751199 fmr:AAForeignGovernmentandGovernmentAgencyObligationsMember fmr:C000227903Member 2025-08-31 0000751199 fmr:AAAssetBackedSecuritiesMember fmr:C000227903Member 2025-08-31 0000751199 fmr:AAPreferredSecuritiesMember fmr:C000227903Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyObligationsMember fmr:C000227903Member 2025-08-31 0000751199 fmr:AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember fmr:C000227903Member 2025-08-31 0000751199 fmr:C000227903Member country:US 2025-08-31 0000751199 fmr:C000227903Member country:GB 2025-08-31 0000751199 fmr:C000227903Member country:DE 2025-08-31 0000751199 fmr:C000227903Member country:IT 2025-08-31 0000751199 fmr:C000227903Member country:IE 2025-08-31 0000751199 fmr:C000227903Member country:NL 2025-08-31 0000751199 fmr:C000227903Member country:LU 2025-08-31 0000751199 fmr:C000227903Member country:JP 2025-08-31 0000751199 fmr:C000227903Member country:CA 2025-08-31 0000751199 fmr:C000227903Member fmr:OtherMember 2025-08-31 0000751199 fmr:C000227903Member fmr:TH0Member 2025-08-31 0000751199 fmr:C000227903Member fmr:TH1Member 2025-08-31 0000751199 fmr:C000227903Member fmr:TH2Member 2025-08-31 0000751199 fmr:C000227903Member fmr:TH3Member 2025-08-31 0000751199 fmr:C000227903Member fmr:TH4Member 2025-08-31 0000751199 fmr:C000227903Member fmr:TH5Member 2025-08-31 0000751199 fmr:C000227903Member fmr:TH6Member 2025-08-31 0000751199 fmr:C000227903Member fmr:TH7Member 2025-08-31 0000751199 fmr:C000227903Member fmr:TH8Member 2025-08-31 0000751199 fmr:C000227903Member fmr:TH9Member 2025-08-31 0000751199 fmr:C000227906Member 2024-08-31 2025-08-31 0000751199 fmr:C000227906_LG_ClassMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000227906_ClassMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000227906_ClassMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000227906_ClassMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000227906_ClassMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000227906_ClassMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000227906_LG_1_AdditionalIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000227906_1_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000227906_1_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000227906_1_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000227906_1_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000227906_1_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000227906_LG_2_AdditionalIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000227906_2_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000227906_2_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000227906_2_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000227906_2_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000227906_2_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000227906_NoLoadClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000227906_NoLoadClassMember_2024-09-01_2025-08-31Member 2024-08-31 2025-08-31 0000751199 fmr:C000227906_0_AdditionalIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000227906_0_AdditionalIndexMember_LOCMember 2024-08-31 2025-08-31 0000751199 fmr:C000227906_1_BBIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000227906_1_BBIndexMember_LOCMember 2024-08-31 2025-08-31 0000751199 fmr:C000227906Member 2021-06-15 2025-08-31 0000751199 fmr:C000227906Member 2025-08-31 0000751199 fmr:C000227906Member fmr:QDUSGovernmentandUSGovernmentAgencyObligationsMember 2025-08-31 0000751199 fmr:C000227906Member fmr:QDAAAMember 2025-08-31 0000751199 fmr:C000227906Member fmr:QDAAMember 2025-08-31 0000751199 fmr:C000227906Member fmr:QDAMember 2025-08-31 0000751199 fmr:C000227906Member fmr:QDBBBMember 2025-08-31 0000751199 fmr:C000227906Member fmr:QDBBMember 2025-08-31 0000751199 fmr:C000227906Member fmr:QDNotRatedMember 2025-08-31 0000751199 fmr:C000227906Member fmr:QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember 2025-08-31 0000751199 fmr:AAUSTreasuryObligationsMember fmr:C000227906Member 2025-08-31 0000751199 fmr:AACorporateBondsMember fmr:C000227906Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyMortgageSecuritiesMember fmr:C000227906Member 2025-08-31 0000751199 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000227906Member 2025-08-31 0000751199 fmr:AAForeignGovernmentandGovernmentAgencyObligationsMember fmr:C000227906Member 2025-08-31 0000751199 fmr:AAAssetBackedSecuritiesMember fmr:C000227906Member 2025-08-31 0000751199 fmr:AAPreferredSecuritiesMember fmr:C000227906Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyObligationsMember fmr:C000227906Member 2025-08-31 0000751199 fmr:AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember fmr:C000227906Member 2025-08-31 0000751199 fmr:C000227906Member country:US 2025-08-31 0000751199 fmr:C000227906Member country:GB 2025-08-31 0000751199 fmr:C000227906Member country:DE 2025-08-31 0000751199 fmr:C000227906Member country:IT 2025-08-31 0000751199 fmr:C000227906Member country:IE 2025-08-31 0000751199 fmr:C000227906Member country:NL 2025-08-31 0000751199 fmr:C000227906Member country:LU 2025-08-31 0000751199 fmr:C000227906Member country:JP 2025-08-31 0000751199 fmr:C000227906Member country:CA 2025-08-31 0000751199 fmr:C000227906Member fmr:OtherMember 2025-08-31 0000751199 fmr:C000227906Member fmr:TH0Member 2025-08-31 0000751199 fmr:C000227906Member fmr:TH1Member 2025-08-31 0000751199 fmr:C000227906Member fmr:TH2Member 2025-08-31 0000751199 fmr:C000227906Member fmr:TH3Member 2025-08-31 0000751199 fmr:C000227906Member fmr:TH4Member 2025-08-31 0000751199 fmr:C000227906Member fmr:TH5Member 2025-08-31 0000751199 fmr:C000227906Member fmr:TH6Member 2025-08-31 0000751199 fmr:C000227906Member fmr:TH7Member 2025-08-31 0000751199 fmr:C000227906Member fmr:TH8Member 2025-08-31 0000751199 fmr:C000227906Member fmr:TH9Member 2025-08-31 0000751199 fmr:C000227901Member 2024-08-31 2025-08-31 0000751199 fmr:C000227901_LG_ClassMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000227901_ClassMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000227901_ClassMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000227901_ClassMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000227901_ClassMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000227901_ClassMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000227901_LG_1_AdditionalIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000227901_1_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000227901_1_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000227901_1_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000227901_1_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000227901_1_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000227901_LG_2_AdditionalIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000227901_2_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000227901_2_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000227901_2_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000227901_2_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000227901_2_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000227901_ClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000227901_ClassMember_2024-09-01_2025-08-31Member 2024-08-31 2025-08-31 0000751199 fmr:C000227901_NoLoadClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000227901_NoLoadClassMember_2024-09-01_2025-08-31Member 2024-08-31 2025-08-31 0000751199 fmr:C000227901_0_AdditionalIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000227901_0_AdditionalIndexMember_LOCMember 2024-08-31 2025-08-31 0000751199 fmr:C000227901_1_BBIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000227901_1_BBIndexMember_LOCMember 2024-08-31 2025-08-31 0000751199 fmr:C000227901Member 2021-06-15 2025-08-31 0000751199 fmr:C000227901Member 2025-08-31 0000751199 fmr:C000227901Member fmr:QDUSGovernmentandUSGovernmentAgencyObligationsMember 2025-08-31 0000751199 fmr:C000227901Member fmr:QDAAAMember 2025-08-31 0000751199 fmr:C000227901Member fmr:QDAAMember 2025-08-31 0000751199 fmr:C000227901Member fmr:QDAMember 2025-08-31 0000751199 fmr:C000227901Member fmr:QDBBBMember 2025-08-31 0000751199 fmr:C000227901Member fmr:QDBBMember 2025-08-31 0000751199 fmr:C000227901Member fmr:QDNotRatedMember 2025-08-31 0000751199 fmr:C000227901Member fmr:QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember 2025-08-31 0000751199 fmr:AAUSTreasuryObligationsMember fmr:C000227901Member 2025-08-31 0000751199 fmr:AACorporateBondsMember fmr:C000227901Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyMortgageSecuritiesMember fmr:C000227901Member 2025-08-31 0000751199 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000227901Member 2025-08-31 0000751199 fmr:AAForeignGovernmentandGovernmentAgencyObligationsMember fmr:C000227901Member 2025-08-31 0000751199 fmr:AAAssetBackedSecuritiesMember fmr:C000227901Member 2025-08-31 0000751199 fmr:AAPreferredSecuritiesMember fmr:C000227901Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyObligationsMember fmr:C000227901Member 2025-08-31 0000751199 fmr:AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember fmr:C000227901Member 2025-08-31 0000751199 fmr:C000227901Member country:US 2025-08-31 0000751199 fmr:C000227901Member country:GB 2025-08-31 0000751199 fmr:C000227901Member country:DE 2025-08-31 0000751199 fmr:C000227901Member country:IT 2025-08-31 0000751199 fmr:C000227901Member country:IE 2025-08-31 0000751199 fmr:C000227901Member country:NL 2025-08-31 0000751199 fmr:C000227901Member country:LU 2025-08-31 0000751199 fmr:C000227901Member country:JP 2025-08-31 0000751199 fmr:C000227901Member country:CA 2025-08-31 0000751199 fmr:C000227901Member fmr:OtherMember 2025-08-31 0000751199 fmr:C000227901Member fmr:TH0Member 2025-08-31 0000751199 fmr:C000227901Member fmr:TH1Member 2025-08-31 0000751199 fmr:C000227901Member fmr:TH2Member 2025-08-31 0000751199 fmr:C000227901Member fmr:TH3Member 2025-08-31 0000751199 fmr:C000227901Member fmr:TH4Member 2025-08-31 0000751199 fmr:C000227901Member fmr:TH5Member 2025-08-31 0000751199 fmr:C000227901Member fmr:TH6Member 2025-08-31 0000751199 fmr:C000227901Member fmr:TH7Member 2025-08-31 0000751199 fmr:C000227901Member fmr:TH8Member 2025-08-31 0000751199 fmr:C000227901Member fmr:TH9Member 2025-08-31 0000751199 fmr:C000227904Member 2024-08-31 2025-08-31 0000751199 fmr:C000227904_LG_ClassMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000227904_ClassMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000227904_ClassMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000227904_ClassMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000227904_ClassMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000227904_ClassMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000227904_LG_1_AdditionalIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000227904_1_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000227904_1_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000227904_1_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000227904_1_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000227904_1_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000227904_LG_2_AdditionalIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000227904_2_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000227904_2_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000227904_2_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000227904_2_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000227904_2_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000227904_NoLoadClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000227904_NoLoadClassMember_2024-09-01_2025-08-31Member 2024-08-31 2025-08-31 0000751199 fmr:C000227904_0_AdditionalIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000227904_0_AdditionalIndexMember_LOCMember 2024-08-31 2025-08-31 0000751199 fmr:C000227904_1_BBIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000227904_1_BBIndexMember_LOCMember 2024-08-31 2025-08-31 0000751199 fmr:C000227904Member 2021-06-15 2025-08-31 0000751199 fmr:C000227904Member 2025-08-31 0000751199 fmr:C000227904Member fmr:QDUSGovernmentandUSGovernmentAgencyObligationsMember 2025-08-31 0000751199 fmr:C000227904Member fmr:QDAAAMember 2025-08-31 0000751199 fmr:C000227904Member fmr:QDAAMember 2025-08-31 0000751199 fmr:C000227904Member fmr:QDAMember 2025-08-31 0000751199 fmr:C000227904Member fmr:QDBBBMember 2025-08-31 0000751199 fmr:C000227904Member fmr:QDBBMember 2025-08-31 0000751199 fmr:C000227904Member fmr:QDNotRatedMember 2025-08-31 0000751199 fmr:C000227904Member fmr:QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember 2025-08-31 0000751199 fmr:AAUSTreasuryObligationsMember fmr:C000227904Member 2025-08-31 0000751199 fmr:AACorporateBondsMember fmr:C000227904Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyMortgageSecuritiesMember fmr:C000227904Member 2025-08-31 0000751199 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000227904Member 2025-08-31 0000751199 fmr:AAForeignGovernmentandGovernmentAgencyObligationsMember fmr:C000227904Member 2025-08-31 0000751199 fmr:AAAssetBackedSecuritiesMember fmr:C000227904Member 2025-08-31 0000751199 fmr:AAPreferredSecuritiesMember fmr:C000227904Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyObligationsMember fmr:C000227904Member 2025-08-31 0000751199 fmr:AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember fmr:C000227904Member 2025-08-31 0000751199 fmr:C000227904Member country:US 2025-08-31 0000751199 fmr:C000227904Member country:GB 2025-08-31 0000751199 fmr:C000227904Member country:DE 2025-08-31 0000751199 fmr:C000227904Member country:IT 2025-08-31 0000751199 fmr:C000227904Member country:IE 2025-08-31 0000751199 fmr:C000227904Member country:NL 2025-08-31 0000751199 fmr:C000227904Member country:LU 2025-08-31 0000751199 fmr:C000227904Member country:JP 2025-08-31 0000751199 fmr:C000227904Member country:CA 2025-08-31 0000751199 fmr:C000227904Member fmr:OtherMember 2025-08-31 0000751199 fmr:C000227904Member fmr:TH0Member 2025-08-31 0000751199 fmr:C000227904Member fmr:TH1Member 2025-08-31 0000751199 fmr:C000227904Member fmr:TH2Member 2025-08-31 0000751199 fmr:C000227904Member fmr:TH3Member 2025-08-31 0000751199 fmr:C000227904Member fmr:TH4Member 2025-08-31 0000751199 fmr:C000227904Member fmr:TH5Member 2025-08-31 0000751199 fmr:C000227904Member fmr:TH6Member 2025-08-31 0000751199 fmr:C000227904Member fmr:TH7Member 2025-08-31 0000751199 fmr:C000227904Member fmr:TH8Member 2025-08-31 0000751199 fmr:C000227904Member fmr:TH9Member 2025-08-31 0000751199 fmr:C000227905Member 2024-08-31 2025-08-31 0000751199 fmr:C000227905_LG_ClassMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000227905_ClassMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000227905_ClassMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000227905_ClassMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000227905_ClassMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000227905_ClassMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000227905_LG_1_AdditionalIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000227905_1_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000227905_1_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000227905_1_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000227905_1_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000227905_1_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000227905_LG_2_AdditionalIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000227905_2_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000227905_2_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000227905_2_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000227905_2_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000227905_2_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000227905_ClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000227905_ClassMember_2024-09-01_2025-08-31Member 2024-08-31 2025-08-31 0000751199 fmr:C000227905_NoLoadClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000227905_NoLoadClassMember_2024-09-01_2025-08-31Member 2024-08-31 2025-08-31 0000751199 fmr:C000227905_0_AdditionalIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000227905_0_AdditionalIndexMember_LOCMember 2024-08-31 2025-08-31 0000751199 fmr:C000227905_1_BBIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000227905_1_BBIndexMember_LOCMember 2024-08-31 2025-08-31 0000751199 fmr:C000227905Member 2021-06-15 2025-08-31 0000751199 fmr:C000227905Member 2025-08-31 0000751199 fmr:C000227905Member fmr:QDUSGovernmentandUSGovernmentAgencyObligationsMember 2025-08-31 0000751199 fmr:C000227905Member fmr:QDAAAMember 2025-08-31 0000751199 fmr:C000227905Member fmr:QDAAMember 2025-08-31 0000751199 fmr:C000227905Member fmr:QDAMember 2025-08-31 0000751199 fmr:C000227905Member fmr:QDBBBMember 2025-08-31 0000751199 fmr:C000227905Member fmr:QDBBMember 2025-08-31 0000751199 fmr:C000227905Member fmr:QDNotRatedMember 2025-08-31 0000751199 fmr:C000227905Member fmr:QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember 2025-08-31 0000751199 fmr:AAUSTreasuryObligationsMember fmr:C000227905Member 2025-08-31 0000751199 fmr:AACorporateBondsMember fmr:C000227905Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyMortgageSecuritiesMember fmr:C000227905Member 2025-08-31 0000751199 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000227905Member 2025-08-31 0000751199 fmr:AAForeignGovernmentandGovernmentAgencyObligationsMember fmr:C000227905Member 2025-08-31 0000751199 fmr:AAAssetBackedSecuritiesMember fmr:C000227905Member 2025-08-31 0000751199 fmr:AAPreferredSecuritiesMember fmr:C000227905Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyObligationsMember fmr:C000227905Member 2025-08-31 0000751199 fmr:AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember fmr:C000227905Member 2025-08-31 0000751199 fmr:C000227905Member country:US 2025-08-31 0000751199 fmr:C000227905Member country:GB 2025-08-31 0000751199 fmr:C000227905Member country:DE 2025-08-31 0000751199 fmr:C000227905Member country:IT 2025-08-31 0000751199 fmr:C000227905Member country:IE 2025-08-31 0000751199 fmr:C000227905Member country:NL 2025-08-31 0000751199 fmr:C000227905Member country:LU 2025-08-31 0000751199 fmr:C000227905Member country:JP 2025-08-31 0000751199 fmr:C000227905Member country:CA 2025-08-31 0000751199 fmr:C000227905Member fmr:OtherMember 2025-08-31 0000751199 fmr:C000227905Member fmr:TH0Member 2025-08-31 0000751199 fmr:C000227905Member fmr:TH1Member 2025-08-31 0000751199 fmr:C000227905Member fmr:TH2Member 2025-08-31 0000751199 fmr:C000227905Member fmr:TH3Member 2025-08-31 0000751199 fmr:C000227905Member fmr:TH4Member 2025-08-31 0000751199 fmr:C000227905Member fmr:TH5Member 2025-08-31 0000751199 fmr:C000227905Member fmr:TH6Member 2025-08-31 0000751199 fmr:C000227905Member fmr:TH7Member 2025-08-31 0000751199 fmr:C000227905Member fmr:TH8Member 2025-08-31 0000751199 fmr:C000227905Member fmr:TH9Member 2025-08-31 0000751199 fmr:C000227902Member 2024-08-31 2025-08-31 0000751199 fmr:C000227902_LG_ClassMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000227902_ClassMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000227902_ClassMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000227902_ClassMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000227902_ClassMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000227902_ClassMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000227902_LG_1_AdditionalIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000227902_1_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000227902_1_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000227902_1_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000227902_1_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000227902_1_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000227902_LG_2_AdditionalIndexMember_5YRMember 2020-08-31 2025-08-31 0000751199 fmr:C000227902_2_AdditionalIndexMember_AsOf_2021Member 2024-08-31 2025-08-31 0000751199 fmr:C000227902_2_AdditionalIndexMember_AsOf_2022Member 2024-08-31 2025-08-31 0000751199 fmr:C000227902_2_AdditionalIndexMember_AsOf_2023Member 2024-08-31 2025-08-31 0000751199 fmr:C000227902_2_AdditionalIndexMember_AsOf_2024Member 2024-08-31 2025-08-31 0000751199 fmr:C000227902_2_AdditionalIndexMember_AsOf_2025Member 2024-08-31 2025-08-31 0000751199 fmr:C000227902_ClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000227902_ClassMember_2024-09-01_2025-08-31Member 2024-08-31 2025-08-31 0000751199 fmr:C000227902_NoLoadClassMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000227902_NoLoadClassMember_2024-09-01_2025-08-31Member 2024-08-31 2025-08-31 0000751199 fmr:C000227902_0_AdditionalIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000227902_0_AdditionalIndexMember_LOCMember 2024-08-31 2025-08-31 0000751199 fmr:C000227902_1_BBIndexMember_1YRMember 2024-08-31 2025-08-31 0000751199 fmr:C000227902_1_BBIndexMember_LOCMember 2024-08-31 2025-08-31 0000751199 fmr:C000227902Member 2021-06-15 2025-08-31 0000751199 fmr:C000227902Member 2025-08-31 0000751199 fmr:C000227902Member fmr:QDUSGovernmentandUSGovernmentAgencyObligationsMember 2025-08-31 0000751199 fmr:C000227902Member fmr:QDAAAMember 2025-08-31 0000751199 fmr:C000227902Member fmr:QDAAMember 2025-08-31 0000751199 fmr:C000227902Member fmr:QDAMember 2025-08-31 0000751199 fmr:C000227902Member fmr:QDBBBMember 2025-08-31 0000751199 fmr:C000227902Member fmr:QDBBMember 2025-08-31 0000751199 fmr:C000227902Member fmr:QDNotRatedMember 2025-08-31 0000751199 fmr:C000227902Member fmr:QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember 2025-08-31 0000751199 fmr:AAUSTreasuryObligationsMember fmr:C000227902Member 2025-08-31 0000751199 fmr:AACorporateBondsMember fmr:C000227902Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyMortgageSecuritiesMember fmr:C000227902Member 2025-08-31 0000751199 fmr:AACMOsandOtherMortgageRelatedSecuritiesMember fmr:C000227902Member 2025-08-31 0000751199 fmr:AAForeignGovernmentandGovernmentAgencyObligationsMember fmr:C000227902Member 2025-08-31 0000751199 fmr:AAAssetBackedSecuritiesMember fmr:C000227902Member 2025-08-31 0000751199 fmr:AAPreferredSecuritiesMember fmr:C000227902Member 2025-08-31 0000751199 fmr:AAUSGovernmentAgencyObligationsMember fmr:C000227902Member 2025-08-31 0000751199 fmr:AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember fmr:C000227902Member 2025-08-31 0000751199 fmr:C000227902Member country:US 2025-08-31 0000751199 fmr:C000227902Member country:GB 2025-08-31 0000751199 fmr:C000227902Member country:DE 2025-08-31 0000751199 fmr:C000227902Member country:IT 2025-08-31 0000751199 fmr:C000227902Member country:IE 2025-08-31 0000751199 fmr:C000227902Member country:NL 2025-08-31 0000751199 fmr:C000227902Member country:LU 2025-08-31 0000751199 fmr:C000227902Member country:JP 2025-08-31 0000751199 fmr:C000227902Member country:CA 2025-08-31 0000751199 fmr:C000227902Member fmr:OtherMember 2025-08-31 0000751199 fmr:C000227902Member fmr:TH0Member 2025-08-31 0000751199 fmr:C000227902Member fmr:TH1Member 2025-08-31 0000751199 fmr:C000227902Member fmr:TH2Member 2025-08-31 0000751199 fmr:C000227902Member fmr:TH3Member 2025-08-31 0000751199 fmr:C000227902Member fmr:TH4Member 2025-08-31 0000751199 fmr:C000227902Member fmr:TH5Member 2025-08-31 0000751199 fmr:C000227902Member fmr:TH6Member 2025-08-31 0000751199 fmr:C000227902Member fmr:TH7Member 2025-08-31 0000751199 fmr:C000227902Member fmr:TH8Member 2025-08-31 0000751199 fmr:C000227902Member fmr:TH9Member 2025-08-31 0000751199 2024-08-31 2025-08-31 iso4217:USD pure shares N-CSR false 0000751199 N-1A Fidelity Income Fund 2025-08-31 This report describes changes to the Fund that occurred during the reporting period. Fidelity® Total Bond K6 Fund Fidelity® Total Bond K6 Fund FTKFX This annual shareholder report contains information about Fidelity® Total Bond K6 Fund for the period September 1, 2024 to August 31, 2025. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-800-835-5092 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:45%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:24%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:30%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:45%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Total Bond K6 Fund</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:24%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>31<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:30%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.30<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 31 0.0030 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds posted a solid advance for the 12 months ending August 31, 2025, navigating tariff-related uncertainty since late 2024 but buoyed by relatively stable consumer inflation, a resilient economy and the expectation of policy interest-rate cuts by the U.S. Federal Reserve in the second half of 2025.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, allocations to "plus sectors" - including high-yield bonds, leveraged loans, emerging markets debt and global bonds - notably contributed to the fund's outperformance of the Bloomberg U.S. Aggregate Bond Index for the fiscal year.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Among investment-grade bonds, security selection added value. Specifically, fund holdings in the corporate segment made a notable contribution to relative performance, led by picks among financials, particularly REITs and banks. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Overweight holdings and investment choices among asset-backed securities, particularly collateralized loan obligations, and commercial mortgage-backed securities each helped relative performance the past 12 months. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>The fund's underweights in mortgage-backed securities and U.S. Treasurys buoyed relative performance as well. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>The portfolio's yield-curve positioning also provided a boost to performance versus the benchmark.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, the fund's underweight in the bonds of industrial firms within the corporate sector detracted versus the benchmark.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>The fund's modestly longer duration relative to the benchmark also hurt. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Notable changes over the past 12 months included management's decision to gradually lower the fund's overall risk profile by reducing exposure to investment-grade corporate bonds and increasing the allocation to U.S. Treasurys.</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the life of Fund?    CUMULATIVE PERFORMANCE May 25, 2017 through August 31, 2025. Initial investment of $10,000. Fidelity® Total Bond K6 Fund $10,000 $10,135 $10,068 $11,046 $11,905 $12,206 $10,854 $10,882 $11,779 Bloomberg U.S. Aggregate Bond Index $10,000 $10,154 $10,047 $11,070 $11,786 $11,776 $10,420 $10,296 $11,047   2017 2018 2019 2020 2021 2022 2023 2024 2025   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Total Bond K6 Fund</span> 10000 10135 10068 11046 11905 12206 10854 10882 11779 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10154 10047 11070 11786 11776 10420 10296 11047 AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year Life of Fund A Fidelity® Total Bond K6 Fund 3.86% 0.55% 2.47% Bloomberg U.S. Aggregate Bond Index 3.14% -0.68% 1.59% A   From May 25, 2017   Visit www.401k.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. 0.0386 0.0055 0.0247 0.0314 -0.0068 0.0159 2017-05-25 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">www.401k.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2025)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>7,307,000,088</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">4,715</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>19,653,658</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">228<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 7307000088 4715 19653658 2.28   U.S. Government and U.S. Government Agency Obligations 57.4 AAA 7.1 AA 0.5 A 6.7 BBB 12.1 BB 4.2 B 5.4 CCC,CC,C 1.7 D 0.0 Not Rated 7.0 Equities 0.1 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 57.4   AAA - 7.1                                  AA - 0.5                                   A - 6.7                                    BBB - 12.1                                 BB - 4.2                                   B - 5.4                                    CCC,CC,C - 1.7                             D - 0.0                                    Not Rated - 7.0                            Equities - 0.1                           Short-Term Investments and Net Other Assets (Liabilities) - (2.2)%   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         U.S. Treasury Obligations 36.7 Corporate Bonds 22.0 U.S. Government Agency - Mortgage Securities 20.7 Asset-Backed Securities 8.6 CMOs and Other Mortgage Related Securities 7.4 Bank Loan Obligations 5.3 Foreign Government and Government Agency Obligations 1.0 Preferred Securities 0.3 Common Stocks 0.1 Options 0.1 Alternative Funds 0.0 Preferred Stocks 0.0 Other Investments 0.0 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 36.7           Corporate Bonds - 22.0                     U.S. Government Agency - Mortgage Securities - 20.7   Asset-Backed Securities - 8.6              CMOs and Other Mortgage Related Securities - 7.4   Bank Loan Obligations - 5.3                Foreign Government and Government Agency Obligations - 1.0   Preferred Securities - 0.3                 Common Stocks - 0.1                        Options - 0.1                              Alternative Funds - 0.0                    Preferred Stocks - 0.0                     Other Investments - 0.0                  Short-Term Investments and Net Other Assets (Liabilities) - (2.2)%   United States 87.7 Grand Cayman (UK Overseas Ter) 4.3 United Kingdom 1.3 Mexico 1.0 Bailiwick Of Jersey 0.8 Ireland 0.7 Germany 0.7 Canada 0.4 Switzerland 0.4 Others 2.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 87.7                       Grand Cayman (UK Overseas Ter) - 4.3       United Kingdom - 1.3                       Mexico - 1.0                               Bailiwick Of Jersey - 0.8                  Ireland - 0.7                              Germany - 0.7                              Canada - 0.4                               Switzerland - 0.4                          Others - 2.7                                   0.574 0.071 0.005 0.067 0.121 0.042 0.054 0.017 0.000 0.070 0.001 0.367 0.220 0.207 0.086 0.074 0.053 0.010 0.003 0.001 0.001 0.000 0.000 0.000 0.877 0.043 0.013 0.010 0.008 0.007 0.007 0.004 0.004 0.027 TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 25.7   US Treasury Bonds 11.0   Fannie Mae Mortgage pass-thru certificates 7.3   Ginnie Mae II Pool 5.5   Freddie Mac Gold Pool 4.3   Uniform Mortgage Backed Securities 2.7   JPMorgan Chase & Co 1.1   Petroleos Mexicanos 1.0   Fannie Mae Guaranteed REMIC 0.9   Wells Fargo & Co 0.8     60.3   0.257 0.110 0.073 0.055 0.043 0.027 0.011 0.010 0.009 0.008 <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">How has the Fund changed?</span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">This is a summary of certain changes to the Fund since September 1, 2024. For more complete information, you may review the Fund's next prospectus, which we expect to be available by</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">October 30, 2025 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or by sending an e-mail to </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">.</span></div> <div style="text-align:left;text-align-last:auto;"></div> <span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:50%; background-color:#ebf3e9;border-right:2px dashed #368627;padding:19px 19px 19px 19px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fund modified its principal investment strategies during the reporting period.</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"></div></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:50%; background-color:#ebf3e9;padding:19px 19px 19px 19px;" valign="top"><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">This is a summary of certain changes to the Fund since September 1, 2024. For more complete information, you may review the Fund's next prospectus, which we expect to be available by</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">October 30, 2025 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or by sending an e-mail to </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-835-5092</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fund modified its principal investment strategies during the reporting period.</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"></div> 2025-08-31 This report describes changes to the Fund that occurred during the reporting period. Fidelity® Total Bond Fund Fidelity® Total Bond Fund FTBFX This annual shareholder report contains information about Fidelity® Total Bond Fund for the period September 1, 2024 to August 31, 2025. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-800-544-8544 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:45%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:24%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:30%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:45%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Total Bond Fund</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:24%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>46<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:30%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.45<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 46 0.0045 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds posted a solid advance for the 12 months ending August 31, 2025, navigating tariff-related uncertainty since late 2024 but buoyed by relatively stable consumer inflation, a resilient economy and the expectation of policy interest-rate cuts by the U.S. Federal Reserve in the second half of 2025.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, allocations to "plus sectors"- including high-yield bonds, leveraged loans, emerging markets debt, global bonds and high-yield commercial mortgage-backed securities - notably contributed to the fund's outperformance of the Bloomberg U.S. Aggregate Bond Index for the fiscal year.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Among investment-grade bonds, security selection added value. Specifically, fund holdings in the corporate segment made a notable contribution to relative performance, led by picks among financials, particularly REITs and banks. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Overweight holdings and investment choices among asset-backed securities, particularly collateralized loan obligations, and commercial mortgage-backed securities each helped relative performance the past 12 months. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>The fund's underweights in mortgage-backed securities and U.S. Treasurys buoyed relative performance as well. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>The portfolio's yield-curve positioning also provided a boost to performance versus the benchmark.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, the fund's underweight in the bonds of industrial firms within the corporate sector detracted versus the benchmark.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>The fund's modestly longer duration relative to the benchmark also hurt. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Notable changes over the past 12 months included management's decision to gradually lower the fund's overall risk profile by reducing exposure to investment-grade corporate bonds and increasing the allocation to U.S. Treasurys.</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE August 31, 2015 through August 31, 2025. Initial investment of $10,000. Fidelity® Total Bond Fund $10,000 $10,694 $10,915 $10,855 $11,903 $12,810 $13,116 $11,618 $11,661 $12,655 $13,135 Bloomberg U.S. Aggregate Bond Index $10,000 $10,597 $10,649 $10,537 $11,609 $12,360 $12,350 $10,928 $10,797 $11,585 $11,949   2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Total Bond Fund</span> 10000 10694 10915 10855 11903 12810 13116 11618 11661 12655 13135 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10597 10649 10537 11609 12360 12350 10928 10797 11585 11949 AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Fidelity® Total Bond Fund 3.80% 0.50% 2.76% Bloomberg U.S. Aggregate Bond Index 3.14% -0.68% 1.80%     Visit www.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. 0.0380 0.0050 0.0276 0.0314 -0.0068 0.0180 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">www.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2025)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>40,250,131,314</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">6,995</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>110,493,793</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">211<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 40250131314 6995 110493793 2.11   U.S. Government and U.S. Government Agency Obligations 54.4 AAA 8.1 AA 1.0 A 7.7 BBB 13.7 BB 4.5 B 5.5 CCC,CC,C 1.4 D 0.0 Not Rated 6.1 Equities 0.1 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 54.4   AAA - 8.1                                  AA - 1.0                                   A - 7.7                                    BBB - 13.7                                 BB - 4.5                                   B - 5.5                                    CCC,CC,C - 1.4                             D - 0.0                                    Not Rated - 6.1                            Equities - 0.1                           Short-Term Investments and Net Other Assets (Liabilities) - (2.5)%   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         U.S. Treasury Obligations 34.3 Corporate Bonds 24.5 U.S. Government Agency - Mortgage Securities 20.1 Asset-Backed Securities 8.9 CMOs and Other Mortgage Related Securities 7.4 Bank Loan Obligations 5.5 Foreign Government and Government Agency Obligations 1.2 Preferred Securities 0.4 Common Stocks 0.1 Other Investments 0.1 Options 0.0 Preferred Stocks 0.0 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 34.3           Corporate Bonds - 24.5                     U.S. Government Agency - Mortgage Securities - 20.1   Asset-Backed Securities - 8.9              CMOs and Other Mortgage Related Securities - 7.4   Bank Loan Obligations - 5.5                Foreign Government and Government Agency Obligations - 1.2   Preferred Securities - 0.4                 Common Stocks - 0.1                        Other Investments - 0.1                    Options - 0.0                              Preferred Stocks - 0.0                   Short-Term Investments and Net Other Assets (Liabilities) - (2.5)%   United States 85.9 Grand Cayman (UK Overseas Ter) 5.0 United Kingdom 1.4 Mexico 1.3 Germany 0.8 Ireland 0.7 Bailiwick Of Jersey 0.6 France 0.6 Switzerland 0.6 Others 3.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 85.9                       Grand Cayman (UK Overseas Ter) - 5.0       United Kingdom - 1.4                       Mexico - 1.3                               Germany - 0.8                              Ireland - 0.7                              Bailiwick Of Jersey - 0.6                  France - 0.6                               Switzerland - 0.6                          Others - 3.1                                   0.544 0.081 0.010 0.077 0.137 0.045 0.055 0.014 0.000 0.061 0.001 0.343 0.245 0.201 0.089 0.074 0.055 0.012 0.004 0.001 0.001 0.000 0.000 0.859 0.050 0.014 0.013 0.008 0.007 0.006 0.006 0.006 0.031 TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 23.5   US Treasury Bonds 10.8   Fannie Mae Mortgage pass-thru certificates 7.3   Ginnie Mae II Pool 5.2   Freddie Mac Gold Pool 4.5   Uniform Mortgage Backed Securities 2.2   JPMorgan Chase & Co 1.3   Petroleos Mexicanos 1.0   Morgan Stanley 0.9   Bank of America Corp 0.8     57.5   0.235 0.108 0.073 0.052 0.045 0.022 0.013 0.010 0.009 0.008 <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">How has the Fund changed?</span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">This is a summary of certain changes to the Fund since September 1, 2024. For more complete information, you may review the Fund's next prospectus, which we expect to be available by</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">October 30, 2025 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or by sending an e-mail to </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">.</span></div> <div style="text-align:left;text-align-last:auto;"></div> <span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:50%; background-color:#ebf3e9;border-right:2px dashed #368627;padding:19px 19px 19px 19px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fund modified its principal investment strategies during the reporting period.</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"></div></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:50%; background-color:#ebf3e9;padding:19px 19px 19px 19px;" valign="top"><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">This is a summary of certain changes to the Fund since September 1, 2024. For more complete information, you may review the Fund's next prospectus, which we expect to be available by</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">October 30, 2025 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or by sending an e-mail to </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fund modified its principal investment strategies during the reporting period.</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"></div> 2025-08-31 This report describes changes to the Fund that occurred during the reporting period. Fidelity® Total Bond Fund Fidelity Advisor® Total Bond Fund Class Z FBKWX This annual shareholder report contains information about Fidelity® Total Bond Fund for the period September 1, 2024 to August 31, 2025. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-877-208-0098 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:45%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:24%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:30%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:45%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Class Z</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:24%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>37<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:30%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.36<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 37 0.0036 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds posted a solid advance for the 12 months ending August 31, 2025, navigating tariff-related uncertainty since late 2024 but buoyed by relatively stable consumer inflation, a resilient economy and the expectation of policy interest-rate cuts by the U.S. Federal Reserve in the second half of 2025.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, allocations to "plus sectors"- including high-yield bonds, leveraged loans, emerging markets debt, global bonds and high-yield commercial mortgage-backed securities - notably contributed to the fund's outperformance of the Bloomberg U.S. Aggregate Bond Index for the fiscal year.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Among investment-grade bonds, security selection added value. Specifically, fund holdings in the corporate segment made a notable contribution to relative performance, led by picks among financials, particularly REITs and banks. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Overweight holdings and investment choices among asset-backed securities, particularly collateralized loan obligations, and commercial mortgage-backed securities each helped relative performance the past 12 months. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>The fund's underweights in mortgage-backed securities and U.S. Treasurys buoyed relative performance as well. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>The portfolio's yield-curve positioning also provided a boost to performance versus the benchmark.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, the fund's underweight in the bonds of industrial firms within the corporate sector detracted versus the benchmark.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>The fund's modestly longer duration relative to the benchmark also hurt. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Notable changes over the past 12 months included management's decision to gradually lower the fund's overall risk profile by reducing exposure to investment-grade corporate bonds and increasing the allocation to U.S. Treasurys.</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE August 31, 2015 through August 31, 2025. Initial investment of $10,000. Class Z $10,000 $10,714 $10,946 $10,884 $11,946 $12,870 $13,189 $11,702 $11,755 $12,755 $13,265 Bloomberg U.S. Aggregate Bond Index $10,000 $10,597 $10,649 $10,537 $11,609 $12,360 $12,350 $10,928 $10,797 $11,585 $11,949   2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class Z</span> 10000 10714 10946 10884 11946 12870 13189 11702 11755 12755 13265 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10597 10649 10537 11609 12360 12350 10928 10797 11585 11949 AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Class Z 3.99% 0.61% 2.87% Bloomberg U.S. Aggregate Bond Index 3.14% -0.68% 1.80%     Visit institutional.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. 0.0399 0.0061 0.0287 0.0314 -0.0068 0.0180 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">institutional.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2025)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>40,250,131,314</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">6,995</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>110,493,793</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">211<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 40250131314 6995 110493793 2.11   U.S. Government and U.S. Government Agency Obligations 54.4 AAA 8.1 AA 1.0 A 7.7 BBB 13.7 BB 4.5 B 5.5 CCC,CC,C 1.4 D 0.0 Not Rated 6.1 Equities 0.1 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 54.4   AAA - 8.1                                  AA - 1.0                                   A - 7.7                                    BBB - 13.7                                 BB - 4.5                                   B - 5.5                                    CCC,CC,C - 1.4                             D - 0.0                                    Not Rated - 6.1                            Equities - 0.1                           Short-Term Investments and Net Other Assets (Liabilities) - (2.5)%   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         U.S. Treasury Obligations 34.3 Corporate Bonds 24.5 U.S. Government Agency - Mortgage Securities 20.1 Asset-Backed Securities 8.9 CMOs and Other Mortgage Related Securities 7.4 Bank Loan Obligations 5.5 Foreign Government and Government Agency Obligations 1.2 Preferred Securities 0.4 Common Stocks 0.1 Other Investments 0.1 Options 0.0 Preferred Stocks 0.0 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 34.3           Corporate Bonds - 24.5                     U.S. Government Agency - Mortgage Securities - 20.1   Asset-Backed Securities - 8.9              CMOs and Other Mortgage Related Securities - 7.4   Bank Loan Obligations - 5.5                Foreign Government and Government Agency Obligations - 1.2   Preferred Securities - 0.4                 Common Stocks - 0.1                        Other Investments - 0.1                    Options - 0.0                              Preferred Stocks - 0.0                   Short-Term Investments and Net Other Assets (Liabilities) - (2.5)%   United States 85.9 Grand Cayman (UK Overseas Ter) 5.0 United Kingdom 1.4 Mexico 1.3 Germany 0.8 Ireland 0.7 Bailiwick Of Jersey 0.6 France 0.6 Switzerland 0.6 Others 3.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 85.9                       Grand Cayman (UK Overseas Ter) - 5.0       United Kingdom - 1.4                       Mexico - 1.3                               Germany - 0.8                              Ireland - 0.7                              Bailiwick Of Jersey - 0.6                  France - 0.6                               Switzerland - 0.6                          Others - 3.1                                   0.544 0.081 0.010 0.077 0.137 0.045 0.055 0.014 0.000 0.061 0.001 0.343 0.245 0.201 0.089 0.074 0.055 0.012 0.004 0.001 0.001 0.000 0.000 0.859 0.050 0.014 0.013 0.008 0.007 0.006 0.006 0.006 0.031 TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 23.5   US Treasury Bonds 10.8   Fannie Mae Mortgage pass-thru certificates 7.3   Ginnie Mae II Pool 5.2   Freddie Mac Gold Pool 4.5   Uniform Mortgage Backed Securities 2.2   JPMorgan Chase & Co 1.3   Petroleos Mexicanos 1.0   Morgan Stanley 0.9   Bank of America Corp 0.8     57.5   0.235 0.108 0.073 0.052 0.045 0.022 0.013 0.010 0.009 0.008 <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">How has the Fund changed?</span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">This is a summary of certain changes to the Fund since September 1, 2024. For more complete information, you may review the Fund's next prospectus, which we expect to be available by</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">October 30, 2025 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or by sending an e-mail to </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">.</span></div> <div style="text-align:left;text-align-last:auto;"></div> <span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:50%; background-color:#ebf3e9;border-right:2px dashed #368627;padding:19px 19px 19px 19px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fund modified its principal investment strategies during the reporting period.</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"></div></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:50%; background-color:#ebf3e9;padding:19px 19px 19px 19px;" valign="top"><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">This is a summary of certain changes to the Fund since September 1, 2024. For more complete information, you may review the Fund's next prospectus, which we expect to be available by</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">October 30, 2025 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or by sending an e-mail to </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fund modified its principal investment strategies during the reporting period.</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"></div> 2025-08-31 This report describes changes to the Fund that occurred during the reporting period. Fidelity® Total Bond Fund Fidelity Advisor® Total Bond Fund Class M FEPTX This annual shareholder report contains information about Fidelity® Total Bond Fund for the period September 1, 2024 to August 31, 2025. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-877-208-0098 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:45%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:24%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:30%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:45%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Class M</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:24%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>76<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:30%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.75<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 76 0.0075 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds posted a solid advance for the 12 months ending August 31, 2025, navigating tariff-related uncertainty since late 2024 but buoyed by relatively stable consumer inflation, a resilient economy and the expectation of policy interest-rate cuts by the U.S. Federal Reserve in the second half of 2025.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, allocations to "plus sectors"- including high-yield bonds, leveraged loans, emerging markets debt, global bonds and high-yield commercial mortgage-backed securities - notably contributed to the fund's outperformance of the Bloomberg U.S. Aggregate Bond Index for the fiscal year.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Among investment-grade bonds, security selection added value. Specifically, fund holdings in the corporate segment made a notable contribution to relative performance, led by picks among financials, particularly REITs and banks. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Overweight holdings and investment choices among asset-backed securities, particularly collateralized loan obligations, and commercial mortgage-backed securities each helped relative performance the past 12 months. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>The fund's underweights in mortgage-backed securities and U.S. Treasurys buoyed relative performance as well. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>The portfolio's yield-curve positioning also provided a boost to performance versus the benchmark.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, the fund's underweight in the bonds of industrial firms within the corporate sector detracted versus the benchmark.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>The fund's modestly longer duration relative to the benchmark also hurt. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Notable changes over the past 12 months included management's decision to gradually lower the fund's overall risk profile by reducing exposure to investment-grade corporate bonds and increasing the allocation to U.S. Treasurys.</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE August 31, 2015 through August 31, 2025. Initial investment of $10,000 and the current sales charge was paid. Class M $9,600 $10,244 $10,424 $10,324 $11,287 $12,113 $12,366 $10,929 $10,936 $11,821 $12,246 Bloomberg U.S. Aggregate Bond Index $10,000 $10,597 $10,649 $10,537 $11,609 $12,360 $12,350 $10,928 $10,797 $11,585 $11,949   2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class M</span> 9600 10244 10424 10324 11287 12113 12366 10929 10936 11821 12246 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10597 10649 10537 11609 12360 12350 10928 10797 11585 11949 AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Class M (incl. 4.00% sales charge)   -0.55% -0.60% 2.05% Class M (without 4.00% sales charge) 3.60% 0.22% 2.46% Bloomberg U.S. Aggregate Bond Index 3.14% -0.68% 1.80%     Visit institutional.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. -0.0055 -0.0060 0.0205 0.0360 0.0022 0.0246 0.0314 -0.0068 0.0180 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">institutional.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2025)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>40,250,131,314</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">6,995</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>110,493,793</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">211<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 40250131314 6995 110493793 2.11   U.S. Government and U.S. Government Agency Obligations 54.4 AAA 8.1 AA 1.0 A 7.7 BBB 13.7 BB 4.5 B 5.5 CCC,CC,C 1.4 D 0.0 Not Rated 6.1 Equities 0.1 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 54.4   AAA - 8.1                                  AA - 1.0                                   A - 7.7                                    BBB - 13.7                                 BB - 4.5                                   B - 5.5                                    CCC,CC,C - 1.4                             D - 0.0                                    Not Rated - 6.1                            Equities - 0.1                           Short-Term Investments and Net Other Assets (Liabilities) - (2.5)%   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         U.S. Treasury Obligations 34.3 Corporate Bonds 24.5 U.S. Government Agency - Mortgage Securities 20.1 Asset-Backed Securities 8.9 CMOs and Other Mortgage Related Securities 7.4 Bank Loan Obligations 5.5 Foreign Government and Government Agency Obligations 1.2 Preferred Securities 0.4 Common Stocks 0.1 Other Investments 0.1 Options 0.0 Preferred Stocks 0.0 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 34.3           Corporate Bonds - 24.5                     U.S. Government Agency - Mortgage Securities - 20.1   Asset-Backed Securities - 8.9              CMOs and Other Mortgage Related Securities - 7.4   Bank Loan Obligations - 5.5                Foreign Government and Government Agency Obligations - 1.2   Preferred Securities - 0.4                 Common Stocks - 0.1                        Other Investments - 0.1                    Options - 0.0                              Preferred Stocks - 0.0                   Short-Term Investments and Net Other Assets (Liabilities) - (2.5)%   United States 85.9 Grand Cayman (UK Overseas Ter) 5.0 United Kingdom 1.4 Mexico 1.3 Germany 0.8 Ireland 0.7 Bailiwick Of Jersey 0.6 France 0.6 Switzerland 0.6 Others 3.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 85.9                       Grand Cayman (UK Overseas Ter) - 5.0       United Kingdom - 1.4                       Mexico - 1.3                               Germany - 0.8                              Ireland - 0.7                              Bailiwick Of Jersey - 0.6                  France - 0.6                               Switzerland - 0.6                          Others - 3.1                                   0.544 0.081 0.010 0.077 0.137 0.045 0.055 0.014 0.000 0.061 0.001 0.343 0.245 0.201 0.089 0.074 0.055 0.012 0.004 0.001 0.001 0.000 0.000 0.859 0.050 0.014 0.013 0.008 0.007 0.006 0.006 0.006 0.031 TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 23.5   US Treasury Bonds 10.8   Fannie Mae Mortgage pass-thru certificates 7.3   Ginnie Mae II Pool 5.2   Freddie Mac Gold Pool 4.5   Uniform Mortgage Backed Securities 2.2   JPMorgan Chase & Co 1.3   Petroleos Mexicanos 1.0   Morgan Stanley 0.9   Bank of America Corp 0.8     57.5   0.235 0.108 0.073 0.052 0.045 0.022 0.013 0.010 0.009 0.008 <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">How has the Fund changed?</span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">This is a summary of certain changes to the Fund since September 1, 2024. For more complete information, you may review the Fund's next prospectus, which we expect to be available by</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">October 30, 2025 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or by sending an e-mail to </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">.</span></div> <div style="text-align:left;text-align-last:auto;"></div> <span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:50%; background-color:#ebf3e9;border-right:2px dashed #368627;padding:19px 19px 19px 19px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fund modified its principal investment strategies during the reporting period.</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"></div></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:50%; background-color:#ebf3e9;padding:19px 19px 19px 19px;" valign="top"><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">This is a summary of certain changes to the Fund since September 1, 2024. For more complete information, you may review the Fund's next prospectus, which we expect to be available by</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">October 30, 2025 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or by sending an e-mail to </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fund modified its principal investment strategies during the reporting period.</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"></div> 2025-08-31 This report describes changes to the Fund that occurred during the reporting period. Fidelity® Total Bond Fund Fidelity Advisor® Total Bond Fund Class I FEPIX This annual shareholder report contains information about Fidelity® Total Bond Fund for the period September 1, 2024 to August 31, 2025. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-877-208-0098 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:45%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:24%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:30%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:45%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Class I</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:24%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>51<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:30%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.50<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 51 0.0050 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds posted a solid advance for the 12 months ending August 31, 2025, navigating tariff-related uncertainty since late 2024 but buoyed by relatively stable consumer inflation, a resilient economy and the expectation of policy interest-rate cuts by the U.S. Federal Reserve in the second half of 2025.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, allocations to "plus sectors"- including high-yield bonds, leveraged loans, emerging markets debt, global bonds and high-yield commercial mortgage-backed securities - notably contributed to the fund's outperformance of the Bloomberg U.S. Aggregate Bond Index for the fiscal year.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Among investment-grade bonds, security selection added value. Specifically, fund holdings in the corporate segment made a notable contribution to relative performance, led by picks among financials, particularly REITs and banks. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Overweight holdings and investment choices among asset-backed securities, particularly collateralized loan obligations, and commercial mortgage-backed securities each helped relative performance the past 12 months. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>The fund's underweights in mortgage-backed securities and U.S. Treasurys buoyed relative performance as well. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>The portfolio's yield-curve positioning also provided a boost to performance versus the benchmark.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, the fund's underweight in the bonds of industrial firms within the corporate sector detracted versus the benchmark.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>The fund's modestly longer duration relative to the benchmark also hurt. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Notable changes over the past 12 months included management's decision to gradually lower the fund's overall risk profile by reducing exposure to investment-grade corporate bonds and increasing the allocation to U.S. Treasurys.</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE August 31, 2015 through August 31, 2025. Initial investment of $10,000. Class I $10,000 $10,699 $10,916 $10,839 $11,881 $12,781 $13,080 $11,590 $11,625 $12,598 $13,083 Bloomberg U.S. Aggregate Bond Index $10,000 $10,597 $10,649 $10,537 $11,609 $12,360 $12,350 $10,928 $10,797 $11,585 $11,949   2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class I</span> 10000 10699 10916 10839 11881 12781 13080 11590 11625 12598 13083 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10597 10649 10537 11609 12360 12350 10928 10797 11585 11949 AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Class I 3.85% 0.47% 2.72% Bloomberg U.S. Aggregate Bond Index 3.14% -0.68% 1.80%     Visit institutional.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. 0.0385 0.0047 0.0272 0.0314 -0.0068 0.0180 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">institutional.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2025)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>40,250,131,314</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">6,995</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>110,493,793</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">211<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 40250131314 6995 110493793 2.11   U.S. Government and U.S. Government Agency Obligations 54.4 AAA 8.1 AA 1.0 A 7.7 BBB 13.7 BB 4.5 B 5.5 CCC,CC,C 1.4 D 0.0 Not Rated 6.1 Equities 0.1 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 54.4   AAA - 8.1                                  AA - 1.0                                   A - 7.7                                    BBB - 13.7                                 BB - 4.5                                   B - 5.5                                    CCC,CC,C - 1.4                             D - 0.0                                    Not Rated - 6.1                            Equities - 0.1                           Short-Term Investments and Net Other Assets (Liabilities) - (2.5)%   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         U.S. Treasury Obligations 34.3 Corporate Bonds 24.5 U.S. Government Agency - Mortgage Securities 20.1 Asset-Backed Securities 8.9 CMOs and Other Mortgage Related Securities 7.4 Bank Loan Obligations 5.5 Foreign Government and Government Agency Obligations 1.2 Preferred Securities 0.4 Common Stocks 0.1 Other Investments 0.1 Options 0.0 Preferred Stocks 0.0 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 34.3           Corporate Bonds - 24.5                     U.S. Government Agency - Mortgage Securities - 20.1   Asset-Backed Securities - 8.9              CMOs and Other Mortgage Related Securities - 7.4   Bank Loan Obligations - 5.5                Foreign Government and Government Agency Obligations - 1.2   Preferred Securities - 0.4                 Common Stocks - 0.1                        Other Investments - 0.1                    Options - 0.0                              Preferred Stocks - 0.0                   Short-Term Investments and Net Other Assets (Liabilities) - (2.5)%   United States 85.9 Grand Cayman (UK Overseas Ter) 5.0 United Kingdom 1.4 Mexico 1.3 Germany 0.8 Ireland 0.7 Bailiwick Of Jersey 0.6 France 0.6 Switzerland 0.6 Others 3.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 85.9                       Grand Cayman (UK Overseas Ter) - 5.0       United Kingdom - 1.4                       Mexico - 1.3                               Germany - 0.8                              Ireland - 0.7                              Bailiwick Of Jersey - 0.6                  France - 0.6                               Switzerland - 0.6                          Others - 3.1                                   0.544 0.081 0.010 0.077 0.137 0.045 0.055 0.014 0.000 0.061 0.001 0.343 0.245 0.201 0.089 0.074 0.055 0.012 0.004 0.001 0.001 0.000 0.000 0.859 0.050 0.014 0.013 0.008 0.007 0.006 0.006 0.006 0.031 TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 23.5   US Treasury Bonds 10.8   Fannie Mae Mortgage pass-thru certificates 7.3   Ginnie Mae II Pool 5.2   Freddie Mac Gold Pool 4.5   Uniform Mortgage Backed Securities 2.2   JPMorgan Chase & Co 1.3   Petroleos Mexicanos 1.0   Morgan Stanley 0.9   Bank of America Corp 0.8     57.5   0.235 0.108 0.073 0.052 0.045 0.022 0.013 0.010 0.009 0.008 <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">How has the Fund changed?</span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">This is a summary of certain changes to the Fund since September 1, 2024. For more complete information, you may review the Fund's next prospectus, which we expect to be available by</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">October 30, 2025 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or by sending an e-mail to </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">.</span></div> <div style="text-align:left;text-align-last:auto;"></div> <span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:50%; background-color:#ebf3e9;border-right:2px dashed #368627;padding:19px 19px 19px 19px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fund modified its principal investment strategies during the reporting period.</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"></div></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:50%; background-color:#ebf3e9;padding:19px 19px 19px 19px;" valign="top"><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">This is a summary of certain changes to the Fund since September 1, 2024. For more complete information, you may review the Fund's next prospectus, which we expect to be available by</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">October 30, 2025 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or by sending an e-mail to </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fund modified its principal investment strategies during the reporting period.</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"></div> 2025-08-31 This report describes changes to the Fund that occurred during the reporting period. Fidelity® Total Bond Fund Fidelity Advisor® Total Bond Fund Class C FCEPX This annual shareholder report contains information about Fidelity® Total Bond Fund for the period September 1, 2024 to August 31, 2025. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-877-208-0098 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:45%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:24%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:30%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:45%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Class C</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:24%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>153<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:30%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">1.51<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 153 0.0151 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds posted a solid advance for the 12 months ending August 31, 2025, navigating tariff-related uncertainty since late 2024 but buoyed by relatively stable consumer inflation, a resilient economy and the expectation of policy interest-rate cuts by the U.S. Federal Reserve in the second half of 2025.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, allocations to "plus sectors"- including high-yield bonds, leveraged loans, emerging markets debt, global bonds and high-yield commercial mortgage-backed securities - notably contributed to the fund's outperformance of the Bloomberg U.S. Aggregate Bond Index for the fiscal year.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Among investment-grade bonds, security selection added value. Specifically, fund holdings in the corporate segment made a notable contribution to relative performance, led by picks among financials, particularly REITs and banks. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Overweight holdings and investment choices among asset-backed securities, particularly collateralized loan obligations, and commercial mortgage-backed securities each helped relative performance the past 12 months. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>The fund's underweights in mortgage-backed securities and U.S. Treasurys buoyed relative performance as well. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>The portfolio's yield-curve positioning also provided a boost to performance versus the benchmark.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, the fund's underweight in the bonds of industrial firms within the corporate sector detracted versus the benchmark.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>The fund's modestly longer duration relative to the benchmark also hurt. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Notable changes over the past 12 months included management's decision to gradually lower the fund's overall risk profile by reducing exposure to investment-grade corporate bonds and increasing the allocation to U.S. Treasurys.</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE August 31, 2015 through August 31, 2025. Initial investment of $10,000. Class C $10,000 $10,590 $10,695 $10,524 $11,417 $12,157 $12,316 $10,796 $10,720 $11,587 $12,004 Bloomberg U.S. Aggregate Bond Index $10,000 $10,597 $10,649 $10,537 $11,609 $12,360 $12,350 $10,928 $10,797 $11,585 $11,949   2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class C</span> 10000 10590 10695 10524 11417 12157 12316 10796 10720 11587 12004 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10597 10649 10537 11609 12360 12350 10928 10797 11585 11949 AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Class C  (incl. contingent deferred sales charge) 1.82% -0.56% 1.84% Class C 2.81% -0.56% 1.84% Bloomberg U.S. Aggregate Bond Index 3.14% -0.68% 1.80%     Visit institutional.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. 0.0182 -0.0056 0.0184 0.0281 -0.0056 0.0184 0.0314 -0.0068 0.0180 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">institutional.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2025)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>40,250,131,314</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">6,995</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>110,493,793</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">211<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 40250131314 6995 110493793 2.11   U.S. Government and U.S. Government Agency Obligations 54.4 AAA 8.1 AA 1.0 A 7.7 BBB 13.7 BB 4.5 B 5.5 CCC,CC,C 1.4 D 0.0 Not Rated 6.1 Equities 0.1 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 54.4   AAA - 8.1                                  AA - 1.0                                   A - 7.7                                    BBB - 13.7                                 BB - 4.5                                   B - 5.5                                    CCC,CC,C - 1.4                             D - 0.0                                    Not Rated - 6.1                            Equities - 0.1                           Short-Term Investments and Net Other Assets (Liabilities) - (2.5)%   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         U.S. Treasury Obligations 34.3 Corporate Bonds 24.5 U.S. Government Agency - Mortgage Securities 20.1 Asset-Backed Securities 8.9 CMOs and Other Mortgage Related Securities 7.4 Bank Loan Obligations 5.5 Foreign Government and Government Agency Obligations 1.2 Preferred Securities 0.4 Common Stocks 0.1 Other Investments 0.1 Options 0.0 Preferred Stocks 0.0 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 34.3           Corporate Bonds - 24.5                     U.S. Government Agency - Mortgage Securities - 20.1   Asset-Backed Securities - 8.9              CMOs and Other Mortgage Related Securities - 7.4   Bank Loan Obligations - 5.5                Foreign Government and Government Agency Obligations - 1.2   Preferred Securities - 0.4                 Common Stocks - 0.1                        Other Investments - 0.1                    Options - 0.0                              Preferred Stocks - 0.0                   Short-Term Investments and Net Other Assets (Liabilities) - (2.5)%   United States 85.9 Grand Cayman (UK Overseas Ter) 5.0 United Kingdom 1.4 Mexico 1.3 Germany 0.8 Ireland 0.7 Bailiwick Of Jersey 0.6 France 0.6 Switzerland 0.6 Others 3.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 85.9                       Grand Cayman (UK Overseas Ter) - 5.0       United Kingdom - 1.4                       Mexico - 1.3                               Germany - 0.8                              Ireland - 0.7                              Bailiwick Of Jersey - 0.6                  France - 0.6                               Switzerland - 0.6                          Others - 3.1                                   0.544 0.081 0.010 0.077 0.137 0.045 0.055 0.014 0.000 0.061 0.001 0.343 0.245 0.201 0.089 0.074 0.055 0.012 0.004 0.001 0.001 0.000 0.000 0.859 0.050 0.014 0.013 0.008 0.007 0.006 0.006 0.006 0.031 TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 23.5   US Treasury Bonds 10.8   Fannie Mae Mortgage pass-thru certificates 7.3   Ginnie Mae II Pool 5.2   Freddie Mac Gold Pool 4.5   Uniform Mortgage Backed Securities 2.2   JPMorgan Chase & Co 1.3   Petroleos Mexicanos 1.0   Morgan Stanley 0.9   Bank of America Corp 0.8     57.5   0.235 0.108 0.073 0.052 0.045 0.022 0.013 0.010 0.009 0.008 <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">How has the Fund changed?</span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">This is a summary of certain changes to the Fund since September 1, 2024. For more complete information, you may review the Fund's next prospectus, which we expect to be available by</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">October 30, 2025 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or by sending an e-mail to </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">.</span></div> <div style="text-align:left;text-align-last:auto;"></div> <span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:50%; background-color:#ebf3e9;border-right:2px dashed #368627;padding:19px 19px 19px 19px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fund modified its principal investment strategies during the reporting period.</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"></div></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:50%; background-color:#ebf3e9;padding:19px 19px 19px 19px;" valign="top"><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">This is a summary of certain changes to the Fund since September 1, 2024. For more complete information, you may review the Fund's next prospectus, which we expect to be available by</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">October 30, 2025 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or by sending an e-mail to </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fund modified its principal investment strategies during the reporting period.</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"></div> 2025-08-31 This report describes changes to the Fund that occurred during the reporting period. Fidelity® Total Bond Fund Fidelity Advisor® Total Bond Fund Class A FEPAX This annual shareholder report contains information about Fidelity® Total Bond Fund for the period September 1, 2024 to August 31, 2025. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-877-208-0098 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:45%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:24%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:30%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:45%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Class A</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:24%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>76<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:30%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.75<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 76 0.0075 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds posted a solid advance for the 12 months ending August 31, 2025, navigating tariff-related uncertainty since late 2024 but buoyed by relatively stable consumer inflation, a resilient economy and the expectation of policy interest-rate cuts by the U.S. Federal Reserve in the second half of 2025.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, allocations to "plus sectors"- including high-yield bonds, leveraged loans, emerging markets debt, global bonds and high-yield commercial mortgage-backed securities - notably contributed to the fund's outperformance of the Bloomberg U.S. Aggregate Bond Index for the fiscal year.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Among investment-grade bonds, security selection added value. Specifically, fund holdings in the corporate segment made a notable contribution to relative performance, led by picks among financials, particularly REITs and banks. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Overweight holdings and investment choices among asset-backed securities, particularly collateralized loan obligations, and commercial mortgage-backed securities each helped relative performance the past 12 months. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>The fund's underweights in mortgage-backed securities and U.S. Treasurys buoyed relative performance as well. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>The portfolio's yield-curve positioning also provided a boost to performance versus the benchmark.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, the fund's underweight in the bonds of industrial firms within the corporate sector detracted versus the benchmark.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>The fund's modestly longer duration relative to the benchmark also hurt. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Notable changes over the past 12 months included management's decision to gradually lower the fund's overall risk profile by reducing exposure to investment-grade corporate bonds and increasing the allocation to U.S. Treasurys.</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE August 31, 2015 through August 31, 2025. Initial investment of $10,000 and the current sales charge was paid. Class A $9,600 $10,245 $10,426 $10,327 $11,290 $12,114 $12,367 $10,934 $10,941 $11,826 $12,251 Bloomberg U.S. Aggregate Bond Index $10,000 $10,597 $10,649 $10,537 $11,609 $12,360 $12,350 $10,928 $10,797 $11,585 $11,949   2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class A</span> 9600 10245 10426 10327 11290 12114 12367 10934 10941 11826 12251 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10597 10649 10537 11609 12360 12350 10928 10797 11585 11949 AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Class A (incl. 4.00% sales charge)   -0.55% -0.59% 2.05% Class A (without 4.00% sales charge) 3.60% 0.22% 2.47% Bloomberg U.S. Aggregate Bond Index 3.14% -0.68% 1.80%     Visit institutional.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. -0.0055 -0.0059 0.0205 0.0360 0.0022 0.0247 0.0314 -0.0068 0.0180 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">institutional.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2025)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>40,250,131,314</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">6,995</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>110,493,793</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">211<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 40250131314 6995 110493793 2.11   U.S. Government and U.S. Government Agency Obligations 54.4 AAA 8.1 AA 1.0 A 7.7 BBB 13.7 BB 4.5 B 5.5 CCC,CC,C 1.4 D 0.0 Not Rated 6.1 Equities 0.1 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 54.4   AAA - 8.1                                  AA - 1.0                                   A - 7.7                                    BBB - 13.7                                 BB - 4.5                                   B - 5.5                                    CCC,CC,C - 1.4                             D - 0.0                                    Not Rated - 6.1                            Equities - 0.1                           Short-Term Investments and Net Other Assets (Liabilities) - (2.5)%   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         U.S. Treasury Obligations 34.3 Corporate Bonds 24.5 U.S. Government Agency - Mortgage Securities 20.1 Asset-Backed Securities 8.9 CMOs and Other Mortgage Related Securities 7.4 Bank Loan Obligations 5.5 Foreign Government and Government Agency Obligations 1.2 Preferred Securities 0.4 Common Stocks 0.1 Other Investments 0.1 Options 0.0 Preferred Stocks 0.0 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 34.3           Corporate Bonds - 24.5                     U.S. Government Agency - Mortgage Securities - 20.1   Asset-Backed Securities - 8.9              CMOs and Other Mortgage Related Securities - 7.4   Bank Loan Obligations - 5.5                Foreign Government and Government Agency Obligations - 1.2   Preferred Securities - 0.4                 Common Stocks - 0.1                        Other Investments - 0.1                    Options - 0.0                              Preferred Stocks - 0.0                   Short-Term Investments and Net Other Assets (Liabilities) - (2.5)%   United States 85.9 Grand Cayman (UK Overseas Ter) 5.0 United Kingdom 1.4 Mexico 1.3 Germany 0.8 Ireland 0.7 Bailiwick Of Jersey 0.6 France 0.6 Switzerland 0.6 Others 3.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 85.9                       Grand Cayman (UK Overseas Ter) - 5.0       United Kingdom - 1.4                       Mexico - 1.3                               Germany - 0.8                              Ireland - 0.7                              Bailiwick Of Jersey - 0.6                  France - 0.6                               Switzerland - 0.6                          Others - 3.1                                   0.544 0.081 0.010 0.077 0.137 0.045 0.055 0.014 0.000 0.061 0.001 0.343 0.245 0.201 0.089 0.074 0.055 0.012 0.004 0.001 0.001 0.000 0.000 0.859 0.050 0.014 0.013 0.008 0.007 0.006 0.006 0.006 0.031 TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 23.5   US Treasury Bonds 10.8   Fannie Mae Mortgage pass-thru certificates 7.3   Ginnie Mae II Pool 5.2   Freddie Mac Gold Pool 4.5   Uniform Mortgage Backed Securities 2.2   JPMorgan Chase & Co 1.3   Petroleos Mexicanos 1.0   Morgan Stanley 0.9   Bank of America Corp 0.8     57.5   0.235 0.108 0.073 0.052 0.045 0.022 0.013 0.010 0.009 0.008 <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">How has the Fund changed?</span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">This is a summary of certain changes to the Fund since September 1, 2024. For more complete information, you may review the Fund's next prospectus, which we expect to be available by</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">October 30, 2025 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or by sending an e-mail to </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">.</span></div> <div style="text-align:left;text-align-last:auto;"></div> <span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:50%; background-color:#ebf3e9;border-right:2px dashed #368627;padding:19px 19px 19px 19px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fund modified its principal investment strategies during the reporting period.</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"></div></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:50%; background-color:#ebf3e9;padding:19px 19px 19px 19px;" valign="top"><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">This is a summary of certain changes to the Fund since September 1, 2024. For more complete information, you may review the Fund's next prospectus, which we expect to be available by</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">October 30, 2025 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or by sending an e-mail to </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fund modified its principal investment strategies during the reporting period.</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"></div> 2025-08-31 Fidelity® Series Government Bond Index Fund Fidelity® Series Government Bond Index Fund FHNFX This annual shareholder report contains information about Fidelity® Series Government Bond Index Fund for the period September 1, 2024 to August 31, 2025. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544. fundresearch.fidelity.com/prospectus/sec 1-800-544-8544 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:45%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:24%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:30%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:45%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Series Government Bond Index Fund</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:24%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>0<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">A</span></div> </td> <td style="width:30%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.00<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">B</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">A </span><span style="font-family:'Fidelity Sans Cd';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Amount represents less than $.50</span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">B </span><span style="font-family:'Fidelity Sans Cd';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Amount represents less than 0.005%</span></div> <span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"></div> 0 0.0000 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. government bonds advanced for the 12 months ending August 31, 2025, navigating tariff-related uncertainty since late 2024 but buoyed by relatively stable consumer inflation, a resilient economy and the expectation of policy interest-rate cuts by the U.S. Federal Reserve in the second half of 2025.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against that backdrop, we constructed the portfolio using optimization. This approach minimizes the differences between risk exposures of the fund relative to the index. We attempt to hold all positions held by the index in the same relative proportions.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Exposures include duration, key-rate durations and other factors.</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the life of Fund?    CUMULATIVE PERFORMANCE August 17, 2018 through August 31, 2025. Initial investment of $10,000. Fidelity® Series Government Bond Index Fund $10,000 $10,010 $11,052 $11,781 $11,563 $10,330 $10,128 $10,747 Bloomberg U.S. Government Bond Index $10,000 $10,019 $11,052 $11,816 $11,578 $10,340 $10,133 $10,744 Bloomberg U.S. Aggregate Bond Index $10,000 $10,014 $11,033 $11,747 $11,737 $10,386 $10,262 $11,010   2018 2019 2020 2021 2022 2023 2024 2025   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Series Government Bond Index Fund</span> 10000 10010 11052 11781 11563 10330 10128 10747 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Government Bond Index</span> 10000 10019 11052 11816 11578 10340 10133 10744 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10014 11033 11747 11737 10386 10262 11010 AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year Life of Fund A Fidelity® Series Government Bond Index Fund 2.46% -1.34% 1.38% Bloomberg U.S. Government Bond Index 2.44% -1.41% 1.37% Bloomberg U.S. Aggregate Bond Index 3.14% -0.68% 1.82% A   From August 17, 2018   Visit www.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. 0.0246 -0.0134 0.0138 0.0244 -0.0141 0.0137 0.0314 -0.0068 0.0182 2018-08-17 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">www.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2025)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>1,401,265,413</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">256</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>0</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">23<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 1401265413 256 0 0.23   COUPON DISTRIBUTION (% of Fund's net assets) 0.01 - 0.99% 7.2   1 - 1.99% 15.9   2 - 2.99% 12.0   3 - 3.99% 26.5   4 - 4.99% 34.6   5 - 5.99% 1.8   6 - 6.99% 0.7   7 - 7.99% 0.1         U.S. Treasury Obligations 97.8 U.S. Government Agency Obligations 1.0 Short-Term Investments and Net Other Assets (Liabilities) 1.2 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 97.8           U.S. Government Agency Obligations - 1.0   Short-Term Investments and Net Other Assets (Liabilities) - 1.2   0.072 0.159 0.120 0.265 0.346 0.018 0.007 0.001 0.978 0.010 0.012 TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 76.4   US Treasury Bonds 21.4   Fannie Mae 0.3   Federal Farm Credit Banks Funding Corp 0.3   Tennessee Valley Authority 0.2   Federal Home Loan Bank 0.2   Freddie Mac Non Gold Pool 0.0     98.8   0.764 0.214 0.003 0.003 0.002 0.002 0.000 2025-08-31 Fidelity® Intermediate Government Income Fund Fidelity® Intermediate Government Income Fund FSTGX This annual shareholder report contains information about Fidelity® Intermediate Government Income Fund for the period September 1, 2024 to August 31, 2025. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-800-544-8544 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:45%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:24%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:30%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:45%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Intermediate Government Income Fund</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:24%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>46<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:30%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.45<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 46 0.0045 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds posted a solid advance for the 12 months ending August 31, 2025, navigating tariff-related uncertainty since late 2024 but buoyed by relatively stable consumer inflation, a resilient economy and the expectation of policy interest-rate cuts by the U.S. Federal Reserve in the second half of 2025.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, the fund's underweight in agency debentures detracted versus the Bloomberg Intermediate Government Bond Index the past 12 months.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Positioning among conventional mortgage-backed securities with a coupon of 3.5% to 5% also hurt. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, out-of-benchmark exposure to government agency commercial mortgage-backed securities contributed to performance versus the benchmark.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Timely decisions regarding the fund's duration (interest rate) positioning also helped for the 12 months.</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE August 31, 2015 through August 31, 2025. Initial investment of $10,000. Fidelity® Intermediate Government Income Fund $10,000 $10,262 $10,270 $10,114 $10,852 $11,403 $11,280 $10,361 $10,286 $10,898 $11,309 Bloomberg U.S. Intermediate Government Bond Index $10,000 $10,303 $10,312 $10,183 $10,941 $11,535 $11,459 $10,596 $10,582 $11,244 $11,721 Bloomberg U.S. Aggregate Bond Index $10,000 $10,597 $10,649 $10,537 $11,609 $12,360 $12,350 $10,928 $10,797 $11,585 $11,949   2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Intermediate Government Income Fund</span> 10000 10262 10270 10114 10852 11403 11280 10361 10286 10898 11309 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Intermediate Government Bond Index</span> 10000 10303 10312 10183 10941 11535 11459 10596 10582 11244 11721 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10597 10649 10537 11609 12360 12350 10928 10797 11585 11949 AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Fidelity® Intermediate Government Income Fund 3.78% -0.16% 1.24% Bloomberg U.S. Intermediate Government Bond Index 4.24% 0.32% 1.60% Bloomberg U.S. Aggregate Bond Index 3.14% -0.68% 1.80%     Visit www.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. 0.0378 -0.0016 0.0124 0.0424 0.0032 0.0160 0.0314 -0.0068 0.0180 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">www.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2025)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>491,678,042</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">194</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>1,355,766</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">135<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 491678042 194 1355766 1.35   COUPON DISTRIBUTION (% of Fund's net assets) 0.01 - 0.99% 2.3   1 - 1.99% 14.3   2 - 2.99% 13.4   3 - 3.99% 19.4   4 - 4.99% 41.1   5 - 5.99% 2.4   6 - 6.99% 1.8         U.S. Treasury Obligations 77.5 CMOs and Other Mortgage Related Securities 14.0 U.S. Government Agency - Mortgage Securities 3.2 Options 0.2 Short-Term Investments and Net Other Assets (Liabilities) 5.1 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 77.5           CMOs and Other Mortgage Related Securities - 14.0   U.S. Government Agency - Mortgage Securities - 3.2   Options - 0.2                              Short-Term Investments and Net Other Assets (Liabilities) - 5.1   0.023 0.143 0.134 0.194 0.411 0.024 0.018 0.775 0.140 0.032 0.002 0.051 TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 76.6   Freddie Mac Multifamily Structured pass-thru certificates 12.6   Fannie Mae Mortgage pass-thru certificates 1.5   Fannie Mae Guaranteed REMIC 0.9   US Treasury Bonds 0.9   Ginnie Mae II Pool 0.9   Freddie Mac Gold Pool 0.7   Uniform Mortgage Backed Securities 0.4   Ginnie Mae I Pool 0.2   Freddie Mac Non Gold Pool 0.0     94.7   0.766 0.126 0.015 0.009 0.009 0.009 0.007 0.004 0.002 0.000 2025-08-31 Fidelity® Government Income Fund Fidelity® Government Income Fund FGOVX This annual shareholder report contains information about Fidelity® Government Income Fund for the period September 1, 2024 to August 31, 2025. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-800-544-8544 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:45%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:24%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:30%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:45%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Government Income Fund</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:24%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>46<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:30%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.45<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 46 0.0045 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds posted a solid advance for the 12 months ending August 31, 2025, navigating tariff-related uncertainty since late 2024 but buoyed by relatively stable consumer inflation, a resilient economy and the expectation of policy interest-rate cuts by the U.S. Federal Reserve in the second half of 2025.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, the fund's overweight in MBS made up of 20+ year mortgages detracted versus the Bloomberg 75% U.S. Government/25% U.S. Mortgage-Backed Securities Blended Index the past 12 months.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>An underweight in agency debentures also hurt.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, out-of-benchmark exposure to government agency commercial mortgage-backed securities contributed to performance versus the benchmark.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Non-benchmark exposure to agency collateralized mortgage obligation floaters also helped for the 12 months,</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE August 31, 2015 through August 31, 2025. Initial investment of $10,000. Fidelity® Government Income Fund $10,000 $10,435 $10,391 $10,227 $11,181 $11,845 $11,661 $10,396 $10,142 $10,788 $11,037 Bloomberg 75% U.S. Government/25% U.S. Mortgage-Backed Securities Blended Index $10,000 $10,474 $10,429 $10,298 $11,276 $11,989 $11,803 $10,570 $10,356 $11,019 $11,313 Bloomberg U.S. Government Bond Index $10,000 $10,501 $10,413 $10,257 $11,314 $12,096 $11,852 $10,585 $10,373 $10,999 $11,267 Bloomberg U.S. Aggregate Bond Index $10,000 $10,597 $10,649 $10,537 $11,609 $12,360 $12,350 $10,928 $10,797 $11,585 $11,949   2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Government Income Fund</span> 10000 10435 10391 10227 11181 11845 11661 10396 10142 10788 11037 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg 75% U.S. Government/25% U.S. Mortgage-Backed Securities Blended Index</span> 10000 10474 10429 10298 11276 11989 11803 10570 10356 11019 11313 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Government Bond Index</span> 10000 10501 10413 10257 11314 12096 11852 10585 10373 10999 11267 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10597 10649 10537 11609 12360 12350 10928 10797 11585 11949 AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Fidelity® Government Income Fund 2.31% -1.40% 0.99% Bloomberg 75% U.S. Government/25% U.S. Mortgage-Backed Securities Blended Index 2.67% -1.15% 1.24% Bloomberg U.S. Government Bond Index 2.44% -1.41% 1.20% Bloomberg U.S. Aggregate Bond Index 3.14% -0.68% 1.80%     Visit www.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. 0.0231 -0.0140 0.0099 0.0267 -0.0115 0.0124 0.0244 -0.0141 0.0120 0.0314 -0.0068 0.0180 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">www.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2025)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>1,700,857,275</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">1,848</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>5,341,139</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">279<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 1700857275 1848 5341139 2.79   COUPON DISTRIBUTION (% of Fund's net assets) Zero coupon bonds 0.0   1 - 1.99% 6.1   2 - 2.99% 27.5   3 - 3.99% 28.7   4 - 4.99% 21.1   5 - 5.99% 5.9   6 - 6.99% 6.0   7 - 7.99% 0.0   8 - 8.99% 0.0   12 - 12.99% 0.0   13 - 13.99% 0.0         U.S. Treasury Obligations 50.8 U.S. Government Agency - Mortgage Securities 22.4 CMOs and Other Mortgage Related Securities 21.8 U.S. Government Agency Obligations 0.3 Options 0.1 Short-Term Investments and Net Other Assets (Liabilities) 4.6 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 50.8           U.S. Government Agency - Mortgage Securities - 22.4   CMOs and Other Mortgage Related Securities - 21.8   U.S. Government Agency Obligations - 0.3   Options - 0.1                              Short-Term Investments and Net Other Assets (Liabilities) - 4.6   0.000 0.061 0.275 0.287 0.211 0.059 0.060 0.000 0.000 0.000 0.000 0.508 0.224 0.218 0.003 0.001 0.046 TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 34.3   Freddie Mac Multifamily Structured pass-thru certificates 16.8   US Treasury Bonds 16.5   Fannie Mae Mortgage pass-thru certificates 11.0   Freddie Mac Gold Pool 7.9   Ginnie Mae II Pool 4.6   Fannie Mae Guaranteed REMIC 2.2   Ginnie Mae I Pool 1.7   Freddie Mac Non Gold Pool 1.0   Ginnie Mae REMIC pass-thru certificates 0.9     96.9   0.343 0.168 0.165 0.110 0.079 0.046 0.022 0.017 0.010 0.009 2025-08-31 Fidelity® Government Income Fund Fidelity Advisor® Government Income Fund Class Z FIKPX This annual shareholder report contains information about Fidelity® Government Income Fund for the period September 1, 2024 to August 31, 2025. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-877-208-0098 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:45%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:24%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:30%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:45%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Class Z</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:24%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>36<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:30%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.36<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 36 0.0036 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds posted a solid advance for the 12 months ending August 31, 2025, navigating tariff-related uncertainty since late 2024 but buoyed by relatively stable consumer inflation, a resilient economy and the expectation of policy interest-rate cuts by the U.S. Federal Reserve in the second half of 2025.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, the fund's overweight in MBS made up of 20+ year mortgages detracted versus the Bloomberg 75% U.S. Government/25% U.S. Mortgage-Backed Securities Blended Index the past 12 months.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>An underweight in agency debentures also hurt.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, out-of-benchmark exposure to government agency commercial mortgage-backed securities contributed to performance versus the benchmark.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Non-benchmark exposure to agency collateralized mortgage obligation floaters also helped for the 12 months,</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the life of Fund?    CUMULATIVE PERFORMANCE October 2, 2018 through August 31, 2025. Initial investment of $10,000. Class Z $10,000 $11,027 $11,702 $11,520 $10,283 $10,041 $10,689 $10,947 Bloomberg 75% U.S. Government/25% U.S. Mortgage-Backed Securities Blended Index $10,000 $11,042 $11,740 $11,558 $10,350 $10,141 $10,790 $11,078 Bloomberg U.S. Government Bond Index $10,000 $11,132 $11,902 $11,662 $10,415 $10,206 $10,822 $11,087 Bloomberg U.S. Aggregate Bond Index $10,000 $11,086 $11,804 $11,794 $10,436 $10,311 $11,064 $11,411   2018 2019 2020 2021 2022 2023 2024 2025   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class Z</span> 10000 11027 11702 11520 10283 10041 10689 10947 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg 75% U.S. Government/25% U.S. Mortgage-Backed Securities Blended Index</span> 10000 11042 11740 11558 10350 10141 10790 11078 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Government Bond Index</span> 10000 11132 11902 11662 10415 10206 10822 11087 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 11086 11804 11794 10436 10311 11064 11411 AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year Life of Fund A Class Z 2.41% -1.33% 1.32% Bloomberg 75% U.S. Government/25% U.S. Mortgage-Backed Securities Blended Index 2.67% -1.15% 1.49% Bloomberg U.S. Government Bond Index 2.44% -1.41% 1.50% Bloomberg U.S. Aggregate Bond Index 3.14% -0.68% 1.93% A   From October 2, 2018   Visit institutional.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. 0.0241 -0.0133 0.0132 0.0267 -0.0115 0.0149 0.0244 -0.0141 0.0150 0.0314 -0.0068 0.0193 2018-10-02 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">institutional.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2025)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>1,700,857,275</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">1,848</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>5,341,139</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">279<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 1700857275 1848 5341139 2.79   COUPON DISTRIBUTION (% of Fund's net assets) Zero coupon bonds 0.0   1 - 1.99% 6.1   2 - 2.99% 27.5   3 - 3.99% 28.7   4 - 4.99% 21.1   5 - 5.99% 5.9   6 - 6.99% 6.0   7 - 7.99% 0.0   8 - 8.99% 0.0   12 - 12.99% 0.0   13 - 13.99% 0.0         U.S. Treasury Obligations 50.8 U.S. Government Agency - Mortgage Securities 22.4 CMOs and Other Mortgage Related Securities 21.8 U.S. Government Agency Obligations 0.3 Options 0.1 Short-Term Investments and Net Other Assets (Liabilities) 4.6 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 50.8           U.S. Government Agency - Mortgage Securities - 22.4   CMOs and Other Mortgage Related Securities - 21.8   U.S. Government Agency Obligations - 0.3   Options - 0.1                              Short-Term Investments and Net Other Assets (Liabilities) - 4.6   0.000 0.061 0.275 0.287 0.211 0.059 0.060 0.000 0.000 0.000 0.000 0.508 0.224 0.218 0.003 0.001 0.046 TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 34.3   Freddie Mac Multifamily Structured pass-thru certificates 16.8   US Treasury Bonds 16.5   Fannie Mae Mortgage pass-thru certificates 11.0   Freddie Mac Gold Pool 7.9   Ginnie Mae II Pool 4.6   Fannie Mae Guaranteed REMIC 2.2   Ginnie Mae I Pool 1.7   Freddie Mac Non Gold Pool 1.0   Ginnie Mae REMIC pass-thru certificates 0.9     96.9   0.343 0.168 0.165 0.110 0.079 0.046 0.022 0.017 0.010 0.009 2025-08-31 Fidelity® Government Income Fund Fidelity Advisor® Government Income Fund Class M FVITX This annual shareholder report contains information about Fidelity® Government Income Fund for the period September 1, 2024 to August 31, 2025. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-877-208-0098 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:45%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:24%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:30%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:45%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Class M</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:24%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>77<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:30%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.76<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 77 0.0076 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds posted a solid advance for the 12 months ending August 31, 2025, navigating tariff-related uncertainty since late 2024 but buoyed by relatively stable consumer inflation, a resilient economy and the expectation of policy interest-rate cuts by the U.S. Federal Reserve in the second half of 2025.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, the fund's overweight in MBS made up of 20+ year mortgages detracted versus the Bloomberg 75% U.S. Government/25% U.S. Mortgage-Backed Securities Blended Index the past 12 months.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>An underweight in agency debentures also hurt.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, out-of-benchmark exposure to government agency commercial mortgage-backed securities contributed to performance versus the benchmark.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Non-benchmark exposure to agency collateralized mortgage obligation floaters also helped for the 12 months,</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE August 31, 2015 through August 31, 2025. Initial investment of $10,000 and the current sales charge was paid. Class M $9,600 $9,977 $9,904 $9,718 $10,601 $11,195 $10,980 $9,771 $9,493 $10,076 $10,277 Bloomberg 75% U.S. Government/25% U.S. Mortgage-Backed Securities Blended Index $10,000 $10,474 $10,429 $10,298 $11,276 $11,989 $11,803 $10,570 $10,356 $11,019 $11,313 Bloomberg U.S. Government Bond Index $10,000 $10,501 $10,413 $10,257 $11,314 $12,096 $11,852 $10,585 $10,373 $10,999 $11,267 Bloomberg U.S. Aggregate Bond Index $10,000 $10,597 $10,649 $10,537 $11,609 $12,360 $12,350 $10,928 $10,797 $11,585 $11,949   2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class M</span> 9600 9977 9904 9718 10601 11195 10980 9771 9493 10076 10277 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg 75% U.S. Government/25% U.S. Mortgage-Backed Securities Blended Index</span> 10000 10474 10429 10298 11276 11989 11803 10570 10356 11019 11313 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Government Bond Index</span> 10000 10501 10413 10257 11314 12096 11852 10585 10373 10999 11267 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10597 10649 10537 11609 12360 12350 10928 10797 11585 11949 AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Class M (incl. 4.00% sales charge)   -2.08% -2.50% 0.27% Class M (without 4.00% sales charge) 2.00% -1.70% 0.68% Bloomberg 75% U.S. Government/25% U.S. Mortgage-Backed Securities Blended Index 2.67% -1.15% 1.24% Bloomberg U.S. Government Bond Index 2.44% -1.41% 1.20% Bloomberg U.S. Aggregate Bond Index 3.14% -0.68% 1.80%     Visit institutional.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. -0.0208 -0.0250 0.0027 0.0200 -0.0170 0.0068 0.0267 -0.0115 0.0124 0.0244 -0.0141 0.0120 0.0314 -0.0068 0.0180 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">institutional.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2025)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>1,700,857,275</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">1,848</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>5,341,139</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">279<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 1700857275 1848 5341139 2.79   COUPON DISTRIBUTION (% of Fund's net assets) Zero coupon bonds 0.0   1 - 1.99% 6.1   2 - 2.99% 27.5   3 - 3.99% 28.7   4 - 4.99% 21.1   5 - 5.99% 5.9   6 - 6.99% 6.0   7 - 7.99% 0.0   8 - 8.99% 0.0   12 - 12.99% 0.0   13 - 13.99% 0.0         U.S. Treasury Obligations 50.8 U.S. Government Agency - Mortgage Securities 22.4 CMOs and Other Mortgage Related Securities 21.8 U.S. Government Agency Obligations 0.3 Options 0.1 Short-Term Investments and Net Other Assets (Liabilities) 4.6 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 50.8           U.S. Government Agency - Mortgage Securities - 22.4   CMOs and Other Mortgage Related Securities - 21.8   U.S. Government Agency Obligations - 0.3   Options - 0.1                              Short-Term Investments and Net Other Assets (Liabilities) - 4.6   0.000 0.061 0.275 0.287 0.211 0.059 0.060 0.000 0.000 0.000 0.000 0.508 0.224 0.218 0.003 0.001 0.046 TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 34.3   Freddie Mac Multifamily Structured pass-thru certificates 16.8   US Treasury Bonds 16.5   Fannie Mae Mortgage pass-thru certificates 11.0   Freddie Mac Gold Pool 7.9   Ginnie Mae II Pool 4.6   Fannie Mae Guaranteed REMIC 2.2   Ginnie Mae I Pool 1.7   Freddie Mac Non Gold Pool 1.0   Ginnie Mae REMIC pass-thru certificates 0.9     96.9   0.343 0.168 0.165 0.110 0.079 0.046 0.022 0.017 0.010 0.009 2025-08-31 Fidelity® Government Income Fund Fidelity Advisor® Government Income Fund Class I FVIIX This annual shareholder report contains information about Fidelity® Government Income Fund for the period September 1, 2024 to August 31, 2025. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-877-208-0098 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:45%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:24%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:30%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:45%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Class I</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:24%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>50<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:30%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.49<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 50 0.0049 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds posted a solid advance for the 12 months ending August 31, 2025, navigating tariff-related uncertainty since late 2024 but buoyed by relatively stable consumer inflation, a resilient economy and the expectation of policy interest-rate cuts by the U.S. Federal Reserve in the second half of 2025.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, the fund's overweight in MBS made up of 20+ year mortgages detracted versus the Bloomberg 75% U.S. Government/25% U.S. Mortgage-Backed Securities Blended Index the past 12 months.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>An underweight in agency debentures also hurt.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, out-of-benchmark exposure to government agency commercial mortgage-backed securities contributed to performance versus the benchmark.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Non-benchmark exposure to agency collateralized mortgage obligation floaters also helped for the 12 months,</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE August 31, 2015 through August 31, 2025. Initial investment of $10,000. Class I $10,000 $10,419 $10,371 $10,204 $11,161 $11,818 $11,631 $10,368 $10,100 $10,748 $10,992 Bloomberg 75% U.S. Government/25% U.S. Mortgage-Backed Securities Blended Index $10,000 $10,474 $10,429 $10,298 $11,276 $11,989 $11,803 $10,570 $10,356 $11,019 $11,313 Bloomberg U.S. Government Bond Index $10,000 $10,501 $10,413 $10,257 $11,314 $12,096 $11,852 $10,585 $10,373 $10,999 $11,267 Bloomberg U.S. Aggregate Bond Index $10,000 $10,597 $10,649 $10,537 $11,609 $12,360 $12,350 $10,928 $10,797 $11,585 $11,949   2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class I</span> 10000 10419 10371 10204 11161 11818 11631 10368 10100 10748 10992 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg 75% U.S. Government/25% U.S. Mortgage-Backed Securities Blended Index</span> 10000 10474 10429 10298 11276 11989 11803 10570 10356 11019 11313 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Government Bond Index</span> 10000 10501 10413 10257 11314 12096 11852 10585 10373 10999 11267 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10597 10649 10537 11609 12360 12350 10928 10797 11585 11949 AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Class I 2.27% -1.44% 0.95% Bloomberg 75% U.S. Government/25% U.S. Mortgage-Backed Securities Blended Index 2.67% -1.15% 1.24% Bloomberg U.S. Government Bond Index 2.44% -1.41% 1.20% Bloomberg U.S. Aggregate Bond Index 3.14% -0.68% 1.80%     Visit institutional.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. 0.0227 -0.0144 0.0095 0.0267 -0.0115 0.0124 0.0244 -0.0141 0.0120 0.0314 -0.0068 0.0180 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">institutional.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2025)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>1,700,857,275</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">1,848</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>5,341,139</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">279<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 1700857275 1848 5341139 2.79   COUPON DISTRIBUTION (% of Fund's net assets) Zero coupon bonds 0.0   1 - 1.99% 6.1   2 - 2.99% 27.5   3 - 3.99% 28.7   4 - 4.99% 21.1   5 - 5.99% 5.9   6 - 6.99% 6.0   7 - 7.99% 0.0   8 - 8.99% 0.0   12 - 12.99% 0.0   13 - 13.99% 0.0         U.S. Treasury Obligations 50.8 U.S. Government Agency - Mortgage Securities 22.4 CMOs and Other Mortgage Related Securities 21.8 U.S. Government Agency Obligations 0.3 Options 0.1 Short-Term Investments and Net Other Assets (Liabilities) 4.6 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 50.8           U.S. Government Agency - Mortgage Securities - 22.4   CMOs and Other Mortgage Related Securities - 21.8   U.S. Government Agency Obligations - 0.3   Options - 0.1                              Short-Term Investments and Net Other Assets (Liabilities) - 4.6   0.000 0.061 0.275 0.287 0.211 0.059 0.060 0.000 0.000 0.000 0.000 0.508 0.224 0.218 0.003 0.001 0.046 TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 34.3   Freddie Mac Multifamily Structured pass-thru certificates 16.8   US Treasury Bonds 16.5   Fannie Mae Mortgage pass-thru certificates 11.0   Freddie Mac Gold Pool 7.9   Ginnie Mae II Pool 4.6   Fannie Mae Guaranteed REMIC 2.2   Ginnie Mae I Pool 1.7   Freddie Mac Non Gold Pool 1.0   Ginnie Mae REMIC pass-thru certificates 0.9     96.9   0.343 0.168 0.165 0.110 0.079 0.046 0.022 0.017 0.010 0.009 2025-08-31 Fidelity® Government Income Fund Fidelity Advisor® Government Income Fund Class C FVICX This annual shareholder report contains information about Fidelity® Government Income Fund for the period September 1, 2024 to August 31, 2025. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-877-208-0098 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:45%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:24%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:30%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:45%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Class C</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:24%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>156<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:30%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">1.55<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 156 0.0155 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds posted a solid advance for the 12 months ending August 31, 2025, navigating tariff-related uncertainty since late 2024 but buoyed by relatively stable consumer inflation, a resilient economy and the expectation of policy interest-rate cuts by the U.S. Federal Reserve in the second half of 2025.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, the fund's overweight in MBS made up of 20+ year mortgages detracted versus the Bloomberg 75% U.S. Government/25% U.S. Mortgage-Backed Securities Blended Index the past 12 months.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>An underweight in agency debentures also hurt.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, out-of-benchmark exposure to government agency commercial mortgage-backed securities contributed to performance versus the benchmark.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Non-benchmark exposure to agency collateralized mortgage obligation floaters also helped for the 12 months,</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE August 31, 2015 through August 31, 2025. Initial investment of $10,000. Class C $10,000 $10,312 $10,158 $9,889 $10,704 $11,213 $10,920 $9,634 $9,295 $9,863 $10,057 Bloomberg 75% U.S. Government/25% U.S. Mortgage-Backed Securities Blended Index $10,000 $10,474 $10,429 $10,298 $11,276 $11,989 $11,803 $10,570 $10,356 $11,019 $11,313 Bloomberg U.S. Government Bond Index $10,000 $10,501 $10,413 $10,257 $11,314 $12,096 $11,852 $10,585 $10,373 $10,999 $11,267 Bloomberg U.S. Aggregate Bond Index $10,000 $10,597 $10,649 $10,537 $11,609 $12,360 $12,350 $10,928 $10,797 $11,585 $11,949   2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class C</span> 10000 10312 10158 9889 10704 11213 10920 9634 9295 9863 10057 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg 75% U.S. Government/25% U.S. Mortgage-Backed Securities Blended Index</span> 10000 10474 10429 10298 11276 11989 11803 10570 10356 11019 11313 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Government Bond Index</span> 10000 10501 10413 10257 11314 12096 11852 10585 10373 10999 11267 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10597 10649 10537 11609 12360 12350 10928 10797 11585 11949 AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Class C  (incl. contingent deferred sales charge) 0.21% -2.46% 0.06% Class C 1.20% -2.46% 0.06% Bloomberg 75% U.S. Government/25% U.S. Mortgage-Backed Securities Blended Index 2.67% -1.15% 1.24% Bloomberg U.S. Government Bond Index 2.44% -1.41% 1.20% Bloomberg U.S. Aggregate Bond Index 3.14% -0.68% 1.80%     Visit institutional.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. 0.0021 -0.0246 0.0006 0.0120 -0.0246 0.0006 0.0267 -0.0115 0.0124 0.0244 -0.0141 0.0120 0.0314 -0.0068 0.0180 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">institutional.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2025)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>1,700,857,275</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">1,848</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>5,341,139</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">279<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 1700857275 1848 5341139 2.79   COUPON DISTRIBUTION (% of Fund's net assets) Zero coupon bonds 0.0   1 - 1.99% 6.1   2 - 2.99% 27.5   3 - 3.99% 28.7   4 - 4.99% 21.1   5 - 5.99% 5.9   6 - 6.99% 6.0   7 - 7.99% 0.0   8 - 8.99% 0.0   12 - 12.99% 0.0   13 - 13.99% 0.0         U.S. Treasury Obligations 50.8 U.S. Government Agency - Mortgage Securities 22.4 CMOs and Other Mortgage Related Securities 21.8 U.S. Government Agency Obligations 0.3 Options 0.1 Short-Term Investments and Net Other Assets (Liabilities) 4.6 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 50.8           U.S. Government Agency - Mortgage Securities - 22.4   CMOs and Other Mortgage Related Securities - 21.8   U.S. Government Agency Obligations - 0.3   Options - 0.1                              Short-Term Investments and Net Other Assets (Liabilities) - 4.6   0.000 0.061 0.275 0.287 0.211 0.059 0.060 0.000 0.000 0.000 0.000 0.508 0.224 0.218 0.003 0.001 0.046 TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 34.3   Freddie Mac Multifamily Structured pass-thru certificates 16.8   US Treasury Bonds 16.5   Fannie Mae Mortgage pass-thru certificates 11.0   Freddie Mac Gold Pool 7.9   Ginnie Mae II Pool 4.6   Fannie Mae Guaranteed REMIC 2.2   Ginnie Mae I Pool 1.7   Freddie Mac Non Gold Pool 1.0   Ginnie Mae REMIC pass-thru certificates 0.9     96.9   0.343 0.168 0.165 0.110 0.079 0.046 0.022 0.017 0.010 0.009 2025-08-31 Fidelity® Government Income Fund Fidelity Advisor® Government Income Fund Class A FVIAX This annual shareholder report contains information about Fidelity® Government Income Fund for the period September 1, 2024 to August 31, 2025. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-877-208-0098 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:45%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:24%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:30%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:45%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Class A</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:24%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>80<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:30%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.79<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 80 0.0079 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds posted a solid advance for the 12 months ending August 31, 2025, navigating tariff-related uncertainty since late 2024 but buoyed by relatively stable consumer inflation, a resilient economy and the expectation of policy interest-rate cuts by the U.S. Federal Reserve in the second half of 2025.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, the fund's overweight in MBS made up of 20+ year mortgages detracted versus the Bloomberg 75% U.S. Government/25% U.S. Mortgage-Backed Securities Blended Index the past 12 months.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>An underweight in agency debentures also hurt.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, out-of-benchmark exposure to government agency commercial mortgage-backed securities contributed to performance versus the benchmark.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Non-benchmark exposure to agency collateralized mortgage obligation floaters also helped for the 12 months,</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the past 10 years?    CUMULATIVE PERFORMANCE August 31, 2015 through August 31, 2025. Initial investment of $10,000 and the current sales charge was paid. Class A $9,600 $9,976 $9,903 $9,716 $10,597 $11,190 $10,984 $9,764 $9,484 $10,064 $10,262 Bloomberg 75% U.S. Government/25% U.S. Mortgage-Backed Securities Blended Index $10,000 $10,474 $10,429 $10,298 $11,276 $11,989 $11,803 $10,570 $10,356 $11,019 $11,313 Bloomberg U.S. Government Bond Index $10,000 $10,501 $10,413 $10,257 $11,314 $12,096 $11,852 $10,585 $10,373 $10,999 $11,267 Bloomberg U.S. Aggregate Bond Index $10,000 $10,597 $10,649 $10,537 $11,609 $12,360 $12,350 $10,928 $10,797 $11,585 $11,949   2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class A</span> 9600 9976 9903 9716 10597 11190 10984 9764 9484 10064 10262 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg 75% U.S. Government/25% U.S. Mortgage-Backed Securities Blended Index</span> 10000 10474 10429 10298 11276 11989 11803 10570 10356 11019 11313 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Government Bond Index</span> 10000 10501 10413 10257 11314 12096 11852 10585 10373 10999 11267 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10597 10649 10537 11609 12360 12350 10928 10797 11585 11949 AVERAGE ANNUAL TOTAL RETURNS:   1 Year 5 Year 10 Year Class A (incl. 4.00% sales charge)   -2.11% -2.52% 0.26% Class A (without 4.00% sales charge) 1.97% -1.72% 0.67% Bloomberg 75% U.S. Government/25% U.S. Mortgage-Backed Securities Blended Index 2.67% -1.15% 1.24% Bloomberg U.S. Government Bond Index 2.44% -1.41% 1.20% Bloomberg U.S. Aggregate Bond Index 3.14% -0.68% 1.80%     Visit institutional.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. -0.0211 -0.0252 0.0026 0.0197 -0.0172 0.0067 0.0267 -0.0115 0.0124 0.0244 -0.0141 0.0120 0.0314 -0.0068 0.0180 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">institutional.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2025)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>1,700,857,275</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">1,848</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>5,341,139</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">279<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 1700857275 1848 5341139 2.79   COUPON DISTRIBUTION (% of Fund's net assets) Zero coupon bonds 0.0   1 - 1.99% 6.1   2 - 2.99% 27.5   3 - 3.99% 28.7   4 - 4.99% 21.1   5 - 5.99% 5.9   6 - 6.99% 6.0   7 - 7.99% 0.0   8 - 8.99% 0.0   12 - 12.99% 0.0   13 - 13.99% 0.0         U.S. Treasury Obligations 50.8 U.S. Government Agency - Mortgage Securities 22.4 CMOs and Other Mortgage Related Securities 21.8 U.S. Government Agency Obligations 0.3 Options 0.1 Short-Term Investments and Net Other Assets (Liabilities) 4.6 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 50.8           U.S. Government Agency - Mortgage Securities - 22.4   CMOs and Other Mortgage Related Securities - 21.8   U.S. Government Agency Obligations - 0.3   Options - 0.1                              Short-Term Investments and Net Other Assets (Liabilities) - 4.6   0.000 0.061 0.275 0.287 0.211 0.059 0.060 0.000 0.000 0.000 0.000 0.508 0.224 0.218 0.003 0.001 0.046 TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 34.3   Freddie Mac Multifamily Structured pass-thru certificates 16.8   US Treasury Bonds 16.5   Fannie Mae Mortgage pass-thru certificates 11.0   Freddie Mac Gold Pool 7.9   Ginnie Mae II Pool 4.6   Fannie Mae Guaranteed REMIC 2.2   Ginnie Mae I Pool 1.7   Freddie Mac Non Gold Pool 1.0   Ginnie Mae REMIC pass-thru certificates 0.9     96.9   0.343 0.168 0.165 0.110 0.079 0.046 0.022 0.017 0.010 0.009 2025-08-31 Fidelity® Environmental Bond Fund Fidelity® Environmental Bond Fund FFEBX This annual shareholder report contains information about Fidelity® Environmental Bond Fund for the period September 1, 2024 to August 31, 2025. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-800-544-8544 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:45%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:24%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:30%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:45%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Environmental Bond Fund</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:24%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>46<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:30%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.45<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 46 0.0045 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds posted a solid advance for the 12 months ending August 31, 2025, navigating tariff-related uncertainty since late 2024 but buoyed by relatively stable consumer inflation, a resilient economy and the expectation of policy interest-rate cuts by the U.S. Federal Reserve in the second half of 2025.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, yield curve positioning was a small detractor from the fund's performance versus the benchmark Bloomberg U.S. Aggregate Bond Index for the fiscal year, while sector and security selection were positive contributors.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In terms of sector positioning, underweight positions in the energy and capital goods sectors detracted. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, overweights in banks, REITs and utilities helped, as did an underweight in U.S. Treasurys.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>On an individual security basis, holdings in ZF, a European auto parts manufacturer, and Charter Communications detracted most. Not owning Boeing also dragged on relative performance.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Conversely, top contributors included U.S. REIT Hudson Pacific Properties, European utility RWE and U.S. renewable developer AES.<br/> </span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:italic;font-weight:normal;">Application of FMR's environmental, social, and governance (ESG) ratings process and/or its sustainable investing exclusion criteria may affect the Fund's exposure to certain issuers, sectors, regions, and countries and may affect the Fund's performance.</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the life of Fund?    CUMULATIVE PERFORMANCE June 15, 2021 through August 31, 2025. Initial investment of $10,000. Fidelity® Environmental Bond Fund $10,000 $10,116 $8,841 $8,748 $9,411 Bloomberg MSCI Global Green USD Bond Index (Hedged USD) $10,000 $10,120 $8,921 $8,966 $9,691 Bloomberg U.S. Aggregate Bond Index $10,000 $10,126 $8,960 $8,853 $9,499   2021 2022 2023 2024 2025   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Environmental Bond Fund</span> 10000 10116 8841 8748 9411 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg MSCI Global Green USD Bond Index (Hedged USD)</span> 10000 10120 8921 8966 9691 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10126 8960 8853 9499 AVERAGE ANNUAL TOTAL RETURNS:   1 Year Life of Fund A Fidelity® Environmental Bond Fund 3.06% -0.72% Bloomberg MSCI Global Green USD Bond Index (Hedged USD) 4.62% 0.33% Bloomberg U.S. Aggregate Bond Index 3.14% -0.49% A   From June 15, 2021   Visit www.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. 0.0306 -0.0072 0.0462 0.0033 0.0314 -0.0049 2021-06-15 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">www.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2025)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>47,490,167</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">229</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>145,387</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">50<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 47490167 229 145387 0.50   U.S. Government and U.S. Government Agency Obligations 56.6 AAA 0.6 AA 2.3 A 11.5 BBB 20.0 BB 2.6 Not Rated 2.2 Short-Term Investments and Net Other Assets (Liabilities) 4.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 56.6   AAA - 0.6                                  AA - 2.3                                   A - 11.5                                   BBB - 20.0                                 BB - 2.6                                   Not Rated - 2.2                            Short-Term Investments and Net Other Assets (Liabilities) - 4.2   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         U.S. Treasury Obligations 43.5 Corporate Bonds 35.5 U.S. Government Agency - Mortgage Securities 12.7 CMOs and Other Mortgage Related Securities 1.9 Foreign Government and Government Agency Obligations 0.7 Asset-Backed Securities 0.6 Preferred Securities 0.5 U.S. Government Agency Obligations 0.4 Short-Term Investments and Net Other Assets (Liabilities) 4.2 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 43.5           Corporate Bonds - 35.5                     U.S. Government Agency - Mortgage Securities - 12.7   CMOs and Other Mortgage Related Securities - 1.9   Foreign Government and Government Agency Obligations - 0.7   Asset-Backed Securities - 0.6              Preferred Securities - 0.5                 U.S. Government Agency Obligations - 0.4   Short-Term Investments and Net Other Assets (Liabilities) - 4.2   United States 87.0 United Kingdom 2.5 Germany 2.2 Italy 1.5 Ireland 1.4 Netherlands 1.1 Luxembourg 1.0 Japan 0.6 Canada 0.6 Others 2.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 87.0                       United Kingdom - 2.5                       Germany - 2.2                              Italy - 1.5                                Ireland - 1.4                              Netherlands - 1.1                          Luxembourg - 1.0                           Japan - 0.6                                Canada - 0.6                               Others - 2.1                                   0.566 0.006 0.023 0.115 0.200 0.026 0.022 0.042 0.435 0.355 0.127 0.019 0.007 0.006 0.005 0.004 0.042 0.870 0.025 0.022 0.015 0.014 0.011 0.010 0.006 0.006 0.021 TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 30.4   US Treasury Bonds 12.1   Freddie Mac Gold Pool 6.2   Fannie Mae Mortgage pass-thru certificates 5.9   Freddie Mac Multifamily Structured pass-thru certificates 1.7   PNC Financial Services Group Inc/The 1.5   Verizon Communications Inc 1.3   US Treasury Bill 1.0   UDR Inc 0.9   Enel Finance International NV 0.9     61.9   0.304 0.121 0.062 0.059 0.017 0.015 0.013 0.010 0.009 0.009 2025-08-31 Fidelity® Environmental Bond Fund Fidelity Advisor® Environmental Bond Fund Class Z FEBGX This annual shareholder report contains information about Fidelity® Environmental Bond Fund for the period September 1, 2024 to August 31, 2025. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-877-208-0098 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:45%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:24%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:30%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:45%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Class Z</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:24%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>37<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:30%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.36<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 37 0.0036 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds posted a solid advance for the 12 months ending August 31, 2025, navigating tariff-related uncertainty since late 2024 but buoyed by relatively stable consumer inflation, a resilient economy and the expectation of policy interest-rate cuts by the U.S. Federal Reserve in the second half of 2025.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, yield curve positioning was a small detractor from the fund's performance versus the benchmark Bloomberg U.S. Aggregate Bond Index for the fiscal year, while sector and security selection were positive contributors.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In terms of sector positioning, underweight positions in the energy and capital goods sectors detracted. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, overweights in banks, REITs and utilities helped, as did an underweight in U.S. Treasurys.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>On an individual security basis, holdings in ZF, a European auto parts manufacturer, and Charter Communications detracted most. Not owning Boeing also dragged on relative performance.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Conversely, top contributors included U.S. REIT Hudson Pacific Properties, European utility RWE and U.S. renewable developer AES.<br/> </span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:italic;font-weight:normal;">Application of FMR's environmental, social, and governance (ESG) ratings process and/or its sustainable investing exclusion criteria may affect the Fund's exposure to certain issuers, sectors, regions, and countries and may affect the Fund's performance.</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the life of Fund?    CUMULATIVE PERFORMANCE June 15, 2021 through August 31, 2025. Initial investment of $10,000. Class Z $10,000 $10,118 $8,851 $8,766 $9,438 Bloomberg MSCI Global Green USD Bond Index (Hedged USD) $10,000 $10,120 $8,921 $8,966 $9,691 Bloomberg U.S. Aggregate Bond Index $10,000 $10,126 $8,960 $8,853 $9,499   2021 2022 2023 2024 2025   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class Z</span> 10000 10118 8851 8766 9438 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg MSCI Global Green USD Bond Index (Hedged USD)</span> 10000 10120 8921 8966 9691 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10126 8960 8853 9499 AVERAGE ANNUAL TOTAL RETURNS:   1 Year Life of Fund A Class Z 3.15% -0.63% Bloomberg MSCI Global Green USD Bond Index (Hedged USD) 4.62% 0.33% Bloomberg U.S. Aggregate Bond Index 3.14% -0.49% A   From June 15, 2021   Visit institutional.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. 0.0315 -0.0063 0.0462 0.0033 0.0314 -0.0049 2021-06-15 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">institutional.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2025)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>47,490,167</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">229</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>145,387</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">50<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 47490167 229 145387 0.50   U.S. Government and U.S. Government Agency Obligations 56.6 AAA 0.6 AA 2.3 A 11.5 BBB 20.0 BB 2.6 Not Rated 2.2 Short-Term Investments and Net Other Assets (Liabilities) 4.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 56.6   AAA - 0.6                                  AA - 2.3                                   A - 11.5                                   BBB - 20.0                                 BB - 2.6                                   Not Rated - 2.2                            Short-Term Investments and Net Other Assets (Liabilities) - 4.2   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         U.S. Treasury Obligations 43.5 Corporate Bonds 35.5 U.S. Government Agency - Mortgage Securities 12.7 CMOs and Other Mortgage Related Securities 1.9 Foreign Government and Government Agency Obligations 0.7 Asset-Backed Securities 0.6 Preferred Securities 0.5 U.S. Government Agency Obligations 0.4 Short-Term Investments and Net Other Assets (Liabilities) 4.2 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 43.5           Corporate Bonds - 35.5                     U.S. Government Agency - Mortgage Securities - 12.7   CMOs and Other Mortgage Related Securities - 1.9   Foreign Government and Government Agency Obligations - 0.7   Asset-Backed Securities - 0.6              Preferred Securities - 0.5                 U.S. Government Agency Obligations - 0.4   Short-Term Investments and Net Other Assets (Liabilities) - 4.2   United States 87.0 United Kingdom 2.5 Germany 2.2 Italy 1.5 Ireland 1.4 Netherlands 1.1 Luxembourg 1.0 Japan 0.6 Canada 0.6 Others 2.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 87.0                       United Kingdom - 2.5                       Germany - 2.2                              Italy - 1.5                                Ireland - 1.4                              Netherlands - 1.1                          Luxembourg - 1.0                           Japan - 0.6                                Canada - 0.6                               Others - 2.1                                   0.566 0.006 0.023 0.115 0.200 0.026 0.022 0.042 0.435 0.355 0.127 0.019 0.007 0.006 0.005 0.004 0.042 0.870 0.025 0.022 0.015 0.014 0.011 0.010 0.006 0.006 0.021 TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 30.4   US Treasury Bonds 12.1   Freddie Mac Gold Pool 6.2   Fannie Mae Mortgage pass-thru certificates 5.9   Freddie Mac Multifamily Structured pass-thru certificates 1.7   PNC Financial Services Group Inc/The 1.5   Verizon Communications Inc 1.3   US Treasury Bill 1.0   UDR Inc 0.9   Enel Finance International NV 0.9     61.9   0.304 0.121 0.062 0.059 0.017 0.015 0.013 0.010 0.009 0.009 2025-08-31 Fidelity® Environmental Bond Fund Fidelity Advisor® Environmental Bond Fund Class M FEBEX This annual shareholder report contains information about Fidelity® Environmental Bond Fund for the period September 1, 2024 to August 31, 2025. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-877-208-0098 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:45%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:24%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:30%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:45%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Class M</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:24%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>68<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:30%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.67<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 68 0.0067 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds posted a solid advance for the 12 months ending August 31, 2025, navigating tariff-related uncertainty since late 2024 but buoyed by relatively stable consumer inflation, a resilient economy and the expectation of policy interest-rate cuts by the U.S. Federal Reserve in the second half of 2025.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, yield curve positioning was a small detractor from the fund's performance versus the benchmark Bloomberg U.S. Aggregate Bond Index for the fiscal year, while sector and security selection were positive contributors.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In terms of sector positioning, underweight positions in the energy and capital goods sectors detracted. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, overweights in banks, REITs and utilities helped, as did an underweight in U.S. Treasurys.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>On an individual security basis, holdings in ZF, a European auto parts manufacturer, and Charter Communications detracted most. Not owning Boeing also dragged on relative performance.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Conversely, top contributors included U.S. REIT Hudson Pacific Properties, European utility RWE and U.S. renewable developer AES.<br/> </span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:italic;font-weight:normal;">Application of FMR's environmental, social, and governance (ESG) ratings process and/or its sustainable investing exclusion criteria may affect the Fund's exposure to certain issuers, sectors, regions, and countries and may affect the Fund's performance.</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the life of Fund?    CUMULATIVE PERFORMANCE June 15, 2021 through August 31, 2025. Initial investment of $10,000 and the current sales charge was paid. Class M $9,600 $9,706 $8,466 $8,357 $8,970 Bloomberg MSCI Global Green USD Bond Index (Hedged USD) $10,000 $10,120 $8,921 $8,966 $9,691 Bloomberg U.S. Aggregate Bond Index $10,000 $10,126 $8,960 $8,853 $9,499   2021 2022 2023 2024 2025   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class M</span> 9600 9706 8466 8357 8970 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg MSCI Global Green USD Bond Index (Hedged USD)</span> 10000 10120 8921 8966 9691 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10126 8960 8853 9499 AVERAGE ANNUAL TOTAL RETURNS:   1 Year Life of Fund A Class M (incl. 4.00% sales charge)   -1.28% -1.90% Class M (without 4.00% sales charge) 2.84% -0.94% Bloomberg MSCI Global Green USD Bond Index (Hedged USD) 4.62% 0.33% Bloomberg U.S. Aggregate Bond Index 3.14% -0.49% A   From June 15, 2021   Visit institutional.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. -0.0128 -0.0190 0.0284 -0.0094 0.0462 0.0033 0.0314 -0.0049 2021-06-15 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">institutional.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2025)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>47,490,167</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">229</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>145,387</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">50<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 47490167 229 145387 0.50   U.S. Government and U.S. Government Agency Obligations 56.6 AAA 0.6 AA 2.3 A 11.5 BBB 20.0 BB 2.6 Not Rated 2.2 Short-Term Investments and Net Other Assets (Liabilities) 4.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 56.6   AAA - 0.6                                  AA - 2.3                                   A - 11.5                                   BBB - 20.0                                 BB - 2.6                                   Not Rated - 2.2                            Short-Term Investments and Net Other Assets (Liabilities) - 4.2   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         U.S. Treasury Obligations 43.5 Corporate Bonds 35.5 U.S. Government Agency - Mortgage Securities 12.7 CMOs and Other Mortgage Related Securities 1.9 Foreign Government and Government Agency Obligations 0.7 Asset-Backed Securities 0.6 Preferred Securities 0.5 U.S. Government Agency Obligations 0.4 Short-Term Investments and Net Other Assets (Liabilities) 4.2 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 43.5           Corporate Bonds - 35.5                     U.S. Government Agency - Mortgage Securities - 12.7   CMOs and Other Mortgage Related Securities - 1.9   Foreign Government and Government Agency Obligations - 0.7   Asset-Backed Securities - 0.6              Preferred Securities - 0.5                 U.S. Government Agency Obligations - 0.4   Short-Term Investments and Net Other Assets (Liabilities) - 4.2   United States 87.0 United Kingdom 2.5 Germany 2.2 Italy 1.5 Ireland 1.4 Netherlands 1.1 Luxembourg 1.0 Japan 0.6 Canada 0.6 Others 2.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 87.0                       United Kingdom - 2.5                       Germany - 2.2                              Italy - 1.5                                Ireland - 1.4                              Netherlands - 1.1                          Luxembourg - 1.0                           Japan - 0.6                                Canada - 0.6                               Others - 2.1                                   0.566 0.006 0.023 0.115 0.200 0.026 0.022 0.042 0.435 0.355 0.127 0.019 0.007 0.006 0.005 0.004 0.042 0.870 0.025 0.022 0.015 0.014 0.011 0.010 0.006 0.006 0.021 TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 30.4   US Treasury Bonds 12.1   Freddie Mac Gold Pool 6.2   Fannie Mae Mortgage pass-thru certificates 5.9   Freddie Mac Multifamily Structured pass-thru certificates 1.7   PNC Financial Services Group Inc/The 1.5   Verizon Communications Inc 1.3   US Treasury Bill 1.0   UDR Inc 0.9   Enel Finance International NV 0.9     61.9   0.304 0.121 0.062 0.059 0.017 0.015 0.013 0.010 0.009 0.009 2025-08-31 This report describes changes to the Fund that occurred during the reporting period. Fidelity® Environmental Bond Fund Fidelity Advisor® Environmental Bond Fund Class I FEBFX This annual shareholder report contains information about Fidelity® Environmental Bond Fund for the period September 1, 2024 to August 31, 2025. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-877-208-0098 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:45%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:24%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:30%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:45%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Class I</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:24%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>46<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:30%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.45<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 46 0.0045 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds posted a solid advance for the 12 months ending August 31, 2025, navigating tariff-related uncertainty since late 2024 but buoyed by relatively stable consumer inflation, a resilient economy and the expectation of policy interest-rate cuts by the U.S. Federal Reserve in the second half of 2025.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, yield curve positioning was a small detractor from the fund's performance versus the benchmark Bloomberg U.S. Aggregate Bond Index for the fiscal year, while sector and security selection were positive contributors.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In terms of sector positioning, underweight positions in the energy and capital goods sectors detracted. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, overweights in banks, REITs and utilities helped, as did an underweight in U.S. Treasurys.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>On an individual security basis, holdings in ZF, a European auto parts manufacturer, and Charter Communications detracted most. Not owning Boeing also dragged on relative performance.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Conversely, top contributors included U.S. REIT Hudson Pacific Properties, European utility RWE and U.S. renewable developer AES.<br/> </span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:italic;font-weight:normal;">Application of FMR's environmental, social, and governance (ESG) ratings process and/or its sustainable investing exclusion criteria may affect the Fund's exposure to certain issuers, sectors, regions, and countries and may affect the Fund's performance.</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the life of Fund?    CUMULATIVE PERFORMANCE June 15, 2021 through August 31, 2025. Initial investment of $10,000. Class I $10,000 $10,116 $8,844 $8,740 $9,407 Bloomberg MSCI Global Green USD Bond Index (Hedged USD) $10,000 $10,120 $8,921 $8,966 $9,691 Bloomberg U.S. Aggregate Bond Index $10,000 $10,126 $8,960 $8,853 $9,499   2021 2022 2023 2024 2025   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class I</span> 10000 10116 8844 8740 9407 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg MSCI Global Green USD Bond Index (Hedged USD)</span> 10000 10120 8921 8966 9691 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10126 8960 8853 9499 AVERAGE ANNUAL TOTAL RETURNS:   1 Year Life of Fund A Class I 3.06% -0.73% Bloomberg MSCI Global Green USD Bond Index (Hedged USD) 4.62% 0.33% Bloomberg U.S. Aggregate Bond Index 3.14% -0.49% A   From June 15, 2021   Visit institutional.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. 0.0306 -0.0073 0.0462 0.0033 0.0314 -0.0049 2021-06-15 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">institutional.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2025)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>47,490,167</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">229</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>145,387</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">50<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 47490167 229 145387 0.50   U.S. Government and U.S. Government Agency Obligations 56.6 AAA 0.6 AA 2.3 A 11.5 BBB 20.0 BB 2.6 Not Rated 2.2 Short-Term Investments and Net Other Assets (Liabilities) 4.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 56.6   AAA - 0.6                                  AA - 2.3                                   A - 11.5                                   BBB - 20.0                                 BB - 2.6                                   Not Rated - 2.2                            Short-Term Investments and Net Other Assets (Liabilities) - 4.2   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         U.S. Treasury Obligations 43.5 Corporate Bonds 35.5 U.S. Government Agency - Mortgage Securities 12.7 CMOs and Other Mortgage Related Securities 1.9 Foreign Government and Government Agency Obligations 0.7 Asset-Backed Securities 0.6 Preferred Securities 0.5 U.S. Government Agency Obligations 0.4 Short-Term Investments and Net Other Assets (Liabilities) 4.2 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 43.5           Corporate Bonds - 35.5                     U.S. Government Agency - Mortgage Securities - 12.7   CMOs and Other Mortgage Related Securities - 1.9   Foreign Government and Government Agency Obligations - 0.7   Asset-Backed Securities - 0.6              Preferred Securities - 0.5                 U.S. Government Agency Obligations - 0.4   Short-Term Investments and Net Other Assets (Liabilities) - 4.2   United States 87.0 United Kingdom 2.5 Germany 2.2 Italy 1.5 Ireland 1.4 Netherlands 1.1 Luxembourg 1.0 Japan 0.6 Canada 0.6 Others 2.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 87.0                       United Kingdom - 2.5                       Germany - 2.2                              Italy - 1.5                                Ireland - 1.4                              Netherlands - 1.1                          Luxembourg - 1.0                           Japan - 0.6                                Canada - 0.6                               Others - 2.1                                   0.566 0.006 0.023 0.115 0.200 0.026 0.022 0.042 0.435 0.355 0.127 0.019 0.007 0.006 0.005 0.004 0.042 0.870 0.025 0.022 0.015 0.014 0.011 0.010 0.006 0.006 0.021 TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 30.4   US Treasury Bonds 12.1   Freddie Mac Gold Pool 6.2   Fannie Mae Mortgage pass-thru certificates 5.9   Freddie Mac Multifamily Structured pass-thru certificates 1.7   PNC Financial Services Group Inc/The 1.5   Verizon Communications Inc 1.3   US Treasury Bill 1.0   UDR Inc 0.9   Enel Finance International NV 0.9     61.9   0.304 0.121 0.062 0.059 0.017 0.015 0.013 0.010 0.009 0.009 <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">How has the Fund changed?</span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">This is a summary of certain changes to the Fund since September 1, 2024. For more complete information, you may review the Fund's next prospectus, which we expect to be available by</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">October 30, 2025 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or by sending an e-mail to </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">.</span></div> <div style="text-align:left;text-align-last:auto;"></div> <span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:50%; background-color:#ebf3e9;border-right:2px dashed #368627;padding:19px 19px 19px 19px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:</span> <div style="text-align:left;text-align-last:auto;"></div> <ul style="color:#000000;list-style-type:disc;margin:0px 0px 0px 25px;padding:0px;"><li style="margin:5px 0px 2px 24px;padding:0px 0px 0px 0px;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Expense reductions</span></li></ul> <span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"></div></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:50%; background-color:#ebf3e9;padding:19px 19px 19px 19px;" valign="top"><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">This is a summary of certain changes to the Fund since September 1, 2024. For more complete information, you may review the Fund's next prospectus, which we expect to be available by</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">October 30, 2025 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or by sending an e-mail to </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:</span> <div style="text-align:left;text-align-last:auto;"></div> <ul style="color:#000000;list-style-type:disc;margin:0px 0px 0px 25px;padding:0px;"><li style="margin:5px 0px 2px 24px;padding:0px 0px 0px 0px;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Expense reductions</span></li></ul> <span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"></div> 2025-08-31 Fidelity® Environmental Bond Fund Fidelity Advisor® Environmental Bond Fund Class C FEBDX This annual shareholder report contains information about Fidelity® Environmental Bond Fund for the period September 1, 2024 to August 31, 2025. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-877-208-0098 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:45%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:24%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:30%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:45%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Class C</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:24%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>145<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:30%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">1.44<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 145 0.0144 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds posted a solid advance for the 12 months ending August 31, 2025, navigating tariff-related uncertainty since late 2024 but buoyed by relatively stable consumer inflation, a resilient economy and the expectation of policy interest-rate cuts by the U.S. Federal Reserve in the second half of 2025.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, yield curve positioning was a small detractor from the fund's performance versus the benchmark Bloomberg U.S. Aggregate Bond Index for the fiscal year, while sector and security selection were positive contributors.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In terms of sector positioning, underweight positions in the energy and capital goods sectors detracted. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, overweights in banks, REITs and utilities helped, as did an underweight in U.S. Treasurys.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>On an individual security basis, holdings in ZF, a European auto parts manufacturer, and Charter Communications detracted most. Not owning Boeing also dragged on relative performance.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Conversely, top contributors included U.S. REIT Hudson Pacific Properties, European utility RWE and U.S. renewable developer AES.<br/> </span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:italic;font-weight:normal;">Application of FMR's environmental, social, and governance (ESG) ratings process and/or its sustainable investing exclusion criteria may affect the Fund's exposure to certain issuers, sectors, regions, and countries and may affect the Fund's performance.</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the life of Fund?    CUMULATIVE PERFORMANCE June 15, 2021 through August 31, 2025. Initial investment of $10,000. Class C $10,000 $10,090 $8,736 $8,560 $9,129 Bloomberg MSCI Global Green USD Bond Index (Hedged USD) $10,000 $10,120 $8,921 $8,966 $9,691 Bloomberg U.S. Aggregate Bond Index $10,000 $10,126 $8,960 $8,853 $9,499   2021 2022 2023 2024 2025   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class C</span> 10000 10090 8736 8560 9129 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg MSCI Global Green USD Bond Index (Hedged USD)</span> 10000 10120 8921 8966 9691 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10126 8960 8853 9499 AVERAGE ANNUAL TOTAL RETURNS:   1 Year Life of Fund A Class C  (incl. contingent deferred sales charge) 0.94% -1.69% Class C 1.93% -1.69% Bloomberg MSCI Global Green USD Bond Index (Hedged USD) 4.62% 0.33% Bloomberg U.S. Aggregate Bond Index 3.14% -0.49% A   From June 15, 2021   Visit institutional.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. 0.0094 -0.0169 0.0193 -0.0169 0.0462 0.0033 0.0314 -0.0049 2021-06-15 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">institutional.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2025)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>47,490,167</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">229</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>145,387</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">50<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 47490167 229 145387 0.50   U.S. Government and U.S. Government Agency Obligations 56.6 AAA 0.6 AA 2.3 A 11.5 BBB 20.0 BB 2.6 Not Rated 2.2 Short-Term Investments and Net Other Assets (Liabilities) 4.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 56.6   AAA - 0.6                                  AA - 2.3                                   A - 11.5                                   BBB - 20.0                                 BB - 2.6                                   Not Rated - 2.2                            Short-Term Investments and Net Other Assets (Liabilities) - 4.2   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         U.S. Treasury Obligations 43.5 Corporate Bonds 35.5 U.S. Government Agency - Mortgage Securities 12.7 CMOs and Other Mortgage Related Securities 1.9 Foreign Government and Government Agency Obligations 0.7 Asset-Backed Securities 0.6 Preferred Securities 0.5 U.S. Government Agency Obligations 0.4 Short-Term Investments and Net Other Assets (Liabilities) 4.2 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 43.5           Corporate Bonds - 35.5                     U.S. Government Agency - Mortgage Securities - 12.7   CMOs and Other Mortgage Related Securities - 1.9   Foreign Government and Government Agency Obligations - 0.7   Asset-Backed Securities - 0.6              Preferred Securities - 0.5                 U.S. Government Agency Obligations - 0.4   Short-Term Investments and Net Other Assets (Liabilities) - 4.2   United States 87.0 United Kingdom 2.5 Germany 2.2 Italy 1.5 Ireland 1.4 Netherlands 1.1 Luxembourg 1.0 Japan 0.6 Canada 0.6 Others 2.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 87.0                       United Kingdom - 2.5                       Germany - 2.2                              Italy - 1.5                                Ireland - 1.4                              Netherlands - 1.1                          Luxembourg - 1.0                           Japan - 0.6                                Canada - 0.6                               Others - 2.1                                   0.566 0.006 0.023 0.115 0.200 0.026 0.022 0.042 0.435 0.355 0.127 0.019 0.007 0.006 0.005 0.004 0.042 0.870 0.025 0.022 0.015 0.014 0.011 0.010 0.006 0.006 0.021 TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 30.4   US Treasury Bonds 12.1   Freddie Mac Gold Pool 6.2   Fannie Mae Mortgage pass-thru certificates 5.9   Freddie Mac Multifamily Structured pass-thru certificates 1.7   PNC Financial Services Group Inc/The 1.5   Verizon Communications Inc 1.3   US Treasury Bill 1.0   UDR Inc 0.9   Enel Finance International NV 0.9     61.9   0.304 0.121 0.062 0.059 0.017 0.015 0.013 0.010 0.009 0.009 2025-08-31 Fidelity® Environmental Bond Fund Fidelity Advisor® Environmental Bond Fund Class A FEBBX This annual shareholder report contains information about Fidelity® Environmental Bond Fund for the period September 1, 2024 to August 31, 2025. annual shareholder report You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. fundresearch.fidelity.com/prospectus/sec 1-877-208-0098 fidfunddocuments@fidelity.com <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last year?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:45%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> </td> <td style="width:24%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div> </td> <td style="width:30%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:45%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Class A</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:24%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>70<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div> </td> <td style="width:30%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.69<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> </td> <td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 70 0.0069 <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</span> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. taxable investment-grade bonds posted a solid advance for the 12 months ending August 31, 2025, navigating tariff-related uncertainty since late 2024 but buoyed by relatively stable consumer inflation, a resilient economy and the expectation of policy interest-rate cuts by the U.S. Federal Reserve in the second half of 2025.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, yield curve positioning was a small detractor from the fund's performance versus the benchmark Bloomberg U.S. Aggregate Bond Index for the fiscal year, while sector and security selection were positive contributors.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In terms of sector positioning, underweight positions in the energy and capital goods sectors detracted. </span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, overweights in banks, REITs and utilities helped, as did an underweight in U.S. Treasurys.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>On an individual security basis, holdings in ZF, a European auto parts manufacturer, and Charter Communications detracted most. Not owning Boeing also dragged on relative performance.</span></div> <div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Conversely, top contributors included U.S. REIT Hudson Pacific Properties, European utility RWE and U.S. renewable developer AES.<br/> </span></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:italic;font-weight:normal;">Application of FMR's environmental, social, and governance (ESG) ratings process and/or its sustainable investing exclusion criteria may affect the Fund's exposure to certain issuers, sectors, regions, and countries and may affect the Fund's performance.</span></div> <div style="text-align:left;text-align-last:auto;"></div> How did the Fund perform over the life of Fund?    CUMULATIVE PERFORMANCE June 15, 2021 through August 31, 2025. Initial investment of $10,000 and the current sales charge was paid. Class A $9,600 $9,706 $8,465 $8,355 $8,966 Bloomberg MSCI Global Green USD Bond Index (Hedged USD) $10,000 $10,120 $8,921 $8,966 $9,691 Bloomberg U.S. Aggregate Bond Index $10,000 $10,126 $8,960 $8,853 $9,499   2021 2022 2023 2024 2025   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class A</span> 9600 9706 8465 8355 8966 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg MSCI Global Green USD Bond Index (Hedged USD)</span> 10000 10120 8921 8966 9691 <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Aggregate Bond Index</span> 10000 10126 8960 8853 9499 AVERAGE ANNUAL TOTAL RETURNS:   1 Year Life of Fund A Class A (incl. 4.00% sales charge)   -1.30% -1.91% Class A (without 4.00% sales charge) 2.81% -0.96% Bloomberg MSCI Global Green USD Bond Index (Hedged USD) 4.62% 0.33% Bloomberg U.S. Aggregate Bond Index 3.14% -0.49% A   From June 15, 2021   Visit institutional.fidelity.com for more recent performance information.    The Fund's past performance is not a good predictor of the Fund's future performance.  The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. -0.0130 -0.0191 0.0281 -0.0096 0.0462 0.0033 0.0314 -0.0049 2021-06-15 <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">institutional.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> <span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span> <span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of August 31, 2025)</span></div> <div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span></div> <div style="text-align:left;text-align-last:auto;"></div> <div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> <span> </span></span></div> <div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>47,490,167</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">229</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Total Advisory Fee</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>145,387</div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="middle"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> <tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div> </td> <td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">50<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div> <div style="text-align:right;text-align-last:auto;"></div> </td> <td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div> </td> </tr> </table> </div> <div style="text-align:left;text-align-last:auto;"></div> 47490167 229 145387 0.50   U.S. Government and U.S. Government Agency Obligations 56.6 AAA 0.6 AA 2.3 A 11.5 BBB 20.0 BB 2.6 Not Rated 2.2 Short-Term Investments and Net Other Assets (Liabilities) 4.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 56.6   AAA - 0.6                                  AA - 2.3                                   A - 11.5                                   BBB - 20.0                                 BB - 2.6                                   Not Rated - 2.2                            Short-Term Investments and Net Other Assets (Liabilities) - 4.2   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         U.S. Treasury Obligations 43.5 Corporate Bonds 35.5 U.S. Government Agency - Mortgage Securities 12.7 CMOs and Other Mortgage Related Securities 1.9 Foreign Government and Government Agency Obligations 0.7 Asset-Backed Securities 0.6 Preferred Securities 0.5 U.S. Government Agency Obligations 0.4 Short-Term Investments and Net Other Assets (Liabilities) 4.2 ASSET ALLOCATION (% of Fund's net assets)     U.S. Treasury Obligations - 43.5           Corporate Bonds - 35.5                     U.S. Government Agency - Mortgage Securities - 12.7   CMOs and Other Mortgage Related Securities - 1.9   Foreign Government and Government Agency Obligations - 0.7   Asset-Backed Securities - 0.6              Preferred Securities - 0.5                 U.S. Government Agency Obligations - 0.4   Short-Term Investments and Net Other Assets (Liabilities) - 4.2   United States 87.0 United Kingdom 2.5 Germany 2.2 Italy 1.5 Ireland 1.4 Netherlands 1.1 Luxembourg 1.0 Japan 0.6 Canada 0.6 Others 2.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 87.0                       United Kingdom - 2.5                       Germany - 2.2                              Italy - 1.5                                Ireland - 1.4                              Netherlands - 1.1                          Luxembourg - 1.0                           Japan - 0.6                                Canada - 0.6                               Others - 2.1                                   0.566 0.006 0.023 0.115 0.200 0.026 0.022 0.042 0.435 0.355 0.127 0.019 0.007 0.006 0.005 0.004 0.042 0.870 0.025 0.022 0.015 0.014 0.011 0.010 0.006 0.006 0.021 TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 30.4   US Treasury Bonds 12.1   Freddie Mac Gold Pool 6.2   Fannie Mae Mortgage pass-thru certificates 5.9   Freddie Mac Multifamily Structured pass-thru certificates 1.7   PNC Financial Services Group Inc/The 1.5   Verizon Communications Inc 1.3   US Treasury Bill 1.0   UDR Inc 0.9   Enel Finance International NV 0.9     61.9   0.304 0.121 0.062 0.059 0.017 0.015 0.013 0.010 0.009 0.009