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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName EQ ADVISORS TRUST
Prospectus Date rr_ProspectusDate May 01, 2020
EQ/500 Managed Volatility Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading EQ/500 Managed Volatility Portfolio – Class IA, IB and K Shares
Objective [Heading] rr_ObjectiveHeading Investment Objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Portfolio seeks to achieve long-term growth of capital with an emphasis on risk-adjusted returns and managing volatility in the Portfolio.
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 and hold 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)
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 4% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 4.00%
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Management Fee has been restated to reflect the current fee.
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 PERFORMANCE Principal Investment Strategy:
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The Portfolio is divided into two portions, one of which utilizes a passive investment index style focused on equity securities of large-capitalization companies and a second portion which utilizes an actively managed futures and options strategy to tactically manage equity exposure in the Portfolio based on the level of volatility in the market. The combination of these strategies is intended to produce better risk-adjusted returns over time than investing exclusively in a passively managed portfolio of securities.

The Portfolio generally allocates approximately 90% of its net assets to a portion of the Portfolio that invests in the common stocks of companies included in the Standard & Poor’s 500® Composite Stock Price Index (“S&P 500 Index”) in a manner that is intended to track the performance (before fees and expenses) of that index, commonly referred to as an indexing strategy. This percentage may range from 0% to 100% of the Portfolio’s net assets depending on the level of volatility in the market. These investments typically represent the large-capitalization sector of the U.S. equity market. As of December 31, 2019, the market capitalization of companies in this index ranged from $4.6 billion to $1,305 billion. The Portfolio also may invest in exchange-traded funds (“ETFs”) that seek to track the S&P 500 Index and in other instruments, such as futures and options contracts, that provide exposure to the index.

The other portion of the Portfolio invests in futures and options contracts, including contracts on the S&P 500 Index, and other strategies to manage the Portfolio’s equity exposure. During periods when certain quantitative market indicators indicate that market volatility is high or is likely to increase, this portion of the Portfolio may implement strategies that are intended to reduce the Portfolio’s equity exposure and, therefore, the risk of market losses from investing in equity securities. This portion of the Portfolio may reduce equity exposure in the Portfolio using a variety of strategies, including shorting or selling its long futures positions on an index, entering into short futures positions on an index, or increasing cash levels, or a combination of some or all of these strategies. During such times, the Portfolio’s exposure to equity securities may be significantly less than that of a traditional equity portfolio, but may remain sizable. Conversely, when the market volatility indicators decrease, this portion of the Portfolio may increase equity exposure in the Portfolio such as by investing in futures contracts on an index or by investing in ETFs that provide comparable exposure as an index. During periods of heightened market volatility, the Portfolio’s exposure to equity securities may remain sizable if, in the investment adviser’s judgment, such exposure is warranted in order to produce better risk-adjusted returns over time. Volatility is a statistical measure of the magnitude of changes in the Portfolio’s returns, without regard to the direction of those changes. Higher volatility generally indicates higher risk and is often reflected by frequent and sometimes significant movements up and down in value. 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 Portfolio’s investments in derivatives may involve the use of leverage because the Portfolio is not required to invest the full market value of the contract upon entering into the contract but participates in gains and losses on the full contract price. The use of derivatives also may involve the use of leverage because the heightened price sensitivity of some derivatives to market changes may magnify the Portfolio’s gain or loss. It is not generally expected, however, that the Portfolio will be leveraged by borrowing money for investment purposes. The Portfolio may maintain a significant percentage of its assets in cash and cash equivalent instruments, some of which may serve as margin or collateral for the Portfolio’s obligations under derivative transactions.

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 are listed first, followed by additional risks in alphabetical order.

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 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.

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.

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.

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.

Volatility Management Risk: The Adviser from time to time may employ various volatility management techniques or make short-term adjustments to the Portfolio’s asset mix (such as by using ETFs or futures and options to manage equity exposure) in managing the Portfolio. Although these actions are intended to reduce the overall risk of investing in the Portfolio, they may not work as intended and may result in losses by the Portfolio or periods of underperformance, particularly during periods when market values are increasing but market volatility is high or when the 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 the Portfolio’s 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 the Portfolio’s 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 uses proprietary modeling tools to implement the Portfolio’s 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 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 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 the Portfolio to hedge the value of the Portfolio’s other investments and, as a result, these futures contracts and other instruments may decline in value at the same time as the Portfolio’s other investments. Any one or more of these factors may prevent the Portfolio from achieving the intended volatility management or could cause 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 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 the Portfolio, may result in underperformance by the Portfolio. For example, if the Portfolio has reduced its overall exposure to equities to avoid losses in certain market environments, the Portfolio may forgo some of the returns that can be associated with periods of rising equity values. The Portfolio’s performance may be lower than the performance of similar funds where volatility management techniques are not used.

Cash Management Risk: Upon entering into certain derivatives contracts, such as futures contracts, and to maintain open positions in certain derivatives contracts, the Portfolio may be required to post collateral for the contract, the amount of which may vary. In addition, the Portfolio may maintain cash and cash equivalent positions as part of the Portfolio’s strategy in order to take advantage of investment opportunities as they arise, to manage the Portfolio’s market exposure and for other portfolio management purposes. As such, the Portfolio may maintain cash balances, which may be significant, with counterparties such as the Trust’s custodian or its affiliates. Maintaining larger cash and cash equivalent positions could negatively affect the Portfolio’s performance due to missed investment opportunities and may also subject the Portfolio to additional risks, such as increased credit risk with respect to the custodian bank holding the assets and the risk that a counterparty may be unable or unwilling to honor its obligations.

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.

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.

Large Shareholder Risk: A significant percentage of the Portfolio’s shares may be owned or controlled by the Adviser and its affiliates, other Portfolios advised by the Adviser (including funds of funds), or other large shareholders, including primarily insurance company separate accounts. Accordingly, the Portfolio is subject to the potential for large-scale inflows and outflows as a result of purchases and redemptions of its shares by such shareholders. These inflows and outflows could negatively affect the Portfolio’s net asset value and performance.

Leveraging Risk: When the Portfolio leverages its holdings, the value of an investment in the Portfolio will be more volatile and all other risks will tend to be compounded. Investments that create leverage can result in losses to the Portfolio that exceed the amount originally invested and may accelerate the rate of losses (some of which may be sudden or substantial). For certain investments that create leverage, relatively small market fluctuations can result in large changes in the value of such investments. There can be no assurance that the Portfolio’s use of any leverage will be successful.

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 or pandemics, and governments’ reactions to such events, could cause uncertainty in the markets and may adversely affect the performance of the global economy. 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.

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.

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.

Short Position Risk: The Portfolio may engage in short sales and may enter into derivative contracts that have a similar economic effect (e.g., taking a short position in a futures contract). The Portfolio will incur a loss as a result of a short position if the price of the asset sold short increases between the date of the short position sale and the date on which an offsetting position is purchased. Short positions may be considered speculative transactions and involve special risks that could cause or increase losses or reduce gains, including greater reliance on the investment adviser’s ability to accurately anticipate the future value of a security or instrument, potentially higher transaction costs, and imperfect correlation between the actual and desired level of exposure. Because the Portfolio’s potential loss on a short position arises from increases in the value of the asset sold short, the extent of such loss, like the price of the asset sold short, is theoretically unlimited. By investing the proceeds received from selling securities short, the Portfolio could be deemed to be employing a form of leverage, in that it amplifies changes in the Portfolio’s net asset value because it increases the Portfolio’s exposure to the market and may increase losses and the volatility of returns.
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 changes in the Portfolio’s average annual total returns for the past one, five, and ten years (or since inception) through December 31, 2019 compared to the returns of a broad-based securities market index. The additional index shows how the Portfolio’s performance compared with the returns of a volatility-managed 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.

As of the close of business on April 13, 2015, Class IA shares ceased operations and are not currently offered.

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 changes in the Portfolio’s average annual total returns for the past one, five, and ten years (or since inception) through December 31, 2019 compared to the returns of a broad-based securities market index.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The additional index shows how the Portfolio’s performance compared with the returns of a volatility-managed 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)
12.96% (2019 1st Quarter)      –15.38% (2011 3rd Quarter)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns
EQ/500 Managed Volatility Portfolio | Class IA Shares  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther
Management Fee rr_ManagementFeesOverAssets 0.41% [1]
Distribution and/or Service Fees (12b-1 fees) rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.14% [2]
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.80%
1 Year rr_ExpenseExampleYear01 $ 82
3 Years rr_ExpenseExampleYear03 255
5 Years rr_ExpenseExampleYear05 444
10 Years rr_ExpenseExampleYear10 990
1 Year rr_ExpenseExampleNoRedemptionYear01 82
3 Years rr_ExpenseExampleNoRedemptionYear03 255
5 Years rr_ExpenseExampleNoRedemptionYear05 444
10 Years rr_ExpenseExampleNoRedemptionYear10 990
EQ/500 Managed Volatility Portfolio | Class IB Shares  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther
Management Fee rr_ManagementFeesOverAssets 0.41% [1]
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 0.80%
1 Year rr_ExpenseExampleYear01 $ 82
3 Years rr_ExpenseExampleYear03 255
5 Years rr_ExpenseExampleYear05 444
10 Years rr_ExpenseExampleYear10 990
1 Year rr_ExpenseExampleNoRedemptionYear01 82
3 Years rr_ExpenseExampleNoRedemptionYear03 255
5 Years rr_ExpenseExampleNoRedemptionYear05 444
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 990
2010 rr_AnnualReturn2010 12.97%
2011 rr_AnnualReturn2011 (3.77%)
2012 rr_AnnualReturn2012 14.82%
2013 rr_AnnualReturn2013 31.00%
2014 rr_AnnualReturn2014 12.53%
2015 rr_AnnualReturn2015 0.37%
2016 rr_AnnualReturn2016 11.04%
2017 rr_AnnualReturn2017 20.75%
2018 rr_AnnualReturn2018 (6.04%)
2019 rr_AnnualReturn2019 29.88%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 12.96%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (15.38%)
One Year rr_AverageAnnualReturnYear01 29.88%
Five Years rr_AverageAnnualReturnYear05 10.43%
Ten Years rr_AverageAnnualReturnYear10 11.69%
EQ/500 Managed Volatility Portfolio | Class K Shares  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther
Management Fee rr_ManagementFeesOverAssets 0.41% [1]
Distribution and/or Service Fees (12b-1 fees) rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.14%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.55%
1 Year rr_ExpenseExampleYear01 $ 56
3 Years rr_ExpenseExampleYear03 176
5 Years rr_ExpenseExampleYear05 307
10 Years rr_ExpenseExampleYear10 689
1 Year rr_ExpenseExampleNoRedemptionYear01 56
3 Years rr_ExpenseExampleNoRedemptionYear03 176
5 Years rr_ExpenseExampleNoRedemptionYear05 307
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 689
One Year rr_AverageAnnualReturnYear01 30.23%
Five Years rr_AverageAnnualReturnYear05 10.71%
Since Inception rr_AverageAnnualReturnSinceInception 13.88%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 26, 2011
EQ/500 Managed Volatility Portfolio | Volatility Managed Index – Large Cap Core (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 30.66%
Five Years rr_AverageAnnualReturnYear05 11.31%
Ten Years rr_AverageAnnualReturnYear10 13.03%
EQ/500 Managed Volatility Portfolio | S&P 500® Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 31.49%
Five Years rr_AverageAnnualReturnYear05 11.70%
Ten Years rr_AverageAnnualReturnYear10 13.56%
[1] Management Fee has been restated to reflect the current fee.
[2] Based on estimated amounts for the current fiscal year.