XML 41 R4.htm IDEA: XBRL DOCUMENT v3.24.4
Label Element Value
AB Sustainable Thematic Balanced Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading AB Sustainable Thematic Balanced Portfolio
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Fund’s investment objective is to achieve a high total return without, in the opinion of the Adviser, undue risk to principal.
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 the family of AB Mutual Funds sponsored by AllianceBernstein L.P., the Fund’s investment adviser (the “Adviser”). 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 42 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 107 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 December 31, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund or an investment company in which the Fund invests 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 53% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 53.00%
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 the family of AB Mutual Funds sponsored by AllianceBernstein L.P., the Fund’s investment adviser (the “Adviser”).
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 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
The Fund invests in a diversified portfolio of equity and fixed-income securities. Normally, the Fund’s investments will consist of approximately 60% equity securities and 40% fixed-income securities, but these target allocations may vary. Under normal market conditions, the Fund will not deviate more than 10% from each target allocation. The Fund will not purchase a security if as a result less than 25% of its total assets would be invested in either equity securities or fixed-income securities. Under normal circumstances, at least 80% of the Fund’s net assets will be invested in securities of issuers that meet the Fund’s sustainability criteria, as described below.
In its equity investments, the Fund pursues opportunistic growth by investing primarily in a portfolio of U.S. companies whose business activities the Adviser believes position the company to benefit from certain environmentally- or socially-oriented sustainable investment themes that align with one or more of the United Nations Sustainable Development Goals (“SDGs”). These themes principally include the advancement of health, climate, and empowerment. A company that derives at least 25% of its total revenues from activities consistent with the achievement of the SDGs meets the Fund’s sustainability criteria, although many of the companies in which the Fund invests will derive a much greater portion of their revenues from such activities.
The Adviser normally considers a universe of primarily U.S. mid- to large-capitalization companies for investment.
The Adviser employs a combination of “top-down” and “bottom-up” investment processes with the goal of identifying, based on its internal research and analysis, the most attractive U.S. equity securities that fit into sustainable investment themes. First, under the “top-down” approach, the Adviser identifies the sustainable investment themes. In addition to this “top-down” thematic approach, the Adviser then uses a “bottom-up” analysis of individual companies that focuses on prospective earnings growth, valuation and quality of company management and on evaluating a company’s risks, including those related to environmental, social, and corporate governance (“ESG”) factors. ESG factors, which can vary across companies and industries, may include environmental impact, corporate governance, ethical business practices, diversity and employee practices, product safety, supply chain management and community impact. Eligible investments include securities of issuers that the Adviser believes will maximize total return while also contributing to positive societal impact aligned with one or more SDGs. While the Adviser emphasizes focusing on individual companies with favorable ESG attributes over the use of broad-based negative screens (e.g., disqualifying business activities) in assessing a company’s exposure to ESG factors, the Fund will not invest in companies that derive revenue from direct involvement in adult entertainment, alcohol, coal, controversial weapons, firearms, gambling, genetically modified organisms, military contracting, prisons, or tobacco.
The Fund’s fixed-income securities will consist predominantly of U.S. Government and agency securities, which must meet the Fund’s sustainability and ESG criteria for government securities. In this regard, the Adviser evaluates government securities based on the alignment of the nation’s policies with the SDGs and an internal scoring system that considers the nation’s policies on ESG issues.
The Fund expects to use derivatives, such as options, futures contracts, forwards and swaps. Derivatives may provide more efficient and economical exposure to market segments than direct investments, and may also be a more efficient way to alter the Fund’s exposures than making direct investments. For example, the Fund may use bond futures contracts and interest rate swaps to gain and adjust its exposures to the fixed-income markets.
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.
Effective December 1, 2021, the Fund made certain changes to its principal strategies, including the modification of the strategies to increase allocation to equity securities and to decrease investment in fixed-income securities and securities of non-U.S. issuers and the use of derivatives, and an emphasis on sustainable investment themes. In addition, effective July 14, 2017, the Fund’s principal strategies were revised to eliminate static asset allocation targets for investment, and to permit increased use of derivatives and investment in securities of non-U.S. issuers. In light of these changes, the performance shown below for periods prior to December 1, 2021 is based on the Fund’s prior principal strategies and may not be representative of the Fund’s performance under its current principal strategies.
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 composite 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.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, 2024, the year-to-date unannualized return for Class A shares was 10.61%.
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 9.02%, 2nd quarter, 2020; and Worst Quarter was down -14.55%, 1st quarter, 2020.
Performance Table Heading rr_PerformanceTableHeading Performance TableAverage Annual Total Returns(For the periods ended December 31, 2023)
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 other Classes of shares because these Classes have different expense ratios;
AB Sustainable Thematic Balanced 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 Sustainable Thematic Balanced 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 Sustainable Thematic Balanced Portfolio | ESG Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
•  
ESG Risk: Applying ESG and sustainability criteria to the investment process may exclude securities of certain issuers for non-investment reasons and, therefore, the Fund may forgo some market opportunities available to funds that do not use ESG or sustainability criteria. Securities of companies with ESG practices may shift into and out of favor depending on market and economic conditions, and the Fund’s performance may at times be better or worse than the performance of funds that do not use ESG or sustainability criteria. Furthermore, ESG and “sustainability” criteria are not uniformly defined, and the Fund’s ESG and sustainability criteria may differ from those used by other funds. In addition, in evaluating an investment, the Adviser is dependent upon information and data that may be incomplete, inaccurate or unavailable, which could adversely affect the analysis of the ESG and sustainability factors relevant to a particular investment.
AB Sustainable Thematic Balanced Portfolio | Allocation Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
•  
Allocation Risk: The allocation of investments among different investment styles, such as equity or debt, growth or value, U.S. or non-U.S. securities, or diversification strategies, may have a more significant effect on the Fund’s net asset value, or NAV, when one of these investments is performing more poorly than another.
AB Sustainable Thematic Balanced Portfolio | Capitalization Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
•  
Capitalization Risk: Investments in mid-capitalization companies may be more volatile than investments in large-capitalization companies. Investments in mid-capitalization companies may have additional risks because these companies may have limited product lines, markets or financial resources.
AB Sustainable Thematic Balanced Portfolio | Credit Risks [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
•  
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 (commonly known as “junk bonds”) are subject to a higher probability that an issuer will default or fail to meet its payment obligations.
AB Sustainable Thematic Balanced Portfolio | Interest Rate Risks [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
•  
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 effects of potential central bank monetary policy, and government fiscal policy, initiatives and market reactions to those initiatives.
AB Sustainable Thematic Balanced Portfolio | Inflation Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
•  
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.
AB Sustainable Thematic Balanced Portfolio | Derivatives Risks [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 Sustainable Thematic Balanced 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 Sustainable Thematic Balanced 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 0.50%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.11%
Other Expenses rr_Component2OtherExpensesOverAssets 0.36%
Total Other Expenses rr_OtherExpensesOverAssets 0.47%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.22%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.22%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.00%
After 1 Year rr_ExpenseExampleYear01 $ 523
After 3 Years rr_ExpenseExampleYear03 775
After 5 Years rr_ExpenseExampleYear05 1,047
After 10 Years rr_ExpenseExampleYear10 $ 1,821
2014 rr_AnnualReturn2014 3.56%
2015 rr_AnnualReturn2015 (0.73%)
2016 rr_AnnualReturn2016 3.65%
2017 rr_AnnualReturn2017 8.32%
2018 rr_AnnualReturn2018 (5.66%)
2019 rr_AnnualReturn2019 14.61%
2020 rr_AnnualReturn2020 4.39%
2021 rr_AnnualReturn2021 8.62%
2022 rr_AnnualReturn2022 (19.65%)
2023 rr_AnnualReturn2023 14.19%
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2024
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 10.61%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 9.02%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (14.55%)
1 Year rr_AverageAnnualReturnYear01 9.38% [3]
5 Years rr_AverageAnnualReturnYear05 2.69% [3]
10 Years rr_AverageAnnualReturnYear10 2.20% [3]
AB Sustainable Thematic Balanced 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 0.50%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.12%
Other Expenses rr_Component2OtherExpensesOverAssets 0.38%
Total Other Expenses rr_OtherExpensesOverAssets 0.50%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.00%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.25%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.75%
After 1 Year rr_ExpenseExampleYear01 $ 278 [5]
After 3 Years rr_ExpenseExampleYear03 603
After 5 Years rr_ExpenseExampleYear05 1,055
After 10 Years rr_ExpenseExampleYear10 $ 2,106
1 Year rr_AverageAnnualReturnYear01 12.33%
5 Years rr_AverageAnnualReturnYear05 2.79%
10 Years rr_AverageAnnualReturnYear10 1.87%
AB Sustainable Thematic Balanced 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 0.50%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.11%
Other Expenses rr_Component2OtherExpensesOverAssets 0.31%
Total Other Expenses rr_OtherExpensesOverAssets 0.42%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.92%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.17%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.75%
After 1 Year rr_ExpenseExampleYear01 $ 77
After 3 Years rr_ExpenseExampleYear03 276
After 5 Years rr_ExpenseExampleYear05 493
After 10 Years rr_ExpenseExampleYear10 $ 1,116
1 Year rr_AverageAnnualReturnYear01 14.46%
5 Years rr_AverageAnnualReturnYear05 3.86%
10 Years rr_AverageAnnualReturnYear10 2.92%
AB Sustainable Thematic Balanced 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 0.50%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.10%
Other Expenses rr_Component2OtherExpensesOverAssets 0.35%
Total Other Expenses rr_OtherExpensesOverAssets 0.45%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.95%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.20%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.75%
After 1 Year rr_ExpenseExampleYear01 $ 77
After 3 Years rr_ExpenseExampleYear03 283
After 5 Years rr_ExpenseExampleYear05 506
After 10 Years rr_ExpenseExampleYear10 $ 1,148
1 Year rr_AverageAnnualReturnYear01 14.54%
5 Years rr_AverageAnnualReturnYear05 3.85%
10 Years rr_AverageAnnualReturnYear10 2.89%
AB Sustainable Thematic Balanced Portfolio | Class Z  
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 0.50%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.03%
Other Expenses rr_Component2OtherExpensesOverAssets 0.38%
Total Other Expenses rr_OtherExpensesOverAssets 0.41%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.91%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.16%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.75%
After 1 Year rr_ExpenseExampleYear01 $ 77
After 3 Years rr_ExpenseExampleYear03 274
After 5 Years rr_ExpenseExampleYear05 488
After 10 Years rr_ExpenseExampleYear10 $ 1,105
1 Year rr_AverageAnnualReturnYear01 14.34% [6]
5 Years rr_AverageAnnualReturnYear05 3.83% [6]
10 Years rr_AverageAnnualReturnYear10 2.90% [6]
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 14, 2021 [6]
AB Sustainable Thematic Balanced Portfolio | Return After Taxes on Distributions | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 9.12% [3]
5 Years rr_AverageAnnualReturnYear05 1.74% [3]
10 Years rr_AverageAnnualReturnYear10 1.25% [3]
AB Sustainable Thematic Balanced Portfolio | Return After Taxes on Distributions and Sale of Fund Shares | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 5.68% [3]
5 Years rr_AverageAnnualReturnYear05 1.85% [3]
10 Years rr_AverageAnnualReturnYear10 1.41% [3]
AB Sustainable Thematic Balanced Portfolio | S&P 500® Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 26.29%
5 Years rr_AverageAnnualReturnYear05 15.69%
10 Years rr_AverageAnnualReturnYear10 12.03%
AB Sustainable Thematic Balanced Portfolio | 60% S&P 500® Index/40% Bloomberg U.S. Government/Credit Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 17.76% [7]
5 Years rr_AverageAnnualReturnYear05 10.12% [7]
10 Years rr_AverageAnnualReturnYear10 8.16% [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]
The Adviser has contractually agreed to waive its management fees and/or bear certain expenses of the Fund until December 31, 2025 to the extent necessary to prevent total Fund operating expenses (excluding acquired fund fees and expenses other than the advisory fees of any AB Funds in which the Fund may invest, interest expense and extraordinary expenses), on an annualized basis, from exceeding 1.00%, 1.75%, .75%, .75%, and .75% of average daily net assets, respectively, for Class A, Class C, Advisor Class, Class I and Class Z shares. 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. Each of the agreements will remain in effect until December 31, 2025 and may only be terminated or changed with the consent of the Fund’s Board of Trustees. 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 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.
[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.
[6] Inception date for Class Z shares: 12/14/21. Performance information for periods prior to the inception of Class Z shares is the performance of the Fund’s Class A shares adjusted to reflect the expenses of the Class Z shares.
[7] The information for the composite 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.