Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	ALLIANCEBERNSTEIN TRUST
Prospectus Date	rr_ProspectusDate	Mar. 01, 2014
AllianceBernstein Global Value Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	ALLIANCEBERNSTEIN GLOBAL VALUE FUND
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund’s investment objective is 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 AllianceBernstein 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 56 of this Prospectus and in Purchase of Shares--Sales Charge Reduction Programs for Class A Shares on page 113 of the Funds’ 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)
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 66% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	66.00%
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 CDSC which may be subject to waiver in certain circumstances. Class B shares automatically convert to Class A shares after eight years. The CDSC decreases over time. For Class B shares the CDSC decreases 1.00% annually to 0% after the fourth year. For Class C shares, the CDSC is 0% after the first year.
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 AllianceBernstein 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:
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	For the share classes listed below, you would pay the following expenses if you did not redeem your shares at the end of the period:
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL STRATEGIES
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund will invest primarily in a diversified portfolio of equity securities of established companies selected from more than 40 industries and from more than 40 developed and emerging market countries, including the United States. Under normal circumstances, the Fund invests significantly (at least 40%--unless market conditions are not deemed favorable by the Adviser) in securities of non-U.S. companies. The Fund normally invests in companies in at least three countries, generally including the United States. Other such countries currently include the developed nations in Europe and the Far East, Canada, Australia, and emerging market countries worldwide. The Fund invests in companies that are determined by the Adviser to be undervalued, using the Adviser’s fundamental value approach. In selecting securities for the Fund’s portfolio, the Adviser uses its fundamental and quantitative research to identify companies whose long-term earnings power is not reflected in the current market price of their securities. The Adviser’s fundamental analysis depends heavily upon its large internal research staff. The research staff begins with a global research universe of approximately 2,700 U.S., international and emerging market companies. Teams within the research staff cover a given industry worldwide to better understand each company’s competitive position in a global context. The Adviser typically projects a company’s financial performance over a full economic cycle, including a trough and a peak, within the context of forecasts for real economic growth, inflation and interest rate changes. The Adviser focuses on the valuation implied by the current price, relative to the earnings the company will be generating five years from now, or “normalized” earnings, assuming average mid-economic cycle growth for the fifth year. The Fund’s management team and other senior investment professionals work in close collaboration to weigh each investment opportunity identified by the research staff relative to the entire portfolio and determine the timing and position size for purchases and sales. Analysts remain responsible for monitoring new developments that would affect the securities they cover. The team will generally sell a security when it no longer meets appropriate valuation criteria, although sales may be delayed when positive return trends are favorable. Currencies can have a dramatic impact on equity returns, significantly adding to returns in some years and greatly diminishing them in others. The Adviser evaluates currency and equity positions separately and may seek to hedge the currency exposure resulting from securities positions when it finds the currency exposure unattractive. To hedge a portion of its currency risk, the Fund may from time to time invest in currency-related derivatives, including forward currency exchange contracts, futures, options on futures, swaps and options. The Adviser may also seek investment opportunities by taking long or short positions in currencies through the use of currency-related derivatives. The Fund may enter into other derivatives transactions, such as options, futures contracts, forwards, and swaps. The Fund may use options strategies involving the purchase and/or writing of various combinations of call and/or put options, including on individual securities and stock indices, futures contracts (including futures contracts on individual securities and stock indices) or shares of ETFs. These transactions may be used, for example, in an effort to earn extra income, to adjust exposure to individual securities or markets, or to protect all or a portion of the Fund’s portfolio from a decline in value, sometimes within certain ranges. The Fund may, at times, invest in shares of ETFs in lieu of making direct investments in equity securities. ETFs may provide more efficient and economical exposure to the type of companies and geographic locations in which the Fund seeks to invest than direct investments. The Fund may invest in depositary receipts, instruments of supranational entities denominated in the currency of any country, securities of multinational companies and “semi-governmental securities”, and enter into forward commitments.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	MARKET RISK: The value of the Fund's investments 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 that affect large portions of the market. It includes the risk that a particular style of investing, such as the Fund's value approach, may be underperforming 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 less liquid 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. DERIVATIVES RISK: Derivatives may be illiquid, difficult to price, and leveraged so that small changes may produce disproportionate losses for the Fund, and may be subject to counterparty risk to a greater degree than more traditional investments. LEVERAGE RISK: When the Fund borrows money or otherwise leverages its portfolio, it may be more volatile because leverage tends to exaggerate the effect of any increase or decrease in the value of the Fund's investments. The Fund may create leverage through the use of reverse repurchase agreements, forward commitments, or by borrowing money. 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. 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 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.AllianceBernstein.com (click on “Individuals--U.S.” then “Products & Performance”). The Fund’s past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	how the Fund’s performance changed from year to year over ten years; and how the Fund’s average annual returns for one, five and ten years compare to those of a broad-based securities market index.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.AllianceBernstein.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 23.24%, 2ND QUARTER, 2009; AND WORST QUARTER WAS DOWN -28.78%, 4TH QUARTER, 2008.
Performance Table Heading	rr_PerformanceTableHeading	PERFORMANCE TABLE AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, 2013)
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	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	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 Class B, Class C and Advisor Class shares because these Classes have different expense ratios;
AllianceBernstein Global Value Fund | 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_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.75%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.30%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.17%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.97%
Total Other Expenses	rr_OtherExpensesOverAssets	1.14%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.19%
After 1 Year	rr_ExpenseExampleYear01	638
After 3 Years	rr_ExpenseExampleYear03	1,081
After 5 Years	rr_ExpenseExampleYear05	1,550
After 10 Years	rr_ExpenseExampleYear10	2,841
2004	rr_AnnualReturn2004	18.28%
2005	rr_AnnualReturn2005	14.57%
2006	rr_AnnualReturn2006	26.88%
2007	rr_AnnualReturn2007	1.16%
2008	rr_AnnualReturn2008	(52.47%)
2009	rr_AnnualReturn2009	33.21%
2010	rr_AnnualReturn2010	8.36%
2011	rr_AnnualReturn2011	(15.90%)
2012	rr_AnnualReturn2012	12.78%
2013	rr_AnnualReturn2013	30.61%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	BEST QUARTER
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	23.24%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	WORST QUARTER
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(28.78%)
1 YEAR	rr_AverageAnnualReturnYear01	25.12%	[2]
5 YEARS	rr_AverageAnnualReturnYear05	11.37%	[2]
10 YEARS	rr_AverageAnnualReturnYear10	3.54%	[2]
AllianceBernstein Global Value Fund | CLASS B
Risk/Return:	rr_RiskReturnAbstract
Shareholder Fees Column [Text]	rr_ShareholderFeesColumnName	(NOT CURRENTLY OFFERED TO NEW INVESTORS)
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	4.00%	[3]
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.75%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.22%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.97%
Total Other Expenses	rr_OtherExpensesOverAssets	1.19%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.94%
After 1 Year	rr_ExpenseExampleYear01	697
After 3 Years	rr_ExpenseExampleYear03	1,110
After 5 Years	rr_ExpenseExampleYear05	1,548
After 10 Years	rr_ExpenseExampleYear10	3,085
After 1 Year	rr_ExpenseExampleNoRedemptionYear01	297
After 3 Years	rr_ExpenseExampleNoRedemptionYear03	910
After 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,548
After 10 Years	rr_ExpenseExampleNoRedemptionYear10	3,085
1 YEAR	rr_AverageAnnualReturnYear01	25.79%
5 YEARS	rr_AverageAnnualReturnYear05	11.44%
10 YEARS	rr_AverageAnnualReturnYear10	3.35%
AllianceBernstein Global Value Fund | 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_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.75%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.18%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.98%
Total Other Expenses	rr_OtherExpensesOverAssets	1.16%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.91%
After 1 Year	rr_ExpenseExampleYear01	394
After 3 Years	rr_ExpenseExampleYear03	901
After 5 Years	rr_ExpenseExampleYear05	1,533
After 10 Years	rr_ExpenseExampleYear10	3,233
After 1 Year	rr_ExpenseExampleNoRedemptionYear01	294
After 3 Years	rr_ExpenseExampleNoRedemptionYear03	901
After 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,533
After 10 Years	rr_ExpenseExampleNoRedemptionYear10	3,233
1 YEAR	rr_AverageAnnualReturnYear01	28.86%
5 YEARS	rr_AverageAnnualReturnYear05	11.51%
10 YEARS	rr_AverageAnnualReturnYear10	3.24%
AllianceBernstein Global Value Fund | 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_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.75%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.17%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.97%
Total Other Expenses	rr_OtherExpensesOverAssets	1.14%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.89%
After 1 Year	rr_ExpenseExampleYear01	192
After 3 Years	rr_ExpenseExampleYear03	594
After 5 Years	rr_ExpenseExampleYear05	1,021
After 10 Years	rr_ExpenseExampleYear10	2,212
1 YEAR	rr_AverageAnnualReturnYear01	31.10%
5 YEARS	rr_AverageAnnualReturnYear05	12.66%
10 YEARS	rr_AverageAnnualReturnYear10	4.30%
AllianceBernstein Global Value Fund | 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_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.75%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.50%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.23%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.97%
Total Other Expenses	rr_OtherExpensesOverAssets	1.20%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.45%
After 1 Year	rr_ExpenseExampleYear01	248
After 3 Years	rr_ExpenseExampleYear03	764
After 5 Years	rr_ExpenseExampleYear05	1,306
After 10 Years	rr_ExpenseExampleYear10	2,786
1 YEAR	rr_AverageAnnualReturnYear01	30.37%	[5]
5 YEARS	rr_AverageAnnualReturnYear05	12.06%	[5]
10 YEARS	rr_AverageAnnualReturnYear10	3.73%	[5]
INCEPTION DATE	rr_AverageAnnualReturnInceptionDate	Mar. 01, 2005	[5]
AllianceBernstein Global Value Fund | 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_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.75%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.20%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.96%
Total Other Expenses	rr_OtherExpensesOverAssets	1.16%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.16%
After 1 Year	rr_ExpenseExampleYear01	219
After 3 Years	rr_ExpenseExampleYear03	676
After 5 Years	rr_ExpenseExampleYear05	1,159
After 10 Years	rr_ExpenseExampleYear10	2,493
1 YEAR	rr_AverageAnnualReturnYear01	30.75%	[5]
5 YEARS	rr_AverageAnnualReturnYear05	12.37%	[5]
10 YEARS	rr_AverageAnnualReturnYear10	3.99%	[5]
INCEPTION DATE	rr_AverageAnnualReturnInceptionDate	Mar. 01, 2005	[5]
AllianceBernstein Global Value Fund | 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_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.75%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.12%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.97%
Total Other Expenses	rr_OtherExpensesOverAssets	1.09%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.84%
After 1 Year	rr_ExpenseExampleYear01	187
After 3 Years	rr_ExpenseExampleYear03	579
After 5 Years	rr_ExpenseExampleYear05	995
After 10 Years	rr_ExpenseExampleYear10	$ 2,159
1 YEAR	rr_AverageAnnualReturnYear01	31.20%	[5]
5 YEARS	rr_AverageAnnualReturnYear05	12.79%	[5]
10 YEARS	rr_AverageAnnualReturnYear10	4.38%	[5]
INCEPTION DATE	rr_AverageAnnualReturnInceptionDate	Mar. 01, 2005	[5]
AllianceBernstein Global Value Fund | Return After Taxes on Distributions | CLASS A
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	24.77%	[2]
5 YEARS	rr_AverageAnnualReturnYear05	10.99%	[2]
10 YEARS	rr_AverageAnnualReturnYear10	2.98%	[2]
AllianceBernstein Global Value Fund | Return After Taxes on Distributions and Sale of Fund Shares | CLASS A
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	14.46%	[2]
5 YEARS	rr_AverageAnnualReturnYear05	9.18%	[2]
10 YEARS	rr_AverageAnnualReturnYear10	3.19%	[2]
AllianceBernstein Global Value Fund | MSCI World Index (net) (reflects no deduction for fees, expenses, or taxes except the reinvestment of dividends net of U.S. withholding taxes)
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	26.68%
5 YEARS	rr_AverageAnnualReturnYear05	15.02%
10 YEARS	rr_AverageAnnualReturnYear10	6.98%

[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 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 Class B, Class C and Advisor Class 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.

[3] Class B shares automatically convert to Class A shares after eight years. The CDSC decreases over time. For Class B shares the CDSC decreases 1.00% annually to 0% after the fourth year.

[4] For Class C shares, the CDSC is 0% after the first year.

[5] Inception dates: 3/1/05 for Class R, Class K and Class I shares. Performance information for periods prior to the inception of Class R, Class K and Class I shares is the performance of the Fund's Class A shares adjusted to reflect the higher expense ratio of Class R shares and the lower expense ratios of Class K and Class I shares, respectively.