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AB Tax-Aware Short Duration Municipal ETF  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Fixed-Income—Municipal AB Tax‑Aware Short Duration Municipal ETF
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Fund seeks to provide relative stability of principal and a moderate rate of after‑tax return and income.
Expense [Heading] rr_ExpenseHeading FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may be required to pay commissions and/or other forms of compensation to a broker for transactions in shares, which are not reflected in the tables or the examples below.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys or sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Fund Operating Expenses or in the Examples, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 25% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 25.00%
Expense Example [Heading] rr_ExpenseExampleHeading Examples
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
The Examples are intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. The Examples assume that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Examples also assume that your investment has a 5% return each year and that the Fund’s operating expenses stay the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading PRINCIPAL STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund is an actively-managed exchange-traded fund (“ETF”). The Fund pursues its objective by investing principally in a national portfolio of both municipal and taxable fixed-income securities. The Fund invests, under normal circumstances, at least 80% of its total assets in municipal securities that pay interest that is exempt from federal income tax. These securities may pay interest that is subject to the federal alternative minimum tax for certain taxpayers. The income earned and distributed to shareholders on non‑municipal securities would not be exempt from federal income tax. The Fund may invest in fixed-income securities rated below investment grade (commonly known as “junk bonds”), although such securities are not expected to be the Fund’s primary focus. The Fund may invest in securities issued or guaranteed by Puerto Rico or its agencies or instrumentalities.
The Adviser selects securities for the Fund based on a variety of factors, including credit quality, maturity, diversification benefits, and the relative expected after‑tax returns of taxable and municipal securities (considering federal tax rates and without regard to
state and local income taxes). Consistent with the Fund’s objective to provide a moderate rate of after‑tax return, an investor in the Fund may incur a tax liability that will generally be greater than the same investor would have in a fund investing exclusively in municipal securities, and that will be higher if the investor is in a higher tax bracket. In addition, the tax implications of the Fund’s trading activity, such as realizing taxable gains, are considered in making purchase and sale decisions for the Fund. Consistent with the Fund’s investment objective, the Fund could continue to hold a security even if the interest on that security changes from being tax‑exempt to taxable. Under normal circumstances, the Fund will maintain a dollar-weighted average duration of less than three years, although it may invest in securities of any duration or maturity.
The Fund may also invest in forward commitments, and variable and floating-rate municipal securities.
The Fund may use derivatives, primarily swaps, but also options, futures contracts and forwards, to achieve its investment strategies. For example, the Fund may enter into interest rate swaps relating to municipal and taxable fixed-income securities or credit default swaps relating to securities indices. Derivatives may provide more efficient and economical exposure to fixed-income securities markets than direct investments.
The Fund may invest more than 25% of its total assets in securities or obligations that are related in such a way that business or political developments or changes affecting one such security could also affect the others (for example, securities with interest that is paid from projects of a similar type).
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading BAR CHART AND PERFORMANCE INFORMATION
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and performance information provide an indication of the historical risk of an investment in the Fund by showing:
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how the Fund’s performance changed from year to year over the life of the Fund; and
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how the Fund’s average annual returns for one year and since inception compare to those of a broad-based securities market index.
You may obtain updated performance information on the website at www.abfunds.com (click on “Investments—ETFs”).
The Fund’s past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns how the Fund’s performance changed from year to year over the life of the Fund; andhow the Fund’s average annual returns for one year and since inception compare to those of a broad-based securities market index.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.abfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Bar Chart
Bar Chart Narrative [Text Block] rr_BarChartNarrativeTextBlock
The annual returns in the bar chart are for the Fund’s shares.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Calendar Year End (%) During the period shown in the bar chart, the Fund’s: Best Quarter was up 3.51%, 4th quarter, 2023; and Worst Quarter was down -0.74%, 3rd quarter, 2023.
Performance Table Heading rr_PerformanceTableHeading Performance Table Average Annual Total Returns (For the periods ended December 31, 2023)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After‑tax returns:–Are an estimate, which is based on the highest historical individual federal marginal income tax rates, and do not reflect the impact of state and local taxes;
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred actual after‑tax returns depend on an individual investor’s tax situation and are likely to differ from those shown; and– Are not relevant to investors who hold Fund shares through tax‑deferred arrangements such as 401(k) plans or individual retirement accounts.
AB Tax-Aware Short Duration Municipal ETF | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock As with all investments, you may lose money by investing in the Fund.
AB Tax-Aware Short Duration Municipal ETF | Market Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Market Risk: The value of the Fund’s assets will fluctuate as the market or markets in which the Fund invests fluctuate. The value of the Fund’s investments may decline, sometimes rapidly and unpredictably, simply because of economic changes or other events, including public health crises (including the occurrence of a contagious disease or illness), interest rate levels, and regional and global conflicts, that affect large portions of the market.
AB Tax-Aware Short Duration Municipal ETF | Interest Rate Risks [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Interest Rate Risk: Changes in interest rates will affect the value of investments in fixed-income securities. When interest rates rise, the value of existing investments in fixed-income securities tends to fall and this decrease in value may not be offset by higher income from new investments. Interest rate risk is generally greater for fixed-income securities with longer maturities or durations. The Fund may be subject to a greater risk of rising interest rates than would normally be the case due to the recent end of a period of historically low rates and the effects of potential central bank monetary policy, and government fiscal policy, initiatives and market reactions to those initiatives.
AB Tax-Aware Short Duration Municipal ETF | Credit Risks [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Credit Risk: An issuer or guarantor of a fixed-income security, or the counterparty to a derivatives or other contract, may be unable or unwilling to make timely payments of interest or principal, or to otherwise honor its obligations. The issuer or guarantor may default, causing a loss of the full principal amount of a security and accrued interest. The degree of risk for a particular security may be reflected in its credit rating. There is the possibility that the credit rating of a fixed-income security may be downgraded after purchase, which may adversely affect the value of the security.
AB Tax-Aware Short Duration Municipal ETF | Below Investment Grade Securities Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Below Investment Grade Securities Risk: Investments in fixed-income securities with lower ratings (commonly known as “junk bonds”) are subject to a higher probability that an issuer will default or fail to meet its payment obligations. These securities may be subject to greater price volatility due to such factors as specific municipal or corporate developments and negative performance of the junk bond market generally and may be more difficult to trade than other types of securities.
AB Tax-Aware Short Duration Municipal ETF | Municipal Market Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Municipal Market Risk: This is the risk that special factors may adversely affect the value of municipal securities and have a significant effect on the yield or value of the Fund’s investments in municipal securities. These factors include economic conditions, political or legislative changes, public health crises, uncertainties related to the tax status of municipal securities, and the rights of investors in these securities. To the extent that the Fund invests more of its assets in a particular state’s municipal securities, the Fund may be vulnerable to events adversely affecting that state, including economic, political and regulatory occurrences, court decisions, terrorism, public health crises (including the occurrence of a contagious disease or illness) and catastrophic natural disasters, such as hurricanes, fires or earthquakes. The Fund’s investments in certain municipal securities with principal and interest payments that are made from the revenues of a specific project or facility, and not general tax revenues, may have increased risks. Factors affecting the project or facility, such as local business or economic conditions, could have a significant effect on the project’s ability to make payments of principal and interest on these securities.
In addition, changes in tax rates or the treatment of income from certain types of municipal securities, among other things, could negatively affect the municipal securities markets.
The municipal securities issued by Puerto Rico and its government agencies and municipalities may have more risks than those of other U.S. issuers of municipal securities. Puerto Rico continues to face a challenging economic and fiscal environment. If the general economic situation in Puerto Rico continues to persist or worsens, the volatility and credit quality of Puerto Rican municipal securities could continue to be adversely affected, and the market for such securities may deteriorate further.
AB Tax-Aware Short Duration Municipal ETF | Tax Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Tax Risk: From time to time, the U.S. Government and the U.S. Congress consider changes in federal tax law that could limit or eliminate the federal tax exemption for municipal bond income, which would in effect reduce the income received by shareholders from the Fund by increasing taxes on that income. In such event, the Fund’s net asset value (“NAV”) could also decline as yields on municipal bonds, which are typically lower than those on taxable bonds, would be expected to increase to approximately the yield of comparable taxable bonds. Actions or anticipated actions affecting the tax‑exempt status of municipal bonds could also result in significant shareholder redemptions of Fund shares as investors anticipate adverse effects on the Fund or seek
 
higher yields to offset the potential loss of the tax deduction. As a result, the Fund would be required to maintain higher levels of cash to meet the redemptions, which would negatively affect the Fund’s yield.
AB Tax-Aware Short Duration Municipal ETF | Duration Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Duration Risk: Duration is a measure that relates the expected price volatility of a fixed-income security to changes in interest rates. The duration of a fixed-income security may be shorter than or equal to full maturity of a fixed-income security. Fixed-income securities with longer durations have more risk and will decrease in price as interest rates rise. For example, a fixed-income security with a duration of three years will likely decrease in value by approximately 3% if interest rates increase by 1%.
AB Tax-Aware Short Duration Municipal ETF | Inflation Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Inflation Risk: This is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the Fund’s assets can decline as can the value of the Fund’s distributions. This risk is significantly greater for fixed-income securities with longer maturities.
AB Tax-Aware Short Duration Municipal ETF | Derivatives Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Derivatives Risk: Derivatives may be difficult to price or unwind and may be leveraged so that small changes may produce disproportionate losses for the Fund. A short position in a derivative instrument involves the risk of a theoretically unlimited increase in the value of the underlying asset, reference rate or index, which could cause the Fund to suffer a potentially unlimited loss. Derivatives, especially over‑the‑counter derivatives, are also subject to counterparty risk, which is the risk that the counterparty (the party on the other side of the transaction) on a derivative transaction will be unable or unwilling to honor its contractual obligations to the Fund.
AB Tax-Aware Short Duration Municipal ETF | Variable and Floating Rate Securities Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Variable and Floating-Rate Securities Risk: Variable and floating-rate securities pay interest at rates that are adjusted periodically, according to a specific formula. Because the interest rate is reset only periodically, changes in the interest rate on these securities may lag behind changes in the prevailing market interest rates. The value of the security may rise or fall depending on changes in interest rates between periodic resets.
AB Tax-Aware Short Duration Municipal ETF | When Issued and Forward Commitment Risks [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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When-Issued and Forward Commitment Risks: These securities are purchased before the securities are actually issued or delivered. These securities are subject to the risk that, when delivered, they will be worth less than the agreed-upon purchase price.
AB Tax-Aware Short Duration Municipal ETF | Leverage Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Leverage Risk: To the extent the Fund uses leveraging techniques, such as derivatives, its NAV may be more volatile because leverage tends to exaggerate the effect of changes in interest rates and any increase or decrease in the value of the Fund’s investments.
AB Tax-Aware Short Duration Municipal ETF | Illiquid Investments Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Illiquid Investments Risk: Illiquid investments risk exists when certain investments are or become difficult to purchase or sell. Difficulty in selling such investments may result in sales at disadvantageous prices affecting the value of your investment in the Fund. Causes of illiquid investments risk may include low trading volumes and large positions. Municipal securities may have more illiquid investments risk than other fixed-income securities because they trade less frequently and the market for municipal securities is generally smaller than many other markets.
AB Tax-Aware Short Duration Municipal ETF | ETF Share Price and Net Asset Value Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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ETF Share Price and Net Asset Value Risk: The Fund’s shares are listed for trading on the NYSE Arca, Inc. (the “Exchange”). The Fund’s shares are generally bought and sold in the secondary market at market prices. The NAV per share of the Fund will fluctuate with changes in the market value of the Fund’s holdings. The Fund’s NAV is calculated once per day, at the end of the day. The market price of a share on the Exchange could be higher than the NAV (premium), or lower than the NAV (discount) and may fluctuate during the trading day. When all or a portion of the Fund’s underlying securities trade in a market that is closed when the market for the Fund’s shares is open, there may be differences between the current value of a security and the last quoted price for that security in the closed local market, which could lead to a deviation between the market value of the Fund’s shares and the Fund’s NAV. Disruptions in the creations and redemptions process or the existence of extreme market volatility could result in the Fund’s shares trading above or below NAV. As the Fund may invest in securities traded on foreign exchanges, Fund shares may trade at a larger premium or discount to the Fund’s NAV than shares of other ETFs. In addition, in stressed market conditions, the market for Fund shares may become less liquid in response to deteriorating liquidity in the markets for the Fund’s underlying portfolio holdings.
AB Tax-Aware Short Duration Municipal ETF | Authorized Participant Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Authorized Participant Risk: Only a limited number of financial institutions that enter into an authorized participant relationship with the Fund (“Authorized Participants”) may engage in creation or redemption transactions. If the Fund’s Authorized Participants decide not to create or redeem shares, Fund shares may trade at a larger premium or discount to the Fund’s NAV per share, or the Fund could face trading halts or de‑listing.
AB Tax-Aware Short Duration Municipal ETF | Active Trading Market Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Active Trading Market Risk: There is no guarantee that an active trading market for Fund shares will exist at all times. In times of market stress, markets can suffer erratic or unpredictable trading activity, extraordinary volatility or wide bid/ask spreads, which could cause some market makers and Authorized Participants to reduce their market activity or “step away” from making a market in ETF shares. Market makers and Authorized Participants are not obligated to place or execute purchase and redemption orders. This could cause the Fund’s market price to deviate, materially, from the NAV, and reduce the effectiveness of the ETF arbitrage process. Any absence of an active trading market for Fund shares could lead to a heightened risk that there will be a difference between the market price of a Fund share and the underlying value of the Fund share.
AB Tax-Aware Short Duration Municipal ETF | Management Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Management Risk: The Fund is subject to management risk because it is an actively-managed ETF. The Adviser will apply its investment techniques and risk analyses in making investment decisions, but there is no guarantee that its techniques will produce the intended results. Some of these techniques may incorporate, or rely upon, quantitative models, but there is no guarantee that these models will generate accurate forecasts, reduce risk or otherwise perform as expected.
AB Tax-Aware Short Duration Municipal ETF | AB Tax-Aware Short Duration Municipal ETF  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther none
Management Fees rr_ManagementFeesOverAssets 0.27% [1]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets none
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.27%
After 1 Year rr_ExpenseExampleYear01 $ 28
After 3 Years rr_ExpenseExampleYear03 87
After 5 Years rr_ExpenseExampleYear05 152
After 10 Years rr_ExpenseExampleYear10 $ 343
2014 rr_AnnualReturn2014
2015 rr_AnnualReturn2015
2016 rr_AnnualReturn2016
2017 rr_AnnualReturn2017
2018 rr_AnnualReturn2018
2019 rr_AnnualReturn2019
2020 rr_AnnualReturn2020
2021 rr_AnnualReturn2021
2022 rr_AnnualReturn2022
2023 rr_AnnualReturn2023 4.21%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2023
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 3.51%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2023
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (0.74%)
1 Year rr_AverageAnnualReturnYear01 4.21%
Since Inception rr_AverageAnnualReturnSinceInception 3.70% [2]
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 14, 2022
AB Tax-Aware Short Duration Municipal ETF | Return After Taxes on Distributions | AB Tax-Aware Short Duration Municipal ETF  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 4.00% [3]
Since Inception rr_AverageAnnualReturnSinceInception 3.52% [2],[3]
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 14, 2022 [3]
AB Tax-Aware Short Duration Municipal ETF | Return After Taxes on Distributions and Sale of Fund Shares | AB Tax-Aware Short Duration Municipal ETF  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 3.66% [3]
Since Inception rr_AverageAnnualReturnSinceInception 3.39% [2],[3]
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 14, 2022 [3]
AB Tax-Aware Short Duration Municipal ETF | Bloomberg 1-5 Year Municipal Bond Index  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 3.58%
Since Inception rr_AverageAnnualReturnSinceInception 3.11% [2]
[1]
The Fund’s investment advisory agreement provides that AllianceBernstein L.P. (the “Adviser”) will pay substantially all expenses of the Fund (including expenses of AB Active ETFs, Inc. relating to the Fund), except for the advisory fees, payments under the Fund’s 12b‑1 plan (if any), interest expenses, taxes, acquired fund fees and expenses (other than fees and expenses for funds advised by the Adviser and/or its affiliates), and litigation and extraordinary expenses not incurred in the ordinary course of the Fund’s business. Additionally, the Fund shall be responsible for its non‑operating expenses, including brokerage commissions.
[2]
Inception date is 9/14/22.
[3] After-tax returns: – Are an estimate, which is based on the highest historical individual federal marginal income tax rates, and do not reflect the impact of state and local taxes; actual after-tax returns depend on an individual investor’s tax situation and are likely to differ from those shown; and – Are not relevant to investors who hold Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.