v3.26.1
S000082566 [Member] Performance Management - AB Conservative Buffer ETF
Nov. 30, 2025
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] BAR CHART AND PERFORMANCE INFORMATION
Performance Narrative [Text Block]
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 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 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.
Bar Chart Narrative [Text Block]
The annual returns in the bar chart are for the Fund’s shares.
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 3.16%, 1st quarter, 2024; and Worst Quarter was down -1.42%, 1st quarter, 2025.
Performance Table Heading Performance TableAverage 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
AB Conservative Buffer ETF  
Prospectus [Line Items]  
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 3.16%
Highest Quarterly Return, Date Mar. 31, 2024
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (1.42%)
Lowest Quarterly Return, Date Mar. 31, 2025