v3.26.1
Shareholder Report, Holdings (Details)
Jun. 30, 2026
Fidelity Emerging Markets Debt Local Currency Central Fund | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 10.50%
Fidelity Emerging Markets Debt Local Currency Central Fund | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.80%
Fidelity Emerging Markets Debt Local Currency Central Fund | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
Fidelity Emerging Markets Debt Local Currency Central Fund | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
Fidelity Emerging Markets Debt Local Currency Central Fund | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
Fidelity Emerging Markets Debt Local Currency Central Fund | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity Emerging Markets Debt Local Currency Central Fund | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
Fidelity Emerging Markets Debt Local Currency Central Fund | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
Fidelity Emerging Markets Debt Local Currency Central Fund | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
Fidelity Emerging Markets Debt Local Currency Central Fund | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
Fidelity Emerging Markets Debt Local Currency Central Fund | QDUSGovernmentandUSGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
Fidelity Emerging Markets Debt Local Currency Central Fund | QDAAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
Fidelity Emerging Markets Debt Local Currency Central Fund | QDAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Fidelity Emerging Markets Debt Local Currency Central Fund | QDAMember  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
Fidelity Emerging Markets Debt Local Currency Central Fund | QDBBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 17.50%
Fidelity Emerging Markets Debt Local Currency Central Fund | QDBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
Fidelity Emerging Markets Debt Local Currency Central Fund | QDNotRatedMember  
Holdings [Line Items]  
Percent of Net Asset Value 50.20%
Fidelity Emerging Markets Debt Local Currency Central Fund | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 12.70%
Fidelity Emerging Markets Debt Local Currency Central Fund | United States  
Holdings [Line Items]  
Percent of Net Asset Value 13.20%
Fidelity Emerging Markets Debt Local Currency Central Fund | Mexico  
Holdings [Line Items]  
Percent of Net Asset Value 10.50%
Fidelity Emerging Markets Debt Local Currency Central Fund | Brazil  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
Fidelity Emerging Markets Debt Local Currency Central Fund | India  
Holdings [Line Items]  
Percent of Net Asset Value 7.80%
Fidelity Emerging Markets Debt Local Currency Central Fund | Indonesia  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
Fidelity Emerging Markets Debt Local Currency Central Fund | South Africa  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
Fidelity Emerging Markets Debt Local Currency Central Fund | Poland  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
Fidelity Emerging Markets Debt Local Currency Central Fund | Malaysia  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity Emerging Markets Debt Local Currency Central Fund | Colombia  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
Fidelity Emerging Markets Debt Local Currency Central Fund | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 29.10%
Fidelity Emerging Markets Debt Local Currency Central Fund | AAForeignGovernmentandGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 84.10%
Fidelity Emerging Markets Debt Local Currency Central Fund | AACorporateBondsMember  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Fidelity Emerging Markets Debt Local Currency Central Fund | AAUSTreasuryObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
Fidelity Emerging Markets Debt Local Currency Central Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 12.70%
Fidelity Emerging Markets Debt Central Fund | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
Fidelity Emerging Markets Debt Central Fund | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
Fidelity Emerging Markets Debt Central Fund | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Fidelity Emerging Markets Debt Central Fund | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Fidelity Emerging Markets Debt Central Fund | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
Fidelity Emerging Markets Debt Central Fund | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
Fidelity Emerging Markets Debt Central Fund | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
Fidelity Emerging Markets Debt Central Fund | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
Fidelity Emerging Markets Debt Central Fund | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
Fidelity Emerging Markets Debt Central Fund | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
Fidelity Emerging Markets Debt Central Fund | QDUSGovernmentandUSGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Fidelity Emerging Markets Debt Central Fund | QDAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 11.40%
Fidelity Emerging Markets Debt Central Fund | QDAMember  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Fidelity Emerging Markets Debt Central Fund | QDBBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 23.40%
Fidelity Emerging Markets Debt Central Fund | QDBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 26.00%
Fidelity Emerging Markets Debt Central Fund | QDNotRatedMember  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Fidelity Emerging Markets Debt Central Fund | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 7.80%
Fidelity Emerging Markets Debt Central Fund | QDBMember  
Holdings [Line Items]  
Percent of Net Asset Value 15.80%
Fidelity Emerging Markets Debt Central Fund | QDCCCCCCMember  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
Fidelity Emerging Markets Debt Central Fund | QDDMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
Fidelity Emerging Markets Debt Central Fund | QDEquitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
Fidelity Emerging Markets Debt Central Fund | United States  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
Fidelity Emerging Markets Debt Central Fund | Mexico  
Holdings [Line Items]  
Percent of Net Asset Value 9.30%
Fidelity Emerging Markets Debt Central Fund | Brazil  
Holdings [Line Items]  
Percent of Net Asset Value 6.90%
Fidelity Emerging Markets Debt Central Fund | Colombia  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
Fidelity Emerging Markets Debt Central Fund | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 45.10%
Fidelity Emerging Markets Debt Central Fund | Saudi Arabia  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
Fidelity Emerging Markets Debt Central Fund | Argentina  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
Fidelity Emerging Markets Debt Central Fund | United Arab Emirates  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
Fidelity Emerging Markets Debt Central Fund | Turkey  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
Fidelity Emerging Markets Debt Central Fund | Chile  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
Fidelity Emerging Markets Debt Central Fund | AAForeignGovernmentandGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 46.00%
Fidelity Emerging Markets Debt Central Fund | AACorporateBondsMember  
Holdings [Line Items]  
Percent of Net Asset Value 40.20%
Fidelity Emerging Markets Debt Central Fund | AAUSTreasuryObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Fidelity Emerging Markets Debt Central Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 7.80%
Fidelity Emerging Markets Debt Central Fund | AAPreferredSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
Fidelity Emerging Markets Debt Central Fund | AAPreferredStocksMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Fidelity Emerging Markets Debt Central Fund | AACommonStocksMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Fidelity Emerging Markets Debt Central Fund | AABankLoanObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%