v3.26.3
Investment Risks
Jun. 30, 2026
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] There is no assurance that the Fund will achieve its investment objectives, and you could lose part or all of your investment in the Fund.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items]  
Risk [Text Block] An investment in the Fund is not a deposit with a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Allocation Risk  
Prospectus [Line Items]  
Risk [Text Block]
Allocation Risk
The allocations among strategies, asset classes and market exposures may be less than optimal and may adversely affect the Fund’s performance. There can be no assurance, particularly during periods of market disruption and stress, that judgments about allocations will be correct. The Fund’s allocations may be invested in strategies, asset classes and market exposures during a period when such strategies, asset classes and market exposures underperform.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Callable Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]
Callable Securities Risk
The Fund may invest in fixed-income securities with call features. A call feature allows the issuer of the security to redeem or call the security prior to its stated maturity date. In periods of falling interest rates, issuers may be more likely to call in securities that are paying higher coupon rates than prevailing interest rates. In the event of a call, the Fund would lose the income that would have been earned to maturity on that security, and the proceeds received by the Fund may be invested in securities paying lower coupon rates and may not benefit from any increase in value that might otherwise result from declining interest rates.  
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Convertible Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]
Convertible Securities Risk
The value of a convertible security, including a convertible preferred security, typically increases or decreases with the price of the underlying common stock. In general, a convertible security is subject to the market risks of stocks when the underlying stock’s price is high relative to the conversion price and is subject
to the market risks of debt securities when the underlying stock’s price is low relative to the conversion price. The general market risks of debt securities that are common to convertible securities include, but are not limited to, interest rate risk and credit risk. Many convertible securities have credit ratings that are below investment grade and are subject to the same risks as an investment in below investment grade debt securities (commonly known as “junk bonds”). Lower-rated debt securities may fluctuate more widely in price and yield than investment grade debt securities and may fall in price during times when the economy is weak or is expected to become weak. Convertible securities are subject to the risk that the credit standing of the issuer may have an effect on the convertible security‘s investment value. In addition, to the extent the Fund invests in convertible securities issued by small- or mid-capitalization companies, it will be subject to the market risks of investing in such companies. The stocks of small- and mid-capitalization companies may fluctuate more widely in price than the market as a whole and there may also be less trading in small- or mid-capitalization stocks. Convertible securities are sensitive to movement in interest rates.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Counterparty Risk  
Prospectus [Line Items]  
Risk [Text Block]
Counterparty Risk
The Fund is subject to the risk that a party or participant to a transaction, such as a broker or a derivative counterparty, will be unwilling or unable to satisfy its obligation to make timely principal, interest or settlement payments or to otherwise honor its obligations to the Fund.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Credit Risk  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk
The Fund is subject to the risk that the issuer, guarantor or insurer of an obligation, or the counterparty to a transaction, may fail, or become less able or unwilling, to make timely payment of interest or principal or otherwise honor its obligations or default completely. Changes in the actual or perceived creditworthiness of an issuer, or a downgrade or default affecting any of the Fund’s securities, could affect the Fund’s performance. Generally, the longer the maturity and the lower the credit quality of a security, the more sensitive it is to credit risk.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Currency Risk  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk
The Fund may have exposure to foreign currencies. Foreign currencies may fluctuate significantly over short periods of time, may be affected unpredictably by intervention, or the failure to intervene, of the  U.S. or foreign governments or central banks, and may be affected by currency controls or political developments in the U.S. or abroad. Foreign currencies may also decline in value relative to the U.S. dollar and other currencies and thereby affect the Fund’s investments.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Cybersecurity and Operational Risk  
Prospectus [Line Items]  
Risk [Text Block]
Cybersecurity and Operational Risk
Operational risks arising from, among other problems, human errors, systems and technology disruptions or failures, or cybersecurity incidents may negatively impact the Fund, its service providers and third-party fund distribution platforms, including the ability of shareholders to transact in the Fund’s shares, and result in financial losses. Cybersecurity incidents may allow an unauthorized party to gain access to Fund assets, shareholder data, or proprietary information, or cause the Fund or its service providers, as well as securities trading venues and their service providers, to suffer data corruption or lose operational functionality. Cybersecurity incidents can result from deliberate attacks or unintentional events. It is not possible for the Fund or its service providers to identify all of the operational risks that may affect the Fund or to develop processes and controls to completely eliminate or mitigate their occurrence or effects. The Fund cannot control the cybersecurity and operational plans and systems of its service providers, its counterparties or the issuers of securities in which the Fund invests. The issuers of the Fund’s investments are likely to be dependent on computers for their operations and require ready access to their data and the internet to conduct their business. Thus, cybersecurity incidents could also affect issuers of the Fund’s investments, leading to significant loss of value.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Debentures Risk  
Prospectus [Line Items]  
Risk [Text Block]
Debentures Risk
Debentures are unsecured debt securities. The holder of a debenture is protected only by the general creditworthiness of the issuer. The Fund may invest in both corporate and government debentures.  
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Derivatives Risk  
Prospectus [Line Items]  
Risk [Text Block]
Derivatives Risk
Derivatives may involve significant risk. The use of derivative instruments may expose the Fund to additional risks that it would not be subject to if it invested directly in the securities or other instruments underlying those derivatives, including the high degree of leverage often embedded in such instruments, and potential material and prolonged deviations between the theoretical value and realizable value of a derivative. Some derivatives have the potential for unlimited loss, regardless of the size of the Fund’s initial investment.   The use of derivatives may also increase any adverse effects resulting from the underperformance of strategies, asset classes and market exposures to which the Fund has allocated its assets. Derivatives may at times be highly illiquid, and the Fund may not be able to close out or sell a derivative at a particular time or at an anticipated price. Certain derivatives may be difficult to value, and valuation may be more difficult in times of market turmoil. Derivatives may also be more volatile than other types of investments. Derivative investments can increase portfolio turnover and transaction costs. Derivatives also are subject to counterparty risk  and credit risk. As a result, the Fund may not recover its investment or may only obtain a limited recovery, and any recovery may be delayed.  Not all derivative transactions require a counterparty to post collateral, which may expose the Fund to greater losses in the event of a default by a counterparty. Derivatives transactions requiring the Fund to post collateral may expose the Fund to greater losses in the event of a default by a counterparty.  There may be imperfect correlation between the behavior of a derivative and that of the reference instrument underlying the derivative. An abrupt change in the price of a reference instrument could render a derivative worthless. Derivatives may involve risks different from, and possibly greater than, the risks associated with investing directly in the reference instrument. The Fund may buy or sell derivatives not traded on an exchange, which may be subject to heightened  counterparty, liquidity and valuation risks. Suitable derivatives may not be available in all circumstances, and there can be no assurance that the Fund will use derivatives to reduce exposure to other risks when that might have been beneficial. Ongoing changes to the regulation of derivatives and changes in the regulation of funds using derivative instruments could limit the Fund’s ability to pursue its investment strategies. New regulation of derivatives may make them more costly, or may otherwise adversely affect their liquidity, value or performance.  In addition, the Fund’s investments in derivatives are subject to the following risks:
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Forward Contracts Risk. Forward contracts are derivative instruments pursuant to a contract where the parties agree to a fixed price for an agreed amount of securities or other underlying assets at an agreed date or to buy or sell a specific currency at a future date at a price set at the time of the contract. Not all forward contracts, including  NDFs, require a counterparty to post collateral, which may expose the Fund to greater losses in the event of a default by a counterparty. Forward contracts involving currency include the risks associated with fluctuations in currency. The use of forward contracts may expose the Fund to additional risks, such as credit risk, liquidity risk, and counterparty risk, that it would not be subject to if it invested directly in the securities or currencies underlying the forward contract.  There are no limitations on daily price movements of forward contracts. There can be no assurance that any strategy used will succeed.
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Foreign Currency Forward Contracts Risk. Foreign currency forward contracts, including non-deliverable forwards (“NDFs”), are derivative instruments pursuant to a contract where the parties agree to a fixed price for an agreed amount of foreign currency at an agreed date or to buy or sell a specific currency at a future date at a price set at the time of the contract and include the risks associated with fluctuations in currency. There are no limitations on daily price movements of forward contracts. There can be no assurance that any strategy used will succeed. Not all forward contracts, including NDFs, require a counterparty to post collateral, which may expose the Fund to greater losses in the event of a default by a counterparty. The use of foreign currency forward contracts may expose the Fund to additional risks, such as credit risk, liquidity risk, and counterparty risk, that it would not be subject to if it invested directly in the securities or currencies underlying the foreign currency forward contract. There are no limitations on daily price movements of forward contracts. There can be no assurance that any strategy used will succeed.
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Futures Contracts Risk. Futures contracts are derivative instruments pursuant to a contract where the parties agree to a fixed price for an agreed amount of securities or other underlying assets at an agreed date. The use of such derivative instruments may expose the Fund to additional risks, such as liquidity risk and counterparty risk, that it would not be subject to if it invested directly in the securities underlying those derivatives. There can be no assurance that any strategy used will succeed. There may at times be an imperfect correlation between the movement in the prices of futures contracts and the value of their underlying instruments or indexes. There also can be no assurance that, at all times, a liquid market will exist for offsetting a futures contract that the Fund has previously bought or sold, and this may result in the inability to close a futures contract when desired. Futures contracts may experience potentially dramatic price changes, which will increase the volatility of the Fund and may involve a small investment of cash (the amount of initial and variation margin) relative to the magnitude of the risk assumed (the potential increase or decrease in the price of the futures contract). The Fund may invest in the following types of futures contracts:
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Foreign Currency Futures Contracts Risk. Foreign currency futures contracts are derivative instruments pursuant to a contract where the parties agree to pay a fixed price for an agreed amount of foreign currency at an agreed date or to buy or sell a specific currency at a future date at a price set at the time of the contract. Foreign currency futures contracts are similar to foreign currency forward contracts, except that they are traded on exchanges (and may have margin requirements) and are standardized as to contract size and delivery date. The Fund may use foreign currency futures contracts for the same purposes as foreign currency forward contracts, subject to Commodity Futures Trading Commission (“CFTC”) regulations. The use of foreign currency futures contracts may expose the Fund to additional risks, such as liquidity risk and counterparty risk, that it would not be subject to if it invested directly in the currencies underlying the foreign currency futures contract. Foreign currency futures transactions and currency futures contracts include risks associated with fluctuations in currency, and other risks inherent in trading derivatives. There can be no assurance that a liquid secondary market will be available to the Fund for the appropriate type of contract at any particular time. Consequently, the Fund may experience losses if it is unable to timely exit its position due to an illiquid secondary market.
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Treasury Futures Contracts Risk. Treasury futures contracts expose the Fund to price fluctuations resulting from changes in interest rates and to potential losses if interest rates do not move as expected.
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Options Risk. An option is a contract that gives the purchaser (holder) of the option, in return for a premium, the right to buy from (call) or sell to (put) the seller (writer) of the option the asset underlying the option at a specified exercise price at any time during the term of the option (normally not exceeding nine months).  The Fund may use non-deliverable options (“NDOs”) in particular situations when physical delivery of the underlying asset is not required or not possible. There can be no guarantee that the use of options will increase the Fund’s return or income. In addition, there may be an imperfect correlation between the movement in prices of options and the assets underlying them, and there may at times not be a liquid secondary market for options. If an option that the Fund has purchased expires unexercised, the Fund will experience a loss in the amount of the premium it paid. In order for a call option to be profitable, the market price of the underlying asset must rise sufficiently above the call option exercise price to cover the premium and any transaction costs. These costs will reduce any profit that might otherwise have been realized had the Fund bought the underlying asset instead of the call option. In order for a put option to be profitable, the market price of the underlying asset must decline sufficiently below the put option’s exercise price to cover the premium and any transaction costs. By using put options in this manner, the Fund will reduce any profit it might otherwise have realized from having shorted the declining underlying asset by the premium paid for the put option and by transaction costs.
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Swap Agreements Risk. Swap agreements or “swaps” are transactions in which the Fund and a counterparty agree to pay or receive payments at specified dates based upon or calculated by reference to changes in specified prices or rates or the performance of specified securities, indices or other assets based on a specified amount (the “notional” amount). Swaps can involve greater risks than a direct investment in an underlying asset, because swaps typically include a certain amount of embedded leverage and as such are subject to leverage risk.   If swaps are used as a hedging strategy, the Fund is subject to the risk that the hedging strategy may not eliminate the risk that it is intended to offset, due to, among other reasons, the occurrence of unexpected price movements or the non-occurrence of expected price movements.   Swaps also may be difficult to value. Swaps may be subject to liquidity risk and counterparty risk, and swaps that are traded over-the-counter are not subject to standardized clearing requirements and may involve greater liquidity and counterparty risks.   The Fund may invest in the following types of swaps:
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Credit Default Swaps Risk. Credit default swaps may also be subject to credit risk and the risks associated with the purchase and sale of credit protection.
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Interest Rate Swaps Risk. Interest rate swaps may also be subject to interest rate and market risks.  
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Warrants Risk. Warrants are derivative securities that give the holder the right to purchase a specified amount of securities at a specified price. Warrants may be more speculative than certain other types of investments because warrants do not carry with them dividend or voting rights with respect to the underlying securities, or any rights in the assets of the issuer. In addition, the value of a warrant does not necessarily change with the value of the underlying securities, and a warrant ceases to have value if it is not exercised prior to its expiration date. The market for warrants may be very limited and there may at times not be a liquid secondary market for warrants.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Dividend Risk  
Prospectus [Line Items]  
Risk [Text Block]
Dividend Risk
An issuer of stock held by the Fund may choose not to declare a dividend or the dividend rate might not remain at current levels or increase over time. Dividend paying stocks might not experience the same level of earnings growth or capital appreciation as non-dividend paying stocks. Securities that pay dividends may be sensitive to changes in interest rates and, as interest rates rise or fall, the prices of such securities may fall.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Emerging Markets Risk  
Prospectus [Line Items]  
Risk [Text Block]
Emerging Markets Risk
When investing in emerging markets, the risks of investing in foreign securities are heightened. Emerging markets are generally smaller, less developed, less liquid and more volatile than the securities markets of the U.S. and other developed markets. There are also risks of: greater political or economic uncertainties; an economy’s dependence on revenues from particular commodities or on international aid or development assistance; currency transfer restrictions; a limited number of potential buyers for such securities resulting in increased volatility and limited liquidity for emerging market securities; trading suspensions and other restrictions on investment; delays and disruptions in securities clearing and settlement procedures; and significant limitations on investor rights and recourse. The governments of emerging market countries may also be more unstable and more likely to impose capital controls, nationalize a company or industry, place restrictions on foreign ownership and on withdrawing sale proceeds of securities from the country, intervene in the financial markets, and/or impose burdensome taxes that could adversely affect security prices. In addition, there may be less publicly available information about issuers in emerging markets than would be available about issuers in more developed capital markets, and such issuers may not be subject to accounting, auditing, financial reporting and recordkeeping standards and requirements comparable to those to which U.S. companies are subject.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Equity Investments Risk  
Prospectus [Line Items]  
Risk [Text Block]
Equity Investments Risk
Equity securities represent ownership interests in companies and are subject to investment risk, issuer risk and market risk. In general, the values of stocks and other equity securities fluctuate, and sometimes widely fluctuate, in response to changes in a company’s financial condition as well as general market, economic and political conditions and other factors. The Fund may experience a significant or complete loss on its investment in an equity security. In addition, stock prices may be particularly sensitive to rising interest rates, which increase borrowing costs and the costs of capital.  The Fund may invest in the following equity securities, which may expose the Fund to the following additional risks:
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Common Stock Risk. The value of a company’s common stock may fall as a result of factors affecting the company, companies in the same industry or sector, or the financial markets overall. Common stock generally is subordinate to preferred stock upon the liquidation or bankruptcy of the issuing company.
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Depositary Receipts and/or U.S. Dollar-Denominated Foreign Stocks Traded on U.S. Exchanges Risk. Depositary receipts and U.S. dollar-denominated foreign stocks traded on U.S. exchanges are subject to certain of the risks associated with investing directly in foreign securities, including, but not limited to, currency exchange rate fluctuations, political and financial instability in the home country of a particular depositary receipt or foreign stock, less liquidity, more volatility, less government regulation and supervision and delays in transaction settlement.
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Real Estate Investment Trusts (“REITs”) Risk. Investments in REITs are subject to the risks associated with investing in the real estate industry, including, among other risks: adverse developments affecting the real estate industry; declines in real property values; changes in interest rates; defaults by mortgagors or other borrowers and tenants; lack of availability of mortgage funds or financing; extended vacancies of properties, especially during economic downturns; casualty or condemnation losses; regulatory limitations on rents and operating expenses; and other governmental actions, such as changes to tax laws, zoning regulations or environmental regulations. REITs also are dependent upon the skills of their managers and are subject to heavy cash flow dependency or self-liquidation. Regardless of where a REIT is organized or traded, its performance may be affected significantly by events in the region where its properties are located. REITs may not be diversified geographically or by property or tenant type. Domestic REITs could be adversely affected by failure to qualify for tax-free “pass-through” of distributed net income and net realized gains under the Internal Revenue Code of 1986, as amended (“Internal Revenue Code”), or to maintain their exemption from registration under the Investment Company Act of 1940, as amended (“Investment Company Act”). REITs typically incur fees that are separate from those incurred by the Fund. Accordingly, the Fund’s investment in REITs will result in the layering of expenses such that shareholders will indirectly bear a proportionate share of the REITs’ operating expenses, in addition to paying Fund expenses. The value of REIT common stock may decline when interest rates rise.  Publicly traded REITs may typically trade in wider spreads depending on market conditions. REITs tend to be small- to mid-capitalization securities and, as such, are subject to the risks of investing in small- to mid-capitalization securities.  
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Foreign Investing Risk  
Prospectus [Line Items]  
Risk [Text Block]
Foreign Investing Risk
Non-U.S. investments carry potential risks not associated with U.S. investments. Such risks may include, but are not limited to: (1) currency exchange rate fluctuations, (2) political and financial instability, (3) less liquidity, (4) lack of uniform accounting, auditing, recordkeeping and financial reporting standards, (5) greater volatility, (6) different government regulation and supervision of foreign stock exchanges, brokers and listed companies, and (7) delays or failures in transaction payment and settlement in some foreign markets. Additionally, trading in foreign markets generally involves higher transaction costs than trading in U.S. markets. The Fund’s investment in a foreign issuer may subject the Fund to regulatory, political, currency, security, economic and other risks associated with that country, including tariffs, trade disputes and sanctions. Global economic and financial markets have become increasingly interconnected and conditions (including recent volatility, terrorism, war and political instability) and events (including natural disasters) in one country, region or financial market may adversely impact issuers in a different country, region or financial market.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Hedging Risk  
Prospectus [Line Items]  
Risk [Text Block]
Hedging Risk
If the Fund uses a hedging instrument at the wrong time or judges the market conditions incorrectly, or the hedged instrument does not correlate to the risk sought to be hedged, the hedge might be unsuccessful, reduce the Fund’s return, or create a loss. In addition, hedges, even when successful in mitigating risk, may not prevent the Fund from experiencing losses on its investments. Hedging instruments may also reduce or eliminate gains that may otherwise have been available had the Fund not used the hedging instruments.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | High Portfolio Turnover Risk  
Prospectus [Line Items]  
Risk [Text Block]
High Portfolio Turnover Risk
Portfolio turnover is a measure of the Fund’s trading activity over a one-year period. A portfolio turnover rate of 100% would indicate that the Fund sold and replaced the entire value of its securities holdings during the period. The Fund may engage in active and frequent trading and may have a high portfolio turnover rate, which could increase the Fund’s transaction costs, have a negative impact on performance, and generate higher capital gain distributions to shareholders than if the Fund had a lower portfolio turnover rate.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | High-Yield Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]
High-Yield Securities Risk
Exposure to high-yield, below investment-grade securities (commonly referred to as “junk bonds”) generally involves significantly greater risks than an investment in investment grade securities. High-yield debt securities may fluctuate more widely in price and yield and may fall in price when the economy is weak or expected to become weak. These securities also may be difficult to sell at the time and price the Fund desires. High-yield securities are considered to be speculative with respect to an issuer’s ability to pay interest and principal and carry a greater risk that the issuers of lower-rated securities will default on the timely payment of principal and interest. High-yield securities may experience greater price volatility and less liquidity than investment grade securities. Issuers of securities that are in default or have defaulted may fail to resume principal or interest payments, in which case the Fund may lose its entire investment.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Interest Rate Risk  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk
Generally, the value of investments with interest rate risk, such as fixed-income securities or derivatives, will move in the opposite direction as movements in interest rates. Factors including central bank monetary policy, rising inflation rates, and changes in general economic conditions may cause interest rates to rise, which could cause the value of the Fund’s investments to decline. Additionally, the value of income-oriented equity securities that pay dividends may decline when interest rates rise, as rising interest rates can reduce companies’ profitability and their ability to pay dividends. Interest rate increases, including significant or rapid increases, may result in a decline in the value of investments   or derivatives held by the Fund, make issuers less willing or able to make principal and interest payments on fixed-income investments when due, lead to heightened volatility in the fixed-income markets and adversely affect the liquidity of certain fixed-income investments, any of which may result in substantial losses to the Fund.     When interest rates decline, issuers may prepay higher-yielding securities held by the Fund, resulting in the Fund reinvesting in securities with lower yields, which may cause a decline in its income.   Interest rate changes may have a more pronounced effect on the market value of fixed-rate instruments than on floating-rate instruments. The value of floating rate and variable securities may decline if their interest rates do not rise as quickly, or as much, as general interest rates. The prices of fixed-income securities  or derivatives are also affected by their  durations. Fixed-income securities or derivatives with longer durations generally have greater sensitivity to changes in interest rates than those with shorter durations. Rising interest rates may cause the value of the Fund’s investments with longer durations and terms to maturity to decline, which may adversely affect the value of the Fund. For example, if a bond has a duration of eight years, a 1% increase in interest rates could be expected to result in an 8% decrease in the value of the bond. Fluctuations in interest rates may also affect the liquidity of fixed-income securities and instruments held by the Fund.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Investment Risk  
Prospectus [Line Items]  
Risk [Text Block]
Investment Risk
An investment in the Fund is not a deposit with a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. When you sell your shares of the Fund, they could be worth less than what you paid for them. Therefore, you may lose money by investing in the Fund.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Issuer Risk  
Prospectus [Line Items]  
Risk [Text Block]
Issuer Risk
The value of, and/or the return generated by, a security may decline for a number of reasons that directly relate to the issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods or services, as well as the historical and prospective earnings of the issuer and the value of its assets.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Large-Capitalization Companies Risk  
Prospectus [Line Items]  
Risk [Text Block]
Large-Capitalization Companies Risk
The securities of large market capitalization companies may underperform other segments of the market because such companies may be less responsive to competitive challenges and opportunities and, at times, such companies may be out of favor with investors. Many larger-capitalization companies also may be unable to attain the high growth rates of successful smaller companies, especially during periods of economic expansion.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Liquidity Risk  
Prospectus [Line Items]  
Risk [Text Block]
Liquidity Risk
The Fund is susceptible to the risk that certain investments held by the Fund may have limited marketability, be subject to restrictions on sale, be difficult or impossible to purchase or sell at favorable times or prices or become less liquid in response to market developments or adverse credit events that may affect issuers or guarantors of a security. An inability to sell a portfolio position can adversely affect the Fund’s value or prevent the Fund from being able to take advantage of other investment opportunities. Market prices for such instruments may be volatile. During periods of substantial market volatility, an investment or even an entire market segment may become illiquid, sometimes abruptly, which can adversely affect the Fund’s ability to limit losses. The Fund could lose money if it is unable to dispose of an investment at a time that is most beneficial to the Fund. The Fund may be required to dispose of investments at unfavorable times or prices to satisfy obligations, which may result in losses or may be costly to the Fund.   Unexpected redemptions may force the Fund to sell certain investments at unfavorable prices to meet redemption requests or other cash needs.  Judgment plays a greater role in pricing illiquid investments than in investments with more active markets.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Market Risk  
Prospectus [Line Items]  
Risk [Text Block]
Market Risk
The Fund is subject to the risk that the securities markets will move down, sometimes rapidly and unpredictably, based on overall economic conditions and other factors, which may negatively affect the Fund’s performance. The financial markets generally move in cycles, with periods of rising prices followed by periods of declining prices. The value of your investment may reflect these fluctuations. During a general downturn in the securities markets, multiple asset classes may decline in value simultaneously. Even when certain securities prices have generally increased over time, there have been periods of price decreases during those times, resulting in losses for investors, which are likely to occur again in the future.
Geopolitical and other events, including war, terrorism, trade disputes, pandemics, public health crises, natural disasters, and  cybersecurity incidents, have led, and in the future may continue to lead, to general instability in world economies and markets and reduced liquidity in securities, which may negatively affect the value of your investment.
Policies established by the  U.S. government and/or Federal Reserve and economic and political circumstances within the U.S. and abroad, such as inflation, changes in interest rates, recessions, changes in government leadership, a government’s inability to agree on a budget, high public debt, the threat or occurrence of a federal government shutdown and threats or the occurrence of a failure to increase the federal government’s debt limit, which could result in a default on the government’s obligations, may negatively affect investor and consumer confidence and may negatively impact financial markets and the broader economy, perhaps suddenly and to a significant degree.
Markets and market participants are increasingly reliant upon public and proprietary data and systems. Data or technology malfunctions and inaccuracies may disrupt markets and lead to negative consequences for market participants like the Fund.  
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Recent Market Events Risk. Both U.S. and international markets have experienced significant volatility in recent months and years. As a result of such volatility, investment returns may fluctuate significantly. Moreover, during periods of significant volatility, the risks discussed herein associated with an investment in the Fund may be increased. National economies are substantially interconnected, as are global financial markets, which creates the possibility that conditions in one country or region might adversely impact issuers in a different country or region. However, the interconnectedness of economies and/or markets may be changing, which may impact such economies and markets in ways that cannot be foreseen at this time.
Some countries, including the  U.S., have adopted more protectionist trade policies, including trade tariffs and other trade barriers, which is a trend that appears to be continuing globally. The economies of all nations, including the U.S., are subject to the risks of slowing global economic growth, protectionist trade policies, inflationary pressures, limits imposed by international trade and security agreements, political or economic dysfunction, poor consumer sentiment, and reduced demand for goods due to fluctuating commodity prices and currency values, and these risks may create significant market volatility in ways that cannot be foreseen at the present time. These economic risks could have a negative impact on the Fund’s investments.
The U.S. Federal Reserve and certain foreign central banks may raise or lower interest rates in response to economic or other factors, including inflation. It is difficult to accurately predict the various economic and political factors that influence interest rate changes, including the direction, pace, timing, frequency or magnitude of any such changes in interest rates. Changes in interest rates could lead to an economic slowdown in the U.S. and abroad, significant market volatility and reduced liquidity in certain sectors of the market.
Tensions, war, or open conflict between nations, such as among the United States, Israel and Iran, between Russia and Ukraine, otherwise in the Middle East or in eastern Asia could affect the economies of many nations, including the United States and may contribute to increased volatility and uncertainty in the financial markets. The extent and duration of ongoing hostilities and related sanctions and the repercussions of such events cannot be predicted. Those events have presented and could continue to present material uncertainty and risk with respect to markets globally, including in the oil and gas markets and potentially other industries and sectors, and the performance of the Fund and its investments or operations could be negatively impacted.  
Advancements in technology, including advanced development and increased regulation of artificial intelligence, may adversely impact market movements and liquidity. As artificial intelligence is used more widely, which can occur relatively rapidly, the profitability and growth of certain issuers and industries may be negatively impacted in ways that cannot be foreseen and could adversely impact issuer and market performance. As a consequence, the Fund’s holdings and its overall performance could be negatively impacted.
Global climate change may affect property and security values. Certain issuers, industries and regions may be adversely affected by the impacts of climate change in ways that cannot be foreseen. The impacts of legislation, regulation and international accords related to climate change, as well as any indirect consequences that may not be foreseen, may negatively impact certain issuers, industries and regions.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Market Direction Risk  
Prospectus [Line Items]  
Risk [Text Block]
Market Direction Risk
Since the Fund will typically hold both long and short positions, an investment in the Fund will involve market risks associated with different types of investment decisions than those made for a typical “long only” fund. The Fund’s results could suffer both when there is a general market advance and the Fund holds significant “short” positions, and when there is a general market decline and the Fund holds significant “long” positions.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Market Timing Risk  
Prospectus [Line Items]  
Risk [Text Block]
Market Timing Risk
The Fund is subject to the risk of market timing activities by investors due to the nature of the Fund’s investments, which requires the Fund, in certain instances, to fair value certain of its investments. Some investors may engage in frequent short-term trading in the Fund to take advantage of any price
differentials that may be reflected in the net asset value (“NAV”) of the Fund’s shares. Frequent trading by Fund shareholders poses risks to other shareholders in the Fund, including (i) the dilution of the Fund’s NAV, (ii) an increase in the Fund’s expenses, and (iii) interference with the ability to execute efficient investment strategies.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Mid-Capitalization Companies Risk  
Prospectus [Line Items]  
Risk [Text Block]
Mid-Capitalization Companies Risk
Investing in the securities of mid-capitalization companies involves greater risk and the possibility of greater price volatility, which at times can be rapid and unpredictable, than investing in larger-capitalization and more established companies. Since mid-capitalization companies may have narrower commercial markets and more limited operating history, product lines, and managerial and financial resources than larger, more established companies, the securities of these companies may lack sufficient market liquidity, and they can be particularly sensitive to changes in overall economic conditions, interest rates, borrowing costs and earnings.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Other Investment Companies Risk  
Prospectus [Line Items]  
Risk [Text Block]
Other Investment Companies Risk
To the extent that the Fund invests in shares of other registered investment companies, the Fund will indirectly bear the fees and expenses charged by those investment companies in addition to the Fund’s direct fees and expenses. To the extent the Fund invests in other investment companies that invest in equity securities, fixed-income securities and/or foreign securities, or that track an index, the Fund is subject to the risks associated with the underlying investments held by the investment company or the index fluctuations to which the investment company is subject. The Fund may invest in securities of an investment company advised by the Manager and/or a sub-advisor, with respect to which the Manager and/or sub-advisor also receives a management or advisory fee. The Manager and/or sub-advisor has a financial incentive to invest in an affiliated rather than unaffiliated investment company and thus has a potential conflict between its own financial interest and the Fund’s interest. The Fund will be subject to the risks associated with investments in those companies, including but not limited to the following:
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Exchange-Traded Funds (“ETFs”) Risk. Because ETFs are listed on an exchange, they may be subject to trading halts, may trade at a premium or discount to their net asset value (“NAV”) and may not be liquid. An ETF that tracks an index may not precisely replicate the returns of that index, and an actively-managed ETF’s performance will reflect its adviser’s ability to make investment decisions that are suited to achieving the ETF’s investment objectives. Future legislative or regulatory changes, including changes in taxation, could impact the operation of ETFs.   
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Government Money Market Funds Risk. Investments in government money market funds are subject to interest rate risk, credit risk, and market risk.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Preferred Stock Risk  
Prospectus [Line Items]  
Risk [Text Block]
Preferred Stock Risk
Preferred stocks are sensitive to movements in interest rates. Preferred stocks may be less liquid than common stocks and, unlike common stocks, participation in the growth of an issuer may be limited. Distributions on preferred stocks generally are payable at the discretion of an issuer and after required payments to bond holders. In certain situations, an issuer may call or redeem its preferred stock or convert it to common stock. The market prices of preferred stocks are generally more sensitive to actual or perceived changes in the issuer’s financial condition or prospects than are the prices of debt securities.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Redemption Risk  
Prospectus [Line Items]  
Risk [Text Block]
Redemption Risk
The Fund may experience periods of high levels of redemptions that could cause the Fund to sell assets at inopportune times or at a loss or depressed value. Heavy redemptions could hurt the Fund’s performance. The sale of assets to meet redemption requests may create net capital gains, which could cause the Fund to have to distribute substantial capital gains. Redemption risk is greater to the extent that one or more investors or intermediaries control a large percentage of investments in the Fund. In addition, redemption risk is heightened during periods of declining or illiquid markets. A rise in interest rates or other market developments may cause investors to move out of fixed-income securities on a large scale. During periods of heavy redemptions, the Fund may borrow funds through the interfund credit facility or from a bank line of credit, which may increase costs.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Reliance on Corporate Management and Financial Reporting Risk  
Prospectus [Line Items]  
Risk [Text Block]
Reliance on Corporate Management and Financial Reporting  Risk
The sub-advisor may select investments for the Fund in part on the basis of information and data made directly available to the sub-advisor by the issuers of securities or through sources other than the issuers such as collateral pool servicers. The sub-advisor has no ability to independently verify such information and data and is therefore dependent upon the integrity of the management of these issuers and of such servicers and the financial and collateral performance reporting processes in general. Information and data provided regarding a particular issuer may not necessarily contain information that the sub-advisor normally considers when evaluating the investment prospects of a company.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Restricted Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]
Restricted Securities Risk
Securities not registered in the U.S. under the Securities Act of 1933, as amended (the “Securities Act”), or in non-U.S. markets pursuant to similar regulations, including “Section 4(a)(2)” securities and “Rule 144A” securities, are restricted as to their resale. Such securities may not be listed on an exchange and may have no active trading market. The prices of these securities may be more difficult to determine than publicly traded securities and these securities may involve heightened risk as compared to investments in securities of publicly traded companies. They may be more difficult to purchase or sell at an advantageous time or price because such securities may not be readily marketable in broad public markets or may have to be held for a certain time period before they can be resold. The Fund may not be able to sell a restricted security when the sub-advisor considers it desirable to do so and/or may have to sell the security at a lower price than the Fund believes is its fair market value. In addition, transaction costs may be higher for restricted securities and the Fund may receive only limited information regarding the issuer of a restricted security. The Fund may have to bear the expense of registering restricted securities for resale and the risk of substantial delays in effecting the registration.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Secured, Partially Secured and Unsecured Obligation Risk  
Prospectus [Line Items]  
Risk [Text Block]
Secured, Partially Secured and Unsecured Obligation Risk
Debt obligations may be secured, partially secured or unsecured. Interests in secured and partially-secured obligations have the benefit of collateral and, typically, of restrictive covenants limiting the ability of the borrower to further encumber its assets. However, there is no assurance that the liquidation of collateral from a secured or partially-secured obligation would satisfy the borrower’s obligation, or that the collateral can be liquidated. Furthermore, there is a risk that the value of any collateral securing an obligation in which the Fund has an interest may decline and that the collateral may not be sufficient to cover the amount owed on the obligation. In the event the borrower defaults, the Fund’s access to the collateral may be limited or delayed by bankruptcy or other insolvency laws. Unsecured debt, including senior unsecured and subordinated debt, will not be secured by any collateral and will be effectively subordinated to a borrower’s secured indebtedness (to the extent of the collateral securing such indebtedness). With respect to unsecured obligations, the Fund lacks any collateral on which to foreclose to satisfy its claim in whole or in part. Such instruments generally have greater price volatility than that of fully secured holdings and may be less liquid.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Securities Selection Risk  
Prospectus [Line Items]  
Risk [Text Block]
Securities Selection Risk
Securities selected for the Fund may not perform to expectations. This could result in the Fund’s underperformance compared to its performance index(es), or other funds with similar investment objectives or strategies.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Short Position Risk  
Prospectus [Line Items]  
Risk [Text Block]
Short Position Risk
The Fund will incur a loss as a result of a short position if the price of the instrument sold short increases in value between the date of the short sale and the date on which an offsetting position is purchased. Short positions may be considered speculative transactions and involve special risks, including greater
reliance on the sub-advisor’s ability to accurately anticipate the future value of a security or instrument. As there is potentially no limit on the amount that the security that the Fund is required to purchase may have appreciated, the Fund’s losses are potentially unlimited in a short position transaction, particularly in cases where the Fund is unable to close out its short position. The Fund may invest the proceeds of a short sale and, therefore, be subject to the effect of leverage, in that short selling may amplify changes in the Fund’s NAV since it may increase the exposure of the Fund to certain markets and may increase losses and the volatility of returns.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Small-Capitalization Companies Risk  
Prospectus [Line Items]  
Risk [Text Block]
Small-Capitalization Companies Risk
Investing in the securities of small-capitalization companies involves greater risk and the possibility of greater price volatility, which at times can be rapid and unpredictable, than investing in larger-capitalization and more established companies. Since small-capitalization companies may have narrower commercial markets, and more limited operating history, product lines, and managerial and financial resources than larger, more established companies, the securities of these companies may lack sufficient market liquidity and they can be particularly sensitive to changes in overall economic conditions, interest rates, borrowing costs and earnings.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Trust Preferred Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]
Trust Preferred Securities Risk
Trust preferred securities are subject to market risk, interest rate risk and credit risk. Holders of the trust preferred securities have limited voting rights to control the activities of the trust and no voting rights with respect to the parent company. Trust preferred securities prices fluctuate for several reasons, including changes in the financial condition of an issuer, investors’ perception of the financial condition of an issuer, or the general economic condition of the market for trust preferred securities.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Unrated Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]
Unrated Securities Risk
Because the Fund may purchase securities that are not rated by any rating organization,  the sub-advisor, after assessing their credit quality, may internally assign ratings to certain of those securities in categories similar to those of rating organizations. Unrated securities are subject to the risk that the sub-advisor may not accurately evaluate the security’s comparative credit rating. Some unrated securities may not have an active trading market or may be difficult to value, which means the Fund might have difficulty selling them promptly at an acceptable price. Unrated securities may be subject to greater liquidity risk and price volatility.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Variable and Floating Rate Securities Risk  
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Risk [Text Block]
Variable and Floating Rate Securities Risk
The coupons on variable and floating-rate securities are not fixed and may fluctuate based upon changes in market rates. A variable rate security has a coupon that is adjusted at pre-designated periods in response to changes in the market rate of interest on which the coupon is based. The coupon on a floating rate security is generally based on an interest rate, such as a money-market index, Secured Overnight Financing Rate (“SOFR”), or a Treasury bill rate. Variable and floating rate securities are subject to interest rate risk and credit risk. As short-term interest rates decline, the coupons on variable and floating-rate securities typically decrease. Alternatively, during periods of rising short-term interest rates, the coupons on variable and floating-rate securities typically increase. Changes in the coupons of variable and floating-rate securities may lag behind changes in market rates or may have limits on the maximum increases in the coupon rates. The value of variable and floating-rate securities may decline if their coupons do not rise as much, or as quickly, as interest rates in general. Conversely, variable and floating rate securities will not generally increase in value if interest rates decline. Certain types of variable and floating rate instruments may be subject to greater liquidity risk than other debt securities.
American Beacon SSI Alternative Income Fund | American Beacon SSI Alternative Income Fund | Zero Coupon Securities Risk  
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Risk [Text Block]
Zero Coupon Securities Risk
Zero coupon securities are debt securities that do not make periodic interest payments prior to maturity or a specified redemption date (or cash payment date). Accordingly, zero coupon securities usually trade at a deep discount from their face or par value and will be subject to greater fluctuations in market value in response to changing interest rates than debt obligations of comparable  maturities that make current distribution of interest in cash. While interest payments are not made on such securities, the Fund accrues income with respect to these securities for federal income tax and accounting purposes. Longer term zero-coupon bonds are more exposed to interest rate risk than shorter term zero coupon bonds.
AB ARK Transformational Innovation Fund | American Beacon ARK Transformational Innovation Fund  
Prospectus [Line Items]  
Risk [Text Block]
Other Investment Companies Risk
To the extent that the Fund invests in shares of other registered investment companies, the Fund will indirectly bear the fees and expenses charged by those investment companies in addition to the Fund’s direct fees and expenses. To the extent the Fund invests in other investment companies that invest in equity securities, fixed-income securities and/or foreign securities, or that track an index, the Fund is subject to the risks associated with the underlying investments held by the investment company or the index fluctuations to which the investment company is subject. The Fund may invest in securities of an investment company advised by the Manager and/or a sub-advisor, with respect to which the Manager and/or sub-advisor also receives a management or advisory fee. The Manager and/or sub-advisor has a financial incentive to invest in an affiliated rather than unaffiliated investment company and thus has a potential conflict between its own financial interest and the Fund’s interest. The Fund will be subject to the risks associated with investments in those companies, including but not limited to the following:
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Government Money Market Funds Risk. Investments in government money market funds are subject to interest rate risk, credit risk, and market risk. Interest rate risk is the risk that rising interest rates could cause the value of such an investment to decline.   Credit risk is the risk that the issuer, guarantor or insurer of an obligation, or the  counterparty to a transaction, may fail or become less able or unwilling, to make timely payment of interest or principal or otherwise honor its obligations, or that it may default completely.
AB ARK Transformational Innovation Fund | American Beacon ARK Transformational Innovation Fund | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] There is no assurance that the Fund will achieve its investment objective, and you could lose part or all of your investment in the Fund.
AB ARK Transformational Innovation Fund | American Beacon ARK Transformational Innovation Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items]  
Risk [Text Block] An investment in the Fund is not a deposit with a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
AB ARK Transformational Innovation Fund | American Beacon ARK Transformational Innovation Fund | Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Non-Diversification Risk
The Fund is non-diversified, which means it may focus its investments in the securities of a comparatively small number of issuers. Investments in securities of a limited number of issuers exposes the Fund to greater market risk, price volatility and potential losses than if assets were diversified among the securities of a greater number of issuers.   Because the Fund may have a focused portfolio of fewer companies than other funds, including both diversified and non-diversified funds, the increase or decrease of the value of a single investment may have a greater impact on the Fund’s net asset value (“NAV”) and total return when compared to other funds.
AB ARK Transformational Innovation Fund | American Beacon ARK Transformational Innovation Fund | Allocation Risk  
Prospectus [Line Items]  
Risk [Text Block]
Allocation Risk
The allocations among strategies, asset classes and market exposures may be less than optimal and may adversely affect the Fund’s performance. There can be no assurance, particularly during periods of market disruption and stress, that judgments about allocations will be correct. The Fund’s allocations may be invested in strategies, asset classes and market exposures during a period when such strategies, asset classes and market exposures underperform.
AB ARK Transformational Innovation Fund | American Beacon ARK Transformational Innovation Fund | Currency Risk  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk
The Fund may have exposure to foreign currencies. Foreign currencies may fluctuate significantly over short periods of time, may be affected unpredictably by intervention, or the failure to intervene, of the  U.S. or foreign governments or central banks, and may be affected by currency controls or political developments in the U.S. or abroad. Foreign currencies may also decline in value relative to the U.S. dollar and other currencies and thereby affect the Fund’s investments.
AB ARK Transformational Innovation Fund | American Beacon ARK Transformational Innovation Fund | Cybersecurity and Operational Risk  
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Risk [Text Block]
Cybersecurity and Operational Risk
Operational risks arising from, among other problems, human errors, systems and technology disruptions or failures, or cybersecurity incidents may negatively impact the Fund, its service providers and third-party fund distribution platforms, including the ability of shareholders to transact in the Fund’s shares, and result in financial losses. Cybersecurity incidents may allow an unauthorized party to gain access to Fund assets, shareholder data, or proprietary information, or cause the Fund or its service providers, as well as securities trading venues and their service providers, to suffer data corruption or lose operational functionality. Cybersecurity incidents can result from deliberate attacks or unintentional events. It is not possible for the Fund or its service providers to identify all of the operational risks that may affect the Fund or to develop processes and controls to completely eliminate or mitigate their occurrence or effects. The Fund cannot control the cybersecurity and operational plans and systems of its service providers, its counterparties or the issuers of securities in which the Fund invests. The issuers of the Fund’s investments are likely to be dependent on computers for their operations and require ready access to their data and the internet to conduct their business. Thus, cybersecurity incidents could also affect issuers of the Fund’s investments, leading to significant loss of value.
AB ARK Transformational Innovation Fund | American Beacon ARK Transformational Innovation Fund | Environmental, Social, and/or Governance Investing Risk  
Prospectus [Line Items]  
Risk [Text Block]
Environmental, Social, and/or Governance Investing Risk
The use of environmental, social, and/or governance (“ESG”) considerations by  the sub-advisor may cause the Fund to make different investments than funds that have a similar investment style but do not incorporate such considerations in their strategy. As with the use of any investment considerations involved in investment decisions, there is no guarantee that the use of any ESG investment considerations will result in the selection of issuers that will outperform other issuers or help reduce risk in the Fund. The Fund may underperform funds that do not incorporate these considerations or incorporate different ESG considerations. Although the  sub-advisor has established its own process to oversee ESG integration in accordance with the Fund’s strategies, successful integration of ESG factors will depend on the  sub-advisor’s skill in researching, identifying, and applying these factors, as well as on the availability of relevant data. The regulatory landscape with respect to ESG investing in the United States is evolving and any future rules or regulations may require the Fund to change its investment process with respect to the integration of ESG factors.
AB ARK Transformational Innovation Fund | American Beacon ARK Transformational Innovation Fund | Emerging Markets Risk  
Prospectus [Line Items]  
Risk [Text Block]
Emerging Markets Risk
When investing in emerging markets, the risks of investing in foreign securities are heightened. Emerging markets are generally smaller, less developed, less liquid and more volatile than the securities markets of the U.S. and other developed markets. There are also risks of: greater political or economic uncertainties; an economy’s dependence on revenues from particular commodities or on international aid or development assistance; currency transfer restrictions; a limited number of potential buyers for such securities resulting in increased volatility and limited liquidity for emerging market securities; trading suspensions and other restrictions on investment; delays and disruptions in securities clearing and settlement procedures; and significant limitations on investor rights and recourse. The governments of emerging market countries may also be more unstable and more likely to impose capital controls, nationalize a company or industry, place restrictions on foreign ownership and on withdrawing sale proceeds of securities from the country, intervene in the financial markets, and/or impose burdensome taxes that could adversely affect security prices. In addition, there may be less publicly available information about issuers in emerging markets than would be available about issuers in more developed capital markets, and such issuers may not be subject to accounting, auditing, financial reporting and recordkeeping standards and requirements comparable to those to which U.S. companies are subject.
AB ARK Transformational Innovation Fund | American Beacon ARK Transformational Innovation Fund | Growth Companies Risk  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk
Growth companies are expected to increase their earnings at a certain rate. When these expectations are not met or decrease, the prices of these stocks may decline, sometimes sharply, even if earnings showed an absolute increase. The Fund’s investments in growth companies may be more sensitive to company earnings and more volatile than the market in general primarily because their stock prices are based heavily on future expectations. If an assessment of the prospects for a company’s growth is incorrect, then the price of the company’s stock may fall or not approach the value placed on it. Growth company stocks may also lack the dividend yield that can cushion stock price declines in market downturns.
AB ARK Transformational Innovation Fund | American Beacon ARK Transformational Innovation Fund | Equity Investments Risk  
Prospectus [Line Items]  
Risk [Text Block]
Equity Investments Risk
Equity securities represent ownership interests in companies and are subject to investment risk, issuer risk and market risk. In general, the values of stocks and other equity securities fluctuate, and sometimes widely fluctuate, in response to changes in a company’s financial condition as well as general market, economic and political conditions and other factors. The Fund may experience a significant or complete loss on its investment in an equity security. In addition, stock prices may be particularly sensitive to rising interest rates, which increase borrowing costs and the costs of capital.  The Fund may invest in the following equity securities, which may expose the Fund to the following additional risks:
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Common Stock Risk. The value of a company’s common stock may fall as a result of factors affecting the company, companies in the same industry or sector, or the financial markets overall. Common stock generally is subordinate to preferred stock upon the liquidation or bankruptcy of the issuing company.
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Depositary Receipts Risk. Depositary receipts are subject to certain of the risks associated with investing directly in foreign securities, including, but not limited to, currency exchange rate fluctuations, political and financial instability in the home country of a particular depositary receipt, less liquidity, more volatility, less government regulation and supervision and delays in transaction settlement.
AB ARK Transformational Innovation Fund | American Beacon ARK Transformational Innovation Fund | Foreign Investing Risk  
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Risk [Text Block]
Foreign Investing Risk
Non-U.S. investments carry potential risks not associated with U.S. investments. Such risks may include, but are not limited to: (1) currency exchange rate fluctuations, (2) political and financial instability, (3) less liquidity, (4) lack of uniform accounting, auditing, recordkeeping and financial reporting standards, (5) greater volatility, (6) different government regulation and supervision of foreign stock exchanges, brokers and listed companies, and (7) delays or failures in transaction payment and settlement in some foreign markets. Additionally, trading in foreign markets generally involves higher transaction costs than trading in U.S. markets. The Fund’s investment in a foreign issuer may subject the Fund to regulatory, political, currency, security, economic and other risks associated with that country, including tariffs, trade disputes and sanctions. Global economic and financial markets have become increasingly interconnected and conditions (including recent volatility, terrorism, war and political instability) and events (including natural disasters) in one country, region or financial market may adversely impact issuers in a different country, region or financial market.
AB ARK Transformational Innovation Fund | American Beacon ARK Transformational Innovation Fund | Investment Risk  
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Risk [Text Block]
Investment Risk
An investment in the Fund is not a deposit with a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. When you sell your shares of the Fund, they could be worth less than what you paid for them. Therefore, you may lose money by investing in the Fund.
AB ARK Transformational Innovation Fund | American Beacon ARK Transformational Innovation Fund | Issuer Risk  
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Risk [Text Block]
Issuer Risk
The value of, and/or the return generated by, a security may decline for a number of reasons that directly relate to the issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods or services, as well as the historical and prospective earnings of the issuer and the value of its assets.
AB ARK Transformational Innovation Fund | American Beacon ARK Transformational Innovation Fund | Large-Capitalization Companies Risk  
Prospectus [Line Items]  
Risk [Text Block]
Large-Capitalization Companies Risk
The securities of large market capitalization companies may underperform other segments of the market because such companies may be less responsive to competitive challenges and opportunities and, at times, such companies may be out of favor with investors. Many larger-capitalization companies also may be unable to attain the high growth rates of successful smaller companies, especially during periods of economic expansion.
AB ARK Transformational Innovation Fund | American Beacon ARK Transformational Innovation Fund | Sector Risk  
Prospectus [Line Items]  
Risk [Text Block]
Sector Risk
To the extent the Fund invests more heavily in particular sectors, its performance will be especially sensitive to developments and economic conditions that significantly affect those sectors. Issuers in the same economic sector may be similarly affected by economic or market events, making the Fund more vulnerable to unfavorable developments in that economic sector than funds that invest more broadly. Additionally, Individual sectors may be more volatile, and may perform differently, than the broader market. Because the Fund may hold a limited number of securities, it may at times be substantially over-weighted in certain economic sectors and under-weighted in others. Accordingly, the Fund’s performance is likely to be disproportionately affected by the factors influencing those sectors. As the Fund’s portfolio changes over time, the Fund’s exposure to a particular sector may become higher or lower.
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Information Technology Sector Risk. The Information Technology sector includes companies engaged in software and services, technology hardware and storage peripherals, electronic equipment and components, and semiconductors and semiconductor equipment. Information technology companies face intense competition, both domestically and internationally, which may have an adverse effect on profit margins. Information technology companies may have limited product lines, markets, financial resources or personnel. The products of information technology companies may face rapid product obsolescence due to technological developments and frequent new product introduction, unpredictable changes in growth rates and competition for the services of qualified personnel. Failure to introduce new products, develop and maintain a loyal customer base or achieve general market acceptance for their products could have a material adverse effect on a company’s business. Companies in the Information Technology sector also may be subject to
increased government scrutiny or adverse government or regulatory action. Additionally, companies in the Information Technology sector are heavily dependent on intellectual property and the loss of patent, copyright or trademark protections may adversely affect the profitability of these companies. The market prices of information technology-related securities tend to exhibit a greater degree of market risk and sharp price fluctuations than other types of securities. These securities may fall in and out of favor with investors rapidly, which may cause sudden selling and dramatically lower market prices.
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Software Companies Risk. Software companies can be significantly affected by intense competition, technological innovations, and product obsolescence. Such companies are subject to significant competitive pressures, such as aggressive pricing, new market entrants, competition for market share, the ability to attract and retain skilled employees, short product cycles due to an accelerated rate of technological developments and the potential for limited earnings and/or falling profit margins. These companies also face the risks that new services, equipment or technologies will not be accepted by consumers and businesses or will become rapidly obsolete. These factors can affect the profitability of these companies and, as a result, the value of their securities. Also, protection of intellectual property is integral to the success of many software companies, and profitability can be affected materially by, among other things, the cost of obtaining (or failing to obtain) patent approvals, the cost of litigating patent infringement and the loss of patent protection for products (which significantly increases pricing pressures and can materially reduce profitability with respect to such products). In addition, many software companies have limited operating histories, and software company stocks may experience substantial fluctuations in market price, especially in the short term.
AB ARK Transformational Innovation Fund | American Beacon ARK Transformational Innovation Fund | Liquidity Risk  
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Risk [Text Block]
Liquidity Risk
The Fund is susceptible to the risk that certain investments held by the Fund may have limited marketability, be subject to restrictions on sale, be difficult or impossible to purchase or sell at favorable times or prices or become less liquid in response to market developments or adverse credit events that may affect issuers or guarantors of a security. An inability to sell a portfolio position can adversely affect the Fund’s value or prevent the Fund from being able to take advantage of other investment opportunities. Market prices for such instruments may be volatile. During periods of substantial market volatility, an investment or even an entire market segment may become illiquid, sometimes abruptly, which can adversely affect the Fund’s ability to limit losses. The Fund could lose money if it is unable to dispose of an investment at a time that is most beneficial to the Fund. The Fund may be required to dispose of investments at unfavorable times or prices to satisfy obligations, which may result in losses or may be costly to the Fund.   Unexpected redemptions may force the Fund to sell certain investments at unfavorable prices to meet redemption requests or other cash needs.  Judgment plays a greater role in pricing illiquid investments than in investments with more active markets.
AB ARK Transformational Innovation Fund | American Beacon ARK Transformational Innovation Fund | Securities Lending Risk  
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Risk [Text Block]
Securities Lending Risk
To the extent the Fund lends its securities, it may be subject to the following risks: (i) the securities in which the Fund reinvests cash collateral may decrease in value, causing the Fund to incur a loss, or may not perform sufficiently to cover the Fund’s payment to the borrower of a pre-negotiated fee or “rebate” for the use of that cash collateral in connection with the loan; (ii) non-cash collateral may decline in value, resulting in the Fund becoming under-secured; (iii) delays may occur in the recovery of loaned securities from borrowers, which could result in the Fund being unable to vote proxies or settle transactions or cause the Fund to incur increased costs; and (iv) if the borrower becomes subject to insolvency or similar proceedings, the Fund could incur delays in its ability to enforce its rights in its collateral.
AB ARK Transformational Innovation Fund | American Beacon ARK Transformational Innovation Fund | Market Risk  
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Risk [Text Block]
Market Risk
The Fund is subject to the risk that the securities markets will move down, sometimes rapidly and unpredictably, based on overall economic conditions and other factors, which may negatively affect the Fund’s performance. The financial markets generally move in cycles, with periods of rising prices followed by periods of declining prices. The value of your investment may reflect these fluctuations. During a general downturn in the securities markets, multiple asset classes may decline in value simultaneously. Even when certain securities prices have generally increased over time, there have been periods of price decreases during those times, resulting in losses for investors, which are likely to occur again in the future.
Geopolitical and other events, including war, terrorism, trade disputes, pandemics, public health crises, natural disasters, and  cybersecurity incidents, have led, and in the future may continue to lead, to general instability in world economies and markets and reduced liquidity in securities, which may negatively affect the value of your investment.
Policies established by the  U.S. government and/or Federal Reserve and economic and political circumstances within the U.S. and abroad, such as inflation, changes in interest rates, recessions, changes in government leadership, a government’s inability to agree on a budget, high public debt, the threat or occurrence of a federal government shutdown and threats or the occurrence of a failure to increase the federal government’s debt limit, which could result in a default on the government’s obligations, may negatively affect investor and consumer confidence and may negatively impact financial markets and the broader economy, perhaps suddenly and to a significant degree.
Markets and market participants are increasingly reliant upon public and proprietary data and systems. Data or technology malfunctions and inaccuracies may disrupt markets and lead to negative consequences for market participants like the Fund.  
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Recent Market Events Risk. Both U.S. and international markets have experienced significant volatility in recent months and years. As a result of such volatility, investment returns may fluctuate significantly. Moreover, during periods of significant volatility, the risks discussed herein associated with an investment in the Fund may be increased. National economies are substantially interconnected, as are global financial markets, which creates the possibility that conditions in one country or region might adversely impact issuers in a different country or region. However, the interconnectedness of economies and/or markets may be changing, which may impact such economies and markets in ways that cannot be foreseen at this time.
Some countries, including the  U.S., have adopted more protectionist trade policies, including trade tariffs and other trade barriers, which is a trend that appears to be continuing globally. The economies of all nations, including the U.S., are subject to the risks of slowing global economic growth, protectionist trade policies, inflationary pressures, limits imposed by international trade and security agreements, political or economic dysfunction, poor consumer
sentiment, and reduced demand for goods due to fluctuating commodity prices and currency values, and these risks may create significant market volatility in ways that cannot be foreseen at the present time. These economic risks could have a negative impact on the Fund’s investments.
The U.S. Federal Reserve and certain foreign central banks may raise or lower interest rates in response to economic or other factors, including inflation. It is difficult to accurately predict the various economic and political factors that influence interest rate changes, including the direction, pace, timing, frequency or magnitude of any such changes in interest rates. Changes in interest rates could lead to an economic slowdown in the U.S. and abroad, significant market volatility and reduced liquidity in certain sectors of the market.
Tensions, war, or open conflict between nations, such as among the United States, Israel and Iran, between Russia and Ukraine, otherwise in the Middle East or in eastern Asia could affect the economies of many nations, including the United States and may contribute to increased volatility and uncertainty in the financial markets. The extent and duration of ongoing hostilities and related sanctions and the repercussions of such events cannot be predicted. Those events have presented and could continue to present material uncertainty and risk with respect to markets globally, including in the oil and gas markets and potentially other industries and sectors, and the performance of the Fund and its investments or operations could be negatively impacted.  
Advancements in technology, including advanced development and increased regulation of artificial intelligence, may adversely impact market movements and liquidity. As artificial intelligence is used more widely, which can occur relatively rapidly, the profitability and growth of certain issuers and industries may be negatively impacted in ways that cannot be foreseen and could adversely impact issuer and market performance. As a consequence, the Fund’s holdings and its overall performance could be negatively impacted.
Global climate change may affect property and security values. Certain issuers, industries and regions may be adversely affected by the impacts of climate change in ways that cannot be foreseen. The impacts of legislation, regulation and international accords related to climate change, as well as any indirect consequences that may not be foreseen, may negatively impact certain issuers, industries and regions.
AB ARK Transformational Innovation Fund | American Beacon ARK Transformational Innovation Fund | Market Timing Risk  
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Market Timing Risk
The Fund is subject to the risk of market timing activities by investors due to the nature of the Fund’s investments, which requires the Fund, in certain instances, to fair value certain of its investments. Some investors may engage in frequent short-term trading in the Fund to take advantage of any price differentials that may be reflected in the net asset value (“NAV”) of the Fund’s shares. Frequent trading by Fund shareholders poses risks to other shareholders in the Fund, including (i) the dilution of the Fund’s NAV, (ii) an increase in the Fund’s expenses, and (iii) interference with the ability to execute efficient investment strategies.
AB ARK Transformational Innovation Fund | American Beacon ARK Transformational Innovation Fund | Transformational Innovation Risk  
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Transformational Innovation  Risk
Companies that  the sub-advisor believes are capitalizing on transformational innovation and developing technologies to displace older technologies or create new markets may not in fact do so. Companies that initially develop a novel technology may not be able to capitalize on the technology. Companies that develop transformational technologies may face political or legal challenges from competitors, industry groups or local and national governments. These companies may also be exposed to risks applicable to sectors other than the transformational innovation theme for which they are chosen, and the securities issued by these companies may underperform the securities of other companies that are also focused on a particular theme.
AB ARK Transformational Innovation Fund | American Beacon ARK Transformational Innovation Fund | Mid-Capitalization Companies Risk  
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Mid-Capitalization Companies Risk
Investing in the securities of mid-capitalization companies involves greater risk and the possibility of greater price volatility, which at times can be rapid and unpredictable, than investing in larger-capitalization and more established companies. Since mid-capitalization companies may have narrower commercial markets and more limited operating history, product lines, and managerial and financial resources than larger, more established companies, the securities of these companies may lack sufficient market liquidity, and they can be particularly sensitive to changes in overall economic conditions, interest rates, borrowing costs and earnings.
AB ARK Transformational Innovation Fund | American Beacon ARK Transformational Innovation Fund | Valuation Risk  
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Valuation Risk
Certain of the Fund’s assets may be valued at a price different from the price at which they can be sold. This risk may be especially pronounced for investments that are illiquid or may become illiquid, or securities that trade in relatively thin markets and/or markets that experience extreme volatility. The valuation of the Fund’s investments in an accurate and timely manner may be impacted by technological issues and/or errors by third party service providers, such as pricing services or accounting agents.
AB ARK Transformational Innovation Fund | American Beacon ARK Transformational Innovation Fund | Volatility Risk  
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Volatility Risk
The Fund may have investments that appreciate or decrease significantly in value over short periods of time. This may cause the Fund’s NAV to experience significant increases or declines in value over short periods of time.
AB ARK Transformational Innovation Fund | American Beacon ARK Transformational Innovation Fund | Redemption Risk  
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Redemption Risk
The Fund may experience periods of high levels of redemptions that could cause the Fund to sell assets at inopportune times or at a loss or depressed value. Heavy redemptions could hurt the Fund’s performance. The sale of assets to meet redemption requests may create net capital gains, which could cause the Fund to have to distribute substantial capital gains. Redemption risk is greater to the extent that one or more investors or intermediaries control a large percentage of investments in the Fund. In addition, redemption risk is heightened during periods of declining or illiquid markets. During periods of heavy redemptions, the Fund may borrow funds through the interfund credit facility or from a bank line of credit, which may increase costs.
AB ARK Transformational Innovation Fund | American Beacon ARK Transformational Innovation Fund | Securities Selection Risk  
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Securities Selection Risk
Securities selected for the Fund may not perform to expectations. This could result in the Fund’s underperformance compared to its performance index(es), or other funds with similar investment objectives or strategies.
AB ARK Transformational Innovation Fund | American Beacon ARK Transformational Innovation Fund | Small-Capitalization Companies Risk  
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Small-Capitalization Companies Risk
Investing in the securities of small-capitalization companies involves greater risk and the possibility of greater price volatility, which at times can be rapid and unpredictable, than investing in larger-capitalization and more established companies. Since small-capitalization companies may have narrower commercial markets, and more limited operating history, product lines, and managerial and financial resources than larger, more established companies, the securities of these companies may lack sufficient market liquidity and they can be particularly sensitive to changes in overall economic conditions, interest rates, borrowing costs and earnings.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Risk Lose Money [Member]  
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Risk [Text Block] There is no assurance that the Fund will achieve its investment objectives, and you could lose part or all of your investment in the Fund.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Risk Not Insured Depository Institution [Member]  
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Risk [Text Block] An investment in the Fund is not a deposit with a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Allocation Risk  
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Allocation Risk
The allocations among strategies, asset classes and market exposures may be less than optimal and may adversely affect the Fund’s performance. There can be no assurance, particularly during periods of market disruption and stress, that judgments about allocations will be correct. The Fund’s allocations may be invested in strategies, asset classes and market exposures during a period when such strategies, asset classes and market exposures underperform.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Callable Securities Risk  
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Callable Securities Risk
The Fund may invest in fixed-income securities with call features. A call feature allows the issuer of the security to redeem or call the security prior to its stated maturity date. In periods of falling interest rates, issuers may be more likely to call in securities that are paying higher coupon rates than prevailing interest rates. In the event of a call, the Fund would lose the income that would have been earned to maturity on that security, and the proceeds received by the Fund may be invested in securities paying lower coupon rates and may not benefit from any increase in value that might otherwise result from declining interest rates.  
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Convertible Securities Risk  
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Convertible Securities Risk
The value of a convertible security, including a convertible preferred security, typically increases or decreases with the price of the underlying common stock. In general, a convertible security is subject to the market risks of stocks when the underlying stock’s price is high relative to the conversion price and is subject to the market risks of debt securities when the underlying stock’s price is low relative to the conversion price. The general market risks of debt securities that are common to convertible securities include, but are not limited to, interest rate risk and credit risk. Many convertible securities have credit ratings that are below investment grade and are subject to the same risks as an investment in below investment grade debt securities (commonly known as “junk bonds”). Lower-rated debt securities may fluctuate more widely in price and yield than investment grade debt securities and may fall in price during times when the economy is weak or is expected to become weak. Convertible securities are subject to the risk that the credit standing of the issuer may have an effect on the convertible security‘s investment value. Convertible securities are sensitive to movement in interest rates.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Counterparty Risk  
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Counterparty Risk
The Fund is subject to the risk that a party or participant to a transaction, such as a broker or a derivative counterparty, will be unwilling or unable to satisfy its obligation to make timely principal, interest or settlement payments or to otherwise honor its obligations to the Fund.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Credit Risk  
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Credit Risk
The Fund is subject to the risk that the issuer, guarantor or insurer of an obligation, or the counterparty to a transaction, may fail, or become less able or unwilling, to make timely payment of interest or principal or otherwise honor its obligations or default completely. Changes in the actual or perceived creditworthiness of an issuer, or a downgrade or default affecting any of the Fund’s securities, could affect the Fund’s performance. Generally, the longer the maturity and the lower the credit quality of a security, the more sensitive it is to credit risk.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Currency Risk  
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Currency Risk
The Fund may have exposure to foreign currencies. Foreign currencies may fluctuate significantly over short periods of time, may be affected unpredictably by intervention, or the failure to intervene, of the  U.S. or foreign governments or central banks, and may be affected by currency controls or political developments in the U.S. or abroad. Foreign currencies may also decline in value relative to the U.S. dollar and other currencies and thereby affect the Fund’s investments.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Cybersecurity and Operational Risk  
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Cybersecurity and Operational Risk
Operational risks arising from, among other problems, human errors, systems and technology disruptions or failures, or cybersecurity incidents may negatively impact the Fund, its service providers and third-party fund distribution platforms, including the ability of shareholders to transact in the Fund’s shares, and result in financial losses. Cybersecurity incidents may allow an unauthorized party to gain access to Fund assets, shareholder data, or proprietary information, or cause the Fund or its service providers, as well as securities trading venues and their service providers, to suffer data corruption or lose operational functionality. Cybersecurity incidents can result from deliberate attacks or unintentional events. It is not possible for the Fund or its service providers to identify all of the operational risks that may affect the Fund or to develop processes and controls to completely eliminate or mitigate their occurrence or effects. The Fund cannot control the cybersecurity and operational plans and systems of its service providers, its counterparties or the issuers of securities in which the Fund invests. The issuers of the Fund’s investments are likely to be dependent on computers for their operations and require ready access to their data and the internet to conduct their business. Thus, cybersecurity incidents could also affect issuers of the Fund’s investments, leading to significant loss of value.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Debentures Risk  
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Debentures Risk
Debentures are unsecured debt securities. The holder of a debenture is protected only by the general creditworthiness of the issuer. The Fund may invest in both corporate and government debentures.  
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Environmental, Social, and/or Governance Investing Risk  
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Environmental, Social, and/or Governance Investing Risk
The use of environmental, social, and/or governance (“ESG”) considerations by  the sub-advisor may cause the Fund to make different investments than funds that have a similar investment style but do not incorporate such considerations in their strategy. As with the use of any investment considerations involved in investment decisions, there is no guarantee that the use of any ESG investment considerations will result in the selection of issuers that will outperform other issuers or help reduce risk in the Fund. The Fund may choose not to, or may not be able to, take advantage of certain investment opportunities due to these considerations, which may adversely affect investment performance. The Fund may underperform funds that do not incorporate these considerations or incorporate different ESG considerations. Although the  sub-advisor has established its own process to oversee ESG integration in accordance with the Fund’s strategies, successful integration of ESG factors will depend on the  sub-advisor’s skill in researching, identifying, and applying these factors, as well as on the availability of relevant data. The sub-advisor may use ESG research and/or ratings information provided by one or more third parties in performing this analysis and considering ESG risks. The regulatory landscape with respect to ESG investing in the United States is evolving and any future rules or regulations may require the Fund to change its investment process with respect to the integration of ESG factors.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Derivatives Risk  
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Derivatives Risk
Derivatives may involve significant risk. The use of derivative instruments may expose the Fund to additional risks that it would not be subject to if it invested directly in the securities or other instruments underlying those derivatives, including the high degree of leverage often embedded in such instruments, and potential material and prolonged deviations between the theoretical value and realizable value of a derivative. The use of derivatives may also increase any adverse effects resulting from the underperformance of strategies, asset classes and market exposures to which the Fund has allocated its assets. Derivatives may at times be highly illiquid, and the Fund may not be able to close out or sell a derivative at a particular time or at an anticipated price. Certain derivatives may be difficult to value, and valuation may be more difficult in times of market turmoil. Derivatives may also be more volatile than other types of investments. Derivative investments can increase portfolio turnover and transaction costs. Derivatives also are subject to counterparty risk  and credit risk. As a result, the Fund may not recover its investment or may only obtain a limited recovery, and any recovery may be delayed.  Not all derivative transactions require a counterparty to post collateral, which may expose the Fund to greater losses in the event of a default by a counterparty. Derivatives transactions requiring the Fund to post collateral may expose the Fund to greater losses in the event of a default by a counterparty.  There may be imperfect correlation between the behavior of a derivative and that of the reference instrument underlying the derivative. An abrupt change in the price of a reference instrument could render a derivative worthless. Derivatives may involve risks different from, and possibly greater than, the risks associated with investing directly in the reference instrument. The Fund may buy or sell derivatives not traded on an exchange, which may be subject to heightened  counterparty, liquidity and valuation risks. Suitable derivatives may not be available in all circumstances, and there can be no assurance that the Fund will use derivatives to reduce exposure to other risks when that might have been beneficial. Ongoing changes to the regulation of derivatives and changes in the regulation of funds using derivative instruments could limit the Fund’s ability to pursue its investment strategies. New regulation of derivatives may make them more costly, or may otherwise adversely affect their liquidity, value or performance.  In addition, the Fund’s investments in derivatives are subject to the following risks:
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Forward Contracts Risk. Forward contracts, including NDFs,   are derivative instruments pursuant to a contract where the parties agree to a fixed price for an agreed amount of securities or other underlying assets at an agreed date or to buy or sell a specific currency at a future date at a price set at the time of the contract. Not all forward contracts, including  NDFs, require a counterparty to post collateral, which may expose the Fund to greater losses in the event of a default by a counterparty. Forward contracts involving currency include the risks associated with fluctuations in currency. The use of forward contracts may expose the Fund to additional risks, such as credit risk, liquidity risk, and counterparty risk, that it would not be subject to if it invested directly in the securities or currencies underlying the forward contract.  There are no limitations on daily price movements of forward contracts. There can be no assurance that any strategy used will succeed.
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Foreign Currency Forward Contracts Risk. Foreign currency forward contracts, including non-deliverable forwards (“NDFs”), are derivative instruments pursuant to a contract where the parties agree to a fixed price for an agreed amount of foreign currency at an agreed date or to buy or sell a specific currency at a future date at a price set at the time of the contract and include the risks associated with fluctuations in currency. There are no limitations on daily price movements of forward contracts. There can be no assurance that any strategy used will succeed. Not all forward contracts, including NDFs, require a counterparty to post collateral, which may expose the Fund to greater losses in the event of a default by a counterparty. The use of foreign currency forward contracts may expose the Fund to additional risks, such as credit risk, liquidity risk, and counterparty risk, that it would not be subject to if it invested directly in the securities or currencies underlying the foreign currency forward contract. There are no limitations on daily price movements of forward contracts. There can be no assurance that any strategy used will succeed.
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Futures Contracts Risk. Futures contracts are derivative instruments pursuant to a contract where the parties agree to a fixed price for an agreed amount of securities or other underlying assets at an agreed date. The use of such derivative instruments may expose the Fund to additional risks, such as liquidity risk and counterparty risk, that it would not be subject to if it invested directly in the securities underlying those derivatives. There can be no assurance that any strategy used will succeed. There may at times be an imperfect correlation between the movement in the prices of futures contracts and the value of their underlying instruments or indexes. There also can be no assurance that, at all times, a liquid market will exist for offsetting a futures contract that the Fund has previously bought or sold, and this may result in the inability to close a futures contract when desired. Futures contracts may experience potentially dramatic price changes, which will increase the volatility of the Fund and may involve a small investment of cash (the amount of initial and variation margin) relative to the magnitude of the risk assumed (the potential increase or decrease in the price of the futures contract). The Fund may invest in the following types of futures contracts:
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Government Bond Futures Contracts Risk. Government bond futures contracts, such as treasury futures contracts, expose  the  Fund to price fluctuations resulting from changes in interest rates and to potential losses if interest rates do not move as expected.
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Index Futures Contracts Risk. Futures contracts on indices expose the Fund to volatility in an underlying index.   
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Interest Rate Futures Contracts Risk. Interest rate futures contracts expose the Fund to price fluctuations resulting from changes in interest rates. The Fund could suffer a loss if interest rates rise after the Fund has purchased an interest rate futures contract or fall after the Fund has sold an interest rate futures contract.
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Options Risk. An option is a contract that gives the purchaser (holder) of the option, in return for a premium, the right to buy from (call) or sell to (put) the seller (writer) of the option the asset underlying the option at a specified exercise price at any time during the term of the option (normally not exceeding nine months).  The Fund may use non-deliverable options (“NDOs”), which are foreign exchange products designed to assist in reducing the foreign
exchange risk, in particular situations when physical delivery of the underlying asset is not required or not possible. There can be no guarantee that the use of options will increase the Fund’s return or income. In addition, there may be an imperfect correlation between the movement in prices of options and the assets underlying them, and there may at times not be a liquid secondary market for options. If an option that the Fund has purchased expires unexercised, the Fund will experience a loss in the amount of the premium it paid. In order for a call option to be profitable, the market price of the underlying asset must rise sufficiently above the call option exercise price to cover the premium and any transaction costs. These costs will reduce any profit that might otherwise have been realized had the Fund bought the underlying asset instead of the call option. In order for a put option to be profitable, the market price of the underlying asset must decline sufficiently below the put option’s exercise price to cover the premium and any transaction costs. By using put options in this manner, the Fund will reduce any profit it might otherwise have realized from having shorted the declining underlying asset by the premium paid for the put option and by transaction costs.   Options on currencies expose the Fund to the risks associated with investments in currencies.
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Structured Notes Risk. Structured notes are derivative debt instruments with principal and/or interest payments linked to the value of a commodity, a foreign currency, an index of securities, an interest rate, or other financial indicators (“reference instruments”). The payments on a structured note may vary based on changes in one or more specified reference instruments, such as a floating interest rate compared to a fixed interest rate, the exchange rates between two currencies, one or more securities or a securities or commodities index. If the underlying investment or index does not perform as anticipated, the structured note might pay less interest than the stated coupon payment or repay less principal upon maturity. The movement of such factors may cause significant price fluctuations. A structured note may be positively or negatively indexed. Structured notes are subject to interest rate risk, market risk, liquidity risk and counterparty risk. They are also subject to credit risk with respect both to the issuer and, if applicable, to the underlying security or borrower. Structured notes may have a limited trading market, making it difficult to value them or sell them at an acceptable price.
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Swap Agreements Risk. Swap agreements or “swaps” are transactions in which the Fund and a counterparty agree to pay or receive payments at specified dates based upon or calculated by reference to changes in specified prices or rates or the performance of specified securities, indices or other assets based on a specified amount (the “notional” amount). Swaps can involve greater risks than a direct investment in an underlying asset, because swaps typically include a certain amount of embedded leverage and as such are subject to leverage risk.   If swaps are used as a hedging strategy, the Fund is subject to the risk that the hedging strategy may not eliminate the risk that it is intended to offset, due to, among other reasons, the occurrence of unexpected price movements or the non-occurrence of expected price movements.   Swaps also may be difficult to value. Swaps may be subject to liquidity risk and counterparty risk, and swaps that are traded over-the-counter are not subject to standardized clearing requirements and may involve greater liquidity and counterparty risks.   The Fund may invest in the following types of swaps:
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Credit Default Swaps Risk. Credit default swaps may also be subject to credit risk and the risks associated with the purchase and sale of credit protection.
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Currency Swaps Risk. Currency swaps may also be subject to currency risk.
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Interest Rate Swaps Risk. Interest rate swaps may also be subject to interest rate and market risks.  
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Total Return Swaps Risk. Total return swaps may also be subject to market risk and, if the underlying securities are bonds or other debt obligations, interest rate risk.
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Warrants Risk, including Sovereign Warrants. Warrants are derivative securities that give the holder the right to purchase a specified amount of securities at a specified price. Warrants may be more speculative than certain other types of investments because warrants do not carry with them dividend or voting rights with respect to the underlying securities, or any rights in the assets of the issuer. In addition, the value of a warrant does not necessarily change with the value of the underlying securities, and a warrant ceases to have value if it is not exercised prior to its expiration date. The Fund may invest in warrants that represent the right to receive payments if an identified revenue, commodity price or economic measure within a country, including an emerging market country, such as the price or volume of domestically produced oil or the growth of the country’s gross domestic product, equals or exceeds a specified level. Such warrants may result from the restructuring of a sovereign debt obligation and may be more speculative than certain other types of sovereign investments. The market for warrants may be very limited and there may at times not be a liquid secondary market for warrants.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Asset Selection Risk  
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Asset Selection Risk
Assets selected for the Fund may not perform to expectations. This could result in the Fund’s underperformance compared to other funds with similar investment objectives.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Asset-Backed Securities Risk  
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Asset-Backed Securities Risk
Investments in asset-backed securities are influenced by factors affecting the assets underlying the securities, including the broader market sector and individual markets, such as the auto markets. These securities may be more sensitive to changes in interest rates than other types of debt securities. Investments in asset-backed securities also are subject to risks of fixed-income securities, which include, but are not limited to, credit risk, interest rate risk, prepayment and extension risk, callable securities risk, valuation risk, liquidity risk, and restricted securities risk. A decline in the credit quality of the issuers of asset-backed securities or instability in the markets for such securities may affect the value and liquidity of such securities, which could result in losses to the Fund. These securities are also subject to the risk of default on the underlying assets, particularly during periods of market downturn, and an unexpectedly high rate of defaults on the underlying assets will adversely affect the security’s value.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Emerging Markets Risk  
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Emerging Markets Risk
When investing in emerging markets, the risks of investing in foreign securities are heightened. Emerging markets are generally smaller, less developed, less liquid and more volatile than the securities markets of the U.S. and other developed markets. There are also risks of: greater political or economic uncertainties; an economy’s dependence on revenues from particular commodities or on international aid or development assistance; currency transfer restrictions; a limited number of potential buyers for such securities resulting in increased volatility and limited liquidity for emerging market securities; trading suspensions and other restrictions on investment; delays and disruptions in securities clearing and settlement procedures; and significant limitations on investor rights and recourse. The governments of emerging market countries may also be more unstable and more likely to impose capital controls, nationalize a company or industry, place restrictions on foreign ownership and on withdrawing sale proceeds of securities from the country, intervene in the financial markets, and/or impose burdensome taxes that could adversely affect security prices. In addition, there may be less publicly available information about issuers in emerging markets than would be available about issuers in more developed capital markets, and such issuers may not be subject to accounting, auditing, financial reporting and recordkeeping standards and requirements comparable to those to which U.S. companies are subject.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Equity Investments Risk  
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Equity Investments Risk
Equity securities represent ownership interests in companies and are subject to investment risk, issuer risk and market risk. In general, the values of stocks and other equity securities fluctuate, and sometimes widely fluctuate, in response to changes in a company’s financial condition as well as general market, economic and political conditions and other factors. The Fund may experience a significant or complete loss on its investment in an equity security. In addition, stock prices may be particularly sensitive to rising interest rates, which increase borrowing costs and the costs of capital.  The Fund may invest in the following equity securities, which may expose the Fund to the following additional risks:
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Real Estate Investment Trusts (“REITs”) Risk. Investments in REITs are subject to the risks associated with investing in the real estate industry, including, among other risks: adverse developments affecting the real estate industry; declines in real property values; changes in interest rates; defaults by mortgagors or other borrowers and tenants; lack of availability of mortgage funds or financing; extended vacancies of properties, especially during
economic downturns; casualty or condemnation losses; regulatory limitations on rents and operating expenses; and other governmental actions, such as changes to tax laws, zoning regulations or environmental regulations. REITs also are dependent upon the skills of their managers and are subject to heavy cash flow dependency or self-liquidation. Regardless of where a REIT is organized or traded, its performance may be affected significantly by events in the region where its properties are located. REITs may not be diversified geographically or by property or tenant type. Domestic REITs could be adversely affected by failure to qualify for tax-free “pass-through” of distributed net income and net realized gains under the Internal Revenue Code of 1986, as amended (“Internal Revenue Code”), or to maintain their exemption from registration under the Investment Company Act of 1940, as amended (“Investment Company Act”). REITs typically incur fees that are separate from those incurred by the Fund. Accordingly, the Fund’s investment in REITs will result in the layering of expenses such that shareholders will indirectly bear a proportionate share of the REITs’ operating expenses, in addition to paying Fund expenses. The value of REIT common stock may decline when interest rates rise.  Publicly traded REITs may typically trade in wider spreads depending on market conditions. REITs tend to be small- to mid-capitalization securities and, as such, are subject to the risks of investing in small- to mid-capitalization securities.  
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Collateralized Loan Obligations CLOs Risk  
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Collateralized Loan Obligations (“CLOs”) Risk
The risks of an investment in a CLO depend largely on the type of underlying collateral and the class or seniority of CLO in which the Fund invests. The Fund typically will invest in CLOs collateralized by bank loans.   Therefore, the CLOs in which the Fund invests will be subject to loan interests risk. In addition, CLOs typically are privately offered and sold, and thus, are not registered under the securities laws. As a result, investments in CLOs may be characterized as illiquid securities. The Fund’s investments in CLOs and other similarly structured investments may expose the Fund to heightened credit risk, interest rate risk, liquidity risk, market risk, and prepayment and extension risk. In addition to these risks, CLOs may also carry additional risks including, but not limited to: (i) the possibility that distributions from collateral securities will not be adequate to make interest or other payments; (ii) the risk that the quality of the collateral may decline in value or default; (iii) the risk that the Fund may invest in CLOs that are subordinate to other classes; (iv) the risk that the complex structure of the security may not be fully understood at the time of investment and may produce disputes with the issuer or unexpected investment results; and (v) the possibility that the CLO’s manager may perform poorly. CLOs may charge management and other administrative fees, which are in addition to those of the Fund. CLOs may be difficult to value and may be highly leveraged, which could make them highly volatile.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Foreign Investing Risk  
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Foreign Investing Risk
Non-U.S. investments carry potential risks not associated with U.S. investments. Such risks may include, but are not limited to: (1) currency exchange rate fluctuations, (2) political and financial instability, (3) less liquidity, (4) lack of uniform accounting, auditing, recordkeeping and financial reporting standards, (5) greater volatility, (6) different government regulation and supervision of foreign stock exchanges, brokers and listed companies, and (7) delays or failures in transaction payment and settlement in some foreign markets. Additionally, trading in foreign markets generally involves higher transaction costs than trading in U.S. markets. The Fund’s investment in a foreign issuer may subject the Fund to regulatory, political, currency, security, economic and other risks associated with that country, including tariffs, trade disputes and sanctions. Global economic and financial markets have become increasingly interconnected and conditions (including recent volatility, terrorism, war and political instability) and events (including natural disasters) in one country, region or financial market may adversely impact issuers in a different country, region or financial market.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Contingent Convertible Securities CoCos Risk  
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Contingent Convertible Securities (“CoCos”) Risk
The prices of contingent convertible securities (“CoCos”) may be significantly more volatile during times of market turmoil. CoCos are subordinated debt, and the Fund’s claims will generally be junior to the claims of other creditors if the issuer liquidates or dissolves. Interest payments on CoCos could be canceled by the issuer or a regulator. If the issuer converts the CoCo to an equity security, the Fund would lose interest payments and potentially all income, and the Fund’s investment would be even further subordinated. The issuer could alternatively write down the principal due on the CoCos. The write-down of the security’s par value may occur automatically and would not entitle holders to institute bankruptcy proceedings against the issuer. In addition, an automatic write-down could result in a reduced income rate if the dividend or interest payment associated with the security is based on the security’s par value, or even a complete loss on investment with no chance of recovery even if the issuer remains in existence. CoCos carry the general risks applicable to other fixed income investments, including interest rate risk, credit risk, market risk and liquidity risk.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Hedging Risk  
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Hedging Risk
If the Fund uses a hedging instrument at the wrong time or judges the market conditions incorrectly, or the hedged instrument does not correlate to the risk sought to be hedged, the hedge might be unsuccessful, reduce the Fund’s return, or create a loss. In addition, hedges, even when successful in mitigating risk, may not prevent the Fund from experiencing losses on its investments. Hedging instruments may also reduce or eliminate gains that may otherwise have been available had the Fund not used the hedging instruments.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | High-Yield Securities Risk  
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High-Yield Securities Risk
Exposure to high-yield, below investment-grade securities (commonly referred to as “junk bonds”) generally involves significantly greater risks than an investment in investment grade securities. High-yield debt securities may fluctuate more widely in price and yield and may fall in price when the economy is weak or expected to become weak. These securities also may be difficult to sell at the time and price the Fund desires. High-yield securities are considered to be speculative with respect to an issuer’s ability to pay interest and principal and carry a greater risk that the issuers of lower-rated securities will default on the timely payment of principal and interest. High-yield securities may experience greater price volatility and less liquidity than investment grade securities. Issuers of securities that are in default or have defaulted may fail to resume principal or interest payments, in which case the Fund may lose its entire investment.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Covenant-Lite Obligations Risk  
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“Covenant-Lite” Obligations Risk
Certain investments, such as loans in which the Fund may invest directly or have exposure to through its investments in structured securities, may be “covenant-lite.” Covenant-lite obligations contain fewer maintenance covenants than other obligations, or no maintenance covenants at all, and may not include terms which allow the lender to monitor the financial performance of the borrower and declare a default if certain criteria are breached. The Fund’s exposure to losses on such investments may be increased, especially during a downturn in the credit cycle.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Interest Rate Risk  
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Interest Rate Risk
Generally, the value of investments with interest rate risk, such as fixed-income securities or derivatives, will move in the opposite direction as movements in interest rates. Factors including central bank monetary policy, rising inflation rates, and changes in general economic conditions may cause interest rates to rise, which could cause the value of the Fund’s investments to decline. Interest rate increases, including significant or rapid increases, may result in a decline in the value of investments   or derivatives held by the Fund, make issuers less willing or able to make principal and interest payments on fixed-income investments when due, lead to heightened volatility in the fixed-income markets and adversely affect the liquidity of certain fixed-income investments, any of which may result in substantial losses to the Fund. When interest rates decline, issuers may prepay higher-yielding securities held by the Fund, resulting in the Fund reinvesting in securities with lower yields, which may cause a decline in its income.   Interest rate changes may have a more pronounced effect on the market value of fixed-rate instruments than on floating-rate instruments. The value of floating rate and variable securities may decline if their interest rates do not rise as quickly, or as much, as general interest rates. The prices of fixed-income securities  or derivatives are also affected by their  durations. Fixed-income securities or derivatives with longer durations generally have greater sensitivity to changes in interest rates than those with shorter durations. Rising interest rates may cause the value of the Fund’s investments with longer durations and terms to maturity to decline, which may adversely affect the value of the Fund. For example, if a bond has a duration of eight years, a 1% increase in interest rates could be expected to result in an 8% decrease in the value of the bond. Fluctuations in interest rates may also affect the liquidity of fixed-income securities and instruments held by the Fund.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Investment Risk  
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Investment Risk
An investment in the Fund is not a deposit with a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. When you sell your shares of the Fund, they could be worth less than what you paid for them. Therefore, you may lose money by investing in the Fund.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Issuer Risk  
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Issuer Risk
The value of, and/or the return generated by, a security may decline for a number of reasons that directly relate to the issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods or services, as well as the historical and prospective earnings of the issuer and the value of its assets.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Sector Risk  
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Sector Risk
When the Fund focuses its investments in certain sectors of the economy, its performance could fluctuate more widely than if the Fund were invested more evenly across sectors. Issuers in the same economic sector may be similarly affected by economic or market events, making the Fund more vulnerable to unfavorable developments in that economic sector than funds that invest more broadly. Additionally, individual sectors may be more volatile, and may perform differently, than the broader market. As the Fund’s portfolio changes over time, the Fund’s exposure to a particular sector may become higher or lower.
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Financials Sector Risk. Companies in the Financials sector are subject to extensive governmental regulation and intervention, which may result in financial penalties and limits on the scope of their activities, the amounts and types of loans and other financial commitments they can make, the interest rates and fees they can charge, the scope of their activities, the prices they can charge, the amount of capital they must maintain and, potentially, their size. The impact of recent or future regulation on the Financials sector, including more stringent capital requirements, cannot be predicted. In addition, fiscal, regulatory and monetary policies, economic conditions, interest rate changes, credit rating downgrades, and decreased liquidity in the credit markets may cause an adverse impact in a broad range of markets, including U.S. and international credit and interbank money markets, thereby affecting a wide range of companies in the Financials sector. Cybersecurity incidents and technology malfunctions and failures have become increasingly frequent and have caused significant losses to companies in this sector, which also may negatively impact the Fund.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Liquidity Risk  
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Liquidity Risk
The Fund is susceptible to the risk that certain investments held by the Fund may have limited marketability, be subject to restrictions on sale, be difficult or impossible to purchase or sell at favorable times or prices or become less liquid in response to market developments or adverse credit events that may affect issuers or guarantors of a security. An inability to sell a portfolio position can adversely affect the Fund’s value or prevent the Fund from being able to take advantage of other investment opportunities. Market prices for such instruments may be volatile. During periods of substantial market volatility, an investment or even an entire market segment may become illiquid, sometimes abruptly, which can adversely affect the Fund’s ability to limit losses. The Fund could lose money if it is unable to dispose of an investment at a time that is most beneficial to the Fund. The Fund may be required to dispose of investments at unfavorable times or prices to satisfy obligations, which may result in losses or may be costly to the Fund.  Judgment plays a greater role in pricing illiquid investments than in investments with more active markets.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Market Risk  
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Market Risk
The Fund is subject to the risk that the securities markets will move down, sometimes rapidly and unpredictably, based on overall economic conditions and other factors, which may negatively affect the Fund’s performance. The financial markets generally move in cycles, with periods of rising prices followed by periods of declining prices. The value of your investment may reflect these fluctuations. During a general downturn in the securities markets, multiple asset classes may decline in value simultaneously. Even when certain securities prices have generally increased over time, there have been periods of price decreases during those times, resulting in losses for investors, which are likely to occur again in the future.
Geopolitical and other events, including war, terrorism, trade disputes, pandemics, public health crises, natural disasters, and  cybersecurity incidents, have led, and in the future may continue to lead, to general instability in world economies and markets and reduced liquidity in securities, which may negatively affect the value of your investment.
Policies established by the  U.S. government and/or Federal Reserve and economic and political circumstances within the U.S. and abroad, such as inflation, changes in interest rates, recessions, changes in government leadership, a government’s inability to agree on a budget, high public debt, the threat or occurrence of a federal government shutdown and threats or the occurrence of a failure to increase the federal government’s debt limit, which could result in a default on the government’s obligations, may negatively affect investor and consumer confidence and may negatively impact financial markets and the broader economy, perhaps suddenly and to a significant degree.
Markets and market participants are increasingly reliant upon public and proprietary data and systems. Data or technology malfunctions and inaccuracies may disrupt markets and lead to negative consequences for market participants like the Fund.  
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Recent Market Events Risk. Both U.S. and international markets have experienced significant volatility in recent months and years. As a result of such volatility, investment returns may fluctuate significantly. Moreover, during periods of significant volatility, the risks discussed herein associated with an investment in the Fund may be increased. National economies are substantially interconnected, as are global financial markets, which creates the possibility that conditions in one country or region might adversely impact issuers in a different country or region. However, the interconnectedness of economies and/or markets may be changing, which may impact such economies and markets in ways that cannot be foreseen at this time.
Some countries, including the  U.S., have adopted more protectionist trade policies, including trade tariffs and other trade barriers, which is a trend that appears to be continuing globally. The economies of all nations, including the U.S., are subject to the risks of slowing global economic growth, protectionist trade policies, inflationary pressures, limits imposed by international trade and security agreements, political or economic dysfunction, poor consumer sentiment, and reduced demand for goods due to fluctuating commodity prices and currency values, and these risks may create significant market volatility in ways that cannot be foreseen at the present time. These economic risks could have a negative impact on the Fund’s investments.
The U.S. Federal Reserve and certain foreign central banks may raise or lower interest rates in response to economic or other factors, including inflation. It is difficult to accurately predict the various economic and political factors that influence interest rate changes, including the direction, pace, timing, frequency or magnitude of any such changes in interest rates. Changes in interest rates could lead to an economic slowdown in the U.S. and abroad, significant market volatility and reduced liquidity in certain sectors of the market.
Tensions, war, or open conflict between nations, such as among the United States, Israel and Iran, between Russia and Ukraine, otherwise in the Middle East or in eastern Asia could affect the economies of many nations, including the United States and may contribute to increased volatility and uncertainty in the financial markets. The extent and duration of ongoing hostilities and related sanctions and the repercussions of such events cannot be predicted. Those events have presented and could continue to present material uncertainty and risk with respect to markets globally, including in the oil and gas markets and potentially other industries and sectors, and the performance of the Fund and its investments or operations could be negatively impacted.  
Advancements in technology, including advanced development and increased regulation of artificial intelligence, may adversely impact market movements and liquidity. As artificial intelligence is used more widely, which can occur relatively rapidly, the profitability and growth of certain issuers and industries may be negatively impacted in ways that cannot be foreseen and could adversely impact issuer and market performance. As a consequence, the Fund’s holdings and its overall performance could be negatively impacted.
Global climate change may affect property and security values. Certain issuers, industries and regions may be adversely affected by the impacts of climate change in ways that cannot be foreseen. The impacts of legislation, regulation and international accords related to climate change, as well as any indirect consequences that may not be foreseen, may negatively impact certain issuers, industries and regions.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Market Direction Risk  
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Market Direction Risk
Since the Fund will typically hold both long and short positions, an investment in the Fund will involve market risks associated with different types of investment decisions than those made for a typical “long only” fund. The Fund’s results could suffer both when there is a general market advance and the Fund holds significant “short” positions, and when there is a general market decline and the Fund holds significant “long” positions.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Market Timing Risk  
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Market Timing Risk
The Fund is subject to the risk of market timing activities by investors due to the nature of the Fund’s investments, which requires the Fund, in certain instances, to fair value certain of its investments. Some investors may engage in frequent short-term trading in the Fund to take advantage of any price differentials that may be reflected in the net asset value (“NAV”) of the Fund’s shares. Frequent trading by Fund shareholders poses risks to other shareholders in the Fund, including (i) the dilution of the Fund’s NAV, (ii) an increase in the Fund’s expenses, and (iii) interference with the ability to execute efficient investment strategies.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Valuation Risk  
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Valuation Risk
Certain of the Fund’s assets may be valued at a price different from the price at which they can be sold. This risk may be especially pronounced for investments that are illiquid or may become illiquid, or securities that trade in relatively thin markets and/or markets that experience extreme volatility. The valuation of the Fund’s investments in an accurate and timely manner may be impacted by technological issues and/or errors by third party service providers, such as pricing services or accounting agents.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Other Investment Companies Risk  
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Other Investment Companies Risk
To the extent that the Fund invests in shares of other registered investment companies, the Fund will indirectly bear the fees and expenses charged by those investment companies in addition to the Fund’s direct fees and expenses. To the extent the Fund invests in other investment companies that invest in equity securities, fixed-income securities and/or foreign securities, or that track an index, the Fund is subject to the risks associated with the underlying investments held by the investment company or the index fluctuations to which the investment company is subject. The Fund may invest in securities of an investment company advised by the Manager and/or a sub-advisor, with respect to which the Manager and/or sub-advisor also receives a management or advisory fee. The Manager and/or sub-advisor has a financial incentive to invest in an affiliated rather than unaffiliated investment company and thus has a potential conflict between its own financial interest and the Fund’s interest. The Fund will be subject to the risks associated with investments in those companies, including but not limited to the following:
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Exchange-Traded Funds (“ETFs”) Risk. Because ETFs are listed on an exchange, they may be subject to trading halts, may trade at a premium or discount to their net asset value (“NAV”) and may not be liquid. An ETF that tracks an index may not precisely replicate the returns of that index, and an actively-managed ETF’s performance will reflect its adviser’s ability to make investment decisions that are suited to achieving the ETF’s investment objectives. Future legislative or regulatory changes, including changes in taxation, could impact the operation of ETFs.   
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Government Money Market Funds Risk. Investments in government money market funds are subject to interest rate risk, credit risk, and market risk.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Geographic Concentration Risk  
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Geographic Concentration Risk
From time to time, based on market or economic conditions, the Fund may invest a significant portion of its assets in the securities of issuers located in, or with significant economic ties to, a single country or geographic region, which could increase the risk that economic, market, political, business, regulatory, diplomatic, social and environmental conditions in that particular country or geographic region may have a significant impact on the Fund’s performance. Investing in such a manner could cause the Fund’s performance to be more volatile than the performance of more geographically diverse funds. A decline in the economies or financial markets of one country or region may adversely affect the economies or financial markets of another.
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European Securities Risk. The Fund’s performance may be affected by political, social and economic conditions in Europe, such as growth of economic output (the gross national product of the countries in the region), the rate of inflation, the rate at which capital is reinvested into European economies, the success of governmental actions to reduce budget deficits, the resource self-sufficiency of European countries, the monetary exchange rates between European countries, and conflict between European countries. The European financial markets have experienced and may continue to experience volatility and adverse trends due to concerns relating to economic downturns; rising government debt levels and the possible default on government debt; national unemployment in several European countries; public health crises; political unrest; economic sanctions; inflation; energy crises; and war and military conflict, such as the Russian invasion of Ukraine. A default or debt restructuring by any European country could adversely impact holders of that country’s debt and sellers of credit default swaps linked to that country’s creditworthiness, which may be located in other countries. Such a default or debt restructuring could affect exposures to European countries. In addition, issuers have faced difficulties obtaining credit or refinancing existing obligations, and financial markets have experienced extreme volatility and declines in asset values and liquidity. These events have affected the exchange rate of the Euro and may continue to significantly affect European countries.
Responses to financial problems by European governments, central banks, and others, including austerity measures and other reforms, may not produce the desired results, may result in social unrest and may limit future growth and economic recovery or may have unintended consequences. The Fund makes investments in securities of issuers that are domiciled in member states of the European Union (the “EU”). The economies and markets of European countries are often closely connected and interdependent, and events in one country in Europe can have an adverse impact on other European countries. One or more countries may abandon the Euro and/or withdraw from the EU. The impact of these actions, especially if they occur in a disorderly fashion, could be significant and far-reaching. The United Kingdom’s withdrawal from the EU could be an indication that one or more other countries may withdraw from the EU and/or abandon the Euro. These events and actions have affected, and may in the future affect, the value and exchange rate of the Euro and may continue to significantly affect the economies of every country in Europe, including countries that do not use the Euro and non-EU member states.
The continuing effects on the economies of European countries of the Russia/Ukraine war and Russia’s response to sanctions imposed by the  U.S., EU, UK and others, are impossible to predict, but have been and could continue to be significant. For example, exports in Eastern Europe have been disrupted for certain key commodities, pushing commodity prices to record highs. Also, both wholesale energy prices and energy prices charged to consumers in Europe have increased significantly.
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United Kingdom Securities Risk.  The Fund’s exposure to issuers located in, or with economic ties to, the United Kingdom, could expose the Fund to risks associated with investments in the United Kingdom to a greater extent than more geographically diverse funds. Investments in United Kingdom issuers may subject the Fund to regulatory, political, currency, security, and economic risks specific to the United Kingdom. The United Kingdom has one of the largest economies in Europe, and the United States and other European countries are substantial trading partners of the United Kingdom. As a result, the United Kingdom economy may be impacted by changes to the economic condition of the United States and other European countries.
Increasing commodity prices and rising inflation levels caused or exacerbated by the war between Russia and Ukraine recently prompted the United Kingdom government to implement significant policy changes. It is difficult to predict what effects such policies (or the suggestion of such policies) may have and the duration of those effects, which may last for extended periods. These effects may negatively impact broad segments of business and the population and have a significant and rapid negative impact on the performance of the Fund’s investments.
Additionally, the transitional period following the United Kingdom’s departure from the European Union (commonly referred to as “Brexit”) ended on December 31, 2020 and European Union law ceased to have effect in the United Kingdom except to the extent retained by the United Kingdom by unilateral act. The United Kingdom and the European Union then reached a trade agreement that was ratified by all applicable United Kingdom and European Union governmental bodies. The economic effects of Brexit, including certain negative impacts on the ability of the United Kingdom to trade seamlessly with the European Union, are becoming clearer but some political, regulatory and commercial uncertainty in relation to the longer term impacts nevertheless remains to be resolved. Accordingly, there remains a risk that the aftermath of Brexit, including its ongoing effect on the United Kingdom’s relationships with other countries, including the United States, and with the European Union, may negatively impact the value of investments held by the Fund. Although the sub-advisor may hedge the Fund’s currency exposures back to the U.S. dollar, a depreciation of the British pound sterling and/or the Euro in relation to the U.S. dollar could adversely affect the Fund’s investments denominated in British pound sterling or Euros that are not fully hedged regardless of the performance of the underlying issuer.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Preferred Stock Risk  
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Preferred Stock Risk
Preferred stocks are sensitive to movements in interest rates. Preferred stocks may be less liquid than common stocks and, unlike common stocks, participation in the growth of an issuer may be limited. Distributions on preferred stocks generally are payable at the discretion of an issuer and after required payments to bond holders. In certain situations, an issuer may call or redeem its preferred stock or convert it to common stock. The market prices of preferred stocks are generally more sensitive to actual or perceived changes in the issuer’s financial condition or prospects than are the prices of debt securities.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Redemption Risk  
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Redemption Risk
The Fund may experience periods of high levels of redemptions that could cause the Fund to sell assets at inopportune times or at a loss or depressed value. Heavy redemptions could hurt the Fund’s performance. The sale of assets to meet redemption requests may create net capital gains, which could cause the Fund to have to distribute substantial capital gains. Redemption risk is greater to the extent that one or more investors or intermediaries control a large percentage of investments in the Fund. In addition, redemption risk is heightened during periods of declining or illiquid markets. A rise in interest rates or other market developments may cause investors to move out of fixed-income securities on a large scale. During periods of heavy redemptions, the Fund may borrow funds through the interfund credit facility or from a bank line of credit, which may increase costs.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Reliance on Corporate Management and Financial Reporting Risk  
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Reliance on Corporate Management and Financial Reporting  Risk
The sub-advisor may select investments for the Fund in part on the basis of information and data made directly available to the sub-advisor by the issuers of securities or through sources other than the issuers such as collateral pool servicers. The sub-advisor has no ability to independently verify such information and data and is therefore dependent upon the integrity of the management of these issuers and of such servicers and the financial and collateral performance reporting processes in general. Information and data provided regarding a particular issuer may not necessarily contain information that the sub-advisor normally considers when evaluating the investment prospects of a company.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Inflation Index-Linked Securities Risk  
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Inflation Index-Linked Securities Risk
Unlike a conventional bond, whose issuer makes regular fixed interest payments and repays the face value of the bond at maturity, an inflation index-linked security provides principal payments and interest payments that vary as the principal and/or interest are adjusted over time to reflect a rise or a drop in the reference inflation-related index. For inflation index-linked debt securities for which repayment of the original principal upon maturity (as adjusted for inflation) is not guaranteed, the adjusted principal value of the securities repaid at maturity may be less than the original principal value. The value of inflation index-linked securities is expected to change in response to real interest rates, which are in turn tied to the relationship between nominal interest rates and the rate of inflation. There can be no assurance that an inflation index that is used will accurately measure the real rate of inflation. The price of an inflation index-linked security generally falls when real interest rates rise and rises when real interest rates fall. Interest payments on such securities are unpredictable and will fluctuate as the principal and interest are adjusted to reflect movements in the inflation-related index. In periods of deflation, the Fund may have no income at all from such investments. The principal value of an investment in the Fund is not protected or otherwise guaranteed by the value of the Fund’s investments in inflation index-linked securities.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Restricted Securities Risk  
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Restricted Securities Risk
Securities not registered in the U.S. under the Securities Act of 1933, as amended (the “Securities Act”), or in non-U.S. markets pursuant to similar regulations, including “Section 4(a)(2)” securities and “Rule 144A” securities, are restricted as to their resale. Such securities may not be listed on an exchange and may have no active trading market. The prices of these securities may be more difficult to determine than publicly traded securities and these securities may involve heightened risk as compared to investments in securities of publicly traded companies. They may be more difficult to purchase or sell at an advantageous time or price because such securities may not be readily marketable in broad public markets or may have to be held for a certain time period before they can be resold. The Fund may not be able to sell a restricted security when the sub-advisor considers it desirable to do so and/or may have to sell the security at a lower price than the Fund believes is its fair market value. In addition, transaction costs may be higher for restricted securities and the Fund may receive only limited information regarding the issuer of a restricted security. The Fund may have to bear the expense of registering restricted securities for resale and the risk of substantial delays in effecting the registration.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Secured, Partially Secured and Unsecured Obligation Risk  
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Secured, Partially Secured and Unsecured Obligation Risk
Debt obligations may be secured, partially secured or unsecured. Interests in secured and partially-secured obligations have the benefit of collateral and, typically, of restrictive covenants limiting the ability of the borrower to further encumber its assets. However, there is no assurance that the liquidation of collateral from a secured or partially-secured obligation would satisfy the borrower’s obligation, or that the collateral can be liquidated. Furthermore, there is a risk that the value of any collateral securing an obligation in which the Fund has an interest may decline and that the collateral may not be sufficient to cover the amount owed on the obligation. In the event the borrower defaults, the Fund’s access to the collateral may be limited or delayed by bankruptcy or other insolvency laws. Unsecured debt, including senior unsecured and subordinated debt, will not be secured by any collateral and will be effectively subordinated to a borrower’s secured indebtedness (to the extent of the collateral securing such indebtedness). With respect to unsecured obligations, the Fund lacks any collateral on which to foreclose to satisfy its claim in whole or in part. Such instruments generally have greater price volatility than that of fully secured holdings and may be less liquid.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Securities Selection Risk  
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Securities Selection Risk
Securities selected for the Fund may not perform to expectations. This could result in the Fund’s underperformance compared to its performance index(es), or other funds with similar investment objectives or strategies.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Short Position Risk  
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Short Position Risk
The Fund will incur a loss as a result of a short position if the price of the instrument sold short increases in value between the date of the short sale and the date on which an offsetting position is purchased. Short positions may be considered speculative transactions and involve special risks, including greater reliance on the sub-advisor’s ability to accurately anticipate the future value of a security or instrument. As there is potentially no limit on the amount that the security that the Fund is required to purchase may have appreciated, the Fund’s losses are potentially unlimited in a short position transaction, particularly in cases where the Fund is unable to close out its short position. The Fund may invest the proceeds of a short sale and, therefore, be subject to the effect of leverage, in that short selling may amplify changes in the Fund’s NAV since it may increase the exposure of the Fund to certain markets and may increase losses and the volatility of returns.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Leverage Risk  
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Leverage Risk
The Fund’s use of derivative instruments and taking of short positions may have the economic effect of financial leverage. Financial leverage magnifies the Fund’s exposure to the movements in prices of an asset or class of assets underlying a derivative instrument and may result in increased volatility, which means that the Fund will have the potential for greater losses than if the Fund does not use the derivative instruments that have a leveraging effect. Leverage may result in losses that exceed the amount originally invested and may accelerate the rate of losses. Leverage tends to magnify, sometimes significantly, the effect of any increase or decrease in the Fund’s exposure to an asset or class of assets and may cause the Fund’s net asset value (“NAV”) per share to be volatile. There can be no assurance that the Fund’s use of leverage will be successful.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Trust Preferred Securities Risk  
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Risk [Text Block]
Trust Preferred Securities Risk
Trust preferred securities are subject to market risk, interest rate risk and credit risk. Holders of the trust preferred securities have limited voting rights to control the activities of the trust and no voting rights with respect to the parent company. Trust preferred securities prices fluctuate for several reasons, including changes in the financial condition of an issuer, investors’ perception of the financial condition of an issuer, or the general economic condition of the market for trust preferred securities.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Loan Interests Risk  
Prospectus [Line Items]  
Risk [Text Block]
Loan Interests Risk
In making investments in bank loans or senior loans, the Fund will depend primarily on the creditworthiness of the borrower for payment of principal and interest and will also rely on the financial institution to make principal and interest payments to the Fund once it receives payment on the underlying loan. The Fund will also rely on the financial institution to pursue appropriate remedies against a borrower in the event that the borrower defaults. As such, the Fund may be exposed to the credit risk of both the financial institution that made the loan and the underlying borrower.
Unlike publicly traded common stocks, which trade on national exchanges, there is no central place or exchange for loans, including bank loans and senior loans, to trade. There is a risk that the value of any collateral securing a loan in which the Fund has an interest may decline and that the collateral may not be sufficient to cover the amount owed on the loan. In the event that the borrower defaults, the Fund’s access to the collateral may be limited or delayed by bankruptcy or other insolvency laws. Loans trade in an over-the-counter market, and confirmation and settlement, which are effected through standardized procedures and documentation, may take significantly longer than seven days to complete. Extended trade settlement periods may, in unusual market conditions with a high volume of shareholder redemptions, present a risk to shareholders with respect to the Fund’s ability to pay redemption proceeds within the allowable time periods stated in the Prospectus. The secondary market for loans also may be subject to irregular trading activity and wide bid/ask spreads. The lack of an active trading market for certain loans may impair the ability of the Fund to sell its loan interests at a time when it may otherwise be desirable to do so or may require the Fund to sell them at prices that are less than what the Fund regards as their fair market value and may make it difficult to value such loans. Accordingly, loan interests may at times be illiquid. Interests in loans made to finance highly leveraged companies or transactions, such as corporate acquisitions, may be especially vulnerable to adverse changes in economic or market conditions.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Unrated Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]
Unrated Securities Risk
Because the Fund may purchase securities that are not rated by any rating organization,  the sub-advisor, after assessing their credit quality, may internally assign ratings to certain of those securities in categories similar to those of rating organizations. Unrated securities are subject to the risk that the sub-advisor may not accurately evaluate the security’s comparative credit rating. Some unrated securities may not have an active trading market or may be difficult to value, which means the Fund might have difficulty selling them promptly at an acceptable price. Unrated securities may be subject to greater liquidity risk and price volatility.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Variable and Floating Rate Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]
Variable and Floating Rate Securities Risk
The coupons on variable and floating-rate securities are not fixed and may fluctuate based upon changes in market rates. A variable rate security has a coupon that is adjusted at pre-designated periods in response to changes in the market rate of interest on which the coupon is based. The coupon on a floating rate security is generally based on an interest rate, such as a money-market index, Secured Overnight Financing Rate (“SOFR”), or a Treasury bill rate. Variable and floating rate securities are subject to interest rate risk and credit risk. As short-term interest rates decline, the coupons on variable and floating-rate securities typically decrease. Alternatively, during periods of rising short-term interest rates, the coupons on variable and floating-rate securities typically increase. Changes in the coupons of variable and floating-rate securities may lag behind changes in market rates or may have limits on the maximum increases in the coupon rates. The value of variable and floating-rate securities may decline if their coupons do not rise as much, or as quickly, as interest rates in general. Conversely, variable and floating rate securities will not generally increase in value if interest rates decline. Certain types of variable and floating rate instruments may be subject to greater liquidity risk than other debt securities.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Zero Coupon Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]
Zero Coupon Securities Risk
Zero coupon securities are debt securities that do not make periodic interest payments prior to maturity or a specified redemption date (or cash payment date). Accordingly, zero coupon securities usually trade at a deep discount from their face or par value and will be subject to greater fluctuations in market value in response to changing interest rates than debt obligations of comparable  maturities that make current distribution of interest in cash. While interest payments are not made on such securities, the Fund accrues income with respect to these securities for federal income tax and accounting purposes. Longer term zero-coupon bonds are more exposed to interest rate risk than shorter term zero coupon bonds.
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STRIPS Risk. The risks of STRIPS are similar to those of other U.S. government securities, although the market values of STRIPS may be more volatile than that of U.S. Treasuries with comparable maturities. Since STRIPS do not entitle the holder to any periodic coupon payments prior to maturity, such securities usually trade at a deep discount from their face or par value and will be subject to greater fluctuations in market value in response to changing interest rates than debt obligations with comparable maturities that make periodic coupon payments in cash.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Mortgage-Backed and Mortgage-Related Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]
Mortgage-Backed and  Mortgage-Related Securities Risk
Investments in mortgage-backed and mortgage-related securities are influenced by the factors affecting the mortgages underlying the securities or the housing market. These securities tend to be more sensitive to changes in interest rates than other types of debt securities. Investments in mortgage-backed and mortgage-related securities also are subject to market risks for fixed-income securities, which include, but are not limited to, credit risk, interest rate risk, prepayment and extension risk, callable securities risk, valuation risk, liquidity risk, and restricted securities risk. A decline in the credit quality of the issuers of
mortgage-backed and mortgage-related securities or instability in the markets for such securities may affect the value and liquidity of such securities, which could result in losses to the Fund. These securities are also subject to the risk of default on the underlying mortgages, particularly during periods of market downturn, and an unexpectedly high rate of defaults on the underlying assets will adversely affect the security’s value. In addition, certain mortgage-backed and mortgage-related securities may include securities backed by pools of loans made to “subprime” borrowers or borrowers with blemished credit histories; the risk of defaults is generally higher in the case of mortgage pools that include such subprime mortgages.
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Collateralized Mortgage Obligation (“CMOs”) Risk. CMOs may offer a higher yield than U.S. government securities, but they may also be subject to greater price fluctuation and credit risk. In addition, CMOs typically will be issued in a variety of classes or series, which have different maturities and are retired in sequence. In the event of a default by an issuer of a CMO, there is no assurance that the collateral securing such CMO will be sufficient to pay principal and interest. It is possible that there will be limited opportunities for trading CMOs in the OTC market, the depth and liquidity of which will vary from time to time.
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Commercial Mortgage-Backed Securities (“CMBS”) Risk. CMBS reflect the risks of investing in the real estate securing the underlying mortgage loans. These risks reflect the effects of local and other economic conditions on real estate markets, the ability of borrowers to make loan payments, and the ability of a property to attract and retain tenants. CMBS may not be backed by the full faith and credit of the U.S. Government and are subject to risk of default on the underlying mortgages, particularly during periods of economic downturn. CMBS are subject to a greater degree of prepayment and extension risk than many other forms of fixed-income securities, and CMBS may be less liquid and exhibit greater price volatility than other types of mortgage- or asset-backed securities. Small movements in interest rates (both increases and decreases) may quickly and significantly reduce the value of CMBS.
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Mortgage Pass-Through Securities Risk. Mortgage pass-through securities provide for the “pass through” of the monthly payments made by individual borrowers on their residential or commercial mortgage loans, net of any fees by the security issuer and guarantor, as applicable, to the holder of the security. Mortgage pass-through securities are sensitive to interest rate changes, and small movements in interest rates, both increases and decreases, may quickly and significantly affect the value of certain mortgage pass-through securities. Mortgage pass-through securities involve interest rate risk, credit risk, prepayment risk and extension risk.
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Residential Mortgage-Backed Securities (“RMBS”) Risk. RMBS include securities that reflect an interest in pools of residential mortgage loans secured by residential real property. While subject to the risks generally associated with mortgage-backed securities, RMBS are particularly susceptible to prepayment risks. Homeowners frequently refinance high-rate mortgages when mortgage rates fall, which results in the prepayment of high-rate mortgages. Conversely, when mortgage rates increase, prepayments from refinancing arrangements decline, extending the life of RMBS with lower yields. RMBS may not be backed by the full faith and credit of the U.S. government and are subject to risk of default on the underlying mortgages. The rate of delinquencies and defaults on RMBS and the amount of the resulting losses depend on a number of factors: many of the risks of investing in the real estate securing the underlying mortgage loans, including general economic conditions and local economic conditions in the geographic area where the mortgaged property is located, the terms of the mortgage loan, the borrower’s equity in the mortgaged property, and the financial circumstances of the borrower. RMBS issued by non-government entities may offer higher yields than those issued by government entities, but also may be subject to greater volatility than government issues. RMBS backed by subprime loans may suffer significantly greater declines in value due to defaults or the increased risk of default.  
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Prepayment and Extension Risk  
Prospectus [Line Items]  
Risk [Text Block]
Prepayment and Extension Risk
Prepayment and extension risk is the risk that a bond or other fixed-income security or investment might, in the case of prepayment risk, be called or otherwise converted, prepaid or redeemed before maturity and, in the case of extension risk, that the investment might not be prepaid as expected. Due to a decline in interest rates or excess cash flow into the issuer, a debt security may be called or otherwise converted, prepaid or redeemed before maturity. If this occurs, no additional interest will be paid on the investment. The Fund may have to reinvest the proceeds in another investment at a lower rate, may not benefit from an increase in value that may result from declining interest rates, and may lose any premium it paid to acquire the security, any of which could result in a reduced yield to the Fund. The rate of prepayments tends to increase as interest rates fall, which could cause the average maturity of the portfolio to shorten. Conversely, extension risk is the risk that a decrease in prepayments may, as a result of higher interest rates or other factors, result in the extension of a security’s effective maturity, increase the risk of default or delayed payment, heighten interest rate risk and increase the potential for a decline in an investment’s price. In addition, as a consequence of a decrease in prepayments, the amount of principal available to the Fund for investment would be reduced. Extensions of obligations could cause the Fund to exhibit additional volatility and hold securities paying lower-than-market rates of interest. Either case could hurt the Fund’s performance.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Segregated Assets Risk  
Prospectus [Line Items]  
Risk [Text Block]
Segregated Assets Risk
In connection with certain transactions that may give rise to future payment obligations, the Fund may be required to maintain a segregated amount of, or otherwise earmark, cash or liquid securities to cover the obligation. Segregated assets generally cannot be sold while the position they are covering is outstanding, unless they are replaced with other assets of equal value. The need to segregate cash or other liquid securities could limit the Fund’s ability to pursue other opportunities as they arise.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Sovereign and Quasi-Sovereign Debt Risk  
Prospectus [Line Items]  
Risk [Text Block]
Sovereign and Quasi-Sovereign Debt Risk
Sovereign or quasi-sovereign debt securities are subject to risk of payment delays or defaults due to, among other things: (1) country cash flow problems, (2) insufficient foreign currency reserves, (3) political considerations, (4) large debt positions relative to the country’s economy, (5) policies toward foreign lenders or investors, (6) the failure to implement economic reforms required by the International Monetary Fund or other multilateral agencies, or (7) an inability or unwillingness to repay debts. It may be particularly difficult to enforce the rights of debt holders in emerging markets. A governmental entity that defaults on an obligation may request additional time in which to repay loans, may request further loans, or may seek to restructure its obligations to reduce interest rates or outstanding principal. There is no legal process for collecting sovereign and quasi-sovereign debt that a government does not pay, nor are there bankruptcy proceedings through which all or part of the sovereign debt that a governmental entity has not repaid may be collected. Sovereign and quasi-sovereign debt risk is increased for emerging markets issuers, which are among the largest debtors to commercial banks and foreign governments. At times, certain emerging market countries have declared moratoria on the payment of principal and interest on external debt. Certain emerging market countries have experienced difficulty in servicing their sovereign debt on a timely basis, which has led to defaults and the restructuring of certain indebtedness.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | Supranational Risk  
Prospectus [Line Items]  
Risk [Text Block]
Supranational Risk
Obligations of supranational entities are subject to the risk that the governments on whose support the entity depends for its financial backing or repayment may be unable or unwilling to provide that support. Political changes in principal donor nations may also unexpectedly disrupt the finances of supranational entities. Obligations of a supranational entity that are denominated in non-U.S. currencies will also be subject to the risks associated with investments in non-U.S. currencies.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | U.S. Government Securities and Government-Sponsored Enterprises Risk  
Prospectus [Line Items]  
Risk [Text Block]
U.S. Government Securities and Government-Sponsored Enterprises Risk
A security backed by the U.S. Treasury or the full faith and credit of the United States is guaranteed only as to the timely payment of coupons and the face value at maturity, not its current market price. The market prices for such securities are not guaranteed and will fluctuate. Certain securities held by the Fund that are issued by government-sponsored enterprises, such as the Federal National Mortgage Association (‘‘Fannie Mae’’), Federal Home Loan Mortgage Corporation (‘‘Freddie Mac’’), Federal Home Loan Bank (‘‘FHLB’’), and Federal Farm Credit Bank (“FFCB”), are not guaranteed by the U.S. Treasury and are not backed by the full faith and credit of the U.S. government, and no assurance can be given that the U.S. government will provide financial support if these organizations do not have the funds to meet future payment obligations. U.S. government securities and securities of government-sponsored enterprises are also subject to credit risk, interest rate risk and market risk. The rising U.S. national debt may lead to adverse impacts on the value of U.S. government securities due to potentially higher costs for the U.S. government to obtain new financing. It is possible that the U.S. government and government-sponsored enterprises will not have the funds to meet their payment obligations in the future.
AB TwentyFour Funds | American Beacon TwentyFour Strategic Income Fund | U.S. Treasury Obligations Risk  
Prospectus [Line Items]  
Risk [Text Block]
U.S. Treasury Obligations Risk
The market value of U.S. Treasury obligations may vary due to fluctuations in interest rates. In addition, changes to the financial condition or credit rating of the U.S. government may cause the value of the Fund’s investments in obligations issued by the U.S. Treasury to decline. Certain political events in the U.S., such as a prolonged government shutdown or potential default on the national debt, may also cause investors to lose confidence in the U.S. government and may cause the value of U.S. Treasury obligations to decline.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] There is no assurance that the Fund will achieve its investment objectives, and you could lose part or all of your investment in the Fund.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items]  
Risk [Text Block] An investment in the Fund is not a deposit with a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Allocation Risk  
Prospectus [Line Items]  
Risk [Text Block]
Allocation Risk
The allocations among strategies, asset classes and market exposures may be less than optimal and may adversely affect the Fund’s performance. There can be no assurance, particularly during periods of market disruption and stress, that judgments about allocations will be correct. The Fund’s allocations may be invested in strategies, asset classes and market exposures during a period when such strategies, asset classes and market exposures underperform.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Callable Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]
Callable Securities Risk
The Fund may invest in fixed-income securities with call features. A call feature allows the issuer of the security to redeem or call the security prior to its stated maturity date. In periods of falling interest rates, issuers may be more likely to call in securities that are paying higher coupon rates than prevailing interest rates. In the event of a call, the Fund would lose the income that would have been earned to maturity on that security, and the proceeds received by the Fund may be invested in securities paying lower coupon rates and may not benefit from any increase in value that might otherwise result from declining interest rates.  
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Convertible Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]
Convertible Securities Risk
The value of a convertible security, including a convertible preferred security, typically increases or decreases with the price of the underlying common stock. In general, a convertible security is subject to the market risks of stocks when the underlying stock’s price is high relative to the conversion price and is subject to the market risks of debt securities when the underlying stock’s price is low relative to the conversion price. The general market risks of debt securities that are common to convertible securities include, but are not limited to, interest rate risk and credit risk. Many convertible securities have credit ratings that are below investment grade and are subject to the same risks as an investment in below investment grade debt securities (commonly known as “junk bonds”). Lower-rated debt securities may fluctuate more widely in price and yield than investment grade debt securities and may fall in price during times when the economy is weak or is expected to become weak. Convertible securities are subject to the risk that the credit standing of the issuer may have an effect on the convertible security‘s investment value. Convertible securities are sensitive to movement in interest rates.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Counterparty Risk  
Prospectus [Line Items]  
Risk [Text Block]
Counterparty Risk
The Fund is subject to the risk that a party or participant to a transaction, such as a broker or a derivative counterparty, will be unwilling or unable to satisfy its obligation to make timely principal, interest or settlement payments or to otherwise honor its obligations to the Fund.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Credit Risk  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk
The Fund is subject to the risk that the issuer, guarantor or insurer of an obligation, or the counterparty to a transaction, may fail, or become less able or unwilling, to make timely payment of interest or principal or otherwise honor its obligations or default completely. Changes in the actual or perceived creditworthiness of an issuer, or a downgrade or default affecting any of the Fund’s securities, could affect the Fund’s performance. Generally, the longer the maturity and the lower the credit quality of a security, the more sensitive it is to credit risk.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Currency Risk  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk
The Fund may have exposure to foreign currencies. Foreign currencies may fluctuate significantly over short periods of time, may be affected unpredictably by intervention, or the failure to intervene, of the  U.S. or foreign governments or central banks, and may be affected by currency controls or political developments in the U.S. or abroad. Foreign currencies may also decline in value relative to the U.S. dollar and other currencies and thereby affect the Fund’s investments.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Cybersecurity and Operational Risk  
Prospectus [Line Items]  
Risk [Text Block]
Cybersecurity and Operational Risk
Operational risks arising from, among other problems, human errors, systems and technology disruptions or failures, or cybersecurity incidents may negatively impact the Fund, its service providers and third-party fund distribution platforms, including the ability of shareholders to transact in the Fund’s shares, and result in financial losses. Cybersecurity incidents may allow an unauthorized party to gain access to Fund assets, shareholder data, or proprietary information, or cause the Fund or its service providers, as well as securities trading venues and their service providers, to suffer data corruption or lose operational functionality. Cybersecurity incidents can result from deliberate attacks or unintentional events. It is not possible for the Fund or its service providers to identify all of the operational risks that may affect the Fund or to develop processes and controls to completely eliminate or mitigate their occurrence or effects. The Fund cannot control the cybersecurity and operational plans and systems of its service providers, its counterparties or the issuers of securities in which the Fund invests. The issuers of the Fund’s investments are likely to be dependent on computers for their operations and require ready access to their data and the internet to conduct their business. Thus, cybersecurity incidents could also affect issuers of the Fund’s investments, leading to significant loss of value.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Debentures Risk  
Prospectus [Line Items]  
Risk [Text Block]
Debentures Risk
Debentures are unsecured debt securities. The holder of a debenture is protected only by the general creditworthiness of the issuer. The Fund may invest in both corporate and government debentures.  
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Environmental, Social, and/or Governance Investing Risk  
Prospectus [Line Items]  
Risk [Text Block]
Environmental, Social, and/or Governance Investing Risk
The use of environmental, social, and/or governance (“ESG”) considerations by  the sub-advisor may cause the Fund to make different investments than funds that have a similar investment style but do not incorporate such considerations in their strategy. As with the use of any investment considerations involved in investment decisions, there is no guarantee that the use of any ESG investment considerations will result in the selection of issuers that will outperform other issuers or help reduce risk in the Fund. The Fund may choose not to, or may not be able to, take advantage of certain investment opportunities due to these considerations, which may adversely affect investment performance. The Fund may underperform funds that do not incorporate these considerations or incorporate different ESG considerations. Although the  sub-advisor has established its own process to oversee ESG integration in accordance with the Fund’s strategies, successful integration of ESG factors will depend on the  sub-advisor’s skill in researching, identifying, and applying these factors, as well as on the availability of relevant data. The sub-advisor may use ESG research and/or ratings information provided by one or more third parties in performing this analysis and considering ESG risks. The regulatory landscape with respect to ESG investing in the United States is evolving and any future rules or regulations may require the Fund to change its investment process with respect to the integration of ESG factors.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Derivatives Risk  
Prospectus [Line Items]  
Risk [Text Block]
Derivatives Risk
Derivatives may involve significant risk. The use of derivative instruments may expose the Fund to additional risks that it would not be subject to if it invested directly in the securities or other instruments underlying those derivatives, including the high degree of leverage often embedded in such instruments, and potential material and prolonged deviations between the theoretical value and realizable value of a derivative. The use of derivatives may also increase any adverse effects resulting from the underperformance of strategies, asset classes and market exposures to which the Fund has allocated its assets. Derivatives may at times be highly illiquid, and the Fund may not be able to close out or sell a derivative at a particular time or at an anticipated price. Certain derivatives may be difficult to value, and valuation may be more difficult in times of market turmoil. Derivatives may also be more volatile than other types of investments. Derivative investments can increase portfolio turnover and transaction costs. Derivatives also are subject to counterparty risk  and credit risk. As a result, the Fund may not recover its investment or may only obtain a limited recovery, and any recovery may be delayed.  Not all derivative transactions require a counterparty to post collateral, which may expose the Fund to greater losses in the event of a default by a counterparty. Derivatives transactions requiring the Fund to post collateral may expose the Fund to greater losses in the event of a default by a counterparty.  There may be imperfect correlation between the behavior of a derivative and that of the reference instrument underlying the derivative. An abrupt change in the price of a reference instrument could render a derivative worthless. Derivatives may involve risks different from, and possibly greater than, the risks associated with investing directly in the reference instrument. The Fund may buy or sell derivatives not traded on an exchange, which may be subject to heightened  counterparty, liquidity and valuation risks. Suitable derivatives may not be available in all circumstances, and there can be no assurance that the Fund will use derivatives to reduce exposure to other risks when that might have been beneficial. Ongoing changes to the regulation of derivatives and changes in the regulation of funds using derivative instruments could limit the Fund’s ability to pursue its investment strategies. New regulation of derivatives may make them more costly, or may otherwise adversely affect their liquidity, value or performance.  In addition, the Fund’s investments in derivatives are subject to the following risks:
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Forward Contracts Risk. Forward contracts, including NDFs,   are derivative instruments pursuant to a contract where the parties agree to a fixed price for an agreed amount of securities or other underlying assets at an agreed date or to buy or sell a specific currency at a future date at a price set at the time of the contract. Not all forward contracts, including  NDFs, require a counterparty to post collateral, which may expose the Fund to greater losses in the event of a default by a counterparty. Forward contracts involving currency include the risks associated with fluctuations in currency. The use of forward contracts may expose the Fund to additional risks, such as credit risk, liquidity risk, and counterparty risk, that it would not be subject to if it invested directly in the securities or currencies underlying the forward contract.  There are no limitations on daily price movements of forward contracts. There can be no assurance that any strategy used will succeed.
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Foreign Currency Forward Contracts Risk. Foreign currency forward contracts, including non-deliverable forwards (“NDFs”), are derivative instruments pursuant to a contract where the parties agree to a fixed price for an agreed amount of foreign currency at an agreed date or to buy or sell a specific currency at a future date at a price set at the time of the contract and include the risks associated with fluctuations in currency. There are no limitations on daily price movements of forward contracts. There can be no assurance that any strategy used will succeed. Not all forward contracts, including NDFs, require a counterparty to post collateral, which may expose the Fund to greater losses in the event of a default by a counterparty. The use of foreign currency forward contracts may expose the Fund to additional risks, such as credit risk, liquidity risk, and counterparty risk, that it would not be subject to if it invested directly in the securities or currencies underlying the foreign currency forward contract. There are no limitations on daily price movements of forward contracts. There can be no assurance that any strategy used will succeed.
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Futures Contracts Risk. Futures contracts are derivative instruments pursuant to a contract where the parties agree to a fixed price for an agreed amount of securities or other underlying assets at an agreed date. The use of such derivative instruments may expose the Fund to additional risks, such as liquidity risk and counterparty risk, that it would not be subject to if it invested directly in the securities underlying those derivatives. There can be no assurance that any strategy used will succeed. There may at times be an imperfect correlation between the movement in the prices of futures contracts and the value of their underlying instruments or indexes. There also can be no assurance that, at all times, a liquid market will exist for offsetting a futures contract that the Fund has previously bought or sold, and this may result in the inability to close a futures contract when desired. Futures contracts may experience potentially dramatic price changes, which will increase the volatility of the Fund and may involve a small investment of cash (the amount of initial and variation margin) relative to the magnitude of the risk assumed (the potential increase or decrease in the price of the futures contract). The Fund may invest in the following types of futures contracts:
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Government Bond Futures Contracts Risk. Government bond futures contracts, such as treasury futures contracts, expose  the  Fund to price fluctuations resulting from changes in interest rates and to potential losses if interest rates do not move as expected.
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Index Futures Contracts Risk. Futures contracts on indices expose the Fund to volatility in an underlying index.   
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Interest Rate Futures Contracts Risk. Interest rate futures contracts expose the Fund to price fluctuations resulting from changes in interest rates. The Fund could suffer a loss if interest rates rise after the Fund has purchased an interest rate futures contract or fall after the Fund has sold an interest rate futures contract.
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Options Risk. An option is a contract that gives the purchaser (holder) of the option, in return for a premium, the right to buy from (call) or sell to (put) the seller (writer) of the option the asset underlying the option at a specified exercise price at any time during the term of the option (normally not exceeding nine months).  The Fund may use non-deliverable options (“NDOs”), which are foreign exchange products designed to assist in reducing the foreign exchange risk, in particular situations when physical delivery of the underlying asset is not required or not possible. There can be no guarantee that the use of options will increase the Fund’s return or income. In addition, there may be an imperfect correlation between the movement in prices of options and the assets underlying them, and there may at times not be a liquid secondary market for options. If an option that the Fund has purchased expires unexercised, the Fund will experience a loss in the amount of the premium it paid. In order for a call option to be profitable, the market price of the underlying asset must rise sufficiently above the call option exercise price to cover the premium and any transaction costs. These costs will reduce any profit that might
otherwise have been realized had the Fund bought the underlying asset instead of the call option. In order for a put option to be profitable, the market price of the underlying asset must decline sufficiently below the put option’s exercise price to cover the premium and any transaction costs. By using put options in this manner, the Fund will reduce any profit it might otherwise have realized from having shorted the declining underlying asset by the premium paid for the put option and by transaction costs.   Options on currencies expose the Fund to the risks associated with investments in currencies.
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Structured Notes Risk. Structured notes are derivative debt instruments with principal and/or interest payments linked to the value of a commodity, a foreign currency, an index of securities, an interest rate, or other financial indicators (“reference instruments”). The payments on a structured note may vary based on changes in one or more specified reference instruments, such as a floating interest rate compared to a fixed interest rate, the exchange rates between two currencies, one or more securities or a securities or commodities index. If the underlying investment or index does not perform as anticipated, the structured note might pay less interest than the stated coupon payment or repay less principal upon maturity. The movement of such factors may cause significant price fluctuations. A structured note may be positively or negatively indexed. Structured notes are subject to interest rate risk, market risk, liquidity risk and counterparty risk. They are also subject to credit risk with respect both to the issuer and, if applicable, to the underlying security or borrower. Structured notes may have a limited trading market, making it difficult to value them or sell them at an acceptable price.
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Swap Agreements Risk. Swap agreements or “swaps” are transactions in which the Fund and a counterparty agree to pay or receive payments at specified dates based upon or calculated by reference to changes in specified prices or rates or the performance of specified securities, indices or other assets based on a specified amount (the “notional” amount). Swaps can involve greater risks than a direct investment in an underlying asset, because swaps typically include a certain amount of embedded leverage and as such are subject to leverage risk.   If swaps are used as a hedging strategy, the Fund is subject to the risk that the hedging strategy may not eliminate the risk that it is intended to offset, due to, among other reasons, the occurrence of unexpected price movements or the non-occurrence of expected price movements.   Swaps also may be difficult to value. Swaps may be subject to liquidity risk and counterparty risk, and swaps that are traded over-the-counter are not subject to standardized clearing requirements and may involve greater liquidity and counterparty risks.   The Fund may invest in the following types of swaps:
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Credit Default Swaps Risk. Credit default swaps may also be subject to credit risk and the risks associated with the purchase and sale of credit protection.
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Currency Swaps Risk. Currency swaps may also be subject to currency risk.
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Interest Rate Swaps Risk. Interest rate swaps may also be subject to interest rate and market risks.  
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Total Return Swaps Risk. Total return swaps may also be subject to market risk and, if the underlying securities are bonds or other debt obligations, interest rate risk.
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Warrants Risk. Warrants are derivative securities that give the holder the right to purchase a specified amount of securities at a specified price. Warrants may be more speculative than certain other types of investments because warrants do not carry with them dividend or voting rights with respect to the underlying securities, or any rights in the assets of the issuer. In addition, the value of a warrant does not necessarily change with the value of the underlying securities, and a warrant ceases to have value if it is not exercised prior to its expiration date. The market for warrants may be very limited and there may at times not be a liquid secondary market for warrants.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Asset Selection Risk  
Prospectus [Line Items]  
Risk [Text Block]
Asset Selection Risk
Assets selected for the Fund may not perform to expectations. This could result in the Fund’s underperformance compared to other funds with similar investment objectives.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Asset-Backed Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]
Asset-Backed Securities Risk
Investments in asset-backed securities are influenced by factors affecting the assets underlying the securities, including the broader market sector and individual markets, such as the auto markets. These securities may be more sensitive to changes in interest rates than other types of debt securities. Investments in asset-backed securities also are subject to risks of fixed-income securities, which include, but are not limited to, credit risk, interest rate risk, prepayment and extension risk, callable securities risk, valuation risk, liquidity risk, and restricted securities risk. A decline in the credit quality of the issuers of asset-backed securities or instability in the markets for such securities may affect the value and liquidity of such securities, which could result in losses to the Fund. These securities are also subject to the risk of default on the underlying assets, particularly during periods of market downturn, and an unexpectedly high rate of defaults on the underlying assets will adversely affect the security’s value.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Collateralized Loan Obligations CLOs Risk  
Prospectus [Line Items]  
Risk [Text Block]
Collateralized Loan Obligations (“CLOs”) Risk
The risks of an investment in a CLO depend largely on the type of underlying collateral and the class or seniority of CLO in which the Fund invests. The Fund typically will invest in CLOs collateralized by bank loans.   Therefore, the CLOs in which the Fund invests will be subject to loan interests risk. In addition, CLOs typically are privately offered and sold, and thus, are not registered under the securities laws. As a result, investments in CLOs may be characterized as illiquid securities. The Fund’s investments in CLOs and other similarly structured investments may expose the Fund to heightened credit risk, interest rate risk, liquidity risk, market risk, and prepayment and extension risk. In addition to these risks, CLOs may also carry additional risks including, but not limited to: (i) the possibility that distributions from collateral securities will not be adequate to make interest or other payments; (ii) the risk that the quality of the collateral may decline in value or default; (iii) the risk that the Fund may invest in CLOs that are subordinate to other classes; (iv) the risk that the complex structure of the security may not be fully understood at the time of investment and may produce disputes with the issuer or unexpected investment results; and (v) the possibility that the CLO’s manager may perform poorly. CLOs may charge management and other administrative fees, which are in addition to those of the Fund. CLOs may be difficult to value and may be highly leveraged, which could make them highly volatile.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Foreign Investing Risk  
Prospectus [Line Items]  
Risk [Text Block]
Foreign Investing Risk
Non-U.S. investments carry potential risks not associated with U.S. investments. Such risks may include, but are not limited to: (1) currency exchange rate fluctuations, (2) political and financial instability, (3) less liquidity, (4) lack of uniform accounting, auditing, recordkeeping and financial reporting standards, (5) greater volatility, (6) different government regulation and supervision of foreign stock exchanges, brokers and listed companies, and (7) delays or failures in transaction payment and settlement in some foreign markets. Additionally, trading in foreign markets generally involves higher transaction costs than trading in U.S. markets. The Fund’s investment in a foreign issuer may subject the Fund to regulatory, political, currency, security, economic and other risks associated with that country, including tariffs, trade disputes and sanctions. Global economic and financial markets have become increasingly interconnected and conditions (including recent volatility, terrorism, war and political instability) and events (including natural disasters) in one country, region or financial market may adversely impact issuers in a different country, region or financial market.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Contingent Convertible Securities CoCos Risk  
Prospectus [Line Items]  
Risk [Text Block]
Contingent Convertible Securities (“CoCos”) Risk
The prices of contingent convertible securities (“CoCos”) may be significantly more volatile during times of market turmoil. CoCos are subordinated debt, and the Fund’s claims will generally be junior to the claims of other creditors if the issuer liquidates or dissolves. Interest payments on CoCos could be canceled by the issuer or a regulator. If the issuer converts the CoCo to an equity security, the Fund would lose interest payments and potentially all income, and the Fund’s investment would be even further subordinated. The issuer could alternatively write down the principal due on the CoCos. The write-down of the security’s par value may occur automatically and would not entitle holders to institute bankruptcy proceedings against the issuer. In addition, an automatic write-down could result in a reduced income rate if the dividend or interest payment associated with the security is based on the security’s par value, or even a complete loss on investment with no chance of recovery even if the issuer remains in existence. CoCos carry the general risks applicable to other fixed income investments, including interest rate risk, credit risk, market risk and liquidity risk.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Hedging Risk  
Prospectus [Line Items]  
Risk [Text Block]
Hedging Risk
If the Fund uses a hedging instrument at the wrong time or judges the market conditions incorrectly, or the hedged instrument does not correlate to the risk sought to be hedged, the hedge might be unsuccessful, reduce the Fund’s return, or create a loss. In addition, hedges, even when successful in mitigating risk, may not prevent the Fund from experiencing losses on its investments. Hedging instruments may also reduce or eliminate gains that may otherwise have been available had the Fund not used the hedging instruments.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | High-Yield Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]
High-Yield Securities Risk
Exposure to high-yield, below investment-grade securities (commonly referred to as “junk bonds”) generally involves significantly greater risks than an investment in investment grade securities. High-yield debt securities may fluctuate more widely in price and yield and may fall in price when the economy is weak or expected to become weak. These securities also may be difficult to sell at the time and price the Fund desires. High-yield securities are considered to be speculative with respect to an issuer’s ability to pay interest and principal and carry a greater risk that the issuers of lower-rated securities will default on the timely payment of principal and interest. High-yield securities may experience greater price volatility and less liquidity than investment grade securities. Issuers of securities that are in default or have defaulted may fail to resume principal or interest payments, in which case the Fund may lose its entire investment.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Interest Rate Risk  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk
Generally, the value of investments with interest rate risk, such as fixed-income securities or derivatives, will move in the opposite direction as movements in interest rates. Factors including central bank monetary policy, rising inflation rates, and changes in general economic conditions may cause interest rates to rise, which could cause the value of the Fund’s investments to decline. Interest rate increases, including significant or rapid increases, may result in a decline in the value of investments   or derivatives held by the Fund, make issuers less willing or able to make principal and interest payments on fixed-income investments when due, lead to heightened volatility in the fixed-income markets and adversely affect the liquidity of certain fixed-income investments, any of which may result in substantial losses to the Fund. When interest rates decline, issuers may prepay higher-yielding securities held by the Fund, resulting in the Fund reinvesting in securities with lower yields, which may cause a decline in its income.   Interest rate changes may have a more pronounced effect on the market value of fixed-rate instruments than on floating-rate instruments. The value of floating rate and variable securities may decline if their interest rates do not rise as quickly, or as much, as general interest rates. The prices of fixed-income securities  or derivatives are also affected by their  durations. Fixed-income securities or derivatives with longer durations generally have greater sensitivity to changes in interest rates than those with shorter durations. Rising interest rates may cause the value of the Fund’s investments with longer durations and terms to maturity to decline, which may adversely affect the value of the Fund. For example, if a bond has a duration of three years, a 1% increase in interest rates could be expected to result in a 3% decrease in the value of the bond. Fluctuations in interest rates may also affect the liquidity of fixed-income securities and instruments held by the Fund.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Investment Risk  
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Risk [Text Block]
Investment Risk
An investment in the Fund is not a deposit with a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. When you sell your shares of the Fund, they could be worth less than what you paid for them. Therefore, you may lose money by investing in the Fund.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Issuer Risk  
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Risk [Text Block]
Issuer Risk
The value of, and/or the return generated by, a security may decline for a number of reasons that directly relate to the issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods or services, as well as the historical and prospective earnings of the issuer and the value of its assets.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Sector Risk  
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Risk [Text Block]
Sector Risk
When the Fund focuses its investments in certain sectors of the economy, its performance could fluctuate more widely than if the Fund were invested more evenly across sectors. Issuers in the same economic sector may be similarly affected by economic or market events, making the Fund more vulnerable to unfavorable developments in that economic sector than funds that invest more broadly. Additionally, individual sectors may be more volatile, and may perform differently, than the broader market. As the Fund’s portfolio changes over time, the Fund’s exposure to a particular sector may become higher or lower.
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Financials Sector Risk. Companies in the Financials sector are subject to extensive governmental regulation and intervention, which may result in financial penalties and limits on the scope of their activities, the amounts and types of loans and other financial commitments they can make, the interest rates and fees they can charge, the scope of their activities, the prices they can charge, the amount of capital they must maintain and, potentially, their size. The impact of recent or future regulation on the Financials sector, including more stringent capital requirements, cannot be predicted. In addition, fiscal, regulatory and monetary policies, economic conditions, interest rate changes, credit rating downgrades, and decreased liquidity in the credit markets may cause an adverse impact in a broad range of markets, including U.S. and international credit and interbank money markets, thereby affecting a wide range of companies in the Financials sector. Cybersecurity incidents and technology malfunctions and failures have become increasingly frequent and have caused significant losses to companies in this sector, which also may negatively impact the Fund.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Liquidity Risk  
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Risk [Text Block]
Liquidity Risk
The Fund is susceptible to the risk that certain investments held by the Fund may have limited marketability, be subject to restrictions on sale, be difficult or impossible to purchase or sell at favorable times or prices or become less liquid in response to market developments or adverse credit events that may affect issuers or guarantors of a security. An inability to sell a portfolio position can adversely affect the Fund’s value or prevent the Fund from being able to take advantage of other investment opportunities. Market prices for such instruments may be volatile. During periods of substantial market volatility, an investment or even an entire market segment may become illiquid, sometimes abruptly, which can adversely affect the Fund’s ability to limit losses. The Fund could lose money if it is unable to dispose of an investment at a time that is most beneficial to the Fund. The Fund may be required to dispose of investments at unfavorable times or prices to satisfy obligations, which may result in losses or may be costly to the Fund.   Unexpected redemptions may force the Fund to sell certain investments at unfavorable prices to meet redemption requests or other cash needs.  Judgment plays a greater role in pricing illiquid investments than in investments with more active markets.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Market Risk  
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Risk [Text Block]
Market Risk
The Fund is subject to the risk that the securities markets will move down, sometimes rapidly and unpredictably, based on overall economic conditions and other factors, which may negatively affect the Fund’s performance. The financial markets generally move in cycles, with periods of rising prices followed by periods of declining prices. The value of your investment may reflect these fluctuations. During a general downturn in the securities markets, multiple asset classes may decline in value simultaneously. Even when certain securities prices have generally increased over time, there have been periods of price decreases during those times, resulting in losses for investors, which are likely to occur again in the future.
Geopolitical and other events, including war, terrorism, trade disputes, pandemics, public health crises, natural disasters, and  cybersecurity incidents, have led, and in the future may continue to lead, to general instability in world economies and markets and reduced liquidity in securities, which may negatively affect the value of your investment.
Policies established by the  U.S. government and/or Federal Reserve and economic and political circumstances within the U.S. and abroad, such as inflation, changes in interest rates, recessions, changes in government leadership, a government’s inability to agree on a budget, high public debt, the threat or occurrence of a federal government shutdown and threats or the occurrence of a failure to increase the federal government’s debt limit, which could result in a default on the government’s obligations, may negatively affect investor and consumer confidence and may negatively impact financial markets and the broader economy, perhaps suddenly and to a significant degree.
Markets and market participants are increasingly reliant upon public and proprietary data and systems. Data or technology malfunctions and inaccuracies may disrupt markets and lead to negative consequences for market participants like the Fund.  
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Recent Market Events Risk. Both U.S. and international markets have experienced significant volatility in recent months and years. As a result of such volatility, investment returns may fluctuate significantly. Moreover, during periods of significant volatility, the risks discussed herein associated with an investment in the Fund may be increased. National economies are substantially interconnected, as are global financial markets, which creates the possibility that conditions in one country or region might adversely impact issuers in a different country or region. However, the interconnectedness of economies and/or markets may be changing, which may impact such economies and markets in ways that cannot be foreseen at this time.
Some countries, including the  U.S., have adopted more protectionist trade policies, including trade tariffs and other trade barriers, which is a trend that appears to be continuing globally. The economies of all nations, including the U.S., are subject to the risks of slowing global economic growth, protectionist trade policies, inflationary pressures, limits imposed by international trade and security agreements, political or economic dysfunction, poor consumer sentiment, and reduced demand for goods due to fluctuating commodity prices and currency values, and these risks may create significant market volatility in ways that cannot be foreseen at the present time. These economic risks could have a negative impact on the Fund’s investments.
The U.S. Federal Reserve and certain foreign central banks may raise or lower interest rates in response to economic or other factors, including inflation. It is
difficult to accurately predict the various economic and political factors that influence interest rate changes, including the direction, pace, timing, frequency or magnitude of any such changes in interest rates. Changes in interest rates could lead to an economic slowdown in the U.S. and abroad, significant market volatility and reduced liquidity in certain sectors of the market.
Tensions, war, or open conflict between nations, such as among the United States, Israel and Iran, between Russia and Ukraine, otherwise in the Middle East or in eastern Asia could affect the economies of many nations, including the United States and may contribute to increased volatility and uncertainty in the financial markets. The extent and duration of ongoing hostilities and related sanctions and the repercussions of such events cannot be predicted. Those events have presented and could continue to present material uncertainty and risk with respect to markets globally, including in the oil and gas markets and potentially other industries and sectors, and the performance of the Fund and its investments or operations could be negatively impacted.  
Advancements in technology, including advanced development and increased regulation of artificial intelligence, may adversely impact market movements and liquidity. As artificial intelligence is used more widely, which can occur relatively rapidly, the profitability and growth of certain issuers and industries may be negatively impacted in ways that cannot be foreseen and could adversely impact issuer and market performance. As a consequence, the Fund’s holdings and its overall performance could be negatively impacted.
Global climate change may affect property and security values. Certain issuers, industries and regions may be adversely affected by the impacts of climate change in ways that cannot be foreseen. The impacts of legislation, regulation and international accords related to climate change, as well as any indirect consequences that may not be foreseen, may negatively impact certain issuers, industries and regions.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Market Timing Risk  
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Risk [Text Block]
Market Timing Risk
The Fund is subject to the risk of market timing activities by investors due to the nature of the Fund’s investments, which requires the Fund, in certain instances, to fair value certain of its investments. Some investors may engage in frequent short-term trading in the Fund to take advantage of any price differentials that may be reflected in the net asset value (“NAV”) of the Fund’s shares. Frequent trading by Fund shareholders poses risks to other shareholders in the Fund, including (i) the dilution of the Fund’s NAV, (ii) an increase in the Fund’s expenses, and (iii) interference with the ability to execute efficient investment strategies.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Valuation Risk  
Prospectus [Line Items]  
Risk [Text Block]
Valuation Risk
Certain of the Fund’s assets may be valued at a price different from the price at which they can be sold. This risk may be especially pronounced for investments that are illiquid or may become illiquid, or securities that trade in relatively thin markets and/or markets that experience extreme volatility. The valuation of the Fund’s investments in an accurate and timely manner may be impacted by technological issues and/or errors by third party service providers, such as pricing services or accounting agents.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Other Investment Companies Risk  
Prospectus [Line Items]  
Risk [Text Block]
Other Investment Companies Risk
To the extent that the Fund invests in shares of other registered investment companies, the Fund will indirectly bear the fees and expenses charged by those investment companies in addition to the Fund’s direct fees and expenses. To the extent the Fund invests in other investment companies that invest in equity securities, fixed-income securities and/or foreign securities, or that track an index, the Fund is subject to the risks associated with the underlying investments held by the investment company or the index fluctuations to which the investment company is subject. The Fund may invest in securities of an investment company advised by the Manager and/or a sub-advisor, with respect to which the Manager and/or sub-advisor also receives a management or advisory fee. The Manager and/or sub-advisor has a financial incentive to invest in an affiliated rather than unaffiliated investment company and thus has a potential conflict between its own financial interest and the Fund’s interest. The Fund will be subject to the risks associated with investments in those companies, including but not limited to the following:
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Exchange-Traded Funds (“ETFs”) Risk. Because ETFs are listed on an exchange, they may be subject to trading halts, may trade at a premium or discount to their net asset value (“NAV”) and may not be liquid. An ETF that tracks an index may not precisely replicate the returns of that index, and an actively-managed ETF’s performance will reflect its adviser’s ability to make investment decisions that are suited to achieving the ETF’s investment objectives. Future legislative or regulatory changes, including changes in taxation, could impact the operation of ETFs.   
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Government Money Market Funds Risk. Investments in government money market funds are subject to interest rate risk, credit risk, and market risk.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Geographic Concentration Risk  
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Risk [Text Block]
Geographic Concentration Risk
From time to time, based on market or economic conditions, the Fund may invest a significant portion of its assets in the securities of issuers located in, or with significant economic ties to, a single country or geographic region, which could increase the risk that economic, market, political, business, regulatory, diplomatic, social and environmental conditions in that particular country or geographic region may have a significant impact on the Fund’s performance. Investing in such a manner could cause the Fund’s performance to be more volatile than the performance of more geographically diverse funds. A decline in the economies or financial markets of one country or region may adversely affect the economies or financial markets of another.
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European Securities Risk. The Fund’s performance may be affected by political, social and economic conditions in Europe, such as growth of economic output (the gross national product of the countries in the region), the rate of inflation, the rate at which capital is reinvested into European economies, the success of governmental actions to reduce budget deficits, the resource self-sufficiency of European countries, the monetary exchange rates between European countries, and conflict between European countries. The European financial markets have experienced and may continue to experience volatility and adverse trends due to concerns relating to economic downturns; rising government debt levels and the possible default on government debt; national unemployment in several European countries; public health crises; political unrest; economic sanctions; inflation; energy crises; and war and military conflict, such as the Russian invasion of Ukraine. A default or debt restructuring by any European country could adversely impact holders of that country’s debt and sellers of credit default swaps linked to that country’s creditworthiness, which may be located in other countries. Such a default or debt restructuring could affect exposures to European countries. In addition, issuers have faced difficulties obtaining credit or refinancing existing obligations, and financial markets have experienced extreme volatility and declines in asset values and liquidity. These events have affected the exchange rate of the Euro and may continue to significantly affect European countries.
Responses to financial problems by European governments, central banks, and others, including austerity measures and other reforms, may not produce the desired results, may result in social unrest and may limit future growth and economic recovery or may have unintended consequences. The Fund makes
investments in securities of issuers that are domiciled in member states of the European Union (the “EU”). The economies and markets of European countries are often closely connected and interdependent, and events in one country in Europe can have an adverse impact on other European countries. One or more countries may abandon the Euro and/or withdraw from the EU. The impact of these actions, especially if they occur in a disorderly fashion, could be significant and far-reaching. The United Kingdom’s withdrawal from the EU could be an indication that one or more other countries may withdraw from the EU and/or abandon the Euro. These events and actions have affected, and may in the future affect, the value and exchange rate of the Euro and may continue to significantly affect the economies of every country in Europe, including countries that do not use the Euro and non-EU member states.
The continuing effects on the economies of European countries of the Russia/Ukraine war and Russia’s response to sanctions imposed by the  U.S., EU, UK and others, are impossible to predict, but have been and could continue to be significant. For example, exports in Eastern Europe have been disrupted for certain key commodities, pushing commodity prices to record highs. Also, both wholesale energy prices and energy prices charged to consumers in Europe have increased significantly.
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United Kingdom Securities Risk.  The Fund’s exposure to issuers located in, or with economic ties to, the United Kingdom, could expose the Fund to risks associated with investments in the United Kingdom to a greater extent than more geographically diverse funds. Investments in United Kingdom issuers may subject the Fund to regulatory, political, currency, security, and economic risks specific to the United Kingdom. The United Kingdom has one of the largest economies in Europe, and the United States and other European countries are substantial trading partners of the United Kingdom. As a result, the United Kingdom economy may be impacted by changes to the economic condition of the United States and other European countries.
Increasing commodity prices and rising inflation levels caused or exacerbated by the war between Russia and Ukraine recently prompted the United Kingdom government to implement significant policy changes. It is difficult to predict what effects such policies (or the suggestion of such policies) may have and the duration of those effects, which may last for extended periods. These effects may negatively impact broad segments of business and the population and have a significant and rapid negative impact on the performance of the Fund’s investments.
Additionally, the transitional period following the United Kingdom’s departure from the European Union (commonly referred to as “Brexit”) ended on December 31, 2020 and European Union law ceased to have effect in the United Kingdom except to the extent retained by the United Kingdom by unilateral act. The United Kingdom and the European Union then reached a trade agreement that was ratified by all applicable United Kingdom and European Union governmental bodies. The economic effects of Brexit, including certain negative impacts on the ability of the United Kingdom to trade seamlessly with the European Union, are becoming clearer but some political, regulatory and commercial uncertainty in relation to the longer term impacts nevertheless remains to be resolved. Accordingly, there remains a risk that the aftermath of Brexit, including its ongoing effect on the United Kingdom’s relationships with other countries, including the United States, and with the European Union, may negatively impact the value of investments held by the Fund. Although the sub-advisor may hedge the Fund’s currency exposures back to the U.S. dollar, a depreciation of the British pound sterling and/or the Euro in relation to the U.S. dollar could adversely affect the Fund’s investments denominated in British pound sterling or Euros that are not fully hedged regardless of the performance of the underlying issuer.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Preferred Stock Risk  
Prospectus [Line Items]  
Risk [Text Block]
Preferred Stock Risk
Preferred stocks are sensitive to movements in interest rates. Preferred stocks may be less liquid than common stocks and, unlike common stocks, participation in the growth of an issuer may be limited. Distributions on preferred stocks generally are payable at the discretion of an issuer and after required payments to bond holders. In certain situations, an issuer may call or redeem its preferred stock or convert it to common stock. The market prices of preferred stocks are generally more sensitive to actual or perceived changes in the issuer’s financial condition or prospects than are the prices of debt securities.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Redemption Risk  
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Risk [Text Block]
Redemption Risk
The Fund may experience periods of high levels of redemptions that could cause the Fund to sell assets at inopportune times or at a loss or depressed value. Heavy redemptions could hurt the Fund’s performance. The sale of assets to meet redemption requests may create net capital gains, which could cause the Fund to have to distribute substantial capital gains. Redemption risk is greater to the extent that one or more investors or intermediaries control a large percentage of investments in the Fund. In addition, redemption risk is heightened during periods of declining or illiquid markets. A rise in interest rates or other market developments may cause investors to move out of fixed-income securities on a large scale. During periods of heavy redemptions, the Fund may borrow funds through the interfund credit facility or from a bank line of credit, which may increase costs.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Reliance on Corporate Management and Financial Reporting Risk  
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Risk [Text Block]
Reliance on Corporate Management and Financial Reporting  Risk
The sub-advisor may select investments for the Fund in part on the basis of information and data made directly available to the sub-advisor by the issuers of securities or through sources other than the issuers such as collateral pool servicers. The sub-advisor has no ability to independently verify such information and data and is therefore dependent upon the integrity of the management of these issuers and of such servicers and the financial and collateral performance reporting processes in general. Information and data provided regarding a particular issuer may not necessarily contain information that the sub-advisor normally considers when evaluating the investment prospects of a company.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Inflation Index-Linked Securities Risk  
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Risk [Text Block]
Inflation Index-Linked Securities Risk
Unlike a conventional bond, whose issuer makes regular fixed interest payments and repays the face value of the bond at maturity, an inflation index-linked security provides principal payments and interest payments that vary as the principal and/or interest are adjusted over time to reflect a rise or a drop in the reference inflation-related index. For inflation index-linked debt securities for which repayment of the original principal upon maturity (as adjusted for inflation) is not guaranteed, the adjusted principal value of the securities repaid at maturity may be less than the original principal value. The value of inflation index-linked securities is expected to change in response to real interest rates, which are in turn tied to the relationship between nominal interest rates and the rate of inflation. There can be no assurance that an inflation index that is used will accurately measure the real rate of inflation. The price of an inflation index-linked security generally falls when real interest rates rise and rises when real interest rates fall. Interest payments on such securities are unpredictable and will fluctuate as the principal and interest are adjusted to reflect movements in the inflation-related index. In periods of deflation, the Fund may have no income at all from such investments. The principal value of an investment in the Fund is not protected or otherwise guaranteed by the value of the Fund’s investments in inflation index-linked securities.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Restricted Securities Risk  
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Risk [Text Block]
Restricted Securities Risk
Securities not registered in the U.S. under the Securities Act of 1933, as amended (the “Securities Act”), or in non-U.S. markets pursuant to similar regulations, including “Section 4(a)(2)” securities and “Rule 144A” securities, are restricted as to their resale. Such securities may not be listed on an exchange and may have no active trading market. The prices of these securities may be more difficult to determine than publicly traded securities and these securities may involve heightened risk as compared to investments in securities of publicly traded companies. They may be more difficult to purchase or sell at an advantageous time or price because such securities may not be readily marketable in broad public markets or may have to be held for a certain time period before they can be resold. The Fund may not be able to sell a restricted security when the sub-advisor considers it desirable to do so and/or may have to sell the security at a lower price than the Fund believes is its fair market value. In addition, transaction costs may be higher for restricted securities and the Fund may receive only limited information regarding the issuer of a restricted security. The Fund may have to bear the expense of registering restricted securities for resale and the risk of substantial delays in effecting the registration.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Secured, Partially Secured and Unsecured Obligation Risk  
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Secured, Partially Secured and Unsecured Obligation Risk
Debt obligations may be secured, partially secured or unsecured. Interests in secured and partially-secured obligations have the benefit of collateral and, typically, of restrictive covenants limiting the ability of the borrower to further encumber its assets. However, there is no assurance that the liquidation of collateral from a secured or partially-secured obligation would satisfy the borrower’s obligation, or that the collateral can be liquidated. Furthermore, there is a risk that the value of any collateral securing an obligation in which the Fund has an interest may decline and that the collateral may not be sufficient to cover the amount owed on the obligation. In the event the borrower defaults, the Fund’s access to the collateral may be limited or delayed by bankruptcy or other insolvency laws. Unsecured debt, including senior unsecured and subordinated debt, will not be secured by any collateral and will be effectively subordinated to a borrower’s secured indebtedness (to the extent of the collateral securing such indebtedness). With respect to unsecured obligations, the Fund lacks any collateral on which to foreclose to satisfy its claim in whole or in part. Such instruments generally have greater price volatility than that of fully secured holdings and may be less liquid.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Securities Selection Risk  
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Risk [Text Block]
Securities Selection Risk
Securities selected for the Fund may not perform to expectations. This could result in the Fund’s underperformance compared to its performance index(es), or other funds with similar investment objectives or strategies.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Leverage Risk  
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Risk [Text Block]
Leverage Risk
The Fund’s use of derivative instruments may have the economic effect of financial leverage. Financial leverage magnifies the Fund’s exposure to the movements in prices of an asset or class of assets underlying a derivative instrument and may result in increased volatility, which means that the Fund will have the potential for greater losses than if the Fund does not use the derivative instruments that have a leveraging effect. Leverage may result in losses that exceed the amount originally invested and may accelerate the rate of losses. Leverage tends to magnify, sometimes significantly, the effect of any increase or decrease in the Fund’s exposure to an asset or class of assets and may cause the Fund’s net asset value (“NAV”) per share to be volatile. There can be no assurance that the Fund’s use of leverage will be successful.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Trust Preferred Securities Risk  
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Trust Preferred Securities Risk
Trust preferred securities are subject to market risk, interest rate risk and credit risk. Holders of the trust preferred securities have limited voting rights to control the activities of the trust and no voting rights with respect to the parent company. Trust preferred securities prices fluctuate for several reasons, including changes in the financial condition of an issuer, investors’ perception of the financial condition of an issuer, or the general economic condition of the market for trust preferred securities.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Loan Interests Risk  
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Loan Interests Risk
In making investments in bank loans or senior loans, the Fund will depend primarily on the creditworthiness of the borrower for payment of principal and interest and will also rely on the financial institution to make principal and interest payments to the Fund once it receives payment on the underlying loan. The Fund will also rely on the financial institution to pursue appropriate remedies against a borrower in the event that the borrower defaults. As such, the Fund may be exposed to the credit risk of both the financial institution that made the loan and the underlying borrower.
Unlike publicly traded common stocks, which trade on national exchanges, there is no central place or exchange for loans, including bank loans and senior loans, to trade. There is a risk that the value of any collateral securing a loan in which the Fund has an interest may decline and that the collateral may not be sufficient to cover the amount owed on the loan. In the event that the borrower defaults, the Fund’s access to the collateral may be limited or delayed by bankruptcy or other insolvency laws. Loans trade in an over-the-counter market, and confirmation and settlement, which are effected through standardized procedures and documentation, may take significantly longer than seven days to complete. Extended trade settlement periods may, in unusual market conditions with a high volume of shareholder redemptions, present a risk to shareholders with respect to the Fund’s ability to pay redemption proceeds within the allowable time periods stated in the Prospectus. The secondary market for loans also may be subject to irregular trading activity and wide bid/ask spreads. The lack of an active trading market for certain loans may impair the ability of the Fund to sell its loan interests at a time when it may otherwise be desirable to do so or may require the Fund to sell them at prices that are less than what the Fund regards as their fair market value and may make it difficult to value such loans. Accordingly, loan interests may at times be illiquid. Interests in loans made to finance highly leveraged companies or transactions, such as corporate acquisitions, may be especially vulnerable to adverse changes in economic or market conditions.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Unrated Securities Risk  
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Unrated Securities Risk
Because the Fund may purchase securities that are not rated by any rating organization,  the sub-advisor, after assessing their credit quality, may internally assign ratings to certain of those securities in categories similar to those of rating organizations. Unrated securities are subject to the risk that the sub-advisor may not accurately evaluate the security’s comparative credit rating. Some unrated securities may not have an active trading market or may be difficult to value, which means the Fund might have difficulty selling them promptly at an acceptable price. Unrated securities may be subject to greater liquidity risk and price volatility.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Variable and Floating Rate Securities Risk  
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Variable and Floating Rate Securities Risk
The coupons on variable and floating-rate securities are not fixed and may fluctuate based upon changes in market rates. A variable rate security has a coupon that is adjusted at pre-designated periods in response to changes in the market rate of interest on which the coupon is based. The coupon on a floating rate security is generally based on an interest rate, such as a money-market index, Secured Overnight Financing Rate (“SOFR”), or a Treasury bill rate. Variable and floating rate securities are subject to interest rate risk and credit risk. As short-term interest rates decline, the coupons on variable and floating-rate securities typically decrease. Alternatively, during periods of rising short-term interest rates, the coupons on variable and floating-rate securities typically increase. Changes in the coupons of variable and floating-rate securities may lag behind changes in market rates or may have limits on the maximum increases in the coupon rates. The value of variable and floating-rate securities may decline if their coupons do not rise as much, or as quickly, as interest rates in general. Conversely, variable and floating rate securities will not generally increase in value if interest rates decline. Certain types of variable and floating rate instruments may be subject to greater liquidity risk than other debt securities.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Zero Coupon Securities Risk  
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Zero Coupon Securities Risk
Zero coupon securities are debt securities that do not make periodic interest payments prior to maturity or a specified redemption date (or cash payment date). Accordingly, zero coupon securities usually trade at a deep discount from their face or par value and will be subject to greater fluctuations in market value in response to changing interest rates than debt obligations of comparable  maturities that make current distribution of interest in cash. While interest payments are not made on such securities, the Fund accrues income with respect to these securities for federal income tax and accounting purposes. Longer term zero-coupon bonds are more exposed to interest rate risk than shorter term zero coupon bonds.
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STRIPS Risk. The risks of STRIPS are similar to those of other U.S. government securities, although the market values of STRIPS may be more volatile than that of U.S. Treasuries with comparable maturities. Since STRIPS do not entitle the holder to any periodic coupon payments prior to maturity, such securities usually trade at a deep discount from their face or par value and will be subject to greater fluctuations in market value in response to changing interest rates than debt obligations with comparable maturities that make periodic coupon payments in cash.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Mortgage-Backed and Mortgage-Related Securities Risk  
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Mortgage-Backed and  Mortgage-Related Securities Risk
Investments in mortgage-backed and mortgage-related securities are influenced by the factors affecting the mortgages underlying the securities or the housing market. These securities tend to be more sensitive to changes in interest rates than other types of debt securities. Investments in mortgage-backed and mortgage-related securities also are subject to market risks for fixed-income securities, which include, but are not limited to, credit risk, interest rate risk, prepayment and extension risk, callable securities risk, valuation risk, liquidity risk, and restricted securities risk. A decline in the credit quality of the issuers of mortgage-backed and mortgage-related securities or instability in the markets for such securities may affect the value and liquidity of such securities, which could result in losses to the Fund. These securities are also subject to the risk of default on the underlying mortgages, particularly during periods of market downturn, and an unexpectedly high rate of defaults on the underlying assets will adversely affect the security’s value.
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Collateralized Mortgage Obligation (“CMOs”) Risk. CMOs may offer a higher yield than U.S. government securities, but they may also be subject to greater price fluctuation and credit risk. In addition, CMOs typically will be issued in a variety of classes or series, which have different maturities and are retired in sequence. In the event of a default by an issuer of a CMO, there is no assurance that the collateral securing such CMO will be sufficient to pay principal and interest. It is possible that there will be limited opportunities for trading CMOs in the OTC market, the depth and liquidity of which will vary from time to time.
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Commercial Mortgage-Backed Securities (“CMBS”) Risk. CMBS reflect the risks of investing in the real estate securing the underlying mortgage loans. These risks reflect the effects of local and other economic conditions on real estate markets, the ability of borrowers to make loan payments, and the ability of a property to attract and retain tenants. CMBS may not be backed by the full faith and credit of the U.S. Government and are subject to risk of default on the underlying mortgages, particularly during periods of economic downturn. CMBS are subject to a greater degree of prepayment and extension risk than many other forms of fixed-income securities, and CMBS may be less liquid and exhibit greater price volatility than other types of mortgage- or asset-backed securities. Small movements in interest rates (both increases and decreases) may quickly and significantly reduce the value of CMBS.
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Mortgage Pass-Through Securities Risk. Mortgage pass-through securities provide for the “pass through” of the monthly payments made by individual borrowers on their residential or commercial mortgage loans, net of any fees by the security issuer and guarantor, as applicable, to the holder of the security. Mortgage pass-through securities are sensitive to interest rate changes, and small movements in interest rates, both increases and decreases, may quickly and significantly affect the value of certain mortgage pass-through securities. Mortgage pass-through securities involve interest rate risk, credit risk, prepayment risk and extension risk.
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Residential Mortgage-Backed Securities (“RMBS”) Risk. RMBS include securities that reflect an interest in pools of residential mortgage loans secured by residential real property. While subject to the risks generally associated with mortgage-backed securities, RMBS are particularly susceptible to prepayment risks. Homeowners frequently refinance high-rate mortgages when mortgage rates fall, which results in the prepayment of high-rate mortgages. Conversely, when mortgage rates increase, prepayments from refinancing arrangements decline, extending the life of RMBS with lower yields. RMBS may not be backed by the full faith and credit of the U.S. government and are subject to risk of default on the underlying mortgages. The rate of delinquencies and defaults on RMBS and the amount of the resulting losses depend on a number of factors: many of the risks of investing in the real estate securing the underlying mortgage loans, including general economic conditions and local economic conditions in the geographic area where the mortgaged property is located, the terms of the mortgage loan, the borrower’s equity in the mortgaged property, and the financial circumstances of the borrower. RMBS issued by non-government entities may offer higher yields than those issued by government entities, but also may be subject to greater volatility than government issues.  
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Prepayment and Extension Risk  
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Prepayment and Extension Risk
Prepayment and extension risk is the risk that a bond or other fixed-income security or investment might, in the case of prepayment risk, be called or otherwise converted, prepaid or redeemed before maturity and, in the case of extension risk, that the investment might not be prepaid as expected. Due to a decline in interest rates or excess cash flow into the issuer, a debt security may be called or otherwise converted, prepaid or redeemed before maturity. If this occurs, no additional interest will be paid on the investment. The Fund may have to reinvest the proceeds in another investment at a lower rate, may not benefit from an increase in value that may result from declining interest rates, and may lose any premium it paid to acquire the security, any of which could result in a reduced yield to the Fund. The rate of prepayments tends to increase as interest rates fall, which could cause the average maturity of the portfolio to shorten. Conversely, extension risk is the risk that a decrease in prepayments may, as a result of higher interest rates or other factors, result in the extension of a security’s effective maturity, increase the risk of default or delayed payment, heighten interest rate risk and increase the potential for a decline in an investment’s price. In addition, as a consequence of a decrease in prepayments, the amount of principal available to the Fund for investment would be reduced. Extensions of obligations could cause the Fund to exhibit additional volatility and hold securities paying lower-than-market rates of interest. Either case could hurt the Fund’s performance.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Segregated Assets Risk  
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Segregated Assets Risk
In connection with certain transactions that may give rise to future payment obligations, the Fund may be required to maintain a segregated amount of, or otherwise earmark, cash or liquid securities to cover the obligation. Segregated assets generally cannot be sold while the position they are covering is outstanding, unless they are replaced with other assets of equal value. The need to segregate cash or other liquid securities could limit the Fund’s ability to pursue other opportunities as they arise.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Sovereign and Quasi-Sovereign Debt Risk  
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Sovereign and Quasi-Sovereign Debt Risk
Sovereign or quasi-sovereign debt securities are subject to risk of payment delays or defaults due to, among other things: (1) country cash flow problems, (2) insufficient foreign currency reserves, (3) political considerations, (4) large debt positions relative to the country’s economy, (5) policies toward foreign lenders or investors, (6) the failure to implement economic reforms required by the International Monetary Fund or other multilateral agencies, or (7) an inability or unwillingness to repay debts. A governmental entity that defaults on an obligation may request additional time in which to repay loans, may request further loans, or may seek to restructure its obligations to reduce interest rates or outstanding principal. There is no legal process for collecting sovereign and quasi-sovereign debt that a government does not pay, nor are there bankruptcy proceedings through which all or part of the sovereign debt that a governmental entity has not repaid may be collected.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Supranational Risk  
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Supranational Risk
Obligations of supranational entities are subject to the risk that the governments on whose support the entity depends for its financial backing or repayment may be unable or unwilling to provide that support. Political changes in principal donor nations may also unexpectedly disrupt the finances of supranational entities. Obligations of a supranational entity that are denominated in non-U.S. currencies will also be subject to the risks associated with investments in non-U.S. currencies.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | U.S. Government Securities and Government-Sponsored Enterprises Risk  
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U.S. Government Securities and Government-Sponsored Enterprises Risk
A security backed by the U.S. Treasury or the full faith and credit of the United States is guaranteed only as to the timely payment of coupons and the face value at maturity, not its current market price. The market prices for such securities are not guaranteed and will fluctuate. Certain securities held by the Fund that are issued by government-sponsored enterprises, such as the Federal National Mortgage Association (‘‘Fannie Mae’’), Federal Home Loan Mortgage Corporation (‘‘Freddie Mac’’), Federal Home Loan Bank (‘‘FHLB’’), and Federal Farm Credit Bank (“FFCB”), are not guaranteed by the U.S. Treasury and are not backed by the full faith and credit of the U.S. government, and no assurance can be given that the U.S. government will provide financial support if these organizations do not have the funds to meet future payment obligations. U.S. government securities and securities of government-sponsored enterprises are also subject to credit risk, interest rate risk and market risk. The rising U.S. national debt may lead to adverse impacts on the value of U.S. government securities due to potentially higher costs for the U.S. government to obtain new financing. It is possible that the U.S. government and government-sponsored enterprises will not have the funds to meet their payment obligations in the future.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | U.S. Treasury Obligations Risk  
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U.S. Treasury Obligations Risk
The market value of U.S. Treasury obligations may vary due to fluctuations in interest rates. In addition, changes to the financial condition or credit rating of the U.S. government may cause the value of the Fund’s investments in obligations issued by the U.S. Treasury to decline. Certain political events in the U.S., such as a prolonged government shutdown or potential default on the national debt, may also cause investors to lose confidence in the U.S. government and may cause the value of U.S. Treasury obligations to decline.
AB TwentyFour Funds | American Beacon TwentyFour Short Term Bond Fund | Small Fund Risk  
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Small Fund Risk
Like other smaller funds, large inflows and outflows may impact the Fund’s market exposure for limited periods of time. Investment positions may also have a disproportionate impact, negative or positive, on performance, and Fund performance may be more volatile than that of a larger fund. The Fund’s shareholder fees and annual fund operating expenses also may be higher than those of a fund that has attracted sufficient assets to achieve investment and trading efficiencies. Shareholders of the Fund may incur higher expenses if the Fund fails to attract sufficient assets to realize economies of scale. Investors in the Fund also bear the risk that, without sufficient assets, the Fund may not be successful in implementing its investment strategy or may not employ a successful investment strategy.