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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName FIDELITY SELECT PORTFOLIOS
Prospectus Date rr_ProspectusDate Nov. 30, 2018
NF_ 02.28 Fidelity Communication Services Portfolio_ AMCIZ PRO-01 | Communication Services Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading <p style="font: bold 20pt Arial, Helvetica, sans-serif;">Fund Summary</p><p style="font: normal 12pt Arial, Helvetica, sans-serif;"><b>Fund/Class</b>:<br/><b>Communication Services Portfolio</b>/Fidelity Advisor<sup>®</sup> Communication Services Fund A, M, C, I, Z</p>
Objective [Heading] rr_ObjectiveHeading <font style="font: bold 16pt Arial, Helvetica, sans-serif;">Investment Objective</font>
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.
Expense [Heading] rr_ExpenseHeading <font style="font: bold 16pt Arial, Helvetica, sans-serif;"><b>Fee Table</b></font>
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund. In addition to the fees and expenses described below, your broker may also require you to pay brokerage commissions on purchases and sales of certain share classes of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 29 of the prospectus. Different intermediaries may provide additional waivers or reductions of the sales charge. Please see “Sales Charge Waiver Policies Applied by Certain Intermediaries” in the “Appendix” section of the prospectus.

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption <p style="font: bold 11pt Arial, sans-serif; margin-bottom: 0px;">Shareholder fees</p><p style="font: bold 9pt Arial, sans-serif; margin-top: 0px">(fees paid directly from your investment)</p>
Operating Expenses Caption [Text] rr_OperatingExpensesCaption <p style="font: bold 11pt Arial, sans-serif; margin-bottom: 0px;">Annual Operating Expenses</p><p style="font: bold 9pt Arial, sans-serif; margin-top: 0px">(expenses that you pay each year as a % of the value of your investment)</p>
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading <font style="font: bold 16pt Arial, Helvetica, sans-serif;"><b>Portfolio Turnover</b></font>
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 22% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 22.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts <font style="FONT-FAMILY: Times New Roman" size="3">You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 29 of the prospectus.</font>
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates <font style="FONT-FAMILY: Times New Roman" size="3">Based on estimated amounts for the current fiscal year.</font>
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated and if you hold your shares:

Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption <p style="font: bold 9pt Arial, sans-serif; margin-top: 0px">Sell All Shares</p>
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption <p style="font: bold 9pt Arial, sans-serif; margin-top: 0px">Hold Shares</p>
Strategy [Heading] rr_StrategyHeading <font style="font: bold 16pt Arial, Helvetica, sans-serif;"><b>Principal Investment Strategies</b></font>
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
  • Normally investing primarily in common stocks.
  • Normally investing at least 80% of assets in securities of companies principally engaged in the development, production, or distribution of communication services.
  • Investing in domestic and foreign issuers.
  • Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration <font style="FONT-FAMILY: Times New Roman" size="3">Normally investing at least 80% of assets in securities of companies principally engaged in the development, production, or distribution of communication services.</font>
Risk [Heading] rr_RiskHeading <font style="font: bold 16pt Arial, Helvetica, sans-serif;"><b>Principal Investment Risks</b></font>
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
  • Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.
  • Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.
  • Communication Services Concentration. The communication services industries can be significantly affected by government regulation, intense competition, technology changes, general economic conditions, consumer and business confidence and spending, and changes in consumer and business preferences.
  • Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is classified as non-diversified under the Investment Company Act of 1940, which means that it has the ability to invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text] rr_RiskLoseMoney <font style="FONT-FAMILY: Times New Roman" size="3">You could lose money by investing in the fund.</font>
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus <font style="FONT-FAMILY: Times New Roman" size="3">In addition, the fund is classified as non-diversified under the Investment Company Act of 1940, which means that it has the ability to invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.</font>
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution <font style="FONT-FAMILY: Times New Roman" size="3">An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</font>
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading <font style="font: bold 16pt Arial, Helvetica, sans-serif;"><b>Performance</b></font>
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the retail class of the fund, from year to year and compares the performance of this class to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information for the fund's retail class.

Performance history will be available at institutional.fidelity.com for Class A, Class M, Class C, Class I, and Class Z, after Class A, Class M, Class C, Class I, and Class Z have been in operation for one calendar year.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns <font style="FONT-FAMILY: Times New Roman" size="3">The information illustrates the changes in the performance of the retail class of the fund, from year to year and compares the performance of this class to the performance of a securities market index and an additional index over various periods of time.</font>
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress <font style="FONT-FAMILY: Times New Roman" size="3">www.fidelity.com</font>
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture <font style="FONT-FAMILY: Times New Roman" size="3">Past performance (before and after taxes) is not an indication of future performance.</font>
Bar Chart [Heading] rr_BarChartHeading <p style="font:bold 11pt Arial, sans-serif; margin-bottom: 0px;">Year-by-Year Returns*</p><p style="font: bold 9pt Arial, sans-serif; margin-top: 0px">Calendar Years</p>
Bar Chart Narrative [Text Block] rr_BarChartNarrativeTextBlock

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads <font style="FONT-FAMILY: Times New Roman" size="3">The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.</font>
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the periods shown in the chart:ReturnsQuarter ended
Highest Quarter Return26.72%June 30, 2009
Lowest Quarter Return-24.41%December 31, 2008
Year-to-Date Return7.86%September 30, 2018
Bar Chart, Returns for Class Not Offered in Prospectus [Text] rr_BarChartReturnsForClassNotOfferedInProspectus <font style="FONT-FAMILY: Times New Roman" size="3">* The returns shown above are for the retail class of the fund, which is not offered through this prospectus. Class A, Class M, Class C, Class I, and Class Z would have substantially similar returns to the retail class because the classes are invested in the same portfolio of securities. Class A's, Class M's, Class C's, Class I's, and Class Z's returns will be lower than the retail class' returns to the extent that Class A, Class M, Class C, Class I, and Class Z have higher expenses.</font>
Performance Table Heading rr_PerformanceTableHeading <font style="font: bold 16pt Arial, Helvetica, sans-serif;"><b>Average Annual Returns*</b></font>
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged <font style="FONT-FAMILY: Times New Roman" size="3">Prior to December 1, 2018, the fund was named Multimedia Portfolio and operated under certain different investment policies. The fund's historical performance may not represent its current investment policies. Beginning December 1, 2018, the fund will compare its performance to MSCI US IM Communication Services 25/50 (Media Linked) Index rather than MSCI US IM Media 25/50 Index because the MSCI US IM Communication Services 25/50 (Media Linked) Index conforms more closely to the fund's investment policies.</font>
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate <font style="FONT-FAMILY: Times New Roman" size="3">After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.</font>
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred <font style="FONT-FAMILY: Times New Roman" size="3">The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).</font>
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2017

* The returns shown above are for the retail class of the fund, which is not offered through this prospectus. Class A, Class M, Class C, Class I, and Class Z would have substantially similar returns to the retail class because the classes are invested in the same portfolio of securities. Class A's, Class M's, Class C's, Class I's, and Class Z's returns will be lower than the retail class' returns to the extent that Class A, Class M, Class C, Class I, and Class Z have higher expenses.

On October 17, 2018 shareholders approved a proposal to change the concentration policy of the fund. Effective December 1, 2018, the fund will concentrate in communication services companies and the fund’s investment policies will change to reflect the fund’s amended concentration policy.

Prior to December 1, 2018, the fund was named Multimedia Portfolio and operated under certain different investment policies. The fund's historical performance may not represent its current investment policies. Beginning December 1, 2018, the fund will compare its performance to MSCI US IM Communication Services 25/50 (Media Linked) Index rather than MSCI US IM Media 25/50 Index because the MSCI US IM Communication Services 25/50 (Media Linked) Index conforms more closely to the fund's investment policies.

NF_ 02.28 Fidelity Communication Services Portfolio_ AMCIZ PRO-01 | Communication Services Portfolio | Fidelity Advisor Communication Services Fund Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice 5.75%
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none [1]
Management fee rr_ManagementFeesOverAssets 0.54%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.27% [2]
Total annual operating expenses rr_ExpensesOverAssets 1.06%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.
1 year rr_ExpenseExampleYear01 $ 677
3 years rr_ExpenseExampleYear03 893
5 years rr_ExpenseExampleYear05 1,126
10 years rr_ExpenseExampleYear10 1,795
1 Year rr_ExpenseExampleNoRedemptionYear01 677
3 Years rr_ExpenseExampleNoRedemptionYear03 893
5 Years rr_ExpenseExampleNoRedemptionYear05 1,126
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,795
NF_ 02.28 Fidelity Communication Services Portfolio_ AMCIZ PRO-01 | Communication Services Portfolio | Fidelity Advisor Communication Services Fund Class M  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice 3.50%
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none [1]
Management fee rr_ManagementFeesOverAssets 0.54%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other expenses rr_OtherExpensesOverAssets 0.27% [2]
Total annual operating expenses rr_ExpensesOverAssets 1.31%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.
1 year rr_ExpenseExampleYear01 $ 479
3 years rr_ExpenseExampleYear03 751
5 years rr_ExpenseExampleYear05 1,043
10 years rr_ExpenseExampleYear10 1,874
1 Year rr_ExpenseExampleNoRedemptionYear01 479
3 Years rr_ExpenseExampleNoRedemptionYear03 751
5 Years rr_ExpenseExampleNoRedemptionYear05 1,043
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,874
NF_ 02.28 Fidelity Communication Services Portfolio_ AMCIZ PRO-01 | Communication Services Portfolio | Fidelity Advisor Communication Services Fund Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 1.00% [3]
Management fee rr_ManagementFeesOverAssets 0.54%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.27% [2]
Total annual operating expenses rr_ExpensesOverAssets 1.81%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock On Class C shares redeemed less than one year after purchase.
1 year rr_ExpenseExampleYear01 $ 284
3 years rr_ExpenseExampleYear03 569
5 years rr_ExpenseExampleYear05 980
10 years rr_ExpenseExampleYear10 2,127
1 Year rr_ExpenseExampleNoRedemptionYear01 184
3 Years rr_ExpenseExampleNoRedemptionYear03 569
5 Years rr_ExpenseExampleNoRedemptionYear05 980
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,127
NF_ 02.28 Fidelity Communication Services Portfolio_ AMCIZ PRO-01 | Communication Services Portfolio | Fidelity Advisor Communication Services Fund Class I  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management fee rr_ManagementFeesOverAssets 0.54%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.24% [2]
Total annual operating expenses rr_ExpensesOverAssets 0.78%
1 year rr_ExpenseExampleYear01 $ 80
3 years rr_ExpenseExampleYear03 249
5 years rr_ExpenseExampleYear05 433
10 years rr_ExpenseExampleYear10 966
1 Year rr_ExpenseExampleNoRedemptionYear01 80
3 Years rr_ExpenseExampleNoRedemptionYear03 249
5 Years rr_ExpenseExampleNoRedemptionYear05 433
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 966
NF_ 02.28 Fidelity Communication Services Portfolio_ AMCIZ PRO-01 | Communication Services Portfolio | Fidelity Advisor Communication Services Fund Class Z  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management fee rr_ManagementFeesOverAssets 0.54%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.10% [2]
Total annual operating expenses rr_ExpensesOverAssets 0.64%
1 year rr_ExpenseExampleYear01 $ 65
3 years rr_ExpenseExampleYear03 205
5 years rr_ExpenseExampleYear05 357
10 years rr_ExpenseExampleYear10 798
1 Year rr_ExpenseExampleNoRedemptionYear01 65
3 Years rr_ExpenseExampleNoRedemptionYear03 205
5 Years rr_ExpenseExampleNoRedemptionYear05 357
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 798
NF_ 02.28 Fidelity Communication Services Portfolio_ AMCIZ PRO-01 | Communication Services Portfolio | Communication Services Portfolio  
Risk/Return: rr_RiskReturnAbstract  
2008 rr_AnnualReturn2008 (39.29%)
2009 rr_AnnualReturn2009 54.41%
2010 rr_AnnualReturn2010 25.80%
2011 rr_AnnualReturn2011 1.83%
2012 rr_AnnualReturn2012 34.22%
2013 rr_AnnualReturn2013 45.65%
2014 rr_AnnualReturn2014 8.29%
2015 rr_AnnualReturn2015 (2.17%)
2016 rr_AnnualReturn2016 9.50%
2017 rr_AnnualReturn2017 12.59%
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-Date Return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2018
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 7.86%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 26.72%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (24.41%)
NF_ 02.28 Fidelity Communication Services Portfolio_ AMCIZ PRO-01 | Communication Services Portfolio | Return Before Taxes | Communication Services Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Communication Services Portfolio
Label rr_AverageAnnualReturnLabel <font style="FONT-FAMILY: Times New Roman" ><b>Return Before Taxes</b></font>
Past 1 year rr_AverageAnnualReturnYear01 12.59%
Past 5 years rr_AverageAnnualReturnYear05 13.73%
Past 10 years rr_AverageAnnualReturnYear10 11.86%
NF_ 02.28 Fidelity Communication Services Portfolio_ AMCIZ PRO-01 | Communication Services Portfolio | After Taxes on Distributions | Communication Services Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Communication Services Portfolio
Label rr_AverageAnnualReturnLabel <font style="FONT-FAMILY: Times New Roman" ><b>Return After Taxes on Distributions</b></font>
Past 1 year rr_AverageAnnualReturnYear01 11.17%
Past 5 years rr_AverageAnnualReturnYear05 12.02%
Past 10 years rr_AverageAnnualReturnYear10 10.92%
NF_ 02.28 Fidelity Communication Services Portfolio_ AMCIZ PRO-01 | Communication Services Portfolio | After Taxes on Distributions and Sales | Communication Services Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Communication Services Portfolio
Label rr_AverageAnnualReturnLabel <font style="FONT-FAMILY: Times New Roman" ><b>Return After Taxes on Distributions and Sale of Fund Shares</b></font>
Past 1 year rr_AverageAnnualReturnYear01 8.29%
Past 5 years rr_AverageAnnualReturnYear05 10.79%
Past 10 years rr_AverageAnnualReturnYear10 9.76%
NF_ 02.28 Fidelity Communication Services Portfolio_ AMCIZ PRO-01 | Communication Services Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Past 1 year rr_AverageAnnualReturnYear01 21.83%
Past 5 years rr_AverageAnnualReturnYear05 15.79%
Past 10 years rr_AverageAnnualReturnYear10 8.50%
NF_ 02.28 Fidelity Communication Services Portfolio_ AMCIZ PRO-01 | Communication Services Portfolio | MSCI US IM Media 25/50 Index(reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Past 1 year rr_AverageAnnualReturnYear01 9.10%
Past 5 years rr_AverageAnnualReturnYear05 14.34%
Past 10 years rr_AverageAnnualReturnYear10 12.15%
[1] Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.
[2] Based on estimated amounts for the current fiscal year.
[3] On Class C shares redeemed less than one year after purchase.