v3.25.0.1
Average Annual Total Returns - FidelitySeriesInternationalDevelopedMarketsBondIndexFund-PRO - FidelitySeriesInternationalDevelopedMarketsBondIndexFund-PRO - Fidelity Series International Developed Markets Bond Index Fund
Mar. 01, 2025
Fidelity Series International Developed Markets Bond Index Fund | Return Before Taxes  
Average Annual Return:  
Past 1 year 2.91%
Since Inception (1.76%) [1]
Fidelity Series International Developed Markets Bond Index Fund | After Taxes on Distributions  
Average Annual Return:  
Past 1 year 1.46%
Since Inception (2.73%) [1]
Fidelity Series International Developed Markets Bond Index Fund | After Taxes on Distributions and Sales  
Average Annual Return:  
Past 1 year 1.74%
Since Inception (1.74%) [1]
IXW82  
Average Annual Return:  
Past 1 year 2.95%
Since Inception (1.57%)
LB135  
Average Annual Return:  
Past 1 year (1.69%)
Since Inception (4.79%)
[1]
A From August 31, 2021 .