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Shareholder Report
 6 Months Ended
Aug. 31, 2024
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 Aug. 31, 2024
Fidelity Natural Resources Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® Natural Resources Fund
Class Name Fidelity® Natural Resources Fund
Trading Symbol FNARX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Natural Resources Fund for the period March 1, 2024 to August 31, 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® Natural Resources Fund 
$ 37 
0.70%
  
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.70%
Net Assets $ 648,226,804
Holdings Count | shares 38
Investment Company Portfolio Turnover 56.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$648,226,804
 
  
Number of Holdings
38
 
  
Portfolio Turnover
56%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Oil, Gas & Consumable Fuels 70.1   Metals & Mining 18.0   Containers & Packaging 6.3   Energy Equipment & Services 4.9       Common Stocks 99.3 Short-Term Investments and Net Other Assets (Liabilities) 0.7 ASSET ALLOCATION (% of Fund's net assets) United States 58.8 Canada 29.5 Portugal 4.8 Zambia 2.5 United Kingdom 1.8 Brazil 1.6 Ghana 1.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Exxon Mobil Corp 22.5     Imperial Oil Ltd 8.9     Shell PLC ADR 8.3     MEG Energy Corp 5.6     Valero Energy Corp 4.9     Galp Energia SGPS SA 4.8     Phillips 66 3.4     Athabasca Oil Corp 3.1     Agnico Eagle Mines Ltd (United States) 2.8     Freeport-McMoRan Inc 2.7       67.0  
Select Utilities Portfolio  
Shareholder Report [Line Items]  
Fund Name Utilities Portfolio
Class Name Utilities Portfolio
Trading Symbol FSUTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Utilities Portfolio for the period March 1, 2024 to August 31, 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
 
Utilities Portfolio 
$ 38 
0.67%
  
Expenses Paid, Amount $ 38
Expense Ratio, Percent 0.67%
Net Assets $ 1,538,756,649
Holdings Count | shares 31
Investment Company Portfolio Turnover 55.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,538,756,649
 
  
Number of Holdings
31
 
  
Portfolio Turnover
55%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Electric Utilities 62.2   Multi-Utilities 25.2   Independent Power and Renewable Electricity Producers 9.5   Gas Utilities 2.1       Common Stocks 99.0 Short-Term Investments and Net Other Assets (Liabilities) 1.0 ASSET ALLOCATION (% of Fund's net assets) United States 100.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     NextEra Energy Inc 13.0     Sempra 7.1     PG&E Corp 6.3     Edison International 6.0     American Electric Power Co Inc 5.4     Public Service Enterprise Group Inc 5.3     Entergy Corp 4.8     Constellation Energy Corp 4.8     Eversource Energy 4.5     FirstEnergy Corp 4.2       61.4  
Fidelity Advisor Consumer Staples Fund - Class Z  
Shareholder Report [Line Items]  
Fund Name Consumer Staples Portfolio
Class Name Fidelity Advisor® Consumer Staples Fund Class Z
Trading Symbol FIJCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Consumer Staples Portfolio for the period March 1, 2024 to August 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
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
 
Class Z 
$ 31 
0.58%
  
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.58%
Net Assets $ 1,405,206,341
Holdings Count | shares 39
Investment Company Portfolio Turnover 39.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,405,206,341
 
  
Number of Holdings
39
 
  
Portfolio Turnover
39%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Beverages 39.6   Household Products 18.8   Food Products 14.3   Consumer Staples Distribution & Retail 10.8   Personal Care Products 9.7   Tobacco 6.4   Oil, Gas & Consumable Fuels 0.1       Common Stocks 99.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) United States 95.1 United Kingdom 4.8 Canada 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Coca-Cola Co/The 14.2     Procter & Gamble Co/The 14.2     Keurig Dr Pepper Inc 9.8     Kenvue Inc 6.3     Walmart Inc 5.5     Philip Morris International Inc 4.2     Monster Beverage Corp 3.9     Energizer Holdings Inc 3.8     PepsiCo Inc 3.6     Estee Lauder Cos Inc/The Class A 3.4       68.9  
Fidelity Advisor Consumer Staples Fund - Class M  
Shareholder Report [Line Items]  
Fund Name Consumer Staples Portfolio
Class Name Fidelity Advisor® Consumer Staples Fund Class M
Trading Symbol FDTGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Consumer Staples Portfolio for the period March 1, 2024 to August 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
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
 
Class M 
$ 64 
1.22%
  
Expenses Paid, Amount $ 64
Expense Ratio, Percent 1.22%
Net Assets $ 1,405,206,341
Holdings Count | shares 39
Investment Company Portfolio Turnover 39.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,405,206,341
 
  
Number of Holdings
39
 
  
Portfolio Turnover
39%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Beverages 39.6   Household Products 18.8   Food Products 14.3   Consumer Staples Distribution & Retail 10.8   Personal Care Products 9.7   Tobacco 6.4   Oil, Gas & Consumable Fuels 0.1       Common Stocks 99.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) United States 95.1 United Kingdom 4.8 Canada 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Coca-Cola Co/The 14.2     Procter & Gamble Co/The 14.2     Keurig Dr Pepper Inc 9.8     Kenvue Inc 6.3     Walmart Inc 5.5     Philip Morris International Inc 4.2     Monster Beverage Corp 3.9     Energizer Holdings Inc 3.8     PepsiCo Inc 3.6     Estee Lauder Cos Inc/The Class A 3.4       68.9  
Fidelity Advisor Gold Fund - Class Z  
Shareholder Report [Line Items]  
Fund Name Gold Portfolio
Class Name Fidelity Advisor® Gold Fund Class Z
Trading Symbol FIJDX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Gold Portfolio for the period March 1, 2024 to August 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
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
 
Class Z 
$ 37 
0.60%
  
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.60%
Net Assets $ 1,501,574,716
Holdings Count | shares 65
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,501,574,716
 
  
Number of Holdings
65
 
  
Portfolio Turnover
13%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Metals & Mining* 98.4   Financial Services 0.0     *Includes gold bullion and/or silver bullion.   Common Stocks 98.4 Other Investments 0.9 Short-Term Investments and Net Other Assets (Liabilities) 0.7 ASSET ALLOCATION (% of Fund's net assets) Canada 60.3 United States 15.8 Brazil 10.3 Australia 6.3 United Kingdom 2.3 South Africa 1.9 China 1.5 Burkina Faso 1.3 Egypt 0.3 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Agnico Eagle Mines Ltd 14.8     Newmont Corp 11.6     Wheaton Precious Metals Corp 10.3     Franco-Nevada Corp 9.3     Barrick Gold Corp 4.9     Alamos Gold Inc Class A 4.1     Northern Star Resources Ltd 3.8     Osisko Gold Royalties Ltd 2.7     Anglogold Ashanti Plc 2.3     Lundin Gold Inc 2.3       66.1  
Fidelity Advisor Gold Fund - Class I  
Shareholder Report [Line Items]  
Fund Name Gold Portfolio
Class Name Fidelity Advisor® Gold Fund Class I
Trading Symbol FGDIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Gold Portfolio for the period March 1, 2024 to August 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
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
 
Class I 
$ 45 
0.72%
  
Expenses Paid, Amount $ 45
Expense Ratio, Percent 0.72%
Net Assets $ 1,501,574,716
Holdings Count | shares 65
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,501,574,716
 
  
Number of Holdings
65
 
  
Portfolio Turnover
13%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Metals & Mining* 98.4   Financial Services 0.0     *Includes gold bullion and/or silver bullion.   Common Stocks 98.4 Other Investments 0.9 Short-Term Investments and Net Other Assets (Liabilities) 0.7 ASSET ALLOCATION (% of Fund's net assets) Canada 60.3 United States 15.8 Brazil 10.3 Australia 6.3 United Kingdom 2.3 South Africa 1.9 China 1.5 Burkina Faso 1.3 Egypt 0.3 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Agnico Eagle Mines Ltd 14.8     Newmont Corp 11.6     Wheaton Precious Metals Corp 10.3     Franco-Nevada Corp 9.3     Barrick Gold Corp 4.9     Alamos Gold Inc Class A 4.1     Northern Star Resources Ltd 3.8     Osisko Gold Royalties Ltd 2.7     Anglogold Ashanti Plc 2.3     Lundin Gold Inc 2.3       66.1  
Fidelity Advisor Consumer Staples Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Consumer Staples Portfolio
Class Name Fidelity Advisor® Consumer Staples Fund Class C
Trading Symbol FDCGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Consumer Staples Portfolio for the period March 1, 2024 to August 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
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
 
Class C 
$ 91 
1.72%
  
Expenses Paid, Amount $ 91
Expense Ratio, Percent 1.72%
Net Assets $ 1,405,206,341
Holdings Count | shares 39
Investment Company Portfolio Turnover 39.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,405,206,341
 
  
Number of Holdings
39
 
  
Portfolio Turnover
39%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Beverages 39.6   Household Products 18.8   Food Products 14.3   Consumer Staples Distribution & Retail 10.8   Personal Care Products 9.7   Tobacco 6.4   Oil, Gas & Consumable Fuels 0.1       Common Stocks 99.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) United States 95.1 United Kingdom 4.8 Canada 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Coca-Cola Co/The 14.2     Procter & Gamble Co/The 14.2     Keurig Dr Pepper Inc 9.8     Kenvue Inc 6.3     Walmart Inc 5.5     Philip Morris International Inc 4.2     Monster Beverage Corp 3.9     Energizer Holdings Inc 3.8     PepsiCo Inc 3.6     Estee Lauder Cos Inc/The Class A 3.4       68.9  
Select Software and IT Services Portfolio  
Shareholder Report [Line Items]  
Fund Name Software and IT Services Portfolio
Class Name Software and IT Services Portfolio
Trading Symbol FSCSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Software and IT Services Portfolio for the period March 1, 2024 to August 31, 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
 
Software and IT Services Portfolio 
$ 31 
0.62%
  
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.62%
Net Assets $ 10,347,141,434
Holdings Count | shares 50
Investment Company Portfolio Turnover 14.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$10,347,141,434
 
  
Number of Holdings
50
 
  
Portfolio Turnover
14%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Software 71.9   IT Services 15.5   Financial Services 5.2   Interactive Media & Services 3.6   Professional Services 1.1       Common Stocks 97.3 Short-Term Investments and Net Other Assets (Liabilities) 2.7 ASSET ALLOCATION (% of Fund's net assets) United States 95.1 Ireland 2.7 France 1.4 Canada 0.5 Netherlands 0.3 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Microsoft Corp 25.0     Adobe Inc 8.1     Salesforce Inc 7.3     Autodesk Inc 3.1     Workday Inc Class A 2.9     Palo Alto Networks Inc 2.8     Accenture PLC Class A 2.7     Oracle Corp 2.4     Alphabet Inc Class A 2.2     Atlassian Corp Class A 2.1       58.6  
Fidelity Advisor Materials Fund - Class M  
Shareholder Report [Line Items]  
Fund Name Materials Portfolio
Class Name Fidelity Advisor® Materials Fund Class M
Trading Symbol FMFTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Materials Portfolio for the period March 1, 2024 to August 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
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
 
Class M 
$ 64 
1.24%
  
Expenses Paid, Amount $ 64
Expense Ratio, Percent 1.24%
Net Assets $ 849,835,612
Holdings Count | shares 39
Investment Company Portfolio Turnover 59.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$849,835,612
 
  
Number of Holdings
39
 
  
Portfolio Turnover
59%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Chemicals 61.6   Metals & Mining 25.3   Containers & Packaging 7.9   Construction Materials 4.4       Common Stocks 99.2 Short-Term Investments and Net Other Assets (Liabilities) 0.8 ASSET ALLOCATION (% of Fund's net assets) United States 89.9 Canada 6.0 Zambia 2.4 Brazil 1.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Linde PLC 19.1     Ecolab Inc 10.2     Dow Inc 6.9     Air Products and Chemicals Inc 5.4     Freeport-McMoRan Inc 5.0     Corteva Inc 3.9     Nucor Corp 3.9     Axalta Coating Systems Ltd 3.6     Chemours Co/The 3.3     First Quantum Minerals Ltd 2.4       63.7  
Select Telecommunications Portfolio  
Shareholder Report [Line Items]  
Fund Name Telecommunications Portfolio
Class Name Telecommunications Portfolio
Trading Symbol FSTCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Telecommunications Portfolio for the period March 1, 2024 to August 31, 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
 
Telecommunications Portfolio 
$ 41 
0.76%
  
Expenses Paid, Amount $ 41
Expense Ratio, Percent 0.76%
Net Assets $ 196,158,282
Holdings Count | shares 27
Investment Company Portfolio Turnover 29.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$196,158,282
 
  
Number of Holdings
27
 
  
Portfolio Turnover
29%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Diversified Telecommunication Services 75.8   Wireless Telecommunication Services 12.7   Media 4.1   IT Services 0.6   Construction & Engineering 0.2       Common Stocks 93.4 Short-Term Investments and Net Other Assets (Liabilities) 6.6 ASSET ALLOCATION (% of Fund's net assets) United States 92.5 Puerto Rico 4.0 Belgium 3.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     AT&T Inc 23.3     Verizon Communications Inc 19.7     Lumen Technologies Inc 6.2     Cogent Communications Holdings Inc 4.9     T-Mobile US Inc 4.8     Iridium Communications Inc 4.8     Liberty Latin America Ltd Class C 4.0     Liberty Global Ltd Class C 3.5     Telephone and Data Systems Inc 3.4     Gogo Inc 2.9       77.5  
Fidelity Advisor Communication Services Fund - Class M  
Shareholder Report [Line Items]  
Fund Name Communication Services Portfolio
Class Name Fidelity Advisor® Communication Services Fund Class M
Trading Symbol FGEMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Communication Services Portfolio for the period March 1, 2024 to August 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
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
 
Class M 
$ 63 
1.21%
  
Expenses Paid, Amount $ 63
Expense Ratio, Percent 1.21%
Net Assets $ 1,564,235,226
Holdings Count | shares 49
Investment Company Portfolio Turnover 39.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,564,235,226
 
  
Number of Holdings
49
 
  
Portfolio Turnover
39%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Interactive Media & Services 52.6   Entertainment 22.6   Media 8.0   Diversified Telecommunication Services 7.9   Broadline Retail 5.3   Ground Transportation 2.5   IT Services 0.0   Consumer Staples Distribution & Retail 0.0   Software 0.0       Common Stocks 98.9 Short-Term Investments and Net Other Assets (Liabilities) 1.1 ASSET ALLOCATION (% of Fund's net assets) United States 93.7 Puerto Rico 1.8 Belgium 1.3 Singapore 1.2 China 0.7 France 0.7 Japan 0.5 Canada 0.1 United Kingdom 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Meta Platforms Inc Class A 24.9     Alphabet Inc Class A 22.6     AT&T Inc 4.8     Walt Disney Co/The 4.6     Amazon.com Inc 4.6     Netflix Inc 4.6     Charter Communications Inc Class A 2.6     Uber Technologies Inc 2.5     Liberty Media Corp-Liberty Formula One Class A 2.3     Comcast Corp Class A 2.3       75.8  
Fidelity Advisor Materials Fund - Class Z  
Shareholder Report [Line Items]  
Fund Name Materials Portfolio
Class Name Fidelity Advisor® Materials Fund Class Z
Trading Symbol FIJFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Materials Portfolio for the period March 1, 2024 to August 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
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
 
Class Z 
$ 30 
0.58%
  
Expenses Paid, Amount $ 30
Expense Ratio, Percent 0.58%
Net Assets $ 849,835,612
Holdings Count | shares 39
Investment Company Portfolio Turnover 59.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$849,835,612
 
  
Number of Holdings
39
 
  
Portfolio Turnover
59%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Chemicals 61.6   Metals & Mining 25.3   Containers & Packaging 7.9   Construction Materials 4.4       Common Stocks 99.2 Short-Term Investments and Net Other Assets (Liabilities) 0.8 ASSET ALLOCATION (% of Fund's net assets) United States 89.9 Canada 6.0 Zambia 2.4 Brazil 1.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Linde PLC 19.1     Ecolab Inc 10.2     Dow Inc 6.9     Air Products and Chemicals Inc 5.4     Freeport-McMoRan Inc 5.0     Corteva Inc 3.9     Nucor Corp 3.9     Axalta Coating Systems Ltd 3.6     Chemours Co/The 3.3     First Quantum Minerals Ltd 2.4       63.7  
Fidelity Advisor Communication Services Fund - Class Z  
Shareholder Report [Line Items]  
Fund Name Communication Services Portfolio
Class Name Fidelity Advisor® Communication Services Fund Class Z
Trading Symbol FGKMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Communication Services Portfolio for the period March 1, 2024 to August 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
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
 
Class Z 
$ 30 
0.58%
  
Expenses Paid, Amount $ 30
Expense Ratio, Percent 0.58%
Net Assets $ 1,564,235,226
Holdings Count | shares 49
Investment Company Portfolio Turnover 39.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,564,235,226
 
  
Number of Holdings
49
 
  
Portfolio Turnover
39%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Interactive Media & Services 52.6   Entertainment 22.6   Media 8.0   Diversified Telecommunication Services 7.9   Broadline Retail 5.3   Ground Transportation 2.5   IT Services 0.0   Consumer Staples Distribution & Retail 0.0   Software 0.0       Common Stocks 98.9 Short-Term Investments and Net Other Assets (Liabilities) 1.1 ASSET ALLOCATION (% of Fund's net assets) United States 93.7 Puerto Rico 1.8 Belgium 1.3 Singapore 1.2 China 0.7 France 0.7 Japan 0.5 Canada 0.1 United Kingdom 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Meta Platforms Inc Class A 24.9     Alphabet Inc Class A 22.6     AT&T Inc 4.8     Walt Disney Co/The 4.6     Amazon.com Inc 4.6     Netflix Inc 4.6     Charter Communications Inc Class A 2.6     Uber Technologies Inc 2.5     Liberty Media Corp-Liberty Formula One Class A 2.3     Comcast Corp Class A 2.3       75.8  
Select Industrials Portfolio  
Shareholder Report [Line Items]  
Fund Name Industrials Portfolio
Class Name Industrials Portfolio
Trading Symbol FCYIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Industrials Portfolio for the period March 1, 2024 to August 31, 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
 
Industrials Portfolio 
$ 36 
0.69%
  
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.69%
Net Assets $ 591,125,639
Holdings Count | shares 51
Investment Company Portfolio Turnover 37.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$591,125,639
 
  
Number of Holdings
51
 
  
Portfolio Turnover
37%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Aerospace & Defense 22.7   Machinery 19.6   Ground Transportation 13.2   Electrical Equipment 12.8   Building Products 11.5   Trading Companies & Distributors 5.7   Construction & Engineering 3.8   Professional Services 3.4   Commercial Services & Supplies 3.2   Others 3.7       Common Stocks 99.6 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) United States 100.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     General Electric Co 6.4     Union Pacific Corp 5.1     Howmet Aerospace Inc 4.7     Parker-Hannifin Corp 4.3     Ingersoll Rand Inc 4.3     Trane Technologies PLC 4.1     TransDigm Group Inc 3.9     Boeing Co 3.8     GE Vernova Inc 3.4     Eaton Corp PLC 3.3       43.3  
Select Banking Portfolio  
Shareholder Report [Line Items]  
Fund Name Banking Portfolio
Class Name Banking Portfolio
Trading Symbol FSRBX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Banking Portfolio for the period March 1, 2024 to August 31, 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
 
Banking Portfolio 
$ 40 
0.71%
  
Expenses Paid, Amount $ 40
Expense Ratio, Percent 0.71%
Net Assets $ 439,247,104
Holdings Count | shares 37
Investment Company Portfolio Turnover 29.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$439,247,104
 
  
Number of Holdings
37
 
  
Portfolio Turnover
29%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Banks 97.6   Capital Markets 2.5   Financial Services 0.0   Consumer Finance 0.0       Common Stocks 100.1 ASSET ALLOCATION (% of Fund's net assets) Short-Term Investments and Net Other Assets (Liabilities) - (0.1)% United States 94.9 Puerto Rico 5.1 Cyprus 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Wells Fargo & Co 7.5     Bank of America Corp 6.8     M&T Bank Corp 6.2     Citigroup Inc 5.6     US Bancorp 5.4     PNC Financial Services Group Inc/The 5.3     Popular Inc 5.1     KeyCorp 4.0     Heartland Financial USA Inc 3.5     Huntington Bancshares Inc/OH 3.4       52.8  
Fidelity Advisor Telecommunications Fund - Class Z  
Shareholder Report [Line Items]  
Fund Name Telecommunications Portfolio
Class Name Fidelity Advisor® Telecommunications Fund Class Z
Trading Symbol FIJGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Telecommunications Portfolio for the period March 1, 2024 to August 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
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
 
Class Z 
$ 35 
0.65%
  
Expenses Paid, Amount $ 35
Expense Ratio, Percent 0.65%
Net Assets $ 196,158,282
Holdings Count | shares 27
Investment Company Portfolio Turnover 29.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$196,158,282
 
  
Number of Holdings
27
 
  
Portfolio Turnover
29%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Diversified Telecommunication Services 75.8   Wireless Telecommunication Services 12.7   Media 4.1   IT Services 0.6   Construction & Engineering 0.2       Common Stocks 93.4 Short-Term Investments and Net Other Assets (Liabilities) 6.6 ASSET ALLOCATION (% of Fund's net assets) United States 92.5 Puerto Rico 4.0 Belgium 3.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     AT&T Inc 23.3     Verizon Communications Inc 19.7     Lumen Technologies Inc 6.2     Cogent Communications Holdings Inc 4.9     T-Mobile US Inc 4.8     Iridium Communications Inc 4.8     Liberty Latin America Ltd Class C 4.0     Liberty Global Ltd Class C 3.5     Telephone and Data Systems Inc 3.4     Gogo Inc 2.9       77.5  
Fidelity Advisor Gold Fund - Class M  
Shareholder Report [Line Items]  
Fund Name Gold Portfolio
Class Name Fidelity Advisor® Gold Fund Class M
Trading Symbol FGDTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Gold Portfolio for the period March 1, 2024 to August 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
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
 
Class M 
$ 75 
1.22%
  
Expenses Paid, Amount $ 75
Expense Ratio, Percent 1.22%
Net Assets $ 1,501,574,716
Holdings Count | shares 65
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,501,574,716
 
  
Number of Holdings
65
 
  
Portfolio Turnover
13%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Metals & Mining* 98.4   Financial Services 0.0     *Includes gold bullion and/or silver bullion.   Common Stocks 98.4 Other Investments 0.9 Short-Term Investments and Net Other Assets (Liabilities) 0.7 ASSET ALLOCATION (% of Fund's net assets) Canada 60.3 United States 15.8 Brazil 10.3 Australia 6.3 United Kingdom 2.3 South Africa 1.9 China 1.5 Burkina Faso 1.3 Egypt 0.3 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Agnico Eagle Mines Ltd 14.8     Newmont Corp 11.6     Wheaton Precious Metals Corp 10.3     Franco-Nevada Corp 9.3     Barrick Gold Corp 4.9     Alamos Gold Inc Class A 4.1     Northern Star Resources Ltd 3.8     Osisko Gold Royalties Ltd 2.7     Anglogold Ashanti Plc 2.3     Lundin Gold Inc 2.3       66.1  
Select FinTech Portfolio  
Shareholder Report [Line Items]  
Fund Name FinTech Portfolio
Class Name FinTech Portfolio
Trading Symbol FSVLX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about FinTech Portfolio for the period March 1, 2024 to August 31, 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
 
FinTech Portfolio 
$ 39 
0.76%
  
Expenses Paid, Amount $ 39
Expense Ratio, Percent 0.76%
Net Assets $ 98,348,487
Holdings Count | shares 25
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$98,348,487
 
  
Number of Holdings
25
 
  
Portfolio Turnover
31%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Financial Services 61.9   Consumer Finance 20.9   Software 12.3   IT Services 4.8       Common Stocks 99.9 Short-Term Investments and Net Other Assets (Liabilities) 0.1 ASSET ALLOCATION (% of Fund's net assets) United States 89.5 Netherlands 4.8 Canada 4.8 Brazil 0.5 United Kingdom 0.4 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Mastercard Inc Class A 12.7     American Express Co 12.1     Visa Inc Class A 11.7     Intuit Inc 11.1     Discover Financial Services 4.9     Fidelity National Information Services Inc 4.9     Fiserv Inc 4.9     Adyen NV 4.8     Shopify Inc Class A (United States) 4.8     Corpay Inc 4.8       76.7  
Select Gold Portfolio  
Shareholder Report [Line Items]  
Fund Name Gold Portfolio
Class Name Gold Portfolio
Trading Symbol FSAGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Gold Portfolio for the period March 1, 2024 to August 31, 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
 
Gold Portfolio 
$ 42 
0.68%
  
Expenses Paid, Amount $ 42
Expense Ratio, Percent 0.68%
Net Assets $ 1,501,574,716
Holdings Count | shares 65
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,501,574,716
 
  
Number of Holdings
65
 
  
Portfolio Turnover
13%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Metals & Mining* 98.4   Financial Services 0.0     *Includes gold bullion and/or silver bullion.   Common Stocks 98.4 Other Investments 0.9 Short-Term Investments and Net Other Assets (Liabilities) 0.7 ASSET ALLOCATION (% of Fund's net assets) Canada 60.3 United States 15.8 Brazil 10.3 Australia 6.3 United Kingdom 2.3 South Africa 1.9 China 1.5 Burkina Faso 1.3 Egypt 0.3 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Agnico Eagle Mines Ltd 14.8     Newmont Corp 11.6     Wheaton Precious Metals Corp 10.3     Franco-Nevada Corp 9.3     Barrick Gold Corp 4.9     Alamos Gold Inc Class A 4.1     Northern Star Resources Ltd 3.8     Osisko Gold Royalties Ltd 2.7     Anglogold Ashanti Plc 2.3     Lundin Gold Inc 2.3       66.1  
Fidelity Advisor Materials Fund - Class I  
Shareholder Report [Line Items]  
Fund Name Materials Portfolio
Class Name Fidelity Advisor® Materials Fund Class I
Trading Symbol FMFEX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Materials Portfolio for the period March 1, 2024 to August 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
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
 
Class I 
$ 37 
0.72%
  
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.72%
Net Assets $ 849,835,612
Holdings Count | shares 39
Investment Company Portfolio Turnover 59.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$849,835,612
 
  
Number of Holdings
39
 
  
Portfolio Turnover
59%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Chemicals 61.6   Metals & Mining 25.3   Containers & Packaging 7.9   Construction Materials 4.4       Common Stocks 99.2 Short-Term Investments and Net Other Assets (Liabilities) 0.8 ASSET ALLOCATION (% of Fund's net assets) United States 89.9 Canada 6.0 Zambia 2.4 Brazil 1.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Linde PLC 19.1     Ecolab Inc 10.2     Dow Inc 6.9     Air Products and Chemicals Inc 5.4     Freeport-McMoRan Inc 5.0     Corteva Inc 3.9     Nucor Corp 3.9     Axalta Coating Systems Ltd 3.6     Chemours Co/The 3.3     First Quantum Minerals Ltd 2.4       63.7  
Select Communication Services Portfolio  
Shareholder Report [Line Items]  
Fund Name Communication Services Portfolio
Class Name Communication Services Portfolio
Trading Symbol FBMPX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Communication Services Portfolio for the period March 1, 2024 to August 31, 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
 
Communication Services Portfolio 
$ 35 
0.67%
  
Expenses Paid, Amount $ 35
Expense Ratio, Percent 0.67%
Net Assets $ 1,564,235,226
Holdings Count | shares 49
Investment Company Portfolio Turnover 39.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,564,235,226
 
  
Number of Holdings
49
 
  
Portfolio Turnover
39%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Interactive Media & Services 52.6   Entertainment 22.6   Media 8.0   Diversified Telecommunication Services 7.9   Broadline Retail 5.3   Ground Transportation 2.5   IT Services 0.0   Consumer Staples Distribution & Retail 0.0   Software 0.0       Common Stocks 98.9 Short-Term Investments and Net Other Assets (Liabilities) 1.1 ASSET ALLOCATION (% of Fund's net assets) United States 93.7 Puerto Rico 1.8 Belgium 1.3 Singapore 1.2 China 0.7 France 0.7 Japan 0.5 Canada 0.1 United Kingdom 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Meta Platforms Inc Class A 24.9     Alphabet Inc Class A 22.6     AT&T Inc 4.8     Walt Disney Co/The 4.6     Amazon.com Inc 4.6     Netflix Inc 4.6     Charter Communications Inc Class A 2.6     Uber Technologies Inc 2.5     Liberty Media Corp-Liberty Formula One Class A 2.3     Comcast Corp Class A 2.3       75.8  
Fidelity Advisor Materials Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Materials Portfolio
Class Name Fidelity Advisor® Materials Fund Class C
Trading Symbol FMFCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Materials Portfolio for the period March 1, 2024 to August 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
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
 
Class C 
$ 90 
1.74%
  
Expenses Paid, Amount $ 90
Expense Ratio, Percent 1.74%
Net Assets $ 849,835,612
Holdings Count | shares 39
Investment Company Portfolio Turnover 59.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$849,835,612
 
  
Number of Holdings
39
 
  
Portfolio Turnover
59%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Chemicals 61.6   Metals & Mining 25.3   Containers & Packaging 7.9   Construction Materials 4.4       Common Stocks 99.2 Short-Term Investments and Net Other Assets (Liabilities) 0.8 ASSET ALLOCATION (% of Fund's net assets) United States 89.9 Canada 6.0 Zambia 2.4 Brazil 1.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Linde PLC 19.1     Ecolab Inc 10.2     Dow Inc 6.9     Air Products and Chemicals Inc 5.4     Freeport-McMoRan Inc 5.0     Corteva Inc 3.9     Nucor Corp 3.9     Axalta Coating Systems Ltd 3.6     Chemours Co/The 3.3     First Quantum Minerals Ltd 2.4       63.7  
Select Biotechnology Portfolio  
Shareholder Report [Line Items]  
Fund Name Biotechnology Portfolio
Class Name Biotechnology Portfolio
Trading Symbol FBIOX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Biotechnology Portfolio for the period March 1, 2024 to August 31, 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
 
Biotechnology Portfolio 
$ 34 
0.64%
  
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.64%
Net Assets $ 5,008,216,225
Holdings Count | shares 200
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$5,008,216,225
 
  
Number of Holdings
200
 
  
Portfolio Turnover
31%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Biotechnology 92.2   Pharmaceuticals 7.1   Health Care Providers & Services 0.2   Health Care Technology 0.2   Life Sciences Tools & Services 0.1   Health Care Equipment & Supplies 0.0   Consumer Staples Distribution & Retail 0.0       Common Stocks 98.8 Preferred Stocks 1.0 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets) United States 88.7 Denmark 3.9 Netherlands 3.2 Belgium 2.0 United Kingdom 0.6 Switzerland 0.5 Canada 0.4 Ireland 0.4 France 0.3 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Abbvie Inc 11.0     Amgen Inc 9.7     Krystal Biotech Inc 7.4     Regeneron Pharmaceuticals Inc 5.3     Vertex Pharmaceuticals Inc 4.4     Alnylam Pharmaceuticals Inc 3.4     Gilead Sciences Inc 2.6     UCB SA 2.0     Zealand Pharma A/S 2.0     Ascendis Pharma A/S ADR 1.8       49.6  
Fidelity Environment and Alternative Energy Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® Environment and Alternative Energy Fund
Class Name Fidelity® Environment and Alternative Energy Fund
Trading Symbol FSLEX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Environment and Alternative Energy Fund for the period March 1, 2024 to August 31, 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® Environment and Alternative Energy Fund 
$ 37 
0.70%
  
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.70%
Net Assets $ 556,919,674
Holdings Count | shares 70
Investment Company Portfolio Turnover 36.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$556,919,674
 
  
Number of Holdings
70
 
  
Portfolio Turnover
36%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Software 10.8   Automobiles 9.4   Chemicals 9.1   Electrical Equipment 8.0   Semiconductors & Semiconductor Equipment 7.9   IT Services 6.8   Building Products 6.0   Commercial Services & Supplies 5.1   Ground Transportation 4.7   Others 32.1       Common Stocks 99.9 Preferred Stocks 0.0 Short-Term Investments and Net Other Assets (Liabilities) 0.1 ASSET ALLOCATION (% of Fund's net assets) United States 94.8 China 2.5 Japan 1.1 Denmark 0.8 Germany 0.5 Canada 0.3 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Microsoft Corp 10.8     Tesla Inc 8.8     Linde PLC 7.2     International Business Machines Corp 5.9     Union Pacific Corp 4.7     Prologis Inc 4.3     Eaton Corp PLC 3.8     Republic Services Inc 3.2     Trane Technologies PLC 3.1     Arista Networks Inc 2.8       54.6  
Select Automotive Portfolio  
Shareholder Report [Line Items]  
Fund Name Automotive Portfolio
Class Name Automotive Portfolio
Trading Symbol FSAVX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Automotive Portfolio for the period March 1, 2024 to August 31, 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
 
Automotive Portfolio 
$ 39 
0.81%
  
Expenses Paid, Amount $ 39
Expense Ratio, Percent 0.81%
Net Assets $ 75,054,295
Holdings Count | shares 34
Investment Company Portfolio Turnover 64.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$75,054,295
 
  
Number of Holdings
34
 
  
Portfolio Turnover
64%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Automobiles 53.6   Specialty Retail 21.1   Automobile Components 11.0   Commercial Services & Supplies 6.3   Distributors 4.5   Ground Transportation 1.9   Trading Companies & Distributors 0.7   Consumer Staples Distribution & Retail 0.3   Electronic Equipment, Instruments & Components 0.0       Common Stocks 99.4 Preferred Stocks 0.0 Short-Term Investments and Net Other Assets (Liabilities) 0.6 ASSET ALLOCATION (% of Fund's net assets) United States 70.9 Japan 13.4 Italy 8.1 China 4.8 Sweden 2.7 Luxembourg 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Tesla Inc 11.3     O'Reilly Automotive Inc 9.0     Toyota Motor Corp ADR 9.0     General Motors Co 8.2     Ferrari NV 8.1     Aptiv PLC 4.8     AutoZone Inc 4.6     Copart Inc 4.5     Honda Motor Co Ltd ADR 4.4     Li Auto Inc ADR 4.2       68.1  
Select Consumer Discretionary Portfolio  
Shareholder Report [Line Items]  
Fund Name Consumer Discretionary Portfolio
Class Name Consumer Discretionary Portfolio
Trading Symbol FSCPX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Consumer Discretionary Portfolio for the period March 1, 2024 to August 31, 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
 
Consumer Discretionary Portfolio 
$ 35 
0.70%
  
Expenses Paid, Amount $ 35
Expense Ratio, Percent 0.70%
Net Assets $ 471,659,584
Holdings Count | shares 60
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$471,659,584
 
  
Number of Holdings
60
 
  
Portfolio Turnover
23%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Broadline Retail 26.0   Specialty Retail 23.9   Hotels, Restaurants & Leisure 19.3   Automobiles 11.7   Textiles, Apparel & Luxury Goods 8.3   Household Durables 5.4   Automobile Components 2.7   Consumer Staples Distribution & Retail 1.0   Building Products 0.8   Others 0.6       Common Stocks 99.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) United States 95.8 Canada 2.1 Brazil 1.0 United Kingdom 0.4 France 0.4 Switzerland 0.3 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Amazon.com Inc 23.9     Tesla Inc 10.0     Home Depot Inc/The 4.8     Lowe's Cos Inc 4.7     TJX Cos Inc/The 3.7     Hilton Worldwide Holdings Inc 3.1     McDonald's Corp 2.6     Dick's Sporting Goods Inc 2.3     NIKE Inc Class B 2.3     Aptiv PLC 2.2       59.6  
Fidelity Advisor Gold Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Gold Portfolio
Class Name Fidelity Advisor® Gold Fund Class A
Trading Symbol FGDAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Gold Portfolio for the period March 1, 2024 to August 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
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
 
Class A 
$ 60 
0.97%
  
Expenses Paid, Amount $ 60
Expense Ratio, Percent 0.97%
Net Assets $ 1,501,574,716
Holdings Count | shares 65
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,501,574,716
 
  
Number of Holdings
65
 
  
Portfolio Turnover
13%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Metals & Mining* 98.4   Financial Services 0.0     *Includes gold bullion and/or silver bullion.   Common Stocks 98.4 Other Investments 0.9 Short-Term Investments and Net Other Assets (Liabilities) 0.7 ASSET ALLOCATION (% of Fund's net assets) Canada 60.3 United States 15.8 Brazil 10.3 Australia 6.3 United Kingdom 2.3 South Africa 1.9 China 1.5 Burkina Faso 1.3 Egypt 0.3 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Agnico Eagle Mines Ltd 14.8     Newmont Corp 11.6     Wheaton Precious Metals Corp 10.3     Franco-Nevada Corp 9.3     Barrick Gold Corp 4.9     Alamos Gold Inc Class A 4.1     Northern Star Resources Ltd 3.8     Osisko Gold Royalties Ltd 2.7     Anglogold Ashanti Plc 2.3     Lundin Gold Inc 2.3       66.1  
Select Semiconductors Portfolio  
Shareholder Report [Line Items]  
Fund Name Semiconductors Portfolio
Class Name Semiconductors Portfolio
Trading Symbol FSELX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Semiconductors Portfolio for the period March 1, 2024 to August 31, 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
 
Semiconductors Portfolio 
$ 34 
0.63%
  
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.63%
Net Assets $ 19,711,434,026
Holdings Count | shares 42
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$19,711,434,026
 
  
Number of Holdings
42
 
  
Portfolio Turnover
42%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Semiconductors & Semiconductor Equipment 94.3   Technology Hardware, Storage & Peripherals 2.8   Electronic Equipment, Instruments & Components 0.1   Financial Services 0.0   Metals & Mining 0.0   Software 0.0       Common Stocks 97.0 Preferred Stocks 0.2 Preferred Securities 0.0 Short-Term Investments and Net Other Assets (Liabilities) 2.8 ASSET ALLOCATION (% of Fund's net assets) United States 78.1 Taiwan 8.1 China 6.3 Netherlands 4.9 Israel 1.6 Japan 1.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     NVIDIA Corp 24.8     Taiwan Semiconductor Manufacturing Co Ltd ADR 7.7     ON Semiconductor Corp 7.2     NXP Semiconductors NV 6.3     Marvell Technology Inc 5.0     Broadcom Inc 4.9     ASML Holding NV depository receipt 4.9     Micron Technology Inc 4.9     GlobalFoundries Inc 4.8     Monolithic Power Systems Inc 4.3       74.8  
Select Brokerage and Investment Management Portfolio  
Shareholder Report [Line Items]  
Fund Name Brokerage and Investment Management Portfolio
Class Name Brokerage and Investment Management Portfolio
Trading Symbol FSLBX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Brokerage and Investment Management Portfolio for the period March 1, 2024 to August 31, 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
 
Brokerage and Investment Management Portfolio 
$ 37 
0.69%
  
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.69%
Net Assets $ 917,253,584
Holdings Count | shares 41
Investment Company Portfolio Turnover 21.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$917,253,584
 
  
Number of Holdings
41
 
  
Portfolio Turnover
21%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Capital Markets 95.8   Financial Services 3.9       Common Stocks 99.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) United States 97.0 United Kingdom 1.1 Luxembourg 0.7 Grand Cayman (UK Overseas Ter) 0.6 Canada 0.5 Sweden 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Moody's Corp 9.3     KKR & Co Inc Class A 6.4     S&P Global Inc 5.4     Blackstone Inc 5.2     Ares Management Corp Class A 5.1     Intercontinental Exchange Inc 5.1     Blue Owl Capital Inc Class A 5.0     BlackRock Inc 4.6     Ameriprise Financial Inc 4.4     Apollo Global Management Inc 3.9       54.4  
Select Chemicals Portfolio  
Shareholder Report [Line Items]  
Fund Name Chemicals Portfolio
Class Name Chemicals Portfolio
Trading Symbol FSCHX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Chemicals Portfolio for the period March 1, 2024 to August 31, 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
 
Chemicals Portfolio 
$ 36 
0.69%
  
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.69%
Net Assets $ 610,081,738
Holdings Count | shares 26
Investment Company Portfolio Turnover 2.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$610,081,738
 
  
Number of Holdings
26
 
  
Portfolio Turnover
2%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Chemicals 99.1       Common Stocks 99.1 Short-Term Investments and Net Other Assets (Liabilities) 0.9 ASSET ALLOCATION (% of Fund's net assets) United States 97.8 Germany 2.2 Argentina 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Linde PLC 23.4     Sherwin-Williams Co/The 11.3     Air Products and Chemicals Inc 8.9     Ecolab Inc 5.9     Axalta Coating Systems Ltd 4.9     Element Solutions Inc 4.5     DuPont de Nemours Inc 4.3     Corteva Inc 4.1     Celanese Corp 3.8     Westlake Corp 3.5       74.6  
Fidelity Advisor Communication Services Fund - Class I  
Shareholder Report [Line Items]  
Fund Name Communication Services Portfolio
Class Name Fidelity Advisor® Communication Services Fund Class I
Trading Symbol FGJMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Communication Services Portfolio for the period March 1, 2024 to August 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
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
 
Class I 
$ 37 
0.71%
  
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.71%
Net Assets $ 1,564,235,226
Holdings Count | shares 49
Investment Company Portfolio Turnover 39.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,564,235,226
 
  
Number of Holdings
49
 
  
Portfolio Turnover
39%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Interactive Media & Services 52.6   Entertainment 22.6   Media 8.0   Diversified Telecommunication Services 7.9   Broadline Retail 5.3   Ground Transportation 2.5   IT Services 0.0   Consumer Staples Distribution & Retail 0.0   Software 0.0       Common Stocks 98.9 Short-Term Investments and Net Other Assets (Liabilities) 1.1 ASSET ALLOCATION (% of Fund's net assets) United States 93.7 Puerto Rico 1.8 Belgium 1.3 Singapore 1.2 China 0.7 France 0.7 Japan 0.5 Canada 0.1 United Kingdom 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Meta Platforms Inc Class A 24.9     Alphabet Inc Class A 22.6     AT&T Inc 4.8     Walt Disney Co/The 4.6     Amazon.com Inc 4.6     Netflix Inc 4.6     Charter Communications Inc Class A 2.6     Uber Technologies Inc 2.5     Liberty Media Corp-Liberty Formula One Class A 2.3     Comcast Corp Class A 2.3       75.8  
Select Tech Hardware Portfolio  
Shareholder Report [Line Items]  
Fund Name Tech Hardware Portfolio
Class Name Tech Hardware Portfolio
Trading Symbol FDCPX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Tech Hardware Portfolio for the period March 1, 2024 to August 31, 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
 
Tech Hardware Portfolio 
$ 37 
0.69%
  
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.69%
Net Assets $ 1,022,851,445
Holdings Count | shares 34
Investment Company Portfolio Turnover 47.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,022,851,445
 
  
Number of Holdings
34
 
  
Portfolio Turnover
47%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Technology Hardware, Storage & Peripherals 38.5   Communications Equipment 28.7   Software 7.9   Electronic Equipment, Instruments & Components 7.5   Entertainment 4.9   Household Durables 4.6   Semiconductors & Semiconductor Equipment 4.5   Interactive Media & Services 1.2       Common Stocks 97.7 Preferred Stocks 0.1 Short-Term Investments and Net Other Assets (Liabilities) 2.2 ASSET ALLOCATION (% of Fund's net assets) United States 68.2 Japan 15.5 Korea (South) 12.0 Taiwan 3.3 China 1.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Cisco Systems Inc 12.9     Samsung Electronics Co Ltd 12.0     Apple Inc 11.0     Motorola Solutions Inc 6.9     Arista Networks Inc 6.7     Nintendo Co Ltd 4.9     Palo Alto Networks Inc 4.7     Sony Group Corp 4.6     CDW Corp/DE 4.5     FUJIFILM Holdings Corp 4.0       72.2  
Fidelity Advisor Gold Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Gold Portfolio
Class Name Fidelity Advisor® Gold Fund Class C
Trading Symbol FGDCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Gold Portfolio for the period March 1, 2024 to August 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
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
 
Class C 
$ 106 
1.72%
  
Expenses Paid, Amount $ 106
Expense Ratio, Percent 1.72%
Net Assets $ 1,501,574,716
Holdings Count | shares 65
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,501,574,716
 
  
Number of Holdings
65
 
  
Portfolio Turnover
13%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Metals & Mining* 98.4   Financial Services 0.0     *Includes gold bullion and/or silver bullion.   Common Stocks 98.4 Other Investments 0.9 Short-Term Investments and Net Other Assets (Liabilities) 0.7 ASSET ALLOCATION (% of Fund's net assets) Canada 60.3 United States 15.8 Brazil 10.3 Australia 6.3 United Kingdom 2.3 South Africa 1.9 China 1.5 Burkina Faso 1.3 Egypt 0.3 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Agnico Eagle Mines Ltd 14.8     Newmont Corp 11.6     Wheaton Precious Metals Corp 10.3     Franco-Nevada Corp 9.3     Barrick Gold Corp 4.9     Alamos Gold Inc Class A 4.1     Northern Star Resources Ltd 3.8     Osisko Gold Royalties Ltd 2.7     Anglogold Ashanti Plc 2.3     Lundin Gold Inc 2.3       66.1  
Fidelity Advisor Materials Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Materials Portfolio
Class Name Fidelity Advisor® Materials Fund Class A
Trading Symbol FMFAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Materials Portfolio for the period March 1, 2024 to August 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
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
 
Class A 
$ 51 
0.99%
  
Expenses Paid, Amount $ 51
Expense Ratio, Percent 0.99%
Net Assets $ 849,835,612
Holdings Count | shares 39
Investment Company Portfolio Turnover 59.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$849,835,612
 
  
Number of Holdings
39
 
  
Portfolio Turnover
59%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Chemicals 61.6   Metals & Mining 25.3   Containers & Packaging 7.9   Construction Materials 4.4       Common Stocks 99.2 Short-Term Investments and Net Other Assets (Liabilities) 0.8 ASSET ALLOCATION (% of Fund's net assets) United States 89.9 Canada 6.0 Zambia 2.4 Brazil 1.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Linde PLC 19.1     Ecolab Inc 10.2     Dow Inc 6.9     Air Products and Chemicals Inc 5.4     Freeport-McMoRan Inc 5.0     Corteva Inc 3.9     Nucor Corp 3.9     Axalta Coating Systems Ltd 3.6     Chemours Co/The 3.3     First Quantum Minerals Ltd 2.4       63.7  
Fidelity Advisor Telecommunications Fund - Class M  
Shareholder Report [Line Items]  
Fund Name Telecommunications Portfolio
Class Name Fidelity Advisor® Telecommunications Fund Class M
Trading Symbol FTUTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Telecommunications Portfolio for the period March 1, 2024 to August 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
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
 
Class M 
$ 71 
1.31%
  
Expenses Paid, Amount $ 71
Expense Ratio, Percent 1.31%
Net Assets $ 196,158,282
Holdings Count | shares 27
Investment Company Portfolio Turnover 29.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$196,158,282
 
  
Number of Holdings
27
 
  
Portfolio Turnover
29%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Diversified Telecommunication Services 75.8   Wireless Telecommunication Services 12.7   Media 4.1   IT Services 0.6   Construction & Engineering 0.2       Common Stocks 93.4 Short-Term Investments and Net Other Assets (Liabilities) 6.6 ASSET ALLOCATION (% of Fund's net assets) United States 92.5 Puerto Rico 4.0 Belgium 3.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     AT&T Inc 23.3     Verizon Communications Inc 19.7     Lumen Technologies Inc 6.2     Cogent Communications Holdings Inc 4.9     T-Mobile US Inc 4.8     Iridium Communications Inc 4.8     Liberty Latin America Ltd Class C 4.0     Liberty Global Ltd Class C 3.5     Telephone and Data Systems Inc 3.4     Gogo Inc 2.9       77.5  
Fidelity Advisor Telecommunications Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Telecommunications Portfolio
Class Name Fidelity Advisor® Telecommunications Fund Class A
Trading Symbol FTUAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Telecommunications Portfolio for the period March 1, 2024 to August 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
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
 
Class A 
$ 57 
1.06%
  
Expenses Paid, Amount $ 57
Expense Ratio, Percent 1.06%
Net Assets $ 196,158,282
Holdings Count | shares 27
Investment Company Portfolio Turnover 29.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$196,158,282
 
  
Number of Holdings
27
 
  
Portfolio Turnover
29%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Diversified Telecommunication Services 75.8   Wireless Telecommunication Services 12.7   Media 4.1   IT Services 0.6   Construction & Engineering 0.2       Common Stocks 93.4 Short-Term Investments and Net Other Assets (Liabilities) 6.6 ASSET ALLOCATION (% of Fund's net assets) United States 92.5 Puerto Rico 4.0 Belgium 3.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     AT&T Inc 23.3     Verizon Communications Inc 19.7     Lumen Technologies Inc 6.2     Cogent Communications Holdings Inc 4.9     T-Mobile US Inc 4.8     Iridium Communications Inc 4.8     Liberty Latin America Ltd Class C 4.0     Liberty Global Ltd Class C 3.5     Telephone and Data Systems Inc 3.4     Gogo Inc 2.9       77.5  
Fidelity Advisor Communication Services Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Communication Services Portfolio
Class Name Fidelity Advisor® Communication Services Fund Class A
Trading Symbol FGDMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Communication Services Portfolio for the period March 1, 2024 to August 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
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
 
Class A 
$ 50 
0.96%
  
Expenses Paid, Amount $ 50
Expense Ratio, Percent 0.96%
Net Assets $ 1,564,235,226
Holdings Count | shares 49
Investment Company Portfolio Turnover 39.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,564,235,226
 
  
Number of Holdings
49
 
  
Portfolio Turnover
39%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Interactive Media & Services 52.6   Entertainment 22.6   Media 8.0   Diversified Telecommunication Services 7.9   Broadline Retail 5.3   Ground Transportation 2.5   IT Services 0.0   Consumer Staples Distribution & Retail 0.0   Software 0.0       Common Stocks 98.9 Short-Term Investments and Net Other Assets (Liabilities) 1.1 ASSET ALLOCATION (% of Fund's net assets) United States 93.7 Puerto Rico 1.8 Belgium 1.3 Singapore 1.2 China 0.7 France 0.7 Japan 0.5 Canada 0.1 United Kingdom 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Meta Platforms Inc Class A 24.9     Alphabet Inc Class A 22.6     AT&T Inc 4.8     Walt Disney Co/The 4.6     Amazon.com Inc 4.6     Netflix Inc 4.6     Charter Communications Inc Class A 2.6     Uber Technologies Inc 2.5     Liberty Media Corp-Liberty Formula One Class A 2.3     Comcast Corp Class A 2.3       75.8  
Select Pharmaceuticals Portfolio  
Shareholder Report [Line Items]  
Fund Name Pharmaceuticals Portfolio
Class Name Pharmaceuticals Portfolio
Trading Symbol FPHAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Pharmaceuticals Portfolio for the period March 1, 2024 to August 31, 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
 
Pharmaceuticals Portfolio 
$ 37 
0.68%
  
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.68%
Net Assets $ 1,914,838,050
Holdings Count | shares 73
Investment Company Portfolio Turnover 14.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,914,838,050
 
  
Number of Holdings
73
 
  
Portfolio Turnover
14%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Pharmaceuticals 74.0   Biotechnology 20.4   Life Sciences Tools & Services 1.0   Health Care Equipment & Supplies 0.8   Health Care Providers & Services 0.2   Financial Services 0.1   Software 0.1   Consumer Staples Distribution & Retail 0.0       Common Stocks 96.2 Preferred Stocks 0.4 Bonds 0.0 Short-Term Investments and Net Other Assets (Liabilities) 3.4 ASSET ALLOCATION (% of Fund's net assets) United States 66.8 Denmark 13.6 United Kingdom 8.8 Belgium 5.9 Germany 3.2 Switzerland 0.6 Netherlands 0.6 Canada 0.5 Ireland 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Eli Lilly & Co 24.0     Novo Nordisk A/S Class B ADR 13.3     Astrazeneca PLC ADR 8.8     Bristol-Myers Squibb Co 5.1     UCB SA 4.7     GSK PLC ADR 4.5     Merck & Co Inc 4.2     Gilead Sciences Inc 3.2     Legend Biotech Corp ADR 2.5     Dyne Therapeutics Inc 2.2       72.5  
Select Consumer Staples Portfolio  
Shareholder Report [Line Items]  
Fund Name Consumer Staples Portfolio
Class Name Consumer Staples Portfolio
Trading Symbol FDFAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Consumer Staples Portfolio for the period March 1, 2024 to August 31, 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
 
Consumer Staples Portfolio 
$ 36 
0.68%
  
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.68%
Net Assets $ 1,405,206,341
Holdings Count | shares 39
Investment Company Portfolio Turnover 39.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,405,206,341
 
  
Number of Holdings
39
 
  
Portfolio Turnover
39%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Beverages 39.6   Household Products 18.8   Food Products 14.3   Consumer Staples Distribution & Retail 10.8   Personal Care Products 9.7   Tobacco 6.4   Oil, Gas & Consumable Fuels 0.1       Common Stocks 99.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) United States 95.1 United Kingdom 4.8 Canada 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Coca-Cola Co/The 14.2     Procter & Gamble Co/The 14.2     Keurig Dr Pepper Inc 9.8     Kenvue Inc 6.3     Walmart Inc 5.5     Philip Morris International Inc 4.2     Monster Beverage Corp 3.9     Energizer Holdings Inc 3.8     PepsiCo Inc 3.6     Estee Lauder Cos Inc/The Class A 3.4       68.9  
Select Medical Technology and Devices Portfolio  
Shareholder Report [Line Items]  
Fund Name Medical Technology and Devices Portfolio
Class Name Medical Technology and Devices Portfolio
Trading Symbol FSMEX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Medical Technology and Devices Portfolio for the period March 1, 2024 to August 31, 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
 
Medical Technology and Devices Portfolio 
$ 32 
0.63%
  
Expenses Paid, Amount $ 32
Expense Ratio, Percent 0.63%
Net Assets $ 5,352,945,554
Holdings Count | shares 64
Investment Company Portfolio Turnover 34.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$5,352,945,554
 
  
Number of Holdings
64
 
  
Portfolio Turnover
34%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Health Care Equipment & Supplies 55.0   Life Sciences Tools & Services 32.6   Health Care Technology 5.3   Biotechnology 3.5   Health Care Providers & Services 1.8   Textiles, Apparel & Luxury Goods 0.4   Financial Services 0.3   Pharmaceuticals 0.1       Common Stocks 96.6 Preferred Stocks 2.4 Preferred Securities 0.3 Bonds 0.0 Short-Term Investments and Net Other Assets (Liabilities) 0.7 ASSET ALLOCATION (% of Fund's net assets) United States 98.5 France 0.7 Canada 0.5 Japan 0.3 China 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Boston Scientific Corp 13.1     Danaher Corp 12.7     Thermo Fisher Scientific Inc 9.4     Intuitive Surgical Inc 8.4     Stryker Corp 6.7     Abbott Laboratories 4.8     Penumbra Inc 4.6     Insulet Corp 4.2     Veeva Systems Inc Class A 3.1     IQVIA Holdings Inc 3.1       70.1  
Fidelity Advisor Telecommunications Fund - Class I  
Shareholder Report [Line Items]  
Fund Name Telecommunications Portfolio
Class Name Fidelity Advisor® Telecommunications Fund Class I
Trading Symbol FTUIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Telecommunications Portfolio for the period March 1, 2024 to August 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
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
 
Class I 
$ 41 
0.76%
  
Expenses Paid, Amount $ 41
Expense Ratio, Percent 0.76%
Net Assets $ 196,158,282
Holdings Count | shares 27
Investment Company Portfolio Turnover 29.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$196,158,282
 
  
Number of Holdings
27
 
  
Portfolio Turnover
29%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Diversified Telecommunication Services 75.8   Wireless Telecommunication Services 12.7   Media 4.1   IT Services 0.6   Construction & Engineering 0.2       Common Stocks 93.4 Short-Term Investments and Net Other Assets (Liabilities) 6.6 ASSET ALLOCATION (% of Fund's net assets) United States 92.5 Puerto Rico 4.0 Belgium 3.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     AT&T Inc 23.3     Verizon Communications Inc 19.7     Lumen Technologies Inc 6.2     Cogent Communications Holdings Inc 4.9     T-Mobile US Inc 4.8     Iridium Communications Inc 4.8     Liberty Latin America Ltd Class C 4.0     Liberty Global Ltd Class C 3.5     Telephone and Data Systems Inc 3.4     Gogo Inc 2.9       77.5  
Select Enterprise Technology Services Portfolio  
Shareholder Report [Line Items]  
Fund Name Enterprise Technology Services Portfolio
Class Name Enterprise Technology Services Portfolio
Trading Symbol FBSOX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Enterprise Technology Services Portfolio for the period March 1, 2024 to August 31, 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
 
Enterprise Technology Services Portfolio 
$ 33 
0.66%
  
Expenses Paid, Amount $ 33
Expense Ratio, Percent 0.66%
Net Assets $ 1,702,201,601
Holdings Count | shares 34
Investment Company Portfolio Turnover 65.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,702,201,601
 
  
Number of Holdings
34
 
  
Portfolio Turnover
65%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Financial Services 59.5   IT Services 24.0   Professional Services 8.2   Software 4.7   Broadline Retail 1.8   Interactive Media & Services 1.6       Common Stocks 99.8 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets) United States 90.8 Ireland 7.4 Germany 1.8 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Visa Inc Class A 21.6     Mastercard Inc Class A 20.4     Accenture PLC Class A 7.4     Fiserv Inc 4.9     International Business Machines Corp 3.9     Automatic Data Processing Inc 3.7     Fidelity National Information Services Inc 3.7     Gartner Inc 3.6     Block Inc Class A 3.4     Corpay Inc 3.2       75.8  
Select Wireless Portfolio  
Shareholder Report [Line Items]  
Fund Name Wireless Portfolio
Class Name Wireless Portfolio
Trading Symbol FWRLX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Wireless Portfolio for the period March 1, 2024 to August 31, 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
 
Wireless Portfolio 
$ 39 
0.73%
  
Expenses Paid, Amount $ 39
Expense Ratio, Percent 0.73%
Net Assets $ 339,625,936
Holdings Count | shares 41
Investment Company Portfolio Turnover 38.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$339,625,936
 
  
Number of Holdings
41
 
  
Portfolio Turnover
38%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Technology Hardware, Storage & Peripherals 22.0   Diversified Telecommunication Services 18.4   Semiconductors & Semiconductor Equipment 18.2   Wireless Telecommunication Services 10.6   Specialized REITs 10.6   Communications Equipment 6.2   Interactive Media & Services 4.6   Broadline Retail 2.9   Entertainment 2.8   Others 2.8       Common Stocks 99.1 Short-Term Investments and Net Other Assets (Liabilities) 0.9 ASSET ALLOCATION (% of Fund's net assets) United States 83.7 Canada 2.7 Korea (South) 2.3 China 2.0 Belgium 2.0 Spain 1.9 Singapore 1.6 India 1.3 Finland 1.1 Others 1.4 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Apple Inc 19.7     AT&T Inc 10.9     American Tower Corp 8.7     Marvell Technology Inc 7.4     QUALCOMM Inc 4.8     Motorola Solutions Inc 4.8     T-Mobile US Inc 4.6     United States Cellular Corp 3.0     Amazon.com Inc 2.9     Spotify Technology SA 2.8       69.6  
Fidelity Advisor Telecommunications Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Telecommunications Portfolio
Class Name Fidelity Advisor® Telecommunications Fund Class C
Trading Symbol FTUCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Telecommunications Portfolio for the period March 1, 2024 to August 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
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
 
Class C 
$ 98 
1.81%
  
Expenses Paid, Amount $ 98
Expense Ratio, Percent 1.81%
Net Assets $ 196,158,282
Holdings Count | shares 27
Investment Company Portfolio Turnover 29.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$196,158,282
 
  
Number of Holdings
27
 
  
Portfolio Turnover
29%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Diversified Telecommunication Services 75.8   Wireless Telecommunication Services 12.7   Media 4.1   IT Services 0.6   Construction & Engineering 0.2       Common Stocks 93.4 Short-Term Investments and Net Other Assets (Liabilities) 6.6 ASSET ALLOCATION (% of Fund's net assets) United States 92.5 Puerto Rico 4.0 Belgium 3.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     AT&T Inc 23.3     Verizon Communications Inc 19.7     Lumen Technologies Inc 6.2     Cogent Communications Holdings Inc 4.9     T-Mobile US Inc 4.8     Iridium Communications Inc 4.8     Liberty Latin America Ltd Class C 4.0     Liberty Global Ltd Class C 3.5     Telephone and Data Systems Inc 3.4     Gogo Inc 2.9       77.5  
Select Leisure Portfolio  
Shareholder Report [Line Items]  
Fund Name Leisure Portfolio
Class Name Leisure Portfolio
Trading Symbol FDLSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Leisure Portfolio for the period March 1, 2024 to August 31, 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
 
Leisure Portfolio 
$ 35 
0.69%
  
Expenses Paid, Amount $ 35
Expense Ratio, Percent 0.69%
Net Assets $ 630,585,620
Holdings Count | shares 40
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$630,585,620
 
  
Number of Holdings
40
 
  
Portfolio Turnover
42%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Hotels, Restaurants & Leisure 94.8   Consumer Staples Distribution & Retail 1.4   Diversified Consumer Services 1.2   Leisure Products 1.1   Entertainment 0.6   Food Products 0.5   Financial Services 0.2       Common Stocks 99.8 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets) United States 95.2 Canada 2.8 United Kingdom 2.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     McDonald's Corp 16.2     Booking Holdings Inc 10.9     Starbucks Corp 8.9     Hilton Worldwide Holdings Inc 8.1     Marriott International Inc/MD Class A1 5.8     Chipotle Mexican Grill Inc 4.8     Airbnb Inc Class A 4.8     Royal Caribbean Cruises Ltd 4.3     Yum! Brands Inc 3.8     Restaurant Brands International Inc 2.8       70.4  
Fidelity Advisor Consumer Staples Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Consumer Staples Portfolio
Class Name Fidelity Advisor® Consumer Staples Fund Class A
Trading Symbol FDAGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Consumer Staples Portfolio for the period March 1, 2024 to August 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
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
 
Class A 
$ 51 
0.97%
  
Expenses Paid, Amount $ 51
Expense Ratio, Percent 0.97%
Net Assets $ 1,405,206,341
Holdings Count | shares 39
Investment Company Portfolio Turnover 39.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,405,206,341
 
  
Number of Holdings
39
 
  
Portfolio Turnover
39%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Beverages 39.6   Household Products 18.8   Food Products 14.3   Consumer Staples Distribution & Retail 10.8   Personal Care Products 9.7   Tobacco 6.4   Oil, Gas & Consumable Fuels 0.1       Common Stocks 99.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) United States 95.1 United Kingdom 4.8 Canada 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Coca-Cola Co/The 14.2     Procter & Gamble Co/The 14.2     Keurig Dr Pepper Inc 9.8     Kenvue Inc 6.3     Walmart Inc 5.5     Philip Morris International Inc 4.2     Monster Beverage Corp 3.9     Energizer Holdings Inc 3.8     PepsiCo Inc 3.6     Estee Lauder Cos Inc/The Class A 3.4       68.9  
Fidelity Advisor Communication Services Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Communication Services Portfolio
Class Name Fidelity Advisor® Communication Services Fund Class C
Trading Symbol FGHMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Communication Services Portfolio for the period March 1, 2024 to August 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
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
 
Class C 
$ 90 
1.71%
  
Expenses Paid, Amount $ 90
Expense Ratio, Percent 1.71%
Net Assets $ 1,564,235,226
Holdings Count | shares 49
Investment Company Portfolio Turnover 39.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,564,235,226
 
  
Number of Holdings
49
 
  
Portfolio Turnover
39%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Interactive Media & Services 52.6   Entertainment 22.6   Media 8.0   Diversified Telecommunication Services 7.9   Broadline Retail 5.3   Ground Transportation 2.5   IT Services 0.0   Consumer Staples Distribution & Retail 0.0   Software 0.0       Common Stocks 98.9 Short-Term Investments and Net Other Assets (Liabilities) 1.1 ASSET ALLOCATION (% of Fund's net assets) United States 93.7 Puerto Rico 1.8 Belgium 1.3 Singapore 1.2 China 0.7 France 0.7 Japan 0.5 Canada 0.1 United Kingdom 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Meta Platforms Inc Class A 24.9     Alphabet Inc Class A 22.6     AT&T Inc 4.8     Walt Disney Co/The 4.6     Amazon.com Inc 4.6     Netflix Inc 4.6     Charter Communications Inc Class A 2.6     Uber Technologies Inc 2.5     Liberty Media Corp-Liberty Formula One Class A 2.3     Comcast Corp Class A 2.3       75.8  
Select Defense and Aerospace Portfolio  
Shareholder Report [Line Items]  
Fund Name Defense and Aerospace Portfolio
Class Name Defense and Aerospace Portfolio
Trading Symbol FSDAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Defense and Aerospace Portfolio for the period March 1, 2024 to August 31, 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
 
Defense and Aerospace Portfolio 
$ 36 
0.66%
  
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.66%
Net Assets $ 1,763,712,595
Holdings Count | shares 31
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,763,712,595
 
  
Number of Holdings
31
 
  
Portfolio Turnover
42%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Aerospace & Defense 96.0   Metals & Mining 1.8   Professional Services 0.8   Trading Companies & Distributors 0.5       Common Stocks 99.1 Short-Term Investments and Net Other Assets (Liabilities) 0.9 ASSET ALLOCATION (% of Fund's net assets) United States 95.3 United Kingdom 2.2 Canada 1.0 Germany 0.8 France 0.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     General Electric Co 16.0     Boeing Co 10.1     RTX Corp 9.8     Lockheed Martin Corp 8.5     General Dynamics Corp 5.7     HEICO Corp Class A 4.9     Howmet Aerospace Inc 4.9     TransDigm Group Inc 4.7     Northrop Grumman Corp 4.5     Axon Enterprise Inc 3.8       72.9  
Select Transportation Portfolio  
Shareholder Report [Line Items]  
Fund Name Transportation Portfolio
Class Name Transportation Portfolio
Trading Symbol FSRFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Transportation Portfolio for the period March 1, 2024 to August 31, 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
 
Transportation Portfolio 
$ 35 
0.69%
  
Expenses Paid, Amount $ 35
Expense Ratio, Percent 0.69%
Net Assets $ 541,061,408
Holdings Count | shares 40
Investment Company Portfolio Turnover 24.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$541,061,408
 
  
Number of Holdings
40
 
  
Portfolio Turnover
24%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Ground Transportation 53.8   Air Freight & Logistics 20.7   Passenger Airlines 14.2   Marine Transportation 6.9   Oil, Gas & Consumable Fuels 1.5   Energy Equipment & Services 0.7       Common Stocks 97.8 Short-Term Investments and Net Other Assets (Liabilities) 2.2 ASSET ALLOCATION (% of Fund's net assets) United States 93.8 Panama 2.1 Greece 1.6 Canada 0.8 Italy 0.7 Brazil 0.7 Monaco 0.3 Bermuda 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Union Pacific Corp 18.5     Uber Technologies Inc 15.3     United Parcel Service Inc Class B 10.9     Norfolk Southern Corp 5.3     CSX Corp 4.9     FedEx Corp 4.9     Kirby Corp 4.3     Delta Air Lines Inc 3.9     Alaska Air Group Inc 2.6     SkyWest Inc 2.5       73.1  
Select Health Care Services Portfolio  
Shareholder Report [Line Items]  
Fund Name Health Care Services Portfolio
Class Name Health Care Services Portfolio
Trading Symbol FSHCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Health Care Services Portfolio for the period March 1, 2024 to August 31, 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
 
Health Care Services Portfolio 
$ 34 
0.67%
  
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.67%
Net Assets $ 1,395,684,497
Holdings Count | shares 30
Investment Company Portfolio Turnover 66.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,395,684,497
 
  
Number of Holdings
30
 
  
Portfolio Turnover
66%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Health Care Providers & Services 99.6   Health Care Technology 0.4       Common Stocks 99.6 Preferred Stocks 0.4 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) United States 100.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     UnitedHealth Group Inc 24.7     Cigna Group/The 9.4     CVS Health Corp 8.3     McKesson Corp 5.4     Humana Inc 4.4     Elevance Health Inc 4.4     Cencora Inc 4.4     Molina Healthcare Inc 3.7     Centene Corp 3.5     HCA Healthcare Inc 3.3       71.5  
Select Materials Portfolio  
Shareholder Report [Line Items]  
Fund Name Materials Portfolio
Class Name Materials Portfolio
Trading Symbol FSDPX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Materials Portfolio for the period March 1, 2024 to August 31, 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
 
Materials Portfolio 
$ 36 
0.70%
  
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.70%
Net Assets $ 849,835,612
Holdings Count | shares 39
Investment Company Portfolio Turnover 59.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$849,835,612
 
  
Number of Holdings
39
 
  
Portfolio Turnover
59%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Chemicals 61.6   Metals & Mining 25.3   Containers & Packaging 7.9   Construction Materials 4.4       Common Stocks 99.2 Short-Term Investments and Net Other Assets (Liabilities) 0.8 ASSET ALLOCATION (% of Fund's net assets) United States 89.9 Canada 6.0 Zambia 2.4 Brazil 1.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Linde PLC 19.1     Ecolab Inc 10.2     Dow Inc 6.9     Air Products and Chemicals Inc 5.4     Freeport-McMoRan Inc 5.0     Corteva Inc 3.9     Nucor Corp 3.9     Axalta Coating Systems Ltd 3.6     Chemours Co/The 3.3     First Quantum Minerals Ltd 2.4       63.7  
Select Insurance Portfolio  
Shareholder Report [Line Items]  
Fund Name Insurance Portfolio
Class Name Insurance Portfolio
Trading Symbol FSPCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Insurance Portfolio for the period March 1, 2024 to August 31, 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
 
Insurance Portfolio 
$ 38 
0.70%
  
Expenses Paid, Amount $ 38
Expense Ratio, Percent 0.70%
Net Assets $ 847,602,456
Holdings Count | shares 24
Investment Company Portfolio Turnover 46.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$847,602,456
 
  
Number of Holdings
24
 
  
Portfolio Turnover
46%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Insurance 92.9   Financial Services 4.9       Common Stocks 97.8 Short-Term Investments and Net Other Assets (Liabilities) 2.2 ASSET ALLOCATION (% of Fund's net assets) United States 98.0 Australia 2.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Chubb Ltd 9.9     Marsh & McLennan Cos Inc 9.7     Arthur J Gallagher & Co 9.2     Hartford Financial Services Group Inc/The 8.8     Travelers Cos Inc/The 7.7     Progressive Corp/The 4.8     Reinsurance Group of America Inc 4.8     MetLife Inc 4.7     Arch Capital Group Ltd 4.7     Brown & Brown Inc 4.6       68.9  
Select Health Care Portfolio  
Shareholder Report [Line Items]  
Fund Name Health Care Portfolio
Class Name Health Care Portfolio
Trading Symbol FSPHX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Health Care Portfolio for the period March 1, 2024 to August 31, 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
 
Health Care Portfolio 
$ 33 
0.63%
  
Expenses Paid, Amount $ 33
Expense Ratio, Percent 0.63%
Net Assets $ 7,810,818,412
Holdings Count | shares 105
Investment Company Portfolio Turnover 35.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$7,810,818,412
 
  
Number of Holdings
105
 
  
Portfolio Turnover
35%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Health Care Equipment & Supplies 24.3   Biotechnology 23.5   Health Care Providers & Services 22.5   Pharmaceuticals 16.6   Life Sciences Tools & Services 10.5   Health Care Technology 2.1   Financial Services 0.1       Common Stocks 98.1 Preferred Stocks 1.5 Preferred Securities 0.2 Bonds 0.1 Short-Term Investments and Net Other Assets (Liabilities) 0.1 ASSET ALLOCATION (% of Fund's net assets) United States 91.9 Netherlands 2.7 United Kingdom 1.7 Denmark 1.5 Belgium 1.4 Canada 0.7 Israel 0.1 China 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     UnitedHealth Group Inc 10.8     Boston Scientific Corp 9.4     Eli Lilly & Co 8.4     Danaher Corp 5.9     Regeneron Pharmaceuticals Inc 4.2     Merck & Co Inc 3.8     Penumbra Inc 3.5     Cigna Group/The 3.2     Stryker Corp 2.6     Insulet Corp 2.5       54.3  
Select Construction and Housing Portfolio  
Shareholder Report [Line Items]  
Fund Name Construction and Housing Portfolio
Class Name Construction and Housing Portfolio
Trading Symbol FSHOX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Construction and Housing Portfolio for the period March 1, 2024 to August 31, 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
 
Construction and Housing Portfolio 
$ 36 
0.69%
  
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.69%
Net Assets $ 815,270,742
Holdings Count | shares 52
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$815,270,742
 
  
Number of Holdings
52
 
  
Portfolio Turnover
31%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Specialty Retail 33.3   Building Products 22.3   Household Durables 14.4   Residential REITs 10.8   Construction & Engineering 9.0   Construction Materials 8.7   Trading Companies & Distributors 0.4   Chemicals 0.3   Real Estate Management & Development 0.2   Ground Transportation 0.2       Common Stocks 99.6 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) United States 100.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Home Depot Inc/The 17.2     Lowe's Cos Inc 13.2     Trane Technologies PLC 4.9     Johnson Controls International plc 4.6     CRH PLC 3.9     Martin Marietta Materials Inc 3.1     PulteGroup Inc 2.9     Invitation Homes Inc 2.9     Quanta Services Inc 2.7     Carrier Global Corp 2.6       58.0  
Select Financials Portfolio  
Shareholder Report [Line Items]  
Fund Name Financials Portfolio
Class Name Financials Portfolio
Trading Symbol FIDSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Financials Portfolio for the period March 1, 2024 to August 31, 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
 
Financials Portfolio 
$ 38 
0.70%
  
Expenses Paid, Amount $ 38
Expense Ratio, Percent 0.70%
Net Assets $ 783,287,308
Holdings Count | shares 65
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$783,287,308
 
  
Number of Holdings
65
 
  
Portfolio Turnover
31%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Banks 34.5   Financial Services 21.0   Capital Markets 20.5   Insurance 18.8   Consumer Finance 3.9   Professional Services 1.0       Common Stocks 99.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) United States 93.2 United Kingdom 4.0 Puerto Rico 1.8 Grand Cayman (UK Overseas Ter) 0.6 Mexico 0.4 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Mastercard Inc Class A 10.0     Wells Fargo & Co 6.5     Bank of America Corp 5.3     Citigroup Inc 2.9     Morgan Stanley 2.5     M&T Bank Corp 2.4     Apollo Global Management Inc 2.3     Chubb Ltd 2.3     Reinsurance Group of America Inc 2.2     Marsh & McLennan Cos Inc 2.1       38.5  
Select Energy Portfolio  
Shareholder Report [Line Items]  
Fund Name Energy Portfolio
Class Name Energy Portfolio
Trading Symbol FSENX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Energy Portfolio for the period March 1, 2024 to August 31, 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
 
Energy Portfolio 
$ 34 
0.66%
  
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.66%
Net Assets $ 2,159,619,676
Holdings Count | shares 45
Investment Company Portfolio Turnover 19.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$2,159,619,676
 
  
Number of Holdings
45
 
  
Portfolio Turnover
19%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Oil, Gas & Consumable Fuels 80.6   Energy Equipment & Services 15.5   Independent Power and Renewable Electricity Producers 1.7   Machinery 0.8       Common Stocks 98.6 Short-Term Investments and Net Other Assets (Liabilities) 1.4 ASSET ALLOCATION (% of Fund's net assets) United States 82.8 Canada 13.5 United Kingdom 3.1 Norway 0.3 France 0.1 Cameroon 0.1 United Arab Emirates 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Exxon Mobil Corp 24.9     Cenovus Energy Inc 5.9     Schlumberger NV 5.0     Chevron Corp 5.0     Marathon Petroleum Corp 4.9     Canadian Natural Resources Ltd 4.8     Cheniere Energy Inc 4.4     Occidental Petroleum Corp 3.6     Valero Energy Corp 3.6     Diamondback Energy Inc 3.3       65.4  
Select Retailing Portfolio  
Shareholder Report [Line Items]  
Fund Name Retailing Portfolio
Class Name Retailing Portfolio
Trading Symbol FSRPX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Retailing Portfolio for the period March 1, 2024 to August 31, 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
 
Retailing Portfolio 
$ 33 
0.64%
  
Expenses Paid, Amount $ 33
Expense Ratio, Percent 0.64%
Net Assets $ 2,883,461,931
Holdings Count | shares 45
Investment Company Portfolio Turnover 29.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$2,883,461,931
 
  
Number of Holdings
45
 
  
Portfolio Turnover
29%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Specialty Retail 36.6   Broadline Retail 30.0   Consumer Staples Distribution & Retail 17.7   Textiles, Apparel & Luxury Goods 12.5   Interactive Media & Services 1.3   Household Durables 0.9   Hotels, Restaurants & Leisure 0.5   Automobile Components 0.3       Common Stocks 99.8 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets) United States 91.0 Canada 4.6 Brazil 1.6 France 1.0 United Kingdom 1.0 Germany 0.8 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Amazon.com Inc 25.3     Home Depot Inc/The 7.5     Walmart Inc 6.9     Lowe's Cos Inc 6.6     TJX Cos Inc/The 4.7     NIKE Inc Class B 4.2     O'Reilly Automotive Inc 3.7     Costco Wholesale Corp 2.8     Deckers Outdoor Corp 2.7     BJ's Wholesale Club Holdings Inc 2.6       67.0  
Fidelity Advisor Consumer Staples Fund - Class I  
Shareholder Report [Line Items]  
Fund Name Consumer Staples Portfolio
Class Name Fidelity Advisor® Consumer Staples Fund Class I
Trading Symbol FDIGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Consumer Staples Portfolio for the period March 1, 2024 to August 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
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
 
Class I 
$ 37 
0.71%
  
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.71%
Net Assets $ 1,405,206,341
Holdings Count | shares 39
Investment Company Portfolio Turnover 39.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,405,206,341
 
  
Number of Holdings
39
 
  
Portfolio Turnover
39%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Beverages 39.6   Household Products 18.8   Food Products 14.3   Consumer Staples Distribution & Retail 10.8   Personal Care Products 9.7   Tobacco 6.4   Oil, Gas & Consumable Fuels 0.1       Common Stocks 99.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) United States 95.1 United Kingdom 4.8 Canada 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Coca-Cola Co/The 14.2     Procter & Gamble Co/The 14.2     Keurig Dr Pepper Inc 9.8     Kenvue Inc 6.3     Walmart Inc 5.5     Philip Morris International Inc 4.2     Monster Beverage Corp 3.9     Energizer Holdings Inc 3.8     PepsiCo Inc 3.6     Estee Lauder Cos Inc/The Class A 3.4       68.9  
Select Technology Portfolio  
Shareholder Report [Line Items]  
Fund Name Technology Portfolio
Class Name Technology Portfolio
Trading Symbol FSPTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Technology Portfolio for the period March 1, 2024 to August 31, 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
 
Technology Portfolio 
$ 33 
0.62%
  
Expenses Paid, Amount $ 33
Expense Ratio, Percent 0.62%
Net Assets $ 15,833,587,650
Holdings Count | shares 92
Investment Company Portfolio Turnover 43.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$15,833,587,650
 
  
Number of Holdings
92
 
  
Portfolio Turnover
43%
 
  
Holdings [Text Block]   TOP INDUSTRIES (% of Fund's net assets) Semiconductors & Semiconductor Equipment 42.0   Software 21.1   Technology Hardware, Storage & Peripherals 20.4   IT Services 4.0   Communications Equipment 2.3   Ground Transportation 2.3   Broadline Retail 1.6   Electronic Equipment, Instruments & Components 0.8   Entertainment 0.6   Others 0.6       Common Stocks 94.8 Preferred Stocks 0.9 Bonds 0.0 Short-Term Investments and Net Other Assets (Liabilities) 4.3 ASSET ALLOCATION (% of Fund's net assets) United States 91.4 China 4.0 Taiwan 2.0 Canada 1.3 Netherlands 1.2 United Kingdom 0.1 Estonia 0.0 Korea (South) 0.0 Israel 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     NVIDIA Corp 20.4     Apple Inc 18.7     Microsoft Corp 10.7     Marvell Technology Inc 4.3     ON Semiconductor Corp 4.3     Servicenow Inc 4.1     NXP Semiconductors NV 3.9     Salesforce Inc 2.8     GlobalFoundries Inc 2.6     Okta Inc Class A 2.6       74.4