Expense Example {- Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund} - 12.31 Fidelity Series 0-5 & 5+ Year Inflation-Protected Bond Index Funds Series Combo PRO -02 - Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund - Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund	Mar. 01, 2022 USD ($)
Expense Example:
1 year	none
3 years	none