dei_EntityRegistrantName

EQ ADVISORS TRUST

rr_RiskReturnHeading

Multimanager Core Bond Portfolio — Class IB and Class K Shares

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

Seeks to achieve a balance of high current income and capital appreciation, consistent with a prudent level of risk.

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.

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, Rate

rr_PortfolioTurnoverRate

281.00%

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 Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal circumstances, the Portfolio intends to invest at least 80% of its net assets, plus borrowings for investment purposes, in investment grade bonds. For purposes of this investment policy, a debt security is considered a “bond.” Debt securities represent an issuer’s obligation to repay a loan of money that generally pays interest to the holder. Bonds, notes and debentures are examples of debt securities. The Portfolio may invest up to 20% of its net assets in non-investment grade securities (commonly known as “junk bonds”). The Adviser will generally allocate the Portfolio’s assets among four or more Sub-Advisers, each of which manages its portion of the Portfolio using different yet complementary investment strategies. Under normal circumstances, one portion of the Portfolio will track the performance of a particular index (“Index Allocated Portion”) and the other portions of the Portfolio will be actively managed (“Active Allocated Portions”). Under normal circumstances, the Adviser anticipates allocating approximately 25% of the Portfolio’s net assets to the Index Allocated Portion and the remaining 75% of the Portfolio’s net assets among the Active Allocated Portions. These percentages are targets established by the Adviser and actual allocations between the portions may deviate from these targets by up to 20% of the Portfolio’s net assets. The Index Allocated Portion seeks to track the performance (before fees and expenses and including reinvestment of coupon payments) of the Bloomberg U.S. Intermediate Government/Credit Bond Index (“Government/Credit Index”) with minimal tracking error. This strategy is commonly referred to as an indexing strategy. The Government/Credit Index covers U.S. dollar denominated, investment grade, fixed-rate securities, which include U.S. Treasury and government-related, corporate, credit and agency fixed-rate debt securities. Generally, the Index Allocated Portion uses a sampling technique. The Active Allocated Portions may invest in debt securities of U.S. and foreign issuers, including issuers located in emerging markets. The Active Allocated Portions’ investments may include government securities, corporate bonds, bonds of foreign issuers (including those denominated in foreign currencies or U.S. dollars), commercial and residential mortgage-backed securities, floating or variable rate obligations, 144A bonds, and asset-backed securities. The Active Allocated Portions also may purchase or sell securities on a when-issued, delayed delivery or forward commitment basis (including on a “TBA” (to be announced) basis). With TBA transactions, the particular securities to be delivered are not identified at the trade date, but the delivered securities must meet specified terms and standards (such as yield, duration, and credit quality). The Active Allocated Portions may use investment techniques such as “sale-buybacks” or “dollar rolls” to obtain market exposure to certain securities. In sale-buyback and dollar roll transactions, the Portfolio sells a security to another party and simultaneously agrees to repurchase the same security (in the case of a sale-buyback) or a similar, but not the same, security (in the case of a dollar roll) on a specified date and predetermined price. Foreign currency exposure (from non-U.S. dollar-denominated securities or currencies) normally will be limited to 10% of the Portfolio’s total assets. Non-investment grade securities include those securities rated Ba1 or lower by Moody’s Investors Service, Inc. or BB+ or lower by Fitch Ratings Ltd. or by Standard & Poor’s Global Ratings or, if unrated, deemed to be of comparable quality by the Adviser or a Sub-Adviser. The Active Allocated Portions may engage in active and frequent trading to achieve the Portfolio’s investment objective. Securities are purchased for the Active Allocated Portions when a Sub-Adviser determines that they have the potential for above-average total return. A Sub-Adviser may sell a security for a variety of reasons, such as to make other investments believed by the Sub-Adviser to offer superior investment opportunities. The Portfolio may invest in derivatives. It is anticipated that the Portfolio’s derivative instruments will consist primarily of forward contracts and exchange-traded futures and options contracts on individual securities or securities indices, but the Portfolio also may utilize other types of derivatives, including swaps. The Portfolio’s investments in derivatives may be deemed to 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 be deemed to involve the use of leverage because the heightened price sensitivity of some derivatives to market changes may magnify the Portfolio’s gain or loss. The Portfolio’s investments in derivatives may require it to maintain a percentage of its assets in cash and cash equivalent instruments to serve as margin or collateral for the Portfolio’s obligations under derivative transactions. The Portfolio may purchase bonds of any maturity, but generally the Portfolio’s overall effective duration will be of an intermediate-term nature (similar to that of three- to seven-year U.S. Treasury notes) and will generally have a comparable duration in the range of the Government/Credit Index (approximately 3.59 years as of December 31, 2024) and the Bloomberg U.S. Aggregate Bond Index (approximately 5.90 years as of December 31, 2024) as calculated by the Sub-Advisers. The Portfolio also may use derivative instruments such as futures and options to manage duration. Duration is a measure used to determine the sensitivity of a security’s price to changes in interest rates. The longer a security’s duration, the more sensitive it will be to changes in interest rates, which may increase the volatility of the security’s value and may lead to losses.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Risk/Return Bar Chart and Table

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, 2024, compared to the returns of a broad-based securities market index.

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Annual Total Returns — Class IB

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Best quarter (% and time period)6.20%2023 4th QuarterWorst quarter (% and time period)-5.53%2022 1st Quarter