| Form N-CSR Cover | 12 Months Ended |
| Aug. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | Fidelity Covington Trust |
| Entity Central Index Key | 0000945908 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Aug. 31, 2024 |
| Shareholder Report | 12 Months Ended |
| Aug. 31, 2024 USD ($) shares | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | Fidelity Covington Trust |
| Entity Central Index Key | 0000945908 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Aug. 31, 2024 |
| Fidelity Preferred Securities & Income ETF | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Preferred Securities & Income ETF |
| Class Name | Fidelity® Preferred Securities & Income ETF |
| Trading Symbol | FPFD |
| Security Exchange Name | CboeBZX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity® Preferred Securities & Income ETF for the period September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-FIDELITY or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-FIDELITY |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity® Preferred Securities & Income ETF $ 0.60 % |
| Expenses Paid, Amount | $ 64 |
| Expense Ratio, Percent | 0.60% |
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period? • • • • • • • • • |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B26"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> |
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE June 15, 2021 through August 31, 2024. Initial investment of $10,000. Fidelity® Preferred Securities & Income ETF $10,000 $10,144 $8,673 $8,863 ICE® BofA® US All Capital Securities Index $10,000 $10,116 $8,958 $8,941 ICE U.S. All Capital Securities Constrained Custom Index $10,000 $10,118 $8,948 $8,898 Bloomberg U.S. Universal Bond Index $10,000 $10,125 $8,925 $8,890 2021 2022 2023 2024 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year Life of Fund Fidelity® Preferred Securities & Income ETF - NAV A 14.31% 0.41% Fidelity® Preferred Securities & Income ETF - Market Price B 14.07% 0.49% ICE® BofA® US All Capital Securities Index A 14.56% 0.75% ICE U.S. All Capital Securities Constrained Custom Index A 14.59% 0.60% Bloomberg U.S. Universal Bond Index A 7.92% -1.28% A From June 15, 2021 B From June 17, 2021, date initially listed on the Cboe BZX Exchange, Inc. exchange Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Performance Inception Date | Jun. 15, 2021 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 42,523,403 |
| Holdings Count | shares | 209 |
| Advisory Fees Paid, Amount | $ 205,063 |
| Investment Company Portfolio Turnover | 28% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 209 Total Advisory Fee $ Portfolio Turnover 28 % |
| Holdings [Text Block] | U.S. Government and U.S. Government Agency Obligations 7.4 A 6.2 BBB 32.9 BB 26.2 Equities 24.9 Short-Term Investments and Net Other Assets (Liabilities) 2.4 QUALITY DIVERSIFICATION (% of Fund's net assets) We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes. Preferred Securities 48.4 Preferred Stocks 24.9 Corporate Bonds 16.9 U.S. Treasury Obligations 7.4 Short-Term Investments and Net Other Assets (Liabilities) 2.4 ASSET ALLOCATION (% of Fund's net assets) United States 89.7 Canada 3.9 Japan 3.6 United Kingdom 1.0 France 0.5 Ireland 0.5 Germany 0.5 Netherlands 0.2 Bermuda 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) US Treasury Bonds 7.4 Energy Transfer LP 4.9 Bank of America Corp 3.3 Citigroup Inc 3.2 Bank of New York Mellon Corp/The 2.7 Goldman Sachs Group Inc/The 2.5 Charles Schwab Corp/The 2.4 Wells Fargo & Co 2.2 Wells Fargo & Co Series L, 7.5% 2.2 JPMorgan Chase & Co 2.2 33.0 |
| Fidelity Enhanced High Yield ETF | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Enhanced High Yield ETF |
| Class Name | Fidelity® Enhanced High Yield ETF |
| Trading Symbol | FDHY |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity® Enhanced High Yield ETF for the period September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-FIDELITY or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. |
| Additional Information Phone Number | 1-800-FIDELITY |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity® Enhanced High Yield ETF $ 0.46 % |
| Expenses Paid, Amount | $ 48 |
| Expense Ratio, Percent | 0.46% |
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period? • • • • • • • • |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B55"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> |
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE June 12, 2018 through August 31, 2024. Initial investment of $10,000. Fidelity® Enhanced High Yield ETF $10,000 $10,159 $11,122 $12,191 $13,246 $11,677 $12,483 ICE® BofA® BB-B US High Yield Constrained Index $10,000 $10,149 $10,965 $11,488 $12,461 $11,189 $11,941 Bloomberg U.S. Universal Bond Index $10,000 $10,113 $11,132 $11,846 $11,950 $10,534 $10,492 2018 2019 2020 2021 2022 2023 2024 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund Fidelity® Enhanced High Yield ETF - NAV A 12.20% 4.72% 5.56% Fidelity® Enhanced High Yield ETF - Market Price B 12.21% 4.67% 5.53% ICE® BofA® BB-B US High Yield Constrained Index A 11.95% 4.04% 4.77% Bloomberg U.S. Universal Bond Index A 7.92% 0.34% 2.02% A From June 12, 2018 B From June 14, 2018, date initially listed on the NYSE Arca, Inc. exchange Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Performance Inception Date | Jun. 12, 2018 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 334,153,829 |
| Holdings Count | shares | 418 |
| Advisory Fees Paid, Amount | $ 1,322,817 |
| Investment Company Portfolio Turnover | 51% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 418 Total Advisory Fee $ Portfolio Turnover 51 % |
| Holdings [Text Block] | BBB 1.3 BB 47.5 B 47.9 CCC,CC,C 1.2 Short-Term Investments and Net Other Assets (Liabilities) 2.1 QUALITY DIVERSIFICATION (% of Fund's net assets) We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes. Corporate Bonds 97.9 Short-Term Investments and Net Other Assets (Liabilities) 2.1 ASSET ALLOCATION (% of Fund's net assets) United States 84.7 Australia 5.6 Canada 4.1 United Kingdom 1.8 Japan 0.6 Italy 0.6 Luxembourg 0.5 France 0.4 Ireland 0.4 Others 1.3 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Mineral Resources Ltd 3.0 FMG Resources August 2006 Pty Ltd 2.2 CCO Holdings LLC / CCO Holdings Capital Corp 1.9 Northern Oil & Gas Inc 1.7 Vector Group Ltd 1.6 DaVita Inc 1.6 Delek Logistics Partners LP / Delek Logistics Finance Corp 1.5 CVR Energy Inc 1.5 TransDigm Inc 1.4 Nexstar Media Inc 1.4 17.8 |
| Material Fund Change [Text Block] | How has the Fund changed? This is a summary of certain changes to the Fund since September 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by November 29, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-FIDELITY or by sending an e-mail to fidfunddocuments fidelity.com . Effective October 10, 2024, the fund's name changed from Fidelity ® High Yield Factor ETF to Fidelity ® Enhanced High Yield ETF. |
| Material Fund Change Name [Text Block] | Effective October 10, 2024, the fund's name changed from Fidelity ® High Yield Factor ETF to Fidelity ® Enhanced High Yield ETF. |
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since September 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by November 29, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-FIDELITY or by sending an e-mail to fidfunddocuments fidelity.com . |
| Updated Prospectus Phone Number | 1-800-FIDELITY</span>" id="sjs-B70"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-FIDELITY</span> |
| Updated Prospectus Email Address | fidfunddocuments@fidelity.com</span>" id="sjs-B71"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> |
| Updated Prospectus Web Address | fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B72"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> |
| Fidelity Sustainable High Yield ETF | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Sustainable High Yield ETF |
| Class Name | Fidelity® Sustainable High Yield ETF |
| Trading Symbol | FSYD |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity® Sustainable High Yield ETF for the period September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-FIDELITY or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-FIDELITY |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity® Sustainable High Yield ETF $ 0.56 % |
| Expenses Paid, Amount | $ 59 |
| Expense Ratio, Percent | 0.56% |
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period? • • • • • • • • Application of FMR's environmental, social and governance (ESG) ratings process and/or its sustainable investing exclusion criteria may affect the fund's exposure to certain issuers, sectors, regions and countries and may affect the fund's performance. |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B89"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> |
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE February 15, 2022 through August 31, 2024. Initial investment of $10,000. Fidelity® Sustainable High Yield ETF $10,000 $9,322 $9,959 ICE® BofA® US High Yield Constrained Index $10,000 $9,295 $9,948 ICE US High Yield Best-in-Class ESG Index $10,000 $9,248 $9,853 Bloomberg U.S. Universal Bond Index $10,000 $9,276 $9,239 2022 2023 2024 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year Life of Fund Fidelity® Sustainable High Yield ETF - NAV A 12.33% 4.51% Fidelity® Sustainable High Yield ETF - Market Price B 12.16% 4.58% ICE® BofA® US High Yield Constrained Index A 12.47% 4.52% ICE US High Yield Best-in-Class ESG Index A 12.69% 4.21% Bloomberg U.S. Universal Bond Index A 7.92% -0.11% A From February 15, 2022 B From February 17, 2022, date initially listed on the NYSE Arca, Inc. exchange Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Performance Inception Date | Feb. 15, 2022 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 27,304,067 |
| Holdings Count | shares | 385 |
| Advisory Fees Paid, Amount | $ 87,233 |
| Investment Company Portfolio Turnover | 71% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 385 Total Advisory Fee $ Portfolio Turnover 71 % |
| Holdings [Text Block] | BBB 2.9 BB 40.8 B 39.5 CCC,CC,C 13.1 Not Rated 1.6 Equities 0.7 Short-Term Investments and Net Other Assets (Liabilities) 1.4 QUALITY DIVERSIFICATION (% of Fund's net assets) We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes. Corporate Bonds 95.7 Bank Loan Obligations 1.6 Common Stocks 0.7 Preferred Securities 0.6 Short-Term Investments and Net Other Assets (Liabilities) 1.4 ASSET ALLOCATION (% of Fund's net assets) United States 82.2 Canada 4.3 France 2.2 Australia 1.9 Ireland 1.5 United Kingdom 1.2 Tanzania 0.8 Zambia 0.5 Germany 0.5 Others 4.9 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Block Inc 2.3 CCO Holdings LLC / CCO Holdings Capital Corp 2.2 Brand Industrial Services Inc 2.0 AECOM 2.0 CHS/Community Health Systems Inc 2.0 Clear Channel Outdoor Holdings Inc 1.8 Reworld Holding Corp 1.7 DPL Inc 1.7 Tenet Healthcare Corp 1.6 Yum! Brands Inc 1.6 18.9 |
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | 36 Months Ended | 48 Months Ended | 60 Months Ended | 84 Months Ended | ||||||
| Aug. 31, 2024 | Aug. 31, 2024 | Aug. 31, 2024 | Aug. 31, 2024 | Aug. 31, 2024 | Aug. 31, 2023 | Aug. 31, 2022 | Aug. 31, 2021 | Aug. 31, 2020 | Aug. 31, 2019 | Aug. 31, 2018 | |
| C000227886_0_LG_BBIndexMember_4YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Universal Bond Index</span>" id="sjs-D5"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index</span> | ||||||||||
| C000227886_0_BBIndexMember_AsOf_2021Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | $ 10,000 | ||||||||||
| C000227886_0_BBIndexMember_AsOf_2022Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | $ 10,125 | ||||||||||
| C000227886_0_BBIndexMember_AsOf_2023Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | $ 8,925 | ||||||||||
| C000227886_0_BBIndexMember_AsOf_2024Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | $ 8,890 | $ 8,890 | $ 8,890 | $ 8,890 | $ 8,890 | ||||||
| C000227886_2_BBIndexMember_1YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 7.92% | ||||||||||
| C000227886_2_BBIndexMember_LOCMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | (1.28%) | ||||||||||
| C000201027_1_BBIndexMember_1YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 7.92% | ||||||||||
| C000201027_1_BBIndexMember_5YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 0.34% | ||||||||||
| C000201027_1_BBIndexMember_LOCMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 2.02% | ||||||||||
| C000234213_0_LG_BBIndexMember_3YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Universal Bond Index</span>" id="sjs-C35"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index</span> | ||||||||||
| C000234213_0_BBIndexMember_AsOf_2022Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 10,000 | ||||||||||
| C000234213_0_BBIndexMember_AsOf_2023Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 9,276 | ||||||||||
| C000234213_0_BBIndexMember_AsOf_2024Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | $ 9,239 | $ 9,239 | $ 9,239 | $ 9,239 | 9,239 | ||||||
| C000234213_2_BBIndexMember_1YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 7.92% | ||||||||||
| C000234213_2_BBIndexMember_LOCMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | (0.11%) | ||||||||||
| C000227886_LG_ClassMember_4YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Fidelity® Preferred Securities & Income ETF</span>" id="sjs-D53"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Preferred Securities & Income ETF</span> | ||||||||||
| C000227886_ClassMember_AsOf_2021Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 10,000 | ||||||||||
| C000227886_ClassMember_AsOf_2022Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 10,144 | ||||||||||
| C000227886_ClassMember_AsOf_2023Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 8,673 | ||||||||||
| C000227886_ClassMember_AsOf_2024Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | $ 8,863 | 8,863 | $ 8,863 | 8,863 | 8,863 | ||||||
| C000227886_LG_1_AdditionalIndexMember_4YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | ICE® BofA® US All Capital Securities Index</span>" id="sjs-D68"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE® BofA® US All Capital Securities Index</span> | ||||||||||
| C000227886_1_AdditionalIndexMember_AsOf_2021Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 10,000 | ||||||||||
| C000227886_1_AdditionalIndexMember_AsOf_2022Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 10,116 | ||||||||||
| C000227886_1_AdditionalIndexMember_AsOf_2023Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 8,958 | ||||||||||
| C000227886_1_AdditionalIndexMember_AsOf_2024Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 8,941 | 8,941 | $ 8,941 | 8,941 | 8,941 | ||||||
| C000227886_LG_2_AdditionalIndexMember_4YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | ICE U.S. All Capital Securities Constrained Custom Index</span>" id="sjs-D83"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE U.S. All Capital Securities Constrained Custom Index</span> | ||||||||||
| C000227886_2_AdditionalIndexMember_AsOf_2021Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 10,000 | ||||||||||
| C000227886_2_AdditionalIndexMember_AsOf_2022Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 10,118 | ||||||||||
| C000227886_2_AdditionalIndexMember_AsOf_2023Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 8,948 | ||||||||||
| C000227886_2_AdditionalIndexMember_AsOf_2024Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | $ 8,898 | 8,898 | $ 8,898 | 8,898 | $ 8,898 | ||||||
| C000227886_NoLoadClassMember_1YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 14.31% | ||||||||||
| C000227886_NoLoadClassMember_2023-09-01_2024-08-31Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 0.41% | ||||||||||
| C000227886_ETFNoLoadClassMember_1YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 14.07% | ||||||||||
| C000227886_ETFNoLoadClassMember_LOCMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 0.49% | ||||||||||
| C000227886_0_AdditionalIndexMember_1YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 14.56% | ||||||||||
| C000227886_0_AdditionalIndexMember_LOCMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 0.75% | ||||||||||
| C000227886_1_AdditionalIndexMember_1YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 14.59% | ||||||||||
| C000227886_1_AdditionalIndexMember_LOCMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 0.60% | ||||||||||
| C000201027_LG_ClassMember_7YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Fidelity® Enhanced High Yield ETF</span>" id="sjs-F122"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Enhanced High Yield ETF</span> | ||||||||||
| C000201027_ClassMember_AsOf_2018Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | $ 10,000 | ||||||||||
| C000201027_ClassMember_AsOf_2019Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | $ 10,159 | ||||||||||
| C000201027_ClassMember_AsOf_2020Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | $ 11,122 | ||||||||||
| C000201027_ClassMember_AsOf_2021Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 12,191 | ||||||||||
| C000201027_ClassMember_AsOf_2022Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 13,246 | ||||||||||
| C000201027_ClassMember_AsOf_2023Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 11,677 | ||||||||||
| C000201027_ClassMember_AsOf_2024Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | $ 12,483 | 12,483 | 12,483 | 12,483 | $ 12,483 | ||||||
| C000201027_LG_1_AdditionalIndexMember_7YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | ICE® BofA® BB-B US High Yield Constrained Index</span>" id="sjs-F146"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE® BofA® BB-B US High Yield Constrained Index</span> | ||||||||||
| C000201027_1_AdditionalIndexMember_AsOf_2018Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 10,000 | ||||||||||
| C000201027_1_AdditionalIndexMember_AsOf_2019Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 10,149 | ||||||||||
| C000201027_1_AdditionalIndexMember_AsOf_2020Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 10,965 | ||||||||||
| C000201027_1_AdditionalIndexMember_AsOf_2021Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 11,488 | ||||||||||
| C000201027_1_AdditionalIndexMember_AsOf_2022Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 12,461 | ||||||||||
| C000201027_1_AdditionalIndexMember_AsOf_2023Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 11,189 | ||||||||||
| C000201027_1_AdditionalIndexMember_AsOf_2024Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 11,941 | 11,941 | 11,941 | 11,941 | $ 11,941 | ||||||
| C000201027_LG_2_AdditionalIndexMember_7YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Universal Bond Index</span>" id="sjs-F170"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index</span> | ||||||||||
| C000201027_2_AdditionalIndexMember_AsOf_2018Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | $ 10,000 | ||||||||||
| C000201027_2_AdditionalIndexMember_AsOf_2019Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | $ 10,113 | ||||||||||
| C000201027_2_AdditionalIndexMember_AsOf_2020Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | $ 11,132 | ||||||||||
| C000201027_2_AdditionalIndexMember_AsOf_2021Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | $ 11,846 | ||||||||||
| C000201027_2_AdditionalIndexMember_AsOf_2022Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 11,950 | ||||||||||
| C000201027_2_AdditionalIndexMember_AsOf_2023Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 10,534 | ||||||||||
| C000201027_2_AdditionalIndexMember_AsOf_2024Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | $ 10,492 | $ 10,492 | 10,492 | $ 10,492 | $ 10,492 | ||||||
| C000201027_NoLoadClassMember_1YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 12.20% | ||||||||||
| C000201027_NoLoadClassMember_5YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 4.72% | ||||||||||
| C000201027_NoLoadClassMember_2023-09-01_2024-08-31Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 5.56% | ||||||||||
| C000201027_ETFNoLoadClassMember_1YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 12.21% | ||||||||||
| C000201027_ETFNoLoadClassMember_5YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 4.67% | ||||||||||
| C000201027_ETFNoLoadClassMember_LOCMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 5.53% | ||||||||||
| C000201027_0_AdditionalIndexMember_1YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 11.95% | ||||||||||
| C000201027_0_AdditionalIndexMember_5YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 4.04% | ||||||||||
| C000201027_0_AdditionalIndexMember_LOCMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 4.77% | ||||||||||
| C000234213_LG_ClassMember_3YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Fidelity® Sustainable High Yield ETF</span>" id="sjs-C221"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Sustainable High Yield ETF</span> | ||||||||||
| C000234213_ClassMember_AsOf_2022Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 10,000 | ||||||||||
| C000234213_ClassMember_AsOf_2023Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 9,322 | ||||||||||
| C000234213_ClassMember_AsOf_2024Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | $ 9,959 | $ 9,959 | 9,959 | $ 9,959 | 9,959 | ||||||
| C000234213_LG_1_AdditionalIndexMember_3YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | ICE® BofA® US High Yield Constrained Index</span>" id="sjs-C233"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE® BofA® US High Yield Constrained Index</span> | ||||||||||
| C000234213_1_AdditionalIndexMember_AsOf_2022Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 10,000 | ||||||||||
| C000234213_1_AdditionalIndexMember_AsOf_2023Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 9,295 | ||||||||||
| C000234213_1_AdditionalIndexMember_AsOf_2024Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 9,948 | $ 9,948 | 9,948 | 9,948 | 9,948 | ||||||
| C000234213_LG_2_AdditionalIndexMember_3YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | ICE US High Yield Best-in-Class ESG Index</span>" id="sjs-C245"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE US High Yield Best-in-Class ESG Index</span> | ||||||||||
| C000234213_2_AdditionalIndexMember_AsOf_2022Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | $ 10,000 | ||||||||||
| C000234213_2_AdditionalIndexMember_AsOf_2023Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | $ 9,248 | ||||||||||
| C000234213_2_AdditionalIndexMember_AsOf_2024Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | $ 9,853 | $ 9,853 | $ 9,853 | $ 9,853 | $ 9,853 | ||||||
| C000234213_NoLoadClassMember_1YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 12.33% | ||||||||||
| C000234213_NoLoadClassMember_2023-09-01_2024-08-31Member | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 4.51% | ||||||||||
| C000234213_ETFNoLoadClassMember_1YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 12.16% | ||||||||||
| C000234213_ETFNoLoadClassMember_LOCMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 4.58% | ||||||||||
| C000234213_0_AdditionalIndexMember_1YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 12.47% | ||||||||||
| C000234213_0_AdditionalIndexMember_LOCMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 4.52% | ||||||||||
| C000234213_1_AdditionalIndexMember_1YRMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 12.69% | ||||||||||
| C000234213_1_AdditionalIndexMember_LOCMember | |||||||||||
| Account Value [Line Items] | |||||||||||
| Average Annual Return, Percent | 4.21% |
| Shareholder Report, Holdings (Details) | Aug. 31, 2024 |
| Fidelity Preferred Securities & Income ETF | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.40% |
| Fidelity Preferred Securities & Income ETF | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Preferred Securities & Income ETF | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Fidelity Preferred Securities & Income ETF | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| Fidelity Preferred Securities & Income ETF | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Fidelity Preferred Securities & Income ETF | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Preferred Securities & Income ETF | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Preferred Securities & Income ETF | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Preferred Securities & Income ETF | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Preferred Securities & Income ETF | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Preferred Securities & Income ETF | QDUSGovernmentandUSGovernmentAgencyObligationsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.40% |
| Fidelity Preferred Securities & Income ETF | QDAMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Preferred Securities & Income ETF | QDBBBMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 32.90% |
| Fidelity Preferred Securities & Income ETF | QDBBMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.20% |
| Fidelity Preferred Securities & Income ETF | QDEquitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.90% |
| Fidelity Preferred Securities & Income ETF | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Preferred Securities & Income ETF | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 89.70% |
| Fidelity Preferred Securities & Income ETF | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Preferred Securities & Income ETF | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Preferred Securities & Income ETF | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Preferred Securities & Income ETF | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Preferred Securities & Income ETF | Ireland | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Preferred Securities & Income ETF | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Preferred Securities & Income ETF | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Preferred Securities & Income ETF | Bermuda | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Preferred Securities & Income ETF | AAPreferredSecuritiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 48.40% |
| Fidelity Preferred Securities & Income ETF | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.90% |
| Fidelity Preferred Securities & Income ETF | AACorporateBondsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.90% |
| Fidelity Preferred Securities & Income ETF | AAUSTreasuryObligationsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.40% |
| Fidelity Preferred Securities & Income ETF | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Enhanced High Yield ETF | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| Fidelity Enhanced High Yield ETF | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Enhanced High Yield ETF | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Enhanced High Yield ETF | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Fidelity Enhanced High Yield ETF | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Fidelity Enhanced High Yield ETF | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Fidelity Enhanced High Yield ETF | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Enhanced High Yield ETF | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Enhanced High Yield ETF | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Enhanced High Yield ETF | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Enhanced High Yield ETF | QDBBBMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Enhanced High Yield ETF | QDBBMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 47.50% |
| Fidelity Enhanced High Yield ETF | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Fidelity Enhanced High Yield ETF | QDBMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 47.90% |
| Fidelity Enhanced High Yield ETF | QDCCCCCCMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Enhanced High Yield ETF | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 84.70% |
| Fidelity Enhanced High Yield ETF | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Enhanced High Yield ETF | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Enhanced High Yield ETF | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Fidelity Enhanced High Yield ETF | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Fidelity Enhanced High Yield ETF | Ireland | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Fidelity Enhanced High Yield ETF | Australia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| Fidelity Enhanced High Yield ETF | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Enhanced High Yield ETF | Luxembourg | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Enhanced High Yield ETF | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Enhanced High Yield ETF | AACorporateBondsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.90% |
| Fidelity Enhanced High Yield ETF | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Fidelity Sustainable High Yield ETF | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Sustainable High Yield ETF | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Sustainable High Yield ETF | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Sustainable High Yield ETF | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Sustainable High Yield ETF | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Sustainable High Yield ETF | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Fidelity Sustainable High Yield ETF | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Fidelity Sustainable High Yield ETF | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Fidelity Sustainable High Yield ETF | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Fidelity Sustainable High Yield ETF | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Fidelity Sustainable High Yield ETF | QDBBBMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Sustainable High Yield ETF | QDBBMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 40.80% |
| Fidelity Sustainable High Yield ETF | QDEquitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Sustainable High Yield ETF | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Sustainable High Yield ETF | QDBMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 39.50% |
| Fidelity Sustainable High Yield ETF | QDCCCCCCMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.10% |
| Fidelity Sustainable High Yield ETF | QDNotRatedMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Fidelity Sustainable High Yield ETF | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 82.20% |
| Fidelity Sustainable High Yield ETF | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| Fidelity Sustainable High Yield ETF | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Sustainable High Yield ETF | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Sustainable High Yield ETF | Ireland | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Sustainable High Yield ETF | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Sustainable High Yield ETF | Australia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Sustainable High Yield ETF | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Sustainable High Yield ETF | Tanzania, United Republic of | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Sustainable High Yield ETF | Zambia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Sustainable High Yield ETF | AAPreferredSecuritiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Sustainable High Yield ETF | AACorporateBondsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.70% |
| Fidelity Sustainable High Yield ETF | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Sustainable High Yield ETF | AABankLoanObligationsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Fidelity Sustainable High Yield ETF | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
