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Shareholder Report, Line Graph (Details) - USD ($)
 12 Months Ended 36 Months Ended 84 Months Ended 132 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
C000021094_LG_ClassMember_11YRMember        
Account Value [Line Items]        
Line Graph and Table Measure Name       <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Investor Class</span>
C000021094_ClassMember_AsOf_2015Member        
Account Value [Line Items]        
Accumulated Value $ 10,000      
C000021094_ClassMember_AsOf_2016Member        
Account Value [Line Items]        
Accumulated Value 11,403      
C000021094_ClassMember_AsOf_2017Member        
Account Value [Line Items]        
Accumulated Value 13,437      
C000021094_ClassMember_AsOf_2018Member        
Account Value [Line Items]        
Accumulated Value 14,601      
C000021094_ClassMember_AsOf_2019Member        
Account Value [Line Items]        
Accumulated Value 17,979      
C000021094_ClassMember_AsOf_2020Member        
Account Value [Line Items]        
Accumulated Value 17,943      
C000021094_ClassMember_AsOf_2021Member        
Account Value [Line Items]        
Accumulated Value 21,048      
C000021094_ClassMember_AsOf_2022Member        
Account Value [Line Items]        
Accumulated Value 22,181      
C000021094_ClassMember_AsOf_2023Member        
Account Value [Line Items]        
Accumulated Value 21,933      
C000021094_ClassMember_AsOf_2024Member        
Account Value [Line Items]        
Accumulated Value 28,270      
C000021094_ClassMember_AsOf_2025Member        
Account Value [Line Items]        
Accumulated Value 32,237      
C000021094_LG_1_AdditionalIndexMember_11YRMember        
Account Value [Line Items]        
Line Graph and Table Measure Name       <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI U.S. IMI Utilities 25-50 Index</span>
C000021094_1_AdditionalIndexMember_AsOf_2015Member        
Account Value [Line Items]        
Accumulated Value 10,000      
C000021094_1_AdditionalIndexMember_AsOf_2016Member        
Account Value [Line Items]        
Accumulated Value 11,762      
C000021094_1_AdditionalIndexMember_AsOf_2017Member        
Account Value [Line Items]        
Accumulated Value 13,242      
C000021094_1_AdditionalIndexMember_AsOf_2018Member        
Account Value [Line Items]        
Accumulated Value 13,843      
C000021094_1_AdditionalIndexMember_AsOf_2019Member        
Account Value [Line Items]        
Accumulated Value 17,308      
C000021094_1_AdditionalIndexMember_AsOf_2020Member        
Account Value [Line Items]        
Accumulated Value 17,181      
C000021094_1_AdditionalIndexMember_AsOf_2021Member        
Account Value [Line Items]        
Accumulated Value 20,183      
C000021094_1_AdditionalIndexMember_AsOf_2022Member        
Account Value [Line Items]        
Accumulated Value 20,433      
C000021094_1_AdditionalIndexMember_AsOf_2023Member        
Account Value [Line Items]        
Accumulated Value 18,928      
C000021094_1_AdditionalIndexMember_AsOf_2024Member        
Account Value [Line Items]        
Accumulated Value 23,319      
C000021094_1_AdditionalIndexMember_AsOf_2025Member        
Account Value [Line Items]        
Accumulated Value 27,162      
C000021094_LG_2_AdditionalIndexMember_11YRMember        
Account Value [Line Items]        
Line Graph and Table Measure Name       <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">S&P 500® Index</span>
C000021094_2_AdditionalIndexMember_AsOf_2015Member        
Account Value [Line Items]        
Accumulated Value 10,000      
C000021094_2_AdditionalIndexMember_AsOf_2016Member        
Account Value [Line Items]        
Accumulated Value 11,196      
C000021094_2_AdditionalIndexMember_AsOf_2017Member        
Account Value [Line Items]        
Accumulated Value 13,640      
C000021094_2_AdditionalIndexMember_AsOf_2018Member        
Account Value [Line Items]        
Accumulated Value 13,042      
C000021094_2_AdditionalIndexMember_AsOf_2019Member        
Account Value [Line Items]        
Accumulated Value 17,149      
C000021094_2_AdditionalIndexMember_AsOf_2020Member        
Account Value [Line Items]        
Accumulated Value 20,304      
C000021094_2_AdditionalIndexMember_AsOf_2021Member        
Account Value [Line Items]        
Accumulated Value 26,132      
C000021094_2_AdditionalIndexMember_AsOf_2022Member        
Account Value [Line Items]        
Accumulated Value 21,399      
C000021094_2_AdditionalIndexMember_AsOf_2023Member        
Account Value [Line Items]        
Accumulated Value 27,025      
C000021094_2_AdditionalIndexMember_AsOf_2024Member        
Account Value [Line Items]        
Accumulated Value 33,786      
C000021094_2_AdditionalIndexMember_AsOf_2025Member        
Account Value [Line Items]        
Accumulated Value 39,827      
C000021093_LG_ClassMember_11YRMember        
Account Value [Line Items]        
Line Graph and Table Measure Name       <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Initial Class</span>
C000021093_ClassMember_AsOf_2015Member        
Account Value [Line Items]        
Accumulated Value 10,000      
C000021093_ClassMember_AsOf_2016Member        
Account Value [Line Items]        
Accumulated Value 11,417      
C000021093_ClassMember_AsOf_2017Member        
Account Value [Line Items]        
Accumulated Value 13,459      
C000021093_ClassMember_AsOf_2018Member        
Account Value [Line Items]        
Accumulated Value 14,646      
C000021093_ClassMember_AsOf_2019Member        
Account Value [Line Items]        
Accumulated Value 18,042      
C000021093_ClassMember_AsOf_2020Member        
Account Value [Line Items]        
Accumulated Value 18,020      
C000021093_ClassMember_AsOf_2021Member        
Account Value [Line Items]        
Accumulated Value 21,162      
C000021093_ClassMember_AsOf_2022Member        
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Accumulated Value 22,319      
C000021093_ClassMember_AsOf_2023Member        
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Accumulated Value 22,079      
C000021093_ClassMember_AsOf_2024Member        
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Accumulated Value 28,482      
C000021093_ClassMember_AsOf_2025Member        
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Accumulated Value 32,500      
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Account Value [Line Items]        
Line Graph and Table Measure Name       <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI U.S. IMI Utilities 25-50 Index</span>
C000021093_1_AdditionalIndexMember_AsOf_2015Member        
Account Value [Line Items]        
Accumulated Value 10,000      
C000021093_1_AdditionalIndexMember_AsOf_2016Member        
Account Value [Line Items]        
Accumulated Value 11,762      
C000021093_1_AdditionalIndexMember_AsOf_2017Member        
Account Value [Line Items]        
Accumulated Value 13,242      
C000021093_1_AdditionalIndexMember_AsOf_2018Member        
Account Value [Line Items]        
Accumulated Value 13,843      
C000021093_1_AdditionalIndexMember_AsOf_2019Member        
Account Value [Line Items]        
Accumulated Value 17,308      
C000021093_1_AdditionalIndexMember_AsOf_2020Member        
Account Value [Line Items]        
Accumulated Value 17,181      
C000021093_1_AdditionalIndexMember_AsOf_2021Member        
Account Value [Line Items]        
Accumulated Value 20,183      
C000021093_1_AdditionalIndexMember_AsOf_2022Member        
Account Value [Line Items]        
Accumulated Value 20,433      
C000021093_1_AdditionalIndexMember_AsOf_2023Member        
Account Value [Line Items]        
Accumulated Value 18,928      
C000021093_1_AdditionalIndexMember_AsOf_2024Member        
Account Value [Line Items]        
Accumulated Value 23,319      
C000021093_1_AdditionalIndexMember_AsOf_2025Member        
Account Value [Line Items]        
Accumulated Value 27,162      
C000021093_LG_2_AdditionalIndexMember_11YRMember        
Account Value [Line Items]        
Line Graph and Table Measure Name       <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">S&P 500® Index</span>
C000021093_2_AdditionalIndexMember_AsOf_2015Member        
Account Value [Line Items]        
Accumulated Value 10,000      
C000021093_2_AdditionalIndexMember_AsOf_2016Member        
Account Value [Line Items]        
Accumulated Value 11,196      
C000021093_2_AdditionalIndexMember_AsOf_2017Member        
Account Value [Line Items]        
Accumulated Value 13,640      
C000021093_2_AdditionalIndexMember_AsOf_2018Member        
Account Value [Line Items]        
Accumulated Value 13,042      
C000021093_2_AdditionalIndexMember_AsOf_2019Member        
Account Value [Line Items]        
Accumulated Value 17,149      
C000021093_2_AdditionalIndexMember_AsOf_2020Member        
Account Value [Line Items]        
Accumulated Value 20,304      
C000021093_2_AdditionalIndexMember_AsOf_2021Member        
Account Value [Line Items]        
Accumulated Value 26,132      
C000021093_2_AdditionalIndexMember_AsOf_2022Member        
Account Value [Line Items]        
Accumulated Value 21,399      
C000021093_2_AdditionalIndexMember_AsOf_2023Member        
Account Value [Line Items]        
Accumulated Value 27,025      
C000021093_2_AdditionalIndexMember_AsOf_2024Member        
Account Value [Line Items]        
Accumulated Value 33,786      
C000021093_2_AdditionalIndexMember_AsOf_2025Member        
Account Value [Line Items]        
Accumulated Value 39,827      
C000243078_LG_ClassMember_3YRMember        
Account Value [Line Items]        
Line Graph and Table Measure Name   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Service Class 2</span>    
C000243078_ClassMember_AsOf_2023Member        
Account Value [Line Items]        
Accumulated Value 10,000      
C000243078_ClassMember_AsOf_2024Member        
Account Value [Line Items]        
Accumulated Value 11,245      
C000243078_ClassMember_AsOf_2025Member        
Account Value [Line Items]        
Accumulated Value 15,210      
C000243078_LG_1_AdditionalIndexMember_3YRMember        
Account Value [Line Items]        
Line Graph and Table Measure Name   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI U.S. IMI Information Technology 25-50 Index</span>    
C000243078_1_AdditionalIndexMember_AsOf_2023Member        
Account Value [Line Items]        
Accumulated Value 10,000      
C000243078_1_AdditionalIndexMember_AsOf_2024Member        
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C000243078_1_AdditionalIndexMember_AsOf_2025Member        
Account Value [Line Items]        
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C000243078_LG_2_AdditionalIndexMember_3YRMember        
Account Value [Line Items]        
Line Graph and Table Measure Name   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">S&P 500® Index</span>    
C000243078_2_AdditionalIndexMember_AsOf_2023Member        
Account Value [Line Items]        
Accumulated Value 10,000      
C000243078_2_AdditionalIndexMember_AsOf_2024Member        
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C000243078_2_AdditionalIndexMember_AsOf_2025Member        
Account Value [Line Items]        
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Account Value [Line Items]        
Line Graph and Table Measure Name       <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Investor Class</span>
C000021092_ClassMember_AsOf_2015Member        
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C000021092_ClassMember_AsOf_2016Member        
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C000021092_ClassMember_AsOf_2017Member        
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Accumulated Value 16,775      
C000021092_ClassMember_AsOf_2018Member        
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C000021092_ClassMember_AsOf_2019Member        
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C000021092_ClassMember_AsOf_2020Member        
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C000021092_ClassMember_AsOf_2022Member        
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Line Graph and Table Measure Name       <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI U.S. IMI Information Technology 25-50 Index</span>
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C000021092_1_AdditionalIndexMember_AsOf_2016Member        
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C000021092_1_AdditionalIndexMember_AsOf_2017Member        
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C000021092_1_AdditionalIndexMember_AsOf_2018Member        
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C000021092_1_AdditionalIndexMember_AsOf_2019Member        
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Accumulated Value 23,218      
C000021092_1_AdditionalIndexMember_AsOf_2020Member        
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C000021092_1_AdditionalIndexMember_AsOf_2021Member        
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C000021092_1_AdditionalIndexMember_AsOf_2022Member        
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C000021092_1_AdditionalIndexMember_AsOf_2023Member        
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C000021092_1_AdditionalIndexMember_AsOf_2024Member        
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Line Graph and Table Measure Name       <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">S&P 500® Index</span>
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Account Value [Line Items]        
Accumulated Value $ 10,000      
C000259873_LG_1_AdditionalIndexMember_1YRMember        
Account Value [Line Items]        
Line Graph and Table Measure Name <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI U.S. IMI Industrials 25-50 Index</span>      
C000259873_1_AdditionalIndexMember_AsOf_2025Member        
Account Value [Line Items]        
Accumulated Value $ 10,000      
C000259873_LG_2_AdditionalIndexMember_1YRMember        
Account Value [Line Items]        
Line Graph and Table Measure Name <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">S&P 500® Index</span>      
C000259873_2_AdditionalIndexMember_AsOf_2025Member        
Account Value [Line Items]        
Accumulated Value $ 10,000      
C000259875_LG_ClassMember_1YRMember        
Account Value [Line Items]        
Line Graph and Table Measure Name <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Service Class 2</span>      
C000259875_ClassMember_AsOf_2025Member        
Account Value [Line Items]        
Accumulated Value $ 10,000      
C000259875_LG_1_AdditionalIndexMember_1YRMember        
Account Value [Line Items]        
Line Graph and Table Measure Name <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI U.S. IMI Materials 25-50 Index</span>      
C000259875_1_AdditionalIndexMember_AsOf_2025Member        
Account Value [Line Items]        
Accumulated Value $ 10,000      
C000259875_LG_2_AdditionalIndexMember_1YRMember        
Account Value [Line Items]        
Line Graph and Table Measure Name <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">S&P 500® Index</span>      
C000259875_2_AdditionalIndexMember_AsOf_2025Member        
Account Value [Line Items]        
Accumulated Value $ 10,000      
C000259874_LG_ClassMember_1YRMember        
Account Value [Line Items]        
Line Graph and Table Measure Name <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Service Class 2</span>      
C000259874_ClassMember_AsOf_2025Member        
Account Value [Line Items]        
Accumulated Value $ 10,000      
C000259874_LG_1_AdditionalIndexMember_1YRMember        
Account Value [Line Items]        
Line Graph and Table Measure Name <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI U.S. IMI Utilities 25-50 Index</span>      
C000259874_1_AdditionalIndexMember_AsOf_2025Member        
Account Value [Line Items]        
Accumulated Value $ 10,000      
C000259874_LG_2_AdditionalIndexMember_1YRMember        
Account Value [Line Items]        
Line Graph and Table Measure Name <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">S&P 500® Index</span>      
C000259874_2_AdditionalIndexMember_AsOf_2025Member        
Account Value [Line Items]        
Accumulated Value $ 10,000