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. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 50,000 in the fund or certain other Fidelity ® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 37 of the prospectus and in the sales charge waiver appendix to the prospectus.

Shareholder Fees Caption [Optional Text]

Shareholder fees

Operating Expenses Caption [Optional Text]

Annual Operating Expenses

Fee Waiver or Reimbursement over Assets, Date of Termination

Sep. 30, 2027

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. During the most recent fiscal year, the fund's portfolio turnover rate was 31 % of the average value of its portfolio.

Portfolio Turnover, Rate

31.00%

Expenses Deferred Charges [Text Block]

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% and 0.25%, respectively.

Expense Breakpoint Discounts [Text]

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 50,000 in the fund or certain other Fidelity ® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 37 of the prospectus

Expense Breakpoint, Minimum Investment Required [Amount]

$ 50,000

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 and if you hold your shares:

Strategy [Heading]

Principal Investment Strategies

Strategy Narrative [Text Block]

Normally investing at least 80% of assets in equity securities of climate aware companies. Climate aware companies are those that Fidelity Management & Research Company LLC (FMR) (the Adviser) believes are working to address climate change or its impacts either indirectly through their corporate strategy, or directly through the technology, services, or products they provide. Such companies include those that (i) have a low carbon transition score of neutral or better as rated by MSCI within the MSCI World Climate Change Index, and/or (ii) have an above average environmental pillar score as rated by FMR or MSCI. FMR's environmental pillar score represents the portion of the Adviser's proprietary ESG rating process that focuses on a company's environmental practices using a data-driven framework that includes proprietary and third-party (such as Carbon Disclosure Project (CDP) and MSCI) data. The neutral rating within the MSCI World Climate Change Index represents companies with limited exposure to low carbon transition carbon risk. A company's environmental profile may include, but is not limited to, carbon and toxic emissions, water management, waste management, vulnerability to the physical impacts of climate change, and research and investment into products, services, and energies that reduce emissions and/or provide opportunities to achieve a low carbon transition. Derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives. Investing in securities of domestic and foreign issuers. Investing in either "growth" stocks or "value" stocks or both. Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments. Employing sustainable investing exclusion criteria to avoid investments in issuers that are directly engaged in, and/or derive significant revenue from, certain industries. Please see "Fund Basics - Investment Details - Sustainable Investing Exclusions" for additional information.

Bar Chart and Performance Table [Heading]

Performance

Performance Narrative [Text Block]

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The additional index has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Visit institutional.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

institutional.fidelity.com

Performance Past Does Not Indicate Future [Text]

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

Year-by-Year Returns

Bar Chart Narrative [Text Block]

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Bar Chart Does Not Reflect Sales Loads [Text]

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Year to Date Return, Label [Optional Text]

Year-to-Date Return

Bar Chart, Year to Date Return, Date

Jun. 30, 2026

Bar Chart, Year to Date Return

16.28%

Highest Quarterly Return, Label [Optional Text]

Highest Quarter Return

Highest Quarterly Return, Date

Mar. 31, 2024

Highest Quarterly Return

12.60%

Lowest Quarterly Return, Label [Optional Text]

Lowest Quarter Return

Lowest Quarterly Return, Date

Jun. 30, 2022

Lowest Quarterly Return

(18.71%)

Performance Table Heading

Average Annual Returns

Performance Table Does Reflect Sales Loads

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.

Performance Table Uses Highest Federal Rate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table One Class of after Tax Shown [Text]

After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary.

Performance Table Explanation after Tax Higher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

FidelityClimateActionFund-AMCIZPRO | Fidelity Climate Action Fund | After Taxes on Distributions | Fidelity Advisor Climate Action Fund - Class A

Prospectus Line Items

Average Annual Return, Label [Optional Text]

Return After Taxes on Distributions

Average Annual Return, Percent

14.06%

7.50%

^[4]

FidelityClimateActionFund-AMCIZPRO | Fidelity Climate Action Fund | After Taxes on Distributions and Sales | Fidelity Advisor Climate Action Fund - Class A

Prospectus Line Items

Average Annual Return, Label [Optional Text]

Return After Taxes on Distributions and Sale of Fund Shares

Average Annual Return, Percent

8.32%

5.88%

^[4]

FidelityClimateActionFund-AMCIZPRO | Fidelity Climate Action Fund | IXWC6

Prospectus Line Items

Average Annual Return, Label [Optional Text]

MSCI World Climate Change Index

Average Annual Return, Percent

20.13%

12.41%

FidelityClimateActionFund-AMCIZPRO | Fidelity Climate Action Fund | MS113

Prospectus Line Items

Average Annual Return, Label [Optional Text]

MSCI World Index

Average Annual Return, Percent

21.51%

10.83%

FidelitySustainableUSEquityFund-AMCIZPRO | Fidelity Sustainable U.S. Equity Fund | Fidelity Advisor Sustainable U.S. Equity Fund - Class A

Prospectus Line Items

Maximum Cumulative Sales Charge (as a percentage of Offering Price)

5.75%

Maximum Deferred Sales Charge (as a percentage)

^[10]

0.00%

Management Fees (as a percentage of Assets)

^[11]

0.64%

Distribution and Service (12b-1) Fees

0.25%

Other Expenses (as a percentage of Assets):

0.51%

Expenses (as a percentage of Assets)

1.40%

Fee Waiver or Reimbursement

^[12]

(0.25%)

Net Expenses (as a percentage of Assets)

1.15%

Expense Example, with Redemption, 1 Year

$ 685

Expense Example, with Redemption, 3 Years

961

Expense Example, with Redemption, 5 Years

1,266

Expense Example, with Redemption, 10 Years

2,131

Expense Example, No Redemption, 1 Year

685

Expense Example, No Redemption, 3 Years

961

Expense Example, No Redemption, 5 Years

1,266

Expense Example, No Redemption, 10 Years

$ 2,131

Annual Return, Inception Date

Jun. 15, 2021

Average Annual Return, Label [Optional Text]

Return Before Taxes

Average Annual Return, Percent

8.50%

8.43%

^[13]

Annual Return [Percent]

15.12%

19.92%

24.33%

(19.80%)

FidelitySustainableUSEquityFund-AMCIZPRO | Fidelity Sustainable U.S. Equity Fund | Fidelity Advisor Sustainable U.S. Equity Fund - Class M

Prospectus Line Items

Maximum Cumulative Sales Charge (as a percentage of Offering Price)

3.50%

Maximum Deferred Sales Charge (as a percentage)

^[10]

0.00%

Management Fees (as a percentage of Assets)

^[11]

0.64%

Distribution and Service (12b-1) Fees

0.50%

Other Expenses (as a percentage of Assets):

0.52%

Expenses (as a percentage of Assets)

1.66%

Fee Waiver or Reimbursement

^[12]

(0.26%)

Net Expenses (as a percentage of Assets)

1.40%

Expense Example, with Redemption, 1 Year

$ 488

Expense Example, with Redemption, 3 Years

822

Expense Example, with Redemption, 5 Years

1,189

Expense Example, with Redemption, 10 Years

2,218

Expense Example, No Redemption, 1 Year

488

Expense Example, No Redemption, 3 Years

822

Expense Example, No Redemption, 5 Years

1,189

Expense Example, No Redemption, 10 Years

$ 2,218

Annual Return, Inception Date

Jun. 15, 2021

Average Annual Return, Label [Optional Text]

Return Before Taxes

Average Annual Return, Percent

10.84%

8.72%

^[14]

FidelitySustainableUSEquityFund-AMCIZPRO | Fidelity Sustainable U.S. Equity Fund | Fidelity Advisor Sustainable U.S. Equity Fund - Class C

Prospectus Line Items

Maximum Cumulative Sales Charge (as a percentage of Offering Price)

0.00%

Maximum Deferred Sales Charge (as a percentage)

^[15]

1.00%

Management Fees (as a percentage of Assets)

^[11]

0.64%

Distribution and Service (12b-1) Fees

1.00%

Other Expenses (as a percentage of Assets):

0.52%

Expenses (as a percentage of Assets)

2.16%

Fee Waiver or Reimbursement

^[12]

(0.26%)

Net Expenses (as a percentage of Assets)

1.90%

Expenses Deferred Charges [Text Block]

On Class C shares redeemed less than one year after purchase.

Expense Example, with Redemption, 1 Year

$ 293

Expense Example, with Redemption, 3 Years

642

Expense Example, with Redemption, 5 Years

1,127

Expense Example, with Redemption, 10 Years

2,272

Expense Example, No Redemption, 1 Year

193

Expense Example, No Redemption, 3 Years

642

Expense Example, No Redemption, 5 Years

1,127

Expense Example, No Redemption, 10 Years

$ 2,272

Annual Return, Inception Date

Jun. 15, 2021

Average Annual Return, Label [Optional Text]

Return Before Taxes

Average Annual Return, Percent

13.21%

9.02%

^[16]

FidelitySustainableUSEquityFund-AMCIZPRO | Fidelity Sustainable U.S. Equity Fund | Fidelity Advisor Sustainable U.S. Equity Fund - Class I

Prospectus Line Items

Maximum Cumulative Sales Charge (as a percentage of Offering Price)

0.00%

Maximum Deferred Sales Charge (as a percentage)

0.00%

Management Fees (as a percentage of Assets)

^[11]

0.58%

Distribution and Service (12b-1) Fees

0.00%

Other Expenses (as a percentage of Assets):

0.52%

Expenses (as a percentage of Assets)

1.10%

Fee Waiver or Reimbursement

^[12]

(0.20%)

Net Expenses (as a percentage of Assets)

0.90%

Expense Example, with Redemption, 1 Year

$ 92

Expense Example, with Redemption, 3 Years

323

Expense Example, with Redemption, 5 Years

580

Expense Example, with Redemption, 10 Years

1,316

Expense Example, No Redemption, 1 Year

Expense Example, No Redemption, 3 Years

323

Expense Example, No Redemption, 5 Years

580

Expense Example, No Redemption, 10 Years

$ 1,316

Annual Return, Inception Date

Jun. 15, 2021

Average Annual Return, Label [Optional Text]

Return Before Taxes

Average Annual Return, Percent

15.43%

10.13%

^[17]

FidelitySustainableUSEquityFund-AMCIZPRO | Fidelity Sustainable U.S. Equity Fund | Fidelity Advisor Sustainable U.S. Equity Fund - Class Z

Prospectus Line Items

Maximum Cumulative Sales Charge (as a percentage of Offering Price)

0.00%

Maximum Deferred Sales Charge (as a percentage)

0.00%

Management Fees (as a percentage of Assets)

^[11]

0.49%

Distribution and Service (12b-1) Fees

0.00%

Other Expenses (as a percentage of Assets):

0.51%

Expenses (as a percentage of Assets)

1.00%

Fee Waiver or Reimbursement

^[12]

(0.25%)

Net Expenses (as a percentage of Assets)

0.75%

Expense Example, with Redemption, 1 Year

$ 77

Expense Example, with Redemption, 3 Years

285

Expense Example, with Redemption, 5 Years

520

Expense Example, with Redemption, 10 Years

1,194

Expense Example, No Redemption, 1 Year

Expense Example, No Redemption, 3 Years

285

Expense Example, No Redemption, 5 Years

520

Expense Example, No Redemption, 10 Years

$ 1,194

Annual Return, Inception Date

Jun. 15, 2021

Average Annual Return, Label [Optional Text]

Return Before Taxes

Average Annual Return, Percent

15.57%

10.29%

^[18]

FidelitySustainableUSEquityFund-AMCIZPRO | Fidelity Sustainable U.S. Equity Fund

Prospectus Line Items

Risk/Return [Heading]

Fund Summary Fund /Class: Fidelity® Sustainable U.S. Equity Fund /Fidelity Advisor® Sustainable U.S. Equity Fund A, M, C, I, Z

Objective [Heading]

Investment Objective

Objective, Primary [Text Block]

Fidelity® Sustainable U.S. Equity Fund seeks long-term growth of capital.

Expense Heading [Optional Text]

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. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 50,000 in the fund or certain other Fidelity ® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 38 of the prospectus and in the sales charge waiver appendix to the prospectus.

Shareholder Fees Caption [Optional Text]

Shareholder fees

Operating Expenses Caption [Optional Text]

Annual Operating Expenses

Fee Waiver or Reimbursement over Assets, Date of Termination

Sep. 30, 2027

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

51.00%

Expenses Deferred Charges [Text Block]

Expense Breakpoint Discounts [Text]

Expense Breakpoint, Minimum Investment Required [Amount]

$ 50,000

Expense Example Narrative [Text Block]

Strategy [Heading]

Principal Investment Strategies

Strategy Narrative [Text Block]

Normally investing primarily in equity securities. Normally investing at least 80% of assets in equity securities of U.S. companies that Fidelity Management & Research Company LLC (FMR) (the Adviser) believes have proven or improving sustainability practices based on an evaluation of such companies' individual environmental, social and governance (ESG) profile. Equity securities represent an ownership interest, or the right to acquire an ownership interest, in an issuer. Equity securities include common stocks (including depositary receipts evidencing ownership of common stock), preferred stocks and other preferred securities, convertible securities, rights and warrants, and other securities, such as hybrid securities and trust preferred securities, believed to have equity-like 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. Derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives. Using the Adviser's proprietary ESG rating process to evaluate an issuer's sustainability practices using a data-driven framework that includes both proprietary and third-party data, and may also involve a qualitative assessment of an issuer's sustainability practices provided by the Adviser's research team. The Adviser's ESG rating of issuers are derived from multiple factors, including an issuer's environmental profile, which may include, but is not limited to, carbon and toxic emissions, water management, waste management, vulnerability to the physical impacts of climate change, and research and investment into products, services, and energies that reduce emissions and/or provide opportunities to transition to less carbon-intensive products or operations. An assessment of an issuer's social profile includes, but is not limited to, its approach to diversity and inclusion, human capital management, data privacy, product safety and human rights. With respect to governance, the independence and diversity of an issuer's board, its compensation practices and board oversight of critical ESG issues are considered as part of the assessment. These factors are weighted based on how material the Adviser believes each factor is to an issuer's financial outlook, and not all factors may be applicable to all issuers. Investing in issuers that the Adviser believes deliver tangible environmental or social impact through core business operations. An assessment of the impact characteristics of an issuer may involve corporate engagement and an analysis of issuer alignment with the United Nations Sustainable Development Goals using qualitative analysis as well as proprietary or third-party data. For example, issuers that provide access to clean water, education, or clean energy through their core business may be considered to deliver tangible impact. Investing in securities of domestic and foreign issuers. In addition to the ESG rating process, using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments. Employing sustainable investing exclusion criteria to avoid investments in issuers that are directly engaged in, and/or derive significant revenue from, certain industries. Please see "Fund Basics - Investment Details - Sustainable Investing Exclusions" for additional information.

Bar Chart and Performance Table [Heading]

Performance

Performance Narrative [Text Block]

Performance Information Illustrates Variability of Returns [Text]

Performance Availability Website Address [Text]

institutional.fidelity.com

Performance Past Does Not Indicate Future [Text]

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

Year-by-Year Returns

Bar Chart Narrative [Text Block]

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Bar Chart Does Not Reflect Sales Loads [Text]

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Year to Date Return, Label [Optional Text]

Year-to-Date Return

Bar Chart, Year to Date Return, Date

Jun. 30, 2026

Bar Chart, Year to Date Return

13.86%

Highest Quarterly Return, Label [Optional Text]

Highest Quarter Return

Highest Quarterly Return, Date

Jun. 30, 2025

Highest Quarterly Return

16.19%

Lowest Quarterly Return, Label [Optional Text]

Lowest Quarter Return

Lowest Quarterly Return, Date

Jun. 30, 2022

Lowest Quarterly Return

(16.65%)

Performance Table Heading

Average Annual Returns

Performance Table Does Reflect Sales Loads

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.

Performance Table Uses Highest Federal Rate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

Performance Table One Class of after Tax Shown [Text]

After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary.

Performance Table Explanation after Tax Higher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

FidelitySustainableUSEquityFund-AMCIZPRO | Fidelity Sustainable U.S. Equity Fund | After Taxes on Distributions | Fidelity Advisor Sustainable U.S. Equity Fund - Class A

Prospectus Line Items

Average Annual Return, Label [Optional Text]

Return After Taxes on Distributions

Average Annual Return, Percent

8.50%

8.36%

^[13]

FidelitySustainableUSEquityFund-AMCIZPRO | Fidelity Sustainable U.S. Equity Fund | After Taxes on Distributions and Sales | Fidelity Advisor Sustainable U.S. Equity Fund - Class A

Prospectus Line Items

Average Annual Return, Label [Optional Text]

Return After Taxes on Distributions and Sale of Fund Shares

Average Annual Return, Percent

5.03%

6.62%

^[13]

FidelitySustainableUSEquityFund-AMCIZPRO | Fidelity Sustainable U.S. Equity Fund | IXSLM

Prospectus Line Items

Average Annual Return, Label [Optional Text]

MSCI USA IMI ESG Leaders Index

Average Annual Return, Percent

18.29%

12.08%

FidelitySustainableUSEquityFund-AMCIZPRO | Fidelity Sustainable U.S. Equity Fund | RS003

Prospectus Line Items

Average Annual Return, Label [Optional Text]

Russell 3000® Index

Average Annual Return, Percent

17.15%

11.36%

FidelitySAISustainableSectorFundFidelitySAISustainableUSEquityFund-ComboPRO | Fidelity SAI Sustainable Sector Fund | Fidelity SAI Sustainable Sector Fund

Prospectus Line Items

Management Fees (as a percentage of Assets)

0.40%

Distribution and Service (12b-1) Fees

0.00%

Other Expenses (as a percentage of Assets):

0.03%

Expenses (as a percentage of Assets)

0.43%

Expense Example, with Redemption, 1 Year

$ 44

Expense Example, with Redemption, 3 Years

138

Expense Example, with Redemption, 5 Years

241

Expense Example, with Redemption, 10 Years

$ 542

Annual Return, Inception Date

Apr. 14, 2022

Average Annual Return, Label [Optional Text]

Return Before Taxes

Average Annual Return, Percent

17.55%

14.56%

^[19]

Annual Return [Percent]

17.55%

23.14%

31.66%

FidelitySAISustainableSectorFundFidelitySAISustainableUSEquityFund-ComboPRO | Fidelity SAI Sustainable Sector Fund

Prospectus Line Items

Risk/Return [Heading]

Fund Summary Fund: Fidelity® SAI Sustainable Sector Fund

Objective [Heading]

Investment Objective

Objective, Primary [Text Block]

Fidelity® SAI Sustainable Sector Fund seeks long-term growth of capital.

Expense Heading [Optional Text]

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.

Shareholder Fees Caption [Optional Text]

Shareholder fees

Shareholder Fee, Other

$ 0

Operating Expenses Caption [Optional Text]

Annual Operating Expenses

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

59.00%

Expense Example Narrative [Text Block]

Strategy [Heading]

Principal Investment Strategies

Strategy Narrative [Text Block]

Normally investing primarily in equity securities. Normally investing at least 80% of assets in securities of companies that Fidelity Management & Research Company LLC (FMR) (the Adviser) believes have proven or improving sustainability practices based on an evaluation of such companies' individual environmental, social and governance (ESG) profile. Derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives. Using a quantitative portfolio construction and optimization model to create a sector neutral portfolio of securities that is designed to capitalize on the Adviser's proprietary ESG ratings process. Using the Adviser's proprietary ESG rating process to evaluate an issuer's sustainability practices using a data-driven framework that includes both proprietary and third-party data, and may also involve a qualitative assessment of an issuer's sustainability practices provided by the Adviser's research team. The Adviser's ESG rating of issuers are derived from multiple factors, including an issuer's environmental profile, which may include, but is not limited to, carbon and toxic emissions, water management, waste management, vulnerability to the physical impacts of climate change, and research and investment into products, services, and energies that reduce emissions and/or provide opportunities to transition to less carbon-intensive products or operations. An assessment of an issuer's social profile includes, but is not limited to, its approach to diversity and inclusion, human capital management, data privacy, product safety and human rights. With respect to governance, the independence and diversity of an issuer's board, its compensation practices and board oversight of critical ESG issues are considered as part of the assessment. These factors are weighted based on how material the Adviser believes each factor is to an issuer's financial outlook, and not all factors may be applicable to all issuers. Third-party ESG ratings will be considered in addition to the Adviser's ESG rating in the quantitative portfolio construction and optimization process. Investing in securities of domestic and foreign issuers. Using an investment process that starts with fundamental analyst research and security recommendations, and reference portfolios managed by 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, sustainability, and trading characteristics. Employing sustainable investing exclusion criteria to avoid investments in issuers that are directly engaged in, and/or derive significant revenue from, certain industries. Please see "Fund Basics - Investment Details - Sustainable Investing Exclusions" for additional information.

Bar Chart and Performance Table [Heading]

Performance

Performance Narrative [Text Block]

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The additional index has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

Performance Availability Website Address [Text]

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

Year-by-Year Returns

Year to Date Return, Label [Optional Text]

Year-to-Date Return

Bar Chart, Year to Date Return, Date

Jun. 30, 2026

Bar Chart, Year to Date Return

15.88%

Highest Quarterly Return, Label [Optional Text]

Highest Quarter Return

Highest Quarterly Return, Date

Dec. 31, 2023

Highest Quarterly Return

12.46%

Lowest Quarterly Return, Label [Optional Text]

Lowest Quarter Return

Lowest Quarterly Return, Date

Mar. 31, 2025

Lowest Quarterly Return

(6.45%)

Performance Table Heading

Average Annual Returns

Performance Table Uses Highest Federal Rate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

Performance Table Explanation after Tax Higher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

FidelitySAISustainableSectorFundFidelitySAISustainableUSEquityFund-ComboPRO | Fidelity SAI Sustainable Sector Fund | After Taxes on Distributions | Fidelity SAI Sustainable Sector Fund

Prospectus Line Items

Average Annual Return, Label [Optional Text]

Return After Taxes on Distributions

Average Annual Return, Percent

17.37%

14.34%

^[19]

FidelitySAISustainableSectorFundFidelitySAISustainableUSEquityFund-ComboPRO | Fidelity SAI Sustainable Sector Fund | After Taxes on Distributions and Sales | Fidelity SAI Sustainable Sector Fund

Prospectus Line Items

Average Annual Return, Label [Optional Text]

Return After Taxes on Distributions and Sale of Fund Shares

Average Annual Return, Percent

10.50%

11.49%

^[19]

FidelitySAISustainableSectorFundFidelitySAISustainableUSEquityFund-ComboPRO | Fidelity SAI Sustainable Sector Fund | IXSLM

Prospectus Line Items

Average Annual Return, Label [Optional Text]

MSCI USA IMI ESG Leaders Index

Average Annual Return, Percent

18.29%

14.16%

FidelitySAISustainableSectorFundFidelitySAISustainableUSEquityFund-ComboPRO | Fidelity SAI Sustainable Sector Fund | WA006

Prospectus Line Items

Average Annual Return, Label [Optional Text]

Dow Jones U.S. Total Stock Market Index℠

Average Annual Return, Percent

17.05%

13.55%

FidelitySAISustainableSectorFundFidelitySAISustainableUSEquityFund-ComboPRO | Fidelity SAI Sustainable U.S. Equity Fund | Fidelity SAI Sustainable U.S. Equity Fund

Prospectus Line Items

Management Fees (as a percentage of Assets)

0.50%

Distribution and Service (12b-1) Fees

0.00%

Other Expenses (as a percentage of Assets):

0.03%

Expenses (as a percentage of Assets)

0.53%

Expense Example, with Redemption, 1 Year

$ 54

Expense Example, with Redemption, 3 Years

170

Expense Example, with Redemption, 5 Years

296

Expense Example, with Redemption, 10 Years

$ 665

Annual Return, Inception Date

Apr. 14, 2022

Average Annual Return, Label [Optional Text]

Return Before Taxes

Average Annual Return, Percent

15.80%

12.23%

^[20]

Annual Return [Percent]

15.80%

20.79%

24.99%

FidelitySAISustainableSectorFundFidelitySAISustainableUSEquityFund-ComboPRO | Fidelity SAI Sustainable U.S. Equity Fund

Prospectus Line Items

Risk/Return [Heading]

Fund Summary Fund: Fidelity® SAI Sustainable U.S. Equity Fund

Objective [Heading]

Investment Objective

Objective, Primary [Text Block]

Fidelity® SAI Sustainable U.S. Equity Fund seeks long-term growth of capital.

Expense Heading [Optional Text]

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.

Shareholder Fees Caption [Optional Text]

Shareholder fees

Shareholder Fee, Other

$ 0

Operating Expenses Caption [Optional Text]

Annual Operating Expenses

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

52.00%

Expense Example Narrative [Text Block]

Strategy [Heading]

Principal Investment Strategies

Strategy Narrative [Text Block]

Bar Chart and Performance Table [Heading]

Performance

Performance Narrative [Text Block]

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The additional index has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

Performance Availability Website Address [Text]

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

Year-by-Year Returns

Year to Date Return, Label [Optional Text]

Year-to-Date Return

Bar Chart, Year to Date Return, Date

Jun. 30, 2026

Bar Chart, Year to Date Return

14.33%

Highest Quarterly Return, Label [Optional Text]

Highest Quarter Return

Highest Quarterly Return, Date

Jun. 30, 2025

Highest Quarterly Return

15.80%

Lowest Quarterly Return, Label [Optional Text]

Lowest Quarter Return

Lowest Quarterly Return, Date

Mar. 31, 2025

Lowest Quarterly Return

(9.42%)

Performance Table Heading

Average Annual Returns

Performance Table Uses Highest Federal Rate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

Performance Table Explanation after Tax Higher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

FidelitySAISustainableSectorFundFidelitySAISustainableUSEquityFund-ComboPRO | Fidelity SAI Sustainable U.S. Equity Fund | After Taxes on Distributions | Fidelity SAI Sustainable U.S. Equity Fund

Prospectus Line Items

Average Annual Return, Label [Optional Text]

Return After Taxes on Distributions

Average Annual Return, Percent

15.32%

11.91%

^[20]

FidelitySAISustainableSectorFundFidelitySAISustainableUSEquityFund-ComboPRO | Fidelity SAI Sustainable U.S. Equity Fund | After Taxes on Distributions and Sales | Fidelity SAI Sustainable U.S. Equity Fund

Prospectus Line Items

Average Annual Return, Label [Optional Text]

Return After Taxes on Distributions and Sale of Fund Shares

Average Annual Return, Percent

9.65%

9.57%

^[20]

FidelitySAISustainableSectorFundFidelitySAISustainableUSEquityFund-ComboPRO | Fidelity SAI Sustainable U.S. Equity Fund | IXSLM

Prospectus Line Items

Average Annual Return, Label [Optional Text]

MSCI USA IMI ESG Leaders Index

Average Annual Return, Percent

18.29%

14.16%

FidelitySAISustainableSectorFundFidelitySAISustainableUSEquityFund-ComboPRO | Fidelity SAI Sustainable U.S. Equity Fund | RS003

Prospectus Line Items

Average Annual Return, Label [Optional Text]

Russell 3000® Index

Average Annual Return, Percent

17.15%

13.60%

FidelitySustainableUSEquityFund-RetailPRO | Fidelity Sustainable U.S. Equity Fund | Fidelity Sustainable U.S. Equity Fund

Prospectus Line Items

Management Fees (as a percentage of Assets)

^[21]

0.59%

Distribution and Service (12b-1) Fees

0.00%

Other Expenses (as a percentage of Assets):

0.51%

Expenses (as a percentage of Assets)

1.10%

Fee Waiver or Reimbursement

^[22]

(0.20%)

Net Expenses (as a percentage of Assets)

0.90%

Expense Example, with Redemption, 1 Year

$ 92

Expense Example, with Redemption, 3 Years

323

Expense Example, with Redemption, 5 Years

580

Expense Example, with Redemption, 10 Years

$ 1,316

Annual Return, Inception Date

Jun. 15, 2021

Average Annual Return, Label [Optional Text]

Return Before Taxes

Average Annual Return, Percent

15.41%

10.12%

^[23]

Annual Return [Percent]

15.41%

20.18%

24.70%

(19.61%)

FidelitySustainableUSEquityFund-RetailPRO | Fidelity Sustainable U.S. Equity Fund

Prospectus Line Items

Risk/Return [Heading]

Fund Summary Fund /Class: Fidelity® Sustainable U.S. Equity Fund /Fidelity® Sustainable U.S. Equity Fund

Objective [Heading]

Investment Objective

Objective, Primary [Text Block]

Fidelity® Sustainable U.S. Equity Fund seeks long-term growth of capital.

Expense Heading [Optional Text]

Fee Table

Expense Narrative [Text Block]

Shareholder Fees Caption [Optional Text]

Shareholder fees

Shareholder Fee, Other

$ 0

Operating Expenses Caption [Optional Text]

Annual Operating Expenses

Fee Waiver or Reimbursement over Assets, Date of Termination

Sep. 30, 2027

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

51.00%

Expense Example Narrative [Text Block]

Strategy [Heading]

Principal Investment Strategies

Strategy Narrative [Text Block]

Bar Chart and Performance Table [Heading]

Performance

Performance Narrative [Text Block]

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The additional index has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

Performance Availability Website Address [Text]

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

Year-by-Year Returns

Year to Date Return, Label [Optional Text]

Year-to-Date Return

Bar Chart, Year to Date Return, Date

Jun. 30, 2026

Bar Chart, Year to Date Return

14.01%

Highest Quarterly Return, Label [Optional Text]

Highest Quarter Return

Highest Quarterly Return, Date

Jun. 30, 2025

Highest Quarterly Return

16.25%

Lowest Quarterly Return, Label [Optional Text]

Lowest Quarter Return

Lowest Quarterly Return, Date

Jun. 30, 2022

Lowest Quarterly Return

(16.63%)

Performance Table Heading

Average Annual Returns

Performance Table Uses Highest Federal Rate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

Performance Table Explanation after Tax Higher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

FidelitySustainableUSEquityFund-RetailPRO | Fidelity Sustainable U.S. Equity Fund | After Taxes on Distributions | Fidelity Sustainable U.S. Equity Fund

Prospectus Line Items

Average Annual Return, Label [Optional Text]

Return After Taxes on Distributions

Average Annual Return, Percent

15.41%

10.00%

^[23]

FidelitySustainableUSEquityFund-RetailPRO | Fidelity Sustainable U.S. Equity Fund | After Taxes on Distributions and Sales | Fidelity Sustainable U.S. Equity Fund

Prospectus Line Items

Average Annual Return, Label [Optional Text]

Return After Taxes on Distributions and Sale of Fund Shares

Average Annual Return, Percent

9.12%

7.97%

^[23]

FidelitySustainableUSEquityFund-RetailPRO | Fidelity Sustainable U.S. Equity Fund | IXSLM

Prospectus Line Items

Average Annual Return, Label [Optional Text]

MSCI USA IMI ESG Leaders Index

Average Annual Return, Percent

18.29%

12.08%

FidelitySustainableUSEquityFund-RetailPRO | Fidelity Sustainable U.S. Equity Fund | RS003

Prospectus Line Items

Average Annual Return, Label [Optional Text]

Russell 3000® Index

Average Annual Return, Percent

17.15%

11.36%

FidelityClimateActionFund-RetailPRO | Fidelity Climate Action Fund | Fidelity Climate Action Fund

Prospectus Line Items

Management Fees (as a percentage of Assets)

^[24]

0.80%

Distribution and Service (12b-1) Fees

0.00%

Other Expenses (as a percentage of Assets):

0.36%

Expenses (as a percentage of Assets)

1.16%

Fee Waiver or Reimbursement

^[25]

(0.11%)

Net Expenses (as a percentage of Assets)

1.05%

Expense Example, with Redemption, 1 Year

$ 107

Expense Example, with Redemption, 3 Years

354

Expense Example, with Redemption, 5 Years

624

Expense Example, with Redemption, 10 Years

$ 1,396

Annual Return, Inception Date

Jun. 15, 2021

Average Annual Return, Label [Optional Text]

Return Before Taxes

Average Annual Return, Percent

21.27%

9.18%

^[26]

Annual Return [Percent]

21.27%

24.06%

19.06%

(25.29%)

FidelityClimateActionFund-RetailPRO | Fidelity Climate Action Fund

Prospectus Line Items

Risk/Return [Heading]

Fund Summary Fund /Class: Fidelity® Climate Action Fund /Fidelity® Climate Action Fund

Objective [Heading]

Investment Objective

Objective, Primary [Text Block]

Fidelity® Climate Action Fund seeks long-term growth of capital.

Expense Heading [Optional Text]

Fee Table

Expense Narrative [Text Block]

Shareholder Fees Caption [Optional Text]

Shareholder fees

Shareholder Fee, Other

$ 0

Operating Expenses Caption [Optional Text]

Annual Operating Expenses

Fee Waiver or Reimbursement over Assets, Date of Termination

Sep. 30, 2027

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

31.00%

Expense Example Narrative [Text Block]

Strategy [Heading]

Principal Investment Strategies

Strategy Narrative [Text Block]

Bar Chart and Performance Table [Heading]

Performance

Performance Narrative [Text Block]

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The additional index has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

Performance Availability Website Address [Text]

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

Year-by-Year Returns

Year to Date Return, Label [Optional Text]

Year-to-Date Return

Bar Chart, Year to Date Return, Date

Jun. 30, 2026

Bar Chart, Year to Date Return

16.47%

Highest Quarterly Return, Label [Optional Text]

Highest Quarter Return

Highest Quarterly Return, Date

Jun. 30, 2025

Highest Quarterly Return

12.59%

Lowest Quarterly Return, Label [Optional Text]

Lowest Quarter Return

Lowest Quarterly Return, Date

Jun. 30, 2022

Lowest Quarterly Return

(18.67%)

Performance Table Heading

Average Annual Returns

Performance Table Uses Highest Federal Rate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

Performance Table Explanation after Tax Higher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

FidelityClimateActionFund-RetailPRO | Fidelity Climate Action Fund | After Taxes on Distributions | Fidelity Climate Action Fund

Prospectus Line Items

Average Annual Return, Label [Optional Text]

Return After Taxes on Distributions

Average Annual Return, Percent

21.27%

9.17%

^[26]

FidelityClimateActionFund-RetailPRO | Fidelity Climate Action Fund | After Taxes on Distributions and Sales | Fidelity Climate Action Fund

Prospectus Line Items

Average Annual Return, Label [Optional Text]

Return After Taxes on Distributions and Sale of Fund Shares

Average Annual Return, Percent

12.59%

7.23%

^[26]

FidelityClimateActionFund-RetailPRO | Fidelity Climate Action Fund | IXWC6

Prospectus Line Items

Average Annual Return, Label [Optional Text]

MSCI World Climate Change Index

Average Annual Return, Percent

20.13%

12.41%

FidelityClimateActionFund-RetailPRO | Fidelity Climate Action Fund | MS113

Prospectus Line Items

Average Annual Return, Label [Optional Text]

MSCI World Index

Average Annual Return, Percent

21.51%

10.83%

FidelityAgriculturalProductivityWaterSustainabilityFunds-ComboPRO | Fidelity Agricultural Productivity Fund | Fidelity Agricultural Productivity Fund

Prospectus Line Items

Management Fees (as a percentage of Assets)

0.81%

Distribution and Service (12b-1) Fees

0.00%

Other Expenses (as a percentage of Assets):

0.20%

Expenses (as a percentage of Assets)

1.01%

Fee Waiver or Reimbursement

^[27]

(0.06%)

Net Expenses (as a percentage of Assets)

0.95%

Expense Example, with Redemption, 1 Year

$ 97

Expense Example, with Redemption, 3 Years

313

Expense Example, with Redemption, 5 Years

550

Expense Example, with Redemption, 10 Years

$ 1,229

Annual Return, Inception Date

Apr. 16, 2020

Average Annual Return, Label [Optional Text]

Return Before Taxes

Average Annual Return, Percent

8.00%

4.96%

12.47%

^[28]

Annual Return [Percent]

8.00%

(4.85%)

(11.60%)

13.69%

23.35%

FidelityAgriculturalProductivityWaterSustainabilityFunds-ComboPRO | Fidelity Agricultural Productivity Fund

Prospectus Line Items

Risk/Return [Heading]

Fund Summary Fund: Fidelity® Agricultural Productivity Fund

Objective [Heading]

Investment Objective

Objective, Primary [Text Block]

Fidelity® Agricultural Productivity Fund seeks long-term growth of capital.

Expense Heading [Optional Text]

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, which are not reflected in the tables and examples below.

Shareholder Fees Caption [Optional Text]

Shareholder fees

Shareholder Fee, Other

$ 0

Operating Expenses Caption [Optional Text]

Annual Operating Expenses

Fee Waiver or Reimbursement over Assets, Date of Termination

Sep. 30, 2027

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

44.00%

Expense Example Narrative [Text Block]

Strategy [Heading]

Principal Investment Strategies

Strategy Narrative [Text Block]

Normally investing at least 80% of assets in securities of agricultural productivity companies. Agricultural productivity companies include those contained in the MSCI ACWI Select Agriculture Producers IMI 25/50 Index or those that, in Fidelity Management & Research Company LLC's (FMR) (the Adviser) opinion, help to increase crop yields and/or grow food production amid a backdrop of a growing global population and declining per capita supply of arable land. Such companies may include but are not limited to companies principally engaged in farm machinery, farm machinery parts and equipment, irrigation, agricultural efficiency and services, agricultural science and biotechnology, fertilizers, pesticide and crop protection, seed manufacturers, crop chemicals, agricultural products and processors, processed food producers, aquatic farming, and livestock services. For purposes of the fund's policy to normally invest at least 80% of its assets in securities of companies principally engaged in the business activity or activities identified for the fund, Fidelity may consider a company to be principally engaged in the designated business activity or activities based on: (i) the level of a company's assets, income, sales, or profits that are committed to, derived from, or related to the designated business activity or activities, or (ii) whether a third party has given the company an industry or sector classification consistent with the designated business activity or activities. Whether a company is principally engaged in the designated business activity or activities can be determined under any of these factors. Derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments 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 equity securities. Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments. Investing in either "growth" stocks or "value" stocks or both. Investing in securities of domestic and foreign issuers.

Bar Chart and Performance Table [Heading]

Performance

Performance Narrative [Text Block]

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The additional index has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

Performance Availability Website Address [Text]

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

Year-by-Year Returns

Year to Date Return, Label [Optional Text]

Year-to-Date Return

Bar Chart, Year to Date Return, Date

Jun. 30, 2026

Bar Chart, Year to Date Return

20.22%

Highest Quarterly Return, Label [Optional Text]

Highest Quarter Return

Highest Quarterly Return, Date

Mar. 31, 2021

Highest Quarterly Return

19.44%

Lowest Quarterly Return, Label [Optional Text]

Lowest Quarter Return

Lowest Quarterly Return, Date

Jun. 30, 2022

Lowest Quarterly Return

(17.42%)

Performance Table Heading

Average Annual Returns

Performance Table Uses Highest Federal Rate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

Performance Table Explanation after Tax Higher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

FidelityAgriculturalProductivityWaterSustainabilityFunds-ComboPRO | Fidelity Agricultural Productivity Fund | After Taxes on Distributions | Fidelity Agricultural Productivity Fund

Prospectus Line Items

Average Annual Return, Label [Optional Text]

Return After Taxes on Distributions

Average Annual Return, Percent

7.54%

4.60%

12.11%

^[28]

FidelityAgriculturalProductivityWaterSustainabilityFunds-ComboPRO | Fidelity Agricultural Productivity Fund | After Taxes on Distributions and Sales | Fidelity Agricultural Productivity Fund

Prospectus Line Items

Average Annual Return, Label [Optional Text]

Return After Taxes on Distributions and Sale of Fund Shares

Average Annual Return, Percent

5.08%

3.86%

10.05%

^[28]

FidelityAgriculturalProductivityWaterSustainabilityFunds-ComboPRO | Fidelity Agricultural Productivity Fund | IXXIQ

Prospectus Line Items

Average Annual Return, Label [Optional Text]

MSCI ACWI Select Agriculture Producers IMI 25/50 Index

Average Annual Return, Percent

12.01%

5.29%

13.13%

FidelityAgriculturalProductivityWaterSustainabilityFunds-ComboPRO | Fidelity Agricultural Productivity Fund | MS159

Prospectus Line Items

Average Annual Return, Label [Optional Text]

MSCI ACWI (All Country World Index) Index

Average Annual Return, Percent

22.71%

11.56%

16.72%

FidelityAgriculturalProductivityWaterSustainabilityFunds-ComboPRO | Fidelity Water Sustainability Fund | Fidelity Water Sustainability Fund

Prospectus Line Items

Management Fees (as a percentage of Assets)

0.81%

Distribution and Service (12b-1) Fees

0.00%

Other Expenses (as a percentage of Assets):

0.07%

Expenses (as a percentage of Assets)

0.88%

Expense Example, with Redemption, 1 Year

$ 90

Expense Example, with Redemption, 3 Years

281

Expense Example, with Redemption, 5 Years

488

Expense Example, with Redemption, 10 Years

$ 1,084

Annual Return, Inception Date

Apr. 16, 2020

Average Annual Return, Label [Optional Text]

Return Before Taxes

Average Annual Return, Percent

18.04%

9.39%

14.14%

^[29]

Annual Return [Percent]

18.04%

8.77%

18.58%

(19.94%)

28.52%

FidelityAgriculturalProductivityWaterSustainabilityFunds-ComboPRO | Fidelity Water Sustainability Fund

Prospectus Line Items

Risk/Return [Heading]

Fund Summary Fund: Fidelity® Water Sustainability Fund

Objective [Heading]

Investment Objective

Objective, Primary [Text Block]

Fidelity® Water Sustainability Fund seeks long-term growth of capital.

Expense Heading [Optional Text]

Fee Table

Expense Narrative [Text Block]

Shareholder Fees Caption [Optional Text]

Shareholder fees

Shareholder Fee, Other

$ 0

Operating Expenses Caption [Optional Text]

Annual Operating Expenses

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

47.00%

Expense Example Narrative [Text Block]

Strategy [Heading]

Principal Investment Strategies

Strategy Narrative [Text Block]

Normally investing at least 80% of assets in securities of water sustainability companies. Water sustainability companies include those contained in the S&P ® Global Water Index or those that, in Fidelity Management & Research Company LLC's (FMR) (the Adviser) opinion, are developing efficiencies, extending the life cycle and/or identifying affordable new technologies to deliver safe, reliable or easily accessible water. Such companies may include but are not limited to companies principally engaged in water resources, water treatment, water distribution and utilities, desalinization or purification facilities, water technologies and analytics, environmental water services and water infrastructure (pumps, valves, meters, pipes), irrigation, water conservation services, and water supply or processing services. For purposes of the fund's policy to normally invest at least 80% of its assets in securities of companies principally engaged in the business activity or activities identified for the fund, Fidelity may consider a company to be principally engaged in the designated business activity or activities based on: (i) the level of a company's assets, income, sales, or profits that are committed to, derived from, or related to the designated business activity or activities, or (ii) whether a third party has given the company an industry or sector classification consistent with the designated business activity or activities. Whether a company is principally engaged in the designated business activity or activities can be determined under any of these factors. Derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments 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 equity securities. Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments. Investing in either "growth" stocks or "value" stocks or both. Investing in securities of domestic and foreign issuers. Employing sustainable investing exclusion criteria to avoid investments in issuers that are directly engaged in, and/or derive significant revenue from, certain industries. Please see "Fund Basics - Investment Details - Sustainable Investing Exclusions" for additional information.

Bar Chart and Performance Table [Heading]

Performance

Performance Narrative [Text Block]

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The additional index has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

Performance Availability Website Address [Text]

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

Year-by-Year Returns

Year to Date Return, Label [Optional Text]

Year-to-Date Return

Bar Chart, Year to Date Return, Date

Jun. 30, 2026

Bar Chart, Year to Date Return

4.83%

Highest Quarterly Return, Label [Optional Text]

Highest Quarter Return

Highest Quarterly Return, Date

Dec. 31, 2022

Highest Quarterly Return

13.56%

Lowest Quarterly Return, Label [Optional Text]

Lowest Quarter Return

Lowest Quarterly Return, Date

Jun. 30, 2022

Lowest Quarterly Return

(17.82%)

Performance Table Heading

Average Annual Returns

Performance Table Uses Highest Federal Rate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

Performance Table Explanation after Tax Higher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

FidelityAgriculturalProductivityWaterSustainabilityFunds-ComboPRO | Fidelity Water Sustainability Fund | After Taxes on Distributions | Fidelity Water Sustainability Fund

Prospectus Line Items

Average Annual Return, Label [Optional Text]

Return After Taxes on Distributions

Average Annual Return, Percent

17.14%

8.98%

13.65%

^[29]

FidelityAgriculturalProductivityWaterSustainabilityFunds-ComboPRO | Fidelity Water Sustainability Fund | After Taxes on Distributions and Sales | Fidelity Water Sustainability Fund

Prospectus Line Items

Average Annual Return, Label [Optional Text]

Return After Taxes on Distributions and Sale of Fund Shares

Average Annual Return, Percent

11.17%

7.37%

11.34%

^[29]

FidelityAgriculturalProductivityWaterSustainabilityFunds-ComboPRO | Fidelity Water Sustainability Fund | MS159

Prospectus Line Items

Average Annual Return, Label [Optional Text]

MSCI ACWI (All Country World Index) Index

Average Annual Return, Percent

22.71%

11.56%

16.72%

FidelityAgriculturalProductivityWaterSustainabilityFunds-ComboPRO | Fidelity Water Sustainability Fund | SP222

Prospectus Line Items

Average Annual Return, Label [Optional Text]

S&P® Global Water Index

Average Annual Return, Percent

18.75%

8.53%

13.81%

Document Type

485BPOS

Registrant Name

Fidelity Summer Street Trust

[1]	A Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% and 0.25%, respectively.
[2]	A The management fee comprises a basic fee, which may vary by class, that is adjusted up or down by a maximum of 0.10% based on the performance of the fund or a designated class of the fund relative to that of the MSCI World Index. Please see "Fund Services - Fund Management - Advisory Fee(s)" for additional information.
[3]	B Fidelity Management & Research Company LLC (FMR) has contractually agreed to reimburse Class A, Class M, Class C, Class I, and Class Z of the fund to the extent that total operating expenses (excluding interest, certain taxes, fees and expenses of the Independent Trustees, proxy and shareholder meeting expenses, extraordinary expenses, and acquired fund fees and expenses (including fees and expenses associated with a wholly owned subsidiary), if any, as well as non-operating expenses such as brokerage commissions and fees and expenses associated with the fund's securities lending program, if applicable), as a percentage of their respective average net assets, exceed 1.30%, 1.55%, 2.05%, 1.05%, and 0.90% (the Expense Caps). If at any time during the current fiscal year expenses for Class A, Class M, Class C, Class I, or Class Z of the fund fall below the Expense Caps, FMR reserves the right to recoup through the end of the fiscal year any expenses that were reimbursed during the current fiscal year up to, but not in excess of, the Expense Caps. These arrangements will remain in effect through September 30, 2027 . FMR may not terminate these arrangements before the expiration date without the approval of the Board of Trustees and may extend them in its discretion after that date.
[4]	A From June 15, 2021 .
[5]	B From June 15, 2021 .
[6]	B On Class C shares redeemed less than one year after purchase.
[7]	C From June 15, 2021 .
[8]	D From June 15, 2021 .
[9]	E From June 15, 2021 .
[10]	A Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% and 0.25%, respectively.
[11]	A The management fee comprises a basic fee, which may vary by class, that is adjusted up or down by a maximum of 0.10% based on the performance of the fund or a designated class of the fund relative to that of the Russell 3000® Index. Please see "Fund Services - Fund Management - Advisory Fee(s)" for additional information.
[12]	B Fidelity Management & Research Company LLC (FMR) has contractually agreed to reimburse Class A, Class M, Class C, Class I, and Class Z of the fund to the extent that total operating expenses (excluding interest, certain taxes, fees and expenses of the Independent Trustees, proxy and shareholder meeting expenses, extraordinary expenses, and acquired fund fees and expenses (including fees and expenses associated with a wholly owned subsidiary), if any, as well as non-operating expenses such as brokerage commissions and fees and expenses associated with the fund's securities lending program, if applicable), as a percentage of their respective average net assets, exceed 1.15%, 1.40%, 1.90%, 0.90%, and 0.75% (the Expense Caps). If at any time during the current fiscal year expenses for Class A, Class M, Class C, Class I, or Class Z of the fund fall below the Expense Caps, FMR reserves the right to recoup through the end of the fiscal year any expenses that were reimbursed during the current fiscal year up to, but not in excess of, the Expense Caps. These arrangements will remain in effect through September 30, 2027 . FMR may not terminate these arrangements before the expiration date without the approval of the Board of Trustees and may extend them in its discretion after that date.
[13]	A From June 15, 2021 .
[14]	B From June 15, 2021 .
[15]	B On Class C shares redeemed less than one year after purchase.
[16]	C From June 15, 2021 .
[17]	D From June 15, 2021 .
[18]	E From June 15, 2021 .
[19]	A From April 14, 2022 .
[20]	A From April 14, 2022 .
[21]	A The management fee comprises a basic fee, which may vary by class, that is adjusted up or down by a maximum of 0.10% based on the performance of the fund or a designated class of the fund relative to that of the Russell 3000® Index. Please see "Fund Services - Fund Management - Advisory Fee(s)" for additional information.
[22]	B Fidelity Management & Research Company LLC (FMR) has contractually agreed to reimburse the class of shares of the fund to the extent that total operating expenses (excluding interest, certain taxes, fees and expenses of the Independent Trustees, proxy and shareholder meeting expenses, extraordinary expenses, and acquired fund fees and expenses (including fees and expenses associated with a wholly owned subsidiary), if any, as well as non-operating expenses such as brokerage commissions and fees and expenses associated with the fund's securities lending program, if applicable), as a percentage of its average net assets, exceed 0.90% (the Expense Cap). If at any time during the current fiscal year expenses for the class of shares of the fund fall below the Expense Cap, FMR reserves the right to recoup through the end of the fiscal year any expenses that were reimbursed during the current fiscal year up to, but not in excess of, the Expense Cap. This arrangement will remain in effect through September 30, 2027 . FMR may not terminate this arrangement before the expiration date without the approval of the Board of Trustees and may extend it in its discretion after that date.
[23]	A From June 15, 2021 .
[24]	A The management fee comprises a basic fee, which may vary by class, that is adjusted up or down by a maximum of 0.10% based on the performance of the fund or a designated class of the fund relative to that of the MSCI World Index. Please see "Fund Services - Fund Management - Advisory Fee(s)" for additional information.
[25]	B Fidelity Management & Research Company LLC (FMR) has contractually agreed to reimburse the class of shares of the fund to the extent that total operating expenses (excluding interest, certain taxes, fees and expenses of the Independent Trustees, proxy and shareholder meeting expenses, extraordinary expenses, and acquired fund fees and expenses (including fees and expenses associated with a wholly owned subsidiary), if any, as well as non-operating expenses such as brokerage commissions and fees and expenses associated with the fund's securities lending program, if applicable), as a percentage of its average net assets, exceed 1.05% (the Expense Cap). If at any time during the current fiscal year expenses for the class of shares of the fund fall below the Expense Cap, FMR reserves the right to recoup through the end of the fiscal year any expenses that were reimbursed during the current fiscal year up to, but not in excess of, the Expense Cap. This arrangement will remain in effect through September 30, 2027 . FMR may not terminate this arrangement before the expiration date without the approval of the Board of Trustees and may extend it in its discretion after that date.
[26]	A From June 15, 2021 .
[27]	A Fidelity Management & Research Company LLC (FMR) has contractually agreed to reimburse the fund to the extent that total operating expenses (excluding interest, certain taxes, fees and expenses of the Independent Trustees, proxy and shareholder meeting expenses, extraordinary expenses, and acquired fund fees and expenses (including fees and expenses associated with a wholly owned subsidiary), if any, as well as non-operating expenses such as brokerage commissions and fees and expenses associated with the fund's securities lending program, if applicable), as a percentage of its average net assets, exceed 0.95% (the Expense Cap). If at any time during the current fiscal year expenses for the fund fall below the Expense Cap, FMR reserves the right to recoup through the end of the fiscal year any expenses that were reimbursed during the current fiscal year up to, but not in excess of, the Expense Cap. This arrangement will remain in effect through September 30, 2027 . FMR may not terminate this arrangement before the expiration date without the approval of the Board of Trustees and may extend it in its discretion after that date.
[28]	A From April 16, 2020 .
[29]	A From April 16, 2020 .