Risk/Return Detail Data - FidelityFundamentalETFs-ComboPro	Nov. 14, 2024 USD ($)
Risk/Return:
Registrant Name	Fidelity Covington Trust
FidelityFundamentalETFs-ComboPro | Fidelity Fundamental Emerging Markets ETF
Risk/Return:
Risk/Return [Heading]	Fund Summary Fund: Fidelity ® Fundamental Emerging Markets ETF
Objective [Heading]	Investment Objective
Objective, Primary [Text Block]	Fidelity® Fundamental Emerging Markets ETF seeks long-term growth of capital.
Expense [Heading]	Fee Table
Expense Narrative [Text Block]	The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
Shareholder Fees Caption [Text]	Shareholder fees
(fees paid directly from your investment)	none
Operating Expenses Caption [Text]	Annual Operating Expenses
Portfolio Turnover [Heading]	Portfolio Turnover
Portfolio Turnover [Text Block]	The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance.
Other Expenses, New Fund, Based on Estimates [Text]	Based on estimated amounts for the current fiscal year.
Expense Example Narrative [Text Block]	This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:
Strategy [Heading]	Principal Investment Strategies
Strategy Narrative [Text Block]	Normally investing at least 80% of assets in securities of issuers and in depositary receipts representing securities of issuers in emerging markets and other investments that are tied economically to emerging markets. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. The Adviser considers a number of factors to determine whether an issuer is located in or tied economically to a particular country or region including: whether a third-party vendor has assigned a particular country or region classification to the issuer or included the issuer in an index representative of a particular country or region; the issuer's domicile, incorporation, and location of assets; whether the issuer derives at least 50% of its revenues from, or has at least 50% of its assets in, a particular country or region; the source of government guarantees (if any); and the primary trading market or listing exchange. Whether an issuer is located in or tied economically to a particular country can be determined under any of these factors.    Effective December 11, 2025, derivative instruments that provide investment exposure to the securities above or exposure to the market risk factors associated with such securities are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives.   Normally investing primarily in common stocks. Allocating investments across different emerging markets countries. Using an investment process that starts with fundamental analyst research and security recommendations, and reference portfolios managed by Fidelity Management & Research Company LLC (FMR) (the Adviser) that are based on fundamental analysis, and then applying a quantitative portfolio construction process designed to emphasize securities in which the Adviser has high conviction subject to appropriate security and portfolio-level risk, liquidity, and trading characteristics.
Risk [Heading]	Principal Investment Risks
Bar Chart and Performance Table [Heading]	Performance
Performance Narrative [Text Block]	Performance history will be available for the fund after the fund has been in operation for one calendar year.
Performance One Year or Less [Text]	Performance history will be available for the fund after the fund has been in operation for one calendar year.
FidelityFundamentalETFs-ComboPro | Fidelity Fundamental Emerging Markets ETF | Fidelity Fundamental Emerging Markets ETF
Risk/Return:
Management fee	0.60%
Distribution and/or Service (12b-1) fees	none
Other expenses	none	[1]
Total annual operating expenses	0.60%
1 year	$ 61
3 years	$ 192

[1] A Based on estimated amounts for the current fiscal year.