0000035315
2026-04-29
2026-04-29
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
2026-04-29
2026-04-29
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:C000171137Member
2026-04-29
2026-04-29
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:InterestRateChangesMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:IssuerSpecificChangesMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:USTreasuryObligationsMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:CorrelationToIndexMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:PassiveManagementRiskMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
oef:RiskNotInsuredDepositoryInstitutionMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
oef:RiskLoseMoneyMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:C000171137Member
2017-01-01
2017-12-31
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:C000171137Member
2018-01-01
2018-12-31
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:C000171137Member
2019-01-01
2019-12-31
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:C000171137Member
2020-01-01
2020-12-31
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:C000171137Member
2021-01-01
2021-12-31
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:C000171137Member
2022-01-01
2022-12-31
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:C000171137Member
2023-01-01
2023-12-31
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:C000171137Member
2024-01-01
2024-12-31
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:C000171137Member
2025-01-01
2025-12-31
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:C000171137Member
2025-04-29
2026-04-29
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:C000171137Member
2021-04-29
2026-04-29
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:C000171137Member
2016-04-29
2026-04-29
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:C000171137Member
oef:AfterTaxesOnDistributionsMember
2025-04-29
2026-04-29
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:C000171137Member
oef:AfterTaxesOnDistributionsMember
2021-04-29
2026-04-29
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:C000171137Member
oef:AfterTaxesOnDistributionsMember
2016-04-29
2026-04-29
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:C000171137Member
oef:AfterTaxesOnDistributionsAndSalesMember
2025-04-29
2026-04-29
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:C000171137Member
oef:AfterTaxesOnDistributionsAndSalesMember
2021-04-29
2026-04-29
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:C000171137Member
oef:AfterTaxesOnDistributionsAndSalesMember
2016-04-29
2026-04-29
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:IndexLB010Member
2025-04-29
2026-04-29
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:IndexLB010Member
2021-04-29
2026-04-29
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:IndexLB010Member
2016-04-29
2026-04-29
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:IndexLB001Member
2025-04-29
2026-04-29
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:IndexLB001Member
2021-04-29
2026-04-29
0000035315
fmr:FidelitySeriesLong-TermTreasuryBondIndexFund-PROMember
fmr:S000054519Member
fmr:IndexLB001Member
2016-04-29
2026-04-29
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:C000161035Member
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:InterestRateChangesMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:IssuerSpecificChangesMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:USTreasuryObligationsMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:CorrelationToIndexMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:PassiveManagementRiskMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
oef:RiskNotInsuredDepositoryInstitutionMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
oef:RiskLoseMoneyMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:C000161035Member
2016-01-01
2016-12-31
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:C000161035Member
2017-01-01
2017-12-31
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:C000161035Member
2018-01-01
2018-12-31
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:C000161035Member
2019-01-01
2019-12-31
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:C000161035Member
2020-01-01
2020-12-31
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:C000161035Member
2021-01-01
2021-12-31
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:C000161035Member
2022-01-01
2022-12-31
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:C000161035Member
2023-01-01
2023-12-31
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:C000161035Member
2024-01-01
2024-12-31
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:C000161035Member
2025-01-01
2025-12-31
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:C000161035Member
2025-04-29
2026-04-29
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:C000161035Member
2021-04-29
2026-04-29
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:C000161035Member
2016-04-29
2026-04-29
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:C000161035Member
oef:AfterTaxesOnDistributionsMember
2025-04-29
2026-04-29
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:C000161035Member
oef:AfterTaxesOnDistributionsMember
2021-04-29
2026-04-29
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:C000161035Member
oef:AfterTaxesOnDistributionsMember
2016-04-29
2026-04-29
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:C000161035Member
oef:AfterTaxesOnDistributionsAndSalesMember
2025-04-29
2026-04-29
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:C000161035Member
oef:AfterTaxesOnDistributionsAndSalesMember
2021-04-29
2026-04-29
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:C000161035Member
oef:AfterTaxesOnDistributionsAndSalesMember
2016-04-29
2026-04-29
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:IndexLB145Member
2025-04-29
2026-04-29
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:IndexLB145Member
2021-04-29
2026-04-29
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:IndexLB145Member
2016-04-29
2026-04-29
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:IndexLB001Member
2025-04-29
2026-04-29
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:IndexLB001Member
2021-04-29
2026-04-29
0000035315
fmr:FidelitySAILong-TermTreasuryBondIndexFund-PROMember
fmr:S000051138Member
fmr:IndexLB001Member
2016-04-29
2026-04-29
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:C000166451Member
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:InterestRateChangesMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:IssuerSpecificChangesMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:USTreasuryObligationsMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:CorrelationToIndexMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:PassiveManagementRiskMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
oef:RiskNotInsuredDepositoryInstitutionMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
oef:RiskLoseMoneyMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:C000166451Member
2017-01-01
2017-12-31
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:C000166451Member
2018-01-01
2018-12-31
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:C000166451Member
2019-01-01
2019-12-31
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:C000166451Member
2020-01-01
2020-12-31
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:C000166451Member
2021-01-01
2021-12-31
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:C000166451Member
2022-01-01
2022-12-31
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:C000166451Member
2023-01-01
2023-12-31
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:C000166451Member
2024-01-01
2024-12-31
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:C000166451Member
2025-01-01
2025-12-31
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:C000166451Member
2025-04-29
2026-04-29
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:C000166451Member
2021-04-29
2026-04-29
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:C000166451Member
2016-04-29
2026-04-29
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:C000166451Member
oef:AfterTaxesOnDistributionsMember
2025-04-29
2026-04-29
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:C000166451Member
oef:AfterTaxesOnDistributionsMember
2021-04-29
2026-04-29
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:C000166451Member
oef:AfterTaxesOnDistributionsMember
2016-04-29
2026-04-29
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:C000166451Member
oef:AfterTaxesOnDistributionsAndSalesMember
2025-04-29
2026-04-29
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:C000166451Member
oef:AfterTaxesOnDistributionsAndSalesMember
2021-04-29
2026-04-29
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:C000166451Member
oef:AfterTaxesOnDistributionsAndSalesMember
2016-04-29
2026-04-29
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:IndexLB009Member
2025-04-29
2026-04-29
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:IndexLB009Member
2021-04-29
2026-04-29
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:IndexLB009Member
2016-04-29
2026-04-29
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:IndexLB001Member
2025-04-29
2026-04-29
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:IndexLB001Member
2021-04-29
2026-04-29
0000035315
fmr:FidelitySAIUSTreasuryBondIndexFund-PROMember
fmr:S000052911Member
fmr:IndexLB001Member
2016-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
2026-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:C000194654Member
2026-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:InterestRateChangesMember
2026-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:IssuerSpecificChangesMember
2026-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:USTreasuryObligationsMember
2026-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:CorrelationToIndexMember
2026-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:PassiveManagementRiskMember
2026-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
oef:RiskNotInsuredDepositoryInstitutionMember
2026-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
oef:RiskLoseMoneyMember
2026-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:C000194654Member
2016-01-01
2016-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:C000194654Member
2017-01-01
2017-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:C000194654Member
2018-01-01
2018-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:C000194654Member
2019-01-01
2019-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:C000194654Member
2020-01-01
2020-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:C000194654Member
2021-01-01
2021-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:C000194654Member
2022-01-01
2022-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:C000194654Member
2023-01-01
2023-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:C000194654Member
2024-01-01
2024-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:C000194654Member
2025-01-01
2025-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:C000194654Member
2025-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:C000194654Member
2021-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:C000194654Member
2016-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:C000194654Member
oef:AfterTaxesOnDistributionsMember
2025-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:C000194654Member
oef:AfterTaxesOnDistributionsMember
2021-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:C000194654Member
oef:AfterTaxesOnDistributionsMember
2016-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:C000194654Member
oef:AfterTaxesOnDistributionsAndSalesMember
2025-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:C000194654Member
oef:AfterTaxesOnDistributionsAndSalesMember
2021-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:C000194654Member
oef:AfterTaxesOnDistributionsAndSalesMember
2016-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:IndexLB143Member
2025-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:IndexLB143Member
2021-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:IndexLB143Member
2016-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:IndexLB001Member
2025-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:IndexLB001Member
2021-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017677Member
fmr:IndexLB001Member
2016-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
2026-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:C000194656Member
2026-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:InterestRateChangesMember
2026-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:IssuerSpecificChangesMember
2026-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:USTreasuryObligationsMember
2026-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:CorrelationToIndexMember
2026-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:PassiveManagementRiskMember
2026-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
oef:RiskNotInsuredDepositoryInstitutionMember
2026-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
oef:RiskLoseMoneyMember
2026-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:C000194656Member
2016-01-01
2016-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:C000194656Member
2017-01-01
2017-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:C000194656Member
2018-01-01
2018-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:C000194656Member
2019-01-01
2019-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:C000194656Member
2020-01-01
2020-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:C000194656Member
2021-01-01
2021-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:C000194656Member
2022-01-01
2022-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:C000194656Member
2023-01-01
2023-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:C000194656Member
2024-01-01
2024-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:C000194656Member
2025-01-01
2025-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:C000194656Member
2025-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:C000194656Member
2021-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:C000194656Member
2016-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:C000194656Member
oef:AfterTaxesOnDistributionsMember
2025-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:C000194656Member
oef:AfterTaxesOnDistributionsMember
2021-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:C000194656Member
oef:AfterTaxesOnDistributionsMember
2016-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:C000194656Member
oef:AfterTaxesOnDistributionsAndSalesMember
2025-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:C000194656Member
oef:AfterTaxesOnDistributionsAndSalesMember
2021-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:C000194656Member
oef:AfterTaxesOnDistributionsAndSalesMember
2016-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:IndexLB010Member
2025-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:IndexLB010Member
2021-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:IndexLB010Member
2016-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:IndexLB001Member
2025-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:IndexLB001Member
2021-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017678Member
fmr:IndexLB001Member
2016-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
2026-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:C000194658Member
2026-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:InterestRateChangesMember
2026-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:IssuerSpecificChangesMember
2026-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:USTreasuryObligationsMember
2026-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:CorrelationToIndexMember
2026-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:PassiveManagementRiskMember
2026-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
oef:RiskNotInsuredDepositoryInstitutionMember
2026-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
oef:RiskLoseMoneyMember
2026-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:C000194658Member
2016-01-01
2016-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:C000194658Member
2017-01-01
2017-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:C000194658Member
2018-01-01
2018-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:C000194658Member
2019-01-01
2019-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:C000194658Member
2020-01-01
2020-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:C000194658Member
2021-01-01
2021-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:C000194658Member
2022-01-01
2022-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:C000194658Member
2023-01-01
2023-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:C000194658Member
2024-01-01
2024-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:C000194658Member
2025-01-01
2025-12-31
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:C000194658Member
2025-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:C000194658Member
2021-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:C000194658Member
2016-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:C000194658Member
oef:AfterTaxesOnDistributionsMember
2025-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:C000194658Member
oef:AfterTaxesOnDistributionsMember
2021-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:C000194658Member
oef:AfterTaxesOnDistributionsMember
2016-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:C000194658Member
oef:AfterTaxesOnDistributionsAndSalesMember
2025-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:C000194658Member
oef:AfterTaxesOnDistributionsAndSalesMember
2021-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:C000194658Member
oef:AfterTaxesOnDistributionsAndSalesMember
2016-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:IndexLB154Member
2025-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:IndexLB154Member
2021-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:IndexLB154Member
2016-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:IndexLB001Member
2025-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:IndexLB001Member
2021-04-29
2026-04-29
0000035315
fmr:FidelityIntermediateLong-TermandShort-TermTreasuryBondIndexFunds-ComboPROMember
fmr:S000017679Member
fmr:IndexLB001Member
2016-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086561Member
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086561Member
fmr:C000252149Member
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086561Member
fmr:InterestRateChangesMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086561Member
fmr:IssuerSpecificChangesMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086561Member
fmr:USTreasuryObligationsMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086561Member
fmr:CorrelationToIndexMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086561Member
fmr:PassiveManagementRiskMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086561Member
oef:RiskNotInsuredDepositoryInstitutionMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086561Member
oef:RiskLoseMoneyMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086561Member
fmr:C000252149Member
2025-01-01
2025-12-31
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086561Member
fmr:C000252149Member
2025-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086561Member
fmr:C000252149Member
2024-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086561Member
fmr:C000252149Member
oef:AfterTaxesOnDistributionsMember
2025-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086561Member
fmr:C000252149Member
oef:AfterTaxesOnDistributionsMember
2024-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086561Member
fmr:C000252149Member
oef:AfterTaxesOnDistributionsAndSalesMember
2025-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086561Member
fmr:C000252149Member
oef:AfterTaxesOnDistributionsAndSalesMember
2024-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086561Member
fmr:IndexLB143Member
2025-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086561Member
fmr:IndexLB143Member
2024-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086561Member
fmr:IndexLB001Member
2025-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086561Member
fmr:IndexLB001Member
2024-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086562Member
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086562Member
fmr:C000252150Member
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086562Member
fmr:InterestRateChangesMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086562Member
fmr:IssuerSpecificChangesMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086562Member
fmr:USTreasuryObligationsMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086562Member
fmr:CorrelationToIndexMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086562Member
fmr:PassiveManagementRiskMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086562Member
oef:RiskNotInsuredDepositoryInstitutionMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086562Member
oef:RiskLoseMoneyMember
2026-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086562Member
fmr:C000252150Member
2025-01-01
2025-12-31
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086562Member
fmr:C000252150Member
2025-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086562Member
fmr:C000252150Member
2024-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086562Member
fmr:C000252150Member
oef:AfterTaxesOnDistributionsMember
2025-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086562Member
fmr:C000252150Member
oef:AfterTaxesOnDistributionsMember
2024-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086562Member
fmr:C000252150Member
oef:AfterTaxesOnDistributionsAndSalesMember
2025-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086562Member
fmr:C000252150Member
oef:AfterTaxesOnDistributionsAndSalesMember
2024-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086562Member
fmr:IndexLB154Member
2025-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086562Member
fmr:IndexLB154Member
2024-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086562Member
fmr:IndexLB001Member
2025-04-29
2026-04-29
0000035315
fmr:FidelitySAIIntermediateTreasuryBondIndexFundFidelitySAIShort-TermTreasuryBondIndexFundProMember
fmr:S000086562Member
fmr:IndexLB001Member
2024-04-29
2026-04-29
iso4217:USD
pure
485BPOS
2026-04-29
false
0000035315
N-1A
Fidelity Salem Street Trust
Fund Summary
Fund:
Fidelity® Series Long-Term Treasury Bond Index Fund
Investment Objective
Fidelity® Series Long-Term Treasury Bond Index Fund seeks a high level of current income.
Fee Table
The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund.
Shareholder fees
0
Annual Operating Expenses
0.0000
0
0.0000
0.0000
This
example
helps compare the cost of investing in the fund with the cost of investing in other funds.
Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:
0
0
0
0
Portfolio Turnover
The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was
20
% of the average value of its portfolio.
0.20
Principal Investment Strategies
Normally investing at least 80% of assets in securities included in the Bloomberg U.S. Long Treasury Bond Index.
The
Bloomberg U.S. Long Treasury Bond Index is a market value-weighted index of investment-grade fixed-rate public obligations of the U.S. Treasury with maturities of ten years or more.
Derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives.
Normally maintaining a dollar-weighted average maturity that generally is expected to be 10 years or more, consistent with that of the index.
Using statistical sampling techniques based on duration, maturity, interest rate sensitivity, security structure, and credit quality to attempt to replicate the returns of the Bloomberg U.S. Long Treasury Bond Index using a smaller number of securities.
Interest Rate Changes.
Interest rate increases can cause the price of a debt security to decrease.
Issuer-Specific Changes.
The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole.
A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease.
U.S. Treasury Obligations.
U.S. Treasury obligations are high-quality securities issued or guaranteed by the U.S. Treasury providing minimal risk of loss of principal if held to maturity. Fluctuations in interest rates may cause the market value of such securities to vary.
Correlation to Index.
The performance of the fund and its underlying index may vary somewhat due to factors such as fees and expenses of the fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on the fund and its shareholders.
Passive Management Risk.
The fund is managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of the fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the fund's performance could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers.
An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency
.
You could lose money by investing in the fund.
Performance
The following information is intended to help you understand the risks of investing in the fund.
The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.
The additional index has characteristics relevant to the fund's investment strategies. Index descriptions appear
in the "Additional Index Information" section of the prospectus.
Past performance (before and after taxes) is not an indication of future performance.
The performance shown does not reflect the impact of any fees paid at the fee-based account or plan level, if applicable.
Visit
www.fidelity.com
for more recent performance information.
The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.
Past performance (before and after taxes) is not an indication of future performance.
www.fidelity.com
Year-by-Year Returns
0.0847
-0.0165
0.1427
0.1763
-0.0483
-0.2941
0.0324
-0.0614
0.0544
Highest Quarter Return
0.2202
2020-03-31
Lowest Quarter Return
-0.1341
2021-03-31
Year-to-Date Return
-0.0016
2026-03-31
Average Annual Returns
After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.
Actual after-tax returns may differ depending on your individual circumstances.
The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).
Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.
After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.
The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).
Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.
Return Before Taxes
0.0544
-0.0725
Return After Taxes on Distributions
0.0382
-0.0840
Return After Taxes on Distributions and Sale of Fund Shares
0.0321
-0.0572
Bloomberg U.S. Long Treasury Bond Index
0.0559
-0.0723
-0.0176
Bloomberg U.S. Aggregate Bond Index
0.0730
-0.0036
0.0149
2016-07-07
Fund Summary
Fund:
Fidelity® SAI Long-Term Treasury Bond Index Fund
Investment Objective
Fidelity® SAI Long-Term Treasury Bond Index Fund seeks a high level of current income.
Fee Table
The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund.
Shareholder fees
0
Annual Operating Expenses
0.0004
0
0.0001
0.0005
0.0003
2027-06-30
This
example
helps compare the cost of investing in the fund with the cost of investing in other funds.
Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:
3
13
26
62
Portfolio Turnover
The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was
25
% of the average value of its portfolio.
0.25
Principal Investment Strategies
Normally investing at least 80% of assets in securities included in the Bloomberg U.S. 20+ Year Treasury Bond Index.
The
Bloomberg U.S. 20+ Year Treasury Bond Index is a market value-weighted index of investment-grade fixed-rate public obligations of the U.S. Treasury with maturities equal to or greater than 20 years.
Derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives.
Normally maintaining a dollar-weighted average maturity that is generally expected to be 20 years or more, consistent with that of the index.
Using statistical sampling techniques based on duration, maturity, interest rate sensitivity, security structure, and credit quality to attempt to replicate the returns of the Bloomberg U.S. 20+ Year Treasury Bond Index using a smaller number of securities.
Interest Rate Changes.
Interest rate increases can cause the price of a debt security to decrease.
Issuer-Specific Changes.
The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole.
A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease.
U.S. Treasury Obligations.
U.S. Treasury obligations are high-quality securities issued or guaranteed by the U.S. Treasury providing minimal risk of loss of principal if held to maturity. Fluctuations in interest rates may cause the market value of such securities to vary.
Correlation to Index.
The performance of the fund and its underlying index may vary somewhat due to factors such as fees and expenses of the fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on the fund and its shareholders.
Passive Management Risk.
The fund is managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of the fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the fund's performance could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers.
An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency
.
You could lose money by investing in the fund.
Performance
The following information is intended to help you understand the risks of investing in the fund.
The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.
The additional index has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus.
Past performance (before and after taxes) is not an indication of future performance.
Visit
www.fidelity.com
for more recent performance information.
The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.
Past performance (before and after taxes) is not an indication of future performance.
www.fidelity.com
Year-by-Year Returns
0.0123
0.0904
-0.0124
0.1435
0.1834
-0.0461
-0.3139
0.0269
-0.0778
0.0438
Highest Quarter Return
0.2288
2020-03-31
Lowest Quarter Return
-0.1380
2021-03-31
Year-to-Date Return
0.0012
2026-03-31
Average Annual Returns
After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.
Actual after-tax returns may differ depending on your individual circumstances.
The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).
Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.
After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.
The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).
Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.
Return Before Taxes
0.0438
-0.0834
-0.0047
Return After Taxes on Distributions
0.0270
-0.0948
-0.0180
Return After Taxes on Distributions and Sale of Fund Shares
0.0259
-0.0645
-0.0079
Bloomberg U.S. 20+ Year Treasury Bond Index
0.0459
-0.0822
-0.0042
Bloomberg U.S. Aggregate Bond Index
0.0730
-0.0036
0.0201
Fund Summary
Fund:
Fidelity® SAI U.S. Treasury Bond Index Fund
Investment Objective
Fidelity® SAI U.S. Treasury Bond Index Fund seeks to provide investment results that correspond to the total return of U.S. treasury bonds.
Fee Table
The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund.
Shareholder fees
0
Annual Operating Expenses
0.0004
0
0.0000
0.0004
0.0003
2027-06-30
This
example
helps compare the cost of investing in the fund with the cost of investing in other funds.
Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:
3
12
21
50
Portfolio Turnover
The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was
26
% of the average value of its portfolio.
0.26
Principal Investment Strategies
Normally investing at least 80% of assets in debt securities included in the Bloomberg U.S. Treasury Index.
The
Bloomberg U.S. Treasury Index is a market value-weighted index of public obligations of the U.S. Treasury with maturities of one year or more.
Derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives.
Normally maintaining a dollar-weighted average maturity of one year or more.
Using statistical sampling techniques based on duration, maturity, interest rate sensitivity, security structure, and credit quality to attempt to replicate the returns of the Bloomberg U.S. Treasury Index using a smaller number of securities.
Interest Rate Changes.
Interest rate increases can cause the price of a debt security to decrease.
Issuer-Specific Changes.
The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole.
A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease.
U.S. Treasury Obligations.
U.S. Treasury obligations are high-quality securities issued or guaranteed by the U.S. Treasury providing minimal risk of loss of principal if held to maturity. Fluctuations in interest rates may cause the market value of such securities to vary.
Correlation to Index.
The performance of the fund and its underlying index may vary somewhat due to factors such as fees and expenses of the fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on the fund and its shareholders.
Passive Management Risk.
The fund is managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of the fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the fund's performance could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers.
An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency
.
You could lose money by investing in the fund.
Performance
The following information is intended to help you understand the risks of investing in the fund.
The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.
The additional index has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus.
Past performance (before and after taxes) is not an indication of future performance.
Visit
www.fidelity.com
for more recent performance information.
The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.
Past performance (before and after taxes) is not an indication of future performance.
www.fidelity.com
Year-by-Year Returns
0.0227
0.0095
0.0664
0.0798
-0.0240
-0.1265
0.0418
0.0072
0.0612
Highest Quarter Return
0.0854
2020-03-31
Lowest Quarter Return
-0.0542
2022-03-31
Year-to-Date Return
0.0014
2026-03-31
Average Annual Returns
After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.
Actual after-tax returns may differ depending on your individual circumstances.
The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).
Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.
After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.
The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).
Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.
Return Before Taxes
0.0612
-0.0104
Return After Taxes on Distributions
0.0465
-0.0191
Return After Taxes on Distributions and Sale of Fund Shares
0.0361
-0.0116
Bloomberg U.S. Treasury Index
0.0632
-0.0099
0.0113
Bloomberg U.S. Aggregate Bond Index
0.0730
-0.0036
0.0186
2016-03-01
Fund Summary
Fund:
Fidelity® Intermediate Treasury Bond Index Fund
Investment Objective
Fidelity® Intermediate Treasury Bond Index Fund seeks a high level of current income.
Fee Table
The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions, which are not reflected in the tables and examples below.
Shareholder fees
0
Annual Operating Expenses
0.0003
0
0.0000
0.0003
This
example
helps compare the cost of investing in the fund with the cost of investing in other funds.
Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:
3
10
17
39
Portfolio Turnover
The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was
40
% of the average value of its portfolio.
0.40
Principal Investment Strategies
Normally investing at least 80% of assets in securities included in the Bloomberg U.S. 5-10 Year Treasury Bond Index.
The
Bloomberg U.S. 5-10 Year Treasury Bond Index is a market value-weighted index of investment-grade fixed-rate public obligations of the U.S. Treasury with maturities between five and ten years.
Derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives.
Normally maintaining a dollar-weighted average maturity that generally is expected to be between five and 10 years, consistent with that of the index.
Using statistical sampling techniques based on duration, maturity, interest rate sensitivity, security structure, and credit quality to attempt to replicate the returns of the Bloomberg U.S. 5-10 Year Treasury Bond Index using a smaller number of securities.
Interest Rate Changes.
Interest rate increases can cause the price of a debt security to decrease.
Issuer-Specific Changes.
The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole.
A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease.
U.S. Treasury Obligations.
U.S. Treasury obligations are high-quality securities issued or guaranteed by the U.S. Treasury providing minimal risk of loss of principal if held to maturity. Fluctuations in interest rates may cause the market value of such securities to vary.
Correlation to Index.
The performance of the fund and its underlying index may vary somewhat due to factors such as fees and expenses of the fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on the fund and its shareholders.
Passive Management Risk.
The fund is managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of the fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the fund's performance could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers.
An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency
.
You could lose money by investing in the fund.
Performance
The following information is intended to help you understand the risks of investing in the fund.
The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.
The additional index has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus.
Past performance (before and after taxes) is not an indication of future performance.
Visit
www.fidelity.com
for more recent performance information.
The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.
Past performance (before and after taxes) is not an indication of future performance.
www.fidelity.com
Year-by-Year Returns
0.0096
0.0228
0.0124
0.0725
0.0910
-0.0300
-0.1273
0.0406
0.0040
0.0799
Highest Quarter Return
0.0891
2020-03-31
Lowest Quarter Return
-0.0597
2022-03-31
Year-to-Date Return
-0.0005
2026-03-31
* The initial offering of Fidelity® Intermediate Treasury Bond Index Fund (formerly Institutional Premium Class) took place on October 4, 2017. Returns prior to October 4, 2017 are those of the former Premium Class and have not been restated to reflect current fees.
Average Annual Returns
After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.
Actual after-tax returns may differ depending on your individual circumstances.
The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).
Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.
After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.
The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).
Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.
Return Before Taxes
0.0799
-0.0091
0.0157
Return After Taxes on Distributions
0.0644
-0.0189
0.0058
Return After Taxes on Distributions and Sale of Fund Shares
0.0471
-0.0108
0.0081
Bloomberg U.S. 5-10 Year Treasury Bond Index
0.0818
-0.0086
0.0162
Bloomberg U.S. Aggregate Bond Index
0.0730
-0.0036
0.0201
* The initial offering of Fidelity® Intermediate Treasury Bond Index Fund (formerly Institutional Premium Class) took place on October 4, 2017. Returns prior to October 4, 2017 are those of the former Premium Class and have not been restated to reflect current fees.
Fund Summary
Fund:
Fidelity® Long-Term Treasury Bond Index Fund
Investment Objective
Fidelity® Long-Term Treasury Bond Index Fund seeks a high level of current income.
Fee Table
The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions, which are not reflected in the tables and examples below.
Shareholder fees
0
Annual Operating Expenses
0.0003
0
0.0000
0.0003
This
example
helps compare the cost of investing in the fund with the cost of investing in other funds.
Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:
3
10
17
39
Portfolio Turnover
The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was
25
% of the average value of its portfolio.
0.25
Principal Investment Strategies
Normally investing at least 80% of assets in securities included in the Bloomberg U.S. Long Treasury Bond Index.
The
Bloomberg U.S. Long Treasury Bond Index is a market value-weighted index of investment-grade fixed-rate public obligations of the U.S. Treasury with maturities of ten years or more.
Derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives.
Normally maintaining a dollar-weighted average maturity that generally is expected to be 10 years or more, consistent with that of the index.
Using statistical sampling techniques based on duration, maturity, interest rate sensitivity, security structure, and credit quality to attempt to replicate the returns of the Bloomberg U.S. Long Treasury Bond Index using a smaller number of securities.
Interest Rate Changes.
Interest rate increases can cause the price of a debt security to decrease.
Issuer-Specific Changes.
The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole.
A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease.
U.S. Treasury Obligations.
U.S. Treasury obligations are high-quality securities issued or guaranteed by the U.S. Treasury providing minimal risk of loss of principal if held to maturity. Fluctuations in interest rates may cause the market value of such securities to vary.
Correlation to Index.
The performance of the fund and its underlying index may vary somewhat due to factors such as fees and expenses of the fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on the fund and its shareholders.
Passive Management Risk.
The fund is managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of the fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the fund's performance could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers.
An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency
.
You could lose money by investing in the fund.
Performance
The following information is intended to help you understand the risks of investing in the fund.
The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.
The additional index has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus.
Past performance (before and after taxes) is not an indication of future performance.
Visit
www.fidelity.com
for more recent performance information.
The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.
Past performance (before and after taxes) is not an indication of future performance.
www.fidelity.com
Year-by-Year Returns
0.0112
0.0859
-0.0163
0.1422
0.1781
-0.0486
-0.2942
0.0318
-0.0618
0.0529
Highest Quarter Return
0.2224
2020-03-31
Lowest Quarter Return
-0.1340
2021-03-31
Year-to-Date Return
0.0000
2026-03-31
* The initial offering of Fidelity® Long-Term Treasury Bond Index Fund (formerly named Institutional Premium Class) took place on October 4, 2017. Returns prior to October 4, 2017 are those of the former Premium Class and have not been restated to reflect current fees.
Average Annual Returns
After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.
Actual after-tax returns may differ depending on your individual circumstances.
The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).
Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.
After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.
The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).
Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.
Return Before Taxes
0.0529
-0.0730
-0.0005
Return After Taxes on Distributions
0.0365
-0.0849
-0.0129
Return After Taxes on Distributions and Sale of Fund Shares
0.0312
-0.0576
-0.0046
Bloomberg U.S. Long Treasury Bond Index
0.0559
-0.0723
0.0002
Bloomberg U.S. Aggregate Bond Index
0.0730
-0.0036
0.0201
* The initial offering of Fidelity® Long-Term Treasury Bond Index Fund (formerly named Institutional Premium Class) took place on October 4, 2017. Returns prior to October 4, 2017 are those of the former Premium Class and have not been restated to reflect current fees.
Fund Summary
Fund:
Fidelity® Short-Term Treasury Bond Index Fund
Investment Objective
Fidelity® Short-Term Treasury Bond Index Fund seeks a high level of current income in a manner consistent with preservation of capital.
Fee Table
The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions, which are not reflected in the tables and examples below.
Shareholder fees
0
Annual Operating Expenses
0.0003
0
0.0000
0.0003
This
example
helps compare the cost of investing in the fund with the cost of investing in other funds.
Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:
3
10
17
39
Portfolio Turnover
The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was
35
% of the average value of its portfolio.
0.35
Principal Investment Strategies
Normally investing at least 80% of assets in securities included in the Bloomberg U.S. 1-5 Year Treasury Bond Index.
The
Bloomberg U.S. 1-5 Year Treasury Bond Index is a market value-weighted index of investment-grade fixed-rate public obligations of the U.S. Treasury with maturities between one and five years.
Derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives.
Normally maintaining a dollar-weighted average maturity that generally is expected to be three years or less, consistent with that of the index.
Using statistical sampling techniques based on duration, maturity, interest rate sensitivity, security structure, and credit quality to attempt to replicate the returns of the Bloomberg U.S. 1-5 Year Treasury Bond Index using a smaller number of securities.
Interest Rate Changes.
Interest rate increases can cause the price of a debt security to decrease.
Issuer-Specific Changes.
The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole.
A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease.
U.S. Treasury Obligations.
U.S. Treasury obligations are high-quality securities issued or guaranteed by the U.S. Treasury providing minimal risk of loss of principal if held to maturity. Fluctuations in interest rates may cause the market value of such securities to vary.
Correlation to Index.
The performance of the fund and its underlying index may vary somewhat due to factors such as fees and expenses of the fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on the fund and its shareholders.
Passive Management Risk.
The fund is managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of the fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the fund's performance could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers.
An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency
.
You could lose money by investing in the fund.
Performance
The following information is intended to help you understand the risks of investing in the fund.
The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.
The additional index has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus.
Past performance (before and after taxes) is not an indication of future performance.
Visit
www.fidelity.com
for more recent performance information.
The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.
Past performance (before and after taxes) is not an indication of future performance.
www.fidelity.com
Year-by-Year Returns
0.0087
0.0067
0.0147
0.0419
0.0440
-0.0125
-0.0561
0.0447
0.0325
0.0582
Highest Quarter Return
0.0396
2020-03-31
Lowest Quarter Return
-0.0342
2022-03-31
Year-to-Date Return
0.0016
2026-03-31
* The initial offering of Fidelity® Short-Term Treasury Bond Index Fund (formerly named Institutional Premium Class) took place on October 4, 2017. Returns prior to October 4, 2017 are those of the former Premium Class and have not been restated to reflect current fees.
Average Annual Returns
After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.
Actual after-tax returns may differ depending on your individual circumstances.
The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).
Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.
After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.
The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).
Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.
Return Before Taxes
0.0582
0.0125
0.0178
Return After Taxes on Distributions
0.0432
0.0041
0.0105
Return After Taxes on Distributions and Sale of Fund Shares
0.0343
0.0060
0.0105
Bloomberg U.S. 1-5 Year Treasury Bond Index
0.0584
0.0128
0.0182
Bloomberg U.S. Aggregate Bond Index
0.0730
-0.0036
0.0201
* The initial offering of Fidelity® Short-Term Treasury Bond Index Fund (formerly named Institutional Premium Class) took place on October 4, 2017. Returns prior to October 4, 2017 are those of the former Premium Class and have not been restated to reflect current fees.
Fund Summary
Fund:
Fidelity® SAI Intermediate Treasury Bond Index Fund
Investment Objective
Fidelity® SAI Intermediate Treasury Bond Index Fund seeks a high level of current income.
Fee Table
The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund.
Shareholder fees
0
Annual Operating Expenses
0.0003
0
0.0001
0.0004
0.0003
2027-06-30
This
example
helps compare the cost of investing in the fund with the cost of investing in other funds.
Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:
3
12
21
50
Portfolio Turnover
The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was
43
% of the average value of its portfolio.
0.43
Principal Investment Strategies
Normally investing at least 80% of assets in securities included in the Bloomberg U.S. 5-10 Year Treasury Bond Index.
The
Bloomberg U.S. 5-10 Year Treasury Bond Index is a market value-weighted index of investment-grade fixed-rate public obligations of the U.S. Treasury with maturities between five and ten years.
Derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives.
Normally maintaining a dollar-weighted average maturity that generally is expected to be between five and ten years, consistent with that of the index.
Using statistical sampling techniques based on duration, maturity, interest rate sensitivity, security structure, and credit quality to attempt to replicate the returns of the Bloomberg U.S. 5-10 Year Treasury Bond Index using a smaller number of securities.
Interest Rate Changes.
Interest rate increases can cause the price of a debt security to decrease.
Issuer-Specific Changes.
The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole.
A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease.
U.S. Treasury Obligations.
U.S. Treasury obligations are high-quality securities issued or guaranteed by the U.S. Treasury providing minimal risk of loss of principal if held to maturity. Fluctuations in interest rates may cause the market value of such securities to vary.
Correlation to Index.
The performance of the fund and its underlying index may vary somewhat due to factors such as fees and expenses of the fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on the fund and its shareholders.
Passive Management Risk.
The fund is managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of the fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the fund's performance could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers.
An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency
.
You could lose money by investing in the fund.
Performance
The following information is intended to help you understand the risks of investing in the fund.
The information illustrates the performance of the fund's shares over the past year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.
The additional index has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus.
Past performance (before and after taxes) is not an indication of future performance.
Visit
www.fidelity.com
for more recent performance information.
The information illustrates the performance of the fund's shares over the past year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.
Past performance (before and after taxes) is not an indication of future performance.
www.fidelity.com
Year-by-Year Returns
0.0795
Highest Quarter Return
0.0353
2025-03-31
Lowest Quarter Return
0.0104
2025-12-31
Year-to-Date Return
-0.0004
2026-03-31
Average Annual Returns
After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.
Actual after-tax returns may differ depending on your individual circumstances.
The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).
Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares
.
After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.
The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).
Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares
.
Return Before Taxes
0.0795
Return After Taxes on Distributions
0.0650
Return After Taxes on Distributions and Sale of Fund Shares
0.0469
Bloomberg U.S. 5-10 Year Treasury Bond Index
0.0818
0.0288
Bloomberg U.S. Aggregate Bond Index
0.0730
0.0293
2024-09-20
Fund Summary
Fund:
Fidelity® SAI Short-Term Treasury Bond Index Fund
Investment Objective
Fidelity® SAI Short-Term Treasury Bond Index Fund seeks a high level of current income in a manner consistent with preservation of capital.
Fee Table
The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund.
Shareholder fees
0
Annual Operating Expenses
0.0003
0
0.0004
0.0007
0.0003
2027-06-30
This
example
helps compare the cost of investing in the fund with the cost of investing in other funds.
Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:
3
17
34
84
Portfolio Turnover
The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was
84
% of the average value of its portfolio.
0.84
Principal Investment Strategies
Normally investing at least 80% of assets in securities included in the Bloomberg U.S. 1-5 Year Treasury Bond Index.
The
Bloomberg U.S. 1-5 Year Treasury Bond Index is a market value-weighted index of investment-grade fixed-rate public obligations of the U.S. Treasury with maturities between one and five years.
Derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives.
Normally maintaining a dollar-weighted average maturity that generally is expected to be three years or less, consistent with that of the index.
Using statistical sampling techniques based on duration, maturity, interest rate sensitivity, security structure, and credit quality to attempt to replicate the returns of the Bloomberg U.S. 1-5 Year Treasury Bond Index using a smaller number of securities.
Interest Rate Changes.
Interest rate increases can cause the price of a debt security to decrease.
Issuer-Specific Changes.
The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole.
A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease.
U.S. Treasury Obligations.
U.S. Treasury obligations are high-quality securities issued or guaranteed by the U.S. Treasury providing minimal risk of loss of principal if held to maturity. Fluctuations in interest rates may cause the market value of such securities to vary.
Correlation to Index.
The performance of the fund and its underlying index may vary somewhat due to factors such as fees and expenses of the fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on the fund and its shareholders.
Passive Management Risk.
The fund is managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of the fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the fund's performance could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers.
An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency
.
You could lose money by investing in the fund.
Performance
The following information is intended to help you understand the risks of investing in the fund.
The information illustrates the performance of the fund's shares over the past year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.
The additional index has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus.
Past performance (before and after taxes) is not an indication of future performance.
Visit
www.fidelity.com
for more recent performance information.
The information illustrates the performance of the fund's shares over the past year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.
Past performance (before and after taxes) is not an indication of future performance.
www.fidelity.com
Year-by-Year Returns
0.0581
Highest Quarter Return
0.0206
2025-03-31
Lowest Quarter Return
0.0109
2025-12-31
Year-to-Date Return
0.0020
2026-03-31
Average Annual Returns
After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.
Actual after-tax returns may differ depending on your individual circumstances.
The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).
Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares
.
After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.
The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).
Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares
.
Return Before Taxes
0.0581
Return After Taxes on Distributions
0.0450
Return After Taxes on Distributions and Sale of Fund Shares
0.0342
Bloomberg U.S. 1-5 Year Treasury Bond Index
0.0584
0.0378
Bloomberg U.S. Aggregate Bond Index
0.0730
0.0293
2024-09-20