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Shareholder Report
 6 Months Ended
Jun. 30, 2026
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, 2026
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, 2026 to June 30, 2026.
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 
$ 42 
0.77%
  
Expenses Paid, Amount $ 42
Expense Ratio, Percent 0.77%
Net Assets $ 5,021,722,454
Holdings Count | shares 100
Investment Company Portfolio Turnover 123.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of June 30, 2026)
 
KEY FACTS 
  
  
Fund Size
$5,021,722,454
  
Number of Holdings
100
  
Portfolio Turnover
123%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Information Technology 43.3   Industrials 22.9   Communication Services 13.8   Consumer Discretionary 10.2   Health Care 3.9   Financials 1.5   Real Estate 1.2   Materials 1.2   Consumer Staples 0.5   Utilities 0.2     Common Stocks 97.3 Preferred Stocks 1.4 Short-Term Investments and Net Other Assets (Liabilities) 1.3 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 97.3                       Preferred Stocks - 1.4                     Short-Term Investments and Net Other Assets (Liabilities) - 1.3   United States 98.1 Taiwan 1.0 Canada 0.6 France 0.1 Italy 0.1 Australia 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 98.1                       Taiwan - 1.0                               Canada - 0.6                               France - 0.1                               Italy - 0.1                                Australia - 0.1                               
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     NVIDIA Corp 14.2   Alphabet Inc Class A 10.7   Broadcom Inc 4.1   Micron Technology Inc 4.0   Tesla Inc 3.5   Eli Lilly & Co 3.4   Meta Platforms Inc Class A 2.8   Howmet Aerospace Inc 2.7   Sterling Infrastructure Inc 2.7   Sandisk Corp 2.1     50.2