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EQ/Clearbridge Large Cap Growth Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading EQ/ClearBridge Large Cap Growth Portfolio – Class IA, IB and K Shares
Objective [Heading] rr_ObjectiveHeading Investment Objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock Seeks to achieve long-term capital growth.
Expense [Heading] rr_ExpenseHeading FEES AND EXPENSES OF THE PORTFOLIO
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The following table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Portfolio. The table below does not reflect any fees and expenses associated with variable life insurance contracts and variable annuity certificates and contracts (“Contracts”), which would increase overall fees and expenses. See the Contract prospectus for a description of those fees and expenses.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Portfolio Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination April 30, 2022
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading PORTFOLIO TURNOVER
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Portfolio 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. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Portfolio’s performance. During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 20% of the average value of the Portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 20.00%
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Fee Waiver and/or Expense Reimbursement information has been restated to reflect the current Expense Limitation Arrangement.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This Example is intended to help you compare the cost of investing in the Portfolio with the cost of investing in other portfolios. The Example assumes that you invest $10,000 in the Portfolio for the periods indicated, that your investment has a 5% return each year, that the Portfolio’s operating expenses remain the same, and that the Expense Limitation Arrangement is not renewed. This Example does not reflect any Contract-related fees and expenses including redemption fees (if any) at the Contract level. If such fees and expenses were reflected, the total expenses would be higher. Although your actual costs may be higher or lower, based on these assumptions, whether you redeem or hold your shares, your costs would be:
Strategy [Heading] rr_StrategyHeading INVESTMENTS, RISKS, AND PERFORMANCE Principal Investment Strategy:
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock Under normal circumstances, the Portfolio invests at least 80% of its net assets, plus borrowings for investment purposes, if any, in equity securities or other instruments with similar economic characteristics of U.S. companies with large market capitalizations. Large capitalization companies are those companies with market capitalizations similar to companies in the Russell 1000
®
Index (the “Index”). The size of the companies in the Index changes with market conditions and the composition of the Index. As of December 31, 2020, the largest market capitalization of a company in the Index was approximately $2.2 trillion and the median market capitalization of a company in the Index was approximately $15.3 billion. Securities of companies whose market capitalizations no longer meet this definition after purchase by the Portfolio still will be considered securities of large capitalization companies for purposes of the Portfolio’s 80% investment policy.
 
The Portfolio may invest up to 20% of its assets in equity securities of companies other than those with market capitalizations similar to companies in the Index (i.e., medium or small capitalization companies).
 
The Portfolio also may invest up to 20% of its net assets in foreign securities, either directly or through depositary receipts.
The portfolio managers emphasize individual security selection while diversifying the Portfolio’s investments across industries, which may help to reduce risk. The portfolio managers attempt to identify established large capitalization companies with the highest growth potential. The portfolio managers then analyze each company in detail, ranking its management, strategy and competitive market position. Finally, the portfolio managers attempt to identify the best values available among the growth companies identified.
 
In selecting individual companies for investment, the portfolio managers consider:
 
 
Favorable earnings prospects
 
 
Technological innovation
 
 
Industry dominance
 
 
Competitive products and services
 
 
Global scope
 
 
Long-term operating history
 
 
Consistent and sustainable long-term growth in dividends and earnings per share
 
 
Strong cash flow
 
 
High return on equity
 
 
Strong financial condition
 
 
Experienced and effective management
 
The Portfolio also may lend its portfolio securities to earn additional income.
Risk [Heading] rr_RiskHeading Principal Risks:
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock An investment in the Portfolio is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The value of your investment may fall, sometimes sharply, and you could lose money by investing in the Portfolio. There can be no assurance that the Portfolio will achieve its investment objective.
 
The following risks can negatively affect the Portfolio’s performance. The most significant risks as of the date of this Prospectus are listed first, followed by additional risks in alphabetical order.
 
Market Risk:
The Portfolio is subject to the risk that the securities markets will move down, sometimes rapidly and unpredictably, based on overall economic conditions and other factors, which may negatively affect Portfolio performance. Securities markets also may experience long periods of decline in value. Changes in the financial condition of a single issuer can impact a market as a whole. Geo-political risks, including terrorism, tensions or open conflict between nations, or political or economic dysfunction within some nations that are major players on the world stage, may lead to instability in world economies and markets, may lead to increased market volatility, and may have adverse long-term effects. Events such as natural disasters, public health crises (such as epidemics and pandemics) and social unrest, and governments’ reactions to such events, could cause uncertainty in the markets and may adversely affect the performance of the global economy. Adverse market conditions may not have the same impact on all types of securities. In addition, markets and market participants are increasingly reliant on information data systems. Inaccurate data, software or other technology malfunctions, programming inaccuracies, unauthorized use or access, and similar circumstances may impair the performance of these systems and may have an adverse impact upon a single issuer, a group of issuers, or the market at-large.
 
Equity Risk:
 In general, the values of stocks and other equity securities fluctuate, and sometimes widely fluctuate, in response to changes in a company’s financial condition as well as general market, economic and political conditions and other factors.
 
Large-Cap Company Risk:
 Larger more established companies may be unable to respond quickly to new competitive challenges such as changes in technology and consumer tastes, which may lead to a decline in their market price. Many larger companies also may not be able to attain the high growth rate of successful smaller companies, especially during extended periods of economic expansion.
 
Investment Style Risk:
 The Portfolio may use a particular style or set of styles — in this case, a “growth” style — to select investments. A particular style may be out of favor or may not produce the best results over short or longer time periods. Growth stocks may be more sensitive to changes in current or expected earnings than the prices of other stocks. Growth investing also is subject to the risk that the stock price of one or more companies will fall or will fail to appreciate as anticipated by the Portfolio, regardless of movements in the securities market. Growth stocks also tend to be more volatile than value stocks, so in a declining market their prices may decrease more than value stocks in general. Growth stocks also may increase the volatility of the Portfolio’s share price.
 
Sector Risk:
From time to time, based on market or economic conditions, the Portfolio may have significant positions in one or more sectors of the market. To the extent the Portfolio invests more heavily in particular sectors, its performance will be especially sensitive to developments that significantly affect those sectors. Individual sectors may be more volatile, and may perform differently, than the broader market. The industries that constitute a sector may all react in the same way to economic, political or regulatory events.
 
Portfolio Management Risk:
The Portfolio is subject to the risk that strategies used by an investment manager and its securities selections fail to produce the intended results. An investment manager’s judgments or decisions about the quality, relative yield or value of, or market trends affecting, a particular security or issuer, industry, sector, region or market segment, or about the economy or interest rates, may be incorrect or otherwise may not produce the intended results, which may result in losses to the Portfolio. In addition, many processes used in Portfolio management, including security selection, rely, in whole or in part, on the use of various technologies. The Portfolio may suffer losses if there are imperfections, errors or limitations in the quantitative, analytic or other tools, resources,
information and data used, or the analyses employed or relied on, by an investment manager, or if such tools, resources, information or data are used incorrectly, fail to produce the desired results, or otherwise do not work as intended. There can be no assurance that the use of these technologies will result in effective investment decisions for the Portfolio.
 
Foreign Securities Risk:
Investments in foreign securities, including depositary receipts, involve risks in addition to those associated with investments in U.S. securities. Foreign markets may be less liquid, more volatile and subject to less government supervision and regulation than U.S. markets, and it may take more time to clear and settle trades involving foreign securities, which could negatively impact the Portfolio’s investments and cause it to lose money. Security values also may be negatively affected by changes in the exchange rates between the U.S. dollar and foreign currencies. Differences between U.S. and foreign legal, political and economic systems, regulatory regimes and market practices, as well as trade barriers and other protectionist trade policies (including those of the U.S.), governmental instability, or other political or economic actions, also may adversely impact security values. World markets, or those in a particular region, may all react in similar fashion to important economic, political or other developments. Events and evolving conditions in certain economies or markets may alter the risks associated with investments tied to countries or regions that historically were perceived as comparatively stable and make such investments riskier and more volatile. Regardless of where a company is organized or its stock is traded, its performance may be significantly affected by events in regions from which it derives its profits or in which it conducts significant operations.
 
Currency Risk:
Investments that are denominated in or that provide exposure to foreign currencies are subject to the risk that those currencies will decline in value relative to the U.S. dollar. Any such decline may erode or reverse any potential gains from an investment in securities denominated in foreign currency or may widen existing loss. In the case of hedging positions, there is the risk that the U.S. dollar will decline in value relative to the currency being hedged. Currency rates may fluctuate significantly over short periods of time.
 
Mid-Cap and Small-Cap Company Risk:
 Mid-cap and small-cap companies carry additional risks because the operating histories of these companies tend to be more limited, their earnings and revenues less predictable (and some companies may be experiencing significant losses), and their share prices more volatile than those of larger, more established companies, all of which can negatively affect their value. In general, these risks are greater for small-cap companies than for mid-cap companies.
 
Securities Lending Risk:
 The Portfolio may lend its portfolio securities to seek income. There is a risk that a borrower may default on its obligations to return loaned securities. The Portfolio will be responsible for the risks associated with the investment of cash collateral and may lose money on its investment of cash collateral or may fail to earn sufficient income on its investment to meet obligations to the borrower. Securities lending may introduce
leverage into the
Portfolio. In addition, delays may occur in the recovery of loaned securities from borrowers, which could interfere with the Portfolio’s ability to vote proxies or to settle transactions.
Risk Lose Money [Text] rr_RiskLoseMoney The value of your investment may fall, sometimes sharply, and you could lose money by investing in the Portfolio.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Portfolio is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Risk/Return Bar Chart and Table
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and table below provide some indication of the risks of investing in the Portfolio by showing changes in the Portfolio’s performance from year to year and by showing how the Portfolio’s average annual total returns for the past one, five and ten years (or since inception) through December 31, 2020 compared to the returns of a broad-based securities market index. The return of the broad-based securities market index (and any additional comparative index) shown in the right hand column below is the return of the index for the last 10 years or, if shorter, since the inception of the share class with the longest history. Past performance is not an indication of future performance.
 
Performance information for the periods prior to December 9, 2016 is that of the Portfolio when it had a different Sub-Adviser.
 
The performance results do not reflect any Contract-related fees and expenses, which would reduce the performance results.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table below provide some indication of the risks of investing in the Portfolio by showing changes in the Portfolio’s performance from year to year and by showing how the Portfolio’s average annual total returns for the past one, five and ten years (or since inception) through December 31, 2020 compared to the returns of a broad-based securities market index.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance is not an indication of future performance.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Annual Total Returns — Class IB
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
   
Best quarter (% and time period)
 
Worst quarter (% and time period)
25.91% (2020 2nd Quarter)
 
–19.41% (2011 3rd Quarter)
 
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns
EQ/Clearbridge Large Cap Growth Portfolio | Class IA Shares  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther
Management Fee rr_ManagementFeesOverAssets 0.65%
Distribution and/or Service Fees (12b-1 fees) rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.14%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.04%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.04%) [1],[2]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.00%
1 Year rr_ExpenseExampleYear01 $ 102
3 Years rr_ExpenseExampleYear03 327
5 Years rr_ExpenseExampleYear05 570
10 Years rr_ExpenseExampleYear10 1,267
1 Year rr_ExpenseExampleNoRedemptionYear01 102
3 Years rr_ExpenseExampleNoRedemptionYear03 327
5 Years rr_ExpenseExampleNoRedemptionYear05 570
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,267
One Year rr_AverageAnnualReturnYear01 30.91%
Five Years rr_AverageAnnualReturnYear05 16.87%
Ten Years rr_AverageAnnualReturnYear10 13.74%
EQ/Clearbridge Large Cap Growth Portfolio | Class IB Shares  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther
Management Fee rr_ManagementFeesOverAssets 0.65%
Distribution and/or Service Fees (12b-1 fees) rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.13%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.03%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.03%) [1],[2]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.00%
1 Year rr_ExpenseExampleYear01 $ 102
3 Years rr_ExpenseExampleYear03 325
5 Years rr_ExpenseExampleYear05 566
10 Years rr_ExpenseExampleYear10 1,257
1 Year rr_ExpenseExampleNoRedemptionYear01 102
3 Years rr_ExpenseExampleNoRedemptionYear03 325
5 Years rr_ExpenseExampleNoRedemptionYear05 566
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,257
2011 rr_AnnualReturn2011 (5.92%)
2012 rr_AnnualReturn2012 20.41%
2013 rr_AnnualReturn2013 39.07%
2014 rr_AnnualReturn2014 3.83%
2015 rr_AnnualReturn2015 1.28%
2016 rr_AnnualReturn2016 0.87%
2017 rr_AnnualReturn2017 25.56%
2018 rr_AnnualReturn2018 (0.30%)
2019 rr_AnnualReturn2019 31.98%
2020 rr_AnnualReturn2020 30.85%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 25.91%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (19.41%)
One Year rr_AverageAnnualReturnYear01 30.85%
Five Years rr_AverageAnnualReturnYear05 16.87%
Ten Years rr_AverageAnnualReturnYear10 13.71%
EQ/Clearbridge Large Cap Growth Portfolio | Class K Shares  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther
Management Fee rr_ManagementFeesOverAssets 0.65%
Distribution and/or Service Fees (12b-1 fees) rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.13%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.78%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.03%) [1],[2]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.75%
1 Year rr_ExpenseExampleYear01 $ 77
3 Years rr_ExpenseExampleYear03 246
5 Years rr_ExpenseExampleYear05 430
10 Years rr_ExpenseExampleYear10 963
1 Year rr_ExpenseExampleNoRedemptionYear01 77
3 Years rr_ExpenseExampleNoRedemptionYear03 246
5 Years rr_ExpenseExampleNoRedemptionYear05 430
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 963
One Year rr_AverageAnnualReturnYear01 31.19%
Five Years rr_AverageAnnualReturnYear05 17.17%
Since Inception rr_AverageAnnualReturnSinceInception 15.52%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 29, 2012
EQ/Clearbridge Large Cap Growth Portfolio | Russell 1000® Growth Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 38.49%
Five Years rr_AverageAnnualReturnYear05 21.00%
Ten Years rr_AverageAnnualReturnYear10 17.21%
[1] Fee Waiver and/or Expense Reimbursement information has been restated to reflect the current Expense Limitation Arrangement.
[2] Pursuant to a contract, Equitable Investment Management Group, LLC (the “Adviser”) has agreed to make payments or waive its management, administrative and other fees to limit the expenses of the Portfolio through April 30, 2022 (unless the Board of Trustees consents to an earlier revision or termination of this arrangement) (“Expense Limitation Arrangement”) so that the annual operating expenses of the Portfolio (exclusive of taxes, interest, brokerage commissions, capitalized expenses, acquired fund fees and expenses, dividend and interest expenses on securities sold short, and extraordinary expenses not incurred in the ordinary course of the Portfolio’s business) do not exceed an annual rate of average daily net assets of 1.00% for Class IA and Class IB shares and 0.75% for Class K shares of the Portfolio. The Expense Limitation Arrangement may be terminated by the Adviser at any time after April 30, 2022. The Adviser may be reimbursed the amount of any such payments or waivers made after June 30, 2020, in the future provided that the payments or waivers are reimbursed within three years of the payments or waivers being recorded and the Portfolio’s expense ratio, after the reimbursement is taken into account, does not exceed the Portfolio’s expense cap at the time of the waiver or the Portfolio’s expense cap at the time of the reimbursement, whichever is lower.