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Shareholder Report
 6 Months Ended
Jun. 30, 2024
USD ($)
shares
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Fidelity Trend Fund
Entity Central Index Key 0000035402
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2024
Fidelity Trend Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® Trend Fund
Class Name Fidelity® Trend Fund
Trading Symbol FTRNX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Trend Fund for the period January 1, 2024 to June 30, 2024.
Shareholder Report Annual or Semi-Annual semi-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 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-800-544-8544
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 six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Fidelity® Trend Fund 
$ 32 
0.58%
  
Expenses Paid, Amount $ 32
Expense Ratio, Percent 0.58%
Net Assets $ 3,570,346,726
Holdings Count | shares 81
Investment Company Portfolio Turnover 65.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of June 30, 2024)
 
KEY FACTS 
  
  
Fund Size
$3,570,346,726
 
  
Number of Holdings
81
 
  
Portfolio Turnover
65%
 
  
Holdings [Text Block]   MARKET SECTORS (% of Fund's net assets)     Information Technology 47.2   Industrials 17.5   Consumer Discretionary 15.2   Communication Services 10.5   Financials 3.3   Health Care 3.2   Real Estate 1.0   Utilities 0.4   Consumer Staples 0.3     Common Stocks 98.6 Short-Term Investments and Net Other Assets (Liabilities) 1.4 ASSET ALLOCATION (% of Fund's net assets) United States 94.4 Italy 1.0 Netherlands 0.9 France 0.8 Germany 0.7 Canada 0.5 Taiwan 0.5 Japan 0.5 China 0.3 Others 0.4 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     NVIDIA Corp 12.7     Microsoft Corp 10.0     Apple Inc 8.9     Amazon.com Inc 8.1     Meta Platforms Inc Class A 4.7     Alphabet Inc Class A 3.8     Eli Lilly & Co 2.6     Fair Isaac Corp 2.0     Micron Technology Inc 1.8     Broadcom Inc 1.7       56.3