Investment Risks	Feb. 28, 2026
FidelityTrendFund-RetailPRO | Fidelity Trend Fund | Risk Nondiversified Status [Member]
Prospectus Line Items
Risk [Text Block]	In addition, the fund is classified as non-diversified under the Investment Company Act of 1940 (1940 Act), which means that it has the ability to invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.
FidelityTrendFund-RetailPRO | Fidelity Trend Fund | Risk Lose Money [Member]
Prospectus Line Items
Risk [Text Block]	You could lose money by investing in the fund.
FidelityTrendFund-RetailPRO | Fidelity Trend Fund | Risk Not Insured Depository Institution [Member]
Prospectus Line Items
Risk [Text Block]	An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency .
FidelityTrendFund-RetailPRO | Fidelity Trend Fund | GrowthInvestingMember
Prospectus Line Items
Risk [Text Block]	"Growth" Investing. "Growth" stocks can perform differently from the market as a whole and other types of stocks and can be more volatile than other types of stocks.
FidelityTrendFund-RetailPRO | Fidelity Trend Fund | ForeignExposureMember
Prospectus Line Items
Risk [Text Block]	Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.
FidelityTrendFund-RetailPRO | Fidelity Trend Fund | IssuerSpecificChangesMember
Prospectus Line Items
Risk [Text Block]	Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole.
FidelityTrendFund-RetailPRO | Fidelity Trend Fund | StockMarketVolatilityMember
Prospectus Line Items
Risk [Text Block]	Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.
Document Type	485BPOS