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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName EQ ADVISORS TRUST
Prospectus Date rr_ProspectusDate May 01, 2020
EQ/Equity 500 Index Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading EQ/Equity 500 Index Portfolio – Class IA, IB and K Shares
Objective [Heading] rr_ObjectiveHeading Investment Objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock Seeks to achieve a total return before expenses that approximates the total return performance of the Standard & Poor’s 500® Composite Stock Index (“S&P 500 Index”), including reinvestment of dividends, at a risk level consistent with that of the S&P 500 Index.
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 the Portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 4.00%
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 invests at least 80% of its net assets, plus borrowings for investment purposes, in equity securities in the S&P 500 Index. For purposes of the Portfolio, equity securities in the S&P 500 Index may include financial instruments that derive their value from such securities.

The Sub-Adviser does not utilize customary economic, financial or market analyses or other traditional investment techniques to manage the Portfolio. The Portfolio has been constructed and is maintained by utilizing a replication construction technique. That is, the Portfolio will seek to hold all 500 securities in the S&P 500 Index in the exact weight each represents in that Index. This strategy is commonly referred to as an indexing strategy. The Portfolio will remain substantially fully invested in securities comprising the index even when prices are generally falling. Similarly, adverse performance of a stock will ordinarily not result in its elimination from the Portfolio. The Portfolio will concentrate its investments (i.e., invest 25% or more of its total assets) in securities of issuers in a particular industry or group of industries to approximately the same extent that the S&P 500 Index is concentrated.

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 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.

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.

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.
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, 2019 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.
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, 2019 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)
13.44% (2019 1st Quarter)      –13.99% (2011 3rd Quarter)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns
EQ/Equity 500 Index Portfolio | Class IA Shares  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther
Management Fee rr_ManagementFeesOverAssets 0.22%
Distribution and/or Service Fees (12b-1 fees) rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.11%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.58%
1 Year rr_ExpenseExampleYear01 $ 59
3 Years rr_ExpenseExampleYear03 186
5 Years rr_ExpenseExampleYear05 324
10 Years rr_ExpenseExampleYear10 726
1 Year rr_ExpenseExampleNoRedemptionYear01 59
3 Years rr_ExpenseExampleNoRedemptionYear03 186
5 Years rr_ExpenseExampleNoRedemptionYear05 324
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 726
One Year rr_AverageAnnualReturnYear01 30.69%
Five Years rr_AverageAnnualReturnYear05 11.01%
Ten Years rr_AverageAnnualReturnYear10 12.91%
EQ/Equity 500 Index Portfolio | Class IB Shares  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther
Management Fee rr_ManagementFeesOverAssets 0.22%
Distribution and/or Service Fees (12b-1 fees) rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.11%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.58%
1 Year rr_ExpenseExampleYear01 $ 59
3 Years rr_ExpenseExampleYear03 186
5 Years rr_ExpenseExampleYear05 324
10 Years rr_ExpenseExampleYear10 726
1 Year rr_ExpenseExampleNoRedemptionYear01 59
3 Years rr_ExpenseExampleNoRedemptionYear03 186
5 Years rr_ExpenseExampleNoRedemptionYear05 324
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 726
2010 rr_AnnualReturn2010 14.39%
2011 rr_AnnualReturn2011 1.50%
2012 rr_AnnualReturn2012 15.26%
2013 rr_AnnualReturn2013 31.49%
2014 rr_AnnualReturn2014 12.98%
2015 rr_AnnualReturn2015 0.81%
2016 rr_AnnualReturn2016 11.22%
2017 rr_AnnualReturn2017 21.02%
2018 rr_AnnualReturn2018 (4.91%)
2019 rr_AnnualReturn2019 30.68%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 13.44%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (13.99%)
One Year rr_AverageAnnualReturnYear01 30.68%
Five Years rr_AverageAnnualReturnYear05 11.01%
Ten Years rr_AverageAnnualReturnYear10 12.86%
EQ/Equity 500 Index Portfolio | Class K Shares  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther
Management Fee rr_ManagementFeesOverAssets 0.22%
Distribution and/or Service Fees (12b-1 fees) rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.11%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.33%
1 Year rr_ExpenseExampleYear01 $ 34
3 Years rr_ExpenseExampleYear03 106
5 Years rr_ExpenseExampleYear05 185
10 Years rr_ExpenseExampleYear10 418
1 Year rr_ExpenseExampleNoRedemptionYear01 34
3 Years rr_ExpenseExampleNoRedemptionYear03 106
5 Years rr_ExpenseExampleNoRedemptionYear05 185
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 418
One Year rr_AverageAnnualReturnYear01 31.01%
Five Years rr_AverageAnnualReturnYear05 11.27%
Since Inception rr_AverageAnnualReturnSinceInception 15.01%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 26, 2011
EQ/Equity 500 Index 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%