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Multimanager Aggressive Equity Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Multimanager Aggressive Equity Portfolio – Class IA, IB and K Shares
Objective [Heading] rr_ObjectiveHeading Investment Objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock Seeks to achieve long-term growth of capital.
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 thevalue of your investment)
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 60% of the average value of the Portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 60.00%
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, and that the Portfolio’s operating expenses remain the same. 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 intends to invest at least 80% of its net assets, plus borrowings for investment purposes, in equity securities. For purposes of this Portfolio, equity securities shall include common stocks, preferred stocks, and other equity securities, and financial instruments that derive their value from such securities. The Portfolio invests primarily in securities of large capitalization growth companies. For purposes of this Portfolio, large capitalization companies are companies with market capitalization within the range of the Russell 3000
®
Growth Index (“Russell 3000 Growth”) at the time of investment (market capitalization range of approximately $
44.7 million to $
2.2 trillion as of December 31, 2020). The Portfolio intends to invest primarily in common stocks, but may also invest in other equity securities that a
Sub-Adviser
believes provide opportunities for capital growth. The size of companies in the Russell 3000 Growth changes with market conditions, which can result in changes to the market capitalization range of companies in the index. The Portfolio may invest up to 15% of its total assets in securities of foreign issuers, including emerging market securities and depositary receipts.
 
The Adviser will generally allocate the Portfolio’s assets among three or more Sub-Advisers, each of which will manage its portion of the Portfolio using different yet complementary investment strategies. Under normal circumstances, one portion of the Portfolio will track the performance of a particular index (“Index Allocated Portion”) and the other portions of the Portfolio will be actively managed (“Active Allocated Portions”). Under normal circumstances, the Adviser anticipates allocating approximately 50% of the Portfolio’s net assets to the Index Allocated Portion and the remaining 50% of the Portfolio’s net assets among the Active Allocated Portions. These percentages are targets established by the Adviser and actual allocations between the portions may deviate from these targets by up to 20% of the Portfolio’s net assets.
 
The Index Allocated Portion of the Portfolio seeks to track the performance (before fees and expenses) of the Russell 3000 Growth with minimal tracking error. This strategy is commonly referred to as indexing strategy. Generally, the Index Allocated Portion utilizes a sampling construction process in which the Index Allocated Portion invests in a subset of the companies represented in the Russell 3000
Growth based on the Sub-Adviser’s analysis of key risk factors and characteristics. Such factors and characteristics include industry weightings, market capitalizations, return variability and yield.
 
Each Active Allocated Portion invests primarily in equity securities of companies whose above-average prospective earnings growth is not fully reflected, in the view of the Sub-Adviser, in current market valuations. The Active Allocated Portions may invest up to 25% of their total assets in securities of foreign companies, including companies based in developing countries. A Sub-Adviser may sell a security for a variety of reasons, such as to make other investments believed by the Sub-Adviser to offer superior investment opportunities.
 
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 disaster, 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.
 
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.
 
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.
 
Index Strategy Risk:
The Portfolio (or a portion thereof) employs an index strategy and generally will not modify its index strategy to respond to changes in market trends or the economy, which means that the Portfolio may be particularly susceptible to a general decline in the market segment relating to the relevant index. In addition, although the index strategy attempts to closely track the relevant index, the Portfolio may not invest in all of the securities in the index. Therefore, there can be no assurance that the performance of the index strategy will match that of the relevant index. To the extent the Portfolio utilizes a representative sampling approach, it may experience tracking error to a greater extent than if the Portfolio sought to replicate the index.
 
To the extent that the securities of a limited number of companies represent a significant percentage of the relevant index, the Portfolio may be subject to more risk because changes in the value of a single security may have a more significant effect, either positive or negative, on the Portfolio’s net asset value. The Portfolio may experience greater performance volatility than a portfolio that seeks to track the performance of an index that is more broadly diversified.
 
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.
 
Emerging Markets Risk:
Investments in emerging market countries are more susceptible to loss than investments in more developed foreign countries and may present market, credit, currency, liquidity, legal, political, technical and other risks different from, or greater than, the risks of investing in more developed foreign countries. Emerging market countries may be more likely to experience rapid and significant adverse developments in their political or economic structures, intervene in financial markets, restrict foreign investments, impose high withholding or other taxes on foreign investments, impose restrictive exchange control regulations, or nationalize or expropriate the assets of private companies, which may have negative impacts on transaction costs, market price, investment returns and the legal rights and remedies available to the Portfolio. In addition, the securities markets of emerging markets countries generally are smaller, less liquid and more volatile than those of more developed foreign countries, and emerging market countries often have less uniformity in regulatory, accounting, auditing and financial reporting requirements or standards, which may impact the availability and quality of information about issuers, and less reliable clearance and settlement, registration and custodial procedures. Securities of issuers traded on foreign exchanges may be suspended. The likelihood of such suspensions may be higher for securities of issuers in emerging market countries than in countries with more developed markets. The risks associated with investments in emerging market countries often are significant, and vary from jurisdiction to jurisdiction and company to company.
 
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.
 
Multiple Sub-Adviser Risk:
To a significant extent, the Portfolio’s performance will depend on the success of the Adviser in allocating the Portfolio’s assets to Sub-Advisers and its selection and oversight of the Sub-Advisers. The Sub-Advisers’ investment strategies may not work together as planned, which could adversely affect the Portfolio’s performance. Because each Sub-Adviser directs the trading for its own portion of the Portfolio, and does not aggregate its transactions with those of the other Sub-Adviser, the Portfolio may incur higher brokerage costs than would be the case if a single Sub-Adviser were managing the entire Portfolio. In addition, while the Adviser seeks to allocate the Portfolio’s assets among the Portfolio’s Sub-Advisers in a manner that it believes is consistent with achieving the Portfolio’s investment objective(s), the Adviser is subject to conflicts of interest in allocating the Portfolio’s assets among
Sub-Advisers, including affiliated Sub-Advisers, because the Adviser pays different fees to the Sub-Advisers and due to other factors that could impact the Adviser’s revenues and profits.
 
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.
 
The performance results do not reflect any Contract-related fees and expenses, which would reduce the performance results.
 
Prior to April 2014, the Portfolio employed a volatility management strategy; returns prior to that date may have been different if the Portfolio had followed its current policies. For periods prior to June 2014, the performance shown below is that of the Portfolio’s predecessor, a series of EQ Premier VIP Trust that had a substantially identical investment objective, policies and strategies.
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)
29.39% (2020 2nd Quarter)
 
–17.04% (2011 3rd Quarter)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns
Multimanager Aggressive Equity Portfolio | Class IA Shares  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther
Management Fee rr_ManagementFeesOverAssets 0.57%
Distribution and/or Service Fees (12b-1 fees) rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.15%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.97%
1 Year rr_ExpenseExampleYear01 $ 99
3 Years rr_ExpenseExampleYear03 309
5 Years rr_ExpenseExampleYear05 536
10 Years rr_ExpenseExampleYear10 1,190
1 Year rr_ExpenseExampleNoRedemptionYear01 99
3 Years rr_ExpenseExampleNoRedemptionYear03 309
5 Years rr_ExpenseExampleNoRedemptionYear05 536
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,190
One Year rr_AverageAnnualReturnYear01 38.83%
Five Years rr_AverageAnnualReturnYear05 20.02%
Ten Years rr_AverageAnnualReturnYear10 15.48%
Multimanager Aggressive Equity Portfolio | Class IB Shares  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther
Management Fee rr_ManagementFeesOverAssets 0.57%
Distribution and/or Service Fees (12b-1 fees) rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.15%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.97%
1 Year rr_ExpenseExampleYear01 $ 99
3 Years rr_ExpenseExampleYear03 309
5 Years rr_ExpenseExampleYear05 536
10 Years rr_ExpenseExampleYear10 1,190
1 Year rr_ExpenseExampleNoRedemptionYear01 99
3 Years rr_ExpenseExampleNoRedemptionYear03 309
5 Years rr_ExpenseExampleNoRedemptionYear05 536
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,190
2011 rr_AnnualReturn2011 (6.33%)
2012 rr_AnnualReturn2012 14.19%
2013 rr_AnnualReturn2013 37.14%
2014 rr_AnnualReturn2014 10.68%
2015 rr_AnnualReturn2015 4.00%
2016 rr_AnnualReturn2016 3.43%
2017 rr_AnnualReturn2017 30.35%
2018 rr_AnnualReturn2018 (0.20%)
2019 rr_AnnualReturn2019 33.35%
2020 rr_AnnualReturn2020 38.82%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 29.39%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (17.04%)
One Year rr_AverageAnnualReturnYear01 38.82%
Five Years rr_AverageAnnualReturnYear05 20.02%
Ten Years rr_AverageAnnualReturnYear10 15.45%
Multimanager Aggressive Equity Portfolio | Class K Shares  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther
Management Fee rr_ManagementFeesOverAssets 0.57%
Distribution and/or Service Fees (12b-1 fees) rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.15%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.72%
1 Year rr_ExpenseExampleYear01 $ 74
3 Years rr_ExpenseExampleYear03 230
5 Years rr_ExpenseExampleYear05 401
10 Years rr_ExpenseExampleYear10 894
1 Year rr_ExpenseExampleNoRedemptionYear01 74
3 Years rr_ExpenseExampleNoRedemptionYear03 230
5 Years rr_ExpenseExampleNoRedemptionYear05 401
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 894
One Year rr_AverageAnnualReturnYear01 39.18%
Five Years rr_AverageAnnualReturnYear05 20.32%
Since Inception rr_AverageAnnualReturnSinceInception 18.07%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 26, 2011
Multimanager Aggressive Equity Portfolio | Russell 3000® Growth Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 38.26%
Five Years rr_AverageAnnualReturnYear05 20.67%
Ten Years rr_AverageAnnualReturnYear10 16.93%