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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName EQ ADVISORS TRUST
Prospectus Date rr_ProspectusDate May 01, 2020
EQ/Fidelity Institutional AM Large Cap Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading EQ/Fidelity Institutional AM® Large Cap Portfolio – Class IB and K Shares
Objective [Heading] rr_ObjectiveHeading Investment Objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock Seeks to achieve long-term capital appreciation.
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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination April 30, 2021
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 72% of the average value of the Portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 72.00%
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Expenses have been restated to reflect current fees.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Portfolio with the cost of investing in other portfolios. The Example assumes that you invest $10,000 in the Portfolio for the periods indicated, that your investment has a 5% return each year, that the Portfolio’s operating expenses remain the same, and that the Expense Limitation Arrangement is not renewed. This Example does not reflect any Contract-related fees and expenses including redemption fees (if any) at the Contract level. If such fees and expenses were reflected, the total expenses would be higher. Although your actual costs may be higher or lower, based on these assumptions, whether you redeem or hold your shares, your costs would be:
Strategy [Heading] rr_StrategyHeading INVESTMENTS, RISKS, AND PERFORMANCE Principal Investment Strategy:
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock Under normal circumstances, the Portfolio invests at least 80% of its net assets, plus any borrowings for investment purposes, in securities of large-cap companies (or other financial instruments that derive their value from the securities of such companies). For purposes of this Portfolio, large-cap companies are those companies with public stock market capitalizations within the range of companies constituting the Standard & Poor’s 500® Composite Stock Index (“S&P 500® Index”) at the time of investment. As of December 31, 2019, the market capitalizations of the companies in the S&P 500® Index ranged from approximately $4.6 billion to $1,305 billion. The size of companies in the index changes with market conditions, which can result in changes to the market capitalization range of companies in the index.

The Sub-Adviser invests the Portfolio’s assets in securities of companies whose value it believes is not fully recognized by the public. The types of companies in which the Portfolio may invest include companies experiencing positive fundamental change, such as a new management team or product launch, a significant cost-cutting initiative, a merger or acquisition, or a reduction in industry capacity that should lead to improved pricing; companies whose earnings potential has increased or is expected to increase more than generally perceived; companies that have enjoyed recent market popularity but which appear to have fallen temporarily out of favor for reasons that are considered non-recurring or short-term; and companies that are undervalued in relation to securities of other companies in the same industry. The Sub-Adviser normally invests the Portfolio’s assets primarily in common stocks. The Sub-Adviser may invest the Portfolio’s assets in securities of foreign issuers in addition to securities of domestic issuers.

The Sub-Adviser allocates the Portfolio’s assets across different market sectors, using different portfolio managers to handle investments within each sector. At present, these sectors include consumer discretionary, consumer staples, energy, financials, health care, industrials, information technology, materials, real estate, communication services, and utilities. The Sub-Adviser expects the Portfolio’s sector allocations will approximate the sector weightings of the S&P 500® Index, a broadly diversified measure of the performance of 500 common stocks chosen for market size, liquidity, and industry group representation to represent U.S. equity performance. While the Sub-Adviser may overweight or underweight one or more sectors from time to time, the Sub-Adviser expects the Portfolio’s returns to be driven primarily by the security selections of the portfolio managers of each sector.

The Sub-Adviser is not constrained by any particular investment style. At any given time, the Sub-Adviser may tend to buy “growth” stocks or “value” stocks, or a combination of both types. In buying and selling securities for the Portfolio, the Sub-Adviser relies on fundamental analysis, which involves a bottom-up assessment of a company’s potential for success in light of factors including its financial condition, earnings outlook, strategy, management, industry position, and economic and market conditions.

The Sub-Adviser may also use various techniques, such as buying and selling futures contracts and exchange traded funds, to increase or decrease the Portfolio’s exposure to changing security prices or other factors that affect security values.

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.

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.

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.

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.

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.

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 or political developments. Events and evolving conditions in certain economies or markets may alter the risks associated with investments tied to countries or regions that historically were perceived as comparatively stable and make such investments riskier and more volatile. Regardless of where a company is organized or its stock is traded, its performance may be significantly affected by events in regions from which it derives its profits or in which it conducts significant operations.
Currency Risk:  Investments that are denominated in or that provide exposure to foreign currencies are subject to the risk that those currencies will decline in value relative to the U.S. dollar. Any such decline may erode or reverse any potential gains from an investment in securities denominated in foreign currency or may widen existing loss. In the case of hedging positions, there is the risk that the U.S. dollar will decline in value relative to the currency being hedged. Currency rates may fluctuate significantly over short periods of time.

European Economic Risk: The economies of European Union (“EU”) member countries and their trading partners, as well as the broader global economy, may be adversely affected by changes in the euro’s exchange rate, changes in EU or governmental regulations on trade, and the threat of default or an actual default by an EU member country on its sovereign debt, which could negatively impact the Portfolio’s investments and cause it to lose money. The United Kingdom (“UK”) left the EU on January 31, 2020, commonly referred to as “Brexit.” The effect on the UK’s economy will likely depend on the nature of trade relations with the EU following its exit, a matter that is being negotiated. There is significant market uncertainty regarding Brexit’s ramifications, and the range and potential implications of possible political, regulatory, economic, and market outcomes cannot be fully known. The negative impact on not only the UK and European economies but also the broader global economy could be significant, potentially resulting in increased volatility and illiquidity, which could adversely affect the value of the Portfolio’s investments. Any further withdrawals from the EU could cause additional market disruption globally.

Geographic Concentration Risk: To the extent the Portfolio invests a significant portion of its assets in securities of companies domiciled, or exercising the predominant part of their economic activity, in one country or geographic region, it assumes the risk that economic, political, social and environmental conditions in that particular country or region will have a significant impact on the Portfolio’s investment performance and that the Portfolio’s performance will be more volatile than the performance of more geographically diversified funds.
Investment Style Risk: The Portfolio may use a particular style or set of styles — in this case, both “growth” and “value” styles — to select investments. Those styles may be out of favor or may not produce the best results over short or longer time periods. Growth stocks may be more sensitive to changes in current or expected earnings than the prices of other stocks. Growth investing also is subject to the risk that the stock price of one or more companies will fall or will fail to appreciate as anticipated by the Portfolio, regardless of movements in the securities market. Growth stocks also tend to be more volatile than value stocks, so in a declining market their prices may decrease more than value stocks in general. Growth stocks also may increase the volatility of the Portfolio’s share price. Value stocks are subject to the risks that, notwithstanding that a stock is selling at a discount to its perceived true worth, the stock’s intrinsic value may never be fully recognized or realized by the market, or its price may go down. In addition, there is the risk that a stock judged to be undervalued may actually have been appropriately priced at the time of investment.

New Portfolio Risk: The Portfolio is newly or recently established and has limited operating history. The Portfolio may not be successful in implementing its investment strategy, and there can be no assurance that the Portfolio will grow to or maintain an economically viable size, which could result in the Portfolio being liquidated at any time without shareholder approval and at a time that may not be favorable for all shareholders.

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 below shows the Portfolio’s first calendar year of performance. The table below provides some indication of the risks of investing in the Portfolio by showing how the Portfolio’s average annual total returns for the past one-year and since inception periods through December 31, 2019 compared to the returns of a broad-based securities market index. 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 below shows the Portfolio’s first calendar year of performance. The table below provides some indication of the risks of investing in the Portfolio by showing how the Portfolio’s average annual total returns for the past one-year and since inception periods 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 Return — Class IB
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best quarter (% and time period)      Worst quarter (% and time period)
13.91% (2019 1st Quarter)      0.56% (2019 3rd Quarter)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns
EQ/Fidelity Institutional AM Large Cap Portfolio | Class IB Shares  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther
Management Fee rr_ManagementFeesOverAssets 0.54%
Distribution and/or Service Fees (12b-1 fees) rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.13% [1]
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.92%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%) [2]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.87%
1 Year rr_ExpenseExampleYear01 $ 89
3 Years rr_ExpenseExampleYear03 288
5 Years rr_ExpenseExampleYear05 504
10 Years rr_ExpenseExampleYear10 1,127
1 Year rr_ExpenseExampleNoRedemptionYear01 89
3 Years rr_ExpenseExampleNoRedemptionYear03 288
5 Years rr_ExpenseExampleNoRedemptionYear05 504
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,127
2019 rr_AnnualReturn2019 31.09%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 13.91%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2019
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn 0.56%
One Year rr_AverageAnnualReturnYear01 31.09%
Since Inception rr_AverageAnnualReturnSinceInception 13.38%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 22, 2018
EQ/Fidelity Institutional AM Large Cap Portfolio | Class K Shares  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther
Management Fee rr_ManagementFeesOverAssets 0.54%
Distribution and/or Service Fees (12b-1 fees) rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.13% [1]
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.67%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%) [2]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.62%
1 Year rr_ExpenseExampleYear01 $ 63
3 Years rr_ExpenseExampleYear03 209
5 Years rr_ExpenseExampleYear05 368
10 Years rr_ExpenseExampleYear10 830
1 Year rr_ExpenseExampleNoRedemptionYear01 63
3 Years rr_ExpenseExampleNoRedemptionYear03 209
5 Years rr_ExpenseExampleNoRedemptionYear05 368
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 830
One Year rr_AverageAnnualReturnYear01 31.41%
Since Inception rr_AverageAnnualReturnSinceInception 13.66%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 22, 2018
EQ/Fidelity Institutional AM Large Cap Portfolio | S&P 500® Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 31.49%
Since Inception rr_AverageAnnualReturnSinceInception 16.09%
[1] Expenses have been restated to reflect current fees.
[2] Pursuant to a contract, AXA Equitable Funds Management Group, LLC (the “Adviser”) has agreed to make payments or waive its management, administrative and other fees to limit the expenses of the Portfolio through April 30, 2021 (unless the Board of Trustees consents to an earlier revision or termination of this arrangement) (“Expense Limitation Arrangement”) so that the annual operating expenses (including Acquired Fund Fees and Expenses) of the Portfolio (exclusive of taxes, interest, brokerage commissions, dividend and interest expenses on securities sold short, capitalized expenses, and extraordinary expenses not incurred in the ordinary course of the Portfolio’s business) do not exceed an annual rate of average daily net assets of 0.87% for Class IB shares and 0.62% for Class K shares of the Portfolio. The Expense Limitation Arrangement may be terminated by the Adviser at any time after April 30, 2021. The Adviser may be reimbursed the amount of any such payments or waivers in the future provided that the payments or waivers are reimbursed within three years of the payments or waivers being recorded and the Portfolio’s expense ratio, after the reimbursement is taken into account, does not exceed the Portfolio’s expense cap at the time of the waiver or the Portfolio’s expense cap at the time of the reimbursement, whichever is lower.