S000034947 [Member] Investment Risks - AB Select US Equity Portfolio
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Jun. 30, 2026 |
| Sector Risk [Member] |
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| Prospectus [Line Items] |
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| Risk [Text Block] |
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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 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. |
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| Capitalization Risk [Member] |
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Capitalization
Risk: Investments in small- and mid‑capitalization companies may be more volatile than investments in large-capitalization
companies. Investments in these companies may have additional risks because these companies may have limited product lines, markets or
financial resources. |
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| Active Trading Risk [Member] |
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| Prospectus [Line Items] |
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Active
Trading Risk: The Fund expects to engage in active and frequent trading of its portfolio securities and its portfolio turnover
rate may greatly exceed 100%. A higher rate of portfolio turnover increases transaction costs, which may negatively affect the Fund’s
return. In addition, a high rate of portfolio turnover may result in substantial short-term gains, which may have adverse tax consequences
for Fund shareholders. |
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| IPO Risk [Member] |
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IPO
Risk: Securities purchased in an IPO may be subject to substantial price volatility due to one or more factors such as unseasoned
trading in the securities, the lack of investor knowledge of the issuer, the lack of an operating history of the issuer, and the dependence
of the issuer on key personnel, suppliers or a limited number of customers. |
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| Capital Gain Risk [Member] |
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| Prospectus [Line Items] |
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Capital
Gain Risk: As of the date of this Prospectus, a substantial portion of the Fund’s net asset value is attributable to realized
and/or net unrealized capital gains on portfolio securities. If the Fund realizes capital gains in excess of realized capital losses in
any fiscal year, it generally expects to make capital gain distributions to shareholders. You may receive distributions that are attributable
to appreciation of portfolio securities that happened before you made your investment. Unless you purchase shares through a tax‑advantaged
account (such as an IRA or 401(k) plan), these distributions will be taxable to you even though they economically represent a return of
a portion of your investment. You should consult your tax professional about your investment in the Fund. |
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| Management Risk [Member] |
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| Prospectus [Line Items] |
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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. |
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| Market Risks [Member] |
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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 local, regional
or global events, including public health crises (including the occurrence of a contagious disease or illness), terrorism, war, changing
interest rate levels, the imposition of new or additional tariffs, or global conflicts, any of which can affect large portions of the
securities markets. It includes the risk that a particular style of investing may be underperforming the market generally. |
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| Risk Lose Money [Member] |
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| Prospectus [Line Items] |
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As with all investments, you may lose
money by investing in the Fund.
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