XML 20 R8.htm IDEA: XBRL DOCUMENT v3.21.2
Label Element Value
AB Emerging Markets Multi-Asset Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY INFORMATION AB Emerging Markets Multi-Asset Portfolio
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund’s investment objective is to maximize total return. Total return is the sum of capital appreciation and income.
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 and hold shares of the Fund. 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 Fund—Sales Charge Reduction Programs for Class A Shares on page 27 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 91 of the Fund’s Statement of Additional Information (“SAI”).
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.
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 July 31, 2022
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 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 88% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 88.00%
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 the 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 at least 80% of its net assets under normal circumstances in securities of emerging market issuers and/or the currencies of emerging market countries. Examples of emerging market countries include Argentina, Brazil, Chile, Croatia, Egypt, India, Indonesia, Israel, Kazakhstan, Malaysia, Mexico, the People’s Republic of China, Peru, the Philippines, Poland, Russia, South Africa, South Korea, Taiwan, Thailand, Turkey and Venezuela. Investing in emerging markets generally involves risks greater than the risks associated with investing in the markets of developed countries. The Fund may invest up to 20% of its net assets in the securities of developed market issuers.
The Fund invests in equity securities, debt securities and currencies, and does not attempt to maintain a constant or relatively constant allocation among these asset classes. Rather, allocations among asset classes are adjusted based on the Adviser’s view of the relative attractiveness of the asset classes. These allocations are informed by the Adviser’s proprietary asset allocation tools, which are comprised of a series of volatility, correlation and expected return forecasts. The Adviser reviews potential Fund investments in each asset class holistically from a country, currency, sector and security standpoint to optimize overall portfolio construction. Under normal circumstances, the Fund will invest between 30% and 95% of its net assets in equity securities, and between 0% and 65% of its net assets in debt securities, with any remainder held in cash (including foreign currency). The Fund is not constrained based on the country, region, market capitalization, credit quality or duration of its investments, and its assets may at times be concentrated in a particular country or region.
The process for selecting equity securities for the Fund is primarily
bottom-up.
The Adviser seeks to identify stocks that are attractive based on valuation, profitability, earnings quality, business trends, price momentum and other measures.
The process for selecting debt securities for the Fund is more
top-down.
The Adviser believes that inefficiencies in the global debt markets arise from investor emotion, market complexity and conflicting investment agendas. The Adviser combines quantitative forecasts with fundamental credit and economic research in seeking to exploit these inefficiencies. The Adviser seeks to generate returns from the Fund’s fixed-income investments through a combination of country selection, currency allocation, sector analysis and security selection. Debt securities may include those of both corporate and governmental issuers, and may include below investment grade debt securities (“junk bonds”). The Fund may invest in debt securities with a range of maturities from short- to long-term.
The Adviser considers both quantitative and fundamental factors in adjusting the Fund’s currency exposures. In addition to the Fund’s currency exposure that results from its investments in equity and debt securities denominated in foreign currencies (and any related hedging), the Fund may hold foreign currency (or related derivatives) independently of any such investments, and may hold a currency even if the Fund does not hold any securities denominated in that currency.
The Fund may utilize derivatives, such as futures contracts, forwards and swaps, and invest in exchange-traded funds, or ETFs, to a significant extent. Derivatives and ETFs may provide more efficient and economical exposure to market segments than direct investments, and may also be a quicker and more efficient way to alter the portfolio’s exposure than buying and selling direct investments. In determining when and to what extent to enter into derivatives transactions or to invest in ETFs, the Adviser will consider factors such as the relative risks and returns expected of potential investments and the cost of such transactions. Derivatives
may also be used for hedging purposes, including to hedge against interest rate, credit and currency fluctuations. The Adviser also expects to use derivatives frequently to effectively leverage the Fund by creating aggregate exposure somewhat in excess of the Fund’s net assets. The notional value of derivatives and ETFs linked to emerging market securities or currencies are counted towards meeting the percentage minimums and ranges set forth above, including the requirement that the Fund invest at least 80% of its net assets in the securities of emerging market issuers and/or the currencies of emerging market countries.
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
•  
Emerging Market Risk:
Investments in emerging market countries may involve more risk than investments in other foreign countries because the markets in emerging market countries are less developed and less liquid, and because these investments may be subject to increased economic, political, regulatory, or other uncertainties.
 
•  
Market Risk:
The value of the Fund’s assets will fluctuate as the stock, bond or currency 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), that affect large portions of the market.
 
•  
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. Emerging market currencies may be more volatile and less liquid, and subject to significantly greater risk of currency controls and convertibility restrictions, than currencies of developed countries.
 
•  
Country Concentration Risk:
The Fund may not always be diversified among countries or geographic regions and the effect on the Fund’s net asset value, or NAV, of the specific risks identified above, such as political, regulatory and currency risks, may be magnified due to concentration of the Fund’s investments in a particular country or region.
 
•  
Allocation Risk:
The allocation of Fund assets among different asset classes, such as equity securities, debt securities and currencies, may have a significant effect on the Fund’s NAV when one of these asset classes is performing better or worse than others. The diversification benefits typically associated with investing in both equity and debt securities may be limited in the emerging markets context, as movements in emerging market equity and emerging market debt markets may be more correlated than movements in the equity and debt markets of developed countries.
 
•  
Capitalization Risk:
Investments in small- and
mid-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.
 
•  
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 current historically low interest rate environment heightens the risks associated with rising interest rates.
 
•  
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.
 
•  
Sovereign Debt Risk:
Investments in sovereign debt obligations expose the Fund to the direct or indirect consequences of political, social and economic changes in countries that issue the obligations. Such changes may affect a foreign government’s willingness or ability to make timely payments of its obligations. In addition, no established market may exist for many sovereign debt obligations. Reduced secondary market liquidity may have an adverse effect on the market price of an instrument and the Fund’s ability to dispose of particular instruments.
 
•  
Below Investment Grade Securities Risk:
Investments in fixed-income securities with lower ratings (commonly known as “junk bonds”) tend to have a higher probability that an issuer will default or fail to meet its payment obligations. These securities may be subject to greater price volatility due to factors such as specific corporate developments, interest rate sensitivity and negative perceptions of the junk bond market generally, and may be more difficult to trade than other types of securities.
 
•  
Derivatives Risk:
Derivatives may be difficult to price or unwind and leveraged so that small changes may produce disproportionate losses for the Fund. Derivatives, especially
over-the-counter
derivatives, are also subject to counterparty risk.
 
•  
Leverage Risk:
To the extent the Fund uses leveraging techniques, its 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.
 
•  
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, large positions and heavy redemptions of Fund shares. Illiquid investments risk may be higher in a rising interest rate environment, when the value and liquidity of fixed-income securities generally decline.
 
•  
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.
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 the life of the Fund; and
 
•  
how the Fund’s average annual returns for one year, five years and since inception
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 the life of the Fund; and how the Fund’s average annual returns for one year, five years and since inception 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 June 30, 2021, the
year-to-date
unannualized return for Class A shares was 7.50%.
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
During the period shown in the bar chart, the Fund’s:
Best Quarter was up 18.67%, 2nd quarter, 2020; and Worst Quarter was down -22.13%, 1st quarter, 2020.
Performance Table Heading rr_PerformanceTableHeading Performance Table Average Annual Total Returns (For the periods ended December 31, 2020)
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 Emerging Markets Multi-Asset 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 0.85%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.04%
Other Expenses rr_Component2OtherExpensesOverAssets 0.50%
Total Other Expenses rr_OtherExpensesOverAssets 0.54%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.65%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.41%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.24%
After 1 Year rr_ExpenseExampleYear01 $ 546
After 3 Years rr_ExpenseExampleYear03 885
After 5 Years rr_ExpenseExampleYear05 1,247
After 10 Years rr_ExpenseExampleYear10 $ 2,264
2011 rr_AnnualReturn2011
2012 rr_AnnualReturn2012 15.24%
2013 rr_AnnualReturn2013 (8.35%)
2014 rr_AnnualReturn2014 0.15%
2015 rr_AnnualReturn2015 (6.62%)
2016 rr_AnnualReturn2016 11.68%
2017 rr_AnnualReturn2017 20.36%
2018 rr_AnnualReturn2018 (14.02%)
2019 rr_AnnualReturn2019 18.06%
2020 rr_AnnualReturn2020 13.46%
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 7.50%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 18.67%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.13%)
1 Year rr_AverageAnnualReturnYear01 8.67% [3]
5 Years rr_AverageAnnualReturnYear05 8.20% [3]
Since Inception rr_AverageAnnualReturnSinceInception 3.04% [3],[4]
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 31, 2011 [3]
AB Emerging Markets Multi-Asset 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 0.85%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.05%
Other Expenses rr_Component2OtherExpensesOverAssets 0.50%
Total Other Expenses rr_OtherExpensesOverAssets 0.55%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.41%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.42%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.99%
After 1 Year rr_ExpenseExampleYear01 $ 302 [6]
After 3 Years rr_ExpenseExampleYear03 711
After 5 Years rr_ExpenseExampleYear05 1,248
After 10 Years rr_ExpenseExampleYear10 $ 2,525
1 Year rr_AverageAnnualReturnYear01 11.65%
5 Years rr_AverageAnnualReturnYear05 8.32%
Since Inception rr_AverageAnnualReturnSinceInception 2.76% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 31, 2011
AB Emerging Markets Multi-Asset 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 0.85%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.04%
Other Expenses rr_Component2OtherExpensesOverAssets 0.50%
Total Other Expenses rr_OtherExpensesOverAssets 0.54%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.40%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.41%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.99%
After 1 Year rr_ExpenseExampleYear01 $ 101
After 3 Years rr_ExpenseExampleYear03 403
After 5 Years rr_ExpenseExampleYear05 727
After 10 Years rr_ExpenseExampleYear10 $ 1,644
1 Year rr_AverageAnnualReturnYear01 13.72%
5 Years rr_AverageAnnualReturnYear05 9.41%
Since Inception rr_AverageAnnualReturnSinceInception 3.79% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 31, 2011
AB Emerging Markets Multi-Asset 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 0.85%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.26%
Other Expenses rr_Component2OtherExpensesOverAssets 0.49%
Total Other Expenses rr_OtherExpensesOverAssets 0.75%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.11%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.62%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.49%
After 1 Year rr_ExpenseExampleYear01 $ 152
After 3 Years rr_ExpenseExampleYear03 601
After 5 Years rr_ExpenseExampleYear05 1,077
After 10 Years rr_ExpenseExampleYear10 $ 2,392
1 Year rr_AverageAnnualReturnYear01 13.21%
5 Years rr_AverageAnnualReturnYear05 8.89%
Since Inception rr_AverageAnnualReturnSinceInception 3.28% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 31, 2011
AB Emerging Markets Multi-Asset 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 0.85%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.20%
Other Expenses rr_Component2OtherExpensesOverAssets 0.50%
Total Other Expenses rr_OtherExpensesOverAssets 0.70%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.81%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.57%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.24%
After 1 Year rr_ExpenseExampleYear01 $ 126
After 3 Years rr_ExpenseExampleYear03 514
After 5 Years rr_ExpenseExampleYear05 927
After 10 Years rr_ExpenseExampleYear10 $ 2,080
1 Year rr_AverageAnnualReturnYear01 13.50%
5 Years rr_AverageAnnualReturnYear05 9.15%
Since Inception rr_AverageAnnualReturnSinceInception 3.54% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 31, 2011
AB Emerging Markets Multi-Asset 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 0.85%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.02%
Other Expenses rr_Component2OtherExpensesOverAssets 0.37%
Total Other Expenses rr_OtherExpensesOverAssets 0.39%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.25%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.26%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.99%
After 1 Year rr_ExpenseExampleYear01 $ 101
After 3 Years rr_ExpenseExampleYear03 371
After 5 Years rr_ExpenseExampleYear05 661
After 10 Years rr_ExpenseExampleYear10 $ 1,488
1 Year rr_AverageAnnualReturnYear01 13.84%
5 Years rr_AverageAnnualReturnYear05 9.40%
Since Inception rr_AverageAnnualReturnSinceInception 3.79% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 31, 2011
AB Emerging Markets Multi-Asset 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 0.85%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.02%
Other Expenses rr_Component2OtherExpensesOverAssets 0.44%
Total Other Expenses rr_OtherExpensesOverAssets 0.46%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.32%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.33%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.99%
After 1 Year rr_ExpenseExampleYear01 $ 101
After 3 Years rr_ExpenseExampleYear03 386
After 5 Years rr_ExpenseExampleYear05 692
After 10 Years rr_ExpenseExampleYear10 $ 1,561
1 Year rr_AverageAnnualReturnYear01 13.68% [4]
5 Years rr_AverageAnnualReturnYear05 9.42% [4]
Since Inception rr_AverageAnnualReturnSinceInception 3.78% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 31, 2017 [4]
AB Emerging Markets Multi-Asset Portfolio | Return After Taxes on Distributions | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 7.99% [3]
5 Years rr_AverageAnnualReturnYear05 6.77% [3]
Since Inception rr_AverageAnnualReturnSinceInception 1.95% [3],[4]
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 31, 2011 [3]
AB Emerging Markets Multi-Asset Portfolio | Return After Taxes on Distributions and Sale of Fund Shares | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 5.41% [3]
5 Years rr_AverageAnnualReturnYear05 5.89% [3]
Since Inception rr_AverageAnnualReturnSinceInception 1.95% [3],[4]
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 31, 2011 [3]
AB Emerging Markets Multi-Asset Portfolio | MSCI Emerging Markets Index (net) (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 18.31%
5 Years rr_AverageAnnualReturnYear05 12.81%
Since Inception rr_AverageAnnualReturnSinceInception 4.89% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 31, 2011
[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 fee and/or to bear certain expenses of the Fund through July 31, 2022 to the extent necessary to prevent total Fund operating expenses (excluding expenses associated with acquired fund fees and expenses other than the advisory fees of any AB Mutual Funds in which the Fund may invest, interest expense and extraordinary expenses), on an annualized basis, from exceeding 1.24%, 1.99%, .99%, 1.49%, 1.24%, .99% and .99% of average daily net assets, respectively, for Class A, Class C, Advisor Class, Class R, Class K, Class I and Class Z shares (“expense limitations”). 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 July 31, 2022 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] Since inception return is from August 31, 2011. Inception date for Class Z shares is July 31, 2017. Performance information for Class Z shares 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 Class Z shares.
[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.