v3.26.3
Shareholder Report
 6 Months Ended
Jul. 31, 2026
USD ($)
shares
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Fidelity Select Portfolios
Entity Central Index Key 0000320351
Entity Investment Company Type N-1A
Document Period End Date Jul. 31, 2026
Fidelity Telecom and Utilities Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® Telecom and Utilities Fund
Class Name Fidelity® Telecom and Utilities Fund
Trading Symbol FIUIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Telecom and Utilities Fund for the period February 1, 2026 to July 31, 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® Telecom and Utilities Fund 
$ 36 
0.71%
  
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.71%
Net Assets $ 1,321,669,655
Holdings Count | shares 47
Investment Company Portfolio Turnover 60.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of July 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$1,321,669,655
  
Number of Holdings
47
  
Portfolio Turnover
60%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Electric Utilities 50.5   Diversified Telecommunication Services 18.4   Multi-Utilities 16.1   Independent Power and Renewable Electricity Producers 5.1   Commercial Services & Supplies 3.2   Wireless Telecommunication Services 2.7   Electrical Equipment 1.9   Construction & Engineering 1.2   Interactive Media & Services 0.6   Others 0.1       Common Stocks 99.8 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.8                       Short-Term Investments and Net Other Assets (Liabilities) - 0.2   United States 99.4 Germany 0.5 Canada 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 99.4                       Germany - 0.5                              Canada - 0.1                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     NextEra Energy Inc 10.7   Verizon Communications Inc 9.1   American Electric Power Co Inc 5.9   AT&T Inc 5.7   NRG Energy Inc 5.3   Constellation Energy Corp 4.6   Sempra 4.6   Xcel Energy Inc 4.3   Entergy Corp 4.1   Vistra Corp 3.9     58.2