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EQ/Moderate Growth Strategy Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading EQ/Moderate Growth Strategy Portfolio – Class IA, IB and K Shares
Objective [Heading] rr_ObjectiveHeading Investment Objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock Seeks long-term capital appreciation and current income, with a greater emphasis on current income.
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 will not incur transaction costs, such as commissions, when it buys and sells shares of the Underlying Portfolios (or “turns over” its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the Portfolio were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs. Such costs, if incurred, would not be reflected in annual fund operating expenses or in the Example, and would affect the Portfolio’s performance. During the most recent fiscal year, the Portfolio’s portfolio turnover rate was
24
% of the average value of the Portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 24.00%
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 time 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 PERFORMANCEPrincipal Investment Strategy:
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The Portfolio pursues its investment objective by investing in other mutual funds (“Underlying Portfolios”) managed by Equitable Investment Management Group, LLC (“EIM” or “Adviser”) and sub-advised by one or more investment sub-advisers (“Sub-Adviser”). The Portfolio invests approximately 60% of its assets in equity investments and approximately 40% of its assets in fixed income investments through investments in Underlying Portfolios.
The equity asset class may include securities of small-, mid- and large-capitalization companies and exchange-traded funds. The fixed income asset class may include investment grade securities, below investment grade securities (also known as high yield or “junk” bonds), mortgage-backed securities and government securities. These securities may include securities with maturities that range from short to longer term. The asset classes may include securities of foreign issuers in addition to securities of domestic issuers. Actual allocations among asset classes can deviate from the amounts shown above by up to 15% of the Portfolio’s assets.
 
The Portfolio may invest in Underlying Portfolios that tactically manage equity exposure. The Portfolio may invest in Underlying Portfolios that employ derivatives (including futures contracts) for a variety of purposes, including to reduce risk, to seek enhanced returns from certain asset classes and to leverage exposure to certain asset classes. When market volatility is increasing above specific thresholds, such Underlying Portfolios may reduce their equity exposure. During such times, the Portfolio’s exposure to equity securities may be significantly less than if it invested in a traditional equity portfolio and the Portfolio may deviate significantly from its asset allocation targets. Although the Portfolio’s investment in Underlying Portfolios that tactically manage equity exposure is intended to reduce the
 
Portfolio’s overall risk, it may result in periods of underperformance. Volatility management techniques may reduce potential losses and/or mitigate financial risks to insurance companies that provide certain benefits and guarantees available under the Contracts and offer the Portfolio as an investment option in their products.
 
The Adviser may change the asset allocation targets and the particular Underlying Portfolios in which the Portfolio invests. The Adviser may sell the Portfolio’s holdings for a variety of reasons, including to invest in an Underlying Portfolio believed to offer superior investment opportunities.
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 Portfolio is also subject to the risks associated with the Underlying Portfolios’ investments; please see the “Information Regarding the Underlying Portfolios” section of the Portfolio’s Prospectus, and the Prospectuses and Statements of Additional Information for the Underlying Portfolios for additional information about these risks.
 
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. In this section, the term “Portfolio” may include the Portfolio, an Underlying Portfolio, or both.
 
•
  
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.
 
•
  
Asset Allocation Risk
 — The Portfolio’s investment performance depends upon how its assets are allocated across various asset classes and how its assets are invested within those asset classes. Some asset classes and investments may perform below expectations or the securities markets generally over short and extended periods. The allocation strategies used and the allocation and investment decisions made could cause the Portfolio to lose value and may not produce the desired results.
 
•
  
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.
 
•
  
Interest Rate Risk
 — Changes in interest rates may affect the yield, liquidity and value of investments in income producing or debt securities. Changes in interest rates also may affect the value of other securities. When interest rates rise, the value of the Portfolio’s debt securities generally declines. Conversely, when interest rates decline, the value of the Portfolio’s debt securities generally rises. Typically, the longer the maturity or duration of a debt security, the greater the effect a change in interest rates could have on the security’s price. Thus, the sensitivity of the Portfolio’s debt securities to interest rate risk will increase with any increase in the duration of those securities. Very low or negative interest rates may magnify interest rate risk. A significant or rapid rise in interest rates also could result in losses to the Portfolio.
 
•
  
Credit Risk
 — The Portfolio is subject to the risk that the issuer or guarantor of a fixed income security, or the counterparty to a transaction, is unable or unwilling, or is perceived as unable or unwilling, to make timely interest or principal payments, or otherwise honor its obligations, which may cause the Portfolio’s holdings to lose value. The downgrade of a security’s credit rating may decrease its value. Lower credit quality also may lead to greater volatility in the price of a security and may negatively affect a security’s liquidity. The credit quality of a security can deteriorate suddenly and rapidly.
 
•
  
Volatility Management Risk
 — The Portfolio may invest from time to time in Underlying Portfolios managed by the Adviser that may employ various volatility management
 
techniques or make short-term adjustments to their asset mix (such as by using futures and options to manage equity exposure). Although these actions are intended to reduce the overall risk of investing in an Underlying Portfolio, they may not work as intended and may result in losses by an Underlying Portfolio, and in turn, the Portfolio, or periods of underperformance, particularly during periods when market values are increasing but market volatility is high or when an Underlying Portfolio has reduced its equity exposure but market changes do not impact equity returns adversely to the extent predicted by the Adviser.
 
The result of any volatility management strategy will be subject to the Adviser’s ability to correctly assess the degree of correlation between the performance of the relevant market index and the metrics used by the Adviser to measure market volatility. Since the characteristics of many securities change as markets change or time passes, the result of any volatility management strategy also will be subject to the Adviser’s ability to continually recalculate, readjust, and execute volatility management techniques in an efficient manner. In addition, market conditions change, sometimes rapidly and unpredictably, and the Adviser may be unable to execute the volatility management strategy in a timely manner or at all.
 
The Adviser to the Underlying Portfolios uses proprietary modeling tools to implement the volatility management strategy. If the proprietary modeling tools prove to be flawed or for other reasons do not produce the desired results, any decisions based on the modeling tools may expose an Underlying Portfolio, and in turn, the Portfolio, to additional risks and losses. The use of modeling tools has inherent risks, and the success of using a modeling tool depends, among other things, on the accuracy and completeness of the tool’s development, implementation and maintenance; on the tool’s assumptions and methodologies; and on the accuracy and reliability of the inputs and output of the tool. The Adviser from time to time may make changes to its proprietary modeling tools that do not require shareholder notice.
 
Moreover, volatility management strategies may expose an Underlying Portfolio, and in turn, the Portfolio, to costs, such as increased portfolio transaction costs, which could cause or increase losses or reduce gains. In addition, it is not possible to manage volatility fully or perfectly. Futures contracts and other instruments used in connection with the volatility management strategy are not necessarily held by an Underlying Portfolio to hedge the value of the Underlying Portfolio’s other investments and, as a result, these futures contracts and other instruments may decline in value at the same time as the Underlying Portfolio’s other investments.
 
Any one or more of these factors may prevent an Underlying Portfolio from achieving the intended volatility management or could cause an Underlying Portfolio, and in turn, the Portfolio, to underperform or experience losses (some of which may be sudden or substantial) or volatility for any particular period that may be higher or lower. In addition, the use of volatility management techniques may not protect against market declines and may limit an Underlying Portfolio’s, and thus the Portfolio’s, participation in market gains, even during periods when the market is rising. Volatility management techniques, when implemented effectively to reduce the overall risk of investing in an Underlying Portfolio, may result in underperformance by an Underlying Portfolio. For example, if an Underlying Portfolio has reduced its overall exposure to equities to avoid losses in certain market environments, the Underlying Portfolio may forgo some of the returns that can be associated with periods of rising equity values. An Underlying Portfolio’s performance, and therefore the Portfolio’s performance, may be lower than similar funds where volatility management techniques are not used.
 
•
  
Risks Related to Investments in Underlying Portfolios
 —The Portfolio’s shareholders will indirectly bear fees and expenses paid by the Underlying Portfolios in which it invests, in addition to the Portfolio’s direct fees and expenses. The cost of investing in the Portfolio, therefore, may be higher than the cost of investing in a mutual fund that invests directly in individual stocks and bonds. The Portfolio’s performance depends upon a favorable allocation by the Adviser among the Underlying Portfolios, as well as the ability of the Underlying Portfolios to generate favorable performance. The Underlying Portfolios’ investment programs may not be complementary, which could adversely affect the Portfolio’s performance. The Portfolio’s net asset value is subject to fluctuations in the net asset values of the Underlying Portfolios in which it invests. The Portfolio is also subject to the risks associated with the securities or other investments in which the Underlying Portfolios invest, and the ability of the Portfolio to meet its investment objective will directly depend on the ability of the Underlying Portfolios to meet their objectives. The Portfolio and the Underlying Portfolios are subject to certain general investment risks, including market risk, asset class risk, issuer-specific risk, investment style risk and portfolio management risk. In addition, to the extent a Portfolio invests in Underlying Portfolios that invest in equity securities, fixed income securities and/or foreign securities, the Portfolio is subject to the risks associated with investing in such securities. The extent
 
to which the investment performance and risks associated with the Portfolio correlate to those of a particular Underlying Portfolio will depend upon the extent to which the Portfolio’s assets are allocated from time to time for investment in the Underlying Portfolio, which will vary.
 
•
  
Affiliated Portfolio Risk
 — The Adviser is subject to conflicts of interest in allocating the Portfolio’s assets among the various Underlying Portfolios because the revenue it receives from some of the Underlying Portfolios is higher than the revenue it receives from other Underlying Portfolios and because the Adviser is also responsible for managing, administering, and with respect to certain Underlying Portfolios, an affiliate is responsible for sub-advising, the Underlying Portfolios. The Portfolio invests in affiliated Underlying Portfolios; unaffiliated Underlying Portfolios generally are not considered for investment.
 
•
  
Derivatives Risk
 — The Portfolio’s investments in derivatives may rise or fall in value more rapidly than other investments and may reduce the Portfolio’s returns and increase the volatility of the Portfolio’s net asset value. Investing in derivatives involves investment techniques and risk analyses different from, and risks in some respects greater than, those associated with investing in more traditional investments, such as stocks and bonds. Derivatives may be leveraged such that a small investment can have a significant impact on the Portfolio’s exposure to stock market values, interest rates, or other investments. As a result, a relatively small price movement in a derivatives contract may cause an immediate and substantial loss, and the Portfolio could lose more than the amount it invested. Some derivatives can have the potential for unlimited losses. In addition, it may be difficult or impossible for the Portfolio to purchase or sell certain derivatives in sufficient amounts to achieve the desired level of exposure, or to terminate or offset existing arrangements, which may result in a loss or may be costly to the Portfolio. Some derivatives are more sensitive to market price fluctuations and to interest rate changes than other investments. Derivatives may not behave as anticipated by the Portfolio, and derivatives strategies that are successful under certain market conditions may be less successful or unsuccessful under other market conditions. The Portfolio also may be exposed to losses if the counterparty in the transaction is unable or unwilling to fulfill its contractual obligation. In certain cases, the Portfolio may be hindered or delayed in exercising remedies against or closing out derivatives with a counterparty, resulting in additional losses. Derivatives also may be subject to the risk of mispricing or improper valuation. Derivatives can be difficult to value, and valuation may be more difficult in times of market turmoil. Changing regulation may make derivatives more costly, limit their availability, impact the Portfolio’s ability to maintain its investments in derivatives, disrupt markets, or otherwise adversely affect their value or performance.
 
•
  
ETFs Risk
 — The Portfolio’s shareholders will indirectly bear fees and expenses paid by the ETFs in which it invests, in addition to the Portfolio’s direct fees and expenses. The cost of investing in the Portfolio, therefore, may be higher than the cost of investing in a mutual fund that invests directly in individual stocks and bonds. In addition, the Portfolio’s net asset value will be subject to fluctuations in the market values of the ETFs in which it invests. The Portfolio is also subject to the risks associated with the securities or other investments in which the ETFs invest, and the ability of the Portfolio to meet its investment objective will directly depend on the ability of the ETFs to meet their investment objectives. An index-based ETF’s performance may not match that of the index it seeks to track. An actively managed ETF’s performance will reflect its adviser’s ability to make investment decisions that are suited to achieving the ETF’s investment objective. It is also possible that an active trading market for an ETF may not develop or be maintained, in which case the liquidity and value of the Portfolio’s investment in the ETF could be substantially and adversely affected. The extent to which the investment performance and risks associated with the Portfolio correlate to those of a particular ETF will depend upon the extent to which the Portfolio’s assets are allocated from time to time for investment in the ETF, which will vary.
 
•
  
Foreign Securities Risk
 — Investments in foreign securities 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.
 
•
  
Futures Contract Risk
 — The primary risks associated with the use of futures contracts are (a) the imperfect correlation between the change in market value of the instruments held by the Portfolio and the price of the futures contract; (b) liquidity risks, including the possible absence of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; (c) losses (potentially unlimited) caused by unanticipated market movements; (d) an investment manager’s inability to predict correctly the direction of securities prices, interest rates, currency exchange rates and other economic factors; (e) the possibility that a counterparty, clearing member or clearinghouse will default in the performance of its obligations; (f) if the Portfolio has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements, and the Portfolio may have to sell securities at a time when it may be disadvantageous to do so; and (g) transaction costs associated with investments in futures contracts may be significant, which could cause or increase losses or reduce gains. Futures contracts are also subject to the same risks as the underlying investments to which they provide exposure. In addition, futures contracts may subject the Portfolio to leveraging risk.
 
•
  
Investment Grade Securities Risk
 — Securities rated in the lower investment grade rating categories (
e.g.
, BBB or Baa) are considered investment grade securities, but are somewhat riskier than higher rated obligations because they are regarded as having only an adequate capacity to pay principal and interest, are considered to lack outstanding investment characteristics, and may possess certain speculative characteristics.
 
•
  
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.
 
•
  
Liquidity Risk — 
From time to time, there may be little or no active trading market for a particular investment in which the Portfolio may invest or is invested. In such a market, the value of such an investment and the Portfolio’s share price may fall dramatically. Illiquid investments may be difficult or impossible to sell or purchase at an advantageous time or price or in sufficient amounts to achieve the Portfolio’s desired level of exposure. To meet redemption requests during periods of illiquidity, the Portfolio may be forced to dispose of investments at unfavorable times or prices and/or under unfavorable conditions, which may result in a loss or may be costly to the Portfolio. Investments that are illiquid or that trade in lower volumes may be more difficult to value. The Portfolio also may not receive its proceeds from the sale of certain investments for an extended period of time. Certain investments that were liquid when purchased may later become illiquid, sometimes abruptly, particularly in times of overall economic distress or adverse investor perception. An inability to sell a portfolio position can adversely affect the Portfolio’s value or prevent the Portfolio from being able to take advantage of other investment opportunities. During periods of market stress, an investment or even an entire market segment may become illiquid, sometimes abruptly, which can adversely affect the Portfolio’s ability to limit losses. In addition, a reduction in the ability or willingness of dealers and other institutional investors to make a market in certain securities may result in decreased liquidity in certain markets.
 
•
  
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.
 
•
  
Mortgage-Related and Other Asset-Backed Securities Risk
 — Declines in the credit quality of and defaults by the issuers of mortgage-related and other asset-backed securities or instability in the markets for such securities may decrease the value of such securities, which could result in losses to the Portfolio, and may reduce the liquidity of such securities and make such securities more difficult to purchase or sell at an advantageous time and price. In addition, borrowers may default on the obligations that underlie mortgage-related and other asset-backed securities. The risk of defaults by borrowers
 
generally is greater during times of rising interest rates and/or unemployment rates. The impairment (or loss) of the value of collateral or other assets underlying mortgage-related and other asset-backed securities will result in a reduction in the value of the securities. Certain collateral may be difficult to locate in the event of default, or may be lost, and recoveries of depreciated or damaged collateral may not fully cover payments due on such collateral. Asset-backed securities may not have the benefit of a security interest in collateral comparable to that of mortgage assets, resulting in additional credit risk.
 
In addition, certain mortgage-related and other asset-backed securities may include securities backed by pools of loans made to “subprime” borrowers or borrowers with blemished credit histories. The risk of defaults by borrowers is generally higher in the case of asset or mortgage pools that include subprime assets or mortgages, and the liquidity and value of subprime mortgages and
non-investment
grade mortgage-backed securities that are not guaranteed by Ginnie Mae, Fannie Mae, and Freddie Mac could change dramatically over time.
 
Furthermore, mortgage-related and other asset-backed securities typically provide the issuer with the right to prepay the security prior to maturity. During periods of rising interest rates, the rate of prepayments tends to decrease because borrowers are less likely to prepay debt (such as mortgage debt or automobile loans). Slower than expected payments can extend the average lives of mortgage-related and other asset-backed securities, and this may “lock in” a below market interest rate and increase the security’s duration and interest rate sensitivity, which may increase the volatility of the security’s value and may lead to losses. During periods of falling interest rates, the rate of prepayments tends to increase because borrowers are more likely to pay off debt and refinance at the lower interest rates then available. Unscheduled prepayments shorten the average lives of mortgage-related and other asset-backed securities and may result in the Portfolio’s having to reinvest the proceeds of the prepayments at lower interest rates, thereby reducing the Portfolio’s income.
 
•
  
Non-Investment Grade Securities Risk
 — Bonds rated below BBB by Standard & Poor’s Global Ratings or Fitch Ratings, Ltd. or below Baa by Moody’s Investors Service, Inc. (or, if unrated, determined by the investment manager to be of comparable quality) are speculative in nature and are subject to additional risk factors such as increased possibility of default, illiquidity of the security, and changes in value based on changes in interest rates. Non-investment grade bonds, sometimes referred to as “junk bonds,” are usually issued by companies without long track records of sales and earnings, or by those companies with questionable credit strength. The creditworthiness of issuers of non-investment grade debt securities may be more complex to analyze than that of issuers of investment grade debt securities, and reliance on credit ratings may present additional risks.
 
•
  
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.
 
•
  
Prepayment Risk and Extension Risk
 — Prepayment risk is the risk that the issuer of a security held by the Portfolio may pay off principal more quickly than originally anticipated. This may occur when interest rates fall. The Portfolio may have to reinvest the proceeds in an investment offering a lower yield, may not benefit from any increase in value that might otherwise result from declining interest rates and may lose any premium it paid to acquire the security. Extension risk is the risk that the issuer of a security held by the Portfolio may pay off principal more slowly than originally anticipated. This may occur when interest rates rise. The Portfolio may be prevented from reinvesting the proceeds it would have received at a given time in an investment offering a higher yield.
 
•
  
Redemption Risk
 — The Portfolio may experience periods of heavy redemptions that could cause the Portfolio to sell assets at inopportune times or at a loss or depressed value. Redemption risk is heightened during periods of declining or illiquid markets. Heavy redemptions could hurt the Portfolio’s performance.
Market developments and other factors, including
a
general rise in interest rates, have the potential to cause investors to move out of fixed income securities on a large scale, which may increase redemptions from mutual funds that hold large amounts of fixed income securities. The market-making capacity of dealers has been reduced in recent years, in part as a result of structural changes, such as fewer proprietary trading desks at broker-dealers and increased regulatory capital requirements. In addition, significant securities market disruptions related to the coronavirus disease
(COVID-19)
pandemic have led to dislocation in the market for a variety of fixed income securities (including, without limitation, commercial paper, corporate debt securities, certificates of deposit, asset-backed debt securities and municipal obligations), which has decreased liquidity and sharply reduced returns in certain cases. Increased redemptions from mutual funds that hold large amounts of fixed income securities, coupled with a reduction in the ability or willingness of dealers and other institutional investors to buy or hold fixed income securities, may result in decreased liquidity and increased volatility in the fixed income markets.
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 through December 31, 2020 compared to the returns of a broad-based securities market index. The additional broad-based securities market index and the hypothetical composite index show how the Portfolio’s performance compared with the returns of other asset classes in which the Portfolio may invest. Past performance is not an indication of future performance.
 
Class IA shares and Class K shares have not commenced operations as of the date of this Prospectus.
 
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 through December 31, 2020 compared to the returns of a broad-based securities market index.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The additional broad-based securities market index and the hypothetical composite index show how the Portfolio’s performance compared with the returns of other asset classes in which the Portfolio may invest.
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)
9.91% (2020 4th Quarter)
 
–10.54% (2011 3rd Quarter)
 
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns
EQ/Moderate Growth Strategy Portfolio | Class IA Shares  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther
Management Fee rr_ManagementFeesOverAssets 0.09%
Distribution and/or Service Fees (12b-1 fees) rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.14% [1]
Acquired Fund Fees and Expenses (Underlying Portfolios) rr_AcquiredFundFeesAndExpensesOverAssets 0.52% [1]
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.00%
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates Based on estimated amounts for the current fiscal year.
Acquired Fund Fees and Expenses, Based on Estimates [Text] rr_AcquiredFundFeesAndExpensesBasedOnEstimates Based on estimated amounts for the current fiscal year.
1 Year rr_ExpenseExampleYear01 $ 102
3 Years rr_ExpenseExampleYear03 318
5 Years rr_ExpenseExampleYear05 552
10 Years rr_ExpenseExampleYear10 1,225
1 Year rr_ExpenseExampleNoRedemptionYear01 102
3 Years rr_ExpenseExampleNoRedemptionYear03 318
5 Years rr_ExpenseExampleNoRedemptionYear05 552
10 Years rr_ExpenseExampleNoRedemptionYear10 1,225
EQ/Moderate Growth Strategy Portfolio | Class IB Shares  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther
Management Fee rr_ManagementFeesOverAssets 0.09%
Distribution and/or Service Fees (12b-1 fees) rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.14%
Acquired Fund Fees and Expenses (Underlying Portfolios) rr_AcquiredFundFeesAndExpensesOverAssets 0.52%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.00%
1 Year rr_ExpenseExampleYear01 $ 102
3 Years rr_ExpenseExampleYear03 318
5 Years rr_ExpenseExampleYear05 552
10 Years rr_ExpenseExampleYear10 1,225
1 Year rr_ExpenseExampleNoRedemptionYear01 102
3 Years rr_ExpenseExampleNoRedemptionYear03 318
5 Years rr_ExpenseExampleNoRedemptionYear05 552
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,225
2011 rr_AnnualReturn2011 (3.36%)
2012 rr_AnnualReturn2012 9.89%
2013 rr_AnnualReturn2013 16.86%
2014 rr_AnnualReturn2014 5.02%
2015 rr_AnnualReturn2015 (0.76%)
2016 rr_AnnualReturn2016 7.01%
2017 rr_AnnualReturn2017 11.82%
2018 rr_AnnualReturn2018 (5.17%)
2019 rr_AnnualReturn2019 18.00%
2020 rr_AnnualReturn2020 12.38%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 9.91%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (10.54%)
One Year rr_AverageAnnualReturnYear01 12.38%
Five Years rr_AverageAnnualReturnYear05 8.52%
Ten Years rr_AverageAnnualReturnYear10 6.89%
EQ/Moderate Growth Strategy Portfolio | Class K Shares  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther
Management Fee rr_ManagementFeesOverAssets 0.09%
Distribution and/or Service Fees (12b-1 fees) rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.14% [1]
Acquired Fund Fees and Expenses (Underlying Portfolios) rr_AcquiredFundFeesAndExpensesOverAssets 0.52% [1]
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.75%
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates Based on estimated amounts for the current fiscal year.
Acquired Fund Fees and Expenses, Based on Estimates [Text] rr_AcquiredFundFeesAndExpensesBasedOnEstimates Based on estimated amounts for the current fiscal year.
1 Year rr_ExpenseExampleYear01 $ 77
3 Years rr_ExpenseExampleYear03 240
5 Years rr_ExpenseExampleYear05 417
10 Years rr_ExpenseExampleYear10 930
1 Year rr_ExpenseExampleNoRedemptionYear01 77
3 Years rr_ExpenseExampleNoRedemptionYear03 240
5 Years rr_ExpenseExampleNoRedemptionYear05 417
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 930
EQ/Moderate Growth Strategy Portfolio | EQ/Moderate Growth Strategy Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 12.75%
Five Years rr_AverageAnnualReturnYear05 9.26%
Ten Years rr_AverageAnnualReturnYear10 8.11%
EQ/Moderate Growth Strategy Portfolio | S&P 500® Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 18.40%
Five Years rr_AverageAnnualReturnYear05 15.22%
Ten Years rr_AverageAnnualReturnYear10 13.88%
EQ/Moderate Growth Strategy Portfolio | Bloomberg Barclays U.S. Intermediate Government Bond Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 5.73%
Five Years rr_AverageAnnualReturnYear05 2.89%
Ten Years rr_AverageAnnualReturnYear10 2.46%
[1] Based on estimated amounts for the current fiscal year.