v3.25.0.1
Average Annual Total Returns - FidelityFlexConservativeIncomeMunicipalBondFund-PRO - FidelityFlexConservativeIncomeMunicipalBondFund-PRO - Fidelity Flex Conservative Income Municipal Bond Fund
Mar. 01, 2025
Fidelity Flex Conservative Income Municipal Bond Fund | Return Before Taxes  
Average Annual Return:  
Past 1 year 3.53%
Past 5 years 1.95%
Since Inception 1.94% [1]
Fidelity Flex Conservative Income Municipal Bond Fund | After Taxes on Distributions  
Average Annual Return:  
Past 1 year 3.53%
Past 5 years 1.95%
Since Inception 1.93% [1]
Fidelity Flex Conservative Income Municipal Bond Fund | After Taxes on Distributions and Sales  
Average Annual Return:  
Past 1 year 3.53%
Past 5 years 1.95%
Since Inception 1.92% [1]
LB015  
Average Annual Return:  
Past 1 year 1.05%
Past 5 years 0.99%
Since Inception 1.94%
LB319  
Average Annual Return:  
Past 1 year 2.71%
Past 5 years 1.39%
Since Inception 1.49%
IXY1N  
Average Annual Return:  
Past 1 year 3.10%
Past 5 years 1.58%
Since Inception 1.58%
[1]
A From October 12, 2017 .