v3.26.3
Shareholder Report, Holdings (Details)
Jul. 31, 2026
Fidelity Tax-Free Bond Fund | TS0Member  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
Fidelity Tax-Free Bond Fund | TS1Member  
Holdings [Line Items]  
Percent of Net Asset Value 10.30%
Fidelity Tax-Free Bond Fund | TS2Member  
Holdings [Line Items]  
Percent of Net Asset Value 8.90%
Fidelity Tax-Free Bond Fund | TS3Member  
Holdings [Line Items]  
Percent of Net Asset Value 8.80%
Fidelity Tax-Free Bond Fund | TS4Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
Fidelity Tax-Free Bond Fund | RS0Member  
Holdings [Line Items]  
Percent of Net Asset Value 43.00%
Fidelity Tax-Free Bond Fund | RS1Member  
Holdings [Line Items]  
Percent of Net Asset Value 12.70%
Fidelity Tax-Free Bond Fund | RS2Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.20%
Fidelity Tax-Free Bond Fund | RS3Member  
Holdings [Line Items]  
Percent of Net Asset Value 8.70%
Fidelity Tax-Free Bond Fund | RS4Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.90%
Fidelity Tax-Free Bond Fund | RS5Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
Fidelity Tax-Free Bond Fund | RS6Member  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
Fidelity Tax-Free Bond Fund | QDAAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
Fidelity Tax-Free Bond Fund | QDAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 41.50%
Fidelity Tax-Free Bond Fund | QDAMember  
Holdings [Line Items]  
Percent of Net Asset Value 38.90%
Fidelity Tax-Free Bond Fund | QDBBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
Fidelity Tax-Free Bond Fund | QDBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
Fidelity Tax-Free Bond Fund | QDBMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
Fidelity Tax-Free Bond Fund | QDNotRatedMember  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Fidelity Tax-Free Bond Fund | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Fidelity Sustainable Intermediate Municipal Income Fund | TS0Member  
Holdings [Line Items]  
Percent of Net Asset Value 15.70%
Fidelity Sustainable Intermediate Municipal Income Fund | TS1Member  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
Fidelity Sustainable Intermediate Municipal Income Fund | TS2Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.70%
Fidelity Sustainable Intermediate Municipal Income Fund | TS3Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
Fidelity Sustainable Intermediate Municipal Income Fund | TS4Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
Fidelity Sustainable Intermediate Municipal Income Fund | RS0Member  
Holdings [Line Items]  
Percent of Net Asset Value 39.90%
Fidelity Sustainable Intermediate Municipal Income Fund | RS1Member  
Holdings [Line Items]  
Percent of Net Asset Value 15.40%
Fidelity Sustainable Intermediate Municipal Income Fund | RS2Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.10%
Fidelity Sustainable Intermediate Municipal Income Fund | RS3Member  
Holdings [Line Items]  
Percent of Net Asset Value 10.20%
Fidelity Sustainable Intermediate Municipal Income Fund | RS4Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
Fidelity Sustainable Intermediate Municipal Income Fund | RS5Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
Fidelity Sustainable Intermediate Municipal Income Fund | RS6Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
Fidelity Sustainable Intermediate Municipal Income Fund | RS7Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.40%
Fidelity Sustainable Intermediate Municipal Income Fund | QDAAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 15.00%
Fidelity Sustainable Intermediate Municipal Income Fund | QDAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 51.20%
Fidelity Sustainable Intermediate Municipal Income Fund | QDAMember  
Holdings [Line Items]  
Percent of Net Asset Value 26.20%
Fidelity Sustainable Intermediate Municipal Income Fund | QDBBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
Fidelity Sustainable Intermediate Municipal Income Fund | QDBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
Fidelity Sustainable Intermediate Municipal Income Fund | QDNotRatedMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class Z | TS0Member  
Holdings [Line Items]  
Percent of Net Asset Value 15.70%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class Z | TS1Member  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class Z | TS2Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.70%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class Z | TS3Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class Z | TS4Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class Z | RS0Member  
Holdings [Line Items]  
Percent of Net Asset Value 39.90%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class Z | RS1Member  
Holdings [Line Items]  
Percent of Net Asset Value 15.40%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class Z | RS2Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.10%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class Z | RS3Member  
Holdings [Line Items]  
Percent of Net Asset Value 10.20%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class Z | RS4Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class Z | RS5Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class Z | RS6Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class Z | RS7Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.40%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class Z | QDAAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 15.00%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class Z | QDAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 51.20%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class Z | QDAMember  
Holdings [Line Items]  
Percent of Net Asset Value 26.20%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class Z | QDBBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class Z | QDBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class Z | QDNotRatedMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class M | TS0Member  
Holdings [Line Items]  
Percent of Net Asset Value 15.70%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class M | TS1Member  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class M | TS2Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.70%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class M | TS3Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class M | TS4Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class M | RS0Member  
Holdings [Line Items]  
Percent of Net Asset Value 39.90%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class M | RS1Member  
Holdings [Line Items]  
Percent of Net Asset Value 15.40%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class M | RS2Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.10%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class M | RS3Member  
Holdings [Line Items]  
Percent of Net Asset Value 10.20%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class M | RS4Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class M | RS5Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class M | RS6Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class M | RS7Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.40%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class M | QDAAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 15.00%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class M | QDAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 51.20%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class M | QDAMember  
Holdings [Line Items]  
Percent of Net Asset Value 26.20%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class M | QDBBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class M | QDBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class M | QDNotRatedMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class I | TS0Member  
Holdings [Line Items]  
Percent of Net Asset Value 15.70%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class I | TS1Member  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class I | TS2Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.70%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class I | TS3Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class I | TS4Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class I | RS0Member  
Holdings [Line Items]  
Percent of Net Asset Value 39.90%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class I | RS1Member  
Holdings [Line Items]  
Percent of Net Asset Value 15.40%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class I | RS2Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.10%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class I | RS3Member  
Holdings [Line Items]  
Percent of Net Asset Value 10.20%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class I | RS4Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class I | RS5Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class I | RS6Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class I | RS7Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.40%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class I | QDAAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 15.00%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class I | QDAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 51.20%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class I | QDAMember  
Holdings [Line Items]  
Percent of Net Asset Value 26.20%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class I | QDBBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class I | QDBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class I | QDNotRatedMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class C | TS0Member  
Holdings [Line Items]  
Percent of Net Asset Value 15.70%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class C | TS1Member  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class C | TS2Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.70%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class C | TS3Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class C | TS4Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class C | RS0Member  
Holdings [Line Items]  
Percent of Net Asset Value 39.90%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class C | RS1Member  
Holdings [Line Items]  
Percent of Net Asset Value 15.40%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class C | RS2Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.10%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class C | RS3Member  
Holdings [Line Items]  
Percent of Net Asset Value 10.20%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class C | RS4Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class C | RS5Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class C | RS6Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class C | RS7Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.40%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class C | QDAAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 15.00%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class C | QDAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 51.20%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class C | QDAMember  
Holdings [Line Items]  
Percent of Net Asset Value 26.20%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class C | QDBBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class C | QDBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class C | QDNotRatedMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class A | TS0Member  
Holdings [Line Items]  
Percent of Net Asset Value 15.70%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class A | TS1Member  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class A | TS2Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.70%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class A | TS3Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class A | TS4Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class A | RS0Member  
Holdings [Line Items]  
Percent of Net Asset Value 39.90%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class A | RS1Member  
Holdings [Line Items]  
Percent of Net Asset Value 15.40%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class A | RS2Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.10%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class A | RS3Member  
Holdings [Line Items]  
Percent of Net Asset Value 10.20%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class A | RS4Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class A | RS5Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class A | RS6Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class A | RS7Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.40%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class A | QDAAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 15.00%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class A | QDAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 51.20%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class A | QDAMember  
Holdings [Line Items]  
Percent of Net Asset Value 26.20%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class A | QDBBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class A | QDBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class A | QDNotRatedMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
Fidelity Series Large Cap Value Index Fund | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.60%
Fidelity Series Large Cap Value Index Fund | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
Fidelity Series Large Cap Value Index Fund | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
Fidelity Series Large Cap Value Index Fund | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Fidelity Series Large Cap Value Index Fund | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity Series Large Cap Value Index Fund | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
Fidelity Series Large Cap Value Index Fund | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
Fidelity Series Large Cap Value Index Fund | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
Fidelity Series Large Cap Value Index Fund | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
Fidelity Series Large Cap Value Index Fund | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
Fidelity Series Large Cap Value Index Fund | MSFinancialsSectorMember  
Holdings [Line Items]  
Percent of Net Asset Value 19.40%
Fidelity Series Large Cap Value Index Fund | Information Technology Member  
Holdings [Line Items]  
Percent of Net Asset Value 18.30%
Fidelity Series Large Cap Value Index Fund | Healthcare Sector  
Holdings [Line Items]  
Percent of Net Asset Value 12.60%
Fidelity Series Large Cap Value Index Fund | Real Estate Sector  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Fidelity Series Large Cap Value Index Fund | Industrial Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.10%
Fidelity Series Large Cap Value Index Fund | Materials Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Fidelity Series Large Cap Value Index Fund | Consumer Discretionary Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
Fidelity Series Large Cap Value Index Fund | Consumer Staples Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
Fidelity Series Large Cap Value Index Fund | Communications Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Fidelity Series Large Cap Value Index Fund | Energy Sector  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
Fidelity Series Large Cap Value Index Fund | Utilities Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
Fidelity Series Large Cap Value Index Fund | United States  
Holdings [Line Items]  
Percent of Net Asset Value 99.80%
Fidelity Series Large Cap Value Index Fund | Canada  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Fidelity Series Large Cap Value Index Fund | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Fidelity Series Large Cap Value Index Fund | Australia  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Fidelity Series Large Cap Value Index Fund | Bermuda  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Fidelity Series Large Cap Value Index Fund | Mexico  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Fidelity Series Large Cap Value Index Fund | Puerto Rico  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Fidelity Series Large Cap Value Index Fund | Guatemala  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Fidelity Series Large Cap Value Index Fund | Brazil  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Fidelity Series Large Cap Value Index Fund | AACommonStocksMember  
Holdings [Line Items]  
Percent of Net Asset Value 99.70%
Fidelity Series Large Cap Value Index Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
Fidelity SAI Tax-Free Bond Fund | TS0Member  
Holdings [Line Items]  
Percent of Net Asset Value 12.90%
Fidelity SAI Tax-Free Bond Fund | TS1Member  
Holdings [Line Items]  
Percent of Net Asset Value 12.50%
Fidelity SAI Tax-Free Bond Fund | TS2Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
Fidelity SAI Tax-Free Bond Fund | TS3Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
Fidelity SAI Tax-Free Bond Fund | TS4Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity SAI Tax-Free Bond Fund | RS0Member  
Holdings [Line Items]  
Percent of Net Asset Value 44.00%
Fidelity SAI Tax-Free Bond Fund | RS1Member  
Holdings [Line Items]  
Percent of Net Asset Value 12.10%
Fidelity SAI Tax-Free Bond Fund | RS2Member  
Holdings [Line Items]  
Percent of Net Asset Value 9.50%
Fidelity SAI Tax-Free Bond Fund | RS3Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.20%
Fidelity SAI Tax-Free Bond Fund | RS4Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
Fidelity SAI Tax-Free Bond Fund | RS5Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.50%
Fidelity SAI Tax-Free Bond Fund | RS6Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
Fidelity SAI Tax-Free Bond Fund | RS7Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
Fidelity SAI Tax-Free Bond Fund | QDAAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 6.40%
Fidelity SAI Tax-Free Bond Fund | QDAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 50.00%
Fidelity SAI Tax-Free Bond Fund | QDAMember  
Holdings [Line Items]  
Percent of Net Asset Value 33.40%
Fidelity SAI Tax-Free Bond Fund | QDBBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
Fidelity SAI Tax-Free Bond Fund | QDBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Fidelity SAI Tax-Free Bond Fund | QDBMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity SAI Tax-Free Bond Fund | QDNotRatedMember  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Fidelity SAI Tax-Free Bond Fund | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
Fidelity SAI Sustainable Municipal Income Fund | TS0Member  
Holdings [Line Items]  
Percent of Net Asset Value 12.90%
Fidelity SAI Sustainable Municipal Income Fund | TS1Member  
Holdings [Line Items]  
Percent of Net Asset Value 10.10%
Fidelity SAI Sustainable Municipal Income Fund | TS2Member  
Holdings [Line Items]  
Percent of Net Asset Value 9.40%
Fidelity SAI Sustainable Municipal Income Fund | TS3Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
Fidelity SAI Sustainable Municipal Income Fund | TS4Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
Fidelity SAI Sustainable Municipal Income Fund | RS0Member  
Holdings [Line Items]  
Percent of Net Asset Value 33.80%
Fidelity SAI Sustainable Municipal Income Fund | RS1Member  
Holdings [Line Items]  
Percent of Net Asset Value 18.40%
Fidelity SAI Sustainable Municipal Income Fund | RS2Member  
Holdings [Line Items]  
Percent of Net Asset Value 14.70%
Fidelity SAI Sustainable Municipal Income Fund | RS3Member  
Holdings [Line Items]  
Percent of Net Asset Value 12.20%
Fidelity SAI Sustainable Municipal Income Fund | RS4Member  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
Fidelity SAI Sustainable Municipal Income Fund | RS5Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
Fidelity SAI Sustainable Municipal Income Fund | RS6Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
Fidelity SAI Sustainable Municipal Income Fund | QDAAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 11.60%
Fidelity SAI Sustainable Municipal Income Fund | QDAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 57.10%
Fidelity SAI Sustainable Municipal Income Fund | QDAMember  
Holdings [Line Items]  
Percent of Net Asset Value 25.90%
Fidelity SAI Sustainable Municipal Income Fund | QDBBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
Fidelity SAI Sustainable Municipal Income Fund | QDBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity SAI Sustainable Municipal Income Fund | QDNotRatedMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Fidelity SAI Sustainable Conservative Income Municipal Bond Fund | TS0Member  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
Fidelity SAI Sustainable Conservative Income Municipal Bond Fund | TS1Member  
Holdings [Line Items]  
Percent of Net Asset Value 8.70%
Fidelity SAI Sustainable Conservative Income Municipal Bond Fund | TS2Member  
Holdings [Line Items]  
Percent of Net Asset Value 8.70%
Fidelity SAI Sustainable Conservative Income Municipal Bond Fund | TS3Member  
Holdings [Line Items]  
Percent of Net Asset Value 8.10%
Fidelity SAI Sustainable Conservative Income Municipal Bond Fund | TS4Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
Fidelity SAI Sustainable Conservative Income Municipal Bond Fund | RS0Member  
Holdings [Line Items]  
Percent of Net Asset Value 21.40%
Fidelity SAI Sustainable Conservative Income Municipal Bond Fund | RS1Member  
Holdings [Line Items]  
Percent of Net Asset Value 15.00%
Fidelity SAI Sustainable Conservative Income Municipal Bond Fund | RS2Member  
Holdings [Line Items]  
Percent of Net Asset Value 14.90%
Fidelity SAI Sustainable Conservative Income Municipal Bond Fund | RS3Member  
Holdings [Line Items]  
Percent of Net Asset Value 14.80%
Fidelity SAI Sustainable Conservative Income Municipal Bond Fund | RS4Member  
Holdings [Line Items]  
Percent of Net Asset Value 12.20%
Fidelity SAI Sustainable Conservative Income Municipal Bond Fund | RS5Member  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
Fidelity SAI Sustainable Conservative Income Municipal Bond Fund | RS6Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
Fidelity SAI Sustainable Conservative Income Municipal Bond Fund | RS7Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.70%
Fidelity SAI Sustainable Conservative Income Municipal Bond Fund | QDAAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
Fidelity SAI Sustainable Conservative Income Municipal Bond Fund | QDAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 33.60%
Fidelity SAI Sustainable Conservative Income Municipal Bond Fund | QDAMember  
Holdings [Line Items]  
Percent of Net Asset Value 54.10%
Fidelity SAI Sustainable Conservative Income Municipal Bond Fund | QDBBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
Fidelity SAI Sustainable Conservative Income Municipal Bond Fund | QDNotRatedMember  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
Fidelity SAI Sustainable Conservative Income Municipal Bond Fund | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Fidelity SAI Conservative Income Municipal Bond Fund | TS0Member  
Holdings [Line Items]  
Percent of Net Asset Value 15.00%
Fidelity SAI Conservative Income Municipal Bond Fund | TS1Member  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
Fidelity SAI Conservative Income Municipal Bond Fund | TS2Member  
Holdings [Line Items]  
Percent of Net Asset Value 8.50%
Fidelity SAI Conservative Income Municipal Bond Fund | TS3Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
Fidelity SAI Conservative Income Municipal Bond Fund | TS4Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.40%
Fidelity SAI Conservative Income Municipal Bond Fund | RS0Member  
Holdings [Line Items]  
Percent of Net Asset Value 26.20%
Fidelity SAI Conservative Income Municipal Bond Fund | RS1Member  
Holdings [Line Items]  
Percent of Net Asset Value 17.90%
Fidelity SAI Conservative Income Municipal Bond Fund | RS2Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.10%
Fidelity SAI Conservative Income Municipal Bond Fund | RS3Member  
Holdings [Line Items]  
Percent of Net Asset Value 9.30%
Fidelity SAI Conservative Income Municipal Bond Fund | RS4Member  
Holdings [Line Items]  
Percent of Net Asset Value 8.60%
Fidelity SAI Conservative Income Municipal Bond Fund | RS5Member  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
Fidelity SAI Conservative Income Municipal Bond Fund | RS6Member  
Holdings [Line Items]  
Percent of Net Asset Value 8.20%
Fidelity SAI Conservative Income Municipal Bond Fund | RS7Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
Fidelity SAI Conservative Income Municipal Bond Fund | RS8Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
Fidelity SAI Conservative Income Municipal Bond Fund | QDAAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
Fidelity SAI Conservative Income Municipal Bond Fund | QDAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 31.60%
Fidelity SAI Conservative Income Municipal Bond Fund | QDAMember  
Holdings [Line Items]  
Percent of Net Asset Value 44.50%
Fidelity SAI Conservative Income Municipal Bond Fund | QDBBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
Fidelity SAI Conservative Income Municipal Bond Fund | QDNotRatedMember  
Holdings [Line Items]  
Percent of Net Asset Value 14.30%