S000083870 [Member] Performance Management - AB International Low Volatility Equity ETF |
Nov. 30, 2025 |
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| Prospectus [Line Items] | |||||||
| Bar Chart and Performance Table [Heading] | BAR CHART AND PERFORMANCE INFORMATION | ||||||
| Performance Narrative [Text Block] | Prior to commencing operations, the Fund acquired the assets and liabilities of AB International Low Volatility Equity Portfolio (the “International Low Volatility Equity Predecessor Fund” or a “Predecessor Fund”), a series of AB Cap Fund, Inc., and adopted the accounting and performance history of that fund (a “Reorganization”), as of the close of business on July 12, 2024. The information shown below for periods prior to the close of business on July 12, 2024 relates to the performance of Advisor Class shares of the International Low Volatility Equity Predecessor Fund. The Fund has the same investment objective, strategies, policies and portfolio management team as the International Low Volatility Equity Predecessor Fund. The performance of the International Low Volatility Equity Predecessor Fund shown below has not been adjusted to reflect the lower fees and expenses that will be incurred by the Fund. The International Low Volatility Equity Predecessor Fund was a mutual fund, and the average annual total returns as shown below are based on NAV per share, and are not based on market prices for an ETF share as traded on an exchange. International Low Volatility Equity Predecessor Fund performance is based on the performance of Advisor Class shares. Prior to the Fund’s acquisition of the International Low Volatility Equity Predecessor Fund, the other share classes of the International Low Volatility Equity Predecessor Fund were converted into Advisor Class shares. The bar chart and performance information provide an indication of the historical risk of an investment in the Fund by showing:
You may obtain updated performance information 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.
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| Performance Past Does Not Indicate Future [Text] | 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] | how the Fund’s performance changed from year to year over ten years; and how the Fund’s average annual returns for one year, five and ten years compare to those of a broad-based securities market index. | ||||||
| Bar Chart Narrative [Text Block] | The annual returns in the bar chart are for the Fund’s shares. For periods prior to the close of business on July 12, 2024, the chart reflects returns of the Advisor Class shares of the International Low Volatility Equity Predecessor Fund, which were reorganized into shares of the Fund in the Reorganization.
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| Bar Chart [Heading] | Bar Chart | ||||||
| Bar Chart Closing [Text Block] | Calendar Year End (%) During the period shown in the bar chart, the Fund’s: Best Quarter was up 13.50%, 2nd quarter, 2020; and Worst Quarter was down -19.84%, 1st quarter, 2020. | ||||||
| Performance Table Heading | Performance Table Average Annual Total Returns (For the periods ended December 31, 2025) | ||||||
| Performance Table Uses Highest Federal Rate | 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 | 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. | ||||||
| Performance Availability Website Address [Text] | www.abfunds.com | ||||||
| Advisor Class | |||||||
| Prospectus [Line Items] | |||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||
| Highest Quarterly Return | 13.50% | ||||||
| Highest Quarterly Return, Date | Jun. 30, 2020 | ||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||
| Lowest Quarterly Return | (19.84%) | ||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 |