v3.25.1
Annual Operating Expenses - FidelitySeriesLong-TermTreasuryBondIndexFund-PRO - FidelitySeriesLong-TermTreasuryBondIndexFund-PRO - Fidelity Series Long-Term Treasury Bond Index Fund - Fidelity Series Long-Term Treasury Bond Index Fund
Apr. 29, 2025
Operating Expenses:  
Management fee none
Distribution and/or Service (12b-1) fees none
Other expenses none
Total annual operating expenses none