| Label | Element | Value | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Class Z Shares | International Strategic Equities Portfolio | |||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||
| Risk/Return [Heading] | rr_RiskReturnHeading | SUMMARY INFORMATION: BERNSTEIN FUND, INC. NON-U.S. EQUITY PORTFOLIOS International Strategic Equities Portfolio of Bernstein Fund, Inc. | |||||||
| Objective [Heading] | rr_ObjectiveHeading | INVESTMENT OBJECTIVE: | |||||||
| Objective, Primary [Text Block] | rr_ObjectivePrimaryTextBlock | The Portfolio’s investment objective is to provide long-term growth of capital.
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| Expense [Heading] | rr_ExpenseHeading | FEES AND EXPENSES OF THE PORTFOLIO: | |||||||
| 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 Portfolio. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
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| Shareholder Fees Caption [Text] | rr_ShareholderFeesCaption | Shareholder Fees (fees paid directly from your investment) | |||||||
| Operating Expenses Caption [Text] | rr_OperatingExpensesCaption | Annual Portfolio 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 Portfolio 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 Portfolio shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Portfolio Operating Expenses or in the Examples, affect the Portfolio’s performance. For the most recent fiscal year, the Portfolio’s portfolio turnover rate was 69% of the average value of its portfolio.
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| Portfolio Turnover, Rate | rr_PortfolioTurnoverRate | 69.00% | |||||||
| 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 Portfolio with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Portfolio 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 Portfolio’s operating expenses stay the same. Although your actual costs may be higher or lower, based on these assumptions your costs as reflected in the Examples would be:
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| Strategy [Heading] | rr_StrategyHeading | PRINCIPAL STRATEGIES: | |||||||
| Strategy Narrative [Text Block] | rr_StrategyNarrativeTextBlock | The Portfolio invests, under normal circumstances, at least 80% of its net assets (plus any borrowings for investment purposes) in equity securities or other securities or instruments with similar economic characteristics, including derivatives related to equity securities. Equity securities are primarily common stocks, although, for purposes of the 80% policy, equity securities may also include preferred stocks, warrants, convertible securities, sponsored or unsponsored American Depositary Receipts (“ADRs”) and Global Depositary Receipts (“GDRs”) and equity real estate investment trusts (“REITs”). You will be notified at least 60 days prior to any change to the Portfolio’s 80% investment policy. AllianceBernstein L.P. serves as the Portfolio’s investment manager (the “Manager”). The Manager invests the assets of the Portfolio primarily (under normal circumstances, at least 65% of net assets) in equity securities of issuers in countries that make up the Morgan Stanley Capital International (“MSCI”) All Country World Index (“ACWI”) ex USA Index, which includes both developed and emerging market countries. The Portfolio focuses on securities of large-cap and mid-cap companies. The Manager expects to allocate fund assets among issuers in many foreign countries, but not necessarily in the same proportion that the countries are represented in the MSCI ACWI ex USA Index and may invest in issuers in countries outside of the MSCI ACWI ex USA Index. The Portfolio’s exposure among non-U.S. countries may change over time based on the Manager’s assessment of market conditions and the investment merit of particular non-U.S. issuers. Under normal circumstances, the Manager invests in companies located in at least three countries other than the United States and expects to have exposure to issuers in several different countries. In determining a company’s location for purposes of the Portfolio’s investment policies and restrictions, the Manager may consider: (1) the place of domicile; (2) where the company has an established presence and conducts its business; and (3) where the company conducts a significant part of its economic activities. The Portfolio may, at times, invest significantly in emerging markets. The Manager utilizes both fundamental and quantitative research to both determine which securities will be held by the Portfolio and to manage risk. In applying its quantitative analysis, the Manager considers a number of metrics that have historically provided some indication of favorable future returns, including metrics relating to valuation, quality, investor behavior and corporate behavior. Utilizing these resources, the Manager expects to allocate the Portfolio’s assets among issuers, industries and geographic locations to attempt to create a diversified portfolio of investments. The Portfolio may also invest in exchange-traded funds (“ETFs”) and other investment companies from time to time. The Portfolio expects to utilize derivatives, such as options, futures contracts, forwards and swaps. For example, the Portfolio may invest in currency derivatives as discussed below and in futures contracts to gain exposure to certain markets. Derivatives may provide a more efficient and economical exposure to market segments than direct investments, and may also be a more efficient way to alter the Portfolio’s exposure. Fluctuations in currency exchange rates can have a dramatic impact on the returns of foreign equity securities. The Manager may employ currency hedging strategies, including the use of currency-related derivatives, to seek to reduce currency risk in the Portfolio, but it is not required to do so. The Manager may also take long and short positions in currencies or related derivatives for investment purposes, independent of any security positions. The Manager may use stock index futures contracts to gain access to certain markets.
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| 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 Portfolio by showing:
The Portfolio’s past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future. As with all investments, you may lose money by investing in the Portfolio. You may obtain updated performance information for the Portfolio at www.bernstein.com (at the bottom of the page, click on “Investments,” then “Mutual Fund Performance at a Glance”).
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| Performance Information Illustrates Variability of Returns [Text] | rr_PerformanceInformationIllustratesVariabilityOfReturns | how the Portfolio’s performance changed from year to year over the life of the Portfolio; andhow the Portfolio’s average annual returns for one year, five years and over the life of the Portfolio compare to those of a broad-based securities market index. | |||||||
| Performance Availability Website Address [Text] | rr_PerformanceAvailabilityWebSiteAddress | www.bernstein.com | |||||||
| Performance Past Does Not Indicate Future [Text] | rr_PerformancePastDoesNotIndicateFuture | The Portfolio’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 Portfolio’s Class Z shares.
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| Bar Chart Closing [Text Block] | rr_BarChartClosingTextBlock | Calendar Year End (%) During the period shown in the bar chart, the Portfolio’s: Best Quarter was up 15.51%, 2nd quarter, 2020; and Worst Quarter was down -23.49%, 1st quarter, 2020. | |||||||
| 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 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 Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. | |||||||
| Performance Table Narrative | rr_PerformanceTableNarrativeTextBlock | 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; 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 Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
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| Class Z Shares | International Strategic Equities Portfolio | Risk Lose Money [Member] | |||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||
| Risk [Text Block] | rr_RiskTextBlock | The share price of the Portfolio will fluctuate and you may lose money. | |||||||
| Class Z Shares | International Strategic Equities Portfolio | Foreign Non U S Securities Risk [Member] | |||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||
| Risk [Text Block] | rr_RiskTextBlock |
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| Class Z Shares | International Strategic Equities Portfolio | Market Risk [Member] | |||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||
| Risk [Text Block] | rr_RiskTextBlock |
The United States and other countries are periodically involved in disputes over trade and other matters, which may result in tariffs on various categories of goods imported from the other country, restrictions on investment and adverse impacts on affected companies and securities. For example, the current political climate between the United States and China has intensified concerns about protectionist trade policies and a potential trade war between China and the United States. The United States has imposed tariffs and other trade barriers on Chinese exports and placed other restrictions on or barriers to investments in China. Trade disputes, particularly prolonged disputes, may adversely affect the economies of the United States and its trading partners, as well as the companies directly or indirectly affected by the dispute and financial markets generally, and thus may adversely affect the value of the Portfolio’s assets. In addition, an increase in tariffs or trade restrictions, or even the threat of such increased tariffs or restrictions, could lead to a significant reduction in international trade, which could have a negative impact on the global economy and a commensurately negative impact on the Portfolio. The United States government has in the recent past acted to prohibit U.S. persons, such as the Portfolio, from owning, and required them to divest, certain Chinese companies designated as related to the Chinese military. There is no assurance that more such companies will not be so designated in the future, which could limit the Portfolio’s opportunities for investment and require the sale of securities at a loss or make them illiquid. Some countries and regions in which the Portfolio invests have strained international relations due to territorial disputes, historical animosities or other defense concerns. Incidents involving a country’s or region’s security may cause uncertainty in the markets and may adversely affect a Portfolio’s investments. For example, the Chinese government is involved in a territorial dispute with Taiwan as well as other territorial disputes; the risk of a forced unification with Taiwan by the Chinese government may adversely affect securities of Chinese, Taiwan-based and other issuers both in and outside the region. If the political climate between the United States, China and other countries in Asia continues to deteriorate, economies and markets may be adversely affected. Policy and legislative changes in the U.S. and in other countries are affecting many aspects of financial regulation, and these and other events affecting global markets, such as the United Kingdom’s exit from the European Union; potential trade imbalances with China or other countries; or sanctions or other government actions against Russia, other nations, or individuals or companies (or countermeasures taken in response to such sanctions), may contribute to decreased liquidity and increased volatility in the financial markets. The impact of these changes on the markets, and the implications for market participants, may not be fully known for some time. Economies and financial markets throughout the world are highly interconnected. Economic, financial or political events, trading and tariff arrangements, armed conflict, including Russia’s military invasion of Ukraine and the conflict involving Israel and other countries in the Middle East, terrorism, natural disasters (including the spread of infectious illness) and other circumstances in one country or region could have profound impacts on global economies or markets. Following Russia’s invasion of Ukraine commencing in February of 2022, the United States, the European Union and other countries instituted numerous sanctions against Russia and Belarus and certain companies and individuals. Russia in turn has taken a large number of retaliatory actions, some of which effectively froze Russian securities held by U.S. investors (including U.S. funds such as the Portfolio) and investors in other countries viewed as “unfriendly” by Russia, including securities represented by depositary receipts, effectively precluding the Portfolio from buying, selling, receiving or delivering those securities or accessing income received on such securities. Since then, Russian securities held by investors in the U.S. and other jurisdictions viewed as “unfriendly” by Russia have lost all, or nearly all, of their market value, and many other issuers, securities and markets have been adversely affected. The disruption of the Russian economy has had severe adverse effects on the region and beyond, including significant negative impacts on the markets for certain securities and commodities, such as oil and natural gas, as well as other sectors. As a result, whether or not the Portfolio invests in securities of issuers located in or with significant exposure to countries experiencing economic and financial difficulties, the value and liquidity of the Portfolio’s investments may be negatively affected.
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| Class Z Shares | International Strategic Equities Portfolio | Foreign Currency Risk [Member] | |||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||
| Risk [Text Block] | rr_RiskTextBlock |
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| Class Z Shares | International Strategic Equities Portfolio | Country Concentration Risk [Member] | |||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||
| Risk [Text Block] | rr_RiskTextBlock |
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| Class Z Shares | International Strategic Equities Portfolio | Emerging Markets Securities Risk [Member] | |||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||
| Risk [Text Block] | rr_RiskTextBlock |
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| Class Z Shares | International Strategic Equities Portfolio | Sector Risk [Member] | |||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||
| Risk [Text Block] | rr_RiskTextBlock |
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| Class Z Shares | International Strategic Equities Portfolio | Redemption Risk [Member] | |||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||
| Risk [Text Block] | rr_RiskTextBlock |
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| Class Z Shares | International Strategic Equities Portfolio | Actions by a Few Major Investors [Member] | |||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||
| Risk [Text Block] | rr_RiskTextBlock |
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| Class Z Shares | International Strategic Equities Portfolio | Capitalization Risk [Member] | |||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||
| Risk [Text Block] | rr_RiskTextBlock |
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| Class Z Shares | International Strategic Equities Portfolio | Allocation Risk [Member] | |||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||
| Risk [Text Block] | rr_RiskTextBlock |
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| Class Z Shares | International Strategic Equities Portfolio | Derivatives Risks [Member] | |||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||
| Risk [Text Block] | rr_RiskTextBlock |
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| Class Z Shares | International Strategic Equities Portfolio | Real Estate Related Securities Risk [Member] | |||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||
| Risk [Text Block] | rr_RiskTextBlock |
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| Class Z Shares | International Strategic Equities Portfolio | Investment in Other Investment Companies Risk [Member] | |||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||
| Risk [Text Block] | rr_RiskTextBlock |
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| Class Z Shares | International Strategic Equities Portfolio | Illiquid Investments Risk [Member] | |||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||
| Risk [Text Block] | rr_RiskTextBlock |
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| Class Z Shares | International Strategic Equities Portfolio | Management Risk [Member] | |||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||
| Risk [Text Block] | rr_RiskTextBlock |
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| Class Z Shares | International Strategic Equities 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 | |||||||
| Maximum Account Fee | rr_MaximumAccountFeeOverAssets | none | |||||||
| Management Fees | rr_ManagementFeesOverAssets | 0.66% | |||||||
| Distribution and/or Service (12b-1) Fees | rr_DistributionAndService12b1FeesOverAssets | none | |||||||
| Other Expenses: Transfer Agent | rr_Component2OtherExpensesOverAssets | 0.03% | |||||||
| Other Expenses | rr_Component3OtherExpensesOverAssets | 0.03% | |||||||
| Total Other Expenses | rr_OtherExpensesOverAssets | 0.06% | |||||||
| Total Annual Portfolio Operating Expenses | rr_ExpensesOverAssets | 0.72% | |||||||
| After 1 Year | rr_ExpenseExampleYear01 | $ 74 | |||||||
| After 3 Years | rr_ExpenseExampleYear03 | 230 | |||||||
| After 5 Years | rr_ExpenseExampleYear05 | 401 | |||||||
| After 10 Years | rr_ExpenseExampleYear10 | $ 894 | |||||||
| 2015 | rr_AnnualReturn2015 | ||||||||
| 2016 | rr_AnnualReturn2016 | 2.49% | |||||||
| 2017 | rr_AnnualReturn2017 | 29.97% | |||||||
| 2018 | rr_AnnualReturn2018 | (14.98%) | |||||||
| 2019 | rr_AnnualReturn2019 | 19.92% | |||||||
| 2020 | rr_AnnualReturn2020 | 4.36% | |||||||
| 2021 | rr_AnnualReturn2021 | 10.31% | |||||||
| 2022 | rr_AnnualReturn2022 | (17.62%) | |||||||
| 2023 | rr_AnnualReturn2023 | 13.55% | |||||||
| 2024 | rr_AnnualReturn2024 | 12.73% | |||||||
| Highest Quarterly Return, Label | rr_HighestQuarterlyReturnLabel | Best Quarter | |||||||
| Highest Quarterly Return, Date | rr_BarChartHighestQuarterlyReturnDate | Jun. 30, 2020 | |||||||
| Highest Quarterly Return | rr_BarChartHighestQuarterlyReturn | 15.51% | |||||||
| Lowest Quarterly Return, Label | rr_LowestQuarterlyReturnLabel | Worst Quarter | |||||||
| Lowest Quarterly Return, Date | rr_BarChartLowestQuarterlyReturnDate | Mar. 31, 2020 | |||||||
| Lowest Quarterly Return | rr_BarChartLowestQuarterlyReturn | (23.49%) | |||||||
| 1 Year | rr_AverageAnnualReturnYear01 | 12.73% | |||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 3.95% | |||||||
| Since Inception | rr_AverageAnnualReturnSinceInception | 5.77% | [1] | ||||||
| Inception Date | rr_AverageAnnualReturnInceptionDate | Dec. 21, 2015 | |||||||
| Class Z Shares | International Strategic Equities Portfolio | Return After Taxes on Distributions | Class Z | |||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||
| 1 Year | rr_AverageAnnualReturnYear01 | 11.99% | |||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 3.25% | |||||||
| Since Inception | rr_AverageAnnualReturnSinceInception | 5.16% | [1] | ||||||
| Inception Date | rr_AverageAnnualReturnInceptionDate | Dec. 21, 2015 | |||||||
| Class Z Shares | International Strategic Equities Portfolio | Return After Taxes on Distributions and Sale of Portfolio Shares | Class Z | |||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||
| 1 Year | rr_AverageAnnualReturnYear01 | 7.89% | |||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 3.10% | |||||||
| Since Inception | rr_AverageAnnualReturnSinceInception | 4.64% | [1] | ||||||
| Inception Date | rr_AverageAnnualReturnInceptionDate | Dec. 21, 2015 | |||||||
| Class Z Shares | International Strategic Equities Portfolio | MSCI ACWI ex USA Index (reflects no deduction for fees, expenses, or taxes) | |||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||
| 1 Year | rr_AverageAnnualReturnYear01 | 5.53% | |||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 4.10% | |||||||
| Since Inception | rr_AverageAnnualReturnSinceInception | 6.20% | [1] | ||||||
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