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AB Global Core Equity Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading AB Global Core 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 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 Funds—Sales Charge Reduction Programs for Class A Shares on page 65 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 127 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)
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 52% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 52.00%
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 circumstancesFor Class C shares, the CDSC is 0% after the first year. Class C shares automatically convert to Class A shares after ten years.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AB Mutual Funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example [Heading] rr_ExpenseExampleHeading Examples
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The Examples are intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Examples also assume that your investment has a 5% return each year and that the Fund’s operating expenses stay the same. 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 issuers from markets around the world. Under normal circumstances, the Fund invests at least 80% of its net assets in equity securities, at least 40% of its net assets in securities of
non-U.S.
companies, and invests in companies in at least three countries (including the United States).
The Fund is principally comprised of companies considered by the Adviser to offer good prospects for attractive returns relative to the general stock market. The Adviser seeks companies that are attractively valued and have the ability to generate high and sustainable returns on invested capital. In addition to returns on invested capital, other criteria that the Adviser considers include strong business fundamentals, capable management, prudent corporate governance, strong balance sheet, strong earnings power, high earnings quality, low downside risk, and substantial upside potential. In managing the Fund, the Adviser does not seek to have a bias towards any investment style, economic sector, country or company size. The Fund’s holdings of
non-U.S.
companies frequently include companies located in emerging markets, and at times emerging market companies will make up a significant portion of the Fund.
Fluctuations in currency exchange rates can have a dramatic impact of the returns of equity securities. While the Adviser may hedge the foreign currency exposure resulting from the Fund’s security positions through the use of currency-related derivatives, it is not required to do so.
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
•
 
Market Risk:
The value of the Fund’s assets will fluctuate as the stock or bond market fluctuates. The value of its 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. It includes the risk that a particular style of investing may underperform the market generally.
 
•
 
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.
 
•
 
Emerging Market Risk:
Investments in emerging market countries may have more risk because the markets are less developed and less liquid as well as being subject to increased economic, political, regulatory or other uncertainties.
 
•
 
Currency Risk:
Fluctuations in currency exchange rates may negatively affect the value of the Fund’s investments or reduce its returns.
 
•
 
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 information technology or financial services 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.
 
•
 
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.
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; 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. Through September 30, 2020, the
year-to-date
unannualized return for Class A shares was
-2.93%.
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 12.35%, 1st quarter, 2019; and Worst Quarter was down
-10.36%,
4th quarter, 2018.
Performance Table Heading rr_PerformanceTableHeading Performance Table Average Annual Total Returns (For the periods ended December 31, 2019)
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 Global Core Equity Portfolio | Class A Shares  
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 0.75%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.02%
Other Expenses rr_Component2OtherExpensesOverAssets 0.06%
Total Other Expenses rr_OtherExpensesOverAssets 0.08%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.08%
After 1 Year rr_ExpenseExampleYear01 $ 530
After 3 Years rr_ExpenseExampleYear03 754
After 5 Years rr_ExpenseExampleYear05 995
After 10 Years rr_ExpenseExampleYear10 $ 1,686
2010 rr_AnnualReturn2010 none
2011 rr_AnnualReturn2011 none
2012 rr_AnnualReturn2012 none
2013 rr_AnnualReturn2013 none
2014 rr_AnnualReturn2014 none
2015 rr_AnnualReturn2015 (2.77%)
2016 rr_AnnualReturn2016 7.75%
2017 rr_AnnualReturn2017 25.16%
2018 rr_AnnualReturn2018 (5.33%)
2019 rr_AnnualReturn2019 27.37%
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2020
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (2.93%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 12.35%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (10.36%)
1 Year rr_AverageAnnualReturnYear01 21.99% [2]
5 Years rr_AverageAnnualReturnYear05 8.65% [2]
Since Inception rr_AverageAnnualReturnSinceInception 8.42% [2],[3]
AB Global Core Equity Portfolio | Class C Shares  
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 0.75%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.02%
Other Expenses rr_Component2OtherExpensesOverAssets 0.07%
Total Other Expenses rr_OtherExpensesOverAssets 0.09%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.84%
After 1 Year rr_ExpenseExampleYear01 $ 287 [5]
After 3 Years rr_ExpenseExampleYear03 579
After 5 Years rr_ExpenseExampleYear05 995
After 10 Years rr_ExpenseExampleYear10 $ 2,159
1 Year rr_AverageAnnualReturnYear01 25.50%
5 Years rr_AverageAnnualReturnYear05 8.76%
Since Inception rr_AverageAnnualReturnSinceInception 8.50% [3]
AB Global Core Equity Portfolio | Advisor Class Shares  
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 0.75%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.02%
Other Expenses rr_Component2OtherExpensesOverAssets 0.07%
Total Other Expenses rr_OtherExpensesOverAssets 0.09%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.84%
After 1 Year rr_ExpenseExampleYear01 $ 86
After 3 Years rr_ExpenseExampleYear03 268
After 5 Years rr_ExpenseExampleYear05 466
After 10 Years rr_ExpenseExampleYear10 $ 1,037
1 Year rr_AverageAnnualReturnYear01 27.70%
5 Years rr_AverageAnnualReturnYear05 9.86%
Since Inception rr_AverageAnnualReturnSinceInception 9.60% [3]
AB Global Core Equity Portfolio | Return After Taxes on Distributions | Class A Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 20.90% [2]
5 Years rr_AverageAnnualReturnYear05 7.95% [2]
Since Inception rr_AverageAnnualReturnSinceInception 7.72% [2],[3]
AB Global Core Equity Portfolio | Return After Taxes on Distributions and Sale of Fund Shares | Class A Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 13.47% [2]
5 Years rr_AverageAnnualReturnYear05 6.66% [2]
Since Inception rr_AverageAnnualReturnSinceInception 6.47% [2],[3]
AB Global Core Equity Portfolio | MSCI ACWI Index (Net) (reflects no deduction for fees, expenses, or taxes except the reinvestment of dividends of non-U.S. withholding taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 26.60%
5 Years rr_AverageAnnualReturnYear05 8.41%
Since Inception rr_AverageAnnualReturnSinceInception 8.06% [3]
[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] 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.
[3] Inception date for all Classes: 11/12/14.
[4] For Class C shares, the CDSC is 0% after the first year. Class C shares automatically convert to Class A shares after ten years.
[5] If you did not redeem your shares at the end of the period, your expenses would be decreased by approximately $100.