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AB Select US Long/Short Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading AB Select US Long/Short Portfolio
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Fund’s investment objective is long-term growth of capital.
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. You may be required to pay commissions and/or other forms of compensation to a broker for transactions in Advisor Class shares, which are not reflected in the tables or the examples below. You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AB Mutual Funds. More information about these and other discounts is available from your financial intermediary and in Investing in the Funds—Sales Charge Reduction Programs for Class A Shares on page 74 of this Prospectus, in Appendix B—Financial Intermediary Waivers of this Prospectus and in Purchase of Shares—Sales Charge Reduction Programs for Class A Shares on page 133 of the Fund’s Statement of Additional Information (“SAI”).
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 October 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 382% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 382.00%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Purchases of Class A shares in amounts of $1,000,000 or more, or by certain group retirement plans, may be subject to a 1%, 1-year contingent deferred sales charge, or CDSC, which may be subject to waiver in certain circumstances.For Class C shares, the CDSC is 0% after the first year. Class C shares automatically convert to Class A shares after eight years.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AB Mutual Funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
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 and then redeem all of your shares at the end of those periods. 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 remains 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
Under normal circumstances, the Fund invests at least 80% of its net assets in equity securities of U.S. companies, short positions in such securities, and cash and U.S. cash equivalents.
The Adviser selects investments for the Fund’s long positions through an intensive “bottom-up” approach that places an emphasis on companies that are engaged in business activities with solid long-term growth potential and high barriers to entry, that have strong cash flows and other financial metrics, and that have transparent financial statements and business models. The Adviser also evaluates the quality of company management based on a series of criteria, including: (1) management’s focus on shareholder returns, such as through a demonstrated commitment to dividends and dividend growth, share buybacks or other shareholder-friendly corporate actions; (2) management’s employment of conservative accounting methodologies; (3) management incentives, such as direct equity ownership; and (4) management accessibility. The Adviser seeks to identify companies where events or catalysts may drive the company’s share price higher, such as earnings and/or revenue growth above consensus forecasts, potential market recognition of undervaluation or overstated market-risk discount, or the institution of any of the shareholder-friendly practices discussed in the preceding sentence. In light of this catalyst-focused approach, the Adviser expects to engage in active and frequent trading for the Fund.
The Adviser may reduce or eliminate the Fund’s holdings in a company’s securities for a number of reasons, including if its evaluation of the above factors changes adversely, if the anticipated events or catalysts do not occur or do not affect the price of the securities as expected, or if the anticipated events or catalysts do occur and cause the securities to be, in the Adviser’s view, overvalued or fully valued. At any given time the Fund may emphasize growth stocks over value stocks, or vice versa.
In determining securities to be sold short, the Adviser looks for companies facing near-term difficulties such as high valuations, quality of earnings issues, or weakness in demand due to economic factors or long-term issues such as changing technology or competitive concerns in their industries. The Fund may also sell securities of exchange-traded funds (“ETFs”) short, including to hedge its exposure to specific market sectors or if it believes a specific sector or asset will decline in value. When the Fund sells securities short, it sells a stock that it does not own (but has borrowed) at its current market price in anticipation that the price of the stock will decline. To complete, or close out, the short sale transaction, the Fund buys the same stock in the market at a later date and returns it to the lender.
The Adviser derives the ratio between long and short positions for the Fund based on its bottom-up analysis supplemented with macro-economic and market analyses. Under normal market conditions, the net long exposure of the Fund (long exposure minus short exposure) will range between 30% and 70%. The Adviser seeks to minimize the variability of Fund returns through industry diversification as well as by managing long and short exposures and/or by holding a material level of cash and/or cash equivalents. For example, the Fund may hold long positions in equity securities with a value equal to 60% of its net assets and have short sale obligations equal to 15% of its net assets, resulting in 45% net long exposure. Assuming a 60% long exposure, 40% of Fund assets will be held in cash or cash equivalents, including cash and cash equivalents held to cover the Fund’s short sale obligations. During periods of excessive market risk, the Adviser may reduce the net long exposure of the Fund. The Fund may at times hold long and short positions that in the aggregate exceed the value of its net assets (i.e., so that the Fund is effectively leveraged).
The Fund’s investments will be focused on securities of companies with large and medium market capitalizations, but it may also take long and short positions in securities of small-capitalization companies. The Fund may invest in non-U.S. companies, but currently intends to limit its investments in such companies to no more than 10% of its net assets. The Fund may purchase securities in initial public offerings (“IPOs”) and expects to do so on a regular basis.
The Fund may enter into derivatives transactions, such as options, futures contracts, forwards, and swaps, as part of its investment strategies or for hedging or other risk management purposes. These transactions may be used, for example, as a means to take a short position in a security or sector without actually selling securities short.
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS
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 may obtain updated performance information on the Fund’s website at www.abfunds.com (click on “Investments—Mutual Funds”).
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 Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.abfunds.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 A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown. Through September 30, 2023, the year-to-date unannualized return for Class A shares was 4.21%.
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The annual returns in the bar chart are for the Fund’s Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.
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 8.71%, 2nd quarter, 2020; and Worst Quarter was down -10.66%, 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.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns:–Are shown for Class A shares only and will vary for the other Classes of shares because these Classes have different expense ratios;
AB Select US Long/Short Portfolio | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
As with all investments, you may lose money by investing in the Fund.
AB Select US Long/Short Portfolio | Market Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
•
Market Risk: The value of the Fund’s assets will fluctuate as the market or markets in which the Fund invests 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. It includes the risk that a particular style of investing may be underperforming the market generally.
AB Select US Long/Short Portfolio | Capitalization Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
•
Capitalization Risk: Investments in small- and mid-capitalization companies may be more volatile than investments in large-capitalization companies. Investments in these companies may have additional risks because these companies may have limited product lines, markets or financial resources.
AB Select US Long/Short Portfolio | Active Trading Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
•
Active Trading Risk: The Fund expects to engage in active and frequent trading of its portfolio securities and its portfolio turnover rate is expected to greatly exceed 100%. A higher rate of portfolio turnover increases transaction costs, which may negatively affect the Fund’s return. In addition, a high rate of portfolio turnover may result in substantial short-term gains, which may have adverse tax consequences for Fund shareholders.
AB Select US Long/Short Portfolio | IPO Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
•
IPO Risk: Securities purchased in an IPO may be subject to substantial price volatility due to one or more factors such as unseasoned trading in the securities, the lack of investor knowledge of the issuer, the lack of an operating history of the issuer, and the dependence of the issuer on key personnel, suppliers or a limited number of customers.
AB Select US Long/Short Portfolio | Management Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
•
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 for the Fund, 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.
AB Select US Long/Short Portfolio | Short Sale Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
•
Short Sale Risk: Short sales involve the risk that the Fund will incur a loss by subsequently buying a security at a higher price than the price at which it sold the security. The amount of such loss is theoretically unlimited, as it will be based on the increase in value of the security sold short. In contrast, the risk of loss from a long position is limited to the Fund’s investment in the security, because the price of the security cannot fall below zero. The Fund may not always be able to close out a short position on favorable terms.
AB Select US Long/Short Portfolio | Derivatives Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
•
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, reference rate or index, 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.
AB Select US Long/Short Portfolio | Leverage Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
•
Leverage Risk: To the extent the Fund uses leveraging techniques, the value of its shares may be more volatile because leverage tends to exaggerate the effect of any increase or decrease in the value of the Fund’s investments.
AB Select US Long/Short Portfolio | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.25%
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther none [1]
Exchange Fee rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 1.50%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.08%
Dividend Expense, Borrowing Costs and Brokerage Expense on Securities Sold Short rr_Component2OtherExpensesOverAssets 0.07%
Other Expenses rr_Component3OtherExpensesOverAssets 0.05%
Total Other Expenses rr_OtherExpensesOverAssets 0.20%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.05%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.00%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.04%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.96%
After 1 Year rr_ExpenseExampleYear01 $ 616
After 3 Years rr_ExpenseExampleYear03 1,022
After 5 Years rr_ExpenseExampleYear05 1,453
After 10 Years rr_ExpenseExampleYear10 $ 2,650
2013 rr_AnnualReturn2013 20.55%
2014 rr_AnnualReturn2014 3.27%
2015 rr_AnnualReturn2015 (1.03%)
2016 rr_AnnualReturn2016 4.61%
2017 rr_AnnualReturn2017 12.26%
2018 rr_AnnualReturn2018 (1.89%)
2019 rr_AnnualReturn2019 16.89%
2020 rr_AnnualReturn2020 9.83%
2021 rr_AnnualReturn2021 17.39%
2022 rr_AnnualReturn2022 (10.16%)
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2023
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 4.21%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 8.71%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (10.66%)
1 Year rr_AverageAnnualReturnYear01 (14.00%) [3]
5 Years rr_AverageAnnualReturnYear05 4.93% [3]
10 Years rr_AverageAnnualReturnYear10 6.29% [3]
AB Select US Long/Short Portfolio | Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther 1.00% [4]
Exchange Fee rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 1.50%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.08%
Dividend Expense, Borrowing Costs and Brokerage Expense on Securities Sold Short rr_Component2OtherExpensesOverAssets 0.07%
Other Expenses rr_Component3OtherExpensesOverAssets 0.04%
Total Other Expenses rr_OtherExpensesOverAssets 0.19%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.05%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.74%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.04%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 2.70%
After 1 Year rr_ExpenseExampleYear01 $ 373 [5]
After 3 Years rr_ExpenseExampleYear03 846
After 5 Years rr_ExpenseExampleYear05 1,446
After 10 Years rr_ExpenseExampleYear10 $ 2,890
1 Year rr_AverageAnnualReturnYear01 (11.64%)
5 Years rr_AverageAnnualReturnYear05 5.06%
10 Years rr_AverageAnnualReturnYear10 5.97%
AB Select US Long/Short Portfolio | Advisor Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther none
Exchange Fee rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 1.50%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.08%
Dividend Expense, Borrowing Costs and Brokerage Expense on Securities Sold Short rr_Component2OtherExpensesOverAssets 0.07%
Other Expenses rr_Component3OtherExpensesOverAssets 0.05%
Total Other Expenses rr_OtherExpensesOverAssets 0.20%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.05%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.75%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.70%
After 1 Year rr_ExpenseExampleYear01 $ 173
After 3 Years rr_ExpenseExampleYear03 546
After 5 Years rr_ExpenseExampleYear05 944
After 10 Years rr_ExpenseExampleYear10 $ 2,058
1 Year rr_AverageAnnualReturnYear01 (9.87%)
5 Years rr_AverageAnnualReturnYear05 6.12%
10 Years rr_AverageAnnualReturnYear10 7.03%
AB Select US Long/Short Portfolio | Class R  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther none
Exchange Fee rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 1.50%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.24%
Dividend Expense, Borrowing Costs and Brokerage Expense on Securities Sold Short rr_Component2OtherExpensesOverAssets 0.07%
Other Expenses rr_Component3OtherExpensesOverAssets 0.05%
Total Other Expenses rr_OtherExpensesOverAssets 0.36%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.05%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.41%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.19%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 2.22%
After 1 Year rr_ExpenseExampleYear01 $ 225
After 3 Years rr_ExpenseExampleYear03 733
After 5 Years rr_ExpenseExampleYear05 1,268
After 10 Years rr_ExpenseExampleYear10 $ 2,732
1 Year rr_AverageAnnualReturnYear01 (10.33%)
5 Years rr_AverageAnnualReturnYear05 5.56%
10 Years rr_AverageAnnualReturnYear10 6.49%
AB Select US Long/Short Portfolio | Class K  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther none
Exchange Fee rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 1.50%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.17%
Dividend Expense, Borrowing Costs and Brokerage Expense on Securities Sold Short rr_Component2OtherExpensesOverAssets 0.07%
Other Expenses rr_Component3OtherExpensesOverAssets 0.04%
Total Other Expenses rr_OtherExpensesOverAssets 0.28%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.05%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.08%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.11%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.97%
After 1 Year rr_ExpenseExampleYear01 $ 200
After 3 Years rr_ExpenseExampleYear03 641
After 5 Years rr_ExpenseExampleYear05 1,109
After 10 Years rr_ExpenseExampleYear10 $ 2,402
1 Year rr_AverageAnnualReturnYear01 (9.93%)
5 Years rr_AverageAnnualReturnYear05 5.91%
10 Years rr_AverageAnnualReturnYear10 6.79%
AB Select US Long/Short Portfolio | Class I  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther none
Exchange Fee rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 1.50%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.02%
Dividend Expense, Borrowing Costs and Brokerage Expense on Securities Sold Short rr_Component2OtherExpensesOverAssets 0.07%
Other Expenses rr_Component3OtherExpensesOverAssets 0.06%
Total Other Expenses rr_OtherExpensesOverAssets 0.15%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.05%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.70%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.65%
After 1 Year rr_ExpenseExampleYear01 $ 168
After 3 Years rr_ExpenseExampleYear03 531
After 5 Years rr_ExpenseExampleYear05 918
After 10 Years rr_ExpenseExampleYear10 $ 2,004
1 Year rr_AverageAnnualReturnYear01 (9.90%)
5 Years rr_AverageAnnualReturnYear05 6.14%
10 Years rr_AverageAnnualReturnYear10 7.06%
AB Select US Long/Short Portfolio | Return After Taxes on Distributions | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (15.68%) [3]
5 Years rr_AverageAnnualReturnYear05 2.54% [3]
10 Years rr_AverageAnnualReturnYear10 4.50% [3]
AB Select US Long/Short Portfolio | Return After Taxes on Distributions and Sale of Fund Shares | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (7.75%) [3]
5 Years rr_AverageAnnualReturnYear05 3.04% [3]
10 Years rr_AverageAnnualReturnYear10 4.32% [3]
AB Select US Long/Short Portfolio | S&P 500® Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (18.11%)
5 Years rr_AverageAnnualReturnYear05 9.42%
10 Years rr_AverageAnnualReturnYear10 12.56%
[1]
Purchases of Class A shares in amounts of $1,000,000 or more, or by certain group retirement plans, may be subject to a 1%, 1-year contingent deferred sales charge, or CDSC, which may be subject to waiver in certain circumstances.
[2]
The Adviser has contractually agreed to waive its management fees and/or to bear certain expenses of the Fund until October 31, 2024 to the extent necessary to prevent total Fund operating expenses (excluding acquired fund fees and expenses, interest expense, taxes, extraordinary expenses, and brokerage commissions and other transaction costs), on an annualized basis, from exceeding 1.90%, 2.65%, 1.65%, 2.15%, 1.90% and 1.65% of average daily net assets, respectively, for Class A, Class C, Advisor Class, Class R, Class K and Class I shares. In addition, 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”. Each of the agreements will remain in effect until October 31, 2024 and may only be terminated or changed with the consent of the Fund’s Board of Directors. In addition, each of the agreements 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.
[3] After-tax returns: – Are shown for Class A shares only and will vary for the other Classes of shares because these Classes have different expense ratios; – 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.
[4]
For Class C shares, the CDSC is 0% after the first year. Class C shares automatically convert to Class A shares after eight years.
[5]
If you did not redeem your shares at the end of the period, your expenses would be decreased by approximately $100.