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PC Shares | AB All Market Real Return Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading AB All Market Real Return Portfolio
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Fund’s investment objective is to maximize real return over inflation.
Expense [Heading] rr_ExpenseHeading FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund 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 January 31, 2024
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys or sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Fund Operating Expenses or in the Examples, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 79% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 79.00%
Expense Example [Heading] rr_ExpenseExampleHeading Examples
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
The Examples are intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Fund for the time periods indicated. The Examples also assume that your investment has a 5% return each year, that the Fund’s operating expenses stay the same and that any fee waiver and/or expense limitation is in effect for only the first year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
 
Strategy [Heading] rr_StrategyHeading PRINCIPAL STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund seeks to maximize real return. Real return is the rate of return after adjusting for inflation.
The Fund pursues an aggressive investment strategy involving a variety of asset classes. The Fund invests primarily in instruments that the Adviser expects to outperform broad equity indices during periods of rising inflation. Under normal circumstances, the
  
Fund expects to invest its assets principally in the following instruments that, in the judgment of the Adviser, are affected directly or indirectly by the level and change in rate of inflation: inflation-indexed fixed-income securities, such as Treasury Inflation-Protected Securities (“TIPS”) and similar bonds issued by governments outside of the United States; commodities; commodity-related equity securities; real estate equity securities; inflation sensitive equity securities, which the Fund defines as equity securities of companies that the Adviser believes have the ability to pass along increasing costs to consumers and maintain or grow margins in rising inflation environments, including equity securities of utilities and infrastructure-related companies (“inflation sensitive equities”); securities and derivatives linked to the price of other assets (such as commodities, stock indices and real estate); and currencies. The Fund expects its investments in fixed-income securities to have a broad range of maturities and quality levels. 
The Fund seeks inflation protection from investments around the globe, both in developed and emerging market countries. In selecting securities for purchase and sale, the Adviser utilizes its qualitative and quantitative resources to determine overall inflation sensitivity, asset allocation, and security selection. The Adviser assesses the securities’ risks and inflation sensitivity as well as the securities’ impact on the overall risks and inflation sensitivity of the Fund. When its analysis indicates that changes are necessary, the Adviser intends to implement them through a combination of changes to underlying positions and the use of inflation swaps and other types of derivatives, such as interest rate swaps. 
The Fund anticipates that its targeted investment mix, other than its investments in inflation-indexed fixed-income securities, will focus on commodity-related equity securities, commodities and commodity derivatives, real estate equity securities and inflation sensitive equities to provide a balance between expected return and inflation protection. The Fund may vary its investment allocations among these asset classes, at times significantly. Its commodities investments will include significant exposure to energy commodities, but will also include agricultural products, and industrial and precious metals, such as gold. The Fund’s investments in real estate equity securities will include real estate investment trusts (“REITs”) and other real estate-related securities. 
The Fund invests in both U.S. and non‑U.S. Dollar‑denominated equity or fixed-income securities. The Fund may invest in currencies for hedging or for investment purposes, both in the spot market and through long or short positions in currency-related derivatives. The Fund does not ordinarily expect to hedge its foreign currency exposure because it will be balanced by investments in U.S. Dollar-denominated securities, although it may hedge the exposure under certain circumstances. 
The Fund may enter into derivatives, such as options, futures contracts, forwards, swaps or structured notes, to a significant extent, subject to the limits of applicable law. The Fund intends to use leverage for investment purposes through the use of cash made available by derivatives transactions to make other investments in accordance with its investment policies. In determining when and to what extent to employ leverage or enter into derivatives transactions, the Adviser considers factors such as the relative risks and returns expected of potential investments and the cost of such transactions. The Adviser considers the impact of derivatives in making its assessments of the Fund’s risks. The resulting exposures to markets, sectors, issuers or specific securities will be continuously monitored by the Adviser. 
The Fund may seek to gain exposure to physical commodities traded in the commodities markets through use of a variety of derivative instruments, including investments in commodity index-linked notes. The Adviser expects that the Fund will seek to gain exposure to commodities and commodity-related instruments and derivatives primarily through investments in AllianceBernstein Cayman Inflation Strategy, Ltd., a wholly-owned subsidiary of the Fund organized under the laws of the Cayman Islands (the “Subsidiary”). The Subsidiary is advised by the Adviser and has the same investment objective and substantially similar investment policies and restrictions as the Fund except that the Subsidiary, unlike the Fund, may invest, without limitation, in commodities and commodity-related instruments. The Fund is subject to the risks associated with the commodities, derivatives and other instruments in which the Subsidiary invests, to the extent of its investment in the Subsidiary. The Fund limits its investment in the Subsidiary to no more than 25% of its net assets. Investment in the Subsidiary is expected to provide the Fund with commodity exposure within the limitations of federal tax requirements that apply to the Fund. 
The Fund is “non‑diversified”, which means that it may concentrate its assets in a smaller number of issuers than a diversified fund. 
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
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Market Risk: The value of the Fund’s assets will fluctuate as the stock, commodity and bond markets fluctuate. The value of the Fund’s investments may decline, sometimes rapidly and unpredictably, simply because of economic changes or other events, including public health crises (including the occurrence of a contagious disease or illness) and regional and global conflicts, that affect large portions of the market. 
•  
Credit Risk: An issuer or guarantor of a fixed-income security, or the counterparty to a derivatives or other contract, may be unable or unwilling to make timely payments of interest or principal, or to otherwise honor its obligations. The issuer or guarantor may default, causing a loss of the full principal amount of a security and accrued interest. The degree of risk for a particular security may be reflected in its credit rating. There is the possibility that the credit rating of a fixed-income security may be downgraded after purchase, which may adversely affect the value of the security. Investments in fixed-income securities with lower ratings tend to have a higher probability that an issuer will default or fail to meet its payment obligations. 
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Interest Rate Risk: Changes in interest rates will affect the value of investments in fixed-income securities. When interest rates rise, the value of existing investments in fixed-income securities tends to fall and this decrease in value may not be offset by higher income from new investments. Interest rate risk is generally greater for fixed-income securities with longer maturities or durations. The Fund may be subject to a greater risk of rising interest rates than would normally be the case due to the recent end of a period of historically low rates and the effect of potential central bank monetary policy, and government fiscal policy, initiatives and resulting market reactions to those initiatives. 
•  
Commodity Risk: Investing in commodities and commodity-linked derivative instruments, either directly or through the Subsidiary, may subject the Fund to greater volatility than investments in traditional securities. The value of commodity-linked derivative instruments may be affected by changes in overall market movements, commodity index volatility, changes in interest rates, or factors affecting a particular industry or commodity, such as drought, floods, weather, livestock disease, embargoes, tariffs and international economic, political and regulatory developments. 
•  
Derivatives Risk: Derivatives may be difficult to price or unwind and leveraged so that small changes may produce disproportionate losses for the Fund. A short position in a derivative instrument involves the risk of a theoretically unlimited increase in the value of the underlying asset, which could cause the Fund to suffer a potentially unlimited loss. Derivatives, especially over‑the‑counter derivatives, are also subject to counterparty risk, which is the risk that the counterparty (the party on the other side of the transaction) on a derivative transaction will be unable or unwilling to honor its contractual obligations to the Fund. 
•  
Leverage Risk: To the extent the Fund uses leveraging techniques, its net asset value (“NAV”) may be more volatile because leverage tends to exaggerate the effect of changes in interest rates and any increase or decrease in the value of the Fund’s investments. 
•  
Inflation Risk: This is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the Fund’s assets can decline as can the value of the Fund’s distributions. This risk is significantly greater for fixed-income securities with longer maturities. 
•  
Illiquid Investments Risk: Illiquid investments risk exists when certain investments are or become difficult to purchase or sell. Difficulty in selling such investments may result in sales at disadvantageous prices affecting the value of your investment in the Fund. Causes of illiquid investments risk may include low trading volumes and large positions. Foreign fixed-income securities may have more illiquid investments risk because secondary trading markets for these securities may be smaller and less well-developed and the securities may trade less frequently. Illiquid investments risk may be higher in a rising interest rate environment, when the value and liquidity of fixed-income securities generally go down. 
•  
Foreign (Non‑U.S.) Risk: Investments in securities of non‑U.S. issuers may involve more risk than those of U.S. issuers. These securities may fluctuate more widely in price and may be more difficult to trade due to adverse market, economic, political, regulatory or other factors. 
•  
Currency Risk: Fluctuations in currency exchange rates may negatively affect the value of the Fund’s investments or reduce its returns. 
•  
Subsidiary Risk: By investing in the Subsidiary, the Fund is indirectly exposed to the risks associated with the Subsidiary’s investments. The derivatives and other investments held by the Subsidiary are generally similar to those that are permitted to be held by the Fund and are subject to the same risks that apply to similar investments if held directly by the Fund. The Subsidiary is not registered under the Investment Company Act of 1940, as amended (the “1940 Act”), and, unless otherwise noted in this Prospectus, is not subject to all of the investor protections of the 1940 Act. However, the Fund wholly owns and controls the Subsidiary, and the Fund and the Subsidiary are managed by the Adviser, making it unlikely the Subsidiary will take actions contrary to the interests of the Fund or its shareholders. 
•  
Real Estate Risk: The Fund’s investments in real estate securities have many of the same risks as direct ownership of real estate, including the risk that the value of real estate could decline due to a variety of factors that affect the real estate market generally. Investments in REITs may have additional risks. REITs are dependent on the capability of their managers, may have limited diversification, and could be significantly affected by changes in taxes. 
•  
Non‑Diversification Risk: The Fund may have more risk because it is “non‑diversified”, meaning that it can invest more of its assets in a smaller number of issuers. Accordingly, changes in the value of a single security may have a more significant effect, either negative or positive, on the Fund’s NAV.
•  
Management Risk: The Fund is subject to management risk because it is an actively-managed investment fund. The Adviser will apply its investment techniques and risk analyses in making investment decisions, but there is no guarantee that its techniques will produce the intended results. Some of these techniques may incorporate, or rely upon, quantitative models, but there is no guarantee that these models will generate accurate forecasts, reduce risk or otherwise perform as expected. 
As with all investments, you may lose money by investing in the Fund.
Risk Lose Money [Text] rr_RiskLoseMoney As with all investments, you may lose money by investing in the Fund.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus Non‑Diversification Risk: The Fund may have more risk because it is “non‑diversified”, meaning that it can invest more of its assets in a smaller number of issuers. Accordingly, changes in the value of a single security may have a more significant effect, either negative or positive, on the Fund’s NAV.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading BAR CHART AND PERFORMANCE INFORMATION
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and performance information provide an indication of the historical risk of an investment in the Fund by showing:
  
•  
how the Fund’s performance changed from year to year over ten years; and
•  
how the Fund’s average annual returns for one, five and ten years compare to those of a broad-based securities market index.
You can obtain updated performance information for the Fund at www.bernstein.com (click on “Investments,” then “Mutual Fund Performance at a Glance”). 
The Fund’s past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns how the Fund’s performance changed from year to year over ten years; andhow the Fund’s average annual returns for one, five and ten years compare to those of a broad-based securities market index.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The information for the Bloomberg Commodity Index and Bloomberg 10+ Year U.S. TIPS Index is presented to show how the Fund’s performance compares with the returns of an index of securities similar to those in which the Fund invests.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.bernstein.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Bar Chart
Bar Chart Narrative [Text Block] rr_BarChartNarrativeTextBlock
The annual returns in the bar chart are for the Fund’s Class 1 shares.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Calendar Year End (%) During the period shown in the bar chart, the Fund’s: Best Quarter was up 14.00%, 2nd quarter, 2020; and Worst Quarter was down -25.66%, 1st quarter, 2020.
Performance Table Heading rr_PerformanceTableHeading Performance Table Average Annual Total Returns (For the periods ended December 31, 2022)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After‑tax returns:–Are an estimate, which is based on the highest historical individual federal marginal income tax rates, and do not reflect the impact of state and local taxes;
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred actual after‑tax returns depend on an individual investor’s tax situation and are likely to differ from those shown; and–Are not relevant to investors who hold fund shares through tax‑deferred arrangements such as 401(k) plans or individual retirement accounts.
PC Shares | AB All Market Real Return Portfolio | Class 1  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther none
Management Fees rr_ManagementFeesOverAssets 0.75%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.02%
Other Expenses rr_Component3OtherExpensesOverAssets 0.08%
Total Other Expenses rr_OtherExpensesOverAssets 0.10%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.03%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.13%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.11%
After 1 Year rr_ExpenseExampleYear01 $ 113
After 3 Years rr_ExpenseExampleYear03 357
After 5 Years rr_ExpenseExampleYear05 620
After 10 Years rr_ExpenseExampleYear10 $ 1,373
2013 rr_AnnualReturn2013 (1.38%)
2014 rr_AnnualReturn2014 (12.19%)
2015 rr_AnnualReturn2015 (19.56%)
2016 rr_AnnualReturn2016 15.69%
2017 rr_AnnualReturn2017 11.25%
2018 rr_AnnualReturn2018 (12.45%)
2019 rr_AnnualReturn2019 15.69%
2020 rr_AnnualReturn2020 0.33%
2021 rr_AnnualReturn2021 26.35%
2022 rr_AnnualReturn2022 (4.51%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 14.00%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (25.66%)
1 Year rr_AverageAnnualReturnYear01 (4.51%) [2]
5 Years rr_AverageAnnualReturnYear05 4.16% [2]
10 Years rr_AverageAnnualReturnYear10 0.95% [2]
PC Shares | AB All Market Real Return Portfolio | Return After Taxes on Distributions | Class 1  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (7.50%) [2],[3]
5 Years rr_AverageAnnualReturnYear05 2.58% [2],[3]
10 Years rr_AverageAnnualReturnYear10 (0.20%) [2],[3]
PC Shares | AB All Market Real Return Portfolio | Return After Taxes on Distributions and Sale of Fund Shares | Class 1  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (2.65%) [2],[3]
5 Years rr_AverageAnnualReturnYear05 2.79% [2],[3]
10 Years rr_AverageAnnualReturnYear10 0.38% [2],[3]
PC Shares | AB All Market Real Return Portfolio | MSCI All Country World Commodity Producers Index (reflects no deduction for fees, taxes or expenses)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 21.08%
5 Years rr_AverageAnnualReturnYear05 6.30%
10 Years rr_AverageAnnualReturnYear10 2.94%
PC Shares | AB All Market Real Return Portfolio | Bloomberg Commodity Index (reflects no deduction for fees, taxes or expenses)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 16.09% [4]
5 Years rr_AverageAnnualReturnYear05 6.44% [4]
10 Years rr_AverageAnnualReturnYear10 (1.28%) [4]
PC Shares | AB All Market Real Return Portfolio | Bloomberg 10+ year U.S. TIPS Index (reflects no deduction for fees, taxes or expenses)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (31.94%) [4]
5 Years rr_AverageAnnualReturnYear05 0.19% [4]
10 Years rr_AverageAnnualReturnYear10 0.40% [4]
[1]
In connection with the Fund’s investments in AB Government Money Market Portfolio (the “Money Market Portfolio”) (except for the investment of any cash collateral from securities lending), the Adviser has contractually agreed to waive its management fee from the Fund and/or reimburse other expenses of the Fund in an amount equal to the Fund’s pro rata share of the Money Market Portfolio’s effective management fee, as included in “Acquired Fund Fees and Expenses”. The agreement will remain in effect until January 31, 2024 and may only be terminated or changed with the consent of the Fund’s Board of Directors. In addition, the agreement will be automatically extended for one‑year terms unless the Adviser provides notice of termination to the Fund at least 60 days prior to the end of the period.
[2] After-tax returns: – Are an estimate, which is based on the highest historical individual federal marginal income tax rates, and do not reflect the impact of state and local taxes; actual after-tax returns depend on an individual investor’s tax situation and are likely to differ from those shown; and – Are not relevant to investors who hold fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
[3] After‑tax returns are based on information available to the Fund as of the date of this Prospectus.
[4]
The information for the Bloomberg Commodity Index and Bloomberg 10+ Year U.S. TIPS Index is presented to show how the Fund’s performance compares with the returns of an index of securities similar to those in which the Fund invests.