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AB All China Equity 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 0.95%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.03%
Other Expenses rr_Component2OtherExpensesOverAssets none [2]
Component3 Other Expenses rr_Component3OtherExpensesOverAssets 0.63% [3]
Total Other Expenses rr_OtherExpensesOverAssets 0.66%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.86%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.36%) [4]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.50% [5]
After 1 Year rr_ExpenseExampleYear01 $ 571
After 3 Years rr_ExpenseExampleYear03 951
After 5 Years rr_ExpenseExampleYear05 1,356
After 10 Years rr_ExpenseExampleYear10 $ 2,484
2015 rr_AnnualReturn2015
2016 rr_AnnualReturn2016
2017 rr_AnnualReturn2017
2018 rr_AnnualReturn2018
2019 rr_AnnualReturn2019 37.12%
2020 rr_AnnualReturn2020 25.07%
2021 rr_AnnualReturn2021 (14.76%)
2022 rr_AnnualReturn2022 (26.89%)
2023 rr_AnnualReturn2023 (11.16%)
2024 rr_AnnualReturn2024 17.17%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 27.93%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (23.81%)
1 Year rr_AverageAnnualReturnYear01 12.23% [6]
5 Years rr_AverageAnnualReturnYear05 (4.92%) [6]
Since Inception rr_AverageAnnualReturnSinceInception (2.76%) [6],[7]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 25, 2018
AB All China Equity Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading AB All China Equity 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 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 101% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 101.00%
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.
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 Adviser seeks to achieve the Fund’s investment objective by investing, under normal circumstances, at least 80% of the Fund’s net assets in a portfolio of equity securities of companies economically tied to the People’s Republic of China (“China”) (including Hong Kong). A company is considered to be economically tied to China if: (i) the company is domiciled or organized in China; (ii) the company has securities that are traded principally in China; or (iii) the company conducts a substantial part of its economic activities in China or is a U.S.-listed entity established by a company conducting a substantial part of its economic activities in China, which has been structured to provide investors with exposure to the company. Equity securities may include common stocks, preferred stocks, the equity securities of real estate investment trusts, or REITs, depositary receipts and derivative instruments related to equity securities. The Adviser expects to invest Fund assets both in shares of companies that trade on the Shanghai Stock Exchange or the Shenzhen Stock Exchange (“China A shares”) and shares of companies economically tied to China that trade in Hong Kong or outside of China.
The Adviser believes that, over time, securities that are undervalued by the market relative to their long-term earnings power can provide high returns. The Adviser utilizes fundamental analysis and its quantitative models to attempt to identify these securities for investment by the Fund, attempting to balance factors relating to valuation, company quality and investor sentiment, and will seek to build a portfolio that delivers attractive risk-adjusted returns.
The Adviser may, but frequently will not, hedge the foreign currency exposure resulting from the Fund’s security positions through the use of currency-related derivatives.
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 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; andhow 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.
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 27.93%, 1st quarter, 2019; and Worst Quarter was down -23.81%, 3rd quarter, 2022.
Performance Table Heading rr_PerformanceTableHeading Performance Table Average Annual Total Returns (For the periods ended December 31, 2024)
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 All China Equity 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 All China Equity 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 All China Equity Portfolio | Foreign Non U S Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
•  
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. Investments in emerging market countries such as China may involve more risk than investments in developed countries because the markets in emerging market countries are less developed and less liquid and are subject to increased economic, political, regulatory, or other uncertainties. In addition, the value of the Fund’s investments may decline because of factors such as unfavorable or unsuccessful government actions and reduction in government or central bank support.
AB All China Equity Portfolio | China Single Country Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
•  
China/Single Country Risk: Investments in issuers located in a particular country or geographic region typically involve more risk than investments in U.S. issuers because of particular market factors affecting that country or region, including political instability, geopolitical risks or unpredictable economic conditions. Risks of the Fund’s investments in securities of companies economically tied to China may include the volatility of the Chinese stock market; the Chinese economy’s heavy dependence on exports, which may be affected adversely by trade barriers or disputes or may decrease, sometimes significantly, when the world economy weakens; and the continuing importance of the role of the Chinese Government, which may take legal or regulatory actions that affect the contractual arrangements of a company or economic and market practices, and cause the value of the
 
securities of an issuer held by the Fund to decrease significantly. Recent developments in relations between the U.S. and China have heightened concerns of increased tariffs and restrictions on trade between the two countries. An increase in tariffs or trade restrictions, or even the threat of such developments, could lead to a significant reduction in international trade, which could have a negative impact on the economy of Asian countries and a commensurately negative impact on the Fund. In addition, the Fund’s investments in companies owned or controlled directly or indirectly by the central, provincial or municipal governments of the People’s Republic of China or by the People’s Liberation Army (the military arm of the Chinese Communist Party) involve risks that political changes, social instability, regulatory uncertainty, adverse diplomatic developments, asset expropriation or nationalization, economic sanctions, trade embargos, cancellation of investors’ interests, or confiscatory taxation could adversely affect the performance of such companies and therefore investments by the Fund in those companies. China has a complex territorial dispute regarding the sovereignty of Taiwan and has made threats of invasion. Military conflict between China and Taiwan may adversely affect securities of Chinese, Taiwan-based and other issuers both in and outside the region. While the Chinese economy has grown at a rapid rate in recent years, the rate of growth has been declining, and there can be no assurance that China’s economy will continue to grow in the future. Investments in China A shares are subject to various licenses and quotas that may restrict daily trading and to additional risks that could affect liquidity compared to investments in companies in developed markets. Risks of investments in companies based in Hong Kong include heavy reliance on the Chinese economy, plus regional Asian and global economies such as the U.S. economy, which makes these investments vulnerable to changes in these economies.
AB All China Equity Portfolio | Currency Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
•  
Currency Risk: Fluctuations in currency exchange rates may negatively affect the value of the Fund’s investments in equity securities denominated in foreign currencies or reduce the Fund’s 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.
AB All China Equity Portfolio | Depositary Receipts Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
•  
Depositary Receipts Risk: Investing in depositary receipts involves risks that are similar to the risks of direct investments in foreign securities. For example, investing in depositary receipts may involve risks relating to political, economic or regulatory conditions in foreign countries. In addition, the issuers of the securities underlying certain depositary receipts are under no obligation to distribute shareholder communications or pass through any voting rights with respect to the deposited securities to the holders of such receipts.
AB All China Equity Portfolio | Illiquid Investments Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
•  
Illiquid Investments Risk: Illiquid investments risk exists when certain investments are or become difficult to purchase or sell. Difficulty in selling such investments may result in sales at disadvantageous prices affecting the value of your investment in the Fund. Causes of illiquid investments risk may include low trading volumes and large positions. Foreign fixed-income securities may have more illiquid investments risk because secondary trading markets for these securities may be smaller and less well-developed and the securities may trade less frequently than domestic securities. Illiquid investments risk may be higher in a rising interest rate environment, when the value and liquidity of fixed-income securities generally go down.
AB All China Equity 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 consumer discretionary 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 All China Equity 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 All China Equity 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 0.95%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.03%
Other Expenses rr_Component2OtherExpensesOverAssets 0.01%
Component3 Other Expenses rr_Component3OtherExpensesOverAssets 0.61% [3]
Total Other Expenses rr_OtherExpensesOverAssets 0.65%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.60%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.34%) [4]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.26% [5]
After 1 Year rr_ExpenseExampleYear01 $ 128
After 3 Years rr_ExpenseExampleYear03 472
After 5 Years rr_ExpenseExampleYear05 839
After 10 Years rr_ExpenseExampleYear10 $ 1,871
1 Year rr_AverageAnnualReturnYear01 17.41%
5 Years rr_AverageAnnualReturnYear05 (3.87%)
Since Inception rr_AverageAnnualReturnSinceInception (1.86%) [7]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 25, 2018
AB All China Equity Portfolio | Return After Taxes on Distributions | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 11.70% [6]
5 Years rr_AverageAnnualReturnYear05 (5.09%) [6]
Since Inception rr_AverageAnnualReturnSinceInception (2.93%) [6],[7]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 25, 2018
AB All China Equity Portfolio | Return After Taxes on Distributions and Sale of Fund Shares | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 8.05% [6]
5 Years rr_AverageAnnualReturnYear05 (3.49%) [6]
Since Inception rr_AverageAnnualReturnSinceInception (1.93%) [6],[7]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 25, 2018
AB All China Equity Portfolio | MSCI China All Shares Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 16.38%
5 Years rr_AverageAnnualReturnYear05 (1.78%)
Since Inception rr_AverageAnnualReturnSinceInception (0.61%) [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]
Amount is less than .005%.
[3]
“Other Expenses” includes acquired fund fees and expenses totaling less than .01%.
[4] The Adviser has contractually agreed to waive its management fees and/or to bear certain expenses of the Fund 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, taxes, extraordinary expenses, and brokerage commissions and other transaction costs), on an annualized basis, from exceeding 1.50% and 1.25% of average daily net assets, respectively, for Class A and Advisor Class shares. In addition to that agreement, 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 February 28, 2026 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.
[5] If interest expense were excluded, net expenses would be as follows: Class A Advisor Class 1.50% 1.25%
[6] 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.
[7]
Inception date for all Classes is July 25, 2018.