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AB Small Cap Value Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading AB Small Cap Value Portfolio
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Fund’s investment objective is to seek 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 69 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 138 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 February 28, 2026
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 60% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 60.00%
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 these 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 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 invests primarily in a portfolio of equity securities of small-capitalization U.S. companies. Under normal circumstances, the Fund invests at least 80% of its net assets in equity securities of small-capitalization companies. For purposes of this policy, small-capitalization companies are those that, at the time of investment, fall within the capitalization range between the smallest company in the Russell 2000® Value Index and the greater of $2.5 billion or the largest company in the Russell 2000® Value Index. As of December 31, 2024, the market capitalization range of the Russell 2000® Value Index was between $8.3 million and $26.1 billion.
The Fund invests in companies that are determined by the Adviser to be undervalued, using the Adviser’s fundamental value approach. In selecting securities for the Fund, the Adviser uses its fundamental and quantitative research to identify companies whose long-term earnings power is not reflected in the current market price of the securities.
The Adviser looks for companies with attractive valuation and compelling quality factors (for example, momentum and return on equity). The Adviser then uses this information to calculate an expected return. Returns and rankings are updated on a daily basis. The rankings are used to determine prospective candidates for further fundamental research and, subsequently, possible addition to the Fund. Typically, the Adviser’s fundamental research analysts focus their research on the most attractive 20% of the companies in the small-capitalization universe as defined above.
The Adviser typically projects a company’s financial performance over a full economic cycle, including a trough and a peak, within the context of forecasts for real economic growth, inflation and interest rate changes. The Adviser focuses on the valuation implied by the current price, relative to the earnings the company is projected to generate five years from now, or “normalized” earnings, assuming average mid-economic cycle growth for the fifth year.
The Adviser generally sells a security when it no longer meets appropriate valuation criteria, although sales may be delayed when return trends are favorable. Typically, growth in the size of a company’s market capitalization relative to other domestically traded companies will not cause the Adviser to dispose of the security.
The Adviser seeks to manage the overall portfolio volatility relative to the Russell 2000® Value Index by favoring promising securities that offer the best balance between return and targeted risk.
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 and an additional index that more closely reflects the types of securities in which the Fund invests.
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 and an additional index that more closely reflects the types of securities in which the Fund invests.
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.
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 34.82%, 4th quarter, 2020; and Worst Quarter was down -37.58%, 1st quarter, 2020.
Performance Table Heading rr_PerformanceTableHeading Performance Table Average Annual Total Returns (For the periods ended December 31, 2024)
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective July 24, 2024, the primary broad-based index used for comparison with the Fund’s performance changed from the Russell 2000® Value Index to the S&P 500 Index to comply with new regulations that require the Fund’s primary benchmark to reflect the overall market in which the Fund may invest. The Fund’s previous primary benchmark, the Russell 2000® Value Index, which more closely reflects the types of securities in which the Fund invests, is the Fund’s secondary benchmark.
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns:–Are estimates 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 Small Cap Value 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 Small Cap Value 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), terrorism, war, 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 Small Cap Value Portfolio | Capitalization Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
•  
Capitalization Risk: Investments in small-capitalization companies may be more volatile than investments in large-capitalization companies. Investments in small-capitalization companies may have additional risks because these companies have limited product lines, markets or financial resources.
AB Small Cap Value Portfolio | Sector Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
•  
Sector Risk: The Fund may have more risk because it may invest to a significant extent in one or more particular market sectors, such as the financials sector. To the extent it does so, market or economic factors affecting the relevant sector(s) could have a major effect on the value of the Fund’s investments.
AB Small Cap Value 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, 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 Small Cap Value 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 0.80%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.05%
Other Expenses rr_Component2OtherExpensesOverAssets 0.07% [2]
Total Other Expenses rr_OtherExpensesOverAssets 0.12%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.17%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [3]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.16%
After 1 Year rr_ExpenseExampleYear01 $ 538
After 3 Years rr_ExpenseExampleYear03 780
After 5 Years rr_ExpenseExampleYear05 1,040
After 10 Years rr_ExpenseExampleYear10 $ 1,784
2015 rr_AnnualReturn2015 (2.30%)
2016 rr_AnnualReturn2016 29.49%
2017 rr_AnnualReturn2017 8.71%
2018 rr_AnnualReturn2018 (16.64%)
2019 rr_AnnualReturn2019 22.17%
2020 rr_AnnualReturn2020 3.18%
2021 rr_AnnualReturn2021 35.25%
2022 rr_AnnualReturn2022 (16.88%)
2023 rr_AnnualReturn2023 7.50%
2024 rr_AnnualReturn2024 11.23%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 34.82%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (37.58%)
1 Year rr_AverageAnnualReturnYear01 6.48% [4]
5 Years rr_AverageAnnualReturnYear05 5.84% [4]
10 Years rr_AverageAnnualReturnYear10 6.40% [4]
AB Small Cap Value 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% [5]
Exchange Fee rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.80%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.05%
Other Expenses rr_Component2OtherExpensesOverAssets 0.07% [2]
Total Other Expenses rr_OtherExpensesOverAssets 0.12%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.92%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [3]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.92%
After 1 Year rr_ExpenseExampleYear01 $ 295 [6]
After 3 Years rr_ExpenseExampleYear03 603
After 5 Years rr_ExpenseExampleYear05 1,037
After 10 Years rr_ExpenseExampleYear10 $ 2,048
1 Year rr_AverageAnnualReturnYear01 9.35%
5 Years rr_AverageAnnualReturnYear05 5.99%
10 Years rr_AverageAnnualReturnYear10 6.08%
AB Small Cap Value 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 0.80%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.05%
Other Expenses rr_Component2OtherExpensesOverAssets 0.07% [2]
Total Other Expenses rr_OtherExpensesOverAssets 0.12%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.92%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [3]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.92%
After 1 Year rr_ExpenseExampleYear01 $ 94
After 3 Years rr_ExpenseExampleYear03 293
After 5 Years rr_ExpenseExampleYear05 509
After 10 Years rr_ExpenseExampleYear10 $ 1,131
1 Year rr_AverageAnnualReturnYear01 11.48%
5 Years rr_AverageAnnualReturnYear05 7.03%
10 Years rr_AverageAnnualReturnYear10 7.14%
AB Small Cap Value Portfolio | Return After Taxes on Distributions | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 5.19% [4]
5 Years rr_AverageAnnualReturnYear05 4.80% [4]
10 Years rr_AverageAnnualReturnYear10 5.48% [4]
AB Small Cap Value Portfolio | Return After Taxes on Distributions and Sale of Fund Shares | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 4.19% [4]
5 Years rr_AverageAnnualReturnYear05 4.28% [4]
10 Years rr_AverageAnnualReturnYear10 4.89% [4]
AB Small Cap Value Portfolio | S&P 500 Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 25.02% [7]
5 Years rr_AverageAnnualReturnYear05 14.53% [7]
10 Years rr_AverageAnnualReturnYear10 13.10% [7]
AB Small Cap Value Portfolio | Russell 2000® Value Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 8.05% [7]
5 Years rr_AverageAnnualReturnYear05 7.29% [7]
10 Years rr_AverageAnnualReturnYear10 7.14% [7]
[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]
“Other Expenses” includes acquired fund fees and expenses totaling less than .01%.
[3]
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. The agreement will remain in effect until February 28, 2026 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.
[4] 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 estimates 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.
[5]
For Class C shares, the CDSC is 0% after the first year. Class C shares automatically convert to Class A shares after eight years.
[6]
If you did not redeem your shares at the end of the period, your expenses would be decreased by approximately $100.
[7]
Effective July 24, 2024, the primary broad-based index used for comparison with the Fund’s performance changed from the Russell 2000® Value Index to the S&P 500 Index to comply with new regulations that require the Fund’s primary benchmark to reflect the overall market in which the Fund may invest. The Fund’s previous primary benchmark, the Russell 2000® Value Index, which more closely reflects the types of securities in which the Fund invests, is the Fund’s secondary benchmark.