v3.25.2
Shareholder Report, Holdings (Details)
Apr. 30, 2025
Fidelity International High Dividend ETF | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Fidelity International High Dividend ETF | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Fidelity International High Dividend ETF | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Fidelity International High Dividend ETF | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Fidelity International High Dividend ETF | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
Fidelity International High Dividend ETF | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Fidelity International High Dividend ETF | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
Fidelity International High Dividend ETF | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
Fidelity International High Dividend ETF | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
Fidelity International High Dividend ETF | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
Fidelity International High Dividend ETF | MSFinancialsSectorMember  
Holdings [Line Items]  
Percent of Net Asset Value 31.40%
Fidelity International High Dividend ETF | Information Technology Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
Fidelity International High Dividend ETF | Healthcare Sector  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Fidelity International High Dividend ETF | Real Estate Sector  
Holdings [Line Items]  
Percent of Net Asset Value 8.80%
Fidelity International High Dividend ETF | Industrial Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.30%
Fidelity International High Dividend ETF | Materials Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 13.10%
Fidelity International High Dividend ETF | Consumer Discretionary Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
Fidelity International High Dividend ETF | Consumer Staples Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 14.60%
Fidelity International High Dividend ETF | Utilities Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 10.40%
Fidelity International High Dividend ETF | Japan  
Holdings [Line Items]  
Percent of Net Asset Value 16.60%
Fidelity International High Dividend ETF | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 13.40%
Fidelity International High Dividend ETF | Canada  
Holdings [Line Items]  
Percent of Net Asset Value 12.20%
Fidelity International High Dividend ETF | Australia  
Holdings [Line Items]  
Percent of Net Asset Value 9.90%
Fidelity International High Dividend ETF | France  
Holdings [Line Items]  
Percent of Net Asset Value 9.80%
Fidelity International High Dividend ETF | United States  
Holdings [Line Items]  
Percent of Net Asset Value 7.80%
Fidelity International High Dividend ETF | Germany  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
Fidelity International High Dividend ETF | Italy  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
Fidelity International High Dividend ETF | Sweden  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
Fidelity International High Dividend ETF | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 15.00%
Fidelity International High Dividend ETF | AACommonStocksMember  
Holdings [Line Items]  
Percent of Net Asset Value 98.70%
Fidelity International High Dividend ETF | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Fidelity Fundamental Developed International ETF | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Fidelity Fundamental Developed International ETF | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Fidelity Fundamental Developed International ETF | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Fidelity Fundamental Developed International ETF | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity Fundamental Developed International ETF | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity Fundamental Developed International ETF | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
Fidelity Fundamental Developed International ETF | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
Fidelity Fundamental Developed International ETF | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Fidelity Fundamental Developed International ETF | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Fidelity Fundamental Developed International ETF | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Fidelity Fundamental Developed International ETF | MSFinancialsSectorMember  
Holdings [Line Items]  
Percent of Net Asset Value 27.70%
Fidelity Fundamental Developed International ETF | Information Technology Member  
Holdings [Line Items]  
Percent of Net Asset Value 12.40%
Fidelity Fundamental Developed International ETF | Healthcare Sector  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
Fidelity Fundamental Developed International ETF | Real Estate Sector  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Fidelity Fundamental Developed International ETF | Industrial Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 26.20%
Fidelity Fundamental Developed International ETF | Materials Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.60%
Fidelity Fundamental Developed International ETF | Consumer Discretionary Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 8.60%
Fidelity Fundamental Developed International ETF | Consumer Staples Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
Fidelity Fundamental Developed International ETF | Communications Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
Fidelity Fundamental Developed International ETF | Energy Sector  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Fidelity Fundamental Developed International ETF | Japan  
Holdings [Line Items]  
Percent of Net Asset Value 18.10%
Fidelity Fundamental Developed International ETF | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 17.90%
Fidelity Fundamental Developed International ETF | Canada  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
Fidelity Fundamental Developed International ETF | France  
Holdings [Line Items]  
Percent of Net Asset Value 12.60%
Fidelity Fundamental Developed International ETF | United States  
Holdings [Line Items]  
Percent of Net Asset Value 7.80%
Fidelity Fundamental Developed International ETF | Germany  
Holdings [Line Items]  
Percent of Net Asset Value 13.40%
Fidelity Fundamental Developed International ETF | Italy  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Fidelity Fundamental Developed International ETF | Sweden  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Fidelity Fundamental Developed International ETF | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 12.60%
Fidelity Fundamental Developed International ETF | Netherlands  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
Fidelity Fundamental Developed International ETF | AACommonStocksMember  
Holdings [Line Items]  
Percent of Net Asset Value 99.20%
Fidelity Fundamental Developed International ETF | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
Fidelity International Value Factor ETF | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
Fidelity International Value Factor ETF | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
Fidelity International Value Factor ETF | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
Fidelity International Value Factor ETF | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
Fidelity International Value Factor ETF | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
Fidelity International Value Factor ETF | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Fidelity International Value Factor ETF | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
Fidelity International Value Factor ETF | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
Fidelity International Value Factor ETF | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
Fidelity International Value Factor ETF | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
Fidelity International Value Factor ETF | MSFinancialsSectorMember  
Holdings [Line Items]  
Percent of Net Asset Value 25.20%
Fidelity International Value Factor ETF | Information Technology Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.80%
Fidelity International Value Factor ETF | Healthcare Sector  
Holdings [Line Items]  
Percent of Net Asset Value 10.10%
Fidelity International Value Factor ETF | Real Estate Sector  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
Fidelity International Value Factor ETF | Industrial Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 18.60%
Fidelity International Value Factor ETF | Materials Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
Fidelity International Value Factor ETF | Consumer Discretionary Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
Fidelity International Value Factor ETF | Consumer Staples Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.40%
Fidelity International Value Factor ETF | Communications Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Fidelity International Value Factor ETF | Energy Sector  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
Fidelity International Value Factor ETF | Utilities Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
Fidelity International Value Factor ETF | Japan  
Holdings [Line Items]  
Percent of Net Asset Value 22.80%
Fidelity International Value Factor ETF | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 11.90%
Fidelity International Value Factor ETF | Canada  
Holdings [Line Items]  
Percent of Net Asset Value 10.40%
Fidelity International Value Factor ETF | Australia  
Holdings [Line Items]  
Percent of Net Asset Value 6.50%
Fidelity International Value Factor ETF | France  
Holdings [Line Items]  
Percent of Net Asset Value 8.80%
Fidelity International Value Factor ETF | United States  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
Fidelity International Value Factor ETF | Germany  
Holdings [Line Items]  
Percent of Net Asset Value 11.20%
Fidelity International Value Factor ETF | Sweden  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Fidelity International Value Factor ETF | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 12.20%
Fidelity International Value Factor ETF | Spain  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
Fidelity International Value Factor ETF | AACommonStocksMember  
Holdings [Line Items]  
Percent of Net Asset Value 99.20%
Fidelity International Value Factor ETF | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
Fidelity Fundamental Global ex US ETF | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Fidelity Fundamental Global ex US ETF | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
Fidelity Fundamental Global ex US ETF | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Fidelity Fundamental Global ex US ETF | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
Fidelity Fundamental Global ex US ETF | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
Fidelity Fundamental Global ex US ETF | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
Fidelity Fundamental Global ex US ETF | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
Fidelity Fundamental Global ex US ETF | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
Fidelity Fundamental Global ex US ETF | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
Fidelity Fundamental Global ex US ETF | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
Fidelity Fundamental Global ex US ETF | MSFinancialsSectorMember  
Holdings [Line Items]  
Percent of Net Asset Value 27.30%
Fidelity Fundamental Global ex US ETF | Information Technology Member  
Holdings [Line Items]  
Percent of Net Asset Value 13.00%
Fidelity Fundamental Global ex US ETF | Healthcare Sector  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
Fidelity Fundamental Global ex US ETF | Real Estate Sector  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
Fidelity Fundamental Global ex US ETF | Industrial Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 23.00%
Fidelity Fundamental Global ex US ETF | Materials Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
Fidelity Fundamental Global ex US ETF | Consumer Discretionary Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 9.80%
Fidelity Fundamental Global ex US ETF | Consumer Staples Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
Fidelity Fundamental Global ex US ETF | Communications Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
Fidelity Fundamental Global ex US ETF | Energy Sector  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
Fidelity Fundamental Global ex US ETF | Utilities Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Fundamental Global ex US ETF | Japan  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
Fidelity Fundamental Global ex US ETF | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 14.00%
Fidelity Fundamental Global ex US ETF | Canada  
Holdings [Line Items]  
Percent of Net Asset Value 9.30%
Fidelity Fundamental Global ex US ETF | France  
Holdings [Line Items]  
Percent of Net Asset Value 9.50%
Fidelity Fundamental Global ex US ETF | United States  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
Fidelity Fundamental Global ex US ETF | Germany  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
Fidelity Fundamental Global ex US ETF | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 24.30%
Fidelity Fundamental Global ex US ETF | Netherlands  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
Fidelity Fundamental Global ex US ETF | India  
Holdings [Line Items]  
Percent of Net Asset Value 6.60%
Fidelity Fundamental Global ex US ETF | China  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
Fidelity Fundamental Global ex US ETF | AACommonStocksMember  
Holdings [Line Items]  
Percent of Net Asset Value 98.20%
Fidelity Fundamental Global ex US ETF | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
Fidelity International Multifactor ETF | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
Fidelity International Multifactor ETF | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
Fidelity International Multifactor ETF | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
Fidelity International Multifactor ETF | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Fidelity International Multifactor ETF | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
Fidelity International Multifactor ETF | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
Fidelity International Multifactor ETF | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Fidelity International Multifactor ETF | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Fidelity International Multifactor ETF | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Fidelity International Multifactor ETF | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
Fidelity International Multifactor ETF | MSFinancialsSectorMember  
Holdings [Line Items]  
Percent of Net Asset Value 20.30%
Fidelity International Multifactor ETF | Information Technology Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
Fidelity International Multifactor ETF | Healthcare Sector  
Holdings [Line Items]  
Percent of Net Asset Value 14.20%
Fidelity International Multifactor ETF | Real Estate Sector  
Holdings [Line Items]  
Percent of Net Asset Value 6.90%
Fidelity International Multifactor ETF | Industrial Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 13.90%
Fidelity International Multifactor ETF | Materials Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity International Multifactor ETF | Consumer Discretionary Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.70%
Fidelity International Multifactor ETF | Consumer Staples Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 12.40%
Fidelity International Multifactor ETF | Communications Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 9.40%
Fidelity International Multifactor ETF | Energy Sector  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
Fidelity International Multifactor ETF | Japan  
Holdings [Line Items]  
Percent of Net Asset Value 22.30%
Fidelity International Multifactor ETF | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 13.00%
Fidelity International Multifactor ETF | Canada  
Holdings [Line Items]  
Percent of Net Asset Value 12.70%
Fidelity International Multifactor ETF | Australia  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
Fidelity International Multifactor ETF | France  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity International Multifactor ETF | United States  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
Fidelity International Multifactor ETF | Germany  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
Fidelity International Multifactor ETF | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 19.00%
Fidelity International Multifactor ETF | Netherlands  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
Fidelity International Multifactor ETF | Switzerland  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
Fidelity International Multifactor ETF | AACommonStocksMember  
Holdings [Line Items]  
Percent of Net Asset Value 99.30%
Fidelity International Multifactor ETF | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Fidelity Emerging Markets Multifactor ETF | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
Fidelity Emerging Markets Multifactor ETF | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
Fidelity Emerging Markets Multifactor ETF | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
Fidelity Emerging Markets Multifactor ETF | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
Fidelity Emerging Markets Multifactor ETF | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
Fidelity Emerging Markets Multifactor ETF | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
Fidelity Emerging Markets Multifactor ETF | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Fidelity Emerging Markets Multifactor ETF | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
Fidelity Emerging Markets Multifactor ETF | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
Fidelity Emerging Markets Multifactor ETF | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
Fidelity Emerging Markets Multifactor ETF | MSFinancialsSectorMember  
Holdings [Line Items]  
Percent of Net Asset Value 20.50%
Fidelity Emerging Markets Multifactor ETF | Information Technology Member  
Holdings [Line Items]  
Percent of Net Asset Value 17.70%
Fidelity Emerging Markets Multifactor ETF | Healthcare Sector  
Holdings [Line Items]  
Percent of Net Asset Value 7.80%
Fidelity Emerging Markets Multifactor ETF | Industrial Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Fidelity Emerging Markets Multifactor ETF | Materials Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 9.50%
Fidelity Emerging Markets Multifactor ETF | Consumer Discretionary Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 10.40%
Fidelity Emerging Markets Multifactor ETF | Consumer Staples Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 8.60%
Fidelity Emerging Markets Multifactor ETF | Communications Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 13.70%
Fidelity Emerging Markets Multifactor ETF | Energy Sector  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
Fidelity Emerging Markets Multifactor ETF | Utilities Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Fidelity Emerging Markets Multifactor ETF | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 14.60%
Fidelity Emerging Markets Multifactor ETF | India  
Holdings [Line Items]  
Percent of Net Asset Value 16.40%
Fidelity Emerging Markets Multifactor ETF | China  
Holdings [Line Items]  
Percent of Net Asset Value 25.70%
Fidelity Emerging Markets Multifactor ETF | Taiwan  
Holdings [Line Items]  
Percent of Net Asset Value 15.20%
Fidelity Emerging Markets Multifactor ETF | Korea, Republic of  
Holdings [Line Items]  
Percent of Net Asset Value 9.90%
Fidelity Emerging Markets Multifactor ETF | Brazil  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
Fidelity Emerging Markets Multifactor ETF | Indonesia  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
Fidelity Emerging Markets Multifactor ETF | Saudi Arabia  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Fidelity Emerging Markets Multifactor ETF | Malaysia  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Fidelity Emerging Markets Multifactor ETF | Hungary  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
Fidelity Emerging Markets Multifactor ETF | AACommonStocksMember  
Holdings [Line Items]  
Percent of Net Asset Value 99.30%
Fidelity Emerging Markets Multifactor ETF | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Fidelity Emerging Markets Multifactor ETF | AAPreferredStocksMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
Fidelity Fundamental Emerging Markets ETF | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 10.70%
Fidelity Fundamental Emerging Markets ETF | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.80%
Fidelity Fundamental Emerging Markets ETF | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
Fidelity Fundamental Emerging Markets ETF | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
Fidelity Fundamental Emerging Markets ETF | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
Fidelity Fundamental Emerging Markets ETF | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Fidelity Fundamental Emerging Markets ETF | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Fidelity Fundamental Emerging Markets ETF | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
Fidelity Fundamental Emerging Markets ETF | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
Fidelity Fundamental Emerging Markets ETF | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
Fidelity Fundamental Emerging Markets ETF | MSFinancialsSectorMember  
Holdings [Line Items]  
Percent of Net Asset Value 22.80%
Fidelity Fundamental Emerging Markets ETF | Information Technology Member  
Holdings [Line Items]  
Percent of Net Asset Value 21.00%
Fidelity Fundamental Emerging Markets ETF | Healthcare Sector  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Fidelity Fundamental Emerging Markets ETF | Real Estate Sector  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Fidelity Fundamental Emerging Markets ETF | Industrial Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
Fidelity Fundamental Emerging Markets ETF | Materials Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
Fidelity Fundamental Emerging Markets ETF | Consumer Discretionary Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 14.80%
Fidelity Fundamental Emerging Markets ETF | Consumer Staples Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
Fidelity Fundamental Emerging Markets ETF | Communications Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 9.80%
Fidelity Fundamental Emerging Markets ETF | Energy Sector  
Holdings [Line Items]  
Percent of Net Asset Value 6.40%
Fidelity Fundamental Emerging Markets ETF | Utilities Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
Fidelity Fundamental Emerging Markets ETF | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 11.50%
Fidelity Fundamental Emerging Markets ETF | India  
Holdings [Line Items]  
Percent of Net Asset Value 14.70%
Fidelity Fundamental Emerging Markets ETF | China  
Holdings [Line Items]  
Percent of Net Asset Value 30.00%
Fidelity Fundamental Emerging Markets ETF | Taiwan  
Holdings [Line Items]  
Percent of Net Asset Value 14.60%
Fidelity Fundamental Emerging Markets ETF | Korea, Republic of  
Holdings [Line Items]  
Percent of Net Asset Value 8.90%
Fidelity Fundamental Emerging Markets ETF | Brazil  
Holdings [Line Items]  
Percent of Net Asset Value 7.80%
Fidelity Fundamental Emerging Markets ETF | Indonesia  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
Fidelity Fundamental Emerging Markets ETF | Mexico  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
Fidelity Fundamental Emerging Markets ETF | South Africa  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Fidelity Fundamental Emerging Markets ETF | United Arab Emirates  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Fidelity Fundamental Emerging Markets ETF | AACommonStocksMember  
Holdings [Line Items]  
Percent of Net Asset Value 99.40%
Fidelity Fundamental Emerging Markets ETF | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%