v3.26.1
Shareholder Report, Holdings (Details)
Apr. 30, 2026
Fidelity International Value Factor ETF | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Fidelity International Value Factor ETF | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
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 26.00%
Fidelity International Value Factor ETF | Information Technology Member  
Holdings [Line Items]  
Percent of Net Asset Value 9.60%
Fidelity International Value Factor ETF | Healthcare Sector  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
Fidelity International Value Factor ETF | Real Estate Sector  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
Fidelity International Value Factor ETF | Industrial Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 19.10%
Fidelity International Value Factor ETF | Materials Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.70%
Fidelity International Value Factor ETF | Consumer Discretionary Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.70%
Fidelity International Value Factor ETF | Consumer Staples Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
Fidelity International Value Factor ETF | Communications Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Fidelity International Value Factor ETF | Energy Sector  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
Fidelity International Value Factor ETF | Utilities Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Fidelity International Value Factor ETF | Japan  
Holdings [Line Items]  
Percent of Net Asset Value 22.90%
Fidelity International Value Factor ETF | Canada  
Holdings [Line Items]  
Percent of Net Asset Value 13.80%
Fidelity International Value Factor ETF | United States  
Holdings [Line Items]  
Percent of Net Asset Value 9.60%
Fidelity International Value Factor ETF | Germany  
Holdings [Line Items]  
Percent of Net Asset Value 9.30%
Fidelity International Value Factor ETF | France  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
Fidelity International Value Factor ETF | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 9.10%
Fidelity International Value Factor ETF | Australia  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
Fidelity International Value Factor ETF | Netherlands  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
Fidelity International Value Factor ETF | Italy  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
Fidelity International Value Factor ETF | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 13.50%
Fidelity International Value Factor ETF | AACommonStocksMember  
Holdings [Line Items]  
Percent of Net Asset Value 99.30%
Fidelity International Value Factor ETF | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
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 1.60%
Fidelity International Multifactor ETF | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Fidelity International Multifactor ETF | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
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 1.40%
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 1.30%
Fidelity International Multifactor ETF | MSFinancialsSectorMember  
Holdings [Line Items]  
Percent of Net Asset Value 22.50%
Fidelity International Multifactor ETF | Information Technology Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
Fidelity International Multifactor ETF | Healthcare Sector  
Holdings [Line Items]  
Percent of Net Asset Value 12.90%
Fidelity International Multifactor ETF | Industrial Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 14.80%
Fidelity International Multifactor ETF | Materials Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Fidelity International Multifactor ETF | Consumer Discretionary Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Fidelity International Multifactor ETF | Consumer Staples Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 9.40%
Fidelity International Multifactor ETF | Communications Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
Fidelity International Multifactor ETF | Energy Sector  
Holdings [Line Items]  
Percent of Net Asset Value 11.60%
Fidelity International Multifactor ETF | Utilities Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 8.50%
Fidelity International Multifactor ETF | Japan  
Holdings [Line Items]  
Percent of Net Asset Value 19.80%
Fidelity International Multifactor ETF | Canada  
Holdings [Line Items]  
Percent of Net Asset Value 13.90%
Fidelity International Multifactor ETF | United States  
Holdings [Line Items]  
Percent of Net Asset Value 7.20%
Fidelity International Multifactor ETF | Germany  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Fidelity International Multifactor ETF | France  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
Fidelity International Multifactor ETF | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 14.90%
Fidelity International Multifactor ETF | Australia  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Fidelity International Multifactor ETF | Netherlands  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Fidelity International Multifactor ETF | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 21.00%
Fidelity International Multifactor ETF | Spain  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
Fidelity International Multifactor ETF | AACommonStocksMember  
Holdings [Line Items]  
Percent of Net Asset Value 99.20%
Fidelity International Multifactor ETF | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
Fidelity International High Dividend ETF | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
Fidelity International High Dividend ETF | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
Fidelity International High Dividend ETF | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
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 2.70%
Fidelity International High Dividend ETF | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity International High Dividend ETF | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity International High Dividend ETF | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity International High Dividend ETF | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity International High Dividend ETF | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
Fidelity International High Dividend ETF | MSFinancialsSectorMember  
Holdings [Line Items]  
Percent of Net Asset Value 19.30%
Fidelity International High Dividend ETF | Information Technology Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Fidelity International High Dividend ETF | Healthcare Sector  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Fidelity International High Dividend ETF | Real Estate Sector  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
Fidelity International High Dividend ETF | Industrial Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.70%
Fidelity International High Dividend ETF | Materials Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
Fidelity International High Dividend ETF | Consumer Discretionary Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 12.90%
Fidelity International High Dividend ETF | Consumer Staples Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 13.20%
Fidelity International High Dividend ETF | Energy Sector  
Holdings [Line Items]  
Percent of Net Asset Value 16.10%
Fidelity International High Dividend ETF | Utilities Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.50%
Fidelity International High Dividend ETF | Japan  
Holdings [Line Items]  
Percent of Net Asset Value 18.20%
Fidelity International High Dividend ETF | Canada  
Holdings [Line Items]  
Percent of Net Asset Value 13.90%
Fidelity International High Dividend ETF | United States  
Holdings [Line Items]  
Percent of Net Asset Value 6.40%
Fidelity International High Dividend ETF | Germany  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity International High Dividend ETF | France  
Holdings [Line Items]  
Percent of Net Asset Value 17.60%
Fidelity International High Dividend ETF | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
Fidelity International High Dividend ETF | Australia  
Holdings [Line Items]  
Percent of Net Asset Value 10.30%
Fidelity International High Dividend ETF | Italy  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
Fidelity International High Dividend ETF | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 11.60%
Fidelity International High Dividend ETF | Norway  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
Fidelity International High Dividend ETF | AACommonStocksMember  
Holdings [Line Items]  
Percent of Net Asset Value 99.20%
Fidelity International High Dividend ETF | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
Fidelity Emerging Markets Multifactor ETF | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.70%
Fidelity Emerging Markets Multifactor ETF | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
Fidelity Emerging Markets Multifactor ETF | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Fidelity Emerging Markets Multifactor ETF | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Fidelity Emerging Markets Multifactor ETF | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
Fidelity Emerging Markets Multifactor ETF | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
Fidelity Emerging Markets Multifactor ETF | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
Fidelity Emerging Markets Multifactor ETF | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
Fidelity Emerging Markets Multifactor ETF | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Fidelity Emerging Markets Multifactor ETF | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Fidelity Emerging Markets Multifactor ETF | MSFinancialsSectorMember  
Holdings [Line Items]  
Percent of Net Asset Value 16.80%
Fidelity Emerging Markets Multifactor ETF | Information Technology Member  
Holdings [Line Items]  
Percent of Net Asset Value 31.90%
Fidelity Emerging Markets Multifactor ETF | Real Estate Sector  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
Fidelity Emerging Markets Multifactor ETF | Industrial Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Fidelity Emerging Markets Multifactor ETF | Materials Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
Fidelity Emerging Markets Multifactor ETF | Consumer Discretionary Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 12.30%
Fidelity Emerging Markets Multifactor ETF | Consumer Staples Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
Fidelity Emerging Markets Multifactor ETF | Communications Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 10.40%
Fidelity Emerging Markets Multifactor ETF | Energy Sector  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
Fidelity Emerging Markets Multifactor ETF | Utilities Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Emerging Markets Multifactor ETF | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 10.90%
Fidelity Emerging Markets Multifactor ETF | China  
Holdings [Line Items]  
Percent of Net Asset Value 25.60%
Fidelity Emerging Markets Multifactor ETF | Taiwan  
Holdings [Line Items]  
Percent of Net Asset Value 21.80%
Fidelity Emerging Markets Multifactor ETF | Korea, Republic of  
Holdings [Line Items]  
Percent of Net Asset Value 16.90%
Fidelity Emerging Markets Multifactor ETF | India  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
Fidelity Emerging Markets Multifactor ETF | Brazil  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
Fidelity Emerging Markets Multifactor ETF | Mexico  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Fidelity Emerging Markets Multifactor ETF | South Africa  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Fidelity Emerging Markets Multifactor ETF | Thailand  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
Fidelity Emerging Markets Multifactor ETF | United Arab Emirates  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
Fidelity Emerging Markets Multifactor ETF | AACommonStocksMember  
Holdings [Line Items]  
Percent of Net Asset Value 98.60%
Fidelity Emerging Markets Multifactor ETF | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
Fidelity Emerging Markets Multifactor ETF | AAPreferredStocksMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
Fidelity Fundamental Developed International ETF | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
Fidelity Fundamental Developed International ETF | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Fidelity Fundamental Developed International ETF | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Fidelity Fundamental Developed International ETF | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
Fidelity Fundamental Developed International ETF | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
Fidelity Fundamental Developed International ETF | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
Fidelity Fundamental Developed International ETF | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
Fidelity Fundamental Developed International ETF | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
Fidelity Fundamental Developed International ETF | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
Fidelity Fundamental Developed International ETF | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
Fidelity Fundamental Developed International ETF | MSFinancialsSectorMember  
Holdings [Line Items]  
Percent of Net Asset Value 26.70%
Fidelity Fundamental Developed International ETF | Information Technology Member  
Holdings [Line Items]  
Percent of Net Asset Value 12.80%
Fidelity Fundamental Developed International ETF | Healthcare Sector  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
Fidelity Fundamental Developed International ETF | Real Estate Sector  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
Fidelity Fundamental Developed International ETF | Industrial Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 25.40%
Fidelity Fundamental Developed International ETF | Materials Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.90%
Fidelity Fundamental Developed International ETF | Consumer Discretionary Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
Fidelity Fundamental Developed International ETF | Consumer Staples Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
Fidelity Fundamental Developed International ETF | Communications Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
Fidelity Fundamental Developed International ETF | Energy Sector  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
Fidelity Fundamental Developed International ETF | Utilities Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
Fidelity Fundamental Developed International ETF | Japan  
Holdings [Line Items]  
Percent of Net Asset Value 21.70%
Fidelity Fundamental Developed International ETF | United States  
Holdings [Line Items]  
Percent of Net Asset Value 10.10%
Fidelity Fundamental Developed International ETF | Germany  
Holdings [Line Items]  
Percent of Net Asset Value 8.30%
Fidelity Fundamental Developed International ETF | France  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
Fidelity Fundamental Developed International ETF | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 16.10%
Fidelity Fundamental Developed International ETF | Netherlands  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
Fidelity Fundamental Developed International ETF | Italy  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
Fidelity Fundamental Developed International ETF | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 16.30%
Fidelity Fundamental Developed International ETF | Spain  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
Fidelity Fundamental Developed International ETF | Sweden  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
Fidelity Fundamental Developed International ETF | AACommonStocksMember  
Holdings [Line Items]  
Percent of Net Asset Value 98.80%
Fidelity Fundamental Developed International ETF | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
Fidelity Fundamental Global ex US ETF | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.70%
Fidelity Fundamental Global ex US ETF | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Fidelity Fundamental Global ex US ETF | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity Fundamental Global ex US ETF | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
Fidelity Fundamental Global ex US ETF | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
Fidelity Fundamental Global ex US ETF | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
Fidelity Fundamental Global ex US ETF | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
Fidelity Fundamental Global ex US ETF | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
Fidelity Fundamental Global ex US ETF | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Fidelity Fundamental Global ex US ETF | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Fidelity Fundamental Global ex US ETF | MSFinancialsSectorMember  
Holdings [Line Items]  
Percent of Net Asset Value 24.40%
Fidelity Fundamental Global ex US ETF | Information Technology Member  
Holdings [Line Items]  
Percent of Net Asset Value 21.90%
Fidelity Fundamental Global ex US ETF | Healthcare Sector  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
Fidelity Fundamental Global ex US ETF | Real Estate Sector  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Fundamental Global ex US ETF | Industrial Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 20.10%
Fidelity Fundamental Global ex US ETF | Materials Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 8.10%
Fidelity Fundamental Global ex US ETF | Consumer Discretionary Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
Fidelity Fundamental Global ex US ETF | Consumer Staples Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Fidelity Fundamental Global ex US ETF | Communications Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Fidelity Fundamental Global ex US ETF | Energy Sector  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
Fidelity Fundamental Global ex US ETF | Utilities Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
Fidelity Fundamental Global ex US ETF | Japan  
Holdings [Line Items]  
Percent of Net Asset Value 12.50%
Fidelity Fundamental Global ex US ETF | Canada  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
Fidelity Fundamental Global ex US ETF | United States  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
Fidelity Fundamental Global ex US ETF | Germany  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
Fidelity Fundamental Global ex US ETF | France  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
Fidelity Fundamental Global ex US ETF | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
Fidelity Fundamental Global ex US ETF | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 32.00%
Fidelity Fundamental Global ex US ETF | China  
Holdings [Line Items]  
Percent of Net Asset Value 7.70%
Fidelity Fundamental Global ex US ETF | Taiwan  
Holdings [Line Items]  
Percent of Net Asset Value 9.70%
Fidelity Fundamental Global ex US ETF | Korea, Republic of  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
Fidelity Fundamental Global ex US ETF | AACommonStocksMember  
Holdings [Line Items]  
Percent of Net Asset Value 99.50%
Fidelity Fundamental Global ex US ETF | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
Fidelity Fundamental Emerging Markets ETF | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 16.40%
Fidelity Fundamental Emerging Markets ETF | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 8.70%
Fidelity Fundamental Emerging Markets ETF | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
Fidelity Fundamental Emerging Markets ETF | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
Fidelity Fundamental Emerging Markets ETF | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Fidelity Fundamental Emerging Markets ETF | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
Fidelity Fundamental Emerging Markets ETF | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
Fidelity Fundamental Emerging Markets ETF | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
Fidelity Fundamental Emerging Markets ETF | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.60%
Fidelity Fundamental Emerging Markets ETF | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Fidelity Fundamental Emerging Markets ETF | MSFinancialsSectorMember  
Holdings [Line Items]  
Percent of Net Asset Value 19.80%
Fidelity Fundamental Emerging Markets ETF | Information Technology Member  
Holdings [Line Items]  
Percent of Net Asset Value 37.40%
Fidelity Fundamental Emerging Markets ETF | Healthcare Sector  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
Fidelity Fundamental Emerging Markets ETF | Real Estate Sector  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
Fidelity Fundamental Emerging Markets ETF | Industrial Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 10.30%
Fidelity Fundamental Emerging Markets ETF | Materials Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity Fundamental Emerging Markets ETF | Consumer Discretionary Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.80%
Fidelity Fundamental Emerging Markets ETF | Consumer Staples Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
Fidelity Fundamental Emerging Markets ETF | Communications Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
Fidelity Fundamental Emerging Markets ETF | Energy Sector  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
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 10.20%
Fidelity Fundamental Emerging Markets ETF | China  
Holdings [Line Items]  
Percent of Net Asset Value 23.40%
Fidelity Fundamental Emerging Markets ETF | Taiwan  
Holdings [Line Items]  
Percent of Net Asset Value 24.50%
Fidelity Fundamental Emerging Markets ETF | Korea, Republic of  
Holdings [Line Items]  
Percent of Net Asset Value 17.00%
Fidelity Fundamental Emerging Markets ETF | India  
Holdings [Line Items]  
Percent of Net Asset Value 8.80%
Fidelity Fundamental Emerging Markets ETF | Brazil  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
Fidelity Fundamental Emerging Markets ETF | Mexico  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
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 2.00%
Fidelity Fundamental Emerging Markets ETF | Saudi Arabia  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
Fidelity Fundamental Emerging Markets ETF | AACommonStocksMember  
Holdings [Line Items]  
Percent of Net Asset Value 99.30%
Fidelity Fundamental Emerging Markets ETF | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%